JPH11210625A - Cylinder device for compressor capable of tightly fixing position of keeper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly maintain the position of a keeper even if a compressor is used for a long time by forming a fixing hole on the keeper, and arranging a fixing projection for tightly fixing the position of the keeper on a valve plate by connecting to the fixing hole. SOLUTION: Fixing holes 93 are formed on both side edge part regions of a keeper 91. A pair of fixing projections 99 for inserting into the fixing holes 93 are formed on a bottom surface of a first recessed part 41 of a valve plate 31. The fixing projections 99 are formed so as to have rectangular cross sections respectively, and the fixing projections 99 and the fixing holes 93 are tightly connected to each other. By the fixing projections 99 are connected to the fixing holes 93, the position of the keeper 91 is tightly maintained in the first recessed part 41. The position of the keeper 91 is not changed by vibration transmitted from a discharge valve lead 71 to the keeper 91, abrasion of the keeper 91, and the like even if a compressor is used for a long time. It is thus possible to prevent the positions of a stopper 81 and the discharge valve lead 71 from changing, and it is also possible to prevent reduction of an efficiency of the compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating compressor, and more particularly, to a cylinder of a hermetic reciprocating compressor in which the position of a keeper is firmly fixed to a valve plate to prevent the keeper from moving. Related to the device.

[0002]

2. Description of the Related Art Generally, a refrigeration system such as a refrigerator has a compressor for compressing a refrigerant. FIG. 1 shows an example of such a compressor, and shows a hermetic reciprocating compressor.

The compressor 1 has a casing 3 forming a closed internal space, a cylinder device 21 for compressing a refrigerant, and a drive motor 11 for driving the cylinder device 21.

The casing 3 has a suction pipe 5 into which a gaseous refrigerant flows, a discharge pipe (not shown) for discharging the refrigerant compressed by the compressor 1, and supplies power to the compressor 1. Power supply terminal 9 is provided.

The drive motor 11 includes a stator 13, a rotor 1
5 and a shaft 19 rotated by the rotor 15. When power is supplied through the power terminal 9, the drive motor 11 operates and the shaft 19 rotates. The shaft 19 has an eccentric shaft 20 at the lower end.

The cylinder device 21 includes a cylinder chamber 23
a, a cylinder head 65 provided in the cylinder body 23, a piston 25 reciprocating in the cylinder chamber 23, and a connecting rod 27 connecting the piston 25 and an eccentric shaft. The eccentric shaft 20 and the connecting rod 27 convert the rotational movement of the shaft 19 into a reciprocating movement of the piston 25.

[0007] One side of the cylinder body 23 is open, and a cylinder head 65 is provided so as to close the opened portion. On the other hand, a valve plate 31 and a suction valve lead member 61 are provided between the cylinder body 23 and the cylinder head 65.

FIG. 2 is a partially enlarged exploded perspective view of FIG.
The cylinder head 65, the valve plate 31, the suction valve lead member 61 and the like are shown.

The valve plate 31 supplies the refrigerant to the cylinder chamber 2.
3a, and a discharge hole 35 for discharging the refrigerant compressed in the cylinder chamber 23a.
have.

The suction valve lead member 61 is provided between the valve plate 31 and the cylinder body 23, and has a suction valve lead 63 cut and formed in a predetermined shape at the center thereof. The suction valve lead 63 closes the suction hole 33.

The discharge valve lead 7 is provided outside the valve plate 31.
1, a stopper 81 and a keeper 91 are provided.
A recess 40 is formed on the outer surface of the valve plate 31,
The discharge valve lead 71, the stopper 81, and the keeper 91 are housed in the recess 40.

The discharge valve lead 71 has a fixed portion 75 and an opening / closing portion 73 at both ends. The opening / closing section 73 has a function of opening and closing the discharge hole 35. The stopper 81 has a fixed part 85 and a restriction part 83. The stopper 81 is provided outside the discharge valve lead 71, and the restricting portion 83 is
Are arranged at a predetermined distance from each other. The restricting portion 83 functions to elastically restrict bending of the discharge valve lead 71 for opening the discharge hole 35. The keeper 91 is provided outside the stopper 81 and functions to fix the stopper 81 and the discharge valve lead 71 to the valve plate 31.

On the other hand, a suction muffler 37 and a gasket 36 are provided between the cylinder head 65 and the valve plate 31, and a muffler cover 62 is provided above the cylinder head 65. Muffler cover 62
Is connected to the suction pipe 5. The suction muffler 37 has a function of reducing the noise of the refrigerant sucked through the suction pipe 5. On the other hand, the gasket 36 functions to hermetically connect the cylinder head 65 and the valve plate 31.

The cylinder head 65 includes the cylinder body 23
Is fixed by a large number of bolts 66. With the cylinder head 65 connected to the cylinder body 23, the cylinder head 65 presses the gasket 36, and the gasket 36 presses both ends of the keeper 91. At this time, FIG.
As shown in FIG.
The fixing portion 75 of the discharge valve lead 71 is pressurized and fixed in the recess 40.

