WO2024047989A1 - Compresseur - Google Patents

Compresseur Download PDF

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Publication number
WO2024047989A1
WO2024047989A1 PCT/JP2023/020890 JP2023020890W WO2024047989A1 WO 2024047989 A1 WO2024047989 A1 WO 2024047989A1 JP 2023020890 W JP2023020890 W JP 2023020890W WO 2024047989 A1 WO2024047989 A1 WO 2024047989A1
Authority
WO
WIPO (PCT)
Prior art keywords
compressor
piston
hole
resin
connecting rod
Prior art date
Application number
PCT/JP2023/020890
Other languages
English (en)
Japanese (ja)
Inventor
伸之 成澤
浩介 須藤
Original Assignee
株式会社日立産機システム
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立産機システム filed Critical 株式会社日立産機システム
Publication of WO2024047989A1 publication Critical patent/WO2024047989A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00

Definitions

  • the present invention relates to a compressor.
  • the compressor has a reciprocating compression system that converts the rotary motion of the prime mover into reciprocating motion via the crankshaft and connecting rod (hereinafter referred to as the connecting rod), causing the piston to reciprocate and compress the fluid sucked into the cylinder.
  • the connecting rod connecting rod
  • reciprocating compressors There are two types of reciprocating compressors: a normal piston type in which a piston is swingably attached to a connecting rod via a bearing, and a swinging piston type in which a piston is directly attached to a connecting rod.
  • the latter type of oscillating piston type has a simpler structure than the normal piston type because it does not have a bearing or piston pin, and there are no design restrictions regarding bearing temperature to ensure lubrication.
  • the mass of moving parts can be reduced.
  • Patent Document 1 discloses a compressor in which a piston whose compression chamber side is made of resin is fixed to a connecting rod from the crankcase side with a screw. Inserting the screw from the crankcase side in this manner prevents the screw from being heated by the high temperature compressed gas in the compression chamber. This makes it possible to suppress creep deformation of the resin of the piston around the screw, thereby suppressing the occurrence of loosening of the screw.
  • the piston of Patent Document 1 has an insert structure in which a metal insert part is embedded inside a resin, and the insert part is connected to a connecting rod with a screw.
  • the insert part is provided with a shape in which the edge located on the connecting rod side bites into the resin, and when a vertical load is applied to the piston, the insert member and the resin are separated by the edge. It's suppressed.
  • the load acting on the piston is not limited to the vertical direction.
  • the technique of Patent Document 1 has room for improvement regarding the structure of the insert component on the compression chamber side.
  • An object of the present invention is to provide a compressor that can further suppress a decrease in the strength of a piston caused by a difference in thermal expansion between the resin and the insert component.
  • the present invention provides a compressor in which a piston supported by a connecting rod reciprocates within a cylinder while rocking, the piston having at least a surface that contacts an inner circumferential wall of the cylinder.
  • the compressor includes a resin forming a surface on the compression chamber side, an insert part embedded inside the resin, and a through hole provided in the insert part and filled with the resin.
  • FIG. 1 is a schematic side view of a compressor according to a first embodiment of the present invention. 1 is a partially sectional view showing the configuration of a compressor main body according to a first embodiment of the present invention.
  • FIG. 2 is a schematic side view of a connecting rod and a piston fixed to the small end of the connecting rod of the compressor according to the first embodiment of the present invention.
  • 4 is a sectional view taken along line IV-IV in FIG. 3.
  • FIG. FIG. 1 is a perspective view of an insert component according to a first embodiment of the present invention. 5 is a sectional view taken along line VI-VI in FIG. 4.
  • FIG. FIG. 3 is a schematic side view of a piston according to a second embodiment of the present invention.
  • FIG. 7 is a schematic side view of a connecting rod of a compressor and a piston fixed to a small end of the connecting rod according to a third embodiment of the present invention.
  • FIG. 7 is an exploded perspective view of a connecting rod and a piston according to a third embodiment of the present invention.
  • FIG. 9 is a sectional view taken along line XX in FIG. 8; 11 is a sectional view taken along line XI-XI in FIG. 10.
  • FIG. 9 is a schematic cross-sectional view taken along line XX in FIG. 8.
  • FIG. It is a back perspective view of the insert component based on 4th Embodiment of this invention.
  • compressors according to the first to fourth embodiments of the present invention will be explained using the drawings.
  • the compressor of the present invention can be applied to various compressors that employ a swinging piston type among compressors that compress various fluids such as air and refrigerant, and the type, model, and application thereof are not particularly limited.
