KR20070075913A - Over stroke buffer structure for linear compressor - Google Patents

Abstract

Over stroke buffer structure for a linear compressor is provided to buffer collision between adjacent components during over stroke, and to prevent damage of components by installing buffer protrusions between a motor cover and a supporter. Over stroke buffer structure for a linear compressor comprises a piston(52) and a cylinder(54), a linear motor(60), a motor cover(68), a supporter(72) and buffer parts(82,84). The piston and the cylinder compresses refrigerant. The linear motor reciprocates the piston. The motor cover fixes the linear motor. The supporter is connected to the piston, and buffered and supported by a spring with regard to the motor cover. The buffer part is installed between the motor cover and the supporter, and buffers collision of the motor cover and the supporter.

Description

Overstroke buffer structure of linear compressor {OVER STROKE BUFFER STRUCTURE FOR LINEAR COMPRESSOR}

1 is a side cross-sectional view showing a portion of a linear compressor according to the prior art,

2 is a side sectional view showing a part of the linear compressor according to the present invention;

3 is a perspective view showing a buffer type projection which is an essential part of the present invention;

4 is a perspective view showing a buffered ring which is an essential part of the present invention.

<Explanation of symbols on main parts of the drawings>

52: cylinder 54: piston

56: suction valve 58: discharge valve assembly

60: linear motor 62: inner stator

64: outer stator 66: permanent magnet

68: motor cover 70: body cover

72: supporter 82: cushioning projection

84: shock absorbing ring

The present invention relates to a linear compressor including a cylinder, a piston, and a linear motor for driving the same, in which the refrigerant is sucked into the compression space formed between the cylinder and the piston as the piston is driven, and then discharged. Therefore, the present invention relates to a transient stroke buffer structure of a linear compressor that can prevent a collision between components during a transient stroke operation.

1 is a side cross-sectional view of a portion of a linear compressor according to the prior art.

In the conventional linear compressor, as shown in FIG. 1, a compression space P into which one end of the piston 4 is inserted is formed in the cylinder 2, and the linear motor 10 reciprocates linearly with the piston 4. In this case, the refrigerant is sucked into the compression space P, compressed, and then discharged.

Of course, the structure consisting of the cylinder 2, the piston 4 and the linear motor 10 is installed to be elastically supported by a buffer spring (not shown) inside the shell (not shown) which is a closed space.

Here, one end of the cylinder 2 is installed to be fixed to the body frame 3, and one end of the piston 4 is inserted into the cylinder 2 to form a compression space P therein.

At this time, the suction valve (6) is provided in the suction hole (4h) formed to communicate with the compression space (P) at one end of the piston (4), while the discharge valve (8a) can be opened and closed at one end of the cylinder (2) The discharge valve assembly 8 elastically supported by the discharge valve spring 8c is installed inside the discharge cap 8b forming the discharge space D so that the refrigerant is absorbed in accordance with the pressure inside the compression space P. / Adjust the discharge.

Next, the linear motor 10 is installed between the inner stator 12 and the outer stator 14 so that the permanent magnet 16 generates mutual electromagnetic force to drive the piston 4.

At this time, the inner stator 12 is configured such that a plurality of laminations are stacked in the circumferential direction, while one end is supported by the main frame 3 and the other end is fixed axially to the outer peripheral surface of the cylinder 2, The outer stator 14 is configured such that a plurality of laminations are laminated on the coil winding body in the circumferential direction, and the main frame 3 and the motor cover are positioned at regular intervals in the radial direction on the outer circumferential surface of the inner stator 12. 18 are bolted to each other in the axial direction.

In addition, the permanent magnet 16 is installed to be fixed to the connecting member connected to the other end of the piston 4 with a predetermined gap in the radial direction with the inner stator 12 and the outer stator 14, the permanent When the magnet 16 generates mutual electromagnetic force between the inner stator 12 and the outer stator 14, one end of the piston 4 is disposed in the compression space P and the top dead center TDC and the bottom dead center ( BDC) to drive reciprocating linear motion.

Of course, the piston 4 is elastically supported in the axial direction even if the linear motor (10) reciprocating linear movement, so that the body cover 20 is fixed at a predetermined distance in the movement direction from the motor cover (18) And a supporter 22 connected to the other end of the piston 4 is positioned between the motor cover 18 and the main body cover 20 so as to be elastically supported in the movement direction by a plurality of springs S1 and S2. Is installed.

