JPH0932746A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new oil supply means in a pin section for preventing rotation of a fixed scroll which receives minute fluctuation load during the operation in a scroll compressor having a structure in which the fixed scroll can move in the axial direction. SOLUTION: A pin 14 as a rotation prevention means of a fixed scroll 2 is attached to a frame 13 in adjacent to a suction pipe 9 and further in the downstream in the direction of rotation of a crankshaft 6 of the suction pipe 9. Moreover, as another constitution, an oil hole 21 is provided in the frame 13, one end thereof is opened into a discharge chamber 19, and the other end thereof is opened in the vicinity of the pin 14. Furthermore, an oil accumulation section is provided on a bottom of the discharge chamber 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used in commercial and domestic air conditioners.

[0002]

2. Description of the Related Art Conventionally, as a compressor for air conditioning, there are a reciprocating type compressor and a rotary type compressor.
Both methods have been used in the air-conditioning fields for home and business use, and scroll compressors have now been put to practical use by taking advantage of their low noise and low vibration. Currently, they are used by making the most of their respective characteristics in terms of cost and performance. Further, recently, since HCFC-based refrigerants used in conventional home and commercial air conditioners contain substances that destroy the ozone layer, there is a trend toward switching from conventional HCFC-based refrigerants to alternative refrigerants called HFC-based refrigerants.

FIG. 8 shows a vertical sectional view of a scroll compressor used as a conventional air conditioning compressor. Inside the closed casing 1, a compression mechanism portion 4 is formed which compresses the refrigerant gas in the closed space 4a by causing the fixed scroll 2 and the movable scroll 3 to mesh with each other and to make a turning motion.
A bearing component 5 having a thrust bearing portion 5a that supports the movable scroll 3 is welded and fixed to the closed container 1 and is provided on the upper portion. Then, the shaft 3c of the movable scroll 3 is inserted into the eccentric bearing 7 at the end of the crank shaft 6, and the movable scroll 3 is caused to orbit by the crank shaft 6. A rotor 7a of an electric motor 7 is attached to the crankshaft 6, and is disposed below the bearing component 5 together with a stator 7b that is shrink-fitted and fixed to the closed casing 1.

The crankshaft 6 is a main bearing 5b of the bearing component 5.
It is supported by the auxiliary bearing 8. A refrigerant suction pipe 9 is attached to the closed container 1 to introduce the refrigerant into the closed container 1. An oil sump 10a for storing the lubricating oil 10 is provided at the bottom of the closed casing 1 to form a so-called low pressure scroll compressor structure in which suction gas from the suction pipe 9 acts.
Oil is supplied to the main bearing 5b, the eccentric bearing 7, and the thrust bearing portion 5a through the oil hole 6a of the crankshaft 6 by the oil pump 11. The bearing component 5 is provided with a discharge port 5c for discharging the lubricating oil 10 that has lubricated and cooled these bearing portions. Reference numeral 12 is a discharge pipe for discharging the refrigerant gas to the outside of the closed container 1.

FIG. 9 shows a pin for restraining a fixed scroll of a conventional scroll compressor. The fixed scroll 2 is attached to the fitting portion 13a of the frame 113 fastened to the bearing component 5 with bolts on the side opposite to the movable scroll 3 and is inserted into the pin 14 fixed to the frame 113 so that the movement in the rotational direction is restricted and the axial direction. Movement is allowed. Reference numeral 2c denotes a discharge hole provided near the center of the fixed scroll 2 for discharging the compressed gas from the closed space 4a. 13b is frame 1
The through hole is provided near the center of 13 and communicates with the discharge hole 2c. Compressed gas from the discharge hole 2c acts on the back pressure chamber 4b surrounded by the seal material 15 between the frame 113 and the fixed scroll 2, and overcomes the pressure of the refrigerant gas in the closed space 4a to move the fixed scroll 2 to the fixed scroll 2. The refrigerant gas is pressed against the movable scroll 3 side to prevent the refrigerant gas from leaking from the closed space 4a, ensuring the hermeticity and improving the performance. Further, the pressure of the refrigerant gas in the closed space 4a causes a moment to rotate the fixed scroll 2 in the radial direction, but it is restrained by the pin 14. Reference numeral 18 denotes a cover attached to the frame 113, which encloses the frame 113 to form a discharge chamber 19 for storing the discharge gas from the through-hole 13b and is isolated from the suction gas in the closed container 1. The discharge chamber 19 communicates with the discharge pipe 12.
Reference numeral 20 is a well-known Oldham ring for preventing rotation of the movable scroll 3 for causing the movable scroll 3 to orbit with respect to the fixed scroll 2.

