KR101954537B1 - Reciprocating compressor - Google Patents

Abstract

The present invention relates to a reciprocating compressor capable of preventing leakage of high-temperature high-pressure gas in a cylinder, and a reciprocating compressor according to an embodiment of the present invention includes a cylinder block having a cylinder for compressing a refrigerant by reciprocating motion of the piston, And a valve plate coupled to the cylinder block so as to communicate with the cylinder, wherein the cylinder block is formed with a circular stepped groove which surrounds the outside of the cylinder, a protrusion inserted into the stepped groove is formed in the valve plate, And an O-ring member interposed between the inner surface of the groove and the outer surface of the protrusion to block leakage of the refrigerant between the cylinder and the valve plate.

Description

RECIPROCATING COMPRESSOR

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating compressor, and more particularly, to a reciprocating compressor capable of preventing leakage of high temperature and high pressure gas in a cylinder.

Generally, compressors are applied to vapor compression refrigeration cycles such as refrigerators and air conditioners.

Most of the compressors include a switching unit for generating power in the hermetically sealed container and a compression unit for receiving power from the switching unit.

Such compressors are divided into reciprocating compressors, rotary compressors, vane compressors, scroll compressors, and the like according to the method of compressing the refrigerant.

In the reciprocating compressor, the connecting rod is coupled to the crankshaft of the driving portion, the piston is coupled to the connecting rod, and the rotational force of the driving portion is converted to the linear motion of the piston.

The piston, which performs linear motion by the rotation of the crankshaft, is configured to reciprocate in a straight line along the compression space inside the cylinder and compress the compressed refrigerant.

On the other hand, a gasket is used between the cylinder block and the valve plate so that the high-temperature and high-pressure gas can escape from the compressor through the discharge hole without leaking from the compression space of the cylinder.

However, in order to prevent leakage of gas by using the gasket in this manner, the gasket must be compressed with sufficient force. For this purpose, bolts are fastened between the cylinder block and the valve plate.

However, when a strong fastening force is given between the cylinder block and the valve plate by using a mechanical means such as a bolt, there is a fear that the cylinder may be deformed.

For example, when a strong fastening force is applied through a bolt to sufficiently compress a gasket, the cylinder may be deformed into an elliptical shape or the like.

The cylinder deformed in this manner may increase the friction loss with the piston, and the compression efficiency of the compressor may be lowered due to an increase in leakage between the cylinder and the piston.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a reciprocating compressor having a structure capable of sealing leakage of a high-temperature, high-pressure gas in a cylinder to a gasket and a suction valve.

It is another object of the present invention to provide a reciprocating compressor capable of preventing deformation of a cylinder due to gasket fastening and reducing frictional loss between the cylinder and the piston and preventing a reduction in compression efficiency in advance.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description and more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

The reciprocating compressor according to an embodiment of the present invention includes a cylinder block having a cylinder for compressing a refrigerant by reciprocating motion of a piston and a valve plate coupled to the cylinder block so as to communicate with the cylinder, Wherein the cylinder block is formed with a circular stepped groove which surrounds the outside of the cylinder, and the valve plate is provided with a protrusion inserted into the stepped groove, and is interposed between an inner surface of the stepped groove and an outer surface of the protrusion, And an O-ring member for blocking leakage of the refrigerant between the cylinder and the valve plate.

Preferably, the apparatus further includes a top clearance adjustment sheet interposed between the step groove and the projection to adjust a top clearance between the cylinder block and the valve plate.

The O-ring member may be pressed in a direction crossing the direction of engagement between the cylinder block and the valve plate, thereby sealing the refrigerant leakage regardless of the tightening force between the cylinder block and the valve plate.

Further, the O-ring member may be fixed to the outer surface of the protrusion. For example, a phenomenon may occur in which the o-ring member is pushed from a predetermined position when assembling between the cylinder and the valve plate, and a stopper or a milling preventing structure may be added to prevent this.

The O-ring member may be coupled to the outer surface of the protrusion such that the O-ring member is biased toward the tip of the outer surface of the protrusion.

A groove may be formed on an outer surface of the protrusion, and the O-ring member may be fixedly positioned by inserting a lower end thereof through the groove.

According to the present invention, it is possible to prevent the high-temperature, high-pressure gas in the cylinder from leaking to the gasket and the suction valve without pressing the gasket with a strong clamping force.

Further, according to the present invention, it is possible to prevent deformation of the cylinder, which may be caused by tightening the bolt with a strong clamping force, in order to press the gasket with sufficient force.