Therefore, when the voltage is supplied to the outer stator 14, mutual electromagnetic force is generated between the inner stator 12 and the outer stator 14 and the permanent magnet 16 to drive the piston 4 reciprocally linearly, One end of the piston 2 reciprocates linearly between the top dead center (TDC) and the bottom dead center (BDC), and accordingly the pressure inside the compression space (P) is variable while the intake valve (6) and the discharge valve ( 8a) is opened and closed to inhale and compress the refrigerant and then discharge it.

At this time, when the piston 4 moves from the top dead center (TDC) to the bottom dead center (BDC) and the pressure inside the compression space (P) is lower than the set suction pressure, the suction valve (6) is opened. Refrigerant is sucked into the compression space (P).

On the other hand, as the piston P moves from the bottom dead center BDC to the top dead center TDC, the refrigerant inside the compression space P is compressed while the intake valve 6 and the discharge valve 8a are closed. Accordingly, when the pressure inside the compression space P becomes higher than the set discharge pressure, the discharge valve 8a is opened and the refrigerant is discharged from the compression space P into the discharge space D. The process is repeated.

However, in the linear compressor according to the related art, as the voltage is supplied to the linear motor 10, the piston 4 is driven by mutual electromagnetic force to reciprocate linearly, and load conditions such as refrigerant inflow or external shock of cryogenic low pressure are applied. Due to a power supply condition such as abnormal supply of power, the piston 4 may make an overstroke in which the piston 4 reciprocates linearly above the top dead center (TDC), and the motor cover according to the transient stroke. The collision occurs frequently at the point A at which the 18 and the supporter 22 come into contact, and at the point B at which the other end of the cylinder 2 and the other end of the piston 4 come into contact with each other. Not only can this be damaged, but there is a problem that the operation reliability and operation efficiency are lowered.

The present invention has been made to solve the above problems of the prior art, the transient stroke buffer of the linear compressor that can prevent the collision between the adjacent components even if the transient stroke of the piston reciprocating linear motion above the top dead center is made The purpose is to provide a structure.

To this end, the present invention is a piston and a cylinder for compressing the refrigerant, a linear motor for linear reciprocating movement of the piston, a motor cover for fixing the linear motor, and connected to the piston, the spring is cushioned against the motor cover Supported supporter, and provided between the motor cover and the supporter, provides a transient stroke buffer structure of the linear compressor, characterized in that it comprises a buffer means for cushioning the collision of the motor cover and the supporter.

In another aspect, the present invention provides a transient stroke buffer structure of the linear compressor, characterized in that the buffer means is a buffer type projection projecting more than the set length toward the supporter on the motor cover.

In another aspect, the present invention provides a transient stroke buffer structure of the linear compressor, characterized in that the buffering projection is made of a plastic material.

In another aspect, the present invention further comprises an auxiliary cushioning means installed between the cylinder and the piston to cushion the collision between the cylinder and the piston during a transient stroke in which the piston is driven above the top dead center. Provide a stroke buffer structure.

In another aspect, the present invention provides a transient stroke buffer structure of the linear compressor, characterized in that the auxiliary buffer means is a buffer ring protruding beyond the set length toward the other end of the cylinder on the other outer peripheral surface of the piston.

In another aspect, the present invention provides a transient stroke buffer structure of the linear compressor, characterized in that the buffer ring is made of a plastic material.

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 part of the linear compressor according to the present invention, Figure 3 and Figure 4 is a perspective view showing the buffer protrusion and the buffer ring, which is the main part of the present invention, respectively.

In the linear compressor according to the present invention, as shown in FIG. 2, one end of the piston 54 is inserted into the cylinder 52 to form a compression space P, and the piston 54 is formed by the linear motor 60. While driving, the refrigerant is sucked into the compression space P to be compressed, and then discharged. Even though the piston 54 is operated in a transient stroke, a cushioning protrusion 82 or a buffering ring 84 is disposed between adjacent components. Installation to prevent direct collisions between components.

Of course, the structure consisting of the cylinder 52, the piston 54 and the linear motor 60 is installed to be supported by a buffer spring (not shown) inside the shell (not shown) which is a closed space, the cylinder 52 The oil stored in the shell is pumped and circulated between the piston and the piston 54 to allow cooling and lubrication.

Here, one end of the cylinder 52 is fixed to the body frame 53, one end of the piston 54 is inserted into the cylinder 52 to form a compression space P therein, the piston (54) A thin suction valve 56 is installed at one end of the suction hole 54h formed in the axial direction so as to communicate with the compression space P at one end thereof, while a discharge valve assembly 58 is disposed at one end of the cylinder 52. Is installed.

