KR101149641B1 - Piston's collision preventing structure for linear compressor - Google Patents

Piston's collision preventing structure for linear compressor Download PDF

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Publication number
KR101149641B1
KR101149641B1 KR1020050012905A KR20050012905A KR101149641B1 KR 101149641 B1 KR101149641 B1 KR 101149641B1 KR 1020050012905 A KR1020050012905 A KR 1020050012905A KR 20050012905 A KR20050012905 A KR 20050012905A KR 101149641 B1 KR101149641 B1 KR 101149641B1
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South Korea
Prior art keywords
piston
end
supporter
cylinder
motor cover
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KR1020050012905A
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Korean (ko)
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KR20060091642A (en
Inventor
안상욱
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엘지전자 주식회사
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Publication of KR20060091642A publication Critical patent/KR20060091642A/en
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Abstract

The present invention provides a cylinder having one end fixed to a main body frame, a piston installed at a reciprocating linear motion in a state in which one end is inserted into the cylinder, and a compression space is formed therebetween so that a refrigerant is sucked and compressed therebetween; A linear motor positioned on an outer circumferential surface of the cylinder so that one end is supported by a frame, and driving the piston at a predetermined stroke; a motor cover assembled to the main body frame while supporting the other end of the linear motor to fix the linear motor; A supporter elastically supported by a plurality of shock absorbing springs in a direction of movement of the piston so as to absorb the vibration generated when the piston is driven to be connected to extend radially to the other end of the piston, the motor cover and / or Is formed to protrude on one surface of the supporter facing each other Even if the piston is driven by the excessive stroke group provides a piston collision protection structure of a linear compressor made of a cushioning projections to the motor cover and / or to collide with the driving supporter only with the stroke set.
Linear compressor, cylinder, piston, linear motor, supporter, motor cover, shock absorber

Description

Piston Collision Avoidance Structure of Linear Compressor {PISTON'S COLLISION PREVENTING STRUCTURE FOR LINEAR COMPRESSOR}

1 is a perspective view showing a supporter of a linear compressor according to the prior art,

Figure 2 is a side sectional view showing a piston collision preventing structure of the linear compressor according to the present invention,

3 is a perspective view showing a supporter of the linear compressor according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

52 cylinder 53 body frame

54: piston 56: suction valve

58a: discharge valve 58b: discharge cap

58c: discharge valve spring 60: linear motor

62: inner stator 64: outer stator

66: permanent magnet 70: supporter

72A, 72B: suction support end of supporter 74A, 74B: discharge support end of supporter

76A, 76B: Connection portion of the supporter 78: Shock absorber

80: motor cover 82A, 82B: compression support end of the motor cover

90: main body cover 92A, 92B: suction support end of the main body cover

S1: Suction buffer spring S2: Compression buffer spring

The present invention relates to a linear compressor in which a piston is driven by a linear motor to inhale and compress a refrigerant while reciprocating linear motion inside a cylinder, and then discharges the pump. In particular, a motor cover for fixing the linear motor even when the piston is driven with excessive stroke and It relates to a piston collision avoidance structure of a linear compressor in which the supporter connected to one end of the piston is configured to first strike and cushion the piston so that the piston is operated only at a set stroke.

In general, a compressor is a mechanical device that increases pressure by receiving power from a power generator such as an electric motor or a turbine to compress air, refrigerant, or various other working gases. It is widely used throughout.

These compressors are classified into a reciprocating compressor which compresses the refrigerant while linearly reciprocating the inside of the cylinder by forming a compression space in which the working gas is absorbed and discharged between the piston and the cylinder. And a rotary compressor for compressing the refrigerant while the roller is eccentrically rotated along the inner wall of the cylinder so that a compression space for absorbing and discharging the working gas is formed between the eccentrically rotating roller and the cylinder. As a scroll compressor that compresses the refrigerant while the rotating scroll rotates along the fixed scroll to form a compression space in which the working gas is absorbed and discharged between the orbiting scroll and the fixed scroll. Divided.

