JP2008121623A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor compatibly establishing high reliability and high efficiency by making oil retained on a slide surface of a fixed scroll end plate and a turning scroll lap tip and keeping a good lubrication condition. <P>SOLUTION: In the scroll compressor, a groove 25 communicating with a passage 24 is provided in a turning scroll 9, a groove 25 communicating with a passage 24 on the turning scroll lap tip 9a, and a structure introducing oil to the grooves 25 is employed. Consequently, oil film at the slide part is thickened, the good lubrication condition is provided, and high efficiency and high reliability can be secured. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a scroll compressor used for an air conditioner, a refrigerator, a blower, a water heater, and the like.

  For conventional scroll compressors, a mechanism that supplies lubricating oil to the sliding parts of the fixed scroll and the orbiting scroll increases the oil film on the sliding surface, improving efficiency by reducing mechanical loss and increasing reliability through improved lubrication. Improvement of sex has been demanded.

  FIG. 7 shows a conventional scroll compressor described in Patent Document 1. In FIG. In FIG. 7, 104 is a fixed scroll, 104a is a fixed scroll end plate, 104b is a fixed scroll wrap, 105 is a orbiting scroll, 105a is an orbiting scroll end plate, 105b is an orbiting scroll wrap, 114 is a discharge port, 120 is an end plate An annular groove 5a, 121 is an annular groove of the end plate 4a, 122 is an outer groove, 123 is an inner groove, and 124 is a suction chamber.

As shown in FIG. 7, an annular groove and an outer groove extending outward from the outer periphery of the annular groove are formed on the end plate of the orbiting scroll so as to communicate the back pressure chamber and the suction chamber, and a pressure intermediate between the discharge pressure and the intake pressure. Is applied to the groove, and is fixed by the flow of lubricating oil entering the suction chamber through the back pressure chamber, the outer groove of the orbiting scroll, the annular groove, the annular groove of the fixed scroll, and the inner groove in this order. By lubricating and recirculating from the discharge port, the lubrication state of the sliding part of the fixed scroll and the orbiting scroll is improved, the mechanical loss is reduced, the efficiency is improved, and the lubrication mechanism has a simple structure. Immediately after that, oil was quickly supplied to the sliding part, and it became possible to provide a scroll compressor with higher reliability.
Japanese Patent Application Laid-Open No. 8-200262

  However, in the conventional configuration, since oil flows from the back pressure chamber to the suction chamber while being lubricated, a large amount of oil enters the suction chamber, but almost no oil is supplied to the compression space whose pressure is higher than that of the suction chamber. The performance also deteriorates due to an increase in viscosity loss. Further, in this fueling system, there is a possibility that the sliding portion between the orbiting scroll wrap and the fixed scroll end plate will be insufficiently lubricated, and the amount of wear at the end of the orbiting scroll wrap may increase. Therefore, it is necessary to maintain high performance and obtain high reliability.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a scroll compressor capable of obtaining high efficiency and high reliability by supplying oil to sliding portions of a fixed scroll and a turning scroll. And

  In order to solve the above-described conventional problems, a seal member is disposed in a gap between the main bearing structure and the support disk of the orbiting scroll, and lubricating oil inside the sealed container is placed in an inner region defined by the seal member. Introducing and having a passage communicating with the inner region partitioned by the seal member inside the orbiting scroll and the end of the orbiting scroll wrap, and having a groove communicating with the passage at the end of the orbiting scroll wrap, It is possible to supply oil to the sliding portion.

  In the scroll compressor of the present invention, oil can be supplied to the sliding portions of the fixed scroll and the orbiting scroll to obtain high efficiency and high reliability.

