KR0176827B1 - Suction valve fixing structure of a linear compressor - Google Patents

Abstract

The present invention relates to a linear compressor provided with an axial flow valve system. As one embodiment of the present invention, at least one locking groove having a locking jaw at a front outer circumference of a piston is provided. And a positioning piece is extended to a predetermined portion of the intake valve, and the intake valve is fixed to the front surface of the piston with a piston pin to fix the intake valve to the front surface of the piston with the end of the positioning piece positioned in the engaging groove of the piston. By fixing the intake valve more reliably, the reliability of the intake valve is sufficiently secured, thus greatly contributing to the improvement of efficiency.

Description

Intake valve fixing structure of linear compressor

1 to 3 show an example of an axial valve device applied to a linear compressor according to the prior art,

1 is a partial exploded cross-sectional view.

2 is a sectional view of the compression stroke.

3 is a cross-sectional view of the suction stroke.

4 to 7 show another example of the axial valve device applied to the linear compressor according to the prior art,

4 is a cross-sectional view for explaining the overall structure.

5 is a sectional view of the compression stroke.

6 is a perspective view of the first discharge valve.

7 is a perspective view of a second discharge valve.

8 is a cross-sectional view showing another example of an axial valve device applied to a linear compressor according to the prior art.

9 to 12 are components of the axial valve device according to another form of the prior art,

9 is a front view of the intake valve.

10 (a) and 10 (b) are back views and cross-sectional views of the first discharge valve.

11 is a front view of the discharge valve.

12 (a) and 12 (b) are front and sectional views of the second discharge valve.

13 (a) and 13 (b) shows an embodiment of the intake valve fixing structure of the linear compressor according to the present invention,

Figure 13 (a) is a front view of the piston fixed to the intake valve (hereinafter, abbreviated as 'front view').

Figure 13 (b) is a cross-sectional view along the line A-A.

14 is a front view showing another embodiment of the intake valve fixing structure according to the present invention.

15 (a) and 15 (b) shows another embodiment of the intake valve fixing structure according to the present invention,

Figure 15 (a) is a front view.

Figure 15 (b) is a sectional view taken along the line B-B.

16 (a) and 16 (b) shows another embodiment of the intake valve fixing structure according to the present invention,

Figure 16 (a) is an exploded perspective view.

Figure 16 (b) is a cross-sectional view.

17 is a front view showing another embodiment of the intake valve fixing structure according to the present invention.

18 (a) and 18 (b) shows another embodiment of the intake valve fixing structure according to the present invention,

18 (a) is a front view.

18 (b) is a cross-sectional view taken along the line C-C.

* Explanation of symbols for main parts of the drawings

31: piston 31a, 31a: piston hole

31b: recessed part 32, 34, 35, 52: locking groove

32a, 32a ', 34a, 35a, 52a: engaging jaw 33: piston pin

33a: key 36: uneven coupling structure

37: coupling groove 38: pin ball

38a, 44a: keyway 41: suction valve

42: positioning piece 42a, 42a ': locking part

45: engaging projection 46: fastening portion

47: opening and closing part 48: connecting part

51: intermediate valve 51a, 51a: valve ball

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear compressor equipped with an axial flow valve system. In particular, the intake valve constituting the axial valve device can be more securely fixed, thereby improving reliability of the intake valve. It relates to a suction valve fixing structure of a linear compressor that can be sufficiently secured to improve the overall efficiency.

In general, in the linear compressor, more reliably opening and closing operations of the valve for controlling the flow of the refrigerant acts as a basic factor to improve efficiency. For this purpose, the shaft is configured to have the same flow direction as the piston movement direction. Axial flow valve system is known.

1 shows an example of an inertia axial valve device according to the prior art applied to a linear compressor, in which a cylinder groove 2a is formed on a predetermined portion of the inner circumferential surface of the cylinder 2A. A refrigerant suction hole (2b) communicating with the outside is formed in (2a), and a piston groove (5a) communicating with the front surface is formed on the outer peripheral surface of the tip of the piston (5A) housed inside of the cylinder (2A). The suction valve 11 is fixed to the piston pin 12 by the caulking of the inlet valve 11 at the center of the front end face of the 5A, and the suction valve 11 is coupled to allow left and right flow, and thus the piston 5A. The flow of the refrigerant is controlled according to the moving direction of the.

