JP3909591B2 - Scroll fluid machinery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a scroll fluid machine that compresses fluid by a fixed scroll and a orbiting scroll and discharges the fluid to the outside. More specifically, the present invention relates to a spiral that fits a spiral wrap planted on the fixed scroll end plate from the center to the outer periphery. The present invention relates to a scroll fluid machine including a turning scroll that is connected to a rotating shaft that communicates with a driving source at a central portion of an end plate in which a wrap is implanted and that is driven to turn.
[0002]
[Prior art]
  The scroll fluid machine sequentially compresses the fluid taken in from the periphery by the sealed space formed by the fixed scroll and the orbiting scroll and sends the compressed fluid to the central portion, and discharges the compressed fluid from the central portion. Due to the fluid compression, the sealed space between the laps becomes high temperature, which has the problem of accelerating the deterioration of bearings, seal members, etc. provided in the drive part. Cooling is performed to suppress the rise.
[0003]
  As this cooling method, there are known a non-drive portion cooling method for cooling the fixed scroll and a drive portion cooling method for cooling the orbiting scroll.
  The system shown in FIG. 16 is a technique related to a non-driving unit cooling system, in which a frame body 109 is provided in an airtight container 105, a turning scroll 116 is disposed on the frame body, and the bottom of the end plate 114 of the turning scroll is provided. The shaft 113 is suspended and the shaft 113 is eccentrically connected to the rotating shaft 104 connected to a drive source (not shown) through an opening provided in the center portion of the frame 109, and is fitted to the lap 115 of the orbiting scroll 116. A fixed scroll 112 having a wrap 111 to be fitted is arranged.
[0004]
  In the fixed scroll 112, a gas suction port 118 is formed in the outer peripheral portion, and the orbiting scroll 116 revolves and swings with respect to the fixed scroll 112 by the rotation of the rotating shaft 104, and the sucked gas is formed by the wraps 111 and 115. The sealed space is compressed by gradually forming a small volume, and the compressed gas is configured to be discharged to the outside through the discharge pipe 120 from the discharge port 121 provided at the center of the fixed scroll 112. Yes.
  And in the end plate 110 of the fixed scroll 112, the several heat pipe 122 which cools the heat | fever which generate | occur | produced in the said compression process is arrange | positioned radially from the center part toward the outer periphery.
[0005]
  In addition, a drive unit cooling system for cooling the orbiting scroll as disclosed in FIG. 17 is also known.
  In the figure, a casing 211 is composed of a casing body 212 and a front casing 213, a drive shaft 214 is rotatably supported on a bearing portion of the casing body 212 via a bearing 215, and one end side of the drive shaft 214 is a bearing. Projecting outside the unit and connected to a motor (not shown), the axis O2-O2 of the crankshaft 214B is eccentric by a distance δ with respect to the axis O1-O1 of the drive shaft 214.
[0006]
  The orbiting scroll 216 is formed with an end plate 216a, a spiral wrap portion 216b formed on the front side of the end plate 216a, and a back surface side of the end plate 216a with the axis O2-O2 as a center. A boss portion 216c having a smaller diameter than the peripheral end surface, an annular protrusion 216d formed on the peripheral side on the back side of the end plate 216a, and a plurality of vent holes 216e formed in the radial direction with respect to the annular protrusion 216d, It is composed of
[0007]
  The fixed scroll 221 includes an end plate 221a, a spiral wrap portion 221b formed on the end plate 221a, and a cylindrical portion 221c formed around the wrap portion 221b.
  By arranging the wrap portion 221b so as to overlap the wrap portion 216b of the orbiting scroll 216 by shifting by a predetermined angle, each lap forms a plurality of compression chambers when the orbiting scroll rotates.
  A counterweight 225 is attached to the rotating shaft 214 in the housing 212, and a centrifugal fan 226 that generates cooling air by the rotation of the driving shaft 214 is attached to the counterweight 225.
[0008]
[Problems to be solved by the invention]
  According to the above-described prior art, in the non-driving unit cooling method shown in FIG. 16, the heat pipe 122 is provided on the end plate of the fixed scroll, so that the heat absorption unit of the heat pipe 122 is driven by the fixed scroll. It is located far from the scroll, and the heat conduction path is formed by the tip of the wrap 115 of the orbiting scroll, the end plate 110 of the fixed scroll, and the sealed space in which the gas formed by the end plate 110 and the wrap is compressed. Cooling around the bearings, seal members, and the like that are driven in contact with the motor is less efficient than the cooling of the fixed scroll, and the temperature distribution is not constant.
[0009]
  Further, cooling of the heat release portion of the heat pipe 122 is performed by releasing heat to the sealed container inner space 105a filled with the gas sucked by the suction pipe 119.
  Since the compression space formed by the fixed scroll and the orbiting scroll is connected to the space 105a, the suction port 118 through which the gas is sucked is connected to the space 105a. The air is sucked into the compression space, and the cooling efficiency is lowered.
  In order not to lower the cooling efficiency, it is necessary to provide a special cooling means outside the inlet pipe 119. This complicates the configuration and increases the size of the apparatus.
[0010]
  In the drive unit cooling system shown in FIG. 17, external air is forcibly sucked from the intake passage 227 by the centrifugal fan 226 by the rotation of the drive shaft 214, and is discharged from the exhaust passage 228 through the annular space B and the cooling air passage 220. The
  In this method, the gas after cooling the central portion of the orbiting scroll 216 is exhausted from the exhaust passage 228 along the back of the orbiting scroll 216, and this exhaust passage is required, and in order to further increase the cooling efficiency. However, it is necessary to separately provide a fan for cooling the back surface of the fixed scroll 221, and there is a problem that the apparatus becomes large.