Further, according to the present invention, it is possible to prevent leakage of high-temperature and high-pressure gas without deformation of the cylinder, to prevent an increase in frictional loss between the cylinder and the piston, and to prevent an increase in leakage between the cylinder and the piston.

As a result, according to the present invention, deterioration of the compression efficiency of the reciprocating compressor can be prevented in advance.

The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

1 is a cross-sectional view schematically showing a configuration of a reciprocating compressor according to an embodiment of the present invention.
2 is a view schematically showing a cylinder configuration of a reciprocating compressor.
3 is an exploded view of a valve plate, a suction valve, and a gasket which are fastened to a cylinder of a reciprocating compressor.
4 is an exploded perspective view schematically showing a cylinder sealing structure of a reciprocating compressor according to an embodiment of the present invention.
5 is a view schematically showing a side surface shape of a cylinder of a reciprocating compressor according to an embodiment of the present invention.
6 is an exploded view of the sealing structure shown in Fig.
7 is a partial cross-sectional view illustrating a cylinder sealing structure of a reciprocating compressor according to an embodiment of the present invention.
8 is a partial cross-sectional view illustrating a cylinder sealing structure of a reciprocating compressor according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings so that those skilled in the art can easily carry out the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification. Further, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, when an element is described as being "connected", "coupled" or "connected" to another component, the component may be directly connected to or connected to the other component But it should be understood that other components may be "interspersed " between each component, or that each component may be" connected ", "coupled ", or" connected "through other components.

In this specification, the compressor refers to a vapor compression refrigeration cycle such as a refrigerator or an air conditioner.

FIG. 1 is a cross-sectional view briefly showing a configuration of a reciprocating compressor according to an embodiment of the present invention, and FIGS. 2 and 3 are views showing a general cylinder sealing structure.

Referring to FIG. 1, a reciprocating compressor 1 includes a transmission portion 100 and a compression portion 200.

The electromotive unit 110 is installed inside the hermetically sealed container 10 and is configured to perform forward and reverse rotation. The compression unit 200 is installed on the upper portion of the transmission unit 100 and compresses the refrigerant by receiving the rotational force of the transmission unit 100.

For example, the driving unit 100 may use a constant speed motor or an inverter motor capable of forward rotation and reverse rotation.

The transmission portion 100 may include a stator 110, a rotor 120, and a crankshaft 130. The stator 110 can be supported by the frame 20 inside the sealed container 10. The rotor 120 may be rotatably installed inside the stator 110.

The crankshaft 130 is configured to transmit the rotational force of the rotor 120 to the compression unit 200. To this end, the pin 131 of the crankshaft 130 is engaged with one end of the connecting rod 230.

The oil passage 133 may be formed in the axial direction of the crank shaft 130, but is not limited thereto.

The compression section 200 includes a valve plate 250 having a cylinder 211, a piston 220, a connecting rod 230, and a valve or the like. The connecting rod 230 linearly reciprocates the piston 220 in the cylinder 211 using the rotational force of the crankshaft 130.

The cylinder 211 provides a space for compressing the refrigerant by the linear reciprocating motion of the piston 220. A valve plate 250 incorporating a valve for controlling the suction and discharge of the refrigerant is disposed on the discharge side of the cylinder 211, .

 Specifically, the valve plate 250 is fastened and fixed through one surface of the cylinder block 210 (see FIG. 2).

FIG. 2 is a view schematically showing a cylinder configuration of a conventional reciprocating compressor, and FIG. 3 is an exploded view of a valve plate, a suction valve, and a gasket.

Referring to FIGS. 2 and 3, a valve plate 250 is coupled to the cylinder block 210. The cylinder block 210 has a cylinder for compressing the refrigerant by the reciprocating motion of the piston 220 (see FIG. 1).

The valve plate 250 is coupled to the cylinder block 210 so as to communicate with the cylinder 211.

A gasket 265 and a suction valve 260 are inserted between the cylinder block 210 and the valve plate 250.

The gasket 265 is provided between the cylinder block 210 and the valve plate 250 so as to allow gas (i.e., refrigerant) of high temperature and high pressure to escape from the compression space of the cylinder 211 through the discharge hole, .

Meanwhile, the cylinder block 210 and the valve plate 250 are coupled by bolts fastened through the fastening holes 250c.

At this time, if the gasket 265 is used to pressurize the gasket 265 with a sufficient tightening force to prevent leakage of the high-temperature high-pressure gas. However, there is a fear that deformation may occur in the cylinder 211 due to strong fastening force. The present invention has been devised to prevent such a problem, and provides a structure capable of preventing leakage of refrigerant regardless of a fastening force.