  • FIG. 1 is a schematic side view of a compressor 10 according to a first embodiment of the present invention.
  • the compressor 10 includes a compressor body 1, an electric motor 2 that drives the compressor body 1, a tank 3 that stores fluid discharged by the compressor body 1, a compressor pulley 4, and an electric motor. It includes a pulley 5 and a transmission belt 6.
  • FIG. 2 is a partial cross-sectional view showing the configuration of the compressor main body 1 according to the first embodiment of the present invention.
  • the compressor main body 1 is a device that compresses fluid, and as shown in FIG. have.
  • FIGS. 1 and 2 show a case where the compressor 10 is a one-cylinder, one-stage compressor that includes a pair of pistons and cylinders.
  • the present invention is not limited thereto, and the compressor 10 may include a plurality of pairs of pistons and cylinders.
  • the compressor main body 1 is arranged and fixed on the tank 3 so that the crankshaft 24 and the rotation axis of the electric motor 2 are arranged in parallel.
  • a compressor pulley 4 is attached to the crankshaft 24, and an electric motor pulley 5 is attached to the rotating shaft of the electric motor 2.
  • a transmission belt 6 for transmitting the power of the electric motor 2 to the compressor body 1 is wound around the compressor pulley 4 and the electric motor pulley 5.
  • the compressor main body 1 is connected to the electric motor 2 via the electric motor pulley 5, the transmission belt 6, and the compressor pulley 4.
  • the invention is not limited to this, and the crankshaft 24 of the compressor main body 1 and the rotating shaft of the electric motor 2 may be directly connected, for example, using a shaft joint.
  • the compressor pulley 4 may be provided with blades. The blades rotate with the rotation of the compressor pulley 4 and generate cooling air toward the compressor body 1, thereby cooling the compressor body 1.
  • FIG. 3 is a schematic side view of the connecting rod 32 of the compressor 10 according to the present embodiment and the piston 33 fixed to the small end 32b of the connecting rod 32. As shown in FIG. 3, the piston 33 is fixed to the tip of the small end 32b of the connecting rod 32 with a screw 35 (a hexagon socket head bolt in this embodiment).
  • the piston 33 has at least an outer circumferential surface 33a that contacts the inner circumferential wall 22a (see FIG. 2) of the cylinder 22, and an upper surface 33c exposed within the compression chamber 22b (see FIG. 2) of the cylinder 22, which are made of resin 36. There is.
  • a piston ring 34 is attached to the piston 33. Further, it is preferable that the outer circumferential surface 33a of the piston 33 is a spherical surface having a diameter slightly smaller than the diameter of the inner circumferential side of the cylinder 22.
  • FIG. 4 is a cross-sectional view taken along IV-IV in FIG. 3.
  • the piston 33 includes a resin 36 and an insert component 41 embedded inside the resin 36.
  • the resin 36 and the insert component 41 are integrally molded by insert molding.
  • the resin 36 it is preferable to use, for example, polytetrafluoroethylene (PTFE), which has excellent abrasion resistance, or polyphenylene sulfide (PPS), which has excellent thermal expansion coefficient.
  • PTFE polytetrafluoroethylene
  • PPS polyphenylene sulfide
  • a ring groove 33b for mounting the piston ring 34 is provided in the resin 36. Note that the piston ring 34 may not be used. In this case, the ring groove 33b is not provided in the resin 36.
  • the piston 33 is provided with an annular portion 33d that annularly covers a portion of the insert part 41 on the connecting rod 32 side with the resin 36.
  • the annular portion 33d is connected to the resin forming the outer peripheral surface 33a of the piston 33.
  • annular portion 33d fits into an annular groove 32e provided in the small end 32b of the connecting rod 32. Thereby, the piston 33 can be positioned with respect to the small end 32b of the connecting rod 32.
  • FIG. 5 is a perspective view of the insert component 41 according to this embodiment.
  • the insert component 41 is a border hat-shaped member made of metal (for example, aluminum alloy), and has a cylindrical portion 41a, a lid portion 41b, a flange portion 41c, and a through hole 41d.
  • the upper opening of the cylindrical portion 41a is closed by the lid portion 41b, and the cylindrical portion 41a and the lid portion 41b form a cavity 41e (see FIG. 4) that opens on the lower side.
  • the flange portion 41c is an annular portion extending radially outward from the lower outer peripheral wall of the cylindrical portion 41a.
  • the outer peripheral wall of the cylindrical portion 41a, the upper surface of the lid portion 41b, the upper surface and side surfaces of the flange portion 41c, and the radially outer side of the lower surface of the flange portion 41c are covered with the resin 36.
  • the inner circumferential wall of the cylindrical portion 41a, the lower surface of the lid portion 41b, and the radially inner side of the lower surface of the collar portion 41c are not covered with the resin 36 and are exposed.
  • the through hole 41d is provided in the insert part 41, and the through hole 41d is filled with resin. As shown in FIG. 5, the four through holes 41d of this embodiment are linearly arranged in the groove 41f of the lid part 41b.
