KR100426573B1 - Piston of closed compressor - Google Patents

Piston of closed compressor Download PDF

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Publication number
KR100426573B1
KR100426573B1 KR1019970073623A KR19970073623A KR100426573B1 KR 100426573 B1 KR100426573 B1 KR 100426573B1 KR 1019970073623 A KR1019970073623 A KR 1019970073623A KR 19970073623 A KR19970073623 A KR 19970073623A KR 100426573 B1 KR100426573 B1 KR 100426573B1
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South Korea
Prior art keywords
piston
cylinder
stepped
compressor
oil
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KR1019970073623A
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Korean (ko)
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KR19990053919A (en
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김동현
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엘지전자 주식회사
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    • 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
    • F04B39/0005—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 adaptations of pistons
    • 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
    • F04B39/02—Lubrication
    • F04B39/0284—Constructional details, e.g. reservoirs in the casing
    • F04B39/0292—Lubrication of pistons or cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/12—Kind or type gaseous, i.e. compressible
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps
    • Y10S417/902—Hermetically sealed motor pump unit

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

Abstract

PURPOSE: A piston of a closed compressor is provided to reduce wear caused by friction of the piston and a cylinder and to improve efficiency of the compressor by decreasing a friction area. CONSTITUTION: In a compressing mechanism of a closed compressor having a cylinder forming a compression space of coolant and a cylindrical piston(101) for reciprocating in the cylinder and sucking in, compressing, and discharging the coolant, the outer peripheral surface of the piston is axially stepped to supply oil a contact part of the piston and the cylinder. A stepped portion(101a) of the piston is a half of the circumference. The circumference of the piston section is divided into 8 parts and the parts adjacent to the stepped portions are not stepped. Oil flows to a spring in the rear side of the piston and prevents wear of a spring contact portion by leading front and rear sides of the piston by the stepped portion.

Description

밀폐형 압축기의 피스톤Piston of Hermetic Compressor

본 발명은 밀폐형 압축기의 피스톤에 관한 것으로서, 특히 피스톤과 실린더의 마모를 줄이기 위한 피스톤의 구조에 관한 것이다.The present invention relates to a piston of a hermetic compressor, and more particularly to a structure of a piston for reducing wear of the piston and the cylinder.

일반적인 밀폐형 압축기는 도 1 에 도시된 바와 같이, 하부밀폐용기(1b)와 상부밀폐용기(1a)로 이루어진 밀폐용기(1)내에 압축기구부와 이를 구동하는 전동기구부로 구성하였다.As shown in FIG. 1, the general hermetic compressor includes a compression mechanism part and an electric mechanism driving the same in the hermetic container 1 including the lower hermetic container 1b and the upper hermetic container 1a.

상기 전동기구부는 프레임(2)에 볼트로 체결되어 전원이 인가되면 자력을 발생하는 고정자(3)와, 상기 고정자(3)의 자력에 의해 회전하는 회전자(4)와, 상기 회전자(4)에 압입되어 회전자(4)의 회전에 따라 회전자(4)와 같이 회전하는 중공의 크랭크축(5)으로 구성된다.The electric machine part is fastened to the frame 2 by bolts, and when a power is applied, the stator 3 generates a magnetic force, the rotor 4 rotates by the magnetic force of the stator 3, and the rotor 4 It is composed of a hollow crankshaft (5) press-fitted into) and rotates together with the rotor (4) in accordance with the rotation of the rotor (4).

상기 압축기구부는 크랭크축(5)의 상부에 편심되게 형성된 편심부(6)와, 상기 편심부(6)에 결합되어 크랭크축(5)의 회전운동을 왕복운동으로 바꾸어주는 슬라이더(7)와, 상기 슬라이더(7)와 결합되는 피스톤(8)과, 상기 피스톤(8)의 왕복운동에 의해 냉매를 압축 및 토출하는 실린더(9)와, 상기 하부밀폐용기(1b)내에 담겨 있는 오일(10)과, 상기 오일(10)을 흡상시키도록 크랭크축(5)의 하단에 형성된 프로펠러(11)로 구성하였다.The compressor mechanism includes an eccentric portion 6 formed eccentrically on top of the crank shaft 5, a slider 7 coupled to the eccentric portion 6 to change the rotational movement of the crank shaft 5 into a reciprocating movement. And a piston (8) coupled to the slider (7), a cylinder (9) for compressing and discharging refrigerant by the reciprocating motion of the piston (8), and oil (10) contained in the lower hermetic container (1b). ) And a propeller (11) formed at the lower end of the crankshaft (5) to suck up the oil (10).

