JPH0363677B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an oil-fed closed scroll fluid machine used as a refrigerant compressor or an air compressor for refrigeration and air conditioning, refrigerators, etc.

[Prior art]

Taking a refrigerating and air conditioning compressor as an example of an oil-supplied scroll fluid machine, its basic structure, lubrication method, etc. will be explained with reference to FIGS. 1 to 8. In addition,
To facilitate explanation, solid line arrows indicating the flow direction of working gas and broken line arrows indicating the flow direction of lubricating oil are included in each figure. FIG. 1 shows an example of the structure of a vertical compressor which is a closed type and has a scroll compression element section at the upper part of the main body and an electric motor section at the lower part of the main body.

FIG. 1 shows the overall structure of a conventional hermetic scroll compressor for air conditioners. The compressor includes both scroll members, a fixed scroll 1 and an orbiting scroll 2, which are compression element parts, an anti-rotation member 3 and a main shaft 6 that prevent rotation of the orbiting scroll 2, and three bearings that support the rotation, namely, Slewing bearing 12 and main bearing 11
and auxiliary bearing 10, electric motor 9, fixed scroll 1
It consists of a stationary member 4 (hereinafter referred to as a "frame") that fixes the This is an example of a high-pressure chamber type structure in an atmosphere of (pressure).

The operation of the compressor will be explained according to the flow of refrigerant gas and the flow of lubricating oil.

The low-temperature, low-pressure refrigerant gas is guided from the suction pipe 19 and reaches the suction chamber 1f in the fixed scroll 1. As shown in FIG. 2, the refrigerant gas that has reached the compression element moves into the closed spaces 5a, 5 formed by both scrolls due to the orbital movement of the orbiting scroll, which is prevented from rotating.
As the refrigerant gas gradually shrinks and moves to the center of the scroll, the pressure of the refrigerant gas increases and it is discharged from the central discharge hole 1d. The discharged high-temperature, high-pressure refrigerant gas fills the space 17 around the electric motor via the upper space 16 in the closed container 1 and the passages 13 and 14, and is guided to the outside via the discharge pipe 20.
(This high discharge pressure is indicated by the symbol Pd.) On the other hand, a space 18 surrounded by the back surface of the orbiting scroll 2 and the frame 4 (this is referred to as a "back pressure chamber")
To counter the gas force in the thrust direction due to the gas pressure in the plurality of sealed spaces formed by both the orbiting and fixed scrolls (this force becomes a separation force that tries to push the orbiting scroll 2 downward). Therefore, a pressure (indicated by the symbol Pm) between the suction pressure (low pressure side pressure) and the discharge pressure acts. The setting of this intermediate pressure is carried out through the pores 2 in the end plate 2a of the orbiting scroll 2.
c and 2d are provided, and the gas inside the scroll during compression is introduced into the back pressure chamber 18 through these pores, and gas force is applied to the back surface of the orbiting scroll. How to apply this intermediate pressure is disclosed in JP-A-53-119412 and JP-A-55-37520, so a detailed explanation will be omitted.

Next, the detailed structure of the anti-rotation member 3 is shown in FIGS. 3 and 4. An example of the anti-rotation member 3 configured with an Oldham ring 30 and Oldham keys 31 and 32 is illustrated. This Oldham ring 30 is
Oldham keys 31a, 31b32 are sandwiched between the orbiting scroll 2 and the frame 4 (strictly speaking, the key pedestal 4a of the frame part), and are provided respectively.
It reciprocates on a and 32b to prevent the orbiting scroll 2 from rotating. Therefore, the Oldham ring is sliding at four locations 33, 34, 35, and 36.