Recently, among the reciprocating compressors, in particular, the piston is directly connected to the reciprocating linear motion drive motor, so that there is no mechanical loss due to the motion conversion to improve the compression efficiency as well as a simple linear compressor has been developed a lot.

Normally, a linear compressor is configured to suck and compress refrigerant and then discharge the refrigerant while the piston is moved reciprocally linearly in the cylinder by the linear motor inside the sealed shell, the linear motor being permanent between the inner and outer stators. The magnets are positioned so that the permanent magnets are linearly reciprocated by mutual electromagnetic forces. As the permanent magnets are driven in connection with the pistons, the pistons reciprocate linearly inside the cylinders to inhale and compress the refrigerant, and then discharge them. To do that.

The linear compressor as described above is provided with a radially extended supporter at the other end of the piston to not only dampen vibration generated when the piston is driven by the linear motor, but also provide restoring force in addition to the linear motor. Compression buffer springs and compression buffer springs which are respectively compressed during the suction / compression stroke of the piston in both axial directions of the supporter are installed.

Here, the suction buffer spring is installed between the main body cover and the supporter fixed at regular intervals from the other end of the cylinder and the linear motor, the compression buffer spring is different from the other surface of the motor cover that the linear motor is supported on one surface It is installed between the supporters, and the main body cover and the motor cover are positioned on both sides of the supporter so as to be supported on different surfaces.

At this time, as the piston is operated, the springs are buffered and supported between the supporter which is moved together with the piston while the supporter is reciprocally linearly moved in the axial direction, the body cover fixed to the cylinder, and the motor cover.

1 is a perspective view showing a supporter of a linear compressor according to the prior art.

Specifically, the supporter is installed to extend radially to the other end of the piston, as shown in Figure 1, the hole 10H in the center so that a muffler (not shown) to reduce the flow noise of the refrigerant is installed In addition, the support end 12A, 12B, 14A, 14B having a pair of support protrusions formed at four circumferential portions is formed, and the suction buffer spring and the compression buffer spring are installed.

Here, the support ends 12A, 12B, 14A, and 14B are divided into suction support ends 12A and 12B for supporting the suction buffer spring, and compression support ends 14A and 14B for supporting the compression buffer spring. The suction support ends 12A, 12B and the compression support ends 14A, 14B are alternately positioned, and the suction support ends 12A, 12B are located on the same vertical surface, while the compression support ends ( 14A and 14B are formed to be connected by connecting portions 16A and 16B elongated in the axial direction so as to be positioned at positions spaced apart from each other by the opposite direction to the piston.

At this time, the suction support end 12A, 12B is formed so that the support protrusion protrudes in the opposite direction of the piston, while the compression support end 14A, 14B protrudes the support protrusion in the direction in which the piston is located. It is formed to be.

Of course, the supporter 10 is designed not to collide with the main body cover and the motor cover even when the piston is operated at a set stroke by the linear motor.

Therefore, since the supporter 10 is located between the main body cover and the motor cover, the suction buffer spring is supported between the main body cover and the suction support ends 12A and 12B of the supporter, and the compression buffer spring is supported by the supporter. And the piston is driven between the compression support ends 14A and 14B of the motor cover, and the piston is driven by the linear motor at a set stroke so that the supporter moves reciprocally linearly with the piston. It is elastically supported by a compression buffer spring.

However, in the conventional linear compressor, vibration and noise may be generated when the suction support ends 12A and 12B of the supporter and the motor cover collide with each other as the piston is operated with an excessive stroke. Even if the supporter 10 and the motor cover are designed in consideration of the excessive stroke, the piston hits the discharge valve to not only cause vibration and noise, but also the discharge valve is damaged due to a collision, thereby lowering the reliability of the product. There is this.

The present invention has been made to solve the above problems of the prior art, to provide a piston collision avoidance structure of the linear compressor to be operated only in the set stroke to be buffered before hitting the discharge valve even if the piston is operated in an excessive stroke. There is this.

