JPH0633788B2 - Scroll gas compressor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll gas compressor having a device for returning lubricating oil separated from compressed gas on a high pressure side of a compressor to a suction chamber or a compression chamber.

2. Description of the Related Art As is well known in the art, scroll compressors have a suction chamber in the outer periphery and a discharge port in the center of the vortex winding, so that the flow of compressed fluid is unidirectional, such as a reciprocating compressor or a rotary compressor. It is well known that a discharge valve for compressing various fluids is not required, discharge pulsation is relatively small, and a large discharge space is not required.

However, in an actual scroll gas compressor, it is necessary to provide a check valve in the discharge passage or suction passage to prevent reverse flow of compressed fluid in order to prevent reverse rotation immediately after stop. In order to take advantage of the features of scroll compressors, etc., it is necessary to devise a space-saving check valve, and when a check valve is provided in the intake passage, the intake passage resistance increases and intake efficiency decreases. There's a problem.

In addition, especially when compressing gas, it is necessary to make the dimensional accuracy of the eddy coil extremely high in order to reduce the leakage gap of the compression part, but the cost of the scroll compressor is high due to the complexity of the part shape and the dimensional variation. There was a problem that there were large variations in performance.

Therefore, as a measure to reduce the cost and improve the performance of the scroll compressor, the sealing effect using a lubricating oil film to prevent gas leakage between the compression chamber gaps during compression optimizes the dimensional accuracy of the spiral section and improves the compressor performance. Seventh in expectation of stabilization
As shown in the figure, a configuration is known in which the lubricating oil is caused to directly flow into the compression chamber during compression. The structure shown in the figure is a structure in which a motor 703 is arranged in an upper part of a closed container 701, a compression part is arranged in a lower part thereof, and a space 702 inside the closed container is used as a discharge chamber.
The lubricating oil in the oil sump 710 at the bottom of the discharge chamber is fixed to the scroll 70.
No. 5, No. 57-8386, the oil is directly introduced into the compression chamber 723 in the middle of compression through the oil suction pipe 722 having a throttle passage inserted and fixed in the end plate 705a of No. 5 (Japanese Patent Laid-Open No. 57-8386).

Also, as shown in FIG. 8, after the lubricating oil passes through the drive shaft,
It is also conceivable that the main shaft 113 connected to the movable scroll member 119 extends downward, the fixed scroll member 118 and the discharge chamber 131 are arranged around the fixed scroll member 118, and the discharge chamber 131 is arranged above the discharge chamber. After the lubricating oil collected at the bottom of 131 is decompressed via the filter 134 and the orifice 133, it lubricates the sliding part of the main shaft 113 and merges with the intake gas flowing from the intake port 129 in the intake passage 125 and is sucked. After flowing into the chamber, the gap between the compression spaces is sealed with an oil film while being compressed with the compressed gas, and then the discharge port 1 provided on the side plate 1181 of the fixed scroll member 118.
186 and a check valve 500 (valve retainer not shown) are used to discharge again to the discharge chamber 131 (Japanese Patent Laid-Open No. 59-59-59).
192890).

Problems to be Solved by the Invention However, in the configuration in which the compression chamber 723 and the oil sump 710 are always in communication as shown in FIG. 8 described above, a discharge valve for fluid compression is not required in the scroll compression mechanism, and the compression ratio is Since it is constant, the oil reservoir 710 in the closed container internal space 702 is kept at a lower pressure than the compression chamber 723 for a while after the cold start of the compressor which is connected to the closed cycle piping system and operates. The compressing gas in the compression chamber 723 flows back into the oil sump 710, and the lubricating oil in the oil sump 710 is diffused by the backflow gas and flows out to the external piping system of the compressor along with the discharge gas and disappears.
For this reason, the space 7 inside the closed container is
Even if the pressure of 02 rises and becomes higher than the pressure of the compression chamber 723, the sealing effect between the compression chamber gaps due to the oil inflow into the compression chamber 723 until the lubricating oil is collected in the oil reservoir 710 again. On the contrary, there is a problem that the compressed gas in the space 702 inside the closed container flows into the compression chamber 723 to cause a remarkable decrease in compression efficiency and a decrease in durability of the sliding part due to an abnormal temperature rise.