In addition, one side head cover 13 of the cylinder 2A is provided, and a discharge valve 14 and a spring 15 are inserted into the head cover 13 to compress the cylinder 2A. The refrigerant gas compressed in the space C is discharged through the head cover 13 while pushing the discharge valve 14 to overcome the elasticity of the spring 15.

In the figure, reference numeral 5b shows a screw fastening hole, and 11a shows a pin hole of the suction valve 11.

In the axial valve device of the linear compressor, the refrigerant is sucked into the piston 5A through the refrigerant suction hole 2b and the piston groove 5a of the cylinder 2A, and the piston 5A carries out the suction stroke. In order to move in the opposite direction of the discharge valve 14, the intake valve 11 is opened by inertia, so that the refrigerant flows into the gap between the intake valve 11 and the piston 5A to fill the compression space C. do. At this time, the intake valve 11 is not out of the predetermined length by the piston pin 12.

Subsequently, as shown in FIG. 2, during the compression stroke of the refrigerant, the refrigerant in the compression space C is compressed to overcome the elasticity of the spring 15 and is discharged through the head cover 13 while pushing the discharge valve 14. At this time, the intake valve 11 is in close contact with the front surface of the cylinder 2A to keep the clearance volume to a minimum.

Again, after the compression stroke of the piston 5A, as shown in FIG. 3, the piston 5A drags and moves the intake valve 11 spaced apart from the front surface of the piston 5A to perform the suction process. In this case, the discharge valve 14 is returned to its initial state by the restoring force of the spring 15.

On the other hand, Figures 4 to 7 show another type of axial valve device according to the prior art. Looking at the configuration, the first discharge valve 14A and the second discharge valve inside the head cover 13 are shown. It comprised through 14B.

A coolant discharge hole 14a is formed in the center of the first discharge valve 14A, and the second discharge valve 14B can open and close the coolant discharge hole 14a of the first discharge valve 14A. It is formed in the shape of a spiral.

In the drawings, the same reference numerals are given to parts substantially the same as those in FIG. 1.

In the axial valve device of the linear compressor as described above, the refrigerant is sucked into the piston 5A through the refrigerant suction hole 2b and the cylinder groove 2a of the cylinder 2A, and then the piston of the piston 5A. It flows into the clearance gap between the cylinder 2A and the intake valve 11 through the groove | channel 5a, and fills the compression space C. As shown in FIG. At this time, the intake valve 11 is not out of the predetermined length by the piston pin 12.

Thereafter, when the piston 5A moves in the direction of the first discharge valve 14A for the compression stroke, the compressed refrigerant flows into the discharge hole 14a of the first discharge valve 14A, as shown in FIG. As described above, if the compression process continues while the piston pin 12 is fitted in the discharge hole 14a of the first discharge valve 14A, the second discharge valve 14B is pushed in and opens itself so that the refrigerant is headed. It is discharged through the cover (13). That is, since the second discharge valve 14B is opened and closed by its rigidity, the response of the valve is improved.

On the other hand, when the front end portion of the piston 5A collides with the first discharge valve 14A, the second discharge valve 14B is also pushed out by the elastic force of the spring 15 together with the first discharge valve 14A. Thus, the operation of the valve is stabilized.

However, in the axial valve device of the linear compressor according to the prior art as described above, in the former case, since the discharge valve 14 is elastically supported by the spring 15, the discharge valve during the discharge stroke of the refrigerant ( In addition to the slow responsiveness of 14, the suction valve 11 is stuck to the front surface of the piston 5A by oil for improving the lubrication performance of the piston 5A, or the suction valve 11 and the piston pin ( Since the friction occurs between the 12 or the pin hole 11a of the suction valve 11 to which the piston pin 12 is coupled is increased in diameter by the repeated movement of the suction valve 11, the suction valve ( The operation of 11) was unstable, which lowered the efficiency of the linear compressor.

In addition, in the latter case, the double discharge valve structure of the first discharge valve 14A and the second discharge valve 14B is adopted, which makes the discharge valve responsive. Adopting a structure that moves to the right, it was not able to solve the various disadvantages caused by the oil, as well as the second discharge valve (14B) is a thin membrane-like shape having elasticity when the displacement of the refrigerant is excessive when used for a long time There are various problems, such as a decrease in reliability due to the operation of the valve.

