JPH06173869A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To provide a scroll type compressor capable of preventing effectively lubricating oil from temperature rise and lubricating properly a turning scroll and stationary scroll. CONSTITUTION:A scroll type compressor 24 is provided in an enclosed case 1 with a stationary scroll 3, a turning scroll 10 provided to turn relative to the stationary scroll 3 through a compression space, a motor 5 for turning drivably the turning scroll 10, a lubricating oil reservoir 14 provided in the lower end of the enclosed case 5, a pump mechanism 15 for pumping up the lubricating oil from the lubricating oil reservoir 14 to supply it to a predetermined slide part. After the lubricating oil lubricated the slide part is once taken out of the enclosed case 1 to flow downward, the oil is adapted to flow into the lower end of the enclosed case 1 and return to the lubricating oil reservoir 14 through a discharge pipe 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type in which two blades processed in a spiral shape (a stationary scroll and a swirl scroll) are combined and, for example, a gas is compressed by their relative swirling motion. It concerns a compressor.

[0002]

2. Description of the Related Art A scroll type compressor combines two spirally processed blades, that is, a stationary scroll and a swirling scroll, and compresses gas by their relative movement. .

The stationary scroll is fixed to a frame provided in the upper portion of the closed case. Further, the swivel scroll is located below the stationary scroll, and in a state where the stationary scroll and the stationary scroll are combined with each other through a compression chamber, the axis of the swirl scroll is perpendicular to the lower side of the frame. The motor is loosely fitted to the upper end of the drive shaft (crankshaft) of the motor. Further, the turning scroll is connected to the frame through an Oldham mechanism so as not to rotate on its axis.

The upper end of the drive shaft of the motor is eccentrically provided, and when the motor rotates, the swivel scroll does not rotate but also swivels with respect to the stationary scroll. Exercise. As a result, the compression chamber formed by the stationary scroll and the swirl scroll moves from the radially outer side of the stationary scroll to the central portion while swirling to compress the gas. The compressed gas is discharged to the outside from a discharge port formed at the center of the stationary scroll.

On the other hand, in the lower end of the hermetic case, there is provided a lubricating oil sump for storing lubricating oil for lubricating the upper end of the crankshaft and the sliding parts of the Oldham mechanism and the like. And, at the lower end of the drive shaft of the motor,
A pump mechanism that sucks up the lubricating oil by rotating the drive shaft is provided.

Therefore, the lubricating oil stored in the lubricating oil sump is sucked up into the crankshaft by the operation of the motor and supplied to the respective sliding portions. The lubricating oil that has lubricated the sliding portions is affected by the rotation of the motor and once scattered in the case, and then collected in the lubricating oil reservoir. Then, it is again used to lubricate each sliding portion.

[0007]

By the way, there are cases where the scroll compressor having the above-mentioned structure is continuously operated under an overload condition. In such a case, the lubricating oil that lubricates each sliding portion gradually becomes hot as it circulates in the compressor. As a result, seizure may occur in each sliding portion.

Conventionally, there is no oil supply passage for directly supplying lubricating oil to the sliding portion between the stationary scroll and the revolving scroll located in the compression chamber, and this portion is lubricated by the other sliding portions. After lubricating, the lubricating oil scattered in the closed case was sucked into the compression chamber.

However, the scattering state of the lubricating oil is not uniform, and it is difficult to control the amount of the lubricating oil sucked into the compression chamber. For example, in an invertor compressor or the like, the amount of lubricating oil scattered increases at high speeds, and the amount of oil supplied into the compression chamber increases extremely, which is accompanied by an increase in the amount of oil in the lubricating oil reservoir provided inside the case. Due to the decrease in the oil level, the amount of oil supplied to other sliding parts may decrease.

On the other hand, when the engine speed is low, the amount of splashing decreases as opposed to when the engine rotates at high speed, so that the amount of oil supplied to the compression chamber may be extremely small. As a result, the sealability between the swirl scroll and the stationary scroll may be deteriorated, or the scroll blade itself may be seized, resulting in problems in performance and reliability.

