KR20120027793A - Compressor - Google Patents

Abstract

PURPOSE: A piston for compressor is provided to maximize the lubricating effect of the contact surface of the inner surface of the cylinder bore and piston by forming a connecting groove and a circumferential groove. CONSTITUTION: The piston for compressor comprises the front cylinder block, the rear cylinder block, the front housing, the rear housing. The front cylinder block and rear cylinder block comprise the working fluid compression space. The front of the rear cylinder block and front cylinder block is combined with and the front housing and rear housing. The piston compresses the working fluid is the compression space of the front cylinder block and rear cylinder block. The columnar grooves(97,97') are formed in head units(91,91'). A plurality of through grooves(99,99') is formed in the columnar groove into the axial direction of piston.

Description

Compressor {Compressor}

The present invention relates to a compressor, and more particularly, to a compressor piston for smoothly lubricating a piston reciprocating in contact with a cylinder bore.

In general, an air conditioner for heating and cooling is installed in the vehicle. The air conditioner includes a compressor for compressing a low-temperature low-pressure refrigerant drawn from an evaporator into a high-temperature high-pressure refrigerant as a constitution of a cooling system and sending it to a condenser.

The compressor is driven according to the on / off of the air conditioner switch installed on the front panel of the vehicle. When the compressor is driven, the temperature of the evaporator is lowered, and when the compressor is stopped, the temperature of the evaporator is increased. In such a compressor, a configuration for compressing a working fluid includes a reciprocating type that performs compression while reciprocating and a rotary type that performs compression while rotating.

In the reciprocating type, there is a crank type which transmits the driving force of the driving source using a crank shaft, a swash plate type which transmits to a rotating shaft with a swash plate, and a wobble plate type using a wobble plate, and a rotary type vane rotary type using a rotating rotary shaft and vanes. There is a scroll type that uses a rotating scroll and a fixed scroll. Generally, a swash plate type compressor is used.

The swash plate type compressor is driven by receiving power from the rotational force of an automobile engine, and a general fixed displacement type compressor is provided with an electronic clutch to control the operation of the compressor.

1 shows a sectional view of a swash plate compressor according to the prior art, and FIG. 2 shows a side view of the piston according to the prior art.

As shown in FIG. 1, the swash plate type compressor includes a cylinder block 30 having a plurality of cylinder bores 32 therein, a front housing 10 coupled to the front of the cylinder block 30, and the The rear housing 20 is coupled to the rear of the cylinder block 30.

The cylinder block 30 is formed by combining the front cylinder block 30a and the rear cylinder block 30b which are formed substantially symmetrically with each other. In addition, a plurality of cylinder bores 32 are arranged in a circle along the edge of the front and rear cylinder blocks. The cylinder bore 32 is formed in a cylindrical shape as a space for compressing the working fluid.

Inside the cylinder bore 32 is provided a piston 90 for compressing the working fluid. As shown in FIG. 2, head portions 91 and 91 ′ which are in contact with inner surfaces of the cylinder bore 32 are formed at both front and rear ends of the piston 90, and the head is located at the center of the piston 90. The connection part 93 which connects the parts 91 and 91 'is formed. Oil heads 97 and 97 'for lubrication between the inner surface of the cylinder bore 32 and the heads 91 and 91' are formed in the head portion 91 and 91 'in the circumferential direction.

And the front housing 10 is coupled to the front of the front cylinder block (30a). The rear surface of the front housing 10 is formed concave, and the concave portion is combined with the front housing 10 to form the discharge chamber 12. In addition, the rear housing 20 is coupled to the rear of the rear cylinder block 30b. The front surface of the rear housing 20 is concave, and the discharge chamber 22 is formed at the edge portion thereof. The front and rear cylinder blocks 30a and 30b, the front housing 10, and the rear housing 20 are combined by fastening bolts to form an overall compressor.

The rotating shaft 50 penetrating the front housing 10 and the cylinder block 30 to transmit the rotational force of the engine is rotatably installed. The rotary shaft 50 is installed to pass through the shaft hole 14 formed in the center portion of the front housing 10 and the shaft support holes 28 and 28 'formed in the center portion of the cylinder block 30.

A swash plate 70 having a predetermined inclination angle with respect to the rotating shaft 50 is installed in the middle portion of the rotating shaft 50, and the swash plate 70 is coupled to rotate together with the rotation of the rotating shaft 50. The swash plate 70 is assembled to be located in the swash plate chamber 34 formed inside the central portion where the front and rear cylinder blocks are coupled to each other.

