KR100579579B1 - Linear compressor - Google Patents

Abstract

In the linear compressor according to the present invention, when the pressure in the compression chamber of the cylinder is greater than or equal to the set pressure, the safety valve is provided in the piston so that the fluid in the compression chamber flows out into the piston, whereby the pressure in the compression chamber is excessively increased. Since the suction valve of the piston can be prevented from being damaged by the pressure applied from the compression chamber, and the size of the suction port can be increased, the suction efficiency is improved to improve the performance of the linear compressor. It can be effected.

Linear compressor, piston, cylinder, suction port, suction valve, safety valve

Description

Linear compressor {Linear compressor}             

1 is a longitudinal sectional view showing a linear compressor according to the prior art,

2 is a front view of a piston according to the prior art,

3 is a front view of a suction valve according to the prior art,

4 is a longitudinal sectional view showing a linear compressor according to a first embodiment of the present invention;

Figure 5 is an enlarged cross-sectional view of the safety valve according to the first embodiment of the present invention.

6 is a front view of a piston according to a first embodiment of the present invention,

7 is a front view of a suction valve according to a first embodiment of the present invention;

8 is an enlarged cross-sectional view of a safety valve of a linear compressor according to a second embodiment of the present invention;

9 is an enlarged cross-sectional view of a safety valve of a linear compressor according to a third embodiment of the present invention;

10 is an enlarged cross-sectional view of a safety valve of a linear compressor according to a fourth embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

60: airtight container 62: cylinder

64: cylinder block 66: back cover

68: linear motor 70: first damper

72: second damper 74: piston

74a: flange portion 74b: suction flow path

74c: suction port 74d: bolt

76: first spring 78: second spring

80: safety valve 82: communication path

84: valve body 84a: fitting protrusion

86: valve spring 88: locking means

88a: first locking jaw 88b: second locking jaw

90: suction valve 92: discharge valve

94: inner discharge cover 96: outer discharge cover

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear compressor. In particular, the piston is provided with a safety valve to prevent excessively high pressure in the compression chamber of the cylinder, thereby preventing damage to the suction valve of the piston due to pressure applied from the compression chamber. A linear compressor can be improved in performance and performance.

In general, a linear compressor is a device that sucks, compresses and discharges a fluid while linearly reciprocating a piston inside a cylinder by using a linear driving force of a linear motor.

1 is a longitudinal sectional view showing a linear compressor according to the prior art, Figure 2 is a front view of a piston according to the prior art, Figure 3 is a front view of the suction valve according to the prior art.

1 to 3, the linear compressor according to the related art includes a cylinder block 14 having a cylinder 12 inside a sealed container 10 and a back cover having a fluid inlet 16 formed therein. 18 is provided, and the cylinder block 14 and the back cover 18 are bufferably supported in the sealed container 10 by the first damper 20 and the second damper 22.

Between the cylinder block 14 and the back cover 18, a linear motor 24 is generated which generates a driving force to compress the fluid.

The linear motor 24 is composed of a stator and a mover. The stator includes an outer core 24a, an inner core 24b, and a coil 24c forming a magnetic field. The mover includes the coil 24c. It consists of a magnet 24d linearly moved by a magnetic force formed in the periphery, and a magnet frame 24e to which the magnet 24d is fixed.

A piston 26 is coupled to the magnet frame 24e to compress the fluid while receiving a linear kinetic force of the magnet 24d and linearly reciprocating the inside of the cylinder 12.

The piston 26 has a flange portion 26a formed at the rear to be fixed to the magnet frame 24e, and between the flange portion 26a and the cylinder block 14 so that the piston 26 is elastically supported. The first spring 28 is disposed, and the second spring 30 is disposed between the flange portion 26a and the back cover 18.

The piston 26 is formed in a cylindrical shape with the rear open, a suction flow path 26b through which fluid is introduced, and a plurality of suction ports 26c are formed on a front surface thereof.

Here, the suction port 26c is eccentrically formed at a position spaced apart from the front center of the piston 26 by a predetermined interval.

The front surface of the piston 26 is provided with a suction valve 32 for opening and closing the suction port 26c, the suction valve 32 is fixed to the front center of the piston 55 by a fastening member such as a bolt. And elastically bends and opens and closes the suction port 26c according to the pressure difference between the inside and the outside of the suction port 26c.