[0011]
  In view of the above circumstances, an object of the present invention is to provide a scroll fluid machine with good cooling efficiency.
  Another object of the present invention is to provide a scroll fluid machine with good durability.
  Another object of the present invention is to provide a small scroll fluid machine.
[0012]
[Means for Solving the Problems]
  A feature of the present invention is that a fixed scroll in which a spiral wrap is implanted from the central portion of the end plate toward the outer periphery, and a drive source communicates with the drive source in the central portion of the end plate in which the spiral wrap to be fitted to the spiral wrap is implanted. In a scroll fluid machine having a orbiting scroll that is connected to a rotating shaft and driven to orbit,
  A hollow cooling passage is formed in the rotating shaft, and a fan is disposed at an end of the rotating shaft so that a cooling gas is introduced from one end of the rotating shaft and exhausted from the other end. A communication hole is formed at the other end of the passage to conduct toward the outer periphery of the rotary shaft, and the central portion of the orbiting scroll is cooled by forcibly exhausting the gas that contributes to cooling from the communication hole by the fan. The structure is such that the gas other than the central portion is cooled by a gas that does not pass through the communication hole, and preferably the fan is disposed at the other end or both ends of the rotating shaft.
[0013]
  With this configuration, the rotating shaft can be directly cooled, and the orbiting scroll is orbitally driven by the rotating shaft connected to the drive source at the center of the end plate, and the fluid taken in from the periphery of the scroll is centered. The heat generated in the process of sequential compression and transfer can be cooled at the highest central part, and the bearings and seal members provided around the central part of the orbiting scroll, as well as the bearings and seal members around the rotating shaft are efficient. Can cool well.
  Further, the difference due to thermal expansion between the fixed scroll and the orbiting scroll can be eliminated, the temperature distribution can be made constant, the galling of the wrap can be prevented, and the grease maintenance period can be extended, so that the durability can be improved.
  In addition, the clearance of each scroll can be reduced by reducing the heat generation, and the ultimate pressure can be improved by performing high speed operation.
[0014]
  Further, it is more preferable that turbulent flow forming means for stirring the introduced cooling gas is provided in the cooling passage.
  With this configuration, the gas cooling means can be formed with a simple configuration, and by providing the turbulent flow forming means, the temperature difference between the gas near the inner wall surface of the cooling passage and the central portion can be rapidly increased. Shrinkage and efficient cooling can be performed.
[0015]
  Further, according to the present invention, the cooling gas 32 passes through the cooling passages 11Ad (FIG. 1) and 11Bd (FIG. 2), thereby cooling the central portion of the orbiting scroll 3, and the gas contributing to this cooling communicates. The air is forcedly exhausted by the fan 13 disposed at the other end from the holes 11Ac (FIG. 1) and 11Bc (FIG. 2).
  The fan 13 disposed at the other end further exhausts the gas that has cooled the back surface of the housing 4, which is a fixed scroll in which the wrap 7 is implanted, as indicated by an arrow 40 (FIG. 8).
  Therefore, not only the center part of the orbiting scroll but also other parts are cooled, and efficient cooling can be performed.
[0016]
  Also,As a reference exampleA fixed scroll in which a spiral wrap is implanted from the central portion of the end plate toward the outer periphery, and a rotating shaft connected to a driving source in the central portion of the end plate in which the spiral wrap is fitted. In a scroll fluid machine equipped with a turning scroll that is driven to turn,
  A hollow cooling passage is formed in the rotating shaft, and a pair of heat transfer means having an evaporation portion at one end and a condensing portion at the other end are inserted into the hollow cooling passage, and the center of the rotating shaft is The evaporation part of each heat transfer means is positioned and the central part of the orbiting scroll is cooled. Preferably, the condensation part of each heat transfer means is located at both ends of the rotating shaft and provided at both ends. It is preferable that the rotating scroll or the anti-wrap portion of the fixed scroll be cooled together with the condensing portion of the heat transfer means by the fan.
  As shown in FIG. 3, a pair of heat pipes 24 </ b> A and 24 </ b> B are disposed in a hollow path 11 </ b> Cd opened in the axial direction of the rotating shaft 11 </ b> C.
  As shown in FIG. 4, the heat pipe 24 includes a wick structure 28 provided in a sealed container 25 by copper, stainless steel, nickel, tungsten, molybdenum, and the like, and an internal space 25 d surrounded by the wick structure 28. And a working fluid that changes between the wick structure and the internal space 25d by heating and cooling, vaporizes, liquefies, and circulates, receives heat from the central portion of the orbiting scroll by the evaporation portion 25a, The operating liquid is vaporized and moves to the condensing unit 25c as indicated by an arrow 37. In the condensing unit 25c, heat is released and liquefied to return to the wick structure 28 as the operating liquid.
  The heat transport amount of the heat pipe 24 can be several hundred times larger than that of metals such as copper and aluminum having good thermal conductivity, so that the central part of the orbiting scroll is efficiently cooled. be able to.
[0017]
  With this configuration, for example, the cooling air flows in the directions of arrows 35 and 36 as shown in FIG. 3 by the fans 12 and 13 disposed at both ends of the rotating shaft, and the heat radiating portions of the pair of heat pipes 24A and 24B. (Condensing part) is cooled.
  Further, in the case of a combination of a double wrap orbiting scroll having fixed orbiting wraps on both surfaces of the end plate and a fixed scroll, the rotation of the fans 12 and 13 arranged at both ends of the rotating shaft causes the arrow direction 39, The cooling air moves to 40 (FIG. 8), and the gas that has cooled the anti-wrap portion of the fixed scroll formed by the housings 4 and 5 can be discharged together with the cooling of the heat pipe by the fan.