Also in FIG. 9 described above, as in the case of FIG. 8, the lubricating oil at the bottom of the discharge chamber 131 flows into the suction chamber and the compression chamber due to the differential pressure immediately after the compressor is stopped, and when the compressor is restarted. If the load increases abnormally or the lubricating oil sticks out, the spindle 11
There is a problem that the durability of the sliding portion of No. 3 and the check valve 500 is significantly deteriorated.

Further, in order to improve the durability of the check valve 500, it is necessary to improve the rigidity of the valve structure, and there is a problem that the space saving of the discharge chamber 131 is limited.

Therefore, according to the present invention, a check valve device integrated with a check valve device is provided in the middle of the oil supply passage so that a back flow of the compressed gas from the compression chamber to the oil reservoir and the inflow from the oil reservoir to the compression chamber after the compressor is stopped are continued. The present invention provides a scroll gas compressor that prevents the occurrence of the above and has excellent compression efficiency and durability due to effective use of lubricating oil, and realizes low cost and downsizing.

Means for Solving the Problems In order to solve the above problems, the scroll gas compressor of the present invention provides a compressed gas to a discharge chamber through a discharge port provided in a fixed scroll and a check valve device for closing the discharge port. A scroll compression mechanism that discharges is formed, and an oil reservoir in the discharge chamber or an oil reservoir communicating with the discharge chamber is on the upstream side, and the pressure is lower than the oil reservoir and the second compression communicates with the first compression chamber or the suction chamber that does not communicate with the discharge chamber. An oil supply passage having a throttle passage having the chamber as the downstream side is provided, and a check valve device having a reed valve as a valve element is provided in the middle of the oil supply passage in contact with the discharge chamber, and the fixed scroll end plate is disposed above the oil sump. A reed valve and a valve body of the check valve are integrated with each other to form a part of the oil supply passage on the downstream side of the reed valve by the valve retainer of the reed valve, the reed valve and the end plate. is there.

Operation According to the present invention, with the above configuration, the compressor is started at the cold time, the intake gas flowing into the compressor and mixed with the lubricating oil in the middle of the suction passage is discharged to the discharge chamber through the suction chamber and the compression chamber, and the lubricating oil Is partially separated and the discharge chamber pressure is gradually increased.

However, while the pressure of the compression chamber (first compression chamber or second compression chamber) that opens in the oil supply passage is higher than the discharge chamber pressure, the check valve device operates to close the oil supply passage, and It is sequentially compressed to the oil reservoir of the discharge chamber without being bypassed, and after compression is completed, it is discharged to the discharge chamber through the discharge port and the backflow prevention device.

After that, when the pressure of the discharge chamber becomes higher than the pressure of the compression chamber opening in the oil supply passage, the oil supply passage opens and the lubricating oil accumulated in the oil reservoir of the discharge chamber (or the oil reservoir leading to the discharge chamber) flows into the compression chamber and is compressed. The minute gaps between the chambers are sealed with an oil film to prevent compressed gas leakage, improve compression efficiency, and improve sliding part durability due to the compression part cooling effect.

After the compressor is stopped, the check valve device closes the discharge port and the compression chamber becomes the suction side pressure, and the lubricating oil passes through the oil supply passage that has the throttle passage, and the oil sump in the discharge chamber (or the oil sump leading to the discharge chamber). The pressure difference between the gradually decreasing pressure in the discharge chamber and the gradually increasing pressure in the compression chamber falls below the set value, and the inflow of lubricating oil into the compression chamber is stopped early. It further reduces the wasteful leakage of lubricating oil from the oil sump and the load when the compressor is restarted.

Examples Hereinafter, for the scroll gas compressor of the embodiment of the present invention,
A description will be given with reference to the drawings.