The piston collision avoidance structure of the linear compressor according to the present invention for solving the above problems is a cylinder having one end fixed to the body frame, and one end is inserted into the cylinder to form a compression space in which the refrigerant is sucked in between A piston which is installed to reciprocate linearly in a state to be supported, a linear motor which is located on the outer circumferential surface of the cylinder so that one end is supported by the main body frame, and drives the piston at a set stroke, and in which the other end of the linear motor is supported A motor cover assembled to the main frame to fix the linear motor, and connected to the other end of the piston so as to extend radially in a radial direction so as to buffer vibration generated when the piston is driven; A supporter elastically supported by the shock absorbing spring, Group is composed is formed so as to project on a side opposite to each other of the motor cover and / or the supporter in the buffer projections to be driven, even if only the piston is driven by the excessive stroke stroke hit and said motor cover and / or the supporter set.

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

Figure 2 is a side sectional view showing a piston collision preventing structure of the linear compressor according to the present invention, Figure 3 is a perspective view showing the supporter of the linear compressor according to the present invention.

In the linear compressor to which the piston collision preventing structure according to the present invention is applied, as shown in FIG. 2, one end of the cylinder 52 is fixed to the body frame 53 and one end of the piston 54 is inserted into the cylinder 52. And a compression space P is formed therein, and a linear motor 60 is positioned on the outer circumferential surface of the cylinder 52 so that the stator is fixed to the body frame 53 by the motor cover 80 and simultaneously movable. The other end of the piston 54 is connected to the other end of the piston 54, so that the piston 54 is driven by the linear motor 60 so that the piston 54 can be elastically supported in the axial direction even in the reciprocating linear motion. An extended supporter 70 is installed, and the piston is excessive because the buffer protrusion 78 is formed on one surface of the supporter 70 facing the motor cover 80 so as to protrude toward the motor cover 80.Even if Trojan croissant operation so that the buffer protrusion 78 is operating only as a buffer as well as to collide with the motor cover 80 stroke the piston 54 is set.

Here, the cylinder 52 is fixed to the one end is penetrated so as to penetrate the body frame 53, the one end of the piston 54 is inserted into the inside of the compression space in which the refrigerant is sucked and compressed therebetween ( P) is formed.

Of course, the suction hole 54h is formed to allow the refrigerant to be supplied to the compression space P at one end of the piston 54, and a thin suction valve may be opened and closed to open and close the suction hole 54h. 56) is fixedly installed.

In addition, the discharge valve 58a is installed to open and close so that the refrigerant compressed in the compression space P may be discharged to one end of the cylinder 52, and the discharge cap 58b fixed to one end of the cylinder 52. ) Is installed to be elastically supported by the spiral discharge valve spring 58c.

Next, the linear motor 60 has a cylindrical inner stator 62 configured to stack a plurality of laminations in a circumferential direction, and a plurality of laminations are circumferentially spaced in a circumferential direction on a coil wound body wound around the circumferential direction. A stator composed of a cylindrical outer stator 64 provided with a pair of stacked core blocks, and a permanent magnet 66 positioned between the inner stator 62 and the outer stator 64 and reciprocating linearly by mutual electromagnetic force. It is made of phosphorus mover.

At this time, the inner stator 62 is installed so that the other end is fixed to the outer peripheral surface of the cylinder 52 by a fixing ring (not shown) while the one end is supported by the main frame 53, the outer stator 64 Is positioned on the outer circumferential surface of the inner stator 52 at a predetermined interval so that the other end is supported by the motor cover 80 while the other end is supported by the body frame 53 and the motor cover 80 is Bolted to the body frame 53, the permanent magnet 66 is axially movable between the inner stator 62 and the outer stator 64 to be connected to the other end of the piston 54 Is installed.

Next, the supporter 70 is connected to the other end of the piston 54 so as to extend in the radial direction, and the motor cover 80 is positioned at one side of the supporter 70 at the opposite side thereof. The main body cover 90 is located in the main body cover 90, which is spaced apart from the motor cover 80 in a direction opposite to the piston 54 at a predetermined length in the axial direction. (N) is installed to be fixed to the motor cover (80).