A flow path 56 through which the working fluid flows in the longitudinal direction is formed in the rotation shaft 50. The flow path 56 has an inlet 52 communicating with the working fluid from the swash plate chamber 34 and an outlet for supplying the working fluid introduced from the swash plate chamber 34 to the cylinder bore 32. 54 is formed.

In addition, the front of the compressor is provided with a clutch assembly 88 for receiving a rotational force from the engine. The clutch assembly 88 is a disk 80 coupled to the front end of the rotary shaft 50, the coil 84 to generate an electromagnetic force by turning the power on and off, and the pulley 82 receives power from the power source of the engine It is configured to include. The pulley 82 and the coil 84 are integrally coupled to the front portion of the front housing 10 through a bearing.

 The disk 80 is coupled to the front end of the rotation shaft 50. When the disk 80 is applied power to the coil of the clutch, electromagnetic force is generated to suck the disk 80. Therefore, the rotation shaft 50 is rotated by the pulley 82 connected to the rotation shaft 50 of the engine, and thus the compressor operates.

However, according to the swash plate compressor according to the related art, the inner surface of the cylinder bore 32 is lubricated by oil contained in oil grooves 97 and 97 'formed at both front and rear ends of the piston 90. However, the oil grooves 97 and 97 'are formed in the circumferential direction perpendicular to the moving direction of the piston 90, so that the oil grooves 97 and 97' are contained in the oil grooves 97 and 97 'during the reciprocating motion of the piston 90. Only a portion of the oil is sprayed to the outer wall of the cylinder bore 32, and the remainder remains in the oil groove (97,97 '). That is, not all of the oil contained in the oil grooves 97 and 97 'is used for lubrication, and only a part of the oil is lubricated, so that the lubrication is not efficient.

The present invention is to solve the above problems, it is an object to maximize the lubrication effect using the oil contained in the oil groove of the piston.

The swash plate compressor of the present invention for achieving the above object, the front and rear cylinder block having a compression space of the working fluid therein, and the front housing coupled to the front and rear of the front and rear cylinder block to form a discharge chamber And a rear housing and a piston for compressing a working fluid in a compression space of the front and rear cylinder blocks, wherein the front and rear head portions of the piston reciprocating in contact with the compression space have a circumferential groove formed in a circumferential direction; Technical features that a plurality of communication grooves are formed concave outwardly from the circumferential groove in the axial direction of the piston.

The volume formed by the circumferential groove, the communication groove and the inner wall of the compression space is preferably larger than the volume of oil introduced into the circumferential groove and the communication groove by the suction process of the piston.

According to the swash plate compressor according to the present invention, the inner surface of the cylinder bore by forming a longitudinal communication groove communicating with the circumferential groove formed in the circumferential direction at both front and rear ends of the piston reciprocating in contact with the inner surface of the cylinder bore. There is an effect to maximize the lubrication effect of the contact surface of the piston.

1 is a cross-sectional view showing the configuration of a compressor according to the prior art,
Figure 2 is a side view showing a state of a piston according to the prior art,
Figure 3 is a side view showing the appearance of a piston according to the present invention,
Figure 4 is a partial perspective view showing the appearance of the piston according to the present invention.

Next, a preferred embodiment of a rotating shaft for a compressor according to the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the basic structure of the swash plate compressor is substantially the same as the conventional one shown in FIG. 1, and will be described with reference to FIG. 3 is a side view showing the state of a piston for a compressor according to the present invention, and will be described with reference to the same reference numerals as shown in FIG.

As shown in FIG. 1, the compressor according to the present invention includes a cylinder block 30 having a plurality of cylinder bores 32 therein, and a front housing 10 coupled to the front of the cylinder block 30. And it is configured to include a rear housing 20 is coupled to the rear of the cylinder block (30).

The cylinder block 30 is formed by combining the front cylinder block 30a and the rear cylinder block 30b which are formed substantially symmetrically with each other. In addition, a plurality of cylinder bores 32 are arranged in a circle along the edge of the front and rear cylinder blocks. The cylinder bore 32 is formed in a cylindrical shape as a space for compressing the working fluid.

Inside the cylinder bore 32 is provided a piston 90 for compressing the working fluid. As shown in FIG. 3, the piston 90 is formed in a substantially cylindrical shape in a shape corresponding to the cylinder bore 32. Both ends of the piston 90 are formed with heads 91 and 91 ′ which reciprocate in contact with the inner surface of the cylinder bore 32. The heads 91 and 91 'compress the working fluid in the cylinder bore 32. For reference, when the working fluid is compressed in the cylinder bore 32 where one end of the piston 90 is located, the suction process is performed in the cylinder bore where the other end is located.