[0018]
  Further, the present invention is also applied to a combination of a single wrap orbiting scroll having a rotating wrap planted on one surface of an end plate and a fixed scroll. In this case, the fixed scroll is positioned in the vicinity of the fan. There are two types: a method in which the turning scroll is positioned, and a method in which the fan cools the condensing portion of the pair of heat pipes 24A and 24B and exhausts the gas that has cooled the anti-wrap portion of the fixed scroll or the turning scroll.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention unless otherwise specified. Absent.
[0020]
  FIG. 1 is a first embodiment diagram showing an assembly structure of a rotating shaft and a fan of a scroll fluid machine according to an embodiment of the present invention, and FIG. 2 is a diagram of the rotating shaft and fan of the scroll fluid machine according to an embodiment of the present invention. Second embodiment showing assembly structureFigure5 is an assembly structure diagram of the scroll fluid machine according to the embodiment of the present invention, FIG. 6 is a view seen from the CC direction of FIG. 5, FIG. 7 is a view seen from the DD direction of FIG. FIG. 8 is a partially enlarged view of FIG. 1, and FIGS. 9 to 12 are views showing the action of the scroll in a state in which the rotation shafts are each rotated by 90 °. FIG. 9 shows the introduction of gas for gas ballast. FIG. 10 is a schematic diagram showing the state of the scroll in which the gas for gas ballast is introduced, and FIG. 11 is a diagram of the scroll immediately before the end of the introduction of the gas for gas ballast. FIG. 12 is a schematic view showing the state of the scroll with the gas introduction hole for gas ballast closed, and FIG. 13 is an assembly of the rotary shaft and fan of the scroll fluid machine according to the embodiment of the present invention. An improved embodiment of the first embodiment showing the structure is shown. FIG 14, showing an improved example of the second embodiment showing the assembled structure of the rotary shaft and the fan scroll fluid machine according to an embodiment of the present inventionIt is.
[0021]
  First, a basic structure of a scroll fluid machine to which a rotating shaft cooling structure according to an embodiment of the present invention is applied will be described.
  In FIG. 5, the rotation shaft 11 of the pump main body 1 is connected to the drive shaft of the motor 2 at the right end and is rotatably provided by the rotational force of the motor 2.
  The central portion of the rotating shaft 11 has an eccentric portion 11a whose outer periphery is slightly swollen from the rotational center axis, and both end portions of the eccentric portion 11a are supported by bearings and packing portions of the housings 4 and 5. It is provided to be rotatable.
[0022]
  Each of the housings 4 and 5 constituting the fixed scroll has a circular lid shape, and a peripheral wall functioning as a casing is brought into contact with each other via a seal member to form a sealed space therein.
  The housing 4 is provided with a lap sliding surface 4b perpendicular to the axial direction, and the sliding surface 4b has a non-eccentric portion at the central portion thereof that is out of the eccentric portion 11a of the rotating shaft 11 described above. An opening 4i (FIG. 8) that fits rotatably is provided, and a spiral wrap 7 is implanted in a clockwise direction when viewed from the direction of the arrow 30 with the vicinity of the opening as a tip 7a (FIG. 9). A groove is provided on the upper edge of the wrap 7, and a self-lubricating tip seal 14 such as a fluorine-based resin that makes contact with the sliding surface of the other side and completes the sealing state is fitted into the groove (FIG. 8). Has been.
[0023]
  A discharge hole 4c (FIGS. 8 and 9) having an opening is formed in the sliding surface 4b in the vicinity of the tip 7a of the wrap 7, and from the discharge hole 4c to the outer peripheral surface 4a of the housing 4 through the discharge passage 4d. The compressed gas is discharged from the provided discharge port portion 9 to the outside.
  The base 4f on the side opposite to the wrap of the housing 4 is provided with an introduction pipe 10 for introducing gas for gas ballast. The gas passes from the introduction pipe 10 through the passage 4g to the sealed space R through the passage 4g. be introduced.
[0024]
  Further, three pairs of revolution mechanisms 17 are provided on the peripheral wall portion of the housing 4 at three positions in the circumferential direction at 120 °.
  The revolution mechanism 17 is connected to a turning scroll described later.
  A suction port 8 is provided in the outer peripheral portion 4a of the housing 4, and the suction port 8 is connected to a container (not shown) to be evacuated, and the container is opened from the container through the opening 8a. The gas inside is aspirated.
[0025]
  On the other hand, the housing 5 is provided with a lap sliding surface 5b perpendicular to the axial direction, and the sliding surface 5b is not decentered from the eccentric portion 11a of the rotary shaft 11 at the center. An opening is provided in which the portion is rotatably fitted, and a spiral wrap 6 is implanted in the counterclockwise direction when viewed from the direction of the arrow 31 with the vicinity of the opening as a peripheral end. Is provided with a chip seal 14 (FIG. 8) that is in contact with the mating sliding surface and completes the sealed state.
[0026]
  The orbiting scroll 3 is fitted into the internal space formed by the housings 4 and 5 so as to be able to revolve.
  In the orbiting scroll 3, laps 26 and 27 that can be fitted with laps provided on the fixed scroll are planted on sliding surfaces 3d and 3f of a plate formed in a disk shape.
[0027]
  The wrap 26 is provided for clockwise rotation when viewed from the direction of the arrow 30, and the wrap 27 is provided for counterclockwise rotation when viewed from the direction of the arrow 31.
  The central portion of the orbiting scroll 3 is provided with an opening 3a in which the eccentric portion 11a of the rotary shaft 11 is rotatably fitted, and the periphery of the opening 3a is the eccentric portion 11a of the rotary shaft 11. Is surrounded by wraps 26a and 27a (FIG. 9).
