KR20070093765A - Head cover for a hermetic compressor and valve assembly using the same - Google Patents

Abstract

A head cover for a hermetic compressor and a valve assembly using the same are provided to integrally form a valve movement control element and a valve fixing element to the head cover to simplify the structure of the valve assembly, thereby manufacturing the valve assembly in a short time at a low cost. A head cover for a hermetic compressor includes a main body(81) having an indentation(83) in a predetermined shape and covering a front end of a cylinder block, and a valve movement control element(85) having a connection part(85a) positioned at a side of the indented portion of the main body and protruded therefrom to the center of the main body by a predetermined distance and a circular protrusion part(85b) protruded in the opposite direction of the indentation of the header cover. A valve fixing element(87) is positioned at the other side of the indented portion of the main body and protruded therefrom in the opposite direction of the indentation.

Description

Head Cover For A Hermetic Compressor and Valve Assembly Using the same}

1 is a cross-sectional view showing the internal configuration of a hermetic compressor according to the prior art.

Figure 2 is a perspective view showing the configuration of the head cover and the valve assembly according to the prior art.

Figure 3 is a perspective view showing the configuration of the valve assembly according to the prior art.

Figure 4 is an exploded perspective view showing a part of a preferred embodiment of the head cover and the valve assembly using the same of the hermetic compressor according to the present invention.

5 is an exploded perspective view showing the configuration of a preferred embodiment of the valve assembly using the head cover of the hermetic compressor according to the present invention.

   * Description of the symbols for the main parts of the drawings *

81: head cover main body 83: recessed portion

85: valve behavior control part 87: valve fixing end

The present invention relates to a hermetic compressor, and more particularly, to a head cover for shielding the tip of a cylinder block and a valve assembly using the same.

Figure 1 shows the internal configuration of a conventional hermetic compressor according to the prior art.

As shown in the drawing, the sealed container 1 is composed of an upper container 1t and a lower container 1b, and a frame 2 is installed inside the sealed container. The frame 2 is supported inside the sealed container 1 by a spring 2S, and the stator 3 is fixed to the frame 2. The crankshaft 5 is provided through the center of the frame 2. The crankshaft 5 is integrally provided with a rotor 4, and the rotor 4 is rotated together with the crankshaft 5 by electromagnetic interaction with the stator 3.

An eccentric pin 5b is provided at the upper end of the crankshaft 5. The eccentric pin 5b is eccentrically installed at the center of rotation of the crankshaft 5. A counterweight 5c is formed on the opposite side in the longitudinal direction at the point where the eccentric pin 5b is installed. In FIG. 1 a passage formed inside the crankshaft 5 for supplying oil L is shown by reference 5a.

A cylinder block 6 having a compression chamber 6 'is formed integrally with the frame 2 at a point spaced apart from the eccentric pin 5b. A piston 7 is installed in the compression chamber 6 ', and the piston 7 is connected to the eccentric pin 5b of the crankshaft 5 and the connecting rod 8. At the front end of the cylinder block 6, a valve assembly 9 is installed to control the working fluid flowing into and out of the compression chamber 6 '. In the valve assembly 9, a head cover having a space for compressing a working fluid is located on a surface opposite to a surface on which the front end of the cylinder block 6 is located. In addition, a silencer 11 is installed in connection with the head cover 10 to reduce noise generated by the working fluid.

As shown in FIG. 1, a pumping mechanism 5d for sucking oil L into the passage 5a is provided at the bottom of the crankshaft 5. In addition, a suction pipe 12 for delivering the working fluid to the inside of the sealed container 1 and a discharge pipe 13 for discharging the compressed working fluid to the outside of the compressor are provided on one side of the sealed container 1.

2 shows a configuration relating to the head cover and the valve assembly.

As shown in these figures, a head cover 10 is mounted at the tip of the cylinder block 6, and a valve assembly 20 to be described below is provided between the cylinder block 6 and the head cover 10. do.