In addition, the suction buffer spring (S1) is installed between the supporter 70 and the main body cover 90 to be compressed and supported during the suction stroke of the piston 54 and at the same time the supporter 70 and the motor cover ( The compression buffer spring (S2) is provided between the 80 to be supported by the compression stroke of the piston (54).

In this case, the supporter 70 and the main body cover 90 are provided with suction support ends 72A, 72B, 92A, and 92B so that the suction buffer springs S1 can be supported on surfaces facing each other. Compression support ends 74A, 74B, 82A, and 82B are formed in the 70 and the motor cover 80 so that the compression buffer spring S2 can be supported on the surfaces facing each other.

Specifically, as shown in FIG. 3, the supporter 70 has a hole 70H formed at the center thereof so that a muffler (not shown) for reducing the flow noise of the coolant may be installed. Suction support ends (72A, 72B) and compression support (74A, 74B) is formed by alternating support protrusions of the support projections, the end of the suction support (72A, 72B) on one surface facing the motor cover 80 The buffer protrusion 78 is formed to protrude so as to face the motor cover 80, and the buffer protrusion 78 is formed on one surface of the motor cover 80 opposite to the suction support ends 72A and 72B of the supporter. It may be formed to protrude.

At this time, the suction support end (72A, 72B) is formed on the same plane to support the suction buffer spring (S1), while the compression support end (74A, 74B) is the compression buffer spring (S2) The suction support end (72A, 72B) and the discharge support end (74A, 74B) and the discharge support end (74A, 74B) are positioned so as to be spaced apart from the suction support (72A, 72B) in a direction opposite to the piston (54) It is provided to be connected to each other by connecting portions 76A, 76B elongated in the direction.

Of course, the suction support ends 72A and 72B and the discharge support ends 74A and 74B are formed so that respective support protrusions face the main body cover 90 and the motor cover 80. The support protrusions of 72B and the support protrusions of the discharge support ends 74A and 74B are formed to protrude in opposite directions from the supporter 70, respectively, so that the suction buffer springs S1 and the compression buffer springs are formed on the respective support protrusions. S2) is installed to be seated.

In particular, the buffer projection 78 is formed by bending the end of the suction support end (72A, 72B) toward the motor cover 80, the buffer projection 78 is projected to the motor cover 80 The length is designed as a set value. The set value of the shock absorbing projection 78 does not impinge on the motor cover 80 when the piston 54 is operated at a set stroke, but the piston 54 is connected to the piston ( It is designed to impinge on the motor cover 80 when operated with an excessive piston stroke larger than the set stroke of 54).

At this time, the set stroke of the piston 54 is between the top dead center (TDC) of the piston and the bottom dead center (BDC) of the piston at intervals at which the piston 54 can be moved. The top dead center (TDC) of the piston is usually designed to be set at a specific point before the piston 54 is contacted with the discharge valve 58a in consideration of component damage and vibration / noise.

Therefore, when the piston 54 is to be operated with excessive stroke, the shock absorbing projection 78 first collides with the motor cover 80 before the piston 54 comes into contact with the discharge valve 58a. Allow 54 to operate only at the set stroke.

Looking at the operation of the present invention configured as described above, first, as the power is applied to the outer stator 64, mutual electromagnetic force is generated between the inner stator 62 and the outer stator 64 and the permanent magnet 66 and The permanent magnet 66 and the piston 54 connected thereto are reciprocated linearly, and thus the suction valve 56 and the discharge valve 58a are opened and closed due to the change in the internal pressure of the compression space P. FIG. The refrigerant is sucked into the compression space P, compressed, and then discharged.

At this time, the supporter 70 connected to the piston 54 is elastically supported while compressing the suction buffer spring S1 during the suction stroke of the piston 54, while the piston (during the compression stroke of the piston 54). The supporter 70 connected with 54 is elastically supported while compressing the compression buffer spring S1 and is stably operated.