With reference to FIGS. 5 to 7, orbiting scroll 2
The structure around the outer peripheral portion 2f of the end plate will be explained. The head plate thickness of the head plate part 2a of the orbiting scroll 2 has a uniform thickness regardless of the head plate outer peripheral part 2f and the head plate central part 2j (in FIG. 6, this head plate thickness is indicated by the dimension Hs). Further, the outer peripheral portion 2f of the end plate of the orbiting scroll 2 is sandwiched between the outer peripheral portion 1c of the end plate of the fixed scroll 1 and the pedestal 4b of the frame 4 with a small gap being maintained. In the case of FIG. 6, the minute gap is expressed as (Hf-Hs). (Here, Hf: the dimension between the frame top surface 4c and the surface of the pedestal 4b) A radial oil supply path 40 is provided in the end plate portion 2a of the orbiting scroll 2.
(for example, 40a, 40b, etc.) and oil supply holes 41 (for example, 41a, 41b, etc.). These oil supply holes 41 engage with oil grooves 42 provided in the end plate portion 1a of the fixed scroll 1. Orbital scroll 2
is a rotating motion around the frame center point (or the fixed scroll center point) Of with the end plate outer circumference 2f being sandwiched between the end plate outer circumference 1c of the fixed scroll 1 and the pedestal 4b of the frame 4. The positional relationship between the frame 4 and the orbiting scroll 2 is as shown in FIG. FIG. 7 shows a cross-sectional view of the frame 4. The frame 4 is provided with two key pedestals 4a each having a key groove 4f for attaching an Oldham key. 4e is a bolt hole for attaching the fixed scroll 1. In this way, around the end plate outer peripheral part 2f of the orbiting scroll 2, in addition to the back pressure chamber 18 at the back of the orbiting scroll, the end plate outer peripheral part 2f, the end plate outer peripheral part 1c of the fixed scroll opposing thereto, and the frame 4 are arranged. A space 43 is formed. Hereinafter, the space 43 will be referred to as a "frame room".
It is called.

FIG. 8 shows the discharge chamber 16 which is the upper space of the fixed scroll 1 and the motor chamber 1 which is the space around the electric motor 9.
7 shows details of communication paths 13 and 14 that communicate with each other. The communication passages 13 and 14 are provided at the outer edges of the fixed scroll 1 and the frame 4, and have a rectangular cross-sectional shape.

Note that the structure in which the outer circumferential portion 2f of the end plate of the orbiting scroll is sandwiched between the stationary member 1c and the frame 4 while maintaining a small gap is disclosed in Japanese Patent Application Laid-Open No. 142902/1981, so the purpose of the structure is A description of the effects etc. will be omitted. 8 and 24 are balance weights, which are balancing components for canceling out the centrifugal force acting on the orbiting scroll 2;
It swings around the main shaft 6.

Next, the flow of lubricating oil will be explained using FIG. 1, FIG. 5, and FIG. 6.

The lubricating oil 7 is stored in the lower part of the closed container 23.
The lower end of the main shaft 6 is immersed in the oil at the bottom of the container, and the upper part of the main shaft is provided with an eccentric shaft portion 6a. It is connected. The shaft 6 has an eccentric vertical hole 6b for supplying oil to each bearing part.
is formed from the lower end of the spindle to the upper end surface of the spindle. An orbiting scroll boss portion 2 is provided at the lower part of the eccentric shaft portion 6a.
A balance weight 8 is formed integrally with the main shaft 6 on the upper part of the main bearing facing the tip end surface of the main shaft 6. The lower end of the main shaft 6 immersed in the lubricating oil 7 is in an atmosphere of high discharge pressure Pd, while the area around the downstream swing bearing 12 is in an atmosphere of intermediate pressure Pm, so there is a pressure difference of (Pd - Pm). As a result, the lubricating oil 7 at the bottom of the container rises inside the eccentric vertical hole 6b.
Further, due to the rotation of the main shaft 6, centrifugal force acts on the oil in the eccentric vertical hole 6b, further increasing the amount of oil supplied to each bearing portion. In this way, each bearing is supplied with oil by the eccentric hole oiling method and the differential pressure oiling method. The lubricating oil 7 that has risen inside the eccentric vertical hole 6b is
The auxiliary bearing 10 and the main bearing 11 are supplied with oil, and the upper space 25 of the eccentric shaft portion 6a (a gap between the bottom surface of the boss portion of the orbiting scroll boss portion 2e and the upper end surface of the eccentric shaft portion 6a; this space is a hydraulic chamber). becomes.