On the other hand, the discharge unit 40 for discharging the compressed fluid in front of the compression chamber (C) of the cylinder 14 is provided.

The discharge part 40 is fixed to the cylinder block 14 and is supported by an inner discharge cover 42 having a discharge hole 42a formed at one side thereof, and a discharge spring 44 supported by the inner discharge cover 42. A discharge valve 46 for opening and closing the compression chamber of the cylinder 12 and an outer discharge cover 48 arranged to form a predetermined space on the outside of the inner discharge cover 42.

The outer discharge cover 48 is equipped with a discharge pipe 48a for discharging the compressed fluid to the outside.

Looking at the operation of the linear compressor according to the prior art configured as described above are as follows.

When the linear motor 24 is operated, the magnet 24d linearly reciprocates in interaction with the magnetic field around the coil 24c, and the kinetic force is applied to the piston 26 through the magnet frame 24e. The piston 26 is transmitted to continuously reciprocate linearly between the discharge valve 46 and the back cover 18 of the discharge part 40.

When the piston 26 is advanced toward the discharge portion 40, the suction valve 32 is closed by the pressure difference between the suction flow path 26b and the compression chamber (C).

In addition, after the fluid in the compression chamber C is compressed as the piston 26 moves forward, the inner discharge is performed while the discharge valve 46 is opened by overcoming the elastic force of the discharge spring 44. After discharged to the inside of the cover 42, it is discharged to the outside via the outer discharge cover 48.

On the other hand, when the piston 26 is reversed, the suction valve 32 is opened by the pressure difference between the suction passage 26b and the compression chamber (C).

The fluid on the suction passage 26b of the piston 26 is introduced into the compression chamber C through the suction port 26c, and the discharge valve 46 is the discharge spring 44. The compression chamber (C) is closed by the elastic force of

As the piston 26 is advanced and retracted as described above, the process of compressing and discharging the fluid in the compression chamber C is repeated.

However, in the linear compressor according to the related art, when the high pressure is applied to the compression chamber C, the force applied to the suction valve 32 by the pressure difference between the compression chamber C and the suction flow path 26b is very high. There is a problem in that the suction valve 32 is large, and when the size of the suction port 26c is reduced in order to reduce the damage of the suction valve 32, the compression chamber C is removed from the suction passage 26b. When the fluid is sucked into), there is a problem that the flow resistance is increased and the efficiency is decreased.

The present invention has been made to solve the above problems of the prior art, by preventing the compression chamber of the cylinder to be in an excessive high pressure state, to provide a linear compressor that can reduce the damage of the intake valve to improve durability and performance Its purpose is to.

The linear compressor according to the present invention for solving the above problems is a cylinder in which a compression chamber is formed, a suction port is formed so that the fluid is sucked into the compression chamber, and the piston is removably arranged to compress the fluid in the compression chamber; And a suction valve mounted to the piston to open and close the suction port, and a safety provided at the piston such that the fluid in the compression chamber flows out into the piston when the pressure difference between the compression chamber and the piston becomes larger than a set value. It characterized in that it comprises a valve.

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

4 is a longitudinal sectional view showing a linear compressor according to a first embodiment of the present invention, Figure 5 is a longitudinal sectional view showing an enlarged safety valve of the linear compressor according to the first embodiment of the present invention, Figure 6 7 is a front view of the piston according to the first embodiment of the present invention, and FIG. 7 is a front view of the suction valve according to the first embodiment of the present invention.

4 to 7, the linear compressor according to the first embodiment of the present invention includes a cylinder block 64 having a cylinder 62 inside the sealed container 60 and a fluid suction port 66a. Is provided with a back cover 66, and a linear motor 68 is disposed between the cylinder block 64 and the back cover 66 to generate a driving force to compress the fluid.

Here, the cylinder block 64 and the back cover 66 are bufferably supported in the sealed container 60 by the first damper 70 and the second damper 72.

The linear motor 68 is composed of a stator and a mover. The stator includes an outer core 68a, an inner core 68b, and a coil 68c forming a magnetic field. 68c) a magnet 68d linearly moved by a magnetic force formed around the magnet 68b, and a magnet frame 68e to which the magnet 68d is fixed.