With the above structure, the suction gas returns from the suction pipe 9 into the closed container 1 and is sucked into the compression mechanism section 4. By the orbiting movement of the movable scroll 3 with respect to the fixed scroll 2, the suction gas is compressed into a high pressure gas in the closed space 4a and enters the discharge chamber 19 through the discharge hole 2c and the through hole 13b. Then, the gas is discharged from the discharge pipe 12 to the outside of the closed container 1, a refrigerant gas is circulated, a well-known refrigeration cycle (not shown) is configured, and home and commercial air conditioning is performed.

On the other hand, from the oil sump 10a to the oil pump 11
The lubricating oil 10 sucked up by the oil passes through the oil hole 6a of the crankshaft 6, lubricates and cools the main bearing 5b, the eccentric bearing 7, the thrust bearing portion 5a, and the Oldham ring 20, and fixes it from the discharge port 5c. A refueling cycle is formed in which the oil is discharged to the upper portion of the child 7b and returned to the oil sump 10a through the gap between the stator 7b and the closed container 1, that is, the outer peripheral cutout of the stator 7. The oil that lubricates the thrust bearing portion 5a partially flows into the compression mechanism portion 4 together with the suction gas, is contained in the refrigerant gas compressed through the closed space 4a, and is discharged to the discharge chamber 19 to discharge the discharge pipe 1.
It is discharged from No. 2 and circulates through the refrigeration cycle and returns from the suction pipe 9. In the case of a so-called low-pressure scroll compressor in which the suction gas acts in the closed container 1, the lubricating oil 10 contained in the closed space 4a is directly discharged to the outside of the closed container 1 together with the refrigerant gas. Of the heat exchanger (not shown) performance, or because the lubricating oil 10 does not return to the inside of the closed container 1 by accumulating in the refrigerant pipe (not shown) on the way, The discharge amount of the lubricating oil 10, that is, the amount of the lubricating oil 10 contained in the closed space 4a is preferably small. However, if the amount of the lubricating oil 10 contained in the closed space 4a is too small, on the contrary, it cannot serve as a seal for the meshing portion between the fixed scroll 2 and the movable scroll 3, and the leakage of the refrigerant gas increases, resulting in deterioration of performance. It was a cause. Therefore, in the low pressure scroll compressor, the amount of the lubricating oil 10 biting into the closed space 4a must be controlled particularly appropriately.

[0008]

