KR101336436B1 - Piston for swash plate type compressor - Google Patents

Abstract

According to the present invention, a plurality of cylinder bores (10) rotatably supporting a drive shaft (9) and a piston (100) formed of a head (115), a bridge (111), and a shoe pocket boss (113) are capable of reciprocating. ) Swash plate through the front and rear cylinder blocks (2, 3), the swash plate 12 that rotates by the rotation of the drive shaft (9), the shoe 11 is fastened to the shoe pocket boss 113 of the piston 100 In the swash plate type compressor (1) for slidably sandwiching the outer circumferential portion of (12) and rotating the swash plate (12) by the rotation of the drive shaft (9) to reciprocate the piston (100) in the cylinder bore (10). In the bridge 100 and the shoe pocket boss 113 of the piston 100, at least one pair of weight reducing grooves 200 are formed at symmetrical positions.

Compressor, piston

Description

Piston for swash plate compressor {PISTON FOR SWASH PLATE TYPE COMPRESSOR}

The present invention relates to a piston, and more particularly, to a piston for a swash plate type compressor reciprocating in conjunction with the rotation of the swash plate in the state installed in the compressor provided in the air conditioner of the vehicle.

In general, the swash plate compressor compresses the refrigerant while the piston reciprocates with respect to the rotation of the swash plate, and the front and rear cylinder blocks are respectively installed in the front and rear housings, and the pistons are axially installed in the front and rear cylinder blocks. Many of these cylinder bores are formed to face each other.

And, between the front and rear cylinder block is provided with a swash plate chamber in which the swash plate coupled with the drive shaft is located.

When the swash plate coupled with the drive shaft rotates, the compressor having this configuration performs a stroke for sucking or compressing the refrigerant while causing the plurality of pistons to reciprocate with a constant phase difference inside the cylinder bore.

Here, the piston is to reciprocate in the cylinder bore by receiving the rotational force of the swash plate through the shoe, the piston and the swash plate is in contact with the shoe sandwiched in the center bar to reduce the frictional resistance generated in the contact portion In addition, weight reduction is required to increase the reciprocating efficiency of the piston.

The piston of the swash plate compressor to increase the lubrication and reduce the weight has been presented by the applicant in the Republic of Korea Utility Model 2000-15076, Republic of Korea Patent Publication No. 2003-89214.

However, Korean Utility Model Model No. 2000-15076, which has been filed previously, forms a vertical hole extending downward from the bottom of the groove and a horizontal hole penetrating to the rear of the shoe pocket at the end of the vertical hole. There is a problem that it is difficult to precisely work during the communication work with the vertical hole due to the lack of easy work.

In addition, Korean Patent Laid-Open Publication No. 2003-89214 has a problem in that a lubrication groove is formed in the bridge rear portion of the piston, so that the weight is reduced and the reciprocating efficiency of the piston is low.

The present invention was created in order to solve the above-described problems, and the swash plate which can easily perform the machining operation for reducing the weight of the piston while increasing the reciprocating efficiency by increasing the weight reduction of the piston provided in the swash plate compressor It is an object to provide a piston for a type compressor.

The present invention for achieving the above object, while rotatably supporting the drive shaft (9) capable of reciprocating the piston (100) formed of the head 115, the bridge 111 and the shoe pocket boss 113. Front and rear cylinder blocks (2, 3) formed with a plurality of cylinder bores (10) to be accommodated easily, the swash plate (12) rotated by the rotation of the drive shaft (9), the shoe pocket boss (113) of the piston (100) The outer peripheral portion of the swash plate 12 is slidably sandwiched through a shoe 11 fastened to the slit, and the swash plate 12 is rotated by the rotation of the drive shaft 9 to rotate the piston 100 to the cylinder bore. In the swash plate compressor (1) for reciprocating within (10), the bridge 111 and the shoe pocket boss 113 of the piston 100 at least a pair of weight reducing grooves ( 200) is formed.

Here, the weight reduction groove 200 formed in the bridge 111 and the weight reduction groove 200 formed in the shoe pocket boss 113 may be formed in a cylindrical shape having the same center.

In addition, the weight reduction groove 200 formed in the bridge 111 is preferably larger in diameter than the weight reduction groove 200 formed in the shoe pocket boss 113.

In addition, the weight reduction groove 200 formed in the bridge 111 and the weight reduction groove 200 formed in the shoe pocket boss 113 preferably communicate with each other.

Piston for swash plate compressor of the present invention is easy to process by forming a weight reduction groove symmetrical to the bridge and the shoe pocket boss perpendicular to the longitudinal direction of the piston, respectively, greatly reducing the weight of the piston to increase the reciprocating efficiency to provide.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

1 is a cross-sectional view of a compressor having a swash plate compressor piston according to an embodiment of the present invention, Figure 2 is a cross-sectional view A-A of FIG.

First, as shown in FIG. 1, the compressor 1 with the swash plate compressor piston of the present embodiment includes a front cylinder block 2 and a rear cylinder block 3, and the upper and lower cylinder blocks. (2, 3) are mutually coupled axially to form a cylinder block assembly.