[0028]
  The fixed scroll wrap 6 and the orbiting scroll 3 wrap 26 correspond to the sealed space R formed by the fixed scroll wrap 7 and the orbiting scroll 3 wrap 27 for introducing the gas ballast gas. A communication hole 3e is formed between the sealed space L and the gas entering from the introduction pipe 10 so that the sealed space L is filled from the sealed space R through the communication hole 3e.
[0029]
  In addition, fans 12 and 13 for cooling the vacuum pump are provided on the outer side of the housing 5 and on both ends of the rotating shaft 11 on the outer side of the housing 4. Covers 18 and 19 having 18 a are attached to the housings 5 and 4.
  A shielding plate 29B having a large number of opening holes 29Ba and 29Bb (FIG. 7) between the cover 18 and the housing 5 is provided, and a plurality of opening holes 29Aa and 29Ab (see FIG. 7) are provided between the cover 19 and the housing 4. The shielding plate 29A which opened 6) is attached.
  Further, as described above, one end is supported by the housing 4 on the outer peripheral portion of the orbiting scroll, and the other ends of the three pairs of revolution mechanisms 17 are supported at three positions in the circumferential direction by 120 °, via the revolution mechanism 17. The fixed scroll is arranged to revolve with an eccentric rotation center.
[0030]
  Next, the operation of the present embodiment configured as described above will be described with reference to FIGS. 9A to 12A are views seen from the AA direction in FIG. 8, and FIG. 9B is a view seen from the BB direction.
  In FIG. 5, when the rotary shaft 11 rotates, the orbiting scroll 3 revolves, sucks gas from a container (not shown), and draws gas from the outer periphery of the fixed scroll wraps 6 and 7 by the orbiting scroll wraps 26 and 27. After being taken into a sealed space formed by the wrapping of the fixed scroll and the orbiting scroll, compressed by this sealed space, and compressed by three or more sealed spaces, the R0 sealed space shown in FIG. , The introduction hole 4e from the introduction pipe 10 is opened.
[0031]
  At this time, when the pressure in the container to be evacuated is close to the external atmospheric pressure, the internal pressure of the sealed space R1 into which the gas is introduced from the introduction hole is already higher than the external atmosphere, and the gas ballast introduction pipe 10 is used. When the pressure of the gas introduced from the above is lower than the internal pressure, no gas is introduced through the introduction hole 4e.
  By the revolution driving of the orbiting scroll, the sealed spaces R and L are changed to R1, L1 (FIG. 9), R2, L2 (FIG. 10), R3, L3 (FIG. 11), R4, L4 (FIG. 12) and compressed gas. Is discharged from the discharge hole 4c.
[0032]
  Therefore, if the gas in the container already contains water vapor at the time of the spaces R1 and L1, the final sealed spaces R4 and L4 have a saturated vapor pressure or higher, and the vapor condenses and liquefies to form the final sealed space. Moisture accumulates by adhering to the inner wall of the wrap.
[0033]
  If the water vapor is already liquefied before reaching the spaces R1 and L1, some water flows back from the fixed scroll introduction hole 4e to the introduction pipe 10, but the introduction hole 4e is narrow and the gas for gas ballast is used. Therefore, the amount of moisture that enters the introduction tube 10 is extremely small.
[0034]
  When the pressure in the container to be evacuated decreases, the moisture in the container is vaporized, but the internal pressure of the sealed spaces R1 and L1 into which gas is introduced from the introduction hole for gas ballast reaches the sealed space. Even if the fluid taken in is compressed, the pressure of the gas introduced from the introduction hole is lower than that, and the gas is introduced from the introduction hole.
[0035]
  At this time, the ratio of water vapor in the introduced gas decreases. And the fluid containing the said water vapor | steam is compressed to R2, L2 (FIG. 10), R3, and L3 (FIG. 11).
  At this time, the pressure of the compressed fluid in this space becomes larger than the pressure of the gas for gas ballast, but the introduction hole 4e has a small diameter, the driving speed of the orbiting scroll is high, and the gas for gas ballast exists. The compressed fluid that flows backward from the introduction hole 4e is small, and the introduction hole 4e of the fixed scroll is closed by the orbiting scroll wrap 27a immediately before the sealed space is connected to the discharge hole 4c in R4 and L4 (FIG. 12).
[0036]
  Then, when the space is compressed and connected to the discharge hole (FIG. 12), the water vapor partial pressure is reduced to be equal to or lower than the saturated vapor pressure of the scroll pump, without being liquefied, and the condensed and liquefied wrap. The water adhering to the wall is vaporized and discharged from the discharge hole.
[0037]
  On the other hand, the spaces S0 (a) and T0 (b) shown in FIG. 12 are compressed as S1 (a) and T1 (b) as shown in FIG. 9 when the rotary shaft 11 rotates 90 °. There is no introduction hole for gas ballast in the space. Then, the spaces S3 and T3 in FIG. 11 communicate with the discharge holes 4c through S2 and T2 in FIG. 10, and the compressed fluid is discharged to the outside. Therefore, in this process, the saturated vapor pressure is exceeded, the vapor may condense and liquefy, and may adhere to the inner wall of the wrap forming the final sealed space and accumulate moisture.
[0038]
  Even in this case, the spaces R4 and L4 (FIG. 12) communicating with the gas ballast introduction pipes are connected to the discharge holes 4c after discharging the compressed fluid in the spaces S3 and T3 from the discharge holes 4c. A compressed gas having a low pressure and not exceeding the saturated vapor pressure of the scroll pump is discharged from the discharge hole while vaporizing the condensed and liquefied water in the spaces S3 and T3.
[0039]
  The scroll fluid machine that operates as described above continuously compresses fluid taken from the periphery toward the central portion, and the central portion is compressed to the maximum, and therefore, the central portion has the highest temperature.
  Next, the structure of the cooling means for cooling the central portion will be described.