In the case of the conventional scroll compressor described above, the fixed scroll 2 is normally provided with the refrigerant gas in the closed space 4a by the axial (z-axis) force due to the pressure of the refrigerant gas in the back pressure chamber 4b. It overcomes the pressure and is pressed against the movable scroll 3. A moment (around the z axis) that causes the fixed scroll 2 and the movable scroll 3 to rotate by the pressure of the refrigerant gas in the closed space 4a, and a moment that causes the caps to overturn (around the x axis or around the y axis that is orthogonal to the x axis and the z axis). Occurs. The movable scroll 3 is rotationally restrained by a well-known Oldham ring 20, and is axially restrained and supported by a thrust bearing 5a. The fixed scroll 2 is held by the fitting portion 13a and the pin 14 of the frame 113, is allowed to move in the axial direction (z axis), and rotates in the rotational direction (x,
Movement around the y and z axes) is restricted. However, in this case, the pressure of the refrigerant gas in the back pressure chamber 4b and the closed space 4a significantly changes during operation due to the air conditioning load, including transient cases such as start-up, stop, and rotation speed control, Therefore, the above-mentioned rotation moment and overturning moment also change. or,
Fitting portion 13a between the fixed scroll 2 and the frame 113
Also, there is a clearance at the contact portion with the pin 14, and the contact portion between the pin 14 and the fixed scroll 2 is subjected to a repetitive fluctuating load with a very small amplitude, and the pin 14 or the fixed scroll 2 is easily worn. . Moreover, pin 1
It was difficult to provide a configuration in which the lubricating oil 10 of the oil sump 10a was supplied to the vicinity of No. 4, and the oil supply tended to be insufficient, and the pin 14 or the hole 2d of the fixed scroll 2 was easily worn. Furthermore, the refrigerant for the air conditioner is the conventional HCFC refrigerant (R-22
Etc., the ozone depletion coefficient (commonly known as ODP value) is zero.
FC alternative refrigerant (for example, R-32, R-134a, R
-125, single component such as R-143a or their 2
If more than one kind of mixed components) is used, chlorine (C
Since it does not contain the l) component, conventionally, due to the effect of this chlorine content, a sliding film was formed even in a minute fluctuation sliding part and durability was maintained, but in the HFC alternative refrigerant, the chlorine content Since it is not included, it is disadvantageous in terms of sliding lubrication, and there is a problem of seizure in the pin 14 and the hole 2d. The lubricating oil 10
In the case of HCFC refrigerants, H is the current base oil
Although an alkylbenzene that is soluble with a CFC-based refrigerant is used, the HFC-based refrigerant is not compatible with conventional lubricating oils and has many problems, so that an ester-based refrigerant is appropriate.

The present invention solves the above-mentioned conventional problems. In a scroll compressor having a structure in which a fixed scroll is movable in the axial direction, a highly durable and inexpensive means for preventing rotation of the fixed scroll. To provide.

[0010]

The present invention has been invented to solve the above problems, and its gist is to form a fixed scroll and a movable scroll in an airtight container by meshing with each other. A compression mechanism portion having a closed space is provided, a suction pipe for guiding suction gas into the closed container is attached to the closed container, a discharge chamber for storing the refrigerant gas discharged from the compression mechanism portion, and a discharge pipe communicating with the discharge chamber, A bearing component that has a thrust bearing that supports the movable scroll, insert the movable scroll into the eccentric bearing of the crankshaft, hold this crankshaft with the main bearing of the bearing component, and attach the frame to the bearing component with bolts and fix it The scroll is sandwiched and an oil sump is constructed at the bottom of the closed container, and the pin fixed to the frame regulates the rotation of the fixed scroll, allowing axial movement. While pressing the fixed scroll to the movable scroll-side, in the scroll compressor pivoting movement of the movable scroll against the fixed scroll, there the mounting position of the frame of the pin that is disposed adjacent the suction pipe side.

As another structure, the mounting position of the pin to the frame is adjacent to the suction pipe side and is arranged downstream of the position of the suction pipe in the rotation direction of the crankshaft.

As another structure, a compression mechanism portion having a closed space formed by meshing a fixed scroll and a movable scroll with each other is provided in the closed container, and a suction pipe for guiding intake gas into the closed container is provided in the closed container. Installation, discharge chamber that stores the refrigerant gas discharged from the compression mechanism part,
Insert the discharge pipe communicating with the discharge chamber, the bearing part having the thrust bearing part that supports the movable scroll, the movable scroll into the eccentric bearing of the crankshaft, hold the crankshaft with the main bearing of the bearing part, and bolt the frame. The fixed scroll is attached to the bearing parts by using such as to sandwich the fixed scroll, and an oil sump is configured at the bottom of the closed container.The fixed scroll is restricted by the pin fixed to the frame and the fixed scroll is allowed to move in the axial direction. While pressing it to the side,
In a scroll compressor that orbits a movable scroll with respect to a fixed scroll, an oil hole is provided in a frame,
One end is opened to the discharge chamber, and the other end is opened to the vicinity of the pin.

As another configuration, an oil sump is provided at the bottom of the discharge chamber, and one end of the oil hole of the frame is opened in the oil sump and the other end is opened near the pin.

As still another configuration, the discharge pipe is arranged higher than the bottom of the discharge chamber, and one end of the oil hole of the frame is opened in the discharge chamber and the other end is opened near the pin.

