KR20150082767A - Compressor having check valve - Google Patents

Abstract

The present invention relates to a compressor having a check valve for allowing a refrigerant to pass only when the pressure of a refrigerant flowing into a discharge chamber of a compressor is equal to or more than a predetermined value. The oil separating function is applied to the check valve, A compressor having a check valve is provided.

Description

[0001] COMPRESSOR HAVING CHECK VALVE [0002]

The present invention relates to a compressor having a check valve, and more particularly to a compressor having a check valve provided with a function of separating oil from refrigerant sucked from a discharge chamber.

Generally, a compressor used in an air conditioning system of an automobile performs a function of sucking a vaporized refrigerant from an evaporator and converting it into a high-temperature and high-pressure state, which is easy to be liquefied, and transferring it to a condenser.

1 is a side cross-sectional view of a compressor having a general shape, and shows a swash plate type compressor in which a piston is reciprocated in accordance with rotation of a swash plate to compress a refrigerant.

Referring to Fig. 1, a swash plate compressor includes a cylinder block 10, a front housing 20, and a rear housing 30.

The cylinder block 10 forms a center side body of the compressor and a center bore 12 is formed at a center portion of the rear side space and a plurality of cylinder bores 11 are formed at a radial position around the center bore 12, . A piston 42 is accommodated in each cylinder bore 11 to compress the refrigerant supplied into the cylinder bore 11 by reciprocating movement.

The front housing 20 is coupled to the front of the cylinder block 10 to form the front body of the compressor. A crank chamber 21 is formed in the front housing 20 and a drive shaft 41, a rotor 43 and a swash plate 44 are installed in the crank chamber 21.

The drive shaft 41 is installed through the front housing 20 and the center bore 12 of the cylinder block 10 and is rotationally driven by the driving force transmitted from the engine.

The rotor 43 is coupled to the drive shaft 41 in the crank chamber 21 and rotates together with the drive shaft 41.

The swash plate 44 is hinged to the rotor 43 so that the inclination angle can be varied and is connected to each piston 42 through a plurality of shoes 45. The shoe 45 connects the swash plate 44 and each piston 42 at a plurality of points of the swash plate 44 and the swash plate 44 is rotatably connected to the shoe 45.

Due to such a constitution, each piston 42 reciprocates in the cylinder bore 11 according to the rotation of the swash plate 46 to compress the refrigerant in the cylinder bore 11.

The rear housing 30 is joined to the rear of the cylinder block 10 to form a rear-side body of the compressor. The rear housing 30 is formed with a suction chamber 31 through which the external refrigerant flows through the suction port 35 and a discharge chamber 33 through which the compressed refrigerant in the cylinder bore 11 is discharged. The suction chamber 31 is formed at a central portion of the rear housing 30 and the discharge chamber 33 is formed along the edge of the rear housing 33.

A valve assembly 50 is provided between the cylinder block 10 and the rear housing 30 for interrupting the flow of the refrigerant between the cylinder bore 11 and the suction chamber 31 and the discharge chamber 33. The valve assembly 50 controls the flow of the refrigerant based on the pressure difference between the cylinder bore 11 and the suction chamber 31 and the pressure difference between the cylinder bore 11 and the discharge chamber 33.

A muffler (60) is provided on one side of the outer surface of the cylinder block (10). A muffler chamber 61 for reducing the pulsation and noise of the refrigerant delivered from the discharge chamber 33 is formed in the muffler 60. The muffler chamber 61 communicates with the communication passage 65 of the rear housing 30 And communicates with the discharge chamber (33). A discharge port 66 for discharging the compressed refrigerant to the outside is formed outside the muffler chamber 61. 1 illustrates a structure in which the cylinder block 10 and the muffler 60 are integrally formed. However, a structure in which the muffler 60 is not applied and the discharge port is formed in the rear housing 30 is also possible.

On the other hand, the discharge chamber 33 is provided with a check valve 70 for allowing the refrigerant to pass only when the pressure of the refrigerant discharged from the cylinder bore 11 is equal to or higher than a certain pressure. The check valve 70 functions to shut off the passage of the refrigerant when the pressure of the refrigerant transferred to the discharge chamber 33 is smaller than a predetermined value. When the compressor stops operating, the check valve 70 adjusts the angle of the swash plate 44, (42) is minimized. The compressed refrigerant discharged to the discharge chamber 33 passes through the check valve 20, passes through the muffler chamber 61, and is discharged to the discharge port 66.