  FIG. 1 is a first embodiment diagram showing an assembly structure of a rotating shaft and a fan of a scroll fluid machine according to an embodiment of the present invention. In the figure, a cooling passage 11Ad for introducing an external gas from the opening 11Ag at the left end is cut along the rotation shaft center of the rotation shaft 11A, and the right end of the cooling passage 11Ad is shielded by a shielding plate 23.
[0040]
  In the right end portion 11Ab of the rotating shaft 11A, a plurality of opening holes 11Ac are opened radially from the cooling passage 11Ad toward the outer peripheral surface of the right end portion 11Ab, and the opening holes 11Ac are fitted and fixed to the right end portion 11Ab. 13 is communicated with the opening hole 13a provided in the fitting portion 20A, and the cooling gas cooled in the cooling passage 11Ad can be exhausted from the opening hole 13a to the outside as indicated by an arrow 34 by the rotation of the fan 13. ing.
[0041]
  A fitting portion 20B of the fan 12 that fits to the left end portion 11Ae is fixed to the left end portion 11Ae of the rotating shaft 11A by a nut 22 on the tip screw portion 11Af, and the shielding plate 29B (FIG. The cooling gas that has cooled the non-wrap surface (FIG. 5) of the housing 5 can be exhausted to the outside as indicated by an arrow 39 through the opening hole 29Ba opened in 7).
[0042]
  Since the cooling gas 32 passes through the cooling passage 11Ad, the central portion of the orbiting scroll 3 is cooled, and the gas contributing to the cooling passes from the communication hole 11Ac to the opening hole of the shielding plate 29A. The air is forcibly exhausted by the fan 13 through 29Ab (FIG. 6).
[0043]
  FIG. 2 is a second embodiment diagram showing an assembly structure of a rotating shaft and a fan of a scroll fluid machine according to an embodiment of the present invention.
  In the figure, a cooling passage 11Bd for introducing an external gas from the opening 11Bg at the left end along the rotation axis center of the rotation shaft 11B, and a groove 11Bh are cut in a spiral shape on the inner peripheral surface of the passage 11Bd. The right end of 11Bd is shielded by a shielding plate 23.
[0044]
  In the right end portion 11Bb of the rotating shaft 11B, a plurality of opening holes 11Bc are opened radially from the cooling passage 11Bd toward the outer peripheral surface of the right end portion 11Bb, and the opening holes 11Bc are fitted and fixed to the right end portion 11Bb. 13 is communicated with the opening hole 13a provided in the fitting portion 20A, and the cooling gas cooled in the cooling passage 11Bd by the rotation of the fan 13 can be discharged from the opening hole 13a to the outside as indicated by an arrow 34. ing.
[0045]
  A fitting portion 20B of the fan 12 fitted to the left end portion 11Be is fixed to the screw portion 11Bf at the tip end by a nut 22 at the left end portion 11Be of the rotating shaft 11B, and the shielding plate 29B (see FIG. The cooling gas that has cooled the anti-wrap surface (FIG. 5) of the housing 5 can be exhausted to the outside as indicated by an arrow 39 through the opening hole 29Ba opened in 7).
[0046]
  Since it is configured in this way, the cooling gas 32 passes through the cooling passage 11Bd to cool the central portion of the orbiting scroll 3. At this time, the cooling introduced by the spirally formed groove 11Bh Since the turbulent flow forming means for stirring the working gas is provided, the temperature difference of the gas between the vicinity of the inner wall surface of the cooling passage and the central portion is quickly reduced, and efficient cooling can be performed.
  The turbulent flow forming means may insert a spiral coil spring in the cooling passage 11Bd.
  Further, a mixing pipe that mixes two liquids with the inner diameter of the cooling passage 11Bd as the outer diameter may be inserted into the cooling passage 11Bd.
[0047]
  FIG. 3 is a reference example diagram showing an assembly structure of a rotating shaft and a fan of a scroll fluid machine according to a reference example of the present invention, and FIG. 4 is a structural diagram of a heat pipe used in the reference example.
  More specificallyFIG. 3 shows an assembly structure of a rotating shaft and a fan of a scroll fluid machine according to a reference example of the present invention.Reference exampleFIG. In the figure, a hollow path 11Cd is cut along the rotation axis center of the rotation shaft 11C, and heat pipes 24A and 24B are arranged in the hollow path 11Cd.
[0048]
  The fitting portion 21A of the fan 13 is fitted and fixed to the right end portion 11Cb of the rotating shaft 11C, and the cooling gas that has cooled the heat radiating portion 25c of the heat pipe 24A can be discharged to the outside as indicated by the arrow 36 by the rotation of the fan 13. It is configured.
  A fitting portion 21B of the fan 12 fitted to the left end portion 11Ce is fixed to the left end portion 11Ce of the rotating shaft 11C by a nut 22 by a nut 22 and the heat pipe 24B dissipates heat by the rotation of the fan 12. The cooling gas that has cooled the portion 25c can be discharged to the outside as indicated by an arrow 36.
[0049]
  As shown in FIG. 4, the pair of heat pipes 24 </ b> A and 24 </ b> B includes a wick structure 28 provided in a sealed container 25 formed of copper, stainless steel, nickel, tungsten, molybdenum, and the like, and the wick structure. 28 is composed of an inner space 25d surrounded by 28, and a working fluid that changes between the wick structure 28 and the inner space 25d by heating and cooling, vaporizes and liquefies, and circulates by the evaporator 25a. Heat is received from the center of the scroll 3 and the working liquid is vaporized, and moves to a condensing part (heat dissipating part) 25c as indicated by an arrow 37. Return to the working fluid.