This cylinder block assembly is accommodated in the front housing 4 and the rear housing 5, and the front and rear valve plates 6, 7 interposed between the cylinder block assembly and the front and rear housings 4, 5. And both ends are closed by the front and rear housings 4 and 5.

Through and grooves are formed in the front and rear housings 4 and 5 and the front and rear cylinder blocks 2 and 3, and are coupled to each other by the through bolts 8.

The combined front and rear cylinder blocks 2 and 3 have a central bore in the center on the shaft, and the drive shaft 9 is coupled to the central bore.

In addition, a thrust bearing is coupled around the drive shaft 9 to facilitate rotation of the drive shaft 9.

The cylinder block assembly is provided with a plurality of cylinder bores 10, for example five front cylinder bores and five rear cylinder bores provided coaxially.

This cylinder bore 10 is arranged radially on the same circumference around the drive shaft 9.

Five cylinders 100 are inserted into each of the opposed cylinder bores 10 and engaged with the swash plate 12 integrally formed with the drive shaft 9 by a hemispherical shoe 11 to swash plate 12. Is reciprocated in the cylinder bore 10 by the rotation of.

The crank chamber 13 is provided at the center of the combined front and rear cylinder blocks 2 and 3, and the swash plate 12 is accommodated in the crank chamber 13.

Here, the swash plate 12 is mounted to the drive shaft (9) to rotate in accordance with the rotation of the drive shaft (9), thereby causing the piston 100 in the cylinder bore 10 to reciprocate.

As each piston 100 in the cylinder bore 10 reciprocates, suction and discharge of the refrigerant gas are performed.

The front discharge chamber 14 and the rear discharge chamber 15 are formed in each of the front housing 4 and the rear housing 5, and the front suction chamber 16 and the rear suction chamber 17 are respectively formed at the outside thereof. do. The front valve plate 6 and the rear valve plate 7 each have a front suction port 18 and a rear suction port 19 to communicate fluid between the suction chambers 16 and 17 and each of the cylinder bores 10. This is done.

The front valve plate 6 and the rear valve plate 7 have a front discharge port 20 and a rear discharge port 21, respectively, to discharge fluid between the discharge chambers 14 and 15 and the respective cylinder bores 10. Communication takes place.

That is, the suction ports 18 and 19 are compressed by the compression stroke of the piston 100 by causing the low pressure refrigerant gas to flow into each cylinder bore 10. In addition, the discharge ports 20 and 21 allow high pressure compressed refrigerant gas to be discharged from the cylinder bore 10 to the discharge chambers 14 and 15 by the compression stroke of the piston 100.

The inlets 18, 19 are respectively provided at the front and rear intake valves 22, 23 having reed valves in contact with the inner surfaces of the front and rear valve plates 6, 7, that is, the surfaces in contact with the cylinder block assembly. Closed by Similarly, the discharge ports 20, 21 have forward and rear discharge valves 24 having reed valves in contact with the outer surfaces of the front and rear valve plates 6, 7, that is, the surfaces contacting the front and rear housings 4, 5. Closed by 25).

The reed valves of the suction and discharge valves 22, 23, 24, and 25 are spaced apart from the corresponding suction ports 18 and 19 and discharge ports 20 and 21 by the reciprocating motion of the piston 100. Each inlet and outlet are opened.

Figure 3 is a perspective view of a piston for a swash plate compressor according to an embodiment of the present invention, Figure 4 is a cross-sectional view B-B of FIG.

Thus, the piston 100 of the present invention, as shown in Figure 3, the bridge bore 111 is formed with a central groove 112 on the back, and the cylinder bore in the state coupled to both ends of the bridge 111, respectively A double headed piston having a head 115 inserted into (10) and slidably reciprocating is used.

In addition, the rear side of the bridge 111 of the piston 100 is provided with a shoe pocket boss 113 is formed with a shoe pocket 114 for receiving the shoe (11).

The bridge 411 and the shoe pocket boss 413 of the piston 100 form at least one pair of weight reducing grooves 200 at positions symmetrical with each other.

Therefore, the oil is stored in the weight reduction groove 200 formed in the piston 100 to smoothly perform lubrication at the time of initial driving, and reduce the weight of the piston 100 to reduce the piston 100. The reciprocating efficiency of is increased.

The weight reduction groove 200 is formed in the bridge 111 and the shoe pocket boss 113 to be perpendicular to the longitudinal direction of the piston 100 so as to facilitate processing during processing using a processing apparatus.

In addition, the weight reduction groove 200 formed in the bridge 111 and the weight reduction groove 200 formed in the shoe pocket boss 113 may be formed in a cylindrical shape having the same center.

Here, the weight reduction groove 200 formed in the bridge 111 is preferably formed to have a larger diameter than the weight reduction groove 200 formed in the shoe pocket boss 113.

That is, the area of the bridge 111 is shorter than that of the shoe pocket boss 113, and the bridge 111 may be larger than the diameter of the weight reducing groove 200 formed in the shoe pocket boss 113. The diameter of the weight reducing groove 200 can be made larger.