FIG. 4 is an exploded perspective view showing a cylinder block and a valve plate of a reciprocating compressor according to an embodiment of the present invention, and FIG. 5 is a side view of a cylinder of a reciprocating compressor. And Fig. 6 is an exploded view of the valve plate, the o-ring member, the suction valve, and the top clearance adjustment sheet.

As shown, the reciprocating compressor according to one embodiment of the present invention includes a cylinder block 210, a valve plate 250, an O-ring member 280, and a top clearance adjustment sheet 270.

The cylinder block 210 has a cylinder 211 for compressing the refrigerant by reciprocating movement of the piston 220. The valve plate 250 is connected to the cylinder block 210 so as to communicate with the cylinder 211 Facing each other.

At this time, a circular stepped groove 210b surrounding the cylinder 211 is formed in the cylinder block 210.

That is, the cylinder block 210 has a coupling surface 210a to be engaged with the valve plate 250. The stepped groove 210b is recessed at a predetermined height relative to the coupling surface 210a, As shown in Fig.

The coupling surface 210a of the cylinder block 210 has a rectangular shape and at least one fastening hole 210c is provided for each corner so that a bolt .

The valve plate 250 is formed with a protrusion 250b (see FIG. 6) inserted through the stepped groove 210b of the cylinder block 210. Therefore, the projection 250b (see FIG. 6) may have a size and shape that can be inserted into the stepped groove 210b.

The valve plate 250 has a flat surface 250a (see FIG. 6) that faces the engaging surface 210a of the cylinder block 210. The protrusion 250b (see FIG. 6) has a flat surface 250a (See FIG. 4A).

The flat surface 250a of the valve plate 250 may have a shape and a size corresponding to the engagement surface 210a of the cylinder block 210 and may have a rectangular shape, for example.

At least one fastening hole 250c is provided for each corner of the flat surface 250a of the valve plate 250 so that the fastening hole 250c of the valve plate 250 and the fastening hole 210c of the cylinder block 210 The bolts can be fastened in succession.

The O-ring member 280 is interposed between the inner surface of the stepped groove 210b and the outer surface of the protrusion 250b.

The O-ring member 280 serves to prevent refrigerant leakage between the cylinder 211 and the valve plate 250. More specifically, the O-ring member 280 includes a cylinder 211, a suction valve 260, a suction valve 260, Thereby preventing refrigerant leakage between the plates 250.

More specifically, the O-ring member 280 is compressed in the direction (that is, the Z-axis direction) intersecting the cylinder block 210 and the valve plate 250 in the fastening direction (The direction of pressing is indicated by an arrow). Since the O-ring member 280 is pressed in this direction, the leakage of the refrigerant can be sufficiently sealed regardless of the tightening force between the cylinder block 210 and the valve plate 250.

In other words, even if the cylinder block 210 and the valve plate 250 are fastened with a relatively weak fastening force, the high temperature and high pressure refrigerant can be sufficiently sealed.

The top clearance adjustment seat 270 is inserted between the stepped groove 210b of the cylinder block 210 and the protruding portion 250b of the valve plate 250.

More specifically, the protrusion 250b of the valve plate 250 is provided with a suction valve 260. The top clearance adjustment seat 270 is disposed between the suction valve 260 and the stepped groove 210b, TC, see Fig. 7).

That is, the top clearance adjustment sheet 270 serves to prevent the top clearance TC (see FIG. 7) from fluctuating.

In general, the efficiency of a compressor that excludes a drive can be expressed as a product of motor efficiency, mechanical efficiency, and compression efficiency. The compression efficiency is expressed by six losses by heat transfer, leakage and valve opening.

The top clearance (TC, see FIG. 7) refers to the clearance with the suction valve when the piston is at top dead center.

Since this top clearance (TC, see FIG. 7) relates to the compression efficiency of the compressor, there is a need to manage it at an appropriate level.

Therefore, a certain top clearance TC (see Fig. 7) can be easily adjusted and managed through the top clearance adjustment sheet 270. [

7 and 8 are partial cross-sectional views illustrating a cylinder sealing structure of a reciprocating compressor according to an embodiment of the present invention.

7, the O-ring member 280 is interposed between the inner surface of the stepped groove 210b and the outer surface of the protrusion 250b, and is connected to the cylinder 211, the suction valve 260, and the suction valve 260, And the valve plate (250).

The O-ring member 280 is compressed in the direction (i.e., the Z-axis direction) crossing the cylinder block 210 and the valve plate 250 in the fastening direction (i.e., the Y-axis direction). According to this structure, the leakage of the refrigerant can be prevented through the O-ring member 280 regardless of the tightening force between the cylinder block 210 and the valve plate 250.

