JP2009085190A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an efficient and reliable scroll compressor keeping sliding parts of a turning scroll and a fixed scroll under a good lubricating condition even in the compression space in which pressure is higher than the pressure in an intake chamber. <P>SOLUTION: A second communication passage 24 communicating with a tip 9c of a turning scroll lap 9a is provided in an end plate 9b of the turning scroll 9 as an oil supply passage supplying lubricating oil from an oil pocket at a bottom part of a hermetic vessel 1, an involute-shaped groove 25 communicating with the second communication passage 24 is provided on the tip 9c of the turning scroll lap 9a, and a pair of circular arc grooves 26 opening to both side compression chambers 30a, 30b opposing to the involute shape groove 25 and the lap are provided. Furthermore, a chip seal 27 fitted with the involute shape groove 25 is provided. Consequently, the sliding part of the turning scroll 9 and the fixed scroll 6 can be maintained under the good lubrication condition even in the compression space 30a, 30b in which pressure is higher than the pressure in the intake chamber 13, and the efficient and reliable scroll compressor can be provided. <P>COPYRIGHT: (C)2009,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.

  In conventional scroll compressors, there is a need to improve the efficiency and reliability by reducing the mechanical loss by improving the lubrication of the sliding surface with a mechanism that supplies lubricating oil to the sliding part of the fixed scroll and the orbiting scroll. It was.

FIG. 2 shows a conventional scroll compressor described in Patent Document 1. As shown in FIG. As shown in FIG. 2, an annular groove 120 and an outer groove 122 extending outward from the outer periphery of the annular groove 120 are formed on the end plate 105a of the orbiting scroll so that the back pressure chamber and the suction chamber 124 communicate with each other. Lubricating oil entering the suction chamber 124 through an intermediate pressure from the back pressure chamber through the outer groove 122 of the orbiting scroll 105, the annular groove 120, the annular groove 121 of the fixed scroll, and the inner groove 123 in this order. By lubricating the fixed and orbiting scroll end plates 104a and 105a and the lap and returning them from the discharge port 114, the lubrication state of the sliding portion of the fixed scroll 104 and the orbiting scroll 105 is improved and the mechanical loss is reduced and the efficiency is improved. In addition, since the oil supply mechanism has a simple structure, oil is quickly supplied to the sliding part immediately after operation, and the scrub with higher reliability. It discloses that it is provided in the Lumpur compressor.
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. There is a problem in reliability such as insufficient lubrication of the sliding part of the orbiting scroll and fixed scroll, resulting in a decrease in efficiency due to an increase in sliding loss and a possibility of increased wear due to interference between laps. Was.

  The present invention solves such conventional problems, and an object thereof is to provide a highly efficient and highly reliable compressor.

  In order to solve the above problems, the present invention provides a first communication passage in the orbiting scroll end plate for supplying lubricating oil from an oil reservoir and a second communication passage communicating with the end of the orbiting scroll wrap, and the second communication passage. A generally involute-shaped groove communicating with the passage is provided at the end of the orbiting scroll wrap, a generally involute-shaped groove and a pair of arc grooves opened in the compression chambers on both sides facing the wrap are provided, and further fitted into the generally involute-shaped groove. In this configuration, a tip seal is provided.

  By adopting the oil supply configuration as described above, it is possible to maintain good lubrication of the sliding portion of the orbiting scroll and the fixed scroll even in a compression space where the pressure is higher than that of the suction chamber, and the efficiency is reduced due to an increase in sliding loss. Burn-in and abnormal wear due to interference between laps can be avoided.

  The scroll compressor of the present invention can provide a highly efficient and highly reliable compressor by improving the lubrication of the sliding portions of the fixed scroll and the orbiting scroll.