In order to solve the various problems as described above, the intake valve is stuck by oil supplied for the lubrication performance of the piston while improving the reliability of valve opening and closing while making the valve responsiveness faster. Or, it is known that the axial valve device of the linear compressor to improve the efficiency by eliminating the friction phenomenon of the intake valve, it will be described by the accompanying drawings as follows.

As shown in FIGS. 8 to 12, the intake refrigerant is fixed in surface contact with the piston pin 23 at the center of the front end face of the piston 22 accommodated in the cylinder 21 without being flowed to the piston pin 23. A first discharge valve 26 and a second discharge valve 27 mounted in an intake valve 24 through which the air is passed, and an inner receiving groove 25a of the head cover 25 fixed to one side of the cylinder 21. ), A stopper 28 disposed behind the second discharge valve 27 to restrict the sliding of the second discharge valve 27, and a receiving groove 25a and a stopper of the head cover 25. It is comprised between the elastic member 29, such as the compression spring which is interposed between 28, and the 1st discharge valve 26, the 2nd discharge valve 27, and the stopper 28 elastically support.

As shown in FIG. 9, the suction valve 24 has a fixed hole 24a formed in the center thereof, and opens and closes the piston holes 22a and 22a formed on the front surface of the piston 22 on both sides. Suction opening and closing portions 24b and 24b each having their own elasticity are formed.

As shown in FIG. 10 (a) and 10 (b), the said 1st discharge valve 26 has the recessed part 26a of the circular yarn which has a predetermined depth in the back surface, and is formed in the center part. The first refrigerant discharge hole 26b is formed.

As shown in FIG. 11, the second discharge valve 27 has a spiral shape having a discharge opening / closing portion 27a for opening and closing the first refrigerant discharge hole 26a of the first discharge valve 26 in the center portion. It is formed.

In addition, the stopper 28 has a predetermined depth on the front surface, for example, 0.4-0.5, as shown in FIGS. 12 ((a) and 12 (b). A circular concave portion 28a is formed in depth, and several second refrigerant discharge holes 28b are formed in the side portions which are not coincident with the discharge opening / closing portion 27a of the second discharge valve 27.

In the figure, reference numeral 30 shows a refrigerant discharge pipe.

According to the axial valve device of the linear compressor configured as described above, the refrigerant supplied from the rear side of the piston 22 proceeds in the direction of the arrow shown and passes through the piston holes 22a and 22a of the piston 22. The suction is pushed into the compression space C while pushing the suction opening / closing portions 24b and 24b of the suction valve 24.

Then, when the piston 22 is moved in the direction of the first discharge valve 26 for the compression stroke, the refrigerant is compressed in the compression space (C), so that the intake valve 24 is intimately in front of the piston 22 Since the surface contact causes the piston holes 22a and 22a of the piston 22 to be closed, the refrigerant is no longer sucked, and the refrigerant compressed in the compression space C is the first refrigerant of the first discharge valve 26. Passes through the discharge hole 26a and pushes the discharge opening / closing portion 27a of the second discharge valve 27 to the internal receiving groove 25a of the head cover 25 through the second refrigerant discharge hole 28b of the stopper 28. After the discharge, it is discharged to the outside along the refrigerant discharge pipe (29).

At this time, since the discharge opening / closing portion 27a of the second discharge valve 27 is caught by the stopper 28, its movement displacement is not large.

On the other hand, when the front end portion of the piston 22 collides with the first discharge valve 26, the intake valve 24 fixed to the front surface of the piston 22 hits the first discharge valve 26, so that the first The discharge valve 26, the second discharge valve 27, and the stopper 28 are pushed out of the elastic member 29, and eventually the buffer operation of the first discharge valve 26 makes the operation of the valve more stable. .

At this time, the head of the piston pin 23 is inserted into the first refrigerant discharge hole (26a) of the first discharge valve 26, the suction valve 24 pushes the first discharge valve 26.

In addition, when the piston 22 moves in the opposite direction during the compression stroke for the intake stroke, the first discharge valve 26 is formed by the self restoring force of the discharge opening / closing portion 27a formed in the second discharge valve 27. 1 The refrigerant discharge hole 26a is closed to prevent the discharge of the refrigerant, and the refrigerant supplied from the rear side of the piston 22 passes through the piston holes 22a and 22a of the piston 22 and the intake valve 24. It is sucked into the compression space (C) while pushing both suction opening and closing portions 24b and 24b.

As described above, suction, compression, and discharge of the refrigerant are performed by the repeated linear reciprocating motion of the piston 22.