As yet another configuration, the pin is made of a sintered material, and one end of the oil hole of the frame is opened in the discharge chamber and the other end is opened in the vicinity of the pin.

[0016]

With the above construction of the present invention, during operation, the fixed scroll overcomes the pressure of the refrigerant gas in the closed space and is pressed against the movable scroll side by the axial force due to the pressure of the refrigerant gas in the back pressure chamber, and at the same time the closed space is closed. Due to the pressure of the refrigerant gas inside, a moment for rotating the fixed scroll and the movable scroll in the radial direction and a moment for overturning are generated. In this case, the pressure of the refrigerant gas in the back pressure chamber and the closed space fluctuates during operation, the above-described rotation moment and overturning moment also fluctuate, and the pin is subjected to repeated fluctuating load of small displacement. However, as in the above configuration of the present invention, the position where the pin is attached to the frame is arranged adjacent to the suction pipe side, and the suction gas returned from the suction pipe is sucked into the compression mechanism portion, Lubricating oil with a low temperature contained in itself and inhaled gas easily hits the pin directly,
Lubricant adheres to the pins.

According to another structure of the present invention, the mounting position of the pin to the frame is adjacent to the suction pipe side and is arranged downstream of the position of the suction pipe in the rotation direction of the crankshaft.
During the process in which the low temperature lubricating oil contained in the suction gas returning from the suction pipe during operation is sucked into the compression mechanism,
The flow of the suction gas in the airtight container makes it easier to directly hit the pin, and the lubricating oil adheres to the pin.

According to another structure of the present invention, an oil hole is provided in the frame, one end is opened to the discharge chamber, and the other end is opened near the pin. Since the refrigerant gas in the closed space contains some lubricating oil, the high-pressure gas discharged from the compression mechanism contains lubricating oil, and the cover and the bottom of the discharge chamber are in the discharge chamber that stores the high-pressure refrigerant gas. Lubricating oil that adheres to the bottom of the tank accumulates at the bottom. This lubricating oil flows to the vicinity of the pin through the oil hole of the frame due to the pressure difference between the high pressure inside the discharge chamber and the low pressure near the pin, and the lubricating oil adheres to the contact portion.

According to another structure of the present invention, an oil sump is provided at the bottom of the discharge chamber, and one end of the oil hole of the frame is opened in this oil sump and the other end is opened in the vicinity of the pin so that the discharge chamber is closed. Lubricating oil contained in the high-pressure gas is stored in the cover and the oil reservoir, and the lubricating oil more reliably flows through the oil hole of the frame to the pin portion.

Further, according to another structure of the present invention, the discharge pipe communicating with the discharge chamber is arranged higher than the bottom of the discharge chamber, and the bottom of the discharge chamber serves as an oil reservoir, and one end of the oil hole of the frame opens in the discharge chamber. However, the other end is opened near the pin, and the high pressure gas is discharged from the discharge pipe to the outside of the closed container in the discharge chamber, but the lubricating oil contained in the high pressure gas adheres to the cover and the bottom of the discharge chamber and discharges. Store at the bottom of the chamber. Due to the pressure difference in the discharge chamber and the pressure in the vicinity of the pin, the lubricating oil flows around the pin through the oil hole of the frame and is supplied to the contact portion between the fixed scroll and the pin.

Further, according to another structure of the present invention, one end of the oil hole of the frame is opened in the discharge chamber and the other end is opened in the vicinity of the pin, and the high pressure gas in the discharge chamber is formed by using the pin as a sintered material. The lubricating oil contained in the oil flows into the periphery of the pin through the oil holes in the frame, and because the inside of the pin of the sintered material is in fine cavity communication, the lubricating oil enters due to the pressure difference and lubricates the contact part between the pin and the fixed scroll. The oil begins to seep.