Hereinafter, it will be referred to as the "hydraulic chamber" 25. ). The lubricating oil in the hydraulic chamber 25 has a pressure approximately equal to the discharge pressure Pd, and as shown in FIGS. 5 and 6, the radial oil supply passage 4 provided in the end plate 2a of the orbiting scroll 2
0 and an oil supply hole 41 to reach an oil groove 42 provided in the outer circumferential portion 1c of the end plate of the fixed scroll. Oil groove 42
The lubricating oil that has reached this level is sent to the frame chamber 43 or
It reaches the suction chamber 1f inside the scroll. Further, the lubricating oil that has reached the swing bearing 12 and the main shaft 11 is drained into the back pressure chamber 18 through the respective bearing gaps. The lubricating oil that has reached the back pressure chamber 18 is transferred to the Oldham ring section 3.
After lubricating the refrigerant gas, the refrigerant gas is injected into the working chamber formed by the scrolls 1 and 2 through the pores 2c and 2d, and then mixed with the refrigerant gas inside the scroll lap. Next, the lubricating oil along with the refrigerant gas is subjected to a pressure increasing action, and the discharge hole 1d and the discharge chamber 1
6 further moves to the motor room 17 via passages 13 and 14. The lubricating oil that has reached the motor chamber 17 has a large flow rate due to the large space, and falls to the bottom of the container due to its own weight. That is, the refrigerant gas and lubricating oil are separated in the motor room 17. The fallen lubricating oil is collected again at the bottom of the container and used to lubricate each part.

Next, problems with the prior art will be explained with reference to FIGS. 9 and 10.

FIG. 9 shows how oil and refrigerant gas are separated in the discharge chamber 16 in the prior art. The oil (oil droplets) 7c separated from the refrigerant gas in the discharge chamber 16 accumulates on the outer edge of the end plate of the fixed scroll 1, and this situation is also shown in FIG. 9 as oil sump situations 7d and 7e. As shown in FIG. 9, the oil 7 separated from the refrigerant gas in the discharge chamber 16 temporarily accumulates at the upper part of the outer edge of the end plate of the fixed scroll, but eventually it does not stay in that area but flows into the discharge chamber 16. The refrigerant gas is mixed with the refrigerant gas and moved to the lower motor room 17 through communication passages 13 and 14 communicating with the motor room 17. Therefore, in the scroll compressor of the prior art, the discharge chamber 16, which is the upper space of the fixed scroll 1, does not have an oil separation effect as a result. This results in a machine with poor oil separation efficiency for the closed container as a whole.

FIG. 10 shows the flow of refrigerant gas and oil particles 7c passing through the communication passages 13 and 14 that communicate the discharge chamber 16 and the motor chamber 17. As explained above regarding the flow of lubricating oil, a mixture of refrigerant gas and oil flows through the communication passages 13 and 14, and pressure loss occurs in this portion. This pressure loss is determined by the amount of lubricating oil mixed with the refrigerant gas (passing oil amount) and the passage length.
It increases in proportion to L ₁ mag.

In addition, the sliding parts (for example, the oil grooves 4
2) is supplied to the end plate portion 2a of the orbiting scroll 2.
The oil is supplied through radial oil supply passages 40 and oil supply holes 41, and there is also a workability problem in that it is difficult to process the oil supply passages 40.

[Purpose of the invention]

The present invention was invented in view of the above-mentioned problems, and it solves the problem of reducing the oil separation efficiency of the closed container associated with the prior art, and increasing the pressure loss of the discharge pressure. The purpose of this project is to solve problems related to the workability of channels and provide a scroll fluid machine with higher performance and reliability than conventional machines.

[Summary of the invention]

A closed scroll fluid machine according to the present invention for achieving the above object has a scroll compression element section and a motor section connected to each other via a rotating shaft supported on a frame and housed in a closed container. The inside of the casing section is divided into an upper discharge chamber and a lower motor chamber, and the scroll compression element section has a fixed scroll and an orbiting scroll, each of which has a spiral wrap standing upright on a disc-shaped end plate, and which are engaged with each other with the wrap inside. The orbiting scroll is connected by a bearing to an eccentric shaft connected to the rotating shaft, and the orbiting scroll is rotated without rotating relative to the fixed scroll, and the fixed scroll has a discharge hole that opens in the center and an outlet hole that opens on the outer circumference. A suction port is provided, gas is sucked in from the suction port, the gas is compressed by reducing the volume by moving around the compression space formed by both scrolls, and the compressed gas is discharged from the discharge hole into the discharge chamber. In a scroll fluid machine configured such that the compressed gas in the discharge chamber is guided to the lower motor chamber through a communication path provided on the outer periphery of the scroll compression element portion, and is discharged outside the device through a discharge pipe. , an annular recess is formed by the outer circumferential surface of the fixed scroll end plate on the discharge chamber side and a side wall of the casing portion of the closed container, and a part of the annular recess surrounds the communication path and is at least the total height of the fixed scroll end plate. By providing a weir with a height of The present invention is characterized in that an oil supply hole for supplying oil stored in the outer recess to the sliding surface of the orbiting scroll end plate is provided on the outer circumference of the fixed scroll end plate.