  In the first invention, a motor composed of a stator and a rotor and a compression mechanism driven by the motor are disposed inside the sealed container, and is formed upright on one surface of the end plate forming a part of the fixed scroll. The wrap which forms part of the orbiting scroll stands upright on the support disc with respect to the spiral fixed scroll wrap formed, and the orbiting scroll wrap having a shape similar to the fixed scroll wrap is engaged with each other, A pair of spiral symmetrical compression spaces is formed in the center, a discharge port leading to the discharge chamber is provided in the center of the fixed scroll wrap, a suction chamber is provided outside the fixed scroll wrap, and swivels through a rotation prevention member As the scroll performs a revolving motion with respect to the fixed scroll, each compression space is partitioned into a plurality of compression chambers that are continuously shifted from the suction side toward the discharge side, and fluid is supplied. The orbiting shaft formed at the end of the crankshaft for changing the volume to reduce the size of the orbiting scroll is engaged with the orbiting scroll orbiting bearing, and the main shaft formed on the crankshaft is the main bearing. A seal member is disposed in the gap between the main bearing component and the orbiting scroll support disk, and the lubricating oil inside the hermetic container is introduced into the inner region defined by the seal member. It has a passage that communicates the inner area partitioned by the sealing member and the tip of the orbiting scroll wrap, and has a groove that communicates with the passage at the tip of the orbiting scroll wrap, and the passage is inside the groove, so it is fixed to the orbiting scroll wrap. Since the oil is supplied to the sliding part with the scroll end plate, the oil film at the sliding part becomes thick, so that a good lubrication state is obtained and the mechanical loss is reduced. High reliability can be obtained. In a pair of compression spaces, gas leakage usually occurs from the compression space with a high pressure to the compression space with a low pressure in the gap between the sliding portions of the orbiting scroll wrap and the fixed scroll wrap, but oil is retained in the sliding portions. Therefore, the sealing performance is improved, the amount of leakage is reduced, and high efficiency is obtained. In addition, even when the gap between the sliding portions of the orbiting scroll wrap and the fixed scroll end plate becomes large at the assembly stage, it is possible to suppress the deterioration of performance by improving the oil sealability and reduce the processing loss. Further, since the passage is inside the groove, it is possible to suppress the occurrence of burrs or the like during processing at a place where the groove and the passage intersect.

  According to the second aspect of the present invention, since the groove is provided on the spiral winding end side of the orbiting scroll wrap with respect to the passage, the pressure in the compression space near the groove becomes lower than the pressure in the compression space near the passage. The oil can easily pass through the passage and flow into the groove. In addition, by changing the position and groove length of the passage outlet at the tip of the orbiting scroll wrap, oil is supplied only to the part where sliding between the orbiting scroll wrap and the fixed scroll wrap is severe or where gas leakage is to be suppressed. Therefore, it is possible to obtain a compressor having high performance and high reliability without supplying only an optimal amount of oil and increasing viscosity loss.

  In the third aspect of the invention, the groove is closed inside the width of the tip of the orbiting scroll wrap so that the efficiency of the oil supplied from the passage being retained in the groove is increased, and the sliding at the tip of the orbiting scroll wrap is further performed. And the leakage of gas from the high pressure compression space to the low pressure compression space can be suppressed, and high performance and high reliability can be obtained.

  According to a fourth aspect of the present invention, at least one groove communicates with one side or both sides of the pair of compression spaces on the spiral winding end side of the orbiting scroll wrap with respect to the passage. In addition to supplying oil to the sliding part, it is possible to supply oil only to the part where sliding between the fixed scroll wrap tip and the orbiting scroll support disk in the compression space is severe, and the sliding part is worn and seized. By suppressing to a minimum oil supply amount, it is possible to suppress viscosity loss, maintain performance, and obtain a highly reliable compressor.

In the scroll compressor according to any one of the first to fourth inventions, in particular, the fifth invention uses CO ₂ as the working fluid, so that the differential pressure is particularly large and the sliding surface of the orbiting scroll and the fixed scroll is used. Even in CO ₂ where the applied load is very large, it is possible to obtain high efficiency and high reliability more effectively.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a scroll compressor according to a first embodiment of the present invention.

  In FIG. 1, the entire inside of the iron sealed container 1 is a high-pressure atmosphere communicating with the discharge pipe 2, a motor 3 at the center, a compression part at the top, and a crankshaft fixed to the rotor 3 a of the motor 3. A main body frame 5 of a compression portion that supports one end of 4 is fixed to the sealed container 1, and a fixed scroll 6 is attached to the main body frame 5.

  The oil hole 7 in the main shaft direction provided in the crankshaft 4 has one end communicating with the oil supply pump device 8 and the other end finally communicating with the orbiting bearing 10 of the orbiting scroll 9. The orbiting scroll 9 that meshes with the fixed scroll 6 to form the compression space 11 is composed of a spiral orbiting scroll wrap 9a and a support disc 9b in which the orbiting bearing 10 is erected. Arranged between.

  The fixed scroll 6 includes an end plate 6a and a spiral fixed scroll wrap 6b. A discharge port 12 is disposed at the center of the fixed scroll wrap 6b, and a suction chamber 13 is disposed at the outer periphery.

  The orbiting shaft portion 4b that is eccentric from the main shaft portion 4a of the crankshaft 4 and is disposed at the upper end portion of the crankshaft 4 engages and slides with the orbiting bearing 10 of the orbiting scroll 9 and is disposed at the lower end portion of the crankshaft 4. The auxiliary shaft portion 4c is pivotally supported by an auxiliary bearing 19 fixed by welding or shrink fitting in the sealed container 1, and is supported at three points of the main shaft portion 4a, the turning shaft portion 4b, and the auxiliary shaft portion 4c. ing. Between the support disk 9b of the orbiting scroll 9 and the first thrust bearing 15a provided on the main body frame 5, a minute gap capable of forming an oil film is provided. An annular seal member 16 that is substantially concentric with the slewing bearing 10 is mounted on the support disk 9b in a loose state, and the annular seal member 16 partitions the back chamber 17 inside and the back pressure chamber 18 outside. Yes.