The present invention has been made in view of the above circumstances, and is a scroll type which can effectively prevent a temperature rise of lubricating oil and can appropriately lubricate a swirl scroll and a stationary scroll. It is intended to provide a compressor.

[0012]

The first means of the present invention is to provide a closed case, a static scroll provided in the closed case, and a compression space for the static scroll. Through a swivel scroll, a motor for swiveling the swivel scroll, a lubricating oil sump provided at the lower end of the closed case, and a lubricating oil sump A pump mechanism that sucks up lubricating oil from the above to supply it to a predetermined sliding part, and once the lubricating oil that has lubricated the sliding part is taken out of the closed case and circulated downward, the closed case A lubricating oil pipe is provided which flows into the lower end portion and returns to the lubricating oil sump.

A second means is the scroll compressor of the first means, further comprising a heat exchanger provided in the lubricating oil pipe and cooling the lubricating oil flowing in the pipe. To do.

The third means is a hermetically sealed case, a stationary scroll provided in the hermetically sealed case, and a rotatably mounted on the stationary case via a compression space. A swirl scroll, a motor that swivels the swirl scroll, a lubricating oil sump provided at the lower end of the hermetically sealed case, and sucks lubricating oil from the lubricating oil sump for a predetermined sliding movement. A pump mechanism for supplying the lubricating oil to the sliding parts and a lubricating oil passage that is vertically defined on the inner wall surface of the hermetic case and returns the lubricating oil that has lubricated the sliding parts to the lubricating oil sump. It is a feature.

The fourth means is a closed case, a static scroll provided in the closed case, and the static scroll combined with the static scroll through a compression space to form a static scroll. The swirl scroll sucks and compresses the fluid to be compressed into the compression space by swirling, the motor that swivels the swirl scroll, and the lower end of the closed case. A lubricating oil sump, a pump mechanism that sucks the lubricating oil from the lubricating oil sump and supplies it to a predetermined sliding part, and a part of the lubricating oil supplied to the predetermined sliding part that is sucked into the compression space. An oil supply means for guiding the compressed fluid into the passage is provided.

A fifth means is, in the scroll type compressor of the fourth means, an intake pipe for introducing a fluid to be compressed into the closed case is arranged at a position lower than an outlet of the oil supply means. It is characterized by that.

[0017]

According to the first means, the lubricating oil used for lubrication can be cooled by the outside air. According to the second means
The lubricating oil used for lubrication can be cooled by the heat exchanger. According to the third means, the lubricating oil used for lubrication can be cooled by bringing it into contact with the side wall of the closed case.
According to the fourth means, a part of the lubricating oil can be supplied to the compression space to lubricate the sliding parts of the stationary scroll and the orbiting scroll. According to the fifth means, the lubricating oil can be effectively mixed in the compressed fluid introduced from the intake pipe.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment of the invention described in claims 1, 3 and 4 will be described with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a closed case, and a frame 4 is provided on the upper portion of the closed case 1.
A stationary scroll 3 is non-rotatably fixed to the frame 4 by a bolt 2.

A discharge chamber 1a communicating with a discharge port 3a provided at the center of the stationary scroll 3 is defined above the stationary scroll 3 of the closed case 1. There is. The discharge chamber 1a is provided with a discharge pipe 18 for discharging compressed air to the outside of the closed case 1.

A motor 5 is provided below the frame 4. The motor 5 includes a stator 6 fixed in the closed case 1, a rotor 7 rotatably inserted in the stator 6, and a middle portion supported by the rotor 7. The crankshaft 8 has an eccentric upper end portion 8a protruding toward the upper surface of the frame 4.

On the upper end 8a (eccentric part) of the crankshaft 8 of the motor 5, the swivel scroll 10 is combined with each other through the stationary scroll 3 and the compression chamber 11 (compression space). It is loosely fitted in the closed state. Further, the frame 4 and the turning scroll 10 are provided with the Oldham ring 1 in order to regulate the rotation of the turning scroll 10.
2 (Oldham coupling).