Therefore, the effect on the weight reduction of the piston 100 is greater due to the weight reduction groove 200 formed in the bridge 111 than the weight reduction groove 200 formed in the shoe pocket boss 113. Can be.

In addition, in another embodiment of the piston 100, as shown in Figure 5, the weight reducing groove 200 formed in the bridge 111 and the shoe pocket boss 113 of the piston 100 communicate with each other. It can also be formed.

As such, when the weight reducing groove 200 formed in the bridge 111 of the piston 100 and the shoe pocket boss 113 communicates with the oil, the oil passes through the piston 100. The effect that the cooling of (100) becomes easy can be anticipated.

In addition, a predetermined gap is formed between the outer circumferential surfaces of the front and rear cylinder blocks 2 and 3 and the inner circumferential surfaces of the front and rear housings 4 and 5, and the front and rear cylinder blocks 2 and 3 are formed. The outer circumferential wall is provided with a cutout portion (not shown).

Therefore, the refrigerant flowing from the refrigerant inlet 26 is introduced into the crank chamber 13 through the cutout portions of the front and rear cylinder blocks 2 and 3.

The refrigerant introduced into the crank chamber 13 is sucked into the front suction chamber 16 and the rear suction chamber 17 of each of the front and rear housings 4 and 5 through the suction passage. Then, the refrigerant valve is sucked into each cylinder bore 10 by opening the reed valves of the front and rear suction valves 22 and 23 by the compression stroke of the piston 100.

In the discharge chamber 15 of the rear housing 5, a discharge tube 27 communicating with the discharge chamber is formed to discharge the refrigerant gas discharged into the discharge chamber 15 to the outside of the compressor 1. One end of the pipe 27 extends by a predetermined length in the discharge chamber 15 and the other end is connected to the outlet chamber.

In the compressor 1 configured as described above, the refrigerant gas is introduced into the crank chamber 13 through the refrigerant inlet 26 and then sucked into the front and rear suction chambers 16 and 17 through the suction passages.

The refrigerant gas stored in the suction chambers 16 and 17 opens and closes the reed valves of the front and rear suction valves 22 and 23 according to the reciprocating motion of the piston 100 and accordingly the front and rear suction ports 18 and 19. It is sucked into each cylinder bore 10 through.

The refrigerant gas compressed by the compression stroke of the piston 100 is forward from the respective cylinder bores 10 through the front and rear discharge ports 20 and 21 by opening and closing the reed valves of the front and rear discharge valves 24 and 25. And discharge into the rear discharge chambers 14 and 15.

Thereafter, the refrigerant gas discharged into the discharge chamber 15 of the front housing 5 is discharged to the outside of the compressor 1 through the discharge tube 27 and the discharge port 28.

At this time, the refrigerant gas introduced into the crank chamber 13 is a gas in which a refrigerant and oil are mixed, and some of them are stored in a predetermined amount in the weight reducing groove 200 formed in the piston 100, and thus, the shoe pocket 114 and the shoe. While lubricating the sliding surface with (11), the sliding surface between the shoe 11 and the swash plate 12 is lubricated. Therefore, the frictional resistance to these sliding surfaces can be reduced, thereby improving durability.

In addition, by reducing the weight of the piston by forming a weight reducing groove 200 in the piston 100, the reciprocating efficiency is increased.

1 is a cross-sectional view of a compressor having a swash plate compressor piston according to an embodiment of the present invention

2 is a cross-sectional view taken along line A-A of FIG.

3 is a perspective view of a piston for a swash plate compressor according to an embodiment of the present invention;

4 is a cross-sectional view taken along line B-B of FIG.

5 is a sectional view of a piston for a swash plate compressor according to another embodiment of the present invention;

Claims (4)

A plurality of cylinder bores 10 are formed to rotatably support the drive shaft 9 and to reciprocally receive the piston 100 formed of the head 115, the bridge 111, and the shoe pocket boss 113. The swash plate through the front and rear cylinder blocks (2, 3), the swash plate 12 that rotates by the rotation of the drive shaft (9), the shoe 11 is fastened to the shoe pocket boss 113 of the piston (100) For the swash plate type compressor to slidably sandwich the outer circumferential portion of (12) and rotate the swash plate (12) by the rotation of the drive shaft (9) to reciprocate the piston (100) in the cylinder bore (10). In the piston, At least one pair of weight reducing grooves 200 are formed in the bridge 111 and the shoe pocket boss 113 of the piston 100 at symmetrical positions. The weight reduction groove 200 formed in the bridge 111 and the weight reduction groove 200 formed in the shoe pocket boss 113 are swash plate type compressor pistons, characterized in that formed in a cylindrical shape having the same center. delete The method of claim 1, Weight reduction groove (200) formed in the bridge 111 is a piston for swash plate compressor, characterized in that the diameter is larger than the weight reduction groove (200) formed in the shoe pocket boss (113). The method of claim 1, The weight reducing groove 200 formed in the bridge 111 and the weight reducing groove 200 formed in the shoe pocket boss 113 are in communication with each other.

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