  The orbiting scroll 9 has a passage 24 that communicates the inner region of the annular seal member 16 with the tip of the orbiting scroll wrap 9a, and further has a groove 25 that communicates with the passage 24 on the tip of the orbiting scroll wrap 9a. The configuration is such that 24 is inside the groove 25.

  The lubricating oil sucked up by the oil supply pump device 8 passes through the oil hole 7 of the crankshaft 4 and is guided to the axial inner space 20 formed between the orbiting bearing 10 and the orbiting shaft portion 14 of the orbiting scroll 9. Is connected to the back pressure chamber 18 formed by being surrounded by the fixed scroll 6 and the main body frame 5 through the throttle portion 21 provided on the back surface of the lap support disk 9b of the orbiting scroll 9, The oil is guided to the suction chamber 13 through the back pressure adjusting valve 22 and the oil supply passage 22a having a function of pressing against the second thrust bearing 15b on the outer peripheral portion of the fixed scroll wrap 6b. The other is guided to the groove 25 via the passage 24 inside the orbiting scroll 9, and oil is held in the sliding portion between the orbiting scroll wrap 9 a and the end plate 6 a of the fixed scroll 6. The remaining oil that has not flowed to the compression section passes through the slewing bearing 10, the back chamber 17, and the main bearing 14 and is discharged to the outside of the compression section.

  A check valve device 23 that opens and closes the outlet side of the discharge port 12 is mounted on the plane of the end plate 6a of the fixed scroll 6, and the check valve device 23 includes a reed valve 23a made of a thin steel plate and a valve presser 23b. Become.

  FIG. 2 is an enlarged view of the passage 24 and the groove 25 as viewed from the direction of the orbiting scroll lap 9a of the orbiting scroll 9. FIG.

  About the scroll compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  One end of the lubricating oil sucked up by the oil supply pump device 8 is guided to the inner region of the annular seal member 16 in the support disk 9 b of the orbiting scroll 9, and passes through the passage 24 inside the orbiting scroll 9 to the groove 25. Since the oil is held in the sliding portion between the orbiting scroll wrap 9a and the end plate 6a of the fixed scroll 6, the oil film at the sliding portion becomes thick and a good lubrication state is obtained, and the mechanical loss is reduced. Higher reliability can be obtained. Further, since the oil is held in the sliding portion, gas leakage from the compression space 11 having a high pressure near the groove 25 to the compression space 11 having a low pressure is suppressed by improving the sealing property of the oil, and high efficiency is achieved. can get. In addition, the optimum oil supply can be obtained simply by controlling the groove depth and width, and the degree of freedom in design is expanded.

  Also, as shown in FIG. 3, by providing a groove on the spiral winding end side of the orbiting scroll wrap 9a with respect to the passage 24, the pressure of the compression space 11 near the groove 25 is the pressure of the compression space 11 near the passage 24. Therefore, the oil can easily flow through the passage 24 and into the groove 25 due to the pressure difference. Further, by changing the position of the outlet of the passage 24 at the front end portion of the orbiting scroll wrap 9a and the length of the groove 25, the sliding between the orbiting scroll wrap 9a and the end plate 6a of the fixed scroll 6 is difficult or the gas leaks. It is possible to supply oil only to the portion where it is desired to suppress dust, and it is possible to obtain a compressor having high performance and high reliability without supplying only an optimal amount of oil and increasing viscosity loss.

  Also, as shown in FIG. 4, the groove 25 is closed inside the width of the tip of the orbiting scroll wrap 9a, so that the efficiency in which the oil supplied from the passage 24 is retained in the groove 25 is increased, and the orbiting scroll wrap is further increased. 9a can reduce the sliding at the tip and suppress the gas leakage from the high pressure compression space 11 to the low pressure compression space 11, thereby obtaining a compressor having high performance and high reliability. .

  Further, as shown in FIGS. 5 and 6, the groove 25 communicates with the passage 24 on one or both sides of the pair of compression spaces 11 on the spiral winding end side of the orbiting scroll wrap 9a. In addition to supplying oil to the sliding portion of the tip and the fixed scroll end plate 6a, it is possible to supply oil only to a portion where sliding between the fixed scroll wrap 6a tip and the orbiting scroll support disk 9b in the compression space 11 is severe. By suppressing wear and seizure of the sliding part, and suppressing the oil supply to the minimum amount, it is possible to suppress viscosity loss and maintain performance, and to obtain a highly reliable compressor .

