KR20070107466A - Compressor - Google Patents

Abstract

A compressor is provided to suppress thermal effect of discharged refrigerant causing loosening of a bolt and to prevent leak by forming a bolt cooling unit between a bolt connection hole and a suction chamber, which allows flow of refrigerant toward the bolt connection hole. A compressor(1) comprises front and rear housings(10,10a), front and rear cylinder blocks(20,20a), a plurality of pistons(50), and a bolt cooling unit(100). The front and the rear housings include a plurality of bolt connection holes(16,16a) in a circumferential direction, and a suction chamber(11) and a discharge chamber(12) defined by a partition wall. The front and rear cylinder blocks are installed between the front and the rear housings. The pistons are disposed inside a cylinder bore(21) of the front and the rear cylinder blocks, reciprocating in interlock with the rotation of a swash plate(40) which rotates inside a swash plate chamber(24). The bolt cooling unit is disposed between the bolt connection hole on the division portion of the suction chamber and the discharge chamber and the suction chamber, so as to allow flow of refrigerant toward the bolt connection hole, including a communication path(101) to allow communication between the bolt connection hole and the swash plate chamber.

Description

Compressor

1 is a cross-sectional view showing a conventional compressor,

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

3 is a sectional view showing a compressor according to the present invention;

4 is a cross-sectional view taken along the line B-B in FIG. 3.

<Description of Signs of Major Parts of Drawings>

1: compressor 10: front housing

10a: rear housing 11: suction chamber

12: discharge chamber 12a: first discharge chamber

12b: second discharge chamber 12c: discharge hole

13: bulkhead

15: fixing hole 16,16a: bolt fastener

16b: flesh 17: partition wall

20: front cylinder block 20a: rear cylinder block

21: cylinder bore 22: through hole

23: connecting passage 24: tribunal

25: supporter 26: needle roller bearing

30: drive shaft 40: swash plate

45: shoe 50: piston

60: valve unit 61: valve plate

62: discharge lead valve 63: suction lead valve

65: fixing pin 70: muffler

71: refrigerant inlet 72: refrigerant outlet

80: bolts

100: bolt cooling unit 101: communication path

C: Refrigerant Flow Path

The present invention relates to a compressor, and more particularly, by forming a bolt cooling unit to allow the flow of refrigerant to the bolt fastening side between the bolt fastening hole and the suction chamber formed at a position partitioning the suction chamber and the discharge chamber of the housing. The present invention relates to a compressor which reduces the temperature influence of the discharged refrigerant to prevent bolt loosening due to thermal expansion and improves durability.

In general, a compressor for automobiles sucks refrigerant gas discharged after evaporation is completed from an evaporator, converts the refrigerant gas into a refrigerant gas in a high temperature and high pressure state that is easily liquefied, and discharges the refrigerant gas.

There are various kinds of such compressors, such as a swash plate type compressor in which a piston reciprocates by the rotation of an inclined swash plate, a scroll compressor compressed by a rotational motion of two scrolls, and a rotary compressor compressed by a rotary vane. .

Among these, the reciprocating compressor that compresses the refrigerant according to the reciprocating motion of the piston includes crank type and wobble plate type in addition to the swash plate type compressor, and the swash plate type compressor also has a fixed capacity swash plate type compressor and a variable capacity type according to the use. And swash plate compressors.

1 and 2 are views showing a conventional fixed displacement swash plate type compressor, which will be briefly described with reference to the following.

As shown, the swash plate compressor 1 is coupled to the front housing 10, the front cylinder block 20 is built, the rear housing is coupled to the front housing 10 and the rear cylinder block 20a ( 10a).

Here, the discharge chamber 12 in the inside and the outside of the partition wall 13 in correspondence with the refrigerant discharge hole and the refrigerant suction hole of the valve plate 61, which will be described below, inside the front and rear housings 10 and 10a. And a suction chamber 11.

Here, the discharge chamber 12 is formed in the first discharge chamber 12a formed inside the partition 13, and formed outside the partition 13 so as to be partitioned from the suction chamber 11 and the first discharge chamber 12a. ) And a second discharge chamber 12b communicating through the discharge hole 12c.

That is, when the refrigerant in the first discharge chamber 12a passes through the discharge hole 12c having the small diameter, the refrigerant is reduced and enlarged when moving to the second discharge chamber 12b. In this case, the pulsation pressure drops and vibration and noise can be reduced.