In constructing the axial valve device of the linear compressor as described above, there are some limited elements in the technique of fixing the thin plate with the piston pin 23 on the front surface of the piston 22 and using it as the intake valve 24. .

First, in order to improve the suction efficiency, the piston holes 22a and 22a must be symmetrically formed on the front surface of the piston 22, and the piston holes 22a and 22a are shown in FIG. As described above, a reed valve, i.e., suction opening and closing portions 24b and 24b, should be formed at an opposite portion of the suction valve 24, and the suction opening and closing portions 24b and 24b are piston holes 22a and 22a. It should have a relatively small stiffness to more securely open and close the operation. This means that each suction opening and closing portion 24b and 24b should be formed as long as possible.

Therefore, the shape in which the intake valve 24 can cover the piston holes 22a and 22a of the piston 22 is extremely limited, and the intake valve 24 is not misaligned at the front center of the piston 22. It must be fixed correctly.

However, the axial valve device of the linear compressor according to another conventional form as described above is a more improved form that solves various problems of the known axial valve device, and greatly improves the efficiency of the linear compressor. However, since the suction valve 24 is simply fixed by the piston pin 23 on the front surface of the piston 22, the position thereof is misaligned when the suction valve 24 is fastened, or the operation of the suction valve 24 is performed. The phenomenon that the piston pin 23 is released in the middle and the suction opening / closing part 24b, 24b of the suction valve 24 leaves the piston hole 22a, 22a of the piston 22 cannot be excluded, and the suction valve 24 ) Was not guaranteed, so there was a problem in maximizing the efficiency of the linear compressor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a suction valve fixing structure of a linear compressor that can more securely secure the suction valve to the front surface of the piston, thereby sufficiently contributing to the improvement of efficiency by ensuring sufficient reliability of the suction valve.

In one embodiment for achieving the object of the present invention, in the suction structure for opening and closing the piston ball of the piston with the suction opening and closing portion of the intake valve, at least one hook having a locking jaw in the front outer periphery of the piston A groove is formed, and the positioning piece is extended to a predetermined portion of the suction valve, and the suction valve is fixed to the front surface of the piston with a piston pin in a state where the end of the positioning piece is located in the engaging groove of the piston. A suction valve fixing structure of the compressor is provided.

In addition, as another embodiment for achieving the object of the present invention, in the suction structure for opening and closing the piston ball of the piston with the suction opening and closing of the suction valve, the piston and the suction valve is coupled by at least one or more uneven coupling structure The uneven coupling structure has at least one coupling protrusion formed on a piston or a suction valve, and the coupling groove and the coupling protrusion are coupled to each other, and the suction valve is fixed to the suction compressor of the linear compressor. A structure is provided.

In addition, as another embodiment for achieving the object of the present invention, a recess having a predetermined depth around the piston hole of the piston, and a medium having a predetermined thickness formed with a valve hole in communication with the piston hole of the piston on the front of the piston The suction valve is fixed with a piston pin while the suction opening and closing portion of the suction valve is positioned at the valve hole of the intermediate valve via a valve, and at least one suction valve fixing structure for fixing the suction valve at the correct position to the intermediate valve is provided. The fixing structure of the suction valve is formed with at least one locking groove having a locking jaw at the front outer periphery of the intermediate valve, and the positioning piece inserted into the locking groove of the intermediate valve extends in a predetermined portion of the suction valve. A suction valve fixing structure of a linear compressor is provided.

As an embodiment of the intake valve fixing structure, it is a concave-convex coupling structure that is formed to be joined to each other in the piston and the intermediate valve.

In addition, as another embodiment for achieving the object of the present invention, the key groove is formed in the pin hole of the piston, the key groove is formed in the fixing hole of the suction valve, the key is coupled to the key groove of the suction valve and the piston in the piston pin And a piston pin is inserted into the pin hole of the piston through the suction valve, and the end of the piston pin protruding into the piston is fixed by caulking.

Hereinafter, the suction valve fixing structure of the linear compressor according to the present invention will be described according to the embodiment shown in the accompanying drawings.

13 (a) and 13 (b) show an embodiment of the suction valve fixing structure of the linear compressor according to the present invention. FIG. 13 (a) is a front view of the piston to which the suction valve is fixed, and the thirteenth (b) is AA sectional drawing.