The lower end of the cylinder block 6 is formed with a cylinder base (6b) that is seated on the upper surface of the frame (2). The cylinder base 6b is provided with a mounting hole 6m through which a bolt (not shown) for mounting with the frame 2 passes. The cylinder block 6 is provided with a cylinder front surface 6f on which the valve assembly 20 is mounted. In the cylinder front surface 6f, fastening holes 6h for fastening the head cover 10 and the valve assembly 20 are formed at four corners.

The head cover 10 is mounted at the tip of the cylinder block 6. The head cover 10 is to shield the front end of the cylinder block 6, the surface facing the cylinder block 6 is recessed in a predetermined shape to form a discharge chamber (10a). The discharge chamber 10a is a space where the working fluid is compressed and discharged. On the other side of the head cover, a suction muffler seating portion 10b recessed to correspond to the shape of the suction muffler (not shown) is formed. A suction muffler (not shown) is seated in the suction muffler seating portion 10b, and a working fluid flows into the compression chamber 6 'through an inside of the suction muffler (not shown).

A retainer crimping portion 15 is formed at a predetermined position around the inlet of the portion recessed in the discharge chamber 10a. The retainer crimping portion 15 is a portion formed to crimp both ends of the retainer 39 to be described below, and is divided into a first crimping portion 15a and a second crimping portion 15b. The first crimping portion 15a is a portion for crimping the first fixed end 39a of the retainer 39 to be described below, and the second crimping portion 15b is the second fixed end 39b of the retainer 39. ) Is the part to compress. The first crimping portion 15a and the second crimping portion 15b are formed at positions corresponding to upper surfaces of both ends of the retainer 39. A bolt through hole (H) is formed at the edge of the head cover (10) and the bolt penetrates through the bolt through hole (H) and is bound to the cylinder block (6).

Between the cylinder front surface 6f and the head cover 10, as shown in FIG. 3, a suction plate 21, a valve plate 31 and a gasket 41 are sequentially installed.

The suction plate 21 is located on the front surface 6f of the cylinder, and the suction plate 21 and the suction plate 21 selectively block the suction port 33 of the valve plate 31 to be described below. There is a discharge hole 25 drilled in communication with the seal 6. The discharge hole 25 is a passage through which the working fluid is sucked into the head cover 10.

The valve plate 31 is located on the rear surface of the suction plate 21 in contact with the cylinder front surface 6f. The valve plate 31 is provided with a suction port 33, which is a passage through which a working fluid is sucked into the compression chamber 6 ', and a recess 35 recessed in a predetermined shape. The groove 35 is provided with a discharge port 35 ′ through which the working fluid is discharged, and the discharge port 35 ′ is formed at a position corresponding to the discharge hole 25 formed in the suction plate 21.

In addition, the groove 35 is seated in the discharge valve 37, the valve spring 38, the retainer 39 in order. The discharge valve 37 installed on the bottom of the groove 35 is sucked into the compression chamber 6 'through the suction port 33 so that the compressed working fluid is discharged through the discharge port 35'. To control. The valve spring 38 is located on the upper surface of the discharge valve 37, the valve spring 38 assists the opening and closing operation of the discharge valve 37 by the elastic force.

A retainer 39 is positioned on the upper surface of the valve spring 38. The retainer 39 fixes one end of the discharge valve 37 and the valve spring 38 to the groove 35 and limits the behavior of the discharge valve 37. A first fixing portion 39a is formed at one end of the retainer 39 seated at a position where the discharge port 35 'is located. The front end of the first fixing part 39a is pressed by the first pressing part 15a of the head cover 10, and the second fixing part 39b is the second pressing part of the head cover 10. It is crimped | bonded by 15b. Both ends of the retainer 39 are fixed by the fixing parts 39a and 39b, but the center part thereof is formed to protrude upward, that is, in a direction opposite to the recessed direction of the groove 35, so that the discharge valve 37 is spaced apart. There is a space available.