[0022]

An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 is a longitudinal sectional view of a scroll compressor showing an embodiment of the present invention, FIG. 2 is a transverse sectional view of a scroll compressor showing another embodiment of the present invention, and FIGS. 3 to 7 are different books. It is a longitudinal section of a compression mechanism part showing one example of the invention. FIG. 7 is an enlarged sectional view of the pin in FIG. Figure 1
Since the scroll compressor of the present invention shown in FIG. 6 has substantially the same components as those of the conventional scroll compressor shown in FIG. 8, the same functional components are designated by the same reference numerals. The basic operation of FIG. 1 is almost the same as that of the conventional scroll compressor of FIG. 8 described in the section of the prior art. That is, the suction refrigerant gas is taken into the compression mechanism portion 4 from the suction pipe 9, and the refrigerant gas is compressed in the closed space 4a to pass through the discharge hole 2c, the through hole 13b and the discharge chamber 19 and then the discharge pipe 12 to the outside of the closed container 1. To the refrigeration cycle for discharging to the lubricating oil 10 of the oil sump 10a (whether the suction refrigerant is an HCFC refrigerant or H
Appropriate lubricating oil composition changes depending on whether it is FC type refrigerant,
Since they are functionally similar, the same numbers are assigned and no distinction is made. ) Is sucked up by the oil pump 11 and passes through the oil hole 6a to lubricate the main bearing 5b, the eccentric bearing 7, the thrust bearing portion 5a, and the Oldham ring 20, and to return from the discharge port 5c to the oil sump 10a again. It is almost the same.

An embodiment of the invention claim 1 is shown in FIGS. In FIGS. 1 and 2, the structural difference from the conventional example is that the mounting position of the pin 14 to the frame 13 is arranged adjacent to the suction pipe 9 side. During operation, the fixed scroll 2 overcomes the pressure of the refrigerant gas in the closed space 4a by the axial force due to the pressure of the refrigerant gas in the back pressure chamber 4b to press the fixed scroll 2 toward the movable scroll 3 side, and at the same time the closed space is closed. Due to the pressure of the refrigerant gas in 4a, a moment that causes the fixed scroll 2 and the movable scroll 3 to rotate and a moment that causes the caps to overturn are generated.
The orbiting scroll 3 is constrained by a well-known Oldham ring 20 and is axially constrained and supported by a thrust bearing portion 5a, but the fixed scroll 2 is attached to a fitting portion 13a of a frame 13 and a hole portion 2d is inserted into a pin 14. Therefore, the movement in the axial direction is allowed, and the movement in the rotation direction and the overturning are restricted. In this case, the pressure of the refrigerant gas in the back pressure chamber 4b and the closed space 4a fluctuates during the operation including the transition at the time of starting, stopping, and changing the rotation speed, and the above-mentioned rotation moment and overturning moment are also generated. fluctuate. In addition, Frame 1
There is a slight gap in the fitting portion 13a of 3 and the contact portion between the pin 14 and the hole 2, and therefore the pin 14 is subjected to repeated variable load of small displacement. Since the mounting position of the pin 14 to the frame 13 is arranged adjacent to the suction pipe 9 as in the configuration of the present invention, a process in which the suction gas returning from the suction pipe 9 is sucked into the compression mechanism portion 4 Thus, the low temperature lubricating oil 10 contained in the intake gas as well as the intake gas easily hits the pin 14 directly, so that the pin 14 and the fixed scroll 3
Even if a severe repeated fluctuating load is applied to the contact portion with the hole 2d, the preferable lubrication state is secured.

Another invention An embodiment of claim 2 is shown in FIGS. 1 and 2. The difference in the configuration from the conventional example is the pin 14
The position of attachment to the frame 13 is adjacent to the suction pipe 9 side, and is disposed downstream of the position of the suction pipe 9 in the rotation direction of the crankshaft 6. During the process in which the low temperature lubricating oil 10 contained in the suction gas returning from the suction pipe 9 during operation is sucked into the compression mechanism portion 4, the suction refrigerant gas flow in the hermetic container 1 causes the lubricating oil 10 to flow more directly to the pin 14. It easily hits and the lubricating oil 10 adheres. Therefore, the contact portion with the hole 2d of the fixed scroll 3 is brought into a preferable lubrication state, and an inexpensive rotation preventing means of the fixed scroll 3 with more ensured durability is realized.