At this time, the discharge valve assembly 8 is composed of a discharge valve 58a, a discharge cap 58b and a discharge valve spring 58c, the discharge valve 58a is positioned to block one end of the cylinder 52 The discharge cap 58b is coupled to one end of the cylinder 52 to form a discharge space D therein, and the discharge valve spring 58c opens the discharge valve 58a inside the discharge cap 58b. It is installed to elastically support the opening and closing the discharge valve (58a) in accordance with the pressure in the compression space (P).

Of course, the suction valve 56 is operated to open when the pressure in the compression space (P) is lower than the set suction pressure, while the discharge valve (58a) is the pressure inside the compression space (P) When the pressure is higher than the set discharge pressure, it is operated to open.

Next, the linear motor 60 includes an inner stator 62 in which a plurality of laminations are laminated in a circumferential direction and fixed to each other by an O-ring, an outer stator 64 in which a plurality of laminations are laminated in a circumferential direction on a coil winding body, It consists of a permanent magnet (66) for generating mutual electromagnetic force between the inner stator 62 and the outer stator (64).

At this time, the inner stator 62 has a kind of 'C' shape, one end of which is supported by the body frame 53 and the other end of which is pressed into a ring-shaped fixing groove 52h formed on the outer circumferential surface of the cylinder 52. The outer stator 64 is supported by the fixing ring C and fixed in the axial direction, while the outer stator 64 is positioned at regular intervals in the radial direction on the outer circumferential surface of the inner stator 62 and the motor cover 53. And the permanent magnets 66 are bolted to each other in the axial direction, and the permanent magnet 66 has a predetermined gap in the radial direction with the inner stator 62 and the outer stator 64. It is installed to be fixed to the connecting member connected to one end.

Of course, the piston 54 is elastically supported in the axial direction even if the linear motor 60 is reciprocating linear movement, between the motor cover 68 and the body cover 70 provided at a predetermined interval in the movement direction therewith. A supporter 72 connected to the other end of the piston 54 is located, and the supporter 72 is moved to the motor cover 68 and the main body cover 70 in the direction of movement by a plurality of springs S1 and S2. It is installed to be elastically supported.

More specifically, between the motor cover 68 and the supporter 72 is provided a first spring (S1) is compressed while the piston 54 is moved from the bottom dead center (BDC) to the top dead center (TDC). On the other hand, between the body cover 70 and the supporter 72 is installed a second spring (S2) is compressed while the piston 54 is moved from the top dead center (TDC) to the bottom dead center (BDC), the The supporter 72 has an axial direction from the other end of the piston 54 with a first support end 72a for supporting the first spring S1 at its radially extended end in order to use the installation space more effectively. While bent to be spaced apart by a predetermined interval, the second support end 72b for supporting the second spring (S2) is formed in close proximity to the other end of the piston (54).

In particular, when the piston 54 is driven in a transient stroke above the top dead center (TDC), the other end of the piston 54 and the supporter 72 connected thereto are also moved toward the cylinder 52, and thus the The second support end 72b of the supporter may collide with the motor cover 68, or the other end of the piston 54 may collide with the other end of the cylinder 52. A projection 82 is formed between the motor cover 68 and the supporter 72 as shown in FIG. 3, and the shock absorbing ring 84 is disposed on the other side of the cylinder 52 as shown in FIG. 4. It is formed between one end and the other end of the piston 54.

At this time, the shock absorbing projection 82 is formed to protrude beyond the set length toward the supporter 72 from the motor cover 68, as shown in Figure 3, installed in the supporter 72 is moved It is more preferable that the motor cover 68 is installed at a stationary position.

Furthermore, the cushioning protrusion 82 is preferably formed at a plurality of intervals so as to support the supporter 72 more stably, but not only has a predetermined elasticity to absorb the shock, but also has a shock It is preferable that the wear resistance is also made of an excellent material so as not to wear even if continuously generated. For example, a plastic material, which is a wear resistant material having a predetermined elasticity, may be used, and more preferably, an engineering plastic material may be used.

Here, reference numeral M, which is not illustrated in FIG. 3, is a muffler capable of reducing the flow noise of the refrigerant flowing into the piston 54.