On the other hand, a plurality of bolted fastening holes 16, 16a are formed in the circumferential direction of the suction chamber (11). The bolts in the state in which the front and rear cylinder blocks 20, 20a and the valve unit 60 are assembled between the front and rear housings 10 and 10a through the bolt fastening holes 16 and 16a. It is fastened / fixed with 80.

In addition, the front and rear cylinder blocks 20 and 20a are provided with a plurality of cylinder bores 21 in both sides of the internal swash plate chamber 24, and the front and rear cylinder blocks 20 and 20a of each other. The pistons 50 are coupled to the corresponding cylinder bore 21 so as to reciprocate linearly, and the pistons 50 are coupled via the shoe 45 to the outer circumference of the swash plate 40 inclinedly coupled to the drive shaft 30. .

Therefore, the pistons 50 interlock with the swash plate 40 rotating together with the drive shaft 30 to reciprocate inside the cylinder bore 21 of the front and rear cylinder blocks 20 and 20a.

The valve unit 60 is installed between the front and rear housings 10 and 10a and the front and rear cylinder blocks 20 and 20a.

Here, the valve unit 60 is composed of a valve plate 61 having a refrigerant suction hole and a refrigerant discharge hole, and a suction lead valve 63 and a discharge lead valve 62 installed at both sides thereof.

The valve unit 60 is assembled between the front and rear housings 10 and 10a and the front and rear cylinder blocks 20 and 20a, respectively, wherein the valve units 60 are formed on both sides of the valve plate 61. As the fixing pin 65 is inserted into the fixing hole 15 formed in the front and rear housings 10 and 10a and the front and rear cylinder blocks 20 and 20a facing the surface, the fixing pin 65 is assembled in a fixed state. will be.

On the other hand, the front and rear cylinder block 20 so that the refrigerant supplied to the swash plate chamber 24 provided between the front and rear cylinder blocks 20, 20a can flow to each of the suction chamber (11). A plurality of suction passages (not shown) are formed in the 20a, and the second discharge chamber 12b of the front and rear housings 10 and 10a passes through the front and rear cylinder blocks 20 and 20a. It is communicated with each other by the connecting passage 23 formed.

Therefore, the suction and compression of the refrigerant may be simultaneously performed in the bore 21 of the front and rear cylinder blocks 20 and 20a according to the reciprocating motion of the piston 50.

In addition, a support hole 25 is formed in the center of the front and rear cylinder blocks 20 and 20a to support the drive shaft 30, and a needle roller bearing 26 is formed in the support hole 25. It interposes and supports the said drive shaft 30 rotatably.

On the other hand, the upper part of the outer peripheral surface of the rear housing (10a) is supplied with the refrigerant transferred from the evaporator during the suction stroke of the piston 50 into the compressor (1), during the compression stroke of the piston 50 in the compressor (1) The muffler 70 is installed to discharge the compressed refrigerant toward the condenser.

Referring to the refrigerant circulation process of the compressor (1) configured as described above are as follows.

The refrigerant supplied from the evaporator is sucked into the suction part of the muffler 70 and then supplied to the swash plate chamber 24 between the front and rear cylinder blocks 20 and 20a through the refrigerant suction port 71. The refrigerant supplied to 24 flows into the suction chamber 11 of the front and rear housings 10 and 10a along the suction passage formed in the front and rear cylinder blocks 20 and 20a.

Thereafter, the suction lead valve 63 is opened during the suction stroke of the piston 50. In this case, the refrigerant in the suction chamber 11 is sucked into the cylinder bore 21.

In the compression stroke of the piston 50, the refrigerant inside the cylinder bore 21 is compressed. At this time, the discharge lead valve 62 is opened, and the refrigerant is firstly formed in the front and rear housings 10 and 10a. It flows into the discharge chamber 12a and finally discharges through the refrigerant discharge port 72 of the muffler 70 through the second discharge chamber 12b to the discharge portion of the muffler 70 and then flows to the condenser.

Meanwhile, the refrigerant compressed in the cylinder bore 21 of the front cylinder block 20 is discharged to the first discharge chamber 12a of the front housing 10 and then flows to the second discharge chamber 12b. Along the connecting passage 23 formed in the front and rear cylinder blocks 20 and 20a, the second discharge chamber 12b of the rear housing 10a flows to the refrigerant discharge port 72 together with the refrigerant therein. Through the discharge portion of the muffler 70 is discharged.