The top clearance adjustment sheet 270 is formed to have a constant thickness and is disposed between the suction valve 260 and the stepped groove 210b to prevent the top clearance TC from fluctuating to maintain the top clearance TC constant have.

On the other hand, the o-ring member 280 can be coupled to the outer surface of the protrusion 250b of the valve plate 250 as shown in Fig. Preferably, the O-ring member 280 may be coupled to the front side of the outer surface of the protrusion 250b so that the O-ring member 280 is biased toward the front side.

In addition, when the internal pressure of the cylinder 211 or the assembly between the cylinder block 210 and the valve plate 250, the O-ring member 280 is moved from the initial position to move backward, A further stopper or anti-milling structure can be constructed.

8, in order to prevent the O-ring member 280 from being pushed and moved during the internal pressure of the cylinder 211 or during assembly between the cylinder block 210 and the valve plate 250, the outer surface of the protrusion 250b Grooves 250d may be further formed in the grooves 250d.

The lower end of the O-ring member 280 may be inserted through a groove 250d provided on the outer surface of the protrusion 250b to be fixed in position. Thus, it is possible to prevent the position of the O-ring member 280 from fluctuating, and it is advantageous in selecting the initial position.

As described above, according to the structure and the function of the present invention, it is possible to prevent the high temperature and high pressure gas in the cylinder from leaking to the gasket and the suction valve without pressing the gasket with a strong clamping force.

Furthermore, by using the O-ring member, it is possible to obtain a satisfactory leakage effect even with a small clamping force, and it is possible to prevent deformation of the cylinder, which may occur as a result of pressing the gasket with a strong clamping force.

That is, by using an O-ring member made of an elastic material, it is possible to prevent leakage between the cylinder, the suction valve, the suction valve and the valve plate, thereby achieving a sufficient sealing effect. A structure in which the o-ring surrounds the valve plate for top clearance of the piston.

Furthermore, it is possible to prevent leakage of the high-temperature high-pressure gas without deformation of the cylinder, to prevent an increase in frictional loss between the cylinder and the piston, and to prevent an increase in leakage between the cylinder and the piston. As a result, there is an advantageous technical effect that the compression efficiency of the reciprocating compressor can be prevented from lowering in advance.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the invention is not limited to the disclosed exemplary embodiments. It is obvious that a transformation can be made. Although the embodiments of the present invention have been described in detail above, the effects of the present invention are not explicitly described and described, but it is needless to say that the effects that can be predicted by the configurations should also be recognized.

1: compressor (or reciprocating compressor)
10: Closed container
20: frame
100:
110: stator
120: rotor
130: Crankshaft
131:
133: Oil channel
200:
210: cylinder block
210a: valve coupling surface
210b: stepped groove
210c: fastening hole
211: Cylinder
220: Piston
230: Connecting rod
250: Valve plate
250a: cylinder coupling surface
250b:
250c: fastening hole
250d: Groove
260: Suction valve
265: Gasket
270: Top clearance adjustment sheet
280: O-ring member
TC: Top clearance

Claims (6)

A cylinder block having a cylinder for compressing the refrigerant by reciprocating motion of the piston; And
And a valve plate facing the cylinder block to communicate with the cylinder,
Wherein the cylinder block is formed with a circular stepped groove which surrounds the outside of the cylinder, a protrusion inserted into the stepped groove is formed in the valve plate,
And an O-ring member interposed between an inner surface of the stepped groove and an outer surface of the protrusion to block leakage of the refrigerant between the cylinder and the valve plate.
The method according to claim 1,
A top clearance adjustment sheet inserted between the stepped groove and the projection to adjust a top clearance between the cylinder block and the valve plate;
Further comprising:
3. The method according to claim 1 or 2,
The O-
The cylinder block and the valve plate are pressed in a direction crossing the direction of engagement between the cylinder block and the valve plate to seal the refrigerant leakage regardless of the tightening force between the cylinder block and the valve plate
Reciprocating compressor.
3. The method according to claim 1 or 2,
The O-
And is fixedly positioned on the outer surface of the protrusion
Reciprocating compressor.
5. The method of claim 4,
The O-
And is fixed so as to be positionally biased toward the distal end of the outer surface of the protrusion
Reciprocating compressor.
5. The method of claim 4,
A groove is formed on an outer surface of the protrusion,
The O-
And a lower end is inserted through the groove to be fixed in position
Reciprocating compressor.

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