Meanwhile, the shock absorbing ring 84 is installed to be fixed to the other end of the piston 54 as shown in FIG. 4, which fixes the inner stator 62 to the other end of the cylinder 52. In addition, since the fixing groove 52h is formed and the fixing ring C is mounted, it is difficult to secure the installation space of the shock absorbing ring 84, while the other end of the piston 54 has the connection member and Since the flange portion 54a having the bolt groove is configured to extend in the radial direction for bolting the supporter 72, the buffer ring 84 between the outer circumferential surface of the piston 54 and the flange portion 54a. It is easy to secure the installation space.

At this time, the buffer ring 84 is also formed to have a predetermined thickness so as to protrude more than a set length toward the other end of the cylinder 52 from the other end of the piston 54, it is formed in a closed ring shape It may be, but it is more preferable that the portion (84h) is formed in a 'C' ring shape is omitted so that it can be more easily mounted.

Of course, the shock absorbing ring 84 is also preferably made of a material having excellent elasticity as well as a predetermined elasticity, such as engineering plastics, such as the shock absorbing projection (82).

Referring to the operation of the linear compressor configured as described above, as the voltage is supplied 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, so that the piston While driving the reciprocating linear 54, one end of the piston 52 is a reciprocating linear movement between the top dead center (TDC) and the bottom dead center (BDC), thereby changing the pressure in the compression space (P) while The suction valve 56 and the discharge valve 58a are opened and closed to suck and compress the refrigerant, and then discharge the refrigerant.

At this time, when the piston 54 is moved from the top dead center (TDC) to the bottom dead center (BDC) and the pressure inside the compression space (P) is lower than the set suction pressure, the suction valve 56 is opened. The refrigerant is sucked into the compression space P, the first spring S1 is restored, and the second spring S2 is compressed.

On the other hand, as the piston P moves from the bottom dead center BDC to the top dead center TDC, the refrigerant inside the compression space P is compressed while the intake valve 56 and the discharge valve 58a are closed. When the first spring S1 is compressed and the second spring S2 is restored, and the pressure inside the compression space P becomes higher than the set discharge pressure in the process, the discharge valve ( As the 58a) is opened, the refrigerant is discharged from the compression space P into the discharge space D, and the above process is repeated.

On the other hand, due to a load condition or a power supply condition, a transient stroke may be made in which the piston 54 reciprocates linearly above the top dead center (TDC). When the piston 54 is moved above the top dead center (TDC), Even if the other end of the piston 54 is excessively moved toward the other end of the cylinder 52, the second support end 72b of the supporter is first contacted with the cushioning protrusion 82 to absorb the shock force, thereby absorbing the impact force. In addition, the supporter 72 may be prevented from colliding with the motor cover 68.

In addition, the shock absorbing ring 84 on the other end side of the piston 54 is first contacted and cushioned on the other end of the cylinder 52 to absorb impact force, as well as the other end of the piston 54 to the cylinder. The collision with the other end of 52 can also be prevented.

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 transient stroke prevention structure of the linear compressor according to the present invention constituted as described above, by installing a cushioning protrusion between the motor cover and the supporter, or by installing a buffering ring between the cylinder and the piston, the piston reciprocates linearly above the top dead center. Even if a transient stroke is made, the cushioning protrusion and the buffer ring collide with other components, which not only prevents collision between adjacent components during the transient stroke, but also prevents damage to the component even if repeated collisions occur. In addition, there is an advantage to increase the operation reliability and operating efficiency.

Claims (6)

A piston and cylinder for compressing a refrigerant, a linear motor for linearly reciprocating the piston, A motor cover for fixing the linear motor; A supporter connected to the piston and fully supported by the spring with respect to the motor cover; And a cushioning means provided between the motor cover and the supporter to cushion a collision between the motor cover and the supporter. The method of claim 1, The shock absorbing means is a transient stroke buffer structure of the linear compressor, characterized in that the buffer type projection protruding beyond the set length toward the supporter on the motor cover. The method of claim 2, The shock absorbing projection transient stroke structure of a linear compressor, characterized in that made of a plastic material. The method according to any one of claims 1 to 3, And an auxiliary shock absorbing means installed between the cylinder and the piston to cushion the collision between the cylinder and the piston during a transient stroke in which the piston is driven above the top dead center. The method of claim 4, wherein The auxiliary shock absorbing means is a transient stroke buffer structure of the linear compressor, characterized in that the buffer ring protrudes over the set length toward the other end of the cylinder on the other outer peripheral surface of the piston. The method of claim 5, The shock absorbing ring is a transient stroke buffer structure of a linear compressor, characterized in that made of a plastic material.

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