On the other hand, the cylinder 62 is formed with a compression chamber (C), the piston 74 is disposed in the cylinder 62 so as to be able to move back and forth to compress the fluid sucked in the compression chamber (C), The piston 74 is provided with a safety valve 80 to allow the fluid in the compression chamber (C) to flow into the interior of the piston (74) when the pressure in the compression chamber (C) is more than the set pressure.

In addition, an inner discharge cover 94 having a discharge valve 92 is installed in front of the compression chamber C of the cylinder to discharge the compressed fluid, and a constant space is provided outside the inner discharge cover 94. An outer discharge cover 96 is formed to be formed, and the outer discharge cover 96 is connected to a discharge pipe 98 for guiding the discharged fluid to the outside of the sealed container 60.

The piston 74 receives the linear kinetic force of the magnet frame 68e and is coupled to the magnet frame 68e to be able to move back and forth in the cylinder 62.

The piston 74 has a flange portion 74a formed to be fixed to the magnet frame 68e at the rear, and elastically supports the piston 74 between the piston 74 and the cylinder block 64. The first spring 76 is disposed, and the second spring 78 is disposed between the flange portion 74a and the back cover.

The piston 74 is formed in a cylindrical shape with the rear open, a suction flow path 74b through which fluid flows is formed, and a suction port 74c for suctioning the fluid into the compression chamber C is formed on the front surface. do.

The suction port 74c is eccentrically formed at a position spaced apart from the front center of the piston 74 by a predetermined interval.

In addition, a suction valve 90 for opening and closing the suction port 74c is mounted on a front surface of the piston 74, and the suction valve 90 is provided with a bolt 74d or the like at a front center portion of the piston 74c. It is fixed by the fastening member is made of a structure that opens and closes the suction port 74c while bending elastically in accordance with the pressure difference between the inside and outside of the suction port (74c).

On the other hand, the safety valve 80, as shown in Figure 5, on the communication path 82 for communicating the suction passage (74b) of the piston 74 and the compression chamber (C) of the cylinder (62). Is mounted.

The communication path 82 is formed separately from the suction port 74c at the piston 74, and the suction valve 90 corresponds to the communication path 82 so as not to block the communication path 82. The portion is formed to be open.

Here, three suction ports 74c are formed to be spaced apart from each other by a predetermined distance from the upper side of the front of the piston 74, and the communication path 82 is limited to the one formed at the lower side of the front side of the piston 74.

In addition, the intake valve 90 is preferably formed with an opening hole 90a so that a portion corresponding to the communication path 82 can be opened.

The safety valve (80) is provided on the communication path (82) and is provided with a valve body (84), which is advanced and retracted by the pressure of the compression chamber (C), and a valve switch for elastically supporting the valve body (84). Pring 86 and the engaging means 88 provided on both sides of the communication path 82 to prevent the separation of the valve body and the valve spring (86).

The valve body 84 is formed to be spaced apart from the inside of the communication path 82 so as to form a flow path through which the fluid introduced from the compression chamber C passes.

The locking means 88 is composed of a first catching jaw 88a formed to catch the valve body 84, and a second catching jaw 88b formed to catch the valve spring 86. The locking jaw 88a and the second locking jaw 88b are integrally formed on the communication path 82 of the piston 74.

That is, the first catching jaw 88a is formed to protrude from the communication path 82 so that the valve body 84 does not escape to the compression chamber C side, and the second catching jaw 88b is the valve. The valve spring 86 protrudes from the communication path 82 so as to support the end portion of the spring 86 and to prevent the valve spring 86 from escaping toward the suction flow path 74b of the piston 74.

Therefore, an inlet port 82a through which the fluid flows from the compression chamber C into the communication path 82 is formed by the first locking jaw 88a, and the communication is performed by the second locking jaw 88b. An outlet 82b through which the fluid flows from the furnace 82 to the suction passage 74b of the piston 74 is formed.

The valve body 84 is provided with a fitting protrusion 84a protruding toward the valve spring 86 so that the end portion of the valve spring 86 is fitted.

The valve spring 86 is formed to impart an elastic force in the direction in which the valve body 84 is closed, and is preferably mounted by adjusting the rigidity of the valve spring 86 in accordance with the set pressure of the compression chamber (C). Do.