On the other hand, one of the plurality of bolted fastening holes (16, 16a) formed in the circumferential direction of the suction chamber 11 is formed at a position partitioning the suction chamber 11 and the second discharge chamber (12b), that is, The second discharge chamber 12b is partitioned from the suction chamber 11 by the flesh 16b and the partition wall 17 forming the bolt fastening holes 16a formed at both sides.

However, the high temperature / high pressure refrigerant discharged from the cylinder bore 21 to the first discharge chamber 12a during the compression stroke of the piston 50 passes through the second discharge chamber 12b to the muffler 70 side. In this process, a high temperature of the refrigerant passing through the second discharge chamber 12b is caused by the bolt fastening hole (b) through the flesh portion 16b of the bolt fastening hole 16a in contact with the second discharge chamber 12b. Heat is transferred to 16a) side.

That is, the bolt fastening hole 16a is subjected to thermal expansion while being affected by the temperature of the discharge refrigerant, causing the bolt 80 fastened to the bolt fastening hole 16a to be loosened, and at the same time, There were many problems in durability such as leakage.

An object of the present invention for solving the above-mentioned problems is to form a bolt cooling unit to allow the flow of the refrigerant to the bolt fastening side between the bolt fastening hole and the suction chamber formed in the position partitioning the suction chamber and the discharge chamber The present invention provides a compressor that prevents bolt loosening due to thermal expansion by reducing the temperature influence of the discharged refrigerant and prevents leakage and improves durability.

The present invention for achieving the above object is formed between the front and rear housings and the front and rear housings in which a plurality of bolt fastening holes are formed in the circumferential direction and suction and discharge chambers are formed between the partition walls. A compressor comprising a front and rear cylinder block to be installed and a plurality of pistons installed in the cylinder bore of the front and rear cylinder block and reciprocating in conjunction with the rotational movement of the swash plate rotating in the swash plate chamber, A bolt cooling part is formed between the bolt fastening hole and the suction chamber formed at a position that partitions the suction chamber and the discharge chamber among the bolt fastening holes so as to allow the flow of the refrigerant to the bolt fastening side.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Repeated description of the same construction and operation as in the prior art will be omitted.

3 is a cross-sectional view showing a compressor according to the present invention, Figure 4 is a cross-sectional view taken along the line B-B in FIG.

First, the compressor 1 according to the present invention will be briefly described. The front and rear housings in which the discharge chamber 12 and the suction chamber 11 are partitioned / formed on the inside and the outside, respectively, with the partitions 13 interposed therebetween. (10) (10a) and the front and rear cylinder block is provided between the front and rear housings (10, 10a) and a plurality of cylinder bores (21) are formed in both sides of the internal swash plate chamber ( 20, 20a, a drive shaft 30 rotatably supported by the front and rear cylinder blocks 20, 20a, a swash plate 40 and the swash plate 40 rotating together with the drive shaft 30. It is coupled to the outer circumference of the through the shoe 45 is composed of a plurality of piston 50 for reciprocating the inside of the cylinder bore (21).

Here, the discharge chambers 12 of the front and rear housings 10 and 10a are formed in the first discharge chamber 12a formed inside the partition 13 and the outside of the partition 13 to form a suction chamber ( And a second discharge chamber 12b communicating with the first discharge chamber 12a and the discharge hole 12c.

That is, when the refrigerant in the first discharge chamber 12a passes through the discharge hole 12c having the small diameter, the refrigerant is reduced and enlarged when moving to the second discharge chamber 12b. The pulsation pressure drops to reduce vibration and noise.

Meanwhile, a plurality of bolting holes 16 and 16a are formed in the circumferential direction of the suction chamber 11 of the front and rear housings 10 and 10a, and the bolting holes 16 and 16a are formed. Through the front and rear housings 10 and 10a are fastened / fixed with bolts 80 in a state of assembling the front and rear cylinder blocks 20 and 20a and the valve unit 60 therebetween.

In addition, the front and rear cylinder block 20 so that the suction refrigerant supplied to the swash plate chamber 24 provided between the front and rear cylinder block 20, 20a can flow to each of the suction chamber (11). A plurality of suction passages (not shown) are formed in the (20a), the second discharge chamber (12b) of the front and rear housing (10, 10a) is the front and rear cylinder block (20, 20a). It communicates with each other by the connecting passage 23 formed through.