In general, the linear motor 60 operates the piston 54 at a set stroke. The linear motor 60 may operate due to various noises or stroke variations and other external influences included in power input to the linear motor 60. Motor 60 may be operated with excessive stroke on piston 54.

As such, even when the piston 54 is operated with an excessive stroke, the buffer protrusion 78 is formed to protrude on the supporter 70 connected with the piston 54 so that the piston 54 is discharge valve. Since the shock absorbing projection 78 hits the motor cover 80 and is fully cushioned before the impact of the shock impingement 58a, it is possible to prevent damage to the discharge valve 58a. Furthermore, only the shock absorbing projection 78 is the motor cover 80. ), The contact area is small, so that vibration and noise may be reduced, and the piston 54 may be adjusted to operate only at a set stroke.

In the above, the present invention has been described in detail by way of examples based on the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

The piston anti-collision structure of the linear compressor according to the present invention configured as described above operates the piston at a set stroke because a cushioning protrusion is formed on one surface of the supporter connected to the piston end and / or the motor cover positioned in close proximity thereto. If the supporter and the motor cover do not collide with each other when the piston is operated with excessive stroke, the piston is operated only with the set stroke as the supporter and the motor cover are collided by the buffer protrusion to prevent damage to components such as the discharge valve. Not only that, but also the impact contact is narrow, which can reduce vibration and noise.

Claims (4)

  1. The cylinder which one end is fixed to the body frame,
    A piston which is installed in the cylinder so as to be reciprocated linearly in a state in which one end is inserted to form a compression space in which a refrigerant is sucked and compressed therebetween;
    A linear motor positioned on the outer circumferential surface of the cylinder such that one end thereof is supported by the main body frame to drive the piston at a predetermined stroke;
    A motor cover which is assembled to the main frame to fix the linear motor while supporting the other end of the linear motor;
    A supporter elastically supported by the plurality of shock absorbing springs in the movement direction of the piston to be connected to extend in the radial direction to the other end of the piston to cushion the vibration generated when the piston is driven;
    A linear compressor, which is formed to protrude on one surface of the motor cover and / or supporter facing each other so that the piston is driven only by a set stroke by hitting the motor cover and / or the supporter even when driven by an excessive stroke. Piston anti-collision structure.
  2. The method of claim 1,
    A discharge valve positioned to block one end of the cylinder and installed to be opened and closed according to an internal pressure of the compression space;
    A discharge cap installed to be fixed to one end of the cylinder to discharge the refrigerant compressed in the compression space to be temporarily stored;
    It is configured to further include a spiral discharge valve spring for elastically supporting the discharge valve in the axial direction inside the discharge cap,
    The shock absorbing projection is a piston collision prevention structure of a linear compressor, characterized in that the shock absorbing projection is formed to protrude beyond the set value so that the shock absorbing projection collides with the motor cover and / or supporter before one end of the piston hits the discharge valve.
  3. The method according to claim 1 or 2,
    The buffer protrusion is a piston collision prevention structure of the linear compressor, characterized in that formed to protrude on one surface of the supporter facing the motor cover.
  4. The method of claim 3, wherein
    The buffer protrusion is a piston collision prevention structure of the linear compressor, characterized in that the circumferential portion of the supporter is bent to face the motor cover from one surface of the supporter.
KR1020050012905A 2005-02-16 2005-02-16 Piston's collision preventing structure for linear compressor KR101149641B1 (en)

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KR101149641B1 true KR101149641B1 (en) 2012-05-25

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101507605B1 (en) * 2007-10-24 2015-04-01 엘지전자 주식회사 linear compressor
CN104005932B (en) * 2013-02-21 2016-09-28 青岛海尔智能技术研发有限公司 Linear Compressor
KR101480239B1 (en) * 2013-07-29 2015-01-08 엘지전자 주식회사 Linear compressor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003227465A (en) 2002-02-01 2003-08-15 Samsung Electronics Co Ltd Linear compressor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003227465A (en) 2002-02-01 2003-08-15 Samsung Electronics Co Ltd Linear compressor

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