In addition, by using CO ₂ as the working fluid, high efficiency and high reliability can be achieved more effectively even in CO ₂ where the differential pressure is particularly large and the load applied to the sliding surfaces of the orbiting scroll and the fixed scroll is very large. It is possible to obtain.

As described above, the scroll compressor according to the present invention has a high efficiency and high performance by holding the oil at the sliding scroll wrap tip and the sliding portion of the fixed scroll end plate by providing the groove at the tip of the turning scroll wrap. Reliability can be secured, HFC refrigerant and HC
In addition to a compressor for an air conditioner that uses an FC-based refrigerant, the present invention can also be applied to applications such as an air conditioner that uses a natural refrigerant CO ₂ and a heat pump type hot water heater.

The longitudinal cross-sectional view of the vertical scroll compressor in Embodiment 1 of this invention The enlarged plan view of the channel | path and groove | channel of the turning scroll wrap front-end | tip part of the vertical scroll compressor in Embodiment 1 of this invention The enlarged plan view of the groove | channel in the wrap winding end part with respect to the channel | path of the turning scroll wrap front-end | tip part of the vertical scroll compressor in Embodiment 1 of this invention, and a channel | path The enlarged plan view of the groove | channel which is not connected to the channel | path of the turning scroll wrap front-end | tip part of the vertical scroll compressor in Embodiment 1 of this invention, and compression space The enlarged plan view of the groove | channel connected to the channel | path of the turning scroll wrap front-end | tip part of the vertical scroll compressor in Embodiment 1 of this invention, and one side of compression space The enlarged plan view of the channel | path which is connected to the channel | path of the turning scroll wrap front-end | tip part of the vertical scroll compressor in Embodiment 1 of this invention, and both sides of compression space Expanded sectional view of a conventional vertical scroll compression mechanism

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Discharge pipe 3 Motor 3a Rotor 3b Stator 4 Crankshaft 4a Main shaft part 4b Turning shaft part 4c Subshaft part 5 Body frame 6 Fixed scroll 6a End plate 6b Fixed scroll wrap 7 Oil hole 8 Oil supply pump device 9 Turning scroll 9a orbiting scroll lap 9b support disk 10 orbiting bearing 11 compression space 12 discharge port 13 suction chamber 14 main bearing 15a first thrust bearing 15b second thrust bearing 16 annular seal member 17 back chamber 18 back pressure chamber 19 auxiliary bearing 20 Internal space 21 Throttle part 22 Back pressure adjustment valve 22a Oil supply passage 23 Check valve device 23a Reed valve 23b Valve retainer 24 Passage 25 Groove

Claims (5)

Inside the sealed container, a motor composed of a stator and a rotor and a compression mechanism driven by this motor are arranged, and a spiral fixing formed upright on one surface of the end plate forming a part of the fixed scroll A wrap that forms a part of the orbiting scroll stands upright on the support disk with respect to the scroll wrap, and the orbiting scroll wrap having a shape similar to the fixed scroll wrap meshes with each other so that a spiral symmetry is provided between the two scrolls. A pair of compression spaces is formed, a discharge port leading to a discharge chamber is provided at the center of the fixed scroll wrap, a suction chamber is provided outside the fixed scroll wrap, and the orbiting scroll is interposed via a rotation prevention member. By performing a swiveling motion with respect to the fixed scroll, each compression space is partitioned into a plurality of compression chambers that continuously transition from the suction side toward the discharge side. The volume of the rotating shaft is changed to compress the fluid, and the orbiting shaft portion formed at the end of the crankshaft for orbiting the orbiting scroll engages and slides with the orbiting scroll orbiting bearing and is formed on the crankshaft. A main shaft portion is pivotally supported by a main bearing, and a seal member is disposed in a gap between the main bearing structure and the support disk of the orbiting scroll, and an inner region partitioned by the seal member is disposed inside the sealed container. The inside of the orbiting scroll has a passage that communicates the inner region and the orbiting scroll wrap tip, and the orbiting scroll wrap end has a groove that communicates with the passage, and the passage is more than the groove. A scroll compressor characterized by being inside. 2. The scroll compressor according to claim 1, wherein the groove is provided on a spiral winding end side of the orbiting scroll wrap with respect to the passage. The scroll compressor according to claim 1 or 2, wherein the groove is located inside the width of the scroll wrap tip. 3. The scroll according to claim 1, wherein the groove communicates with the passage at least at one location on one side or both sides of the pair of compression spaces on the spiral winding end side of the orbiting scroll wrap. Compressor. Scroll compressor according to claim 1 using a CO ₂ a high pressure refrigerant as a working fluid.

Images