An oil sump gap is formed between the side wall of the casing part of the sealed container in the outside recess and the outer peripheral part of the fixed scroll end plate, and an oil supply hole for supplying oil to the sliding surface of the orbiting scroll end plate is formed in the oil sump gap. In this embodiment, the opening is provided on the outer periphery of the fixed scroll end plate, so that even when the amount of oil decreases, the necessary amount of oil to be supplied to the sliding surface of the orbiting scroll end plate can be ensured.

[Embodiments of the invention]

Examples of the present invention are shown in FIGS. 11 to 25.

11 and 12 show the shape of the fixed scroll of the present invention.

A communication passage 61 serving as a passage for refrigerant gas is provided on the outer edge portion 60g of the end plate of the fixed scroll 60, and
A weir 65 is provided around the communication path 61. This weir 65 is provided around the communication path 61 by 65a and 65b.
to form.

The heights of the weirs 65, 65a, and 65b are made to match the overall height Hk of the fixed scroll 60.
In addition, the weir 65 is formed on the outer circumferential surface 60j of the fixed scroll.
By forming up to
A and the side wall form an annular recess. Therefore,
The oil separated in the discharge chamber by the weir 65,
It can be collected in the external recess 66 (oil reservoir). Also, by providing weirs 65, 65a, and 65b around the communication passage 61, a gas flow path and a portion where oil accumulates, for example, a recess 67 inside the weir that becomes a gas flow path and an outside weir that becomes an oil reservoir. It serves as a partition from the recess 66. With this, the outer weir recess 6
6 can be prevented from draining toward the in-weir recess 67, that is, the communication path 61, and the oil level in the oil reservoir 66 can be kept constant. In this case, the gap between the outer circumferential surface 60g of the fixed scroll 60 and the side wall 23a of the closed container 23 (the gap is indicated as _gs in FIG. 15) is a minute gap and is made as small as possible, or the dimension is such that there is light contact. Relationship preferred. Reference numeral 63 is a hole for a fixing bolt for fixing the fixed scroll to the frame side. 64,64
a, 64b, 64c, . . . denote oil in the peripheral portion of the end plate (for example, as shown in FIG. 15, an oil groove 69 provided in the outer peripheral portion 2f of the end plate of the orbiting scroll 2) where the fixed scroll and the orbiting scroll make sliding contact. This is the oil supply hole for supplying oil. The weirs 65, 65a, and 65b provided in the end plate portion of the fixed scroll in this way have the effect of a wall that partitions the oil reservoir portion 66 and the gas flow path portion 67 of the communication path 61, and also provide an oil barrier to the outer edge of the fixed scroll. It has the function of accumulating.

FIGS. 13 and 14 show the fixed scroll 60 of the present invention shown in FIGS. 11 and 12 in a sealed container.
This is an example in which the fixed scroll 60 is housed together with the frame 4 in the casing portion 23a of No. 3, and shows the state of oil accumulated on the outer edge portion 66 of the end plate of the fixed scroll 60. 1st
In the embodiments shown in FIGS. 3 and 14, the outer circumferential surface 60j of the fixed scroll 60 is in almost intimate contact with the side wall surface of the casing portion 23a, so that the outer circumferential recess 66 (not a recess) formed by the outer circumferential portion of the head plate The amount of oil collected in the oil reservoir (also referred to as an oil reservoir) is at the height of the position of the weir 65 of the present invention from the seat surface of the fixing bolt pedestal 60n. 2 is an orbiting scroll, and the display of the lap part is omitted. Reference numeral 69 denotes a lubricating oil groove provided on the end plate sliding surface of the orbiting scroll 2. As shown in FIG. 13, the oil separated from the refrigerant gas in the discharge chamber 16 is collected in the outer weir recess 66 of the fixed scroll 60, and the oil 68 is passed through the oil supply hole 64 to the orbiting scroll 2. The oil is supplied to the sliding surface of the outer periphery of the end plate of the fixed scroll 60 and the oil groove 69, and is used to lubricate that part. On the other hand, the refrigerant gas in the discharge chamber, which has a relatively low oil content, moves to the motor chamber 17 below through the weir recess 67, the flow path 61, and the communication path 14, which serve as gas flow paths. In this way, by clearly distinguishing the in-weir recess 67 and flow paths 61, 14, which serve as gas flow paths, and the outer weir recess 66, which serves as an oil reservoir,
Since the amount of oil passing through the communication passages 14 and 61 can be significantly reduced compared to the conventional machine, pressure loss in this area can be kept small.