As another embodiment of claim 3 of the present invention, FIG.
Shown in The structural difference from the conventional example is that an oil hole 21 is provided in the frame 13, one end is opened to the discharge chamber 19, and the other end is opened in the vicinity of the pin 14. If the diameter of the oil hole 21 is too large, the amount of oil flowing will increase due to the pressure difference between the open ends, the discharge chamber 19 side and the pin 14 side, and leakage loss will occur. I have to. Since the refrigerant in the closed space 4a contains the lubricating oil 10, the high-pressure gas discharged from the compression mechanism unit 4 also contains the lubricating oil 10, and the high-pressure gas is covered in the discharge chamber 19 that stores the high-pressure gas. The lubricating oil 10 adhering to 18 and the discharge chamber 19 is stored in the bottom portion 22. This lubricating oil 10 causes the refrigerant pressure in the discharge chamber 19 and the pin 1
4 due to the difference between the pressure and the pressure in the vicinity of 4, the oil flows through the oil hole 21 of the frame 13 to the vicinity of the pin 14 and is in a good lubricating state.
Even if a severe repeated fluctuating load is applied, a rotation preventing means that ensures durability at the contact portion between the pin 14 and the hole 2d of the fixed scroll 2 is realized.

FIG. 4 shows another embodiment of claim 4 of the present invention. The difference in structure from the conventional example is the discharge chamber 1.
9. Bottom 22 of 9, i.e. anti-fixed scroll 2 of frame 13
A recessed oil sump 23 is provided on the side, and one end of the oil hole 21 of the frame 13 is opened to this oil sump 23 and the other end is pin 1
That is, it is opened in the vicinity of 4. In the discharge chamber 19, the lubricating oil 10 contained in the high-pressure gas from the compression mechanism portion 4 adheres to the cover 18 and the bottom portion 22 and is stored in the oil sump portion 23, so that the pressure difference between the both ends of the oil hole 21 can be ensured. The lubricating oil 10 flows to the pin 14 through the oil hole 21 of the frame 13, and a better sliding state can be realized at the contact portion between the pin 14 and the fixed scroll 2.

FIG. 5 shows another embodiment of claim 5 of the present invention. The difference from the configuration of the conventional example is that the discharge pipe 9 that is electrically connected to the discharge chamber 19 is located at the bottom portion 22 of the discharge chamber 19.
The bottom portion 22 of the discharge chamber 19 serves as an oil reservoir 23, and the oil hole 21 of the frame 13 has one end open to the discharge chamber 19 and the other end near the pin 14. . The high-pressure gas is discharged from the discharge pipe 9 to the outside of the closed container 1 in the discharge chamber 19, but the lubricating oil 10 contained in the high-pressure gas adheres to the cover 18 and the bottom 22 and is stored in the bottom 22 of the discharge chamber 19. The pressure difference between the ends of the oil hole 21 causes the lubricating oil to flow around the pin 14 through the oil hole 21 of the frame 13, and a good lubrication state can be realized.

Another embodiment of claim 6 is shown in FIGS. 6 and 7. The difference in structure from the conventional example is pin 1
4 is a sintered material, one end of the oil hole 21 of the frame 13 is opened to the discharge chamber 19, and the other end is opened to the vicinity of the pin 14. The lubricating oil 10 contained in the high-pressure gas discharged from the compression mechanism portion 4 adheres to the cover 18 and the bottom portion 22 in the discharge chamber 19 and adheres to the bottom portion 2 of the discharge chamber 19.
2, the lubricating oil 10 flows through the oil hole 21 of the frame 13 to the pin 14 due to the differential pressure, and the inside of the pin 14 of the sintered material is communicated in a minute cavity, so the lubricating oil 10 enters there. Since the lubricating oil 10 exudes at the contact portion with the fixed scroll 2 and is retained inside the pin 14, the lubricating property is maintained and the slidability is secured for a long period during a transition or during operation. It will be.

In particular, when the refrigerant used in the closed container 1 is changed from the conventional HCFC refrigerant to the HFC alternative refrigerant, the HFC refrigerant does not contain chlorine Cl content, which is disadvantageous in terms of sliding lubrication. However, the above effect is more remarkably exhibited as compared with the case where the HCFC refrigerant is used.