[0050]
  The pair of heat pipes 24A and 24B configured as described above are arranged in the hollow cooling passage 11Cd.Reference exampleThe rotating shaft 11C according to FIG. 3 is generated by the orbiting scroll 3 in each one end side heating section (evaporating section) 25a of the container 25 forming the pair of heat pipes 24A and 24B located on the center side of the rotating shaft 11C in FIG. Heat is absorbed and the working liquid in the heat pipe is evaporated and vaporized, and this vaporized gas is caused by external gas sucked as arrows 35 and 35 in the fans 12 and 13 in the respective condensing portions 25c located on both ends of the rotating shaft 11C. Cool and liquefy.
[0051]
  The external gas contributing to the cooling is discharged to the outside as arrows 36 and 36 through the opening holes 29Ab and 29Bb of the shielding plates 29A and 29B (FIGS. 6 and 7).
  In addition, the gas that has cooled the opposite lap surfaces of the housings 4 and 5 in which the fixed scroll wraps are implanted passes through the opening holes 29Aa and 29Ba of the shielding plates 29A and 29B (FIGS. 6 and 7), and the arrows 39 and 40 (FIG. As 8), the central part of the orbiting scroll 3 is discharged to the outside together with the cooled gas.
[0052]
  The heat transport amount of the heat pipe 24 can be several hundred times larger than that of metals such as copper and aluminum having good thermal conductivity, so that the central part of the orbiting scroll is efficiently cooled. be able to.
  In addition, the heat pipe is formed in a hollow interior, and the wick structure and the operating liquid are only disposed on the hollow peripheral surface, so that it is lightweight, with a small temperature difference at a location away from the heat source. In addition, heat can be transferred very quickly, and efficient cooling of the central portion can be performed.
  In addition, the heat transfer amount can be easily set by designing the heat insulating part 25b as appropriate and designing the size and shape of the evaporation part 25a and the condensing part 25c.
[0053]
  Next, an improved embodiment of the first embodiment showing the assembly structure of the rotating shaft and the fan of the scroll fluid machine according to the embodiment of the present invention will be described. FIG. 13 relates to the improvement of FIG. 1 which is the first embodiment, and includes a small-diameter portion 11Dk formed of a cylinder having a cooling passage 11Dd through which cooling gas is conducted at the center and a cooling passage 11Dd having the same diameter. A cooling passage between each other, with an eccentric portion 11Da formed of a large-diameter cylinder having an inner space 11Dj having a larger diameter than the cooling passage 11Dd between the intermediate-diameter portion 11Db formed of a cylinder having The inner peripheral surface of 11Dd and the inner peripheral surface of the space 11Dj are aligned with the line MM, and the connecting ends of the respective cylinders are brazed as 40A to 40d to constitute the rotating shaft 11D.
[0054]
  With this configuration, when the rotation shaft 11D rotates, the internal space 11Dj of the eccentric portion 11Da rotates, and the cooling gas introduced from the cooling passage 11Dd spreads to the eccentric portion in the space 11Dj portion. The gas in the portion is pushed by the inner peripheral surface of the eccentric portion of the space, turbulent flow is generated, and heat exchange can be performed efficiently.
[0055]
  Next, an improved embodiment of the second embodiment showing the assembly structure of the rotating shaft and fan of the scroll fluid machine according to the embodiment of the present invention will be described. FIG. 14 relates to the improvement of FIG. 2, which is the second embodiment, and includes a small diameter portion 11Ek formed of a cylinder having a cooling passage 11Ed through which cooling gas is conducted at the center and a cooling passage 11Ed having the same diameter. A cooling passage between each other with an eccentric portion 11Ea formed of a large-diameter cylinder having an inner space 11Ej having a larger diameter than the cooling passage 11Ed between the middle-diameter portion 11Eb formed of a cylinder having The inner peripheral surface of 11Ed and the inner peripheral surface of the space 11Ej are aligned with the line N-N, and the connecting ends of the cylinders are brazed as 40A to 40d, and the spiral groove 11Eh is cut to remove the rotating shaft 11E. It is composed.
[0056]
  With this configuration, when the rotating shaft 11E rotates, the cooling gas introduced from the cooling passage 11Ed by the spiral groove 11Eh generates turbulent flow, and the internal space 11Ej of the eccentric portion 11Ea rotates. The cooling gas spreads to the eccentric part in the space 11Ej, and the gas in the part is pushed by the inner peripheral surface of the eccentric part of the space, turbulence is increased, and heat exchange can be performed efficiently.
  As described in the second embodiment, as the turbulent flow forming means, a spiral coil spring may be inserted into the cooling passage 11Ed, and the inner diameter of the cooling passage 11Ed is the outer diameter. Of course, a mixing pipe that mixes two liquids may be inserted into the cooling passage 11Ed.
[0057]
  Next, an improved embodiment of the third embodiment showing the assembly structure of the rotating shaft and the fan of the scroll fluid machine according to the embodiment of the present invention will be described. FIG.Reference example3 in which the hollow channel 11Fr is centered on a line Q inclined at an angle α from the rotation axis center line P toward the eccentric part 11Fa from both ends of the rotation axis 11F. 11Fl is cut and heat pipes 24A and 24B are disposed in the hollow paths 11Fr and 11Fl.
[0058]
  The fitting portion 21A of the fan 13 is fitted and fixed to the right end portion 11Fb of the rotating shaft 11F, and the cooling gas that has cooled the heat radiating portion 25c of the heat pipe 24A can be discharged to the outside as indicated by the arrow 36 by the rotation of the fan 13. It is configured.
  A fitting portion 21B of a fan 12 fitted to the left end portion 11Fe is fixed to the left end portion 11Fe of the rotating shaft 11F by a nut 22 and fixed to the screw portion 11Ff at the tip end, and the heat pipe 24B dissipates heat by the rotation of the fan 12. The cooling gas that has cooled the portion 25c can be discharged to the outside as indicated by an arrow 36.