FIG. 1 is a vertical sectional view of a scroll gas compressor according to a first embodiment of the present invention, FIG. 2 is a lateral sectional view of a compression section taken along the line AA in FIG. 1, and FIG. FIG. 4 is a characteristic diagram showing a pressure change of gas up to the stroke, FIG. 4 is a characteristic diagram showing a pressure change at a fixed point in each compression chamber, FIG. 5 is a partial cross-sectional view of a check valve device mounting portion in FIG. The figure is the fifth
The partial external view of a figure is shown.

In FIG. 1, 1 and 2 are iron-made hermetically sealed cases, 3 is an iron-made frame whose outer peripheral surface is welded and hermetically sealed together with the hermetically sealed cases 1 and 2 by a single weld bead 4,
The inside of 2 is divided into an upper discharge chamber 5 and a lower drive chamber 6 (low pressure side).

The orbiting shaft 11 of the orbiting scroll 10 is fitted into the eccentric hole 9 at the upper end of the drive shaft 8 which is rotatably driven by the motor 7 which is supported by the frame 3 and is driven and controlled by an inverter power source (not shown). The rotation preventing component 12 engages with the orbiting scroll 10 and the frame 3, and the fixed scroll 13 that meshes with the orbiting scroll 10 is bolted to the frame 3, and the end plate 1 of the fixed scroll 13 is fixed.
4 is provided with a discharge port 15, and a reed valve type check valve device 16 and a check valve device 17 for closing the opening end of the discharge port 15 are attached to the upper surface of the end plate 14.
The bottom of the discharge chamber 5 is a discharge chamber oil sump 18, and an umbrella-shaped punching metal 19 having a large number of small holes is attached to the sealed case 1 at the upper part thereof, and a thin space is provided between the sealed case 1 and the punching metal 19. The discharge chamber 5 is filled with a filter 20 made of a metal wire, and the discharge chamber 5 passes through a discharge pipe 21 provided on the upper surface of the closed case 1 and an intake pipe 22 provided on the side surface of the closed case 2 through an external refrigeration cycle piping system. And a motor chamber oil sump 23 is provided at the bottom of the drive chamber 6.

In FIG. 1, FIG. 2, FIG. 5, and FIG. 6, the end plate 14 is provided between the first compression chamber 39b and the discharge chamber oil sump 18, which do not communicate with the discharge chamber 5 or the suction chamber 33. The valve retainer 4 of the check valve device 17 attached to the oil suction hole 41 and the end plate 14 together with the valve plate 42 made of a thin steel plate also serving as the discharge chamber partition plate.
3 and the end plate 14 are formed with a valve space 44 and a valve plate 42.
Of the first compression chamber 39a and the oil reservoir 18 of the discharge chamber are communicated with each other by a first oil supply passage having a throttle passage composed of a punched groove 45 of the above, and an injection hole 30b of an ultrafine passage provided in the end plate 14. Injection communication hole 5 provided on the end plate 14 branched from the hole 30b
9, a second oil supply passage having a throttle passage formed of the injection hole 30a communicates with each other.

Between the discharge chamber oil sump 18 and the low pressure side drive chamber 6, the valve space 44, the punching groove 45 of the valve plate 42, the oil hole 46 provided in the end plate 14, and the frame are branched from the middle of the first oil supply passage. Three
The oil hole 47 of the ultrafine passage, the upper bearing hole 48 that supports the drive shaft 8 and is provided in the frame 3, the bearing gap of the upper bearing 49, the gap between the swivel shaft 11 and the eccentric hole 9, and the drive shaft 8. The eccentric oil hole 24, the lateral oil hole 50, the bearing oil sump 52 between the lower bearing 51 and the upper bearing 49, which support the drive shaft 8 and are provided at the lower end of the frame 3, and the bearing gap of the lower bearing 51, Is connected by a third oil supply passage having a throttle passage consisting of.