[0030]

As is apparent from the above description, claim 1
According to the invention, a compression mechanism portion having a closed space formed by meshing a fixed scroll and a movable scroll with each other is provided in the closed container, and a suction pipe for guiding intake gas into the closed container is attached to the closed container, and the compression mechanism is provided. A discharge chamber that stores the refrigerant gas discharged from the discharge chamber, a discharge pipe that is connected to this discharge chamber and is attached to a closed container, a bearing component that has a thrust bearing portion that supports the movable scroll, and an eccentric bearing for the crankshaft of the movable scroll. The main bearing of the bearing component to hold this crankshaft, and the frame that holds the fixed scroll is attached to the bearing component, an oil sump is formed at the bottom of the closed container, and the pin inserted into the frame is used to fix the fixed scroll. The movable scroll is fixed while pressing the fixed scroll toward the movable scroll by restricting rotation and allowing axial movement. In a scroll compressor that makes a swirling motion with respect to rolls, the pin mounting position on the frame is located adjacent to the suction pipe side, so the lubrication at low temperature contained in the suction gas returning from the suction pipe The oil easily hits the pin directly, the lubricity is improved at the contact portion between the pin and the fixed scroll to which a severe repeated variable load is applied, and therefore the sliding durability is secured.

According to the second aspect of the present invention, since the pin is attached to the frame at a position adjacent to the suction pipe side and downstream from the position of the suction pipe in the rotation direction of the crankshaft, the pin is attached during operation. The low-temperature lubricating oil contained in the suction gas returning from the suction pipe is more likely to directly hit the pin due to the flow of the suction gas in the closed container, further improving the lubricity at the contact portion between the pin and the fixed scroll. The rotation preventing means of the fixed scroll, which is ensured and more durable, is realized.

According to the invention of claim 3, in the scroll compressor for pressing the fixed scroll in the direction of the movable scroll, an oil hole is provided in the frame, one end is opened to the discharge chamber, and the other end is opened near the pin. Therefore, a part of the lubricating oil contained in the high pressure gas discharged from the compression mechanism part is stored in the bottom part of the discharge chamber, and this lubricating oil is supplied to the vicinity of the pin part through the oil hole of the frame, and good sliding lubrication is achieved. Thus, the inexpensive fixed scroll autorotation preventing means, in which durability is ensured at the contact portion between the pin and the fixed scroll, is realized.

Further, according to the invention of claim 4, the oil reservoir is provided at the bottom of the discharge chamber, and one end of the oil hole of the frame is opened in the oil reservoir and the other end is opened in the vicinity of the pin.
Lubricating oil contained in the high-pressure gas is stored in the oil reservoir in the discharge chamber, and more lubricating oil is more reliably supplied to the pin through the oil hole of the frame, and at the contact portion between the pin and the fixed scroll. A more favorable and reliable sliding lubrication state is achieved, and a highly reliable rotation preventing means of the fixed scroll can be realized.

Further, according to the invention of claim 5, the discharge pipe communicating with the discharge chamber is arranged higher than the bottom of the discharge chamber, and one end of the oil hole of the frame is opened in the discharge chamber and the other end is near the pin. Since it is open, the bottom of the discharge chamber serves as an oil reservoir, and the high pressure gas is discharged from the discharge pipe to the outside of the closed container in the discharge chamber, but the lubricating oil contained in the high pressure gas is stored at the bottom of the discharge chamber and The lubricating oil will flow around the pin through the oil hole, and a good lubricating state will be achieved, and a highly durable fixed rotation preventing means of the fixed scroll can be realized.

Further, according to the invention of claim 6, the pin is made of a sintered material, and one end of the oil hole of the frame is opened in the discharge chamber and the other end is opened in the vicinity of the pin, so that the high pressure gas is discharged in the discharge chamber. The lubricating oil contained in the oil flows into the pins through the oil holes in the frame, and the inside of the pin of the sintered material communicates finely with the cavities, so the lubricating oil enters there and lubricates the contact parts of the fixed scroll. Since the oil oozes out and the lubricating oil is retained inside the pin, the lubricity is retained for a long period of time, and the rotation preventing means of the fixed scroll with the durability ensured can be realized.