  1st invention has the oil reservoir which stores lubricating oil in a bottom part, arrange | positions the internal motive of the airtight container which discharge pressure acts, and the compression mechanism driven with this electric motor, the compression mechanism is fixed to a fixed scroll, fixed A orbiting scroll that meshes with the scroll to form a plurality of compression chambers, a rotation restraint component that prevents the orbiting scroll from rotating and only turns, a crankshaft that orbits the orbiting scroll, and a main shaft formed on the crankshaft Orbiting drive, which includes a bearing part having a main bearing for supporting the orbiting scroll, and engages an eccentric drive engaging portion provided on the crankshaft on the back of the end plate on the side opposite to the orbiting of the orbiting scroll to drive the orbiting scroll. An engaging portion is provided, and the pressure acting on the back surface of the end plate on the outside of the turning drive engaging portion is lower than the discharge pressure acting on the center portion of the back surface of the end plate and the discharge pressure acting on the outer periphery of the back surface of the end plate A sliding partition ring is provided to divide into force, and high-pressure lubricating oil is supplied from the oil reservoir to the center of the back of the end plate, and the back formed in the space outside the center of the end of the end plate and the sliding partition. A first communication passage that communicates with the pressure chamber and a second communication passage that communicates the tip of the orbiting scroll wrap are provided inside the end plate of the orbiting scroll, and communicates with the second communication passage at the tip of the orbiting scroll wrap. A generally involute-shaped groove is provided, a pair of arc grooves are formed in the groove having a diameter larger than the width of the orbiting scroll wrap and open to the compression chambers on both sides facing the wrap, and the generally involute-shaped groove In this configuration, a chip seal that fits in is provided. By adopting such a configuration, it is possible to maintain good lubrication of the sliding portions of the orbiting scroll and the fixed scroll even in a compression space where the pressure is higher than that of the suction chamber. It is possible to avoid seizure and abnormal wear due to interference. In addition, the improved oil seal performance reduces efficiency due to refrigerant leakage between the high-pressure compression chamber and the low-pressure compression chamber that are formed before and after the lap sliding part, and improves lap processing accuracy and assembly accuracy. When the temperature is low, it is possible to suppress a decrease in efficiency due to leakage of the refrigerant from the gap formed between the wraps.

  According to a second aspect of the present invention, a pair of arc grooves that open to the compression chambers on both sides facing the wrap are provided at the winding end of the generally involute-shaped groove that communicates with the second communication passage at the tip of the orbiting scroll wrap. As a result, the pressure difference between the opening portion of the communication passage at the tip of the lap and the opening portion of the arc groove can be increased, and the flow rate of the lubricating oil flowing through the generally involute-shaped groove can be increased and stabilized. As a result, the oil seal performance of the nearby compression chamber is improved, and high efficiency and high reliability of the compressor can be achieved.

  According to a third aspect of the present invention, the depth of the pair of arc grooves opened to the compression chambers on both sides facing the wrap is made deeper than the groove depth of the generally involute shape communicating with the second communication passage at the tip of the orbiting scroll wrap. With this configuration, the lubricating oil that flows out from the opening of the communication passage at the tip of the wrap does not stay in the involute-shaped groove, and new lubricating oil can always be supplied from the arc groove to the compression chamber space. Thus, the lubricating ability can be maintained.

  In the fourth aspect of the invention, by forming a pair of arc grooves opened in the compression chambers on both sides facing the orbiting scroll lap by end milling, simultaneous processing with the tip of the wrap becomes possible, contributing to improvement in productivity. be able to. In addition, severe depth control in circular arc grooving is possible, and compressor performance can be stabilized by controlling the amount of oil supplied to the compression chamber.

  According to a fifth aspect of the present invention, in the scroll compressor according to any one of the first to fourth aspects, the load applied to the sliding surfaces of the orbiting scroll and the fixed scroll by using carbon dioxide as a refrigerant and increasing the differential pressure. High efficiency and high reliability can be provided even in the case where the current becomes very large.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

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

  3 to 6 are an enlarged view and a partially enlarged view as seen from the wrapping direction of the orbiting scroll 9.

  In FIG. 1, a compression mechanism and a stator 3a of an electric motor for driving the compression mechanism are fixed inside a sealed container 1 having a discharge pressure atmosphere having an oil reservoir for storing lubricating oil at the bottom, and the compression mechanism is driven by a rotor 3b of the electric motor. The crankshaft 4 to be connected is connected, and the periphery of the compression mechanism of the sealed container 1 is used as an oil reservoir. The compression mechanism includes a fixed scroll 6, a turning scroll 9 that meshes with the fixed scroll 6 to form a plurality of compression chambers 11, a rotation restraining component that prevents the turning of the turning scroll 9 and makes only turning, and this An orbiting shaft 4b provided on the opposite side of the orbiting scroll 9, an eccentric bearing 10 provided inside the main shaft 4a of the crankshaft 4 and into which the orbiting shaft 4b is fitted, and a main shaft that supports the main shaft 4a of the crankshaft 4. A main bearing part 5 having an axial movement restricting flat surface portion that restricts the axial movement of the orbiting scroll 9 with a small gap from the back surface of the end plate 9b of the bearing 14 and the orbiting scroll 9 is disposed. A space 20 where a discharge pressure applied to the central portion of the gas pressure applied to the end plate 9b acts on the axial movement restriction plane portion, and a back pressure chamber where a pressure lower than the discharge pressure applied to the outer periphery of the rear surface of the end plate 9b acts. A sliding partition ring 16 for partitioning with 18 is disposed.