FIGS. 4 and 5 are enlarged sectional views showing the operating state of the cylinder device of FIG. When the drive motor 11 operates and the shaft 19 rotates, the piston 25 reciprocates in the cylinder chamber 23a. While the piston 25 moves from the top dead center (A) to the bottom dead center (B), as shown in FIG. 4, the pressure in the cylinder chamber 23a decreases and the suction valve reed 63 moves inside the cylinder chamber 23a. Bend. Thereby, the suction hole 33 is opened, and the refrigerant sucked into the suction muffler 37 through the suction pipe 5 is sucked into the cylinder chamber 23a through the suction hole 33. At this time, the opening / closing portion 73 of the discharge valve lead 71 closes the discharge hole 35 due to the negative pressure in the cylinder chamber 23a.

On the other hand, while the piston 25 moves from the bottom dead center (B) to the top dead center (A), as shown in FIG. 5, the pressure in the cylinder chamber 23a increases, and the suction valve lead 63 is sucked. The hole 33 is closed. At this time, the opening / closing portion 73 of the discharge valve lead 71 is bent outward by the high pressure in the cylinder chamber 23a, whereby the discharge hole 35 is opened. As a result, the compressed refrigerant in the cylinder chamber 23a is discharged into the cylinder head 65 through the discharge hole 35, and discharged outside through a discharge pipe (not shown) connected to the cylinder head 65. Thus, the suction, compression, and discharge of the refrigerant are continuously performed by the reciprocating motion of the piston 25.

In such a reciprocating compressor, the opening / closing operation of the discharge valve lead 71 for controlling the discharge of the refrigerant during the compression of the refrigerant must be performed precisely.
The positions and fixed states of the discharge valve lead 71, the stopper 81, and the keeper 91 must be firmly maintained.

However, in the conventional reciprocating compressor as described above, the keeper 91 is mounted on the cylinder head 65.
Further, since the pressure is simply applied by the gasket 36, there is a disadvantage that the fixed state of the keeper 91 is not firm. Therefore, when the compressor 1 is used for a long time, the position of the keeper 91 may change due to vibration transmitted from the discharge valve lead 71 to the keeper 91, wear of the keeper 91, and the like. When the position of the keeper 91 changes, the keeper 91
As a result, the positions of the stopper 81 and the discharge valve lead 71 that are pressurized and fixed change, and the discharge valve lead 71 may be damaged. Therefore, the efficiency of the compressor 1 is reduced.

[0019]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a discharge apparatus by accurately maintaining the position of a keeper even when a compressor is used for a long time, in consideration of the above-mentioned conventional problems. An object of the present invention is to provide a compressor cylinder device that can prevent breakage of a valve lead and reduction in compression efficiency.

[0020]

According to the present invention, there is provided a cylinder apparatus for a reciprocating compressor, the cylinder body forming a cylinder chamber; a cylinder head provided on the cylinder body; A valve plate provided between the cylinder head and the cylinder head, the valve plate having a discharge hole for discharging the refrigerant compressed in the cylinder chamber; and the valve plate closing the discharge hole in a region of the one end. A stopper for elastically restricting the bending of the valve lead for opening the discharge hole; and both ends thereof are fixed to the valve plate by being pressed by the cylinder head. And a keeper that presses and fixes the other end of the valve lead to the valve plate, wherein the keeper has a fixing hole. The valve plate is achieved by a cylinder device of a reciprocating compressor and having a fixing protrusion to firmly fix the position of the keeper is coupled to the fixing hole.

According to a preferred embodiment of the present invention, the pair of fixing holes are formed at both side ends of the keeper, respectively, and the valve plate has a pair of fixing protrusions respectively connected to the pair of fixing holes. .

Preferably, the valve plate has a recess for accommodating the keeper; the fixing protrusion is preferably formed on a bottom surface of the recess. According to the present invention, the movement of the keeper is prevented by the combination of the fixing projection and the fixing hole, and thus, the efficiency of the compressor is prevented from lowering.

[0023]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the description of the cylinder device of the compressor according to the present invention, the description of each part of the conventional compressor shown in FIG. 1 will be omitted. Also, the same reference numerals are given to the same parts as those of the conventional cylinder device shown in FIGS.

FIG. 6 is a partially enlarged exploded perspective view of the cylinder device according to the present invention, and FIG. 7 is an enlarged sectional view of the assembled state of FIG. Cylinder body 23 and cylinder head 65
Is provided with a valve plate 31. The valve plate 31 has a suction hole 33 for sucking the refrigerant into the cylinder chamber 23a and a discharge hole 35 for discharging the refrigerant compressed in the cylinder chamber 23a.

Outside the valve plate 31, a discharge valve lead 71, a stopper 81, and a keeper 91 are provided. The discharge valve lead 71 has a fixed portion 7
5 and an opening / closing section 73. The opening / closing part 73 is provided with the discharge hole 35
Open and close function. The stopper 81 has a fixed part 85 and a restriction part 83. The stopper 81 is the discharge valve lead 7
1, and the restricting portion 83 is disposed so as to be separated from the opening / closing portion 73 by a predetermined distance. The restricting part 83 has the ejection hole 3
It functions to elastically limit the bending of the discharge valve lead 71 for opening 5. Keeper 91 is stopper 8
1, the stopper 81 and the discharge valve lead 7
Function to fix 1.