  • the groove 41f is formed along a groove 33f (see FIG. 3) provided on the upper surface 33c of the piston 33 to prevent the piston 33 from coming into contact with the suction valve plate 26a (see FIG. 2) provided on the valve plate 26.
  • This is a recessed portion of the lid portion 41b. Therefore, the lid portion 41b is thin with the groove 41f, and the through hole 41d can be easily provided therein.
  • the arrangement of the through holes 41d is not limited to the above, and many other arrangements can be considered.
  • the through holes 41d may be arranged along a direction intersecting the groove 41f so that the frictional resistance between the piston 33 and the cylinder 22 can accommodate the load that causes the resin 36 to be peeled off from the piston 33. Further, it is sufficient to have at least one through hole 41d.
  • the through hole 41d is separated from the center 41o of the insert component 41 by a predetermined distance D or more (see FIG. 5).
  • the predetermined distance D is the radius of the gate of the mold used when insert-molding the piston 33.
  • the through hole 41d includes a tapered portion 41g (see FIG. 4) whose diameter increases on the inside of the piston 33 (on the side of the cavity 41e).
  • the tapered portion 41g of this embodiment has a shape (chamfered shape) in which the opening of the through hole 41d provided on the lower surface of the lid portion 41b is widened.
  • the through hole 41d may include a tapered portion 41g whose diameter increases on the inside of the piston 33, and may also include a reverse tapered portion whose diameter increases on the opposite side, as shown in FIG. 5, for example.
  • the slope angle ⁇ (see FIG. 4) of the tapered portion 41g with respect to the inner wall of the through hole 41d is greater than 0 degrees and less than 60 degrees. This makes it possible to suppress the occurrence of cracks even when a resin with high edge sensitivity is used.
  • FIG. 6 is a sectional view taken along line VI-VI in FIG. 4.
  • the lower part of the insert component 41 is provided with a screw hole 41h that opens downward.
  • the small end portion 32b of the connecting rod 32 is provided with a through hole 32c that overlaps with the screw hole 41h.
  • the screw 35 inserted into the through hole 32c toward the piston 33 is preferably screwed into the screw hole 41h to fix the piston 33 to the connecting rod 32.
  • the small end 32b of the connecting rod 32 is provided with a recess 32f that opens upward.
  • the recess 32f preferably communicates with a cavity 41e provided in the insert component 41 and opening on the lower side.
  • a hollow portion 37 is formed between the piston 33 and the small end portion 32b of the connecting rod 32.
  • the piston 33 of the compressor 10 according to the present embodiment is provided in an insert part 41 embedded in the resin 36 that constitutes at least a surface 33a that contacts the inner circumferential wall 22a of the cylinder 22 and a surface 33c on the compression chamber 22b side.
  • a through hole 41d filled with resin 36 is provided.
  • the resin 36 that covers the compression chamber 22b side of the insert component 41 is bonded to the insert component 41 by the resin 36 that fills the through hole 41d provided in the insert component 41.
  • the piston 33 of the compressor 10 according to the present embodiment can suppress its deformation. can.
  • the through hole 41d provided in the insert component 41 is provided with the tapered portion 41g whose diameter increases on the inside of the piston 33 (on the side of the cavity 41e).
  • the resin 36 filled in 41d cannot move to the outside of the piston 33. Therefore, the piston 33 of the compressor 10 according to the present embodiment can further suppress peeling of the resin 36 covering the insert component 41 from the insert component 41.
  • the slope angle ⁇ of the tapered portion 41g with respect to the inner wall of the through hole 41d is greater than 0 degrees and less than 60 degrees. Therefore, the inclination angle of the tapered portion 36a (see FIG. 4) of the resin 36 filled in the through hole 41d is greater than 0 degrees and less than 60 degrees with respect to the side wall of the resin 36 filled in the through hole 41d. Thereby, it is possible to suppress the occurrence of cracks in the tapered portion 36a of the resin 36.
  • the through hole 41d is separated from the center 41o of the insert component 41 by a predetermined distance D or more, as shown in FIG. Therefore, when insert molding the piston 33, the through hole 41d can be provided outside the radius of the gate provided at a position overlapping the approximate center of the insert component 41 fixed to the mold. Thereby, occurrence of molding defects such as sink marks in the resin 36 can be suppressed. Therefore, it is possible to suppress the generation of a gap between the resin 36 and the insert component 41, which causes tensile stress to be generated in the resin 36 due to the pressure of the compression chamber 22b, and it is possible to suppress a decrease in the strength of the resin 36.
  • the mass of the reciprocating portion including the piston 33 and the connecting rod 32 can be reduced. Therefore, vibration of the compressor main body 1 caused by reciprocating inertia force can be suppressed.