As shown in this, according to one embodiment of the intake valve fixing structure according to the present invention, a predetermined depth, for example, 0.1-0.5 on one side of the front outer peripheral portion of the piston 31 To form a locking groove (32) having locking jaws (32a) (32a ') on both sides to a depth, and to a predetermined portion of the intake valve 41 is fixed to the piston pin 33 in the front center portion of the piston (31) It is constructed by extending the positioning piece 42 inserted into the engaging groove 32 of the piston 31.

The intake valve 41 is formed by line symmetry of the suction opening and closing portions 43 and 43 for opening and closing the piston holes 31a and 31a formed on the front surface of the piston 31, and the piston pin 34 at the center portion thereof. Fixing hole 44 for fixing the is formed, the positioning piece 42 extends in the radial direction passing between the suction opening and closing portions 43, 43.

In the suction valve fixing structure according to the embodiment of the present invention described above, a locking groove 32 having locking jaws 32a and 32a 'is formed at a predetermined front surface of the piston 31, and the suction valve 41 is formed. Since the positioning piece 42 is formed to extend to the piston, when the suction valve 41 is fixed to the piston 31 using the piston pin 33, the positioning piece 42 of the suction valve 41 Since the hooking jaw 32a (or 32a ') formed in the catching groove 32 of the piston 31 is caught, the suction valve 41 can be fixed at a more accurate position, and the suction valve 41 can be sucked even during operation. This prevents the valve 41 from randomly flowing and rotating, thereby improving the reliability of the intake valve 41.

14 shows another embodiment of the intake valve fixing structure shown in FIG. 13. The width of the positioning piece 42 is increased, and the engaging portions 42a and 42a 'are provided at both end portions thereof. Respectively formed and formed by engaging grooves 34 and 35 having locking jaws 34a and 35a on both sides of the front outer periphery of the piston 31, respectively, to define the width of the positioning piece 42. There is an advantage of making it wider and reinforcing the strength of the intake valve 41.

15 (a) and 15 (b) show another embodiment of the intake valve fixing structure according to the present invention, wherein the piston 31 and the intake valve 41 are unevenly coupled. The suction valve 41 is fixed to the piston 31 by the piston pin 33 in the state coupled by 36, and is comprised.

The concave-convex coupling structure 36 is formed in at least one or more coupling grooves 37 formed in the front predetermined portion of the piston 31 and in the predetermined portion of the rear surface of the suction valve 41 and the coupling groove 37. It is composed of at least one coupling protrusion 45 to be mated with. However, the forming portion of the engaging groove 37 and the engaging projection 45 is not necessarily limited to the embodiment shown in the drawings, on the contrary, forming the engaging projection 45 on the piston 31, the intake valve 41 Coupling grooves 37 may be formed in the grooves to join each other.

The portion formed in the suction valve 41 of the uneven coupling structure 36, that is, the coupling protrusion 45 is preferably formed at a portion where the deformation of the suction valve 41 does not occur, and the number thereof is not limited.

The suction valve fixing structure according to another embodiment of the present invention described above is suctioned to the piston pin 33 in a state in which the piston 31 and the suction valve 41 are in close contact with each other by the uneven coupling structure 36. The valve 41 is fixed to the piston 31 more accurately and firmly.

On the other hand, Figure 16 (a) and Figure 16 (b) shows another embodiment of the intake valve fixing structure according to the present invention, between the piston 31 and the intake valve 41 of the piston 31 The valve holes 51a and 51a are formed in communication with the piston holes 31a and 31a and opened and closed by the suction opening and closing portions 43 and 43, and are interposed between the disk-shaped intermediate valve 51 having a predetermined thickness. The intermediate valve 51 and the suction valve 41 are fixed by the piston pin 33, and the suction valve fixing structure shown in FIG. 13 is attached to the suction valve 41 and the intermediate valve 51, or FIG. The intake valve fixing structure shown in FIG. 1 is applied to fix the intake valve 41.

That is, a locking groove 52 having locking jaws 52a and 52a 'is formed at both sides with a predetermined depth on one side of the front outer periphery of the intermediate valve 51, and a piston ( 31 is formed by extending the positioning piece 42 to be inserted into the engaging groove 32 of the 31, or to form the concave-convex coupling structure 36 'to be joined to each other in the suction valve 41 and the intermediate valve 51 In this case, the intake valve 41 is fixed.