A gasket 41 is positioned on the rear surface of the valve plate 31 in contact with the suction plate 21. The gasket 41 serves to prevent the leakage of the working fluid between the valve assembly 20 and the head cover 10. The gasket 41 includes a suction hole 43 formed corresponding to the suction port 33 and a plate hole 45 having a predetermined shape.

Bolting holes H are formed at the corners of the plates 21, 31, and 41 constituting the valve assembly 20 to allow the bolts B to pass therethrough. The valve assembly 20 is coupled between the head cover 13 and the cylinder block 6 by the bolt through hole (H).

However, the valve assembly according to the prior art as described above has the following problems.

The valve plate 31 constituting the valve assembly 20 is provided with a plurality of components such as a discharge valve 37, a valve spring 38, and a retainer 39. Therefore, there is a problem that the increase in manufacturing cost increases, such as the number of parts constituting the valve assembly 31 as a whole, the number of assembly labor.

In addition, when the working fluid flows through the groove 35 'of the valve plate 31 to the discharge chamber 10a, the flow of the working fluid is disturbed by the retainer and the spring of the valve plate. There is a problem that the flow is not made.

The present invention is to solve such a conventional problem, it is an object of the present invention to improve the structure of the head cover to simplify the configuration of the components constituting the valve plate.

Another object of the present invention is to smoothly flow the working fluid from the valve assembly to the discharge direction of the head cover.

According to a feature of the present invention for achieving the above object, the head cover body which is recessed in a predetermined shape and shields the front end of the cylinder block, and located on one side of the recessed portion of the head cover body, the head cover A valve behavior restriction portion is formed by protruding a predetermined distance toward the center of the head cover body from one side of the concave portion of the main body, and the other side of the concave portion of the head cover body located on the other side And a valve fixing end formed to protrude in a direction opposite to the recessed direction of the head cover body.

The valve behavior restricting portion, a connection portion protruding a predetermined distance in the center direction from one side of the recessed portion of the head cover, and is located at the tip of the connecting portion, protrudes in the opposite direction to the recessed direction of the head cover in a circular protrusion shape It is formed including a protrusion having a.

A head cover having a valve behavior regulation portion formed at one side of the recessed portion and a valve fixing end portion formed at the other side thereof, and a discharge valve having a rear end fixed by the valve fixing end and having a rear end limited by the valve behavior regulation portion. And a valve assembly having a valve plate having a recess in which the discharge valve is seated.

The valve assembly further includes a suction plate for selectively shielding the working fluid flowing into the head cover, and a gasket for preventing the outflow of the working fluid flowing into the head cover.

The discharge valve is formed at one end of the discharge valve, a free end for selectively shielding the working fluid flowing into the head cover, and formed at the other end of the discharge valve, seated on one side of the groove of the valve plate It comprises a fixed wing that is fixed.

In the groove formed on one side of the valve plate, a fixed wing seat is formed to correspond to the shape of the fixed blade of the discharge valve to seat the fixed blade of the discharge valve.

The protrusion of the valve behavior restricting portion formed on one side of the head cover is formed of a curved portion formed in a curved shape so that the circumference of the protrusion is round, and a discharge valve seat portion having a flat central portion of the protrusion and a free end of the discharge valve seated thereon.

The protrusion of the valve behavior restricting portion of the head cover is formed with a diameter whose diameter is relatively smaller than the diameter of the discharge port formed in the groove of the valve plate.

The valve fixing end of the head cover, the head cover of the hermetic compressor, and the valve assembly using the same, characterized in that it is formed corresponding to the shape of the fixed blade seating portion of the groove in which the fixed blade of the discharge valve is seated.

According to the present invention, the configuration of the valve plate is simplified to reduce the manufacturing cost and manufacturing time, the structure of the head cover and valve plate is improved, the working fluid flows smoothly, the overall efficiency of the compressor is improved have.

Hereinafter, a preferred embodiment of the head cover of the hermetic compressor and the valve assembly using the same according to the present invention will be described in detail with reference to the accompanying drawings.

4 and 5 illustrate a preferred embodiment of the head cover of the hermetic compressor and the valve assembly using the same according to the present invention.