The reed valve 53 of the check valve device 17 and the reed valve 54 of the check valve device 16 are configured by punching out a part of the valve plate 42, and the valve retainer 43 of the check valve device 17 can slightly pass gas. It is made of a porous sintered alloy molded product, part of which also serves as the valve retainer 55 of the check valve device 16, and shallow holes 56 and 57 which also serve as oil reservoirs are provided on the upper surface of the valve retainer 43. There is.

In FIG. 3, the horizontal axis represents the rotation angle of the drive shaft 8, the vertical axis represents the refrigerant pressure, and the pressure change state of the refrigerant gas in the intake, compression, and discharge processes.

In FIG. 4, the horizontal axis represents the rotation angle of the drive shaft 8, the vertical axis represents the refrigerant pressure, and the solid line 60 represents the discharge chamber 5 as well as the suction chamber 3.
3 shows the pressure change at the opening positions of the injection holes 30a, 30b of the first compression chambers 39a, 39b that also do not communicate with 3, and the dotted line 61 indicates the second compression chamber 4 communicating with the suction chamber 33.
0a, 40b (see FIG. 2) represents the pressure change at the fixed point, and the alternate long and short dash line 62 represents the fixed point of the third compression chamber 63a, 63b (see FIG. 2) communicating with the discharge chamber 5 via the check valve device 16. And the two-dot chain line 64 represents the pressure change at a fixed point between the first compression chambers 39a, 39b and the second compression chambers 40a, 40b.

The operation of the scroll gas compressor configured as above will be described.

In FIG. 1 to FIG. 6, when the drive shaft 8 starts to rotate by the motor 7, the orbiting scroll 10 orbits, and the suction refrigerant gas from the refrigeration cycle connected to the compressor enters the drive chamber 6 through the suction pipe 22. After flowing in and separating a part of the lubricating oil contained therein, the lubricating oil is sucked into the suction chamber 33, and this suction refrigerant gas is formed in the second compression chamber 40a (formed between the orbiting scroll 10 and the fixed scroll 13). 40
Orbiting scroll 1 confined in the compression chamber via b)
With the swirling motion of 0, it is sequentially transferred and compressed to the first compression chamber 39a (39b) and the third compression chamber 63a (63b) and discharged to the discharge chamber 5 via the central discharge port 15 and the backflow prevention device 16, Part of the lubricating oil contained in the discharged refrigerant gas adheres to the surface of the lubricating oil when passing through its own weight and the small holes of the punching metal 19 or the filter 20 formed of a fine metal wire, and is separated from the discharged refrigerant gas to be separated from the discharge chamber. The lubricating oil is collected in the shallow holes 56 and 57 of the oil reservoir 18 and the valve retainer 43, and the remaining lubricating oil is carried out to the external refrigeration cycle through the discharge pipe 21 together with the discharge refrigerant gas, and again through the suction pipe 22 inside the compressor through the suction pipe 22. Return to.

For a while after the cold start of the compressor, the pressure in the discharge chamber 5 is lower than the pressure in the first compression chamber 39a (39b) as shown in FIG. The differential pressure oil is not supplied through the first oil supply passage, and the intermediate compression gas does not flow backward from the first compression chamber 39a (39b) to the discharge chamber oil sump 18 due to the effect of the check valve device.

Some time after the cold start of the compressor, the pressure in the discharge chamber 5 rises above the pressure in the first compression chamber 39a (39b), and then the lubricating oil in the discharge chamber oil sump 18 contains the check valve device 17 (17a). Against the urging force of the reed valve 53, the pressure is gradually reduced through the first oil supply passage (second oil supply passage), the differential pressure oil is supplied to the first compression chamber 39a (39b), and the oil is branched from the middle of the first oil supply passage. Punching hole 45 and oil hole 4 of the third oil supply passage configured as
The pressure is gradually reduced through 6 and 47, adjusted to an intermediate pressure between the discharge side pressure and the suction side pressure, and differential pressure oil is also supplied to the upper bearing hole 48 on the side opposite to the compression chamber of the orbiting scroll 10.