이와같이 구성된 종래의 밀폐형 압축기에 전원이 인가되면 고정자(3)와 회전자(4) 사이에 유도전류가 발생하여 회전자(4)가 회전하게 되고, 상기 회전자(4)의 회전에 따라 회전자(4)에 압입된 크랭크축(5)이 회전자(4)와 같이 회전하게 된다.When power is applied to the conventional hermetic compressor configured as described above, an induction current is generated between the stator 3 and the rotor 4 so that the rotor 4 rotates, and the rotor is rotated according to the rotation of the rotor 4. The crankshaft 5 pressed into (4) rotates like the rotor 4.

이때, 상기 크랭크축(5)의 상부에 형성된 편심부(6)는 크랭크축(5)의 회전에 따라 일정한 편심괘적을 그리면서 편심회전하게 되고, 상기 편심부(6)의 편심회전에 따라 편심부(6)에 결합된 슬라이더(7)는 크랭크축(5)의 회전운동을 왕복운동으로 전환하여 그 운동량을 피스톤(8)에 전달하고, 상기 피스톤(8)은 실린더(9)내를 왕복운동하면서 냉매를 압축 및 토출하게 된다.At this time, the eccentric portion 6 formed on the upper portion of the crank shaft 5 is eccentric rotation while drawing a certain eccentric rule according to the rotation of the crank shaft 5, the eccentric rotation of the eccentric portion 6 The slider 7 coupled to the core 6 converts the rotational movement of the crankshaft 5 into reciprocating motion and transmits the momentum to the piston 8, which reciprocates in the cylinder 9. While moving, the refrigerant is compressed and discharged.

한편, 크랭크축(5)의 회전에 따라 크랭크축(5)의 하단에 형성된 프로펠러(11)가 크랭크축(5)과 같이 회전하게 되고, 하부밀폐용기(1b)에 담겨 있는 오일(10)은 프로펠러(11)의 회전원심력에 의해 중공의 크랭크축(5)내부로 흡입되어진다.Meanwhile, as the crank shaft 5 rotates, the propeller 11 formed at the lower end of the crank shaft 5 rotates like the crank shaft 5, and the oil 10 contained in the lower airtight container 1b is It is sucked into the hollow crankshaft 5 by the rotational centrifugal force of the propeller 11.

상기 크랭크축(5) 내부로 흡입된 오일(10)은 중공의 크랭크축(5)내의 유로를 따라 상승하여 윤활이 필요한 각 윤활부위에 공급되며, 여분의 오일(10)은 상부밀폐용기(1a)에 분사되어 진다.The oil (10) sucked into the crankshaft (5) is raised along the flow path in the hollow crankshaft (5) and supplied to each of the lubrication parts requiring lubrication, and the excess oil (10) is the upper airtight container (1a). Sprayed on

도 2 는 피스톤(8)과 실린더(9)로 이루어지는 압축기구부의 상세도로서, 상기에 설명한 바와 같이 오일(10)이 피스톤(8)과 실린더(9)의 사이에서 피스톤(8)의 원활한 직선 왕복운동을 도와주면서 이 부위의 마모를 방지함을 표현한 것이다.FIG. 2 is a detailed view of the compression mechanism consisting of the piston 8 and the cylinder 9, in which the oil 10 is a smooth straight line between the piston 8 and the cylinder 9 as described above. It helps to reciprocate and prevent wear of this area.

도면상의 미설명 부호 12는 피스톤(8)의 직선 왕복운동에 따른 충격을 완화하는 스프링이다.Reference numeral 12 in the drawings is a spring to mitigate the impact of the linear reciprocating motion of the piston (8).

