JP3068048B2 - Linear compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear compressor, and more particularly, to a linear compressor in which the structure of a cylinder and a piston is improved to improve the operation stability of the piston.

[0002]

2. Description of the Related Art Generally, a compressor is used for compressing a refrigerant to a high temperature and a high pressure in a refrigerating apparatus or the like which continuously performs compression, condensation, expansion and evaporation processes using a refrigerant as a working fluid. Among such compressors, linear compressors are:
A linear motor that interacts electromagnetically with a change in the direction of a magnetic flux is provided to linearly reciprocate a piston.

FIG. 1 is a sectional view showing a conventional linear compressor. As shown in FIG. 1, a cylinder block 15a and a cylinder block 15a are formed so as to form a compression chamber 14 inside a sealed container 10 forming an external appearance. A cylinder 15 including a cylinder head 15b is provided, and a piston 13 is provided in the compression chamber. A linear motor 11 is provided in the cylinder block 15a. The linear motor 11 is disposed between the primary stator 11a and the secondary stator 11b, which are separately provided on the outside and the inside, and is disposed between the stators 11a and 11b. It includes a permanent magnet 11c and a coil 11d. Piston 1
3, a flange 12 is fixed to the lower part of this flange 1.
A permanent magnet 11c that forms a part of the linear motor 11 is integrally provided with the linear motor 2, and reciprocates up and down linearly with the piston 13. A cylinder head 15b including a suction chamber 19 and a discharge chamber 20 is provided above the cylinder block 15a. A suction valve 17 and a discharge valve 1 are provided between the cylinder head 15b and the cylinder block 15a.
8 are provided, respectively. A leaf spring 21 is provided below the piston 13 to elastically support the piston 13 and perform a vertical movement.

However, in such a conventional linear compressor, the piston 13 reciprocates linearly inside the cylinder 15 by the electromagnetic force of the linear motor 11, but at this time, the piston 13 always moves in a predetermined moving area, That is, it is desirable to reciprocate constantly between the top dead center and the bottom dead center, but it is difficult to keep the moving area of the piston 13 constant due to factors such as an increase in the internal temperature of the sealed container 10, voltage fluctuations, and external impact. .

In particular, it often occurs that the piston 13 exceeds the predetermined top dead center and the upper part of the piston 13 collides with the valve plate 16 during the upward stroke of the piston 13 for compressing and discharging the refrigerant. . If this collision continues to occur, the piston 13 and the valve plate 16 will eventually be damaged, and the compressor will not be able to operate.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention has been devised in view of the above-mentioned circumstances, and has as its object the purpose of adding the piston and the valve plate when the piston collides with the valve plate beyond the moving area. An object of the present invention is to provide a linear compressor capable of preventing damage to parts by reducing impacts to be received and improving operational stability of a piston.

[0007]

In order to achieve the above-mentioned object, the present invention provides a closed container, a cylinder constituted by a cylinder block and a cylinder head for forming a compression chamber inside the closed container, and A linear motor fixed to a cylinder, a piston provided inside the cylinder and operated by the linear motor, a discharge port for guiding the discharge of the refrigerant compressed in the compression chamber, and a discharge valve for opening and closing the discharge port. And a valve plate provided in the cylinder, wherein the cylinder is provided with a shock absorbing means for reducing an impact applied to the piston and the valve plate at the time of collision between the piston and the valve plate. It is characterized by the following.

[0008] Further, the shock-absorbing means is characterized in that both ends thereof are constituted by springs fixed to the inner surface of the cylinder head and the valve plate, respectively.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a linear compressor according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 is a cross-sectional view showing a linear compressor according to the present invention, and FIG. 3 is an enlarged view of a portion 'A' of FIG.