Looking at the operation of the linear compressor according to the first embodiment of the present invention configured as described above are as follows.

When the linear motor 68 is operated, the piston 74 is advanced and retracted into the cylinder, and the suction valve 90 is connected to the suction passage 74b of the piston 74 and the compression chamber C. It is opened and closed by pressure difference.

When the pressure in the suction flow path 74b of the piston 74 is higher than the pressure in the compression chamber C, the suction valve 90 is opened while elastically bending toward the compression chamber C, so that the piston Fluid in the suction flow path 74b of the 74 flows into the compression chamber C through the suction port 74c.

On the other hand, when the pressure in the compression chamber (C) becomes higher than the pressure in the suction flow path (74b) of the piston 74, the suction valve 90 is closed so that the fluid inside the compression chamber (C) is After being compressed by the piston 74, the discharge valve 92 is opened and discharged to the outside via the inner discharge cover 94 and the outer discharge cover 96.

At this time, when the pressure in the compression chamber C becomes excessively high and the pressure difference between the compression chamber C and the suction flow path 74b becomes larger than a set value, the safety valve is controlled by the pressure applied from the compression chamber C. The valve body 84 of 80 moves backward toward the suction flow path 74b of the piston 74 while overcoming the elastic force of the valve spring 86.

As the valve body 84 moves backward, the communication path 82 is opened, and the fluid in the compression chamber C flows into the suction path 74b of the piston 74 through the communication path 82. The pressure in the compression chamber C is lowered.

When the pressure of the compression chamber C is lowered, the valve body 84 returns to its original position by the elastic restoring force of the valve spring 86, and the safety valve 80 is closed.

Therefore, the pressure in the compression chamber (C) is prevented from being excessively increased by the safety valve (80), and the damage of the suction valve (90) due to the pressure applied from the compression chamber (C) can be reduced. have.

In addition, as the damage of the suction valve 90 is reduced, the suction port 74c is increased in size to increase the suction amount sucked from the suction passage 74b into the compression chamber C, thereby improving suction efficiency. Can be.

8 is an enlarged cross-sectional view of a safety valve of a linear compressor according to a second embodiment of the present invention.

In the linear compressor according to the second embodiment of the present invention, as shown in FIG. 8, the cylinder 100 having the compression chamber C is formed, and the suction port 101a is configured to suck the fluid into the compression chamber C. A suction formed in the piston (101) to open and close the piston (101) and the suction port (101a) formed to be retractable in the cylinder (100) to compress the fluid in the compression chamber (C). When the pressure difference between the valve 102 and the compression chamber C and the piston 101 becomes larger than a set value, the fluid in the compression chamber C flows out into the piston 101. It is configured to include a safety valve 110 provided in).

The safety valve 110 is provided on the communication path 103 for communicating the inside of the piston 101 and the compression chamber C. The safety valve 110 is mounted on the communication path 103 and the compression chamber C. A valve body 111 advanced and retracted by the pressure of the valve body, a valve spring 112 elastically supporting the valve body 111, and provided on both sides of the communication path 103, It consists of a locking means 113 for preventing the separation of the valve spring (112).

Here, the suction valve 102 is formed with an opening hole 102a so that a portion corresponding to the communication path 103 can be opened.

The locking means 113 includes a locking jaw 114 that is integrally protruded from the piston 101 so that the valve body 111 is caught, and the communication path 103 is engaged with the valve spring 112. It consists of a spring seat 115 mounted on.

The locking jaw 114 is formed to protrude from the communication path 103 of the piston 101 so that the valve body 111 is not separated to the compression chamber (C) side, the spring seat 115 is the valve spring The valve spring 112 is mounted on the communication path 103 so as to support the end of the 112 and not to be separated toward the suction flow path 101b of the piston 101.

Accordingly, the inlet 103a through which the fluid flows from the compression chamber C into the communication path 103 is formed by the locking step 114.

In addition, the spring seat 115 is preferably fixed to the communication path 103 by adhesive or the like, and when the valve body 111 moves backward from the compression chamber C to the communication path 103. The outlet 103b is formed to allow the fluid introduced into the piston 101 to flow out of the piston 101.