[0059]
  This embodiment configured as described above isReference exampleThe heat exchange is performed by the operation described in the above.
  That is, the heat generated by the orbiting scroll 3 is absorbed by the one end side heating unit (evaporating unit) 25a of each of the heat pipes 24A and 24B, the working liquid in the heat pipe is evaporated and evaporated, and the vaporized gas is condensed into the condensing unit 25c. Are cooled and liquefied by the external gas sucked by the fans 12 and 13 as arrows 35 and 35.
[0060]
  The external gas contributing to the cooling is discharged to the outside as arrows 36 and 36 through the opening holes 29Ab and 29Bb of the shielding plates 29A and 29B (FIGS. 6 and 7).
  In addition, the gas that has cooled the opposite lap surfaces of the housings 4 and 5 in which the fixed scroll wraps are implanted passes through the opening holes 29Aa and 29Ba of the shielding plates 29A and 29B (FIGS. 6 and 7), and the arrows 39 and 40 (FIG. As 8), the central part of the orbiting scroll 3 is discharged to the outside together with the cooled gas.
[0061]
  In the above heat exchange process, since the hollow paths 11Fr and 11Fl are inclined with respect to the center line P in the present embodiment, the heating unit 25a rotates eccentrically about the center line P, and generates centrifugal force. In addition, the working liquid liquefied in the condensing part 25c on both ends of the rotating shaft 11C is pulled up to the heating part, and the circulation of the working liquid is promoted to improve the cooling effect.
  Therefore, in this embodiment, it can be used not only in a heat pipe having a capillary action working fluid recirculation method but also in a rotary heat pipe using centrifugal force, and its use range is wide.
[0062]
  In the above-described embodiment, as shown in FIG. 5, the description has been made with the combination of the double wrap orbiting scroll in which the orbiting wrap is implanted on both surfaces of the end plate and the fixed scroll. However, the present invention is not limited to this. Rather, it is also applied to a combination of a single wrap orbiting scroll in which a swirl wrap is installed on one surface of an end plate and a fixed scroll. In this case, there is a fixed scroll near the fan. Of course, there are a method of positioning and a method of positioning the orbiting scroll, and it is possible to exhaust the gas that has cooled the anti-wrap portion of the fixed scroll or the orbiting scroll together with the cooling of the heat pipe by the fan.
[0063]
  In the present embodiment, a fan is disposed at the end of the rotating shaft, and a communication hole is formed at the other end of the cooling passage toward the outer periphery of the rotating shaft so that the gas contributed to cooling by the fan. The central portion of the orbiting scroll is cooled by forcibly exhausting the gas from the communication hole, and other than the central portion is cooled by the gas that does not pass through the communication hole.
  That is, the cooling gas 32 passes through the cooling passages 11Ad (FIG. 1) and 11Bd (FIG. 2), thereby cooling the central portion of the orbiting scroll 3, and the gas contributing to this cooling is connected to the communication hole 11Ac (FIG. 1). , 11Bc (FIG. 2) is forcibly exhausted by the fan 13.
  The fan 13 further exhausts the gas that has cooled the back surface of the housing 4, which is a fixed scroll in which the wrap 7 is implanted, as indicated by an arrow 40.
  Therefore, not only the center part of the orbiting scroll but also other parts are cooled, and efficient cooling can be performed.
[0064]
  As described above, this embodiment can directly cool the rotating shaft, so that the orbiting scroll is orbitally driven by the rotating shaft connected to the driving source at the center of the end plate, and the fluid taken in from the peripheral portion of the scroll. The heat generated in the process of being sequentially compressed and transferred to the central part can be cooled at the highest central part, bearings and seal members provided around the central part of the orbiting scroll, bearings around the rotating shaft, The seal member can be efficiently cooled.
  Further, the difference due to thermal expansion between the fixed scroll and the orbiting scroll can be eliminated, the temperature distribution can be made constant, the galling of the wrap can be prevented, and the grease maintenance period can be extended, so that the durability can be improved.
  In addition, the clearance of each scroll can be reduced by reducing the heat generation, and the ultimate pressure can be improved by performing high speed operation.
[0065]
  Further, in the above-described embodiment, the opening portion of the introduction hole for gas ballast is provided on the lap sliding surface of the orbiting scroll, the opening hole diameter of the opening portion is formed smaller than the wrap width, and the orbiting scroll. The opening of the introduction hole can be opened and closed by lap driving, and the opening of the introduction hole is closed in synchronization with the timing when the final sealed space formed by the fixed scroll and the orbiting scroll is connected to the discharge passage to the outside. Therefore, when the final sealed space is connected to the discharge passage, the gas ballast is blocked from the introduction hole, and the compressed fluid is prevented from flowing back to the introduction hole. Is discharged to the outside from the discharge passage.
  Therefore, the compressed fluid can be prevented from backflowing with a simple configuration in which the introduction hole opening is set to have a diameter smaller than the wrap width, and there is no need to provide a special check valve at the gas introduction hole.
[0066]
  Further, wraps are respectively formed on the front and back surfaces of the plate of the orbiting scroll, and the orbiting scroll is provided so as to be capable of being orbitally driven by the first fixed scroll and the second fixed scroll having laps fitted to these wraps. A gas ballast introduction hole is provided in one fixed scroll of the first fixed scroll and the second fixed scroll, and the gas is sent to a sealed space formed by the other fixed scroll in the orbiting scroll plate. Since a hole is opened, a discharge hole is provided in the one fixed scroll, and the compressed fluid in the sealed space is compressed together with the gas and discharged to the outside, the introduction hole is formed in one fixed scroll. And a discharge hole for the compressed fluid is provided. Centrally located opposite the portion of the lap Lumpur side than arranged with them dispersed in one and the other of the fixed scroll, it is easy construction simplifies manufacturing.