On the other hand, in order to smoothly drive the compressor as described above, the refrigerant contains oil. The oil contained in the refrigerant lubricates the surfaces where mechanical friction occurs, such as between the swash plate 44 and the shoe 45, between the piston 42 and the cylinder bore 11, and the like. However, when the oil contained in the refrigerant flows into the heat exchanger, the refrigerant fluidity is lowered and the efficiency of the heat exchange is lowered, thereby reducing the efficiency of the air conditioning system.

In order to solve such a problem, an oil separator is installed in the compressor. The oil separator separates the oil from the refrigerant discharged from the compressor and returns the oil to the inside of the compressor. Such an oil separator is typically installed in the rear housing 30. The oil separator is complicated in assembly due to the complicated construction of the oil separator, and further processing is required to be performed on the rear housing 30 in order to secure a space for installing the oil separator. Further, there arises a problem that the size of the compressor is increased by the installation space to be ensured in the rear housing 30.

On the other hand, the construction of the compressor and the check valve applied thereto is a well-known technology, and in particular, is described in detail in the following prior art documents, so that redundant description and illustration are omitted.

Japanese Patent Application Laid-Open No. 10-2011-0134167 (December 14, 2011)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a check valve for a compressor that eliminates the need for a separate oil separator by applying an oil separation function to a check valve.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

A cylinder block 10 having a cylinder bore 11 for receiving a piston 42 and a crank chamber 21 joined to the front of the cylinder bore 11 to form a crank chamber 21, A rear housing 30 coupled to the rear of the cylinder block 10 and including a suction chamber 31 and a discharge chamber 33; The check valve 100 is provided with a discharge hole 111 for discharging the refrigerant sucked from the discharge chamber 33, and a check valve 100 for passing the refrigerant only when the pressure of the refrigerant A core 120 which opens and closes the discharge hole 111 by linearly moving within the valve case 110 and a valve case 110 which is provided between the core 120 and the valve case 110, And a valve seat formed on the inner circumferential surface of the valve case, It discloses a compressor comprising a helical guide 140 that rotates the refrigerant so as to centrifuge the oil from the refrigerant discharged to.

According to the compressor of the present invention, the helical guide 140 may have a spiral rib shape protruding from the inner circumferential surface of the valve case 110.

According to the compressor of the present invention, the helical guide 140 can be formed in front of the discharge hole 111.

According to the compressor of the present invention, the helical guides 140 can be formed in plural numbers at regular intervals along the inner circumferential direction of the valve case 110.

According to the present invention, the oil separating function is applied to the check valve, so that it is not necessary to install a separate oil separator, thereby simplifying the assembling process of the compressor and reducing the manufacturing cost.

Further, there is no need to secure a space for installing the oil separator in the rear housing, which is advantageous in reducing the space limitation of the compressor.

1 is a perspective view of a swash plate type compressor in a general form;
2 is a perspective view of a check valve according to one embodiment of the present invention;
3 is a perspective view showing the internal structure of the check valve shown in Fig.
4 is a cross-sectional perspective view of the check valve shown in Fig.

Hereinafter, a compressor having a check valve according to the present invention will be described in detail with reference to the drawings.

2 is a perspective view of a check valve according to an embodiment of the present invention. 3 is a perspective view showing the internal structure of the check valve shown in Fig. And Fig. 4 is a cross-sectional perspective view of the check valve shown in Fig.

The check valve 100 for a compressor according to the present invention is configured to pass a refrigerant only when the pressure of the refrigerant is equal to or higher than a certain pressure, which is provided in the discharge chamber 33 of the compressor. The description of the configuration and operating state of the apparatus will be omitted.

2 through 4, a check valve for a compressor according to the present invention has a configuration including a valve case 110, a core 120, a spring 130, and a helical guide 140.

The valve case 110 is provided on the discharge chamber 33 of the rear housing 30 and sucks and discharges the refrigerant. The valve case 110 is in the form of a cylinder having an open front, and a plurality of discharge holes 111 are formed on the outer circumferential surface of the valve case 110. The refrigerant introduced through the opening of the valve case 110 is discharged through the discharge hole 111.

A valve cap 150, which is formed to have a through-hole 151, is coupled to the front of the valve case 110. The valve cap 150 has an outer diameter larger than the outer diameter of the valve case 110 and the valve cap 150 is press-fitted into the inner surface of the discharge chamber 33 so that the check valve is fixed to the discharge chamber 33.