The valve body 111 is provided with a fitting protrusion 111a protruding toward the valve spring 112 so that the end portion of the valve spring 112 is fitted.

Accordingly, the safety valve 110 according to the second embodiment of the present invention mounts the valve body 111 and the valve spring 112 on the communication path 103, and then attaches the spring seat 115. It is comprised so that attachment of the said valve body 111 and the valve spring 112 is easy.

9 is an enlarged cross-sectional view of a safety valve of a linear compressor according to a third embodiment of the present invention.

In the linear compressor according to the third embodiment of the present invention, as shown in FIG. 9, the cylinder 120 having the compression chamber C and the suction port 121a are configured to suck the fluid into the compression chamber C. A suction formed in the piston 121 to open and close the piston 121 and the suction port 121a to be moved forward and backward in the cylinder 120 to compress the fluid in the compression chamber C. When the pressure difference between the valve 122 and the compression chamber C and the piston 121 becomes larger than a set value, the piston 121 so that the fluid in the compression chamber C flows into the piston 121. It is configured to include a safety valve 130 provided in).

The safety valve 130 is provided on a communication path 123 for communicating the inside of the piston 122 and the compression chamber C. The safety valve 130 is mounted on the communication path 123 and the compression chamber C. A valve body 131 which is advanced and retracted by the pressure of the valve body, a valve spring 132 that elastically supports the valve body 131, and is provided on both sides of the communication path 123 and is provided with the valve body 131. It consists of a locking means 133 to prevent the departure of the valve spring (132).

Here, the suction valve 122 is formed with an opening hole 122a so that a portion corresponding to the communication path 123 can be opened.

In addition, the locking means 133 is a valve body seat 134 mounted on the communication path 123 to catch the valve body 131 and the valve spring 132 to be caught in the piston 121 It consists of a locking projection 135 integrally formed.

The valve body seat 134 is mounted on the communication path 123 so that the valve body 131 is not separated to the compression chamber C side, and the valve body seat 134 is preferably fixed by adhesion or the like. An inlet 123a is formed to allow the fluid to flow into the communication path 123 from the compression chamber C when the sieve 131 moves backward.

Here, the valve body seat 134 is limited to being in the form of a disc having a hole in the center to form the inlet 123a, and the outer diameter of the valve body seat 134 is of the valve body 131 It is preferable that the inner diameter of the valve body seat 134 is larger than the outer diameter and smaller than the outer diameter of the valve body 131.

The locking jaw 135 is integrally formed to protrude on the communication path 123 of the piston 121 so that the valve spring 132 is not separated into the piston 121. As a result, an outlet 123b through which the fluid introduced into the communication path 123 flows out into the piston 121 is formed.

The valve body 131 has a fitting protrusion 132a protruding toward the valve spring 132 such that an end portion of the valve spring 132 is fitted.

Therefore, the safety valve 130 according to the third embodiment of the present invention, after mounting the valve spring 132 and the valve body 131 on the communication path 123, the valve body seat 134 Since the valve body 131 and the valve spring 132 are easily mounted, the valve body 131 and the valve spring 132 can be easily mounted.

10 is an enlarged cross-sectional view of a safety valve of a linear compressor according to a fourth embodiment of the present invention.

In the linear compressor according to the fourth embodiment of the present invention, as shown in FIG. 10, a cylinder 140 having a compression chamber C formed therein and a suction port 141a to suck fluid into the compression chamber C are provided. A suction formed in the piston 141 to open and close the piston 141 and the suction port 141a which are formed to be retractable in the cylinder 140 to compress the fluid in the compression chamber C. When the pressure difference between the valve 142 and the compression chamber C and the piston 141 becomes larger than a set value, the fluid in the compression chamber C flows out into the piston 141. It is configured to include a safety valve 150 provided in).

The safety valve 150 is provided on the communication path 143 for communicating the interior of the piston 141 and the compression chamber (C), the valve case 151 mounted on the communication path 143 and And a valve body 152 provided in the valve case 151 and forming a flow path between the valve case 151 and advancing and receding by the pressure of the compression chamber C, and provided in the valve case 151. And a valve spring 153 that elastically supports the valve body 152.