The oil supply route of the present invention will be explained using FIG. 15 and FIG. 16. FIG. 15 shows a case where the fixed scroll 60 according to the present invention shown in FIG. 11 is used, while FIG. 16 shows a case where an oil strainer 90 is provided at the oil supply port of the oil supply hole 64 of the embodiment shown in FIG. This is an example.

In FIG. 15, the oil supply path is such that the oil 68 accumulated in the outer weir recess 66 on the outer periphery of the end plate of the fixed scroll 60 is supplied to the oil groove 69 of the orbiting scroll 2 via the bent oil supply hole 64. .

In FIG. 16, the oil groove 6 is
9 and the sliding parts of the mirror plate around it are prevented from entering.

FIG. 17 and FIG. 18 show that in a communication path that communicates the discharge chamber 16 and the motor room 17, a weir 71 having the function of an oil reservoir is provided around the communication path 61 on the fixed scroll side, and the weir 71 is An embodiment is shown in which the height _ho of the weir is increased in order to provide the function of a guide for the refrigerant gas discharge passage. The weir 71 is formed up to the outer peripheral surface 60j of the fixed scroll 60 so as to surround the communication path 61. In the embodiment shown in FIG. 18, the oil reservoir 73 on the outer periphery of the end plate of the fixed scroll 60 forms one fan-shaped recess, so that the oil level in the oil reservoir 73 becomes uniform. As shown in the embodiment of FIG. 18, by providing the weir 71 with a function as a guide for the discharge passage, it is possible to improve the separation efficiency of refrigerant gas and oil in the discharge chamber 16 above the fixed scroll. As a result, the amount of oil passing through the communication passage 61 or 14 can be further reduced compared to the conventional machine, so that the pressure loss in this part can be further suppressed.

19 to 22 show that a part of the oil 68 accumulated in the oil reservoir 83 on the outer periphery of the end plate of the fixed scroll is passed down the casing wall 23a of the closed container 23 to the lower part of the container 23 by its own weight. In this embodiment, a plurality of small oil drain grooves 85 are provided on the outer circumferential surface 60j of the fixed scroll 80, and an oil drain groove 4m is provided on the outer circumferential surface 4f of the frame 4 that engages with the oil drain grooves 85. The size of these oil drain grooves 85 and 4m is
It is desirable to make the refrigerant gas as small as possible so that only the grooves 8 pass through and do not blow through the grooves 85 and 4m.

According to the present invention shown in FIGS. 11 to 22, the oil 68 separated from the refrigerant gas in the discharge chamber 16 is passed through the oil supply hole 64 on the one hand to the sliding surface of the end plates 1c and 2f of the fixed scroll and the orbiting scroll. The oil in the oil reservoir on the outer periphery of the end plate of the fixed scroll is supplied to the moving surface and provided for lubrication, and on the other hand, the oil flows down the side wall of the casing part 23a through the oil drain grooves 85, 4m to the closed container. Returned to the bottom of 23.

FIG. 23 shows an embodiment in which the fixed scroll 80 shown in FIGS. 17, 20, etc. of the present invention is housed in a closed container 23. As shown in FIG. 23, the fixed and rotating end plate sliding surfaces 1c and 2f are supplied with oil from an oil reservoir 83 on the outer periphery of the end plate of the fixed scroll 80. The radial oil supply passages (40 in FIG. 6) are not formed. Further, the hermetic terminal 50, which is an outlet for the power source for driving the electric motor 9, is arranged at the center of the casing portion 23a. 50a is a power supply lead wire. Note that the oil groove 69 provided on the outer peripheral portion 2f of the end plate of the orbiting scroll is described in Japanese Patent Application Laid-open No.
56-165787, Japanese Patent Application Laid-Open No. 55-160193, etc., the structure and effects thereof are disclosed, so a detailed explanation will be omitted.