As shown, a suction plate 51 is provided at the front of the cylinder, and a suction valve 53 and a discharge hole 55 are formed in the suction plate 51. And a valve plate 61 is provided on the rear surface of the suction plate 51. A recess 65 is formed in the valve plate 61. On one side of the groove 65 is a fixed wing seating portion (65s) is formed. The fixed blade seating portion 65s is formed corresponding to the shape of the fixed blade 67w to be described below.

  A discharge valve 67 is seated in the groove 65. A fixed blade 67w is formed at one end of the discharge valve 67, and the fixed blade 67w is seated on the fixed blade seating portion 65s formed in the groove 65. The other end of the discharge valve 67 is formed as a free end 67f to selectively shield the inflow of the working fluid. The valve plate 61 is further provided with a suction port 63 and a discharge port (65 ').

A gasket 71 is provided on the rear surface of the valve plate 61. Suction holes 73 are formed in the gasket 71. Each component of the above-mentioned valve assembly has the same functions and actions as described in the prior art.

The rear surface of the gasket 71 is provided with a head cover 80 to shield the front end of the cylinder block. The head cover 80 is provided with a substantially rectangular head cover body 81. A bolt through hole (H) is formed at the edge of the head cover body (81) of the head cover (80) and bolts (not shown) pass through it and are bound to the cylinder block.

In the head cover body 81, the surface facing the cylinder block is recessed into a predetermined shape to form a recess 83. The concave inlet portion 83 is composed of a suction muffler seating portion 83a and a discharge chamber 83b. The suction muffler seating portion 83a is a space in which one side of the suction muffler is seated, and the discharge chamber 83b is a space in which the working fluid discharged from the compression chamber temporarily stays. The suction muffler seating portion 83a and the discharge chamber 83b are completely separated from each other so that the working fluid does not move between the suction muffler seating portion 83a and the discharge chamber 83b.

The suction muffler seating portion 83a has a suction muffler seated therein and communicates with the suction hole 73 of the gasket 71 and the suction port 63 of the valve plate 61 to flow into the suction muffler. Working fluid flows into the compression chamber. The discharge chamber 83b communicates with the discharge port 65 'of the valve plate 61 and the discharge hole 55 of the suction plate 51 so that the working fluid introduced into the compression chamber is discharged to the discharge chamber 83b. Flows into.

A valve behavior restricting portion 85 is provided at one inlet side of the recessed portion of the discharge chamber 83b. The valve behavior restricting portion 85 restricts the behavior of the free end 67f of the discharge valve 67 seated in the recess 65 of the valve plate 61. Therefore, the valve behavior control portion 85 is preferably formed at the corner of the position close to the front end of the discharge valve (67). As shown in the partial perspective view of FIG. 4, the valve behavior restricting portion 85 includes a connection portion 85a extending from a corner of the concave portion 83 by a predetermined length in an inner center direction of the concave portion 83. ) Is formed. The tip of the connecting portion 85a extends from the discharge valve 67 seated on the valve plate to a position corresponding to the free end 67f.

At the distal end of the connecting portion 85a, a protrusion 85b protruding outside the head cover 81, that is, protruding by a predetermined length in a direction opposite to the direction in which the head cover 81 is recessed, is formed. As shown in the partial perspective view of FIG. 4, a rounded curved portion 85r is formed around the protrusion 85b and a flat discharge valve seating portion 85f is formed on the upper surface thereof. The diameter of the upper surface of the protrusion 85b is smaller than the diameter of the discharge port 65 ′ of the valve plate 61. Therefore, when the free end 67f of the discharge valve 67 is separated by the working fluid, the circumference of the free end 67f of the discharge valve 67 is the flow direction of the working fluid by the curved portion 85r. The central portion of the free end 67f of the discharge valve 67 is seated in the discharge valve seating portion 85f. In addition, the degree of limiting the behavior of the discharge valve 67 may vary depending on the thickness of the protrusion 85b.