이에 나타난 바와 같이, 상기 피스톤(8)이 실린더(9) 내를 직선왕복운동을 함에 따라 피스톤(8)의 a부 및 b부 외주면과 실린더(9)의 내면이 접촉하게 되며, 상기 a부 및 b부의 사이 공간에는 오일(10)이 충진된다.As shown in the figure, as the piston 8 linearly reciprocates in the cylinder 9, the outer peripheral surfaces of the a and b portions of the piston 8 come into contact with the inner surfaces of the cylinder 9, and the a and The oil 10 is filled in the space between the b portions.

그러나 이러한 종래의 구조에서는 도 3 과 같이 피스톤의 a부가 원통형이고, 그 외주면이 평평하게 구성되므로 오일이 실린더와 a부 사이 간극으로 유입되기 어려워 금속 대 금속 간의 마찰로 인해 이 부위에 마모가 발생되고, 이로 인해 압축기의 압축 효율이 감소하며, 신뢰성이 저하되는 문제점이 있었다.(b부는 압축실과 접해있으므로 고압의 냉매로 인해 구조 변경이 어려워 a부를 중점적으로 설명하기로 한다.)However, in the conventional structure, as shown in FIG. 3, the a part of the piston is cylindrical and its outer circumferential surface is flat, so that oil is difficult to enter into the gap between the cylinder and the a part, and wear occurs at this part due to friction between metal and metal. As a result, the compression efficiency of the compressor decreases and the reliability decreases. (B part is in contact with the compression chamber, so it is difficult to change the structure due to the high pressure refrigerant.

본 발명은 이러한 점을 감안하여 피스톤 외주면 일부를 단가공하여 구성함으로써 피스톤과 실린더의 사이에 오일을 원활히 공급하여 피스톤과 실린더의 접촉부 마모를 방지함과 동시에 마찰면적을 줄여 마찰손실을 저감하는 데 그 목적이 있다.In view of the above, the present invention is constructed by uniting a portion of the outer peripheral surface of the piston to smoothly supply oil between the piston and the cylinder to prevent wear of the contact portion between the piston and the cylinder, and at the same time reduce the friction area to reduce the friction loss. There is a purpose.

도 1 은 일반적인 밀폐형 압축기의 구성도.1 is a block diagram of a typical hermetic compressor.

도 2 는 종래 밀폐형 압축기의 압축기구부 상세도.Figure 2 is a detailed view of the compression mechanism of the conventional hermetic compressor.

도 3 은 도 2 의 A-A'단면도.3 is a cross-sectional view taken along line AA ′ of FIG. 2;

도 4 는 본 발명에 의한 밀폐형 압축기의 피스톤 단면도.Figure 4 is a cross-sectional view of the piston of the hermetic compressor according to the present invention.

*** 도면의 주요 부분에 대한 부호의 설명 ****** Explanation of symbols for the main parts of the drawing ***

101 : 피스톤 101a : 단가공 부위101: piston 101a: unit machining area

이하, 본 발명을 첨부한 도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 4 는 본 발명에 의한 밀폐형 압축기 피스톤의 단면도로서, 피스톤(101)의 실린더(도면상에 미도시) 접촉부의 외주면을 단가공하여 구성한다.Fig. 4 is a cross-sectional view of the hermetic compressor piston according to the present invention, and is constructed by short-processing the outer circumferential surface of the cylinder (not shown) contact portion of the piston 101.

이때, 상기 피스톤(101)의 단가공 부위(101a)는 압축기의 압축효율을 감안하여 원주의 1/2정도로 구성되는데, 피스톤 단면의 원주를 8등분하여 단가공된 부위에 인접한 부분은 단가공을 하지 않도록 한다.At this time, the end-processing portion 101a of the piston 101 is composed of about 1/2 of the circumference in consideration of the compression efficiency of the compressor, and the portion adjacent to the end-processed portion by dividing the circumference of the piston section into eight equal parts Do not do it.

이와 같이 구성된 상태에서 전동기구부의 작용으로 피스톤(101)이 실린더 내를 직선왕복운동하면서 냉매를 흡입, 압축, 토출하게 된다.In the state configured as described above, the piston 101, while linearly reciprocating in the cylinder by the action of the electric mechanism part, sucks, compresses, and discharges the refrigerant.