The piston 90 is formed with a connecting portion 93 connecting the head portions 91 and 91 'to each other. In the middle of the connecting portion 93, a shoe seating portion (not shown) is formed so that the shoe 74 can be inserted. As the shoe 74 is coupled to both sides of the shoe seating portion, the piston 90 linearly reciprocates as the swash plate 70 rotates.

At the front and rear ends of the piston 90, compression surfaces 95 and 95 'are formed to compress the working fluid. The compression surfaces 95, 95 ′ are formed in a plane perpendicular to the reciprocating direction of movement of the piston 90.

The head portions 91 and 91 'are formed with concave circumferential grooves 97 and 97' in the circumferential direction. In addition, a plurality of communication grooves 99 and 99 'is formed concavely in the circumferential grooves 97 and 97' outwardly in the axial direction of the piston 90. That is, the communication groove 99 formed in the front head portion 91 is formed toward the front compression surface 95 (left side in the drawing), and the communication groove 99 'formed in the rear head portion 91' is rearward. It is formed toward the compression surface 95 '(rightward in the drawing).

In the exemplary embodiment of the present invention, the communication grooves 99 and 99 'are formed in the longitudinal direction of the reciprocating motion of the piston 90, but are not necessarily limited thereto, and the communication grooves 99 and 99' communicate with the circumferential grooves 97 and 97 '. Other configurations may be possible in which the oil contained in the grooves 99, 99 'may move smoothly to the inner wall of the cylinder bore.

By forming the communication grooves 99 and 99 ', all oil contained in the circumferential grooves 97 and 97' and the communication grooves 99 and 99 'forms an oil film on the inner surface of the cylinder bore 32. It prevents abrasion between the head 91 and the inner surface of the cylinder bore 32 and effectively lubricates it.

Of course, not only oil but also a refrigerant may be seated in the circumferential groove 97 and the communication groove 99. Similarly, an oil film may be formed on the inner surface of the cylinder bore 32 by the coolant seated in the circumferential groove 97 and the communication groove 99.

The volume formed by the inner wall of the circumferential groove 97, the communication groove 99, and the cylinder bore 32 (hereinafter referred to as an “oil groove volume”) is defined by the suction process of the piston 90. It is preferable that the volume of the entire oil flowing into the circumferential groove 97 and the communication groove 99 (hereinafter referred to as 'oil volume') is greater. If the oil volume is larger than the oil groove volume, the remaining oil flowing into the circumferential groove 97 and the communication groove 99 during the oil inflow process may be communicated to the opposite head portion 99 'and the cylinder bore. Can cause a problem that the efficiency of the compressor is lowered.

And the front housing 10 is coupled to the front of the front cylinder block (30a). The rear surface of the front housing 10 is formed concave, and the concave portion is combined with the front housing 10 to form the discharge chamber 12. In addition, the rear housing 20 is coupled to the rear of the rear cylinder block 30b. The front surface of the rear housing 20 is concave, and the discharge chamber 22 is formed at the edge portion thereof. The front and rear cylinder blocks 30a and 30b, the front housing 10, and the rear housing 20 are combined by fastening bolts to form an overall compressor.

The rotating shaft 50 penetrating the front housing 10 and the cylinder block 30 to transmit the rotational force of the engine is rotatably installed. The rotary shaft 50 is installed to pass through the shaft hole 14 formed in the center portion of the front housing 10 and the shaft support holes 28 and 28 'formed in the center portion of the cylinder block 30.

A swash plate 70 having a predetermined inclination angle with respect to the rotating shaft 50 is installed in the middle portion of the rotating shaft 50, and the swash plate 70 is coupled to rotate together with the rotation of the rotating shaft 50. The swash plate 70 is assembled to be located in the swash plate chamber 34 formed inside the central portion where the front and rear cylinder blocks are coupled to each other.

A flow path 56 through which the working fluid flows in the longitudinal direction is formed in the rotation shaft 50. The flow path 56 has an inlet 52 communicating with the working fluid from the swash plate chamber 34 and an outlet for supplying the working fluid introduced from the swash plate chamber 34 to the cylinder bore 32. 54 is formed.

In addition, the front of the compressor is provided with a clutch assembly 88 for receiving a rotational force from the engine. The clutch assembly 88 is a disk 80 coupled to the front end of the rotary shaft 50, the coil 84 to generate an electromagnetic force by turning the power on and off, and the pulley 82 receives power from the power source of the engine It is configured to include. The pulley 82 and the coil 84 are integrally coupled to the front portion of the front housing 10 through a bearing.

Hereinafter, a process in which the working fluid is compressed by the swash plate compressor according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 and 3.