The valve fixing end 87 is formed at the other side of the inlet of the recessed portion of the discharge chamber 83b. Since the valve fixing end 87 is for fixing the fixed blade 67w of the discharge valve 67, it is formed at a position corresponding to the position where the fixed blade 67w is formed. The valve fixing end 87 protrudes a predetermined length in the opposite direction to the outside of the head cover 81, that is, the direction in which the head cover 81 is recessed. The shape of the valve fixing end 87 and the shape of the fixed blade seating portion (65s) of the groove 65 in which the fixed blade (67w) of the discharge valve 67 is seated in the groove (65) of the valve plate (71). Correspondingly formed. Therefore, the protrusion of the valve fixing end 87 is seated on the fixing blade seating portion 65s of the groove 65 in which the fixing blade 67w of the discharge valve 67 is seated in the valve plate 71. The valve fixing end 87 is preferably formed with a predetermined protrusion thickness for pressing and fixing the discharge valve 67.

Hereinafter, the assembly process and operation of the head cover and the valve assembly of the hermetic compressor according to the present invention having the configuration as described above will be described in detail.

First, a valve assembly is provided between the cylinder block and the head cover 81 to control the flow of the working fluid into and out of the compression chamber. A discharge valve 67 is provided in the recess 65 of the valve plate 61 of the valve assembly. It is seated. The valve behavior restricting portion 85 of the head cover 81 is positioned above the free end 67f of the discharge valve 67, and the valve fixing end 87 is positioned on the upper surface of the fixed blade 67w. And a bolt is inserted into the bolt through hole (H) to fix the head cover 81, the valve assembly and the cylinder block. Then, the valve fixing end 87 of the head cover 81 is seated on the fixing blade seating portion 65s of the groove 65 in which the fixing blade 67w of the discharge valve 67 is seated in the valve plate 61. . Accordingly, the valve fixing end 87 is seated in the recess 65 to press and fix the upper surface of the discharge valve 67.

Subsequently, when the compressor equipped with the head cover according to the present invention is operated, a piston reciprocates linearly in the compression chamber and suctions and discharges a working fluid to the compression chamber. That is, when the piston is retracted and sucks the working fluid into the compression chamber, the working fluid stored in the suction muffler seating portion 83a of the head cover 81 is the suction hole 73, the valve of the gasket 71. It is introduced into the compression chamber 6 'through the suction port 63 of the plate 61.

On the contrary, when the piston advances and compresses the working fluid of the compression chamber, the discharge valve 67 is opened by the pressure of the working fluid so that the working fluid discharges the head cover 81 through the discharge hole 65 '. It flows into the room 85b. At this time, the free end 67f of the discharge valve 67 is seated on the discharge valve seating portion 85f of the valve behavior restricting portion 85 located above. Therefore, the behavior range of the discharge valve 67 is limited by the discharge valve seating portion 85f.

The curved portion 85r is formed around the protruding portion 85b of the valve behavior restricting portion 85 and the diameter of the protruding portion 85b is formed smaller than the diameter of the discharge port 63. In the compression stroke, the free end 67f of the discharge valve 67 is bent round in the flow direction of the working fluid. Therefore, since the circumference of the free end 67f of the discharge valve 67 is rounded while contacting the curved portion 85r, the working fluid flows smoothly into the discharge chamber 83b along the curved surface. In addition, the free end 67f of the discharge valve 67 is bent to have elasticity itself, and the free end of the discharge valve 67 is formed by the elasticity formed in the discharge valve 67 during the suction stroke of the compression chamber. 67f) returns to its original position quickly.

  In addition, the fixed blade seating portion 65s of the recess 65 in which the fixed blade 67w of the discharge valve 67 is seated in the valve plate 61 has the shape of the fixed blade seating portion 65s of the recess 65. Since the valve fixing end 87 formed to correspond to and fixes the fixed blade 67w of the discharge valve 67, the discharge valve 67 does not flow by the flow of the working fluid.

Within the scope of the basic technical idea of the present invention, many modifications are possible to those skilled in the art, and the scope of the present invention should be interpreted based on the appended claims. will be.