As shown in FIG.
Is provided. Sealed container 50
Inside the cylinder 5, a cylinder 5 constituted by a cylinder block 55a and a cylinder head 55b so as to form a compression chamber 54.
The compression chamber 54 is provided with a piston 53. The linear motor 5 is mounted on the cylinder block 55a.
1, the linear motor 51 includes a primary stator 51a and a secondary stator 51b which are separated outside and inside, a permanent magnet 51c and a coil 51d disposed between the stators 51a and 51b. A flange 52 is fixed to a lower portion of the piston 53, and a permanent magnet 51c forming a part of the linear motor 51 is provided on the flange 52 at a fixed position. A leaf spring 57 is provided below the piston 53 to resiliently support the piston 53 and perform a vertical movement.

The piston 53 is provided in a hollow cylindrical shape, and a first flow is provided at one lower side of the piston 53 so that the refrigerant flowing into the closed vessel 50 through the suction pipe 50a flows into the piston 53. An inlet 53a is formed, and a second inlet 53b through which the refrigerant inside the piston 53 flows into the compression chamber 54 is formed at an upper portion. Also,
An inflow valve 53c for controlling the refrigerant flowing into the compression chamber 54 through the second inflow port 53b is fixed outside the upper portion of the piston 53 to open and close the second inflow port 53b.

The cylinder head 55b is provided above the cylinder block 55a, and a valve plate 56 is provided between the cylinder head 55b and the cylinder block 55a. The valve plate 56 has a discharge port 56a for guiding the discharge of the compressed refrigerant, and the discharge port 56a.
A discharge valve 56b that opens and closes is provided. A projection 59 for guiding the movement of the valve plate 56 protrudes from the inner surface of the cylinder head 55b toward the valve plate 56. A spring 58 is provided inside the projection 59 as a damping means. It is fixed to the inner surface of the cylinder head 55b and the valve plate 56, which will be described later. Also, one side of the projection 59 is provided with the compression chamber 5.
A cutout portion 59a is formed to guide the refrigerant discharged from the discharge port 4 through the discharge port 56a to the discharge pipe 60 connected to the cylinder head 55b.

FIG. 4 is a cross-sectional view of the linear compressor according to the present invention during the suction stroke of the piston. According to FIG.
When the piston 53 moves downward to a predetermined bottom dead center by the electromagnetic force of the linear motor 51 during the suction stroke, the discharge valve 56b provided on the valve plate 56 closes, and the piston 53
Is opened. Accordingly, the refrigerant flowing into the piston 53 flows into the compression chamber 54 through the second inlet 53b.

FIG. 5 is a cross-sectional view of the linear compressor according to the present invention during the discharge stroke of the piston. According to FIG.
The piston 53 that has descended to the bottom dead center for the suction of the refrigerant rises again to the predetermined top dead center by the electromagnetic force of the linear motor 51, thereby compressing the refrigerant inside the compression chamber 54. The inflow valve 53c provided in the piston 53 is kept closed. Piston 5
When the refrigerant is compressed by the rise of 3 and reaches a predetermined pressure, the discharge valve 56b provided on the valve plate 56 is opened by the pressure of the compressed refrigerant, so that the compressed refrigerant is discharged from the cylinder head 55b through the discharge port 56a. After flowing into the inside, the discharge pipe 60 passes through the cutout 59 a of the projection 59.
Will be guided to.

At this time, as described above, the valve plate 56 is supported by a buffer means provided between the valve plate 56 and the cylinder head 55b, that is, a spring 58. The elastic coefficient of the spring 58 is compressed. Provision should be made to withstand the pressure generated by the compression of the refrigerant inside the chamber 54. This is because the spring 58 cannot withstand the pressure of the compression chamber 54 and the valve plate 56
This is because, if it moves to the b side, it is difficult to smoothly compress the refrigerant.

On the other hand, the piston 53 linearly reciprocates between a predetermined top dead center and a bottom dead center by the action of the electromagnetic force of the linear motor 51 to repeatedly perform the suction, compression and discharge strokes of the refrigerant. However, it is difficult to keep the movement area of the piston 53 constant due to factors such as an increase in the internal temperature of the sealed container 50, voltage fluctuation, and external impact. In more detail, when the piston 53 for compressing and discharging the refrigerant is in a rising stroke, the piston 53 may exceed a predetermined top dead center and the upper part of the piston 53 may collide with the valve plate 56. The piston 5
3 and the valve plate 56 are damaged, and the compressor cannot operate.