  • the screw 35 that fixes the piston 33 to the connecting rod 32 is inserted into the through hole 32c of the connecting rod 32 toward the piston 33, and the connecting rod 35 provided in the insert part 41 of the piston 33 is inserted into the through hole 32c of the connecting rod 32.
  • the piston 33 is fixed to the connecting rod 32 by screwing into the screw hole 41h that opens on the side. Thereby, the screw 35 is not exposed in the compression chamber 22b, so that the screw 35 can be prevented from loosening due to the compression heat in the compression chamber 22b.
  • FIG. 7 is a schematic side view of a piston 233 according to a second embodiment of the invention.
  • the piston 233 according to this embodiment differs from the piston 33 according to the first embodiment in the position of the through hole 241d provided in the insert component 241.
  • the through hole 41d is provided in the lid portion 41b.
  • the piston 233 is provided at the flange 241c of the insert component 241 sandwiched between the resin 236.
  • FIG. 8 is a schematic side view of a connecting rod 332 and a piston 33 fixed to a small end 332b of the connecting rod 332 of a compressor according to a third embodiment of the present invention.
  • FIG. 9 is an exploded perspective view of the connecting rod 332 and piston 33 according to this embodiment.
  • FIG. 10 is a sectional view taken along line XX in FIG.
  • FIG. 11 is a sectional view taken along line XI-XI in FIG.
  • the connecting rod 332 according to this embodiment differs from the connecting rod 32 according to the first embodiment in that it includes communication holes (first communication hole 332g, second communication hole 332h) that communicate the inside and outside of the hollow part 37. .
  • the first communication hole 332g is a communication hole that is sandwiched between the radially extending groove 332i provided at the upper part of the small end portion 332b and the lower end 33e of the piston 33, and communicates between the inside and outside of the hollow portion 37. It opens on the inner peripheral wall 22a (see FIG. 2) side.
  • the second communication hole 332h is provided at the lower part of the small end 332b of the connecting rod 332, passes through the bottom surface 332j of the recess 332d, communicates between the inside and outside of the hollow portion 37, and opens toward the crankcase 21 side. .
  • the compressor according to this embodiment includes communication holes (first communication hole 332g, second communication hole 332h) that communicate the inside and outside of the hollow part 37, so that the heat accumulated in the hollow part 37 is transferred to the outside of the hollow part 37. can be released.
  • the compressor according to the present embodiment is provided with two or more communication holes (first communication hole 332g, second communication hole 332h), and at least one of the communication holes (first communication hole 332g) is connected to the cylinder. 22, and at least one other (second communication hole 332h) opens toward the crankcase 21 side.
  • crankcase 21 since the crankcase 21 breathes outside air through the breathing filter, cooling air equivalent to the outside temperature can be supplied into the hollow portion 37, and cooling efficiency can be further improved.
  • FIG. 13 is a rear perspective view of an insert component 441 according to a fourth embodiment of the present invention.
  • the insert component 441 according to the present embodiment is different from the insert component 41 according to the first embodiment in that a radiation fin is provided on the surface of the insert component 441 on the connecting rod 32 side (the lower surface 441h of the lid portion 441b of the insert component 441). 441j.
  • the radiation fins 441j of this embodiment are protruded from the lower surface 441h of the lid portion 441b of the insert component 441 toward the connecting rod 32, and are bonded to the inner wall 441k of the cylindrical portion 441a of the insert component 441, thereby increasing the strength. . Moreover, it is preferable that the radiation fins 441j are provided avoiding the through holes 441d.
  • the insert component 441 according to this embodiment has a radiation fin 441j on the surface (lower surface 441h) on the connecting rod 32 side. Therefore, the insert component 441 can be efficiently cooled, the thermal expansion of the insert component 441 can be reduced, and a decrease in the strength of the resin 36 covering the compression chamber 22b side of the insert component 441 can be further suppressed.
  • the present invention is not limited to the embodiments described above, and includes various modifications.
  • the embodiments described above are described in detail to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to having all the configurations described.
  • SYMBOLS 1 Compressor main body, 10... Compressor, 21... Crank case, 22... Cylinder, 22a... Inner peripheral wall, 22b... Compression chamber, 32, 332... Connecting rod, 32c... Through hole, 33, 233... Piston, 35... Screw , 36,236... Resin, 36a... Tapered part, 37... Hollow part, 41,241,441... Insert part, 41a... Cylindrical part, 41b, 441b... Lid part, 41c, 241c...
  • Flange part 41d, 241d, 441d ...Through hole, 41e...Gap, 41g...Tapered part, 41h...Screw hole, 41o...Center, 332g...First communication hole, 332h...Second communication hole, 441j...Radiation fin