The same can be said in common in these inventions, when an HFC-based alternative refrigerant containing no chlorine component (Cl) from the conventional HCFC-based refrigerant such as R-22 is used in this scroll compressor. In the above, the lubricating effect is remarkably exhibited.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of a scroll compressor showing another embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part of a compression mechanism part showing another embodiment of the present invention.

FIG. 4 is a vertical sectional view of the main part

FIG. 5 is a longitudinal sectional view of the main part

FIG. 6 is a longitudinal sectional view of the main part

FIG. 7 is an enlarged cross-sectional view of a pin showing another embodiment of the present invention.

FIG. 8 is a longitudinal sectional view of a conventional scroll compressor.

FIG. 9 is a sectional view of a pin of a conventional scroll compressor.

[Explanation of symbols]

 1 Closed Container 2 Fixed Scroll 3 Movable Scroll 4 Compression Mechanism 4a Sealed Space 5 Bearing Parts 5a Thrust Bearing 5b Main Bearing 5c Discharge Port 6 Crankshaft 6a Oil Hole 7 Main Bearing 7b Stator 9 Suction Pipe 10 Lubricating Oil 10a Oil Reservoir 11 Oil Pump 12 Discharge Pipe 13 Frame 14 Pin 18 Cover 19 Discharge Chamber 20 Oldham Ring 21 Oil Hole 22 Bottom 23 Oil Sump

Claims (6)

[Claims] 1. A compression mechanism portion having a closed space formed by meshing a fixed scroll and a movable scroll with each other in a closed container, a suction pipe attached to the closed container to introduce suction gas into the closed container, and the compression unit. A discharge chamber that stores the refrigerant gas discharged from the mechanism portion, a discharge pipe that is connected to the discharge chamber and is attached to the closed container, a bearing component having a thrust bearing portion that supports the movable scroll, and the movable scroll that has a crankshaft bias. Oil that lubricates the main bearing of the bearing component that is inserted into the core bearing and holds the crankshaft, the frame that is attached to the bearing component and that sandwiches the fixed scroll, the main bearing, the eccentric bearing, and the thrust bearing portion is stored. Constitutes an oil sump at the bottom of the closed container,
The rotation of the fixed scroll is restricted by a pin fixed to the frame, the movement in the axial direction is allowed, the fixed scroll is pressed against the movable scroll, and the movable scroll is rotated with respect to the fixed scroll. In the scroll compressor, the scroll compressor is characterized in that the attachment position of the pin to the frame is arranged adjacent to the suction pipe side. 2. The scroll compressor according to claim 1, wherein the pin is attached to the frame at a position downstream of the position of the suction pipe in the rotation direction of the crankshaft. 3. A compression mechanism section having a closed space formed by meshing a fixed scroll and a movable scroll with each other in a closed container, a suction pipe attached to the closed container for guiding intake gas into the closed container, and the compression unit. A discharge chamber that stores the refrigerant gas discharged from the mechanism portion, a discharge pipe that is connected to the discharge chamber and is attached to the closed container, a bearing component having a thrust bearing portion that supports the movable scroll, and the movable scroll that has a crankshaft bias. Oil that lubricates the main bearing of the bearing component that is inserted into the core bearing and holds the crankshaft, the frame that is attached to the bearing component and that sandwiches the fixed scroll, the main bearing, the eccentric bearing, and the thrust bearing portion is stored. Constitutes an oil sump at the bottom of the closed container,
The rotation of the fixed scroll is restricted by a pin fixed to the frame, the movement in the axial direction is allowed, the fixed scroll is pressed against the movable scroll, and the movable scroll is rotated with respect to the fixed scroll. In this scroll compressor, an oil hole is provided in the frame, one end is opened to the discharge chamber, and the other end is opened near the pin. 4. The scroll compressor according to claim 3, wherein an oil sump portion is provided at the bottom of the discharge chamber, and one end of the oil hole of the frame is opened to the oil sump portion. 5. The scroll compressor according to claim 3, wherein the discharge pipe is arranged higher than the bottom of the discharge chamber. 6. The scroll compressor according to claim 3, wherein the pin is made of a sintered material.