The refrigerant gas is discharged from the discharge hole 1d provided approximately at the center of the fixed scroll 80, and the refrigerant gas collides with the upper chamber 21 of the closed container 23 and heads toward the communication passages 61 and 14, so that the gas flow is changes direction. In this way, the refrigerant gas and oil are separated in the discharge chamber 16 by the effect of their collision and the effect of direction change. The separated oil is stored in an oil reservoir 83 on the outer periphery of the end plate of the fixed scroll.

Therefore, according to the present invention, since oil separation is performed in both the discharge chamber 16 and the motor chamber 17, the oil separation efficiency of the sealed container 23 as a whole is greatly improved. This will be discussed next. Here, assuming that the oil separation efficiency in the discharge chamber 16 is η _s1 and the oil separation efficiency in the motor chamber 17 is η _s2 , the oil separation efficiency η _s of the entire sealed container is approximately given by the following equation.

η _s = η _s1 + (1−η _s1 )・η _s2 ...(1) Oil separation in the closed container of the conventional machine is mainly performed only in the motor room 17, so in this case, oil separation in the closed container of the conventional machine The separation efficiency η _s ′ is expressed by the following formula: η _s ′=η _s2 (2) From equations (1) and (2), η _s >η _s ′ (3). According to the present invention, since the amount of oil coming out of the compressor as a whole can be suppressed to a small level, the airtight container 2
Keep the oil level of lubricating oil 7 at the bottom of No. 3 constant. In this way, the present invention can further improve the reliability of the compressor.

24 and 25 show the outer diameter D _k of the outer peripheral surface of the end plate of the fixed scroll at the portion that will become the oil reservoir 108, and the inner diameter D _f of the casing portion 23a.
This is an example of a structure in which the gap g _k (=(D _f − D _k /2.0)) is made sufficiently smaller than the gap g k (=(D f − D k /2.0)) and the oil 68 is also stored there.
is a bolt that fixes the fixed scroll 100 to the frame 4. Both figures show a fixed scroll that has a gap g _k that allows oil to easily flow between it and the casing 23a of an airtight container, and a shape that prevents oil from flowing between the casing and the casing (the frame 4 and the casing part 23a are fixed by press fitting). In a structure in which the fixed scroll 100 and the discharge gas passages 61 and 14 are provided on the outer periphery of the frame 4, the discharge passage and the fixed scroll are provided at the entrance of the discharge passage of the fixed scroll 100. and the weir 101 that separates the part where oil easily flows between the casing and the casing.
By providing 101a and 101b, an oil reservoir is formed on the outer periphery of the fixed scroll.

Oil supply holes 105, 105a, 105b..., provided in the outer edge portion 100f of the end plate of the fixed scroll 100.
105d is the outer peripheral surface 100 of the end plate outer peripheral portion 100f.
j, and the other end is opened on the thrust sliding surface side of the orbiting scroll 2. The positions of oil inlets such as the oil supply hole 105 and the oil supply hole 64 are set at positions lower than the heights of the weirs 65, 81, and 101 of the present invention. This prevents the refrigerant gas in the discharge chamber from blowing through the oil supply hole to the outer periphery of the end plate where the fixed scroll and the orbiting scroll come into sliding contact.

〔Effect of the invention〕

According to the present invention, it is possible to solve the problems associated with the prior art related to the increase in pressure loss of discharge pressure and the workability of the radial oil supply passage provided in the end plate of the orbiting scroll. Furthermore, since oil separation is performed in both the discharge chamber and the motor chamber within the closed container, the oil separation efficiency of the container as a whole is greatly improved, and the amount of oil coming out of the compressor as a whole can be suppressed to a small level. In this way, the reliability of the scroll compressor can be further improved.