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)

Abstract

L'invention concerne un compresseur (10) dans lequel un piston (33) supporté par une tige de liaison (32) effectue un mouvement de va-et-vient tout en oscillant à l'intérieur d'un cylindre (22), le piston (33) comprenant : une résine (36) constituant au moins une surface (33a) en contact avec une paroi périphérique interne (22a) du cylindre (22) et une surface (33c) sur un côté chambre de compression (22b) ; un composant d'insert (41) intégré dans la résine (36) ; et un trou de pénétration (41d) disposé dans le composant d'insert (41) et ayant la résine (36) remplie à l'intérieur de celui-ci.
PCT/JP2023/020890 2022-09-02 2023-06-05 Compresseur WO2024047989A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-139934 2022-09-02
JP2022139934A JP2024035464A (ja) 2022-09-02 2022-09-02 圧縮機

Publications (1)

Publication Number Publication Date
WO2024047989A1 true WO2024047989A1 (fr) 2024-03-07

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ID=90099261

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/020890 WO2024047989A1 (fr) 2022-09-02 2023-06-05 Compresseur

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JP (1) JP2024035464A (fr)
WO (1) WO2024047989A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5239071A (en) * 1975-09-23 1977-03-26 Akebono Brake Ind Co Ltd Improved piston in a liquid pressure
JPS60118825U (ja) * 1984-01-19 1985-08-10 オムロン株式会社 押しボタンスイツチ
JPS60184768A (ja) * 1984-02-07 1985-09-20 フエスト　カ−ゲ− ピストン
JPH0710615U (ja) * 1993-07-28 1995-02-14 エヌティエヌ株式会社 圧縮機用合成樹脂製ピストン
JP2005133696A (ja) * 2003-10-31 2005-05-26 Anest Iwata Corp 無給油式往復作動流体機械
WO2022158111A1 (fr) * 2021-01-20 2022-07-28 株式会社日立産機システム Compresseur

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5239071A (en) * 1975-09-23 1977-03-26 Akebono Brake Ind Co Ltd Improved piston in a liquid pressure
JPS60118825U (ja) * 1984-01-19 1985-08-10 オムロン株式会社 押しボタンスイツチ
JPS60184768A (ja) * 1984-02-07 1985-09-20 フエスト　カ−ゲ− ピストン
JPH0710615U (ja) * 1993-07-28 1995-02-14 エヌティエヌ株式会社 圧縮機用合成樹脂製ピストン
JP2005133696A (ja) * 2003-10-31 2005-05-26 Anest Iwata Corp 無給油式往復作動流体機械
WO2022158111A1 (fr) * 2021-01-20 2022-07-28 株式会社日立産機システム Compresseur

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