A recess 40 is formed in the outer surface of the valve plate 31. The recess 40 is formed by recessing the first recess 41 from the plate surface of the valve plate 31, the second recess 42 formed by the bottom of the first recess 41, and the bottom of the second recess 42. And a third recess 43. The first recess 41, the second recess 42, and the third recess 43 are formed in a step shape. Discharge hole 35
Is formed in the third recess 43, and the edge protrudes so as to have the same height as the bottom surface of the second recess 42.

The discharge valve lead 71 and the stopper 81 are accommodated in the second recess 42, and the keeper 91 is accommodated in the first recess 41. Both side edges of the first recess 41 have the same shape as both side edge regions of the keeper 91, and one edge region of the second recess 42 has a fixing portion 75 of the discharge valve lead 71 and a stopper 8.
It has the same shape as the one fixing portion 85.

On the other hand, fixing holes 93 are formed in both side edge regions of the keeper, respectively.
A pair of fixing projections 99 respectively inserted into the fixing holes 93 are formed on the bottom surface of the recess 41. The fixing protrusion 99 is formed to have a rectangular cross section, and the fixing hole 93 is also formed to have a rectangular cross section.
And the fixing holes 93 are connected so as to fit each other. The keeper 9 is fixed by coupling the fixing projection 99 and the fixing hole 93.
The position 1 is firmly maintained in the first recess 41.

When the cylinder head 65 is
In this state, the cylinder head 65 presses the gasket 36, and the gasket 36 presses both ends of the keeper 91. Therefore, the keeper 91 is pressed into the first recess 41 by the cylinder head 65 and the gasket 36, and the keeper 91 fixes the fixing portion 8 of the stopper 81.
5 and the fixing portion 75 of the discharge valve lead 71 are pressed inside the second recess 42. Further, the position of the keeper 91 is firmly maintained by the fixing projections 99 and the fixing holes 93 which are mutually connected.

Therefore, even if the compressor 1 is used for a long time,
There is no change in the position of the keeper 91 due to the vibration transmitted from the discharge valve lead 71 to the keeper 91 or the wear of the keeper 91. Since the position of the keeper 91 is firmly maintained, the positions of the stopper 81 and the discharge valve lead 71 do not change, thereby preventing the discharge valve lead 71 from being damaged and the compression efficiency of the compressor 1 from being lowered.

[0031]

As described above, according to the present invention, the movement of the keeper is prevented by the combination of the fixing projection and the fixing hole, thereby preventing the efficiency of the compressor from decreasing. As described above, the present invention has been described in detail by preferred embodiments. However, those skilled in the art who have understood the above contents will easily think of changes and modifications. Therefore, the scope of the present invention should be equivalent to the scope of the claims.

[Brief description of the drawings]

FIG. 1 is a sectional view of a conventional compressor.

FIG. 2 is a partially enlarged exploded perspective view of FIG.

FIG. 3 is an enlarged sectional view of a state where the valve plate is assembled.

FIG. 4 is an enlarged sectional view showing a state where the cylinder device of FIG. 1 is performing a suction process.

FIG. 5 is an enlarged sectional view showing a state where the cylinder device of FIG. 1 is performing a compression / discharge process.

FIG. 6 is an enlarged exploded perspective view of a main part of the cylinder device according to the present invention.

FIG. 7 is an enlarged cross-sectional view of the combined state of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 21 Cylinder device 23 Cylinder body 23a Cylinder chamber 31 Valve plate 33 Suction hole 35 Discharge hole 40 Depression 61 Suction valve lead member 63 Suction valve lead 65 Cylinder head 71 Discharge valve lead 81 Stopper 91 Keeper 93 Fixing hole 99 Fixed projection

Claims (3)

[Claims] 1. A cylinder device of a reciprocating compressor, comprising: a cylinder body forming a cylinder chamber; a cylinder head provided in the cylinder body; a cylinder head provided between the cylinder body and the cylinder head; A valve plate having a discharge hole for discharging the compressed refrigerant; a valve lead provided on the valve plate so as to close the discharge hole in a region of the one end; and a valve lead for opening the discharge hole. A stopper for elastically limiting the bending of the valve lead; and both ends pressurized by the cylinder head and fixed to the valve plate. The stopper and the other end of the valve lead are added to the valve plate. The keeper includes a keeper for pressure fixing, wherein the keeper has a fixing hole, and the valve plate is coupled to the fixing hole to form the key. Cylinder device of the reciprocating compressor and having a fixing protrusion to firmly fix the position of par. 2. The fixing device according to claim 1, wherein the pair of fixing holes are formed on both side ends of the keeper, respectively, and the valve plate has a pair of fixing protrusions respectively connected to the pair of fixing holes. A cylinder device for a compressor according to item 1. 3. The cylinder according to claim 1, wherein the valve plate has a recess for accommodating the keeper; and the fixing protrusion is formed on a bottom surface of the recess. apparatus.