The lubricating oil differentially supplied to the first compression chamber 39a (39b) merges with the lubricating oil that has flowed into the compression chamber together with the suction refrigerant gas, and seals a minute gap between adjacent compression chambers with an oil film to leak compressed gas. The compressed gas is discharged again into the discharge chamber 5 while lubricating the sliding surface between the compression chambers.

On the other hand, a part of the lubricating oil differentially supplied to the upper bearing hole 48 lubricates the sliding surface portion with the frame 3 supporting the thrust load acting on the orbiting school 10 and the sliding surface of the rotation preventing component 12. It is mixed with the suction refrigerant gas and flows into the compression chamber again. The remaining lubricating oil flows into the bearing oil sump 52 through the gap between the swivel shaft 11 and the eccentric hole 9, the eccentric hole 9, the eccentric oil hole 24, the oil passage passing through the lateral oil hole 50 and the gap of the upper bearing 49. Then, it is finally decompressed through the minute gap of the lower bearing 51 and flows into the drive chamber 6, a part of which is mixed with the suction refrigerant gas and flows into the compression chamber again, but the remaining lubricating oil remains in the motor chamber oil sump 23.
To be collected.

The lubricating oil in the motor chamber oil sump 23 is diffused to the lower end portion of the rotor of the motor 7 when the oil level rises to some extent, and the driving chamber 6
It is mixed with the suctioned refrigerant gas inside and again flows into the compression chamber, and is finally collected in the discharge chamber oil sump 18.

After the compressor is stopped, the reed valve 54 of the backflow prevention device 16 closes the discharge port, and the discharge port 15 moves to the second compression chamber 40a.
The pressure in the compression space up to (40b) becomes equal to the pressure in the suction chamber 33 through the gap in the compression space. Therefore, the lubricating oil in the discharge chamber oil sump 18 immediately after the compressor is stopped is
Through the oil supply passage and the third oil supply passage, the first compression chamber 39a (3
9b) or the upper bearing hole 48, but the compressed gas gradually flows into the valve space 44 through the fine particles of the valve retainer 43 made of a sintered alloy material, and the pressure difference between the discharge chamber 5 and the valve space 44 becomes small. It contracts and the inflow of lubricating oil stops. Further, the pressure in the first compression chamber 39a (39b) and the upper bearing hole 48 is small because the passage of the injection hole 30a (30b) and the passage of the oil hole 47 are narrow, and the valve space 44 is formed by the sealing effect of the lubricating oil in the middle of the passage.
Since the amount of compressed gas that has flowed into is small, the pressure is not increased so much.

Further, the valve plate 42 prevents the lubricating oil surface of the discharge chamber oil sump 18 from being diffused by the discharge gas.

As described above, according to the above-described embodiment, in the scroll compressor having the check valve device 16 for closing the discharge port 15, the discharge chamber oil sump 18 is on the upstream side, and the discharge pressure is lower than that of the discharge chamber oil sump 18. The first compression chamber 39a (3
9b) on the downstream side, the oil suction / suction hole 41, the valve space 44,
A second oil supply constituted by a punching groove 45 of the valve plate 42, a first oil supply passage formed by the injection hole 30b of the ultrafine passage and an injection communication hole 59 branched from the middle of the injection hole 30b, and an injection hole 30a of the ultrafine passage. A check valve device 17 is provided on the upper surface of the end plate 14 that has a passage, and a reed valve 53 that closes the oil suction hole 41 that opens to the upper surface of the end plate 14 of the fixed scroll 13 in the middle of the first oil supply passage. The valve retainer 43 of 53, the reed valve 53, and the end plate 14 form a part of the first oil supply passage on the downstream side of the reed valve 53, and the reed valve 53 and the valve body of the check valve device 16 are integrated. By doing
With a simple structure, the check valve device 17 for the oil supply passage and the check valve device 16 for the discharge gas passage are combined to save space in the discharge chamber 5, thereby reducing the size of the compressor and reducing the number of parts to reduce costs. It is possible to prevent an increase in compressor cost due to the use of the check valve device 17.