Here, the suction valve 142 is formed with an opening hole 142a so that a portion corresponding to the communication path 143 can be opened.

The valve case 151 is formed so as to surround the valve spring 153 and the valve body 152 and is open at both ends thereof, and protrudes from the cylinder part 151a to protrude from the valve body 152. It consists of a locking part 151b formed so that at least one of the valve springs 153 may be caught.

The locking portion 151b protrudes from one side of the tubular portion 151a to prevent the valve body 152 from being separated to the compression chamber C side.

The open end of the valve case 151 and the valve spring 153 are supported on the communication 143 path of the piston 141, and the valve case 151 and the valve spring 153 are separated from each other. The locking step 144 is integrally formed to prevent this.

Accordingly, an inlet 143a through which the fluid flows from the compression chamber C is formed by the locking portion 151b of the valve case 151, and the locking jaw 144 is formed in the valve case 151. An outlet 143b through which the fluid flows into the suction passage 141b of the piston 141 is formed.

The valve body 152 has a fitting protrusion 152a protruding toward the valve spring 153 so that the end portion of the valve spring 153 is fitted.

Accordingly, the safety valve 150 according to the fourth exemplary embodiment of the present invention has the valve case 151 provided with the valve body 152 and the valve spring 153 therein at one time in the communication path 143. By being configured to be mounted, it is easy to mount the safety valve 150 in the communication path 143.

In the linear compressor according to the present invention configured as described above, when the pressure in the compression chamber of the cylinder is equal to or higher than the set pressure, the safety valve is provided in the piston such that the fluid in the compression chamber flows out into the piston, whereby This excessive increase is prevented and there is an effect that the intake valve of the piston can be prevented from being damaged by the pressure applied from the compression chamber.

In addition, since the suction valve is prevented from being damaged by the pressure applied from the compression chamber, the size of the suction port can be increased, so that the suction efficiency is improved and the performance of the linear compressor can be improved.

Claims (11)

A cylinder in which a compression chamber is formed; A piston having a suction port configured to suck the fluid into the compression chamber, the piston being retractably arranged to compress the fluid in the compression chamber; A suction valve mounted to the piston to open and close the suction port; And a safety valve provided in the piston so that the fluid in the compression chamber flows out of the piston when the pressure difference between the compression chamber and the piston becomes larger than a set value. The method of claim 1, The safety valve is a linear compressor, characterized in that provided on the communication path for communicating the interior of the piston and the compression chamber. The method of claim 2, And the communication path is formed separately from the suction port in the piston, and the suction valve is formed such that a portion corresponding to the communication path is opened. The method of claim 2 or 3, The safety valve includes a valve body which forms a flow path between the communication path and is retracted by the pressure of the compression chamber, a valve spring that elastically supports the valve body, and is provided on both sides of the communication path. Linear compressor comprising a locking means for preventing the separation of the valve body and the valve spring. The method of claim 4, wherein The valve body is a linear compressor, characterized in that the fitting projection is formed so that the valve spring is fitted. The method of claim 4, wherein The locking means comprises a first catching jaw formed to catch the valve body, and a second catching jaw formed to catch the valve spring, and the first catching jaw and the second catching jaw are formed integrally protruding from the piston. Featured Linear Compressor. The method of claim 4, wherein The latching means is a linear compressor, characterized in that the locking jaw formed integrally protruding from the piston so that the valve body is caught, and the spring seat is mounted to the communication path so that the valve spring is caught, the outlet is formed. The method of claim 4, wherein The locking unit is a linear compressor, characterized in that the valve body seat is mounted to the communication path and the inlet is provided so that the valve body is caught, and the locking projection integrally protruded from the piston so that the valve spring is caught. The method of claim 2 or 3, The safety valve includes a valve case mounted on the communication path, a valve body provided in the valve case to form a flow path between the valve case and being retracted by the pressure of the compression chamber, and the valve body elastically. Linear compressor, characterized in that consisting of a valve spring for supporting. The method of claim 9, The valve body is a linear compressor, characterized in that the fitting projection is formed so that the valve spring is fitted. The method of claim 10, And the valve case comprises a tubular portion formed to surround the valve spring and the valve body, and a catching portion protruding from the tubular portion and engaging at least one of the valve body and the valve spring.

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