  Inside the orbiting scroll 9a, there are a first communication passage 24a that connects the discharge pressure working space 20 inside the sliding partition ring 16 and the back pressure chamber 18 via the throttle mechanism 21, and a first communication passage 24a. And the orbiting scroll wrap tip 9c is provided with a second communication passage 24b. The orbiting scroll lap tip 9c is provided with a substantially involute-shaped groove 25 communicating with the second communication passage 24b and an involute. A pair of arc-shaped grooves 26 which are formed in a diameter larger than the width of the orbiting scroll wrap and are open to the compression chambers 30a and 30b on both sides facing the wrap are provided. A chip seal 27 that fits into the groove 25 is arranged.

  The crankshaft 4 is also provided with an oil supply passage 7 penetrating through the crankshaft 4. The end surface of the oil supply passage 7 on the side opposite to the compression mechanism is an oil reservoir through the oil pump 8, and the end surface on the compression mechanism side is the orbiting scroll end plate 9b. It is configured to communicate with the space 20 where the discharge pressure at the center of the back surface acts.

  By adopting such a configuration, the lubricating oil guided from the oil reservoir to the space 20 where the discharge pressure at the center of the rear surface of the orbiting scroll end plate 9b acts by the oil pump 8 or the like is one side from the first communication passage 24a. Via a throttle mechanism 21, a back pressure chamber 18 formed by being surrounded by the fixed scroll 6 and the main bearing part 5, and a back pressure adjusting mechanism 22 having a function of pressing the orbiting scroll 9 against the fixed scroll 6. Then, it is guided to the suction chamber 13. The other flows into the generally involute shaped groove 25 of the orbiting scroll wrap tip 9c via the second communication passage 24b communicating with the orbiting scroll wrap tip 9c, and a pair of arc grooves communicating with the groove 25 26, by supplying appropriate amounts to the compression chambers 30a and 30b on both sides whose pressure is higher than that of the suction chamber 13, lubrication of the sliding portions of the orbiting scroll 9 and the fixed scroll 6 can be maintained satisfactorily. Reduction in efficiency due to increased loss, and seizure and abnormal wear due to excessive interference between laps can be avoided. In addition, an appropriate amount of lubricating oil is supplied to 30a and 30b to improve the oil seal performance, and the efficiency decreases due to leakage of refrigerant between the high pressure compression chamber and the low pressure compression chamber facing each other due to the rise of the tip seal 27. In addition, when the lapping accuracy and the assembly accuracy are low, it is possible to suppress a decrease in efficiency due to the leakage of the refrigerant from the gap formed between the laps. The amount of oil supplied to the compression chamber can be controlled by appropriately selecting the dimensions (length, width, depth etc) of the involute-shaped groove 25 and the pair of arc grooves 26. If the dimensional design is made so that the amount of oil supply is increased within a range where viscosity loss and refrigerant overheating loss do not increase, a highly efficient and highly reliable scroll compressor can be provided.

  Further, as shown in FIG. 5, at the end of winding 25b of the generally involute-shaped groove 25 communicating with the second communication passage 24b at the orbiting scroll wrap tip 9c, the compression chambers 30a and 30b on both sides facing the wrap are opened. By providing a pair of arc grooves 26, the pressure difference between the opening of the second communication passage 24b of the orbiting scroll wrap tip 9c and the opening end of the arc groove 26 can be increased. The flow rate of the lubricating oil flowing through the shaped groove 25 can be increased and stabilized. As a result, the oil seal performance of the nearby compression chamber is improved, and high efficiency and high reliability of the compressor can be achieved.

  Further, as shown in FIG. 6, the compression chambers 30a and 30b on both sides facing the lap are formed with respect to the groove depth of the generally involute-shaped groove 25 communicating with the second communication passage 24b at the orbiting scroll wrap tip 9c. By making the depth of the pair of open circular arc grooves 26 deep, the lubricating oil flowing in from the opening of the second communication passage 24b of the orbiting scroll wrap tip 9c stays at the bottom of the generally involute groove 25. Accordingly, new lubricating oil can always be supplied from the arc groove to the compression chamber space, and the lubricating ability can be maintained.

  Also, as shown in FIG. 7, by forming a pair of arc grooves 26 opened in the compression chambers 30a, 30b on both sides facing the orbiting scroll wrap 9b by end milling, simultaneous machining with the end surface of the orbiting scroll wrap is possible. It becomes possible and can contribute to the improvement of productivity. In addition, severe depth control in arc groove machining is possible, and a highly efficient and highly reliable scroll compressor can be provided by controlling the amount of oil supplied to the compression chamber.

  Further, by using carbon dioxide as a refrigerant, high efficiency and high reliability can be provided even when the load applied to the sliding surfaces of the orbiting scroll and the fixed scroll becomes very large due to an increase in differential pressure. Can do.