In addition, the pressure in the first compression chambers 39a and 39b in which the first oil supply passage and the second oil supply passage are opened is higher than the pressure in the discharge chamber 5 for a while after the cold start of the compressor or the warm restart. At most, the gas in the middle of compression does not flow back into the discharge chamber oil sump 18 due to the check valve action of the check valve device 17, and after the compression is completed the discharge chamber 5
It is possible to prevent the lubricating oil in the discharge chamber oil sump 18 from diffusing due to the backflow gas and flowing out to the refrigeration cycle outside the compressor. It is possible to start the oil injection into the first pressurizing chambers 39a and 39b later and to seal the gap between the compression chambers with the oil film to start the early effect of improving the compression ratio.

Further, after the compressor is stopped, the check valve device 17 closes the discharge port 15 and the space from the discharge port 15 to the suction chamber 33 becomes the suction side pressure, and the lubricating oil in the discharge chamber oil sump 18 is kept for a short time. The pressure difference between the pressure of the discharge chamber 5 that gradually decreases while flowing into the first compression chambers 39a and 39b and the pressure that gradually increases to the first compression chambers 39a and 39b is less than or equal to a set value corresponding to the biasing force of the reed valve 53. Becomes the first compression chamber 39 for the lubricating oil
Since the inflow of a and 39b is stopped, the inflow of the lubricating oil into the first compression chamber is blocked early to prevent the unnecessary outflow of the lubricating oil from the oil reservoir 18 of the discharge chamber and the liquid compression at the time of restarting the compressor to start the engine. The load can be reduced.

Further, according to the above-mentioned embodiment, by integrating the valve retainer 43 of the check valve device 17 and the valve retainer 55 of the check valve device 16, the space of the discharge chamber 5 and the cost of parts can be further reduced. Therefore, it is possible to provide a low-cost and small scroll gas compressor having excellent compression efficiency and durability.

Although the first compression chambers 39a and 39b are provided on the downstream side of the first oil supply passage and the second oil supply passage in the above embodiment, the suction chamber 33 is used.
Even if the second compression chambers 40a and 40b leading to the compressor are used, the same operation and effect are obtained, and instead of the discharge chamber oil sump 18 in the discharge chamber 15, an oil sump is provided on the high pressure side outside the compressor to provide a closed shell. Oil may be supplied to the compression chamber by an oil supply pipe penetrating through 1.

Further, the operation of the refrigerant compressor has been described in the above embodiment, but the same operation and effect can be expected in the case of other gas compressors such as oxygen, nitrogen, and helium that use lubricating oil.

EFFECTS OF THE INVENTION As described above, the present invention forms the scroll compression mechanism that discharges into the discharge chamber through the discharge port provided in the fixed scroll and the check valve device that closes the discharge port, and the oil reservoir of the discharge chamber or the discharge chamber is formed. Is provided with an oil reservoir communicating with the upstream of the oil reservoir, and an oil supply passage having a throttle passage having a downstream side of the first compression chamber which is lower in pressure than the oil reservoir and does not communicate with the discharge chamber or the second compression chamber which communicates with the suction chamber, and the oil supply passage. A check valve device that uses the reed valve as the valve element is installed on the end plate of the fixed scroll that is in contact with the discharge chamber and above the oil sump, and the reed valve retainer and the reed valve and end plate By forming a part of the oil supply passage on the downstream side of the valve and integrating the reed valve with the valve body of the check valve device, the check valve device of the oil supply passage and the discharge gas passage can be formed with a simple structure. Check valve that doubles as a check valve device It is possible to reduce the cost by reducing the size of the compressor and the number of parts by securing the space for installing the device and saving the space of the discharge chamber, and to prevent the increase in the cost of the compressor due to the adoption of the check valve device.