On the other hand, an intake pipe 19 for sucking a compressed gas (compressed fluid) into the closed case 1 is provided on the side wall of the closed case 1 in the height direction. Also,
The frame 4 and the stationary scroll 3 are hermetically sealed.
An air guide hole 9 for introducing the compressed gas sucked into the space 1 to the compression chamber 11 is provided.

Therefore, when the motor 5 operates, the orbiting scroll 10 does not rotate on its own axis but also orbits with respect to the stationary scroll 3. As a result, the compression chamber 11 formed by the stationary scroll 3 and the revolving scroll 10 moves from the outer side in the radial direction of the stationary scroll 3 to the central portion while revolving, and the closed case 1 is closed.
The compressed gas introduced therein is sucked and compressed. The compressed gas is discharged to the outside of the closed case 1 from the discharge port 3a formed at the center of the stationary scroll 3 through the discharge chamber 1a and the discharge pipe 18.

On the other hand, at the lower end of the hermetic case 1, there is provided a lubricating oil sump 14 for accumulating lubricating oil for lubricating the sliding portion of the crankshaft 8 and the orbiting scroll. A pump mechanism 15 (for example, a centrifugal pump) that sucks the lubricating oil by rotating the crankshaft 8 is provided at the lower end of the crankshaft 8.

The pump mechanism 15 is equipped with a suction pipe 16 which is attached so that its axis line coincides with that of the crankshaft 8 and whose lower end is immersed in the lubricating oil in the lubricating oil sump 14. On the other hand, in the crankshaft 8, there are provided thin tubes 17 ... The lower end of which is connected to the pump mechanism 15. This thin tube has a sliding portion (indicated by A in the figure) between the crankshaft 8 and the frame 4, an upper end portion 8a (eccentric portion) of the crankshaft 8 and the orbiting scroll 1.
It is designed to open at a sliding portion (shown by B in the figure) with 0.

At the position corresponding to each sliding portion of the crankshaft 8, the lubricating oil supplied to this portion is partitioned by the upper surface of the frame 4 and the lower surface of the orbiting scroll 10. Lubricating oil grooves 8b, 8 leading to a space (indicated by C in the figure)
c is provided.

On the other hand, as shown in FIGS. 1 and 2, the frame 4 has an opening in the space C, and a part of the lubricating oil introduced into the space C is part of the orbiting scroll 10. A thrust receiving oil supply hole 20 that leads to a thrust receiving portion (shown by D in the figure) that receives a thrust load is provided. Similarly, the frame 4 is provided with a compression chamber oil supply hole 21 (oil supply means of the present invention) that opens into the space C and guides a part of the lubricating oil introduced into the space C to the air guide hole 9. It is provided.

Further, the frame 4 has a discharge hole 23 which opens into the space C and discharges the lubricating oil used for lubrication.
Is provided. On the other hand, the upper surface (thrust receiving portion D) of the frame 4 is provided with an annular groove 24 for flowing the lubricating oil that has finished lubricating the thrust receiving portion D. A communication hole 25 for communicating the annular groove 24 and the discharge hole 23 is provided in the frame 4. Therefore, the lubricating oil that is supplied to the thrust receiving portion D and has finished lubricating the thrust receiving portion D is discharged through the discharge hole 23 together with the lubricating oil from the space C.

On the other hand, as shown in FIG.
The other end is connected to a discharge pipe 26 (lubricating oil pipe of the present invention) which penetrates the closed case 1 and is taken out of the case. The discharge pipe 26 is made of, for example, copper having a high thermal conductivity, is guided downward along the outer surface of the hermetic case 1, and is then connected again to the hermetic case 1. The inside of the closed case 1 is opened.