At this time, the concave portion 31b is formed on the front surface of the piston 31 in which the piston holes 31a and 31a are formed to have a predetermined depth to allow the flow of the refrigerant. In another embodiment of the present invention described above, a case where the suction valve fixing structure shown in FIG. 13 or the suction valve fixing structure shown in FIG. 15 is applied to the suction valve 41 and the intermediate valve 51 will be described. However, as shown in FIGS. 16 (a) and 16 (b), when applied together, reliability of the intake valve 41 can be further improved.

On the other hand, Figure 17 shows another embodiment of the intake valve fixing structure according to the present invention, the circular fastening portion 46 and the piston 31 for fastening the piston pin 33 to the intake valve 41 An annular opening / closing portion 47 for opening and closing the piston holes 31a and 31a of the piston hole, and connecting the fastening portion 46 and the opening and closing portion 47 to the connecting portion 48. When the valve 41 is fixed to the piston 31 by the piston pin 33, the opening / closing part 47 is always the piston hole 31a of the piston 31 even when the fixed position of the intake valve 41 is slightly misaligned. Since 31a is blocked, the function of the intake valve 41 is sufficiently performed.

On the other hand, Figure 18 shows another embodiment of the intake valve fixing structure according to the present invention, the intake valve 41 is applied to the conventional form shown in Figure 9, the key groove 44a in the fixing hole 44 ), A key groove (38a) is formed in the pin hole (38) formed in the front center portion of the piston 31, the key groove of the suction valve 41 to the piston pin (33) for fixing the suction valve 41 A key 33a is formed to be engaged with the 44a and the key groove 38a of the piston 31, and the piston pin 33 is engaged with the pin hole 38 of the piston 31 via the suction valve 41. In addition, the nut 39 is fastened to the rear end of the piston pin 33 protruding into the piston 31 or the piston pin 33 is fixed by a caulking operation.

The suction valve fixing structure according to still another embodiment of the present invention includes a key groove 38 formed in the pin hole 38 of the piston 31 and a key groove 44 a formed in the fixing hole 44 of the suction valve 41. ) In combination with the piston pin 33 having the key 33a formed therein, and then tightening the nut 39 to the piston pin 33 protruding into the piston 31, or caulking the suction valve. The 41 is firmly fixed in place.

As described above, the suction valve fixing structure of the linear compressor according to the present invention has the effect of improving the overall efficiency by fixing the suction valve at a more accurate position on the front surface of the piston to ensure sufficient reliability of the suction valve. .

Claims (5)

In a suction structure in which a piston ball of a piston is covered with a suction opening and closing portion of a suction valve, at least one locking groove having a locking step is formed at the outer peripheral edge of the piston, and a positioning piece is disposed at a predetermined portion of the suction valve. And a suction valve is fixed to the front surface of the piston with a piston pin while the end of the positioning piece is positioned in the engaging groove of the piston. A suction structure for opening and closing a piston ball of a piston with a suction opening and closing portion of a suction valve, wherein the piston and the suction valve are coupled by at least one uneven coupling structure, and the uneven coupling structure is at least one of the piston and or the suction valve. At least two engaging protrusions are formed, the coupling grooves and the engaging protrusions are coupled to each other, and the suction valve fixing structure of the linear compressor, characterized in that the intake valve is fixed with a piston pin. The suction opening and closing portion of the intake valve is formed in the valve hole of the intermediate valve via an intermediate valve having a predetermined thickness formed around the piston hole of the piston, and a valve hole communicating with the piston hole of the piston is formed on the front surface of the piston. The suction valve is fixed to the intake valve with a piston pin, and at least one suction valve fixing structure is formed on the intermediate valve to fix the suction valve at the correct position, and the suction structure of the suction valve is formed on the front outer periphery of the intermediate valve. At least one engaging groove having a locking step is formed in the suction valve fixing structure of the linear compressor, characterized in that the positioning piece to be inserted into the engaging groove of the intermediate valve is formed in a predetermined portion of the suction valve. 4. The suction valve fixing structure of a linear compressor according to claim 3, wherein the suction valve fixing structure is a concave-convex coupling structure which is formed so as to be joined to the piston and the intermediate valve, respectively. A key groove is formed in the pin hole of the piston, a key groove is formed in the fixing hole of the intake valve, and a key that is coupled to the suction valve and the key groove of the piston is formed in the piston pin, and the piston pin is formed as a pin hole of the piston through the suction valve. And an end portion of the piston pin which protrudes into the piston and is fixed by caulking.