In addition, the pressure of the compression chamber, which does not communicate with the discharge chamber due to the constant compression ratio of the scroll compression mechanism, is not significantly affected by the discharge chamber pressure, and for a while after the compressor starts cold or after an instant restart.
Even when the pressure of the first compression chamber or the second compression chamber where the oil supply passage opens is higher than the pressure of the discharge chamber, the gas in the middle of compression is discharged by the check valve action of the check valve device. Back flow into the discharge chamber) and is discharged to the discharge chamber after compression is completed to increase the pressure rise in the discharge chamber, and the back flow gas causes the lubricant oil in the discharge chamber oil reservoir (or the oil reservoir leading to the discharge chamber) to rise. Since it can be prevented from diffusing and flowing out to the piping system outside the compressor, oil injection into the first compression chamber or the second compression chamber after the pressure in the discharge chamber has risen can be started earlier, and the space between the compression chambers due to the oil film can be started. By sealing the gap, it is possible to start the early effect of improving the compression efficiency.

After the compressor is stopped, the check valve device closes the discharge port, and the discharge port and the compression chamber become the suction side pressure, and the lubricating oil is kept in the sump (or the oil communicating with the discharge chamber) of the discharge chamber for a short time. From the reservoir) to the compression chamber little by little, but the pressure difference between the discharge chamber and the compression chamber falls below the set value corresponding to the biasing force of the reed valve, and the inflow of lubricating oil into the compression chamber stops, so compression An inexpensive check valve device with a simple structure, such as preventing the inflow of lubricating oil into the chamber early to prevent wasteful lubricating oil outflow and liquid compression when the compressor is restarted to reduce the starting load. Has many excellent effects.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a scroll gas compressor according to a first embodiment of the present invention, FIG. 2 is a lateral sectional view of a compression section taken along the line AA in FIG. 1, and FIG. FIG. 4 is a characteristic view showing a pressure change of the gas up to the stroke, FIG. 4 is a characteristic view showing a pressure change at a fixed point in each compression chamber, FIG. 5 is a partial cross-sectional view of the check valve device mounting portion in FIG. The figure is the fifth
FIG. 7 is a partial external view, FIG. 7 and FIG. 8 are cross-sectional views of scroll gas compressors having separate conventional oil supply passages. 1, 2 ... sealed case, 5 ... discharge chamber, 6 ... drive chamber,
7 ... Motor, 10 ... Orbiting scroll, 13 ... Fixed scroll, 14 ... End plate, 15 ... Discharge port, 16
...... Check valve device, 17 ...... Check valve device, 18 ...... Discharge chamber oil sump, 21 ...... Discharge pipe, 22 ...... Suction pipe, 23 ......
Motor chamber oil sump, 30a, 30b ... Injection hole, 33 ... Suction chamber, 39a, 39b ... First compression chamber,
40a, 40b ... second compression chamber, 41 ... oil suction hole, 43 ... valve retainer, 45 ... punching hole, 53,54
...... Reed valve, 55 …… Valve retainer, 59 …… Injection communication hole.

Claims (2)

[Claims] 1. A plurality of orbiting scrolls are oscillatably meshed with a fixed scroll to form a spiral compression space between the scrolls, and the compression spaces continuously move from the suction side toward the discharge side. And a discharge port provided in the fixed scroll and a backflow prevention valve device that closes the discharge port to form a scroll compression mechanism that discharges compressed gas into the discharge chamber. An oil reservoir communicating with the oil reservoir or the discharge chamber of the upstream side and a throttle passage having a downstream side of the first compression chamber having a lower pressure than the oil reservoir and not communicating with the discharge chamber or the second compression chamber communicating with the suction chamber with the downstream side. A check valve device having a reed valve as a valve element is provided on the end plate of the fixed scroll which is in contact with the discharge chamber and above the oil reservoir, and the reed valve is provided in the middle of the refueling passage. Of the reed valve and the end plate form a part of the oil supply passage on the downstream side of the reed valve, and the reed valve and the valve body of the check valve are integrated into a scroll gas. Compressor. 2. The scroll gas compressor according to claim 1, wherein the valve retainer of the check valve device and the valve retainer of the check valve device are integrated.