Therefore, the lubricated lubricating oil passes through the discharge pipe 26 and is returned to the lubricating oil reservoir 14 at the lower end portion of the closed case 1. The lower end opening 26a of the discharge pipe 26 is positioned lower than the motor 5 and higher than the liquid surface of the lubricating oil sump 14.

In the frame 4 shown in FIG. 2, 27
Is a concave portion where the Oldham ring 12 is arranged,
28 is a key groove into which the Oldham key of the Oldham ring 12 is inserted. Next, the lubrication operation of this scroll compressor will be described.

The lubricating oil stored in the lubricating oil sump 14 is sucked up into the crankshaft 8 by the operation of the motor 5, and the sliding parts A and B of the crankshaft are passed through the thin tubes 17 ... Is supplied to.

Then, the lubricating oil 14 that has lubricated the sliding portions A and B is guided into the space C through the grooves 8b and 8c, and a part of the lubricating oil passes through the thrust receiving oil supply hole 20 and the thrust receiving portion. It is used to lubricate the part D, and a part of the lubricating oil is supplied into the air guide hole 9 through the oil supply hole 21 for the compression chamber and used for lubrication in the compression chamber 11.

In addition, the lubricating oil remaining in the space C and the lubricating oil that has finished lubricating the thrust receiving portion D are discharged into the discharge hole 2
3 and the discharge pipe 26 and returned to the lubricating oil sump 14. The lubricating oil is cooled by the outside air by flowing through the discharge pipe 26 provided outside the closed case 1. On the other hand, the lubricating oil that has finished lubricating the compression chamber 11 is discharged from the discharge pipe 18 together with the compressed air.
It is designed to be discharged to the outside of the closed case 1.

According to such a construction, firstly, the lubricating oil is not returned to the lubricating oil sump 14 by scattering the lubricating oil into the sealing case position, but to the outside of the sealing case 1. Since the lubricating oil is returned to the lubricating oil reservoir 14 through the discharged discharge pipe 26, the lubricating oil can be effectively cooled by the outside air.

As a result, it is possible to effectively prevent the temperature of the lubricating oil from rising even under overload operation, so that the lubricating characteristics of the lubricating oil can be maintained and seizure of the crankshaft 8 and the orbiting scroll 10 or the like. There is an effect that can be effectively prevented. Secondly, by providing the compression chamber oil supply hole 21, the lubricating oil is positively supplied into the compression chamber 11.

As a result, in the conventional case, the closed case 1
As compared with the case where the lubricating oil scattered inside is sucked into the compression chamber 11, it is possible to reliably supply the compression chamber 11 and it is possible to control the amount of lubricating oil supplied. . Therefore, it is possible to prevent an extreme difference in the amount of the lubricating oil supplied into the compression chamber 11 due to the number of rotations of the motor 5, and the sliding between the stationary scroll 3 and the swivel scroll 10. There is an effect that the part can be lubricated more appropriately.

Thirdly, by providing the outlet of the compression chamber oil supply hole 21 above the intake pipe 19, the lubricating oil can be effectively mixed into the compressed gas sucked into the compression chamber 11. This has the effect of effectively lubricating the inside of the compression chamber 11. It should be noted that the present invention is not limited to the above-mentioned one embodiment, and can be variously modified without changing the gist of the invention.

For example, in the above embodiment, one end of the compression chamber oil supply hole 21 is opened to the space C.
The present invention is not limited to this, and as shown by 21 'in FIG. 5, it may be opened in the annular groove 24 provided in the thrust receiving portion D. Even in this case, since the lubricating oil is supplied into the air guide hole 9 through the annular groove 24, it is possible to obtain substantially the same effect as that of the above-described embodiment.

Next, an embodiment of the invention described in claim 2 will be described with reference to FIG. The same components as those in the above-described embodiment are designated by the same reference numerals and the description thereof is omitted.