  As described above, the scroll compressor according to the present invention is fixed to the orbiting scroll by providing the tip scroll of the orbiting scroll wrap with the generally involute-shaped groove, the pair of arc grooves, and the tip seal that fits the approximately involute-shaped groove. By supplying oil to the sliding part of the scroll, high efficiency and high reliability can be secured. In addition to the compressor for air conditioner using HFC refrigerant or HCFC refrigerant, natural refrigerant carbon dioxide is used. It can also be applied to uses such as air conditioners and heat pump water heaters.

1 is a longitudinal sectional view of a vertical scroll compressor according to an embodiment of the present invention. Expanded sectional view of the vertical scroll compression mechanism in Patent Document 1 of the conventional example The figure seen from the lap side of the turning scroll of the vertical scroll compressor in Embodiment 1 of this invention The elements on larger scale seen from the lap side of the turning scroll of the vertical scroll compressor in Embodiment 1 of this invention The elements on larger scale seen from the lap side of the turning scroll of the vertical scroll compressor in Embodiment 2 of this invention The elements on larger scale of the turning scroll of the vertical scroll compressor in Embodiment 3 of this invention The figure explaining the locus | trajectory of the end mill process of the turning scroll of the vertical scroll compressor in Embodiment 4 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealed container 2 Discharge pipe 3 Motor 3a Rotor 3b Stator 4 Crankshaft 4a Main shaft part 4b Turning shaft part 4c Subshaft part 5 Main bearing parts 6 Fixed scroll 6a Fixed scroll end plate 6b Fixed scroll wrap 7 Oil supply passage 8 Oil supply pump device DESCRIPTION OF SYMBOLS 9 Orbiting scroll 9a Orbiting scroll lap 9b Orbiting scroll end plate 9c Orbiting scroll wrap tip 10 Orbiting bearing 11 Compression space 12 Discharge port 13 Suction chamber 14 Main bearing component 16 Sliding partition ring 17 Back chamber 18 Back pressure chamber 19 Sub bearing 20 Discharge pressure 21 throttle portion 22 back pressure adjustment mechanism 22a oil supply passage 23 check valve device 23a reed valve 23b valve retainer 24a first communication passage 24b second communication passage 25 roughly involute shaped groove 26 pair of arc grooves 27 Chip seal 30ab Compression chambers on both sides of pressure higher than the input pressure 40 End mill 41 End mill machining locus 104 Fixed scroll 104a Fixed scroll end plate 104b Fixed scroll wrap 105 Orbiting scroll 105a Orbiting scroll end plate 105b Orbiting scroll wrap 114 Discharge port 120 End plate 5a Annular groove 121 annular groove of end plate 4a 122 outer groove 123 inner groove 124 suction chamber

Claims (5)

There is an oil reservoir for storing lubricating oil at the bottom, and an electric motor and a compression mechanism driven by the electric motor are arranged inside a sealed container on which discharge pressure acts. The compression mechanism meshes with the fixed scroll and the fixed scroll. A rotating scroll that forms a plurality of compression chambers, a rotation restraint component that prevents the rotating scroll from rotating and only rotates, a crank shaft that drives the rotating scroll to rotate, and a main shaft formed on the crank shaft are supported. Orbiting drive, which is configured to include a bearing component having a main bearing that engages with an eccentric drive engagement portion provided on the crankshaft on the back surface of the orbiting scroll on the side opposite to the lap. An engagement portion is provided, and a pressure acting on the back surface of the end plate on the outer side of the turning drive engagement portion is applied to a discharge pressure acting on the center portion of the back surface of the end plate and an outer periphery of the back surface of the end plate. A sliding partition ring that divides into a pressure lower than the discharge pressure to be supplied, supplies high-pressure lubricating oil from the oil reservoir to the central part of the rear face of the end plate, and outwards from the central part of the rear face of the end plate and the sliding partition ring A first communication passage that communicates with the back pressure chamber formed in the space and the tip of the orbiting scroll wrap, and a second communication passage that communicates with the first communication passage and has the scroll wrap tip at the open end. Is provided in the end plate of the orbiting scroll, and a generally involute-shaped groove communicating with the second communication passage is provided at the end of the orbiting scroll wrap, and is formed in the groove with a diameter larger than the width of the orbiting scroll wrap. And a scroll having a pair of arc grooves opened in the compression chambers on both sides facing the wrap, and further having a tip seal fitted into the substantially involute-shaped groove. Compressor. The scroll compressor according to claim 1, wherein the pair of arc grooves are provided at a winding end of the substantially involute-shaped groove. 3. The scroll compressor according to claim 1, wherein a depth of the pair of arc grooves is deeper than that of the generally involute-shaped grooves. The scroll compressor according to any one of claims 1 to 3, wherein the pair of arc grooves are formed by end milling. The scroll compressor according to any one of claims 1 to 4, wherein carbon dioxide which is a high-pressure refrigerant is used as a working fluid.

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