When power is transmitted from the engine through the clutch assembly 88, the rotary shaft 50 is rotated, the swash plate 70 coupled to the rotary shaft 50 is rotated. Rotation of the swash plate 70 is transmitted to the piston 90 through the shoe 74 is converted into a linear reciprocating motion of the piston (90). As the piston 90 linearly reciprocates, the working fluid in the cylinder bore 32 is compressed.

Next, the process of moving the working fluid in accordance with the operation of the compressor will be described in detail.

The working fluid introduced into the swash plate chamber 34 moves to the flow path 56 of the rotation shaft 50 through the inlet 72 formed in the swash plate 70. The working fluid moving along the flow path 56 of the rotating shaft 60 passes through the outlet 54 of the rotating shaft 50 and moves to the cylinder bore 32 through an outlet 36 formed in the cylinder bore 32. do.

The working fluid moved to the cylinder bore 32 is subjected to a compression process due to the reciprocating motion of the piston 90, and the compressed working fluid is delivered to the discharge chamber 22 and to the outside of the compressor.

Meanwhile, a process in which an oil film is formed on the inner surface of the cylinder bore 32 by the reciprocating motion of the piston 90 will be described in detail. Figure 4 is a perspective view partially showing the appearance of the piston according to the present invention.

As shown in FIG. 4, when the piston 90 compresses the working fluid (when the piston moves to the top dead center), the oil contained in the circumferential groove 97 and the communication groove 99 is cylinder bore. Due to the pressure of 32, it is sprayed onto the inner surface of the cylinder bore 32 to form an oil film. That is, the oil is sprayed to the inner surface of the cylinder bore 32 while the oil moves in the direction indicated by the solid line in the drawing. Therefore, the piston 90 reciprocates, and the inner surface of the cylinder bore 32 and the head 91 of the piston 90 come into contact with each other to reduce wear caused by friction generated during reciprocating motion. It suppresses heat generation and increases the efficiency of the compressor.

When the piston 90 sucks the working fluid (when the piston moves to the bottom dead center), a part of the oil sucked into the cylinder bore 32 is the circumferential groove 97 and the communication groove 99. It is put in. That is, while the oil moves in the direction of the arrow indicated by the dotted line in the drawing is put into the circumferential groove (97) and the communication groove (99).

At this time, the oil groove volume formed by the inner wall of the circumferential groove 97, the communication groove 99 and the cylinder bore 32, the circumferential groove 97 and the communication groove 99 in the suction process of the piston Since it is larger than the oil volume flowing into the oil, the oil does not communicate with the cylinder bore on the opposite side of the suction process, thereby maximizing the efficiency of the compressor.

 In addition, since the oil sprayed on the inner surface of the cylinder bore 32 during the compression process is recycled together with the suction refrigerant, it can be seen that there is little loss of oil as a whole.

Of course, not only oil but also a refrigerant may be seated in the circumferential groove 97 and the communication groove 99. Similarly, an oil film may be formed on the outer surface of the piston 90 by the refrigerant seated in the circumferential groove 97 and the communication groove 99.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and it is understood that those skilled in the art can make various modifications and adaptations within the scope of the claims. Self-explanatory

10: front housing 12: discharge room
14: Axis 20: Rear housing
22: discharge room 24: discharge outlet
26: discharge plate 28: shaft support ball
30: cylinder block 30a: front cylinder block
30b: rear cylinder block 32: cylinder bore
34: Judge Room 36: Outlet
50: rotation shaft 52: entrance
54: Exit 56: Euro
70: swash plate 72: inlet
80: disk 82: pulley
84: coil 88: clutch assembly
90: piston 91: head
93: connection 95: compression surface
97: circumferential groove 99: communication groove

Claims (2)

Front and rear cylinder blocks (30a, 30b) having a compression space of the working fluid therein,
A front housing 10 and a rear housing 20 coupled to the front and rear of the front and rear cylinder blocks 30a and 30b to form discharge chambers 12 and 22, and
In the compressor comprising a piston (90) for compressing the working fluid in the compression space of the front and rear cylinder blocks (30a, 30b);
Circumferential grooves 97 and 97 'formed in the circumferential direction in front and rear head portions 91 and 91' of the piston 90 which are in contact with the compression space and reciprocate;
And a plurality of communication grooves (99,99 ') are formed in the circumferential groove (97,97') outwardly of the piston (90). The method of claim 1,
The volume formed by the circumferential grooves 97 and 97 ', the communication grooves 99 and 99' and the inner wall of the compression space is formed by the suction process of the piston 90. Compressor, characterized in that formed larger than the volume of oil flowing into the communication groove (99).

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