In this scroll type compressor, the middle portion of the discharge pipe 26 is made to meander in an S shape, and a plurality of radiating fins 3 are laminated on the straight portion of the discharge pipe 26 at a predetermined interval.
The heat exchanger 31 is configured by combining 0.
According to such a configuration, the heat radiation area of the discharge pipe 26 can be increased, so that the lubricating oil flowing in the discharge pipe 26 can be cooled more effectively. It should be noted that the present invention is not limited to the above-mentioned one embodiment, and can be variously modified without changing the gist of the invention.

For example, in the above-described embodiment, the heat exchanger is constructed by providing the radiation fins 30 on the discharge pipe 26.
The discharge pipe 26 may be passed through cooling water to form a water heat exchanger.

Next, an embodiment of the invention described in claim 3 will be described with reference to FIG. The same components as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

This scroll type compressor has the above-mentioned closed casing.
A passage 32 (lubricating oil passage of the present invention) provided on the inner wall surface of the casing 1 and vertically communicating with the inner wall surface of the closed case 1 from the discharge hole 23 provided in the frame 4 is formed. A partitioning guide plate 33 is provided.

Therefore, the lubricating oil from the discharge hole 23 provided in the frame 4 is returned to the lubricating oil sump 14 through the passage 32 along the inner wall surface of the closed case 1. It is like this. At this time, since the lubricating oil can exchange heat with the outside air through the side wall of the closed case 1, it is effectively cooled while flowing to the lower end of the closed case 1.

According to this structure, the lubricating oil can be effectively cooled, so that it is possible to effectively prevent the crankshaft 8 and the like from seizing even during overload operation.

[0048]

As described above, according to the first structure of the present invention, with respect to the closed case, the static scroll provided in the closed case, and the static scroll. A swirl scroll provided so as to freely swivel through a compression space, a motor for swivel-driving the swirl scroll, and the above-mentioned sealed case.
Lubricating oil reservoir provided at the lower end of the pump, a pump mechanism that sucks the lubricating oil from this lubricating oil reservoir and supplies it to a predetermined sliding portion, and the lubricating oil that has lubricated the sliding portion is temporarily sealed.
A lubricating oil pipe is provided, which is taken out of the casing and circulated downward, and then flows into the lower end of the closed case and returns to the lubricating oil reservoir.

According to the first structure, since the lubricating oil used for lubrication can be cooled by the outside air, there is an effect that the lubricating characteristics of the lubricating oil can be maintained and the seizure of the orbiting scroll can be effectively prevented. .

The second structure is the scroll compressor of the first structure, which is provided with a heat exchanger provided in the lubricating oil pipe and cooling the lubricating oil flowing in the pipe.

According to the second structure, since the lubricating oil used for lubrication can be cooled by the heat exchanger, the lubricating characteristics of the lubricating oil can be maintained and the seizure of the swirl scroll or the like can be effectively prevented. There is.

In the third structure, the closed case, the stationary scroll provided in the closed case, and the stationary scroll are rotatably provided through the compression space. A swirl scroll, a motor that swivels the swirl scroll, a lubricating oil sump provided at the lower end of the hermetically sealed case, and sucks lubricating oil from the lubricating oil sump for a predetermined sliding movement. And a lubricating oil passage that is vertically defined on the inner wall surface of the sealed case and that returns the lubricating oil that has lubricated the sliding portion to the lubricating oil sump. is there.

According to the third structure, the lubricating oil used for lubrication can be cooled by bringing it into contact with the side wall of the hermetically sealed case, so that the lubricating characteristics of the lubricating oil can be maintained and swirling scrolls and the like can be maintained. It has the effect of effectively preventing image sticking.

In the fourth structure, a closed case, a static scroll provided in the closed case, and the static scroll are combined with each other through a compression space to form a static scroll. The swirl scroll sucks and compresses the fluid to be compressed into the compression space by swirling, the motor that swivels the swirl scroll, and the lower end of the closed case. A lubricating oil sump, a pump mechanism that sucks the lubricating oil from the lubricating oil sump and supplies it to a predetermined sliding part, and a part of the lubricating oil supplied to the predetermined sliding part that is sucked into the compression space. And an oil supply means for guiding the compressed fluid into the passage.