[0067]
  Further, the gas introduced from the introduction hole for gas ballast into the sealed space formed by one lap of the orbiting scroll and the one of the fixed scroll wraps through the communication hole provided in the plate of the orbiting scroll. Since it is introduced into the other sealed space formed by the other wrap of the orbiting scroll and the wrap of the other fixed scroll, there is no need to provide an introduction hole for introducing gas for gas ballast in both the fixed scrolls. Since the introduction hole may be provided in one fixed scroll, the structure is simple and the manufacture becomes easy.
[0068]
  The present embodiment can be variously modified.
  As described above, the gas from the gas ballast introduction hole is introduced into the R space and the L space, but the gas ballast gas is not necessarily limited to this, and the gas ballast gas is introduced into the S space and the T space. You may comprise.
  Further, the gas ballast introduction pipe 10 and the discharge passages 4c and 4d are attached to the housing 4 side, but they may be provided on the housing 5 side.
  Gas for gas ballast may be introduced from both the housings 4 and 5 into both spaces R and L formed by turning and fixed scroll wraps. In that case, the introduction hole 3e that communicates the spaces R and L is not necessary, and the gas ballast gas is rapidly introduced from both, so that the efficiency is improved.
  Of course, the discharge passage may be provided on the housing 5 side as well as 4c and 4d on the housing 4 side.
[0069]
  Further, the gas for gas ballast may be introduced from the introduction pipe 10 into the external atmosphere, but air or N₂ It is desirable to introduce heat by applying heat to the isodry gas. In this case, drying of vapor or liquid in the scroll wrap is accelerated, and prevention of deterioration is promoted.
  In addition, in this embodiment, when harmful gas is sucked from the container, N₂ It is possible to dilute harmful gases to safety standards by introducing dilution gases such as
[0070]
【The invention's effect】
  As described above, since the present invention has a structure with good cooling efficiency, it is possible to prevent galling of the lap and to extend the grease maintenance period, thereby improving durability.
  In addition, the clearance of each scroll can be reduced by reducing the heat generation, and the ultimate pressure can be improved by performing high speed operation. Etc.
[Brief description of the drawings]
FIG. 1 is a first embodiment diagram showing an assembly structure of a rotating shaft and a fan of a scroll fluid machine according to an embodiment of the present invention.
FIG. 2 is a view of a second embodiment showing an assembly structure of a rotating shaft and a fan of a scroll fluid machine according to an embodiment of the present invention.
FIG. 3 of the present inventionReference exampleShows the assembly structure of the rotating shaft and fan of the scroll fluid machineFigureIt is.
[Fig. 4]Used in FIG.It is a structural diagram of a heat pipe.
FIG. 5 is an assembly structure diagram of the scroll fluid machine according to the embodiment of the present invention.
6 is a view seen from the CC direction of FIG.
7 is a view as seen from the DD direction in FIG. 5;
FIG. 8 is a partially enlarged view of FIG. 1;
FIG. 9 is a schematic view showing a scroll state in which introduction of gas for gas ballast is started.
FIG. 10 is a schematic view showing a state of a scroll in which gas for gas ballast is introduced.
FIG. 11 is a schematic view showing a scroll state immediately before the introduction of gas for gas ballast is completed.
FIG. 12 is a schematic view showing a scroll state in which a gas introduction hole for gas ballast is closed.
FIG. 13 is a view showing an improved embodiment of the first embodiment showing the assembly structure of the rotating shaft and the fan of the scroll fluid machine according to the embodiment of the present invention.
FIG. 14 is a view showing an improved embodiment of the second embodiment showing the assembly structure of the rotating shaft and the fan of the scroll fluid machine according to the embodiment of the present invention.
FIG. 15 shows the present invention.Reference example3 shows the assembly structure of the rotary shaft and fan of the scroll fluid machine according to FIG.FigureIt is a figure which shows the improvement Example of these.
FIG. 16 is a conventional example showing a non-driving unit cooling method.
FIG. 17 is a conventional example showing a drive unit cooling system.
[Explanation of symbols]
  1 Pump body
  3 Orbiting scroll
  4, 5 housing
  6, 7, 26, 27 lap
  8 Suction port
  9 Discharge port
  10 Introduction pipe
  11 Rotating shaft (11A, 11B, 11C, 11D, 11E)
  12, 13 fans
  14 Tip seal
  15,16 packing
  18, 19 cover
  20 Bearing (20A, 20B)
  21 Bearing (21A, 21B)
  24 heat pipe (24A, 24B)
  25 containers
  28 Wick structure
  29 Shield plate (29A, 29B)

Claims (3)

A fixed scroll in which a spiral wrap is implanted from the central portion of the end plate toward the outer periphery, and a rotating shaft connected to a driving source in the central portion of the end plate in which the spiral wrap is fitted. In a scroll fluid machine equipped with a turning scroll that is driven to turn,
A hollow cooling passage is formed in the rotating shaft, and a fan is disposed at an end of the rotating shaft so that a cooling gas is introduced from one end of the rotating shaft and exhausted from the other end. A communication hole is formed at the other end of the passage to conduct toward the outer periphery of the rotary shaft, and the central portion of the orbiting scroll is cooled by forcibly exhausting the gas that contributes to cooling from the communication hole by the fan. A scroll fluid machine configured to cool a portion other than the central portion with a gas that does not pass through the communication hole.   The scroll fluid machine according to claim 1, wherein the fan is disposed at the other end or both ends of the rotating shaft.   2. The scroll fluid machine according to claim 1, wherein turbulent flow forming means for stirring the introduced cooling gas is provided in the cooling passage.

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