[Brief explanation of drawings]

Figures 1 and 9 are longitudinal cross-sectional views of a conventional hermetic scroll compressor, Figure 2 is a cross-sectional view showing the meshing state of the scrolls, and Figures 3 and 4 are the positional relationships between the Oldham ring and Oldham key. 5 and 6 are a plan view and a longitudinal sectional view showing the structure around the outer periphery of the end plate of an orbiting scroll according to the prior art, and FIG. 7 is a frame showing a broken closed container. The top view of the figure is shown. FIG. 8 is an external perspective view of the frame and fixed scroll, showing a broken closed container. FIG. 10 shows the state of refrigerant gas and oil passing through the communication passages 13 and 14. Figure 11 to 2
FIG. 5 shows an embodiment of the present invention. Figures 11, 13,
17 and 19 are longitudinal sectional views of the fixed scroll of the present invention, and FIGS. 12, 14, 18, and 20 are plan views of the fixed scroll. FIGS. 15 and 16 are longitudinal cross-sectional views around the outer circumference of the scroll to show the oil supply path when the fixed scroll of the present invention is installed. FIGS. 21 and 22 are a longitudinal cross-sectional view and a plan view around the outer periphery of the frame, showing a method of returning the lubricating oil 68 to the lower part of the chamber.
FIG. 23 is a longitudinal sectional view showing the overall structure of the scroll compressor of the present invention. FIG. 24 and FIG. 25 are examples showing the positional relationship between the fixed scroll and the casing portion of the present invention. DESCRIPTION OF SYMBOLS 1... Fixed scroll, 1a... Fixed scroll end plate part, 2... Orbiting scroll, 2a... Orbiting scroll end plate part, 4... Frame, 6...
Main shaft, 7... Lubricating oil, 9... Electric motor, 10, 1
1, 12... Bearing, 13, 14... Communication path, 16
...discharge chamber, 17...motor room, 18...back pressure chamber, 23...airtight container, 30...Oldham ring, 65...weir, 64...lubrication hole, 81...discharge passage guide function Weir, 85...Drainage groove.

Claims (1)

[Scope of Claims] 1. A scroll compression element section and a motor section are housed in a closed container, connected to each other via a rotating shaft supported on a frame, and the inside of the casing section of the closed container is connected to an upper discharge chamber and a lower discharge chamber. It is divided into a motor room and
The scroll compression element unit consists of a fixed scroll with a spiral wrap standing upright on a disc-shaped end plate, and an orbiting scroll that are engaged with each other with the laps inward, and the orbiting scroll is connected by a bearing to an eccentric shaft unit that connects to a rotating shaft. The scroll is rotated without rotating relative to the fixed scroll, and the fixed scroll has a discharge hole that opens in the center and an intake port that opens on the outer periphery. Gas is sucked from the intake port, and the gas is formed by both scrolls. The compressed gas is moved around the compression space to reduce its volume to compress the gas, and the compressed gas is discharged from the discharge hole into the discharge chamber, and the compressed gas in the discharge chamber is transferred to the outer circumference of the scroll compression element. In a scroll fluid machine in which the fluid is led to a lower motor chamber through a communication path provided in the lower part and discharged outside the device through a discharge pipe, the outer circumferential surface of the fixed scroll end plate on the discharge chamber side and the casing part of the closed container are connected to each other. By forming an annular recess with the side wall, and providing a weir in a part of the annular recess surrounding the communication path and having a height at least equal to or higher than the total height of the fixed scroll end plate, the annular recess is formed in the discharge chamber. A recess outside the weir that stores the separated oil and an inside recess that serves as a flow path for compressed gas from the discharge chamber are divided, and the oil stored in the recess outside the weir is supplied to the sliding surface of the orbiting scroll end plate. A closed-type scroll fluid machine characterized by having an oil supply hole provided on the outer periphery of a fixed scroll end plate. 2. The hermetic scroll fluid machine according to claim 1, wherein the oil supply hole opens at the bottom of the recess outside the weir of the fixed scroll and communicates with a sliding surface of the orbiting scroll end plate. 3. An oil sump gap is formed between the side wall of the casing part of the sealed container in the outside recess and the outer peripheral part of the fixed scroll end plate, and an oil supply hole for supplying oil to the sliding surface of the orbiting scroll end plate is formed in the oil sump gap. The closed scroll fluid machine according to claim 1, characterized in that the closed scroll fluid machine is opened and provided on the outer periphery of the fixed scroll end plate.