According to the fourth structure, the sliding portions of the stationary scroll and the orbiting scroll can be reliably supplied with oil, and the amount of lubricating oil to be supplied can be controlled. It is possible to prevent an extreme difference in the amount of lubricating oil supplied depending on the number of rotations of the motor, and it is possible to perform more appropriate lubrication.

The fifth constitution is the scroll type compressor of the fourth constitution, in which the intake pipe for introducing the fluid to be compressed into the closed case is arranged at a position lower than the outlet of the oil supply means. It is what

According to the fifth structure, the lubricating oil can be effectively mixed in the fluid to be compressed introduced from the intake pipe, so that the lubrication of the sliding portions of the stationary scroll and the swivel scroll is effective. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the invention described in claims 1, 4, and 5.

FIG. 2A is a vertical cross-sectional view of the frame,
(B) is a top view of the frame.

FIG. 3 is a longitudinal sectional view showing an embodiment of the invention as set forth in claim 2;

FIG. 4 is a longitudinal sectional view showing an embodiment of the invention as set forth in claim 3;

FIG. 5 is a vertical cross-sectional view showing the main parts of another embodiment.

[Explanation of symbols]

1 ... Sealed case, 3 ... Stationary scroll, 5 ... Motor, 1
0 ... Swirl scroll, 14 ... Lubricating oil sump, 15 ... Pump mechanism, 19 ... Intake pipe, 21 ... Compression chamber oiling hole (oiling means), 26 ... Discharging pipe (lubricating oil pipe), 31 ... Heat exchanger ,
32 ... Passage (lubricating oil passage).

Claims (5)

[Claims] 1. A hermetically sealed case, a stationary scroll provided in the hermetically sealed case, and a revolving scroll rotatably provided to the stationary case via a compression space. A motor for driving the swivel scroll, a lubricating oil sump provided at the lower end of the hermetically sealed case, and lubricating oil sucked from the lubricating oil sump to be supplied to a predetermined sliding portion. Lubricating oil for lubricating the pump mechanism and the sliding portion is once taken out of the sealed case and circulated downward, and then flowed into the lower end of the sealed case and returned to the lubricating oil sump. A scroll compressor comprising: a pipe. 2. The scroll compressor according to claim 1, further comprising a heat exchanger provided in the lubricating oil pipe and cooling the lubricating oil flowing in the pipe. Shape compressor. 3. A hermetically sealed case, a stationary scroll provided in the hermetically sealed case, and a swivel scroll provided so as to be rotatable with respect to the stationary scroll via a compression space. A motor for driving the swivel scroll, a lubricating oil sump provided at the lower end of the hermetically sealed case, and lubricating oil sucked from the lubricating oil sump to be supplied to a predetermined sliding portion. A scroll mechanism comprising: a pump mechanism; and a lubricating oil passage, which is vertically partitioned on the inner wall surface of the hermetically sealed case and returns lubricating oil that has lubricated the sliding portion to the lubricating oil sump. -Le type compressor. 4. A closed case, a static scroll provided in the closed case, and the static scroll combined with the static case through a compression space and swiveling with respect to the static scroll. As a result, a swirl scroll that sucks and compresses the fluid to be compressed into the compression space, a motor that swivels the swirl scroll, and a lubricating oil sump provided at the lower end of the closed case And a pump mechanism for sucking the lubricating oil from the lubricating oil reservoir and supplying it to a predetermined sliding portion, and a passage for a compressed fluid in which a part of the lubricating oil supplied to the predetermined sliding portion is sucked into the compression space. A scroll type compressor having an oil supply means for guiding the inside. 5. The scroll type compressor according to claim 4, wherein the intake pipe for introducing the fluid to be compressed into the closed case is arranged at a position lower than the outlet of the oil supply means. Characteristic scroll type compressor.