According to such a head cover and valve assembly of the hermetic compressor according to the present invention, the following effects are expected.

According to the head cover according to the present invention, the valve behavior restricting portion and the valve fixing end replacing the retainer and the valve spring are integrally formed in the head cover to simplify the structure of the valve assembly. Therefore, there is an advantage that can reduce the manufacturing cost and manufacturing time required to manufacture the parts constituting the valve assembly.

In addition, since some of the components of the valve assembly are excluded, the interference of the components is eliminated, and the working fluid discharged through the discharge port can flow smoothly. In addition, since the diameter of the free end of the discharge valve is larger than the diameter of the protrusion and the protrusion is formed in a curved shape, the free end of the discharge valve is bent roundly during compression stroke, so that the working fluid is inside the discharge chamber along the rounded curved surface of the discharge valve. Flows more smoothly. In addition, since the free end of the discharge valve quickly returns to its original position during the suction stroke by the elastic force generated at the bent free end of the discharge valve, the flow of the working fluid is quickly blocked. Therefore, since the flow of the working fluid is smooth and the suction stroke and the compression stroke are repeated within a fast time, the compression effect of the compressor is increased to improve the efficiency of the compressor due to the flow of cold air as a whole.

Claims (9)

A head cover body recessed in a predetermined shape and shielding the tip of the cylinder block; A valve behavior control part disposed on one side of the recessed portion of the head cover body and protruding a predetermined distance from one side of the recessed portion of the head cover body toward the center of the head cover body; And a valve fixing end disposed on the other side of the recessed portion of the head cover body and protruding from the other side of the recessed portion of the head cover body in a direction opposite to the recessed direction of the head cover body. Head cover. The method of claim 1, wherein the valve behavior control unit, A connection part protruding a predetermined distance toward the center from one side of the recessed portion of the head cover; Located in the front end of the connecting portion, the head cover of the hermetic compressor, characterized in that it comprises a projection having a projection shape protruding in the opposite direction to the recessed direction of the head cover. The method of claim 2, wherein the protrusions, A curved portion formed in a curved shape with a round circumference, Head cover of the hermetic compressor characterized in that it comprises a discharge valve seating portion is formed flat in the center. A valve plate in which grooves of a predetermined shape are formed; A discharge valve installed in the groove of the valve plate and having a free end having a restricted behavior and a fixed wing fixed to the groove of the valve plate; A valve behavior regulating portion provided at one side of the head cover to limit the behavior of the free end of the discharge valve; The valve assembly of the hermetic compressor provided on the other side of the head cover, comprising a valve fixing end for fixing the fixed blade of the discharge valve. The method of claim 4, wherein the valve assembly, A suction plate for selectively shielding a working fluid flowing into the head cover; The valve assembly of the hermetic compressor, characterized in that the gasket further prevents the outflow of the working fluid flowing into the head cover. According to claim 5, In the groove formed on one side of the valve plate, The valve assembly of the hermetic compressor characterized in that the fixing blade seating portion is formed corresponding to the shape of the fixed blade of the discharge valve is seated to the fixed blade of the discharge valve. According to any one of claims 4 to 6, Protruding portion of the valve behavior restriction portion formed on one side of the head cover, The valve assembly of the hermetic compressor, characterized in that the curved portion formed rounded around the protrusion and the center portion of the protrusion is flat and the discharge valve seating portion is seated on the free end of the discharge valve in the compression stroke. The method of claim 7, wherein the protrusion of the valve behavior restriction portion of the head cover, A valve assembly of a hermetic compressor, wherein the diameter is formed to be smaller than the diameter of the discharge port formed in the groove of the valve plate. The method of claim 8, wherein the valve fixing end of the head cover, The valve assembly of the hermetic compressor, characterized in that formed in correspondence with the shape of the fixing blade seating portion of the groove in which the fixed blade of the discharge valve is seated to compress the fixed blade of the discharge valve in the fixed blade seat.

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