이때, 상기 피스톤(101)이 실린더 내를 직선왕복운동함에 따라 피스톤(101)의 외주면과 실린더의 내면이 접촉하게 되므로 이 부위의 마모를 방지하고, 접촉면적을 줄여 마찰 손실을 저감하기 위해 이 부위에 오일을 공급해야만 한다.At this time, as the piston 101 linearly reciprocates in the cylinder, the outer circumferential surface of the piston 101 and the inner surface of the cylinder come into contact with each other to prevent abrasion of the portion and to reduce the contact area to reduce the friction loss. Oil must be supplied.

본 발명에 의한 실시예는 이를 해결하기 위해 피스톤(101)의 단면 원주면을 단가공하여 이 단가공 부위(101a)를 통해 오일을 공급하도록 한 것이다.In order to solve this problem, the embodiment of the present invention is to end-process the end surface circumferential surface of the piston 101 to supply oil through the end-processing part 101a.

여기서, 상기 단가공 부위(101a)는 피스톤 단면 원주의 1/2정도로 구성되는데, 단가공부위(101a)를 통해 오일이 공급되면 단가공되지 않은 부분이 실린더 내 윤활운동을 맡게 된다.Here, the end machining portion (101a) is composed of about 1/2 of the piston circumference circumference, when the oil is supplied through the end machining portion (101a) the unprocessed portion is in charge of the lubrication movement in the cylinder.

또한, 상기 단가공 부위(101a)에 의해 피스톤(101)의 전,후면이 통해있으므로 오일이 피스톤(101) 후면의 스프링(12) 쪽으로 유입되어 스프링 접촉부의 마모도 방지할 수 있게 된다.In addition, since the front and rear surfaces of the piston 101 are passed by the end machining portion 101a, oil is introduced into the spring 12 on the rear surface of the piston 101, thereby preventing wear of the spring contact portion.

이상에서 설명한 바와 같이 본 발명은 피스톤과 실린더의 마찰로 인한 마모가 감소되고, 이 부위의 마찰면적을 줄이게 되므로 마찰손실이 저감되어 압축기의 효율이 향상되는 효과가 있다.As described above, the present invention reduces the abrasion due to the friction between the piston and the cylinder, and reduces the friction area of the part, thereby reducing the frictional loss, thereby improving the efficiency of the compressor.

또한, 단가공 부위를 통해 흘러나온 오일이 스프링 쪽으로 유입되어 스프링 접촉부의 마모도 저감되는 효과가 있다.In addition, the oil flowing out through the end machining portion is introduced into the spring has the effect of reducing the wear of the spring contact portion.

Claims (2)

냉매의 압축 공간을 이루는 실린더와, 상기 실린더 내를 왕복운동하면서 냉매를 흡입, 압축, 토출하는 피스톤이 구비되며, 상기 피스톤의 외주면이 원통형으로 구성되어 있는 밀폐형 압축기의 압축기구부에 있어서,In the compression mechanism of the hermetic compressor comprising a cylinder constituting the compression space of the refrigerant and a piston for suction, compression and discharge of the refrigerant while reciprocating in the cylinder, the outer peripheral surface of the piston is formed in a cylindrical shape, 상기 피스톤과 실린더의 접촉부에 오일을 공급하도록 피스톤의 외주면을 축방향으로 단가공하여서 된 것을 특징으로 하는 밀폐형 압축기의 피스톤.A piston of a hermetic compressor, characterized in that the circumferential end surface of the piston is axially machined to supply oil to the contact portion between the piston and the cylinder. 제 1 항에 있어서,The method of claim 1, 상기 피스톤의 단가공 부위는 원주의 1/2인 것을 특징으로 하는 밀폐형 압축기의 피스톤.The piston of the hermetic compressor, characterized in that the end machining portion of the piston is 1/2 of the circumference.
KR1019970073623A 1997-12-24 1997-12-24 Piston of closed compressor KR100426573B1 (en)

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KR19990053919A KR19990053919A (en) 1999-07-15
KR100426573B1 true KR100426573B1 (en) 2004-06-16

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Publication number Priority date Publication date Assignee Title
CN100375843C (en) * 2004-12-10 2008-03-19 日立空调·家用电器株式会社 Closed compressor

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KR101386476B1 (en) * 2008-01-10 2014-04-18 엘지전자 주식회사 Reciprocating compressor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100375843C (en) * 2004-12-10 2008-03-19 日立空调·家用电器株式会社 Closed compressor

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