FIG. 6 is a cross-sectional view showing a collision between the piston and the valve plate of the linear compressor according to the present invention, and the process of reducing the impact due to the collision between the piston and the valve plate will be described.

When the piston 53 moves upward, the closed container 1
If the valve plate 56 collides with the valve plate 56 beyond the top dead center due to internal or external factors such as an internal temperature rise and an external impact, the elastic force of a spring 58 serving as a buffer means for supporting the valve plate 56 is provided. And moves toward the cylinder head 55b along the protrusion 59. Thereafter, when the piston 53 is lowered, the valve plate 56 is restored to the original state by the elastic force of the spring 58. In this way, even if the piston 53 collides with the valve plate 56, the spring 58 absorbs the shock applied to the valve plate 56, thereby preventing the piston 53 and the valve plate 56 from being damaged. On the other hand, other than a spring, a buffer member having an elastic force, such as rubber, can be used as buffer means for reducing the impact applied to the piston 53 and the valve plate 56.

[0019]

As described above, in the linear compressor according to the present invention, the spring is used to support the valve plate, so that even when the piston collides with the valve plate beyond a predetermined moving range, the spring can be used. By absorbing the impact, damage to the piston and the valve plate can be prevented, the operation stability of the piston can be improved, and the operation of the compressor can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a conventional linear compressor.

FIG. 2 is a sectional view showing a linear compressor according to the present invention.

FIG. 3 is an enlarged view of an 'A' part of FIG. 2;

FIG. 4 is a cross-sectional view showing a piston during a suction stroke of a linear compressor according to the present invention.

FIG. 5 is a cross-sectional view showing a piston during a discharge stroke of the linear compressor according to the present invention.

FIG. 6 is a cross-sectional view showing a state where a piston and a valve plate of the linear compressor according to the present invention collide with each other.

[Explanation of symbols]

 50 airtight container 50a suction pipe 51 linear motor 51a primary stator 51b secondary stator 51c permanent magnet 52 flange 53 piston 53a first inlet 53b second inlet 53c inflow valve 54 compression chamber 55 cylinder 55a cylinder block 55b cylinder head 56 Valve plate 56a Discharge port 56b Discharge valve 57 Leaf spring 58 Spring 59 Projection 59a Cutout 60 Discharge pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F04B 39/00 F04B 39/12 F04B 35/04

Claims (4)

(57) [Claims] 1. A closed container, a cylinder formed of a cylinder block and a cylinder head so as to form a compression chamber inside the closed container, a linear motor fixed to the cylinder, and provided inside the cylinder. A piston operated by the linear motor, a discharge port for guiding discharge of the refrigerant compressed in the compression chamber, a discharge valve for opening and closing the discharge port , and a cylinder head and a cylinder.
A valve plate provided between the piston and the valve plate, wherein a shock absorber applied to the piston and the valve plate at the time of collision between the piston and the valve plate is reduced. A linear compressor characterized by comprising means. 2. The cushioning means according to claim 1, wherein both ends thereof are formed by springs fixed to the inner surface of the cylinder head and the valve plate, respectively.
A linear compressor according to item 1. 3. The piston is provided in a hollow cylindrical shape, and a first inlet is provided at one side of a lower portion of the piston so that a refrigerant flowing into the closed container flows into the piston. And a second inlet for allowing the refrigerant inside the piston to flow into the compression chamber and an inlet valve for opening and closing the second inlet. A linear compressor according to item 1. 4. A protrusion for guiding the movement of the valve plate protruding from the valve plate inside the cylinder head, and a refrigerant discharged from the compression chamber through the discharge port on one side of the protrusion. The linear compressor according to claim 1, further comprising an incision part partially incised to guide the outside of the cylinder head.