The core 120 is installed so as to be linearly movable in the valve case 110 and is configured to open and close the discharge hole 111 of the valve case 110 by linear movement. The core 120 may have a cylindrical shape having an outer surface corresponding to the inner circumferential surface of the valve case 110.

The spring 130 is installed between the core 120 and the valve case 110 to elastically support the core 120 and the valve case 110. The spring 130 is installed between the rear surface of the core 120 and the bottom surface of the valve case 110 and applies an elastic force to the core 130 toward the front of the valve case 110.

When no pressure is applied to the core 120, the core 120 maintains a state in which it is blocking the discharge hole 111. The core 120 closing the discharge hole 111 does not move due to the elastic force of the spring 130 when the pressure of the refrigerant introduced from the discharge chamber 33 is smaller than the set pressure, none. When the pressure of the refrigerant is equal to or higher than the set pressure, the core 120 moves to the rear of the valve case 110 and the discharge hole 111 is opened, so that the refrigerant can pass through the discharge hole 111.

The helical guide 140 is formed on the inner circumferential surface of the valve case 110 and serves to rotate the refrigerant flowing through the valve case 110 so as to centrifuge the oil from the refrigerant discharged through the discharge hole 111.

The spiral guide 140 is formed in front of the discharge hole 111 and applies rotational force to the refrigerant flowing toward the discharge hole 111. [ The helical guide 140 has a shape of a spiral rib protruding from the inner circumferential surface of the valve case 110 and can be formed at a plurality of intervals at regular intervals along the inner circumferential direction of the valve case 110.

Hereinafter, an operation state of the check valve for a compressor having the above-described configuration will be described.

As the piston 42 moves in the cylinder bore 11, the compressed refrigerant passes through the valve assembly 50 and is discharged to the discharge chamber 33. The refrigerant discharged into the discharge chamber 33 flows into the valve case 111 through the opening of the valve case 111 and flows into the valve case 111. The refrigerant flowing in the valve case 111 is given a rotational force due to the resistance of the spiral guide 140 do. The refrigerant flows through the valve case 111 while rotating.

When the pressure of the refrigerant is equal to or higher than the set pressure, the core 120 moves backward by the pressure of the refrigerant, and the discharge hole 111 is opened. So that the refrigerant is discharged to the outside of the discharge hole 111.

The discharged refrigerant is subjected to centrifugal force by the helical guide 140. Since the refrigerant and the oil contained therein have a specific gravity difference, the oil is centrifugally separated from the refrigerant by the specific gravity difference between the refrigerant and the oil.

The oil separated from the refrigerant is discharged to the discharge port 66 after passing through the communication path 65 and the muffler chamber 61 and the oil separated from the refrigerant falls to the bottom of the discharge chamber 33. The oil collected in the discharge chamber (33) can be recovered into the crank chamber (21) through a flow path communicated with the crank chamber (21).

The compressor having the above-described check valve is not limited to the configuration and the method of the embodiment described above, but various modifications can be made by those skilled in the art within the scope of the technical idea of the present invention.

10: cylinder block 20: front housing
30: rear housing 31: suction chamber
33: Discharge chamber 70, 100: Check valve
110: valve case 111: discharge hole
120: core 130: spring
140: helical guide 150: valve cap

Claims (4)

A cylinder block 10 having a cylinder bore 11 for receiving a piston 42 and a front housing 20 coupled to a front of the cylinder bore 10 to form a crank chamber 21, A rear housing 30 coupled to the rear of the block 10 and having a suction chamber 31 and a discharge chamber 33 and a discharge port 33 for discharging the refrigerant only when the pressure of the refrigerant, A compressor comprising a check valve (100) for passing therethrough,
The check valve (100)
A valve case (110) having a discharge hole (111) for discharging the refrigerant sucked from the discharge chamber (33);
A core 120 that linearly moves within the valve case 110 to open / close the discharge hole 111;
A spring 130 elastically supporting the core 120 and the valve case 110; And
And a spiral guide (140) formed on an inner circumferential surface of the valve case (110) for rotating the refrigerant so as to centrifugate the oil from the refrigerant discharged to the discharge hole (111). The method according to claim 1,
Wherein the helical guide (140) has a spiral rib shape protruding from an inner circumferential surface of the valve case (110). The method according to claim 1,
And the helical guide (140) is formed in front of the discharge hole (111). The method according to claim 1,
Wherein the plurality of helical guides (140) are formed at regular intervals along the inner circumferential direction of the valve case (110).

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