In addition, the valve unit 60 is assembled between the front and rear housings 10 and 10a and the front and rear cylinder blocks 20 and 20a, and the valve unit 60 is the front and rear cylinder blocks. The suction lead valve 63, the refrigerant suction hole, and the refrigerant discharge hole are formed in the valve plate 61 and the discharge lead valve 62 in the order of (20) and (20a).

Here, the valve unit 60 is a fixing hole formed on the opposite surface of the front and rear housing blocks 10, 10a and the front and rear cylinder blocks 20, 20a provided on both sides of the fixing pin (65) It is inserted / fixed into (15).

In addition, a support hole 25 is formed in the center of the front and rear cylinder blocks 20 and 20a to support the drive shaft 30, and a needle roller bearing 26 is formed in the support hole 25. It interposes and supports the said drive shaft 30 rotatably.

On the other hand, the upper portion of the outer peripheral surface of the rear housing (10a) when the suction stroke of the piston 50 is supplied with the refrigerant transferred from the evaporator through the refrigerant suction port 71 into the compressor (1), during the compression stroke of the piston 50 The muffler 70 is installed to discharge the refrigerant compressed in the compressor 1 toward the condenser through the refrigerant discharge port 72.

The compressor 1 is driven by receiving the power of the engine selectively by the intermittent action of the electromagnetic clutch (not shown).

In the compressor (1), one of the plurality of bolted fastening holes (16, 16a) formed around the suction chamber 11 of the front and rear housing (10) (10a) is the suction chamber (11) and The second discharge chamber 12b is formed at a position for dividing the second discharge chamber 12b. That is, the second discharge chamber 12b is formed by the flesh portion 16b and the partition wall 17 forming the bolt fastening holes 16a formed at both sides. It is partitioned from the suction chamber 11.

Therefore, in the present invention, the refrigerant is directed to the bolt fastening hole 16a between the bolt fastening hole 16a and the suction chamber 11 formed at a position that divides the suction chamber 11 and the second discharge chamber 12b. The bolt cooling unit 100 is formed to allow flow.

That is, the bolt cooling part 100 allows a part of the suction refrigerant to flow toward the bolt fastening hole 16a, so that the bolt fastening hole 16a is cooled by the suction refrigerant, so that the temperature of the discharge refrigerant is not affected. The bolt 80 is prevented from loosening due to thermal expansion.

The bolt cooling unit 100 is formed by stepping a communication path 101 for communicating the suction chamber 11 and the bolt fastening hole 16a in the flesh portion 16b constituting the bolt fastening hole 16a, Accordingly, by allowing the bolt fastening hole 16a to communicate with the suction chamber 11 and the swash plate chamber 24, the suction refrigerant introduced into the swash plate chamber 24 flows toward the bolt fastening hole 16b and the bolt fastening hole The suction refrigerant flowing in the 16b can move to the suction chamber 11 through the communication path 101.

Therefore, in the compressor 1, the suction refrigerant sucked into the swash plate chamber 24 is moved to the suction chamber 11 through the suction passages (not shown) of the front and rear cylinder blocks 20 and 20a. A refrigerant flow path C which moves to the suction chamber 11 via the bolt fastening hole 16a is further formed. In this way, the oil contained in the refrigerant is also supplied to the bolt fastening hole 16a in the process of moving the suction refrigerant of the swash plate chamber 24 to the suction chamber 11 via the bolt fastening hole 16a. 16a) is cooled, thereby preventing thermal expansion by the discharged refrigerant.

That is, the bolts 80 pass through the front and rear cylinder blocks 20 and 20a and the valve unit 60 to fasten / engage the front and rear housings 10 and 10a with the bolts 80. The ball 22 is formed. Therefore, the suction refrigerant sucked into the swash plate chamber 24 may flow to the bolt fastening hole 16a through the through hole 22, and the suction refrigerant flowing into the bolt fastening hole 16a is the communication path 101. ) Will be moved to the suction chamber (11).

In addition, since the refrigerant in the suction chamber 11 is always in contact with the bolt fastening hole 16a by the communication path 101, the cooling effect of the bolt fastening hole 16a can be further improved.

On the other hand, the communication path 101 not only serves to allow the suction refrigerant of the swash plate chamber 24 to flow into the suction chamber 11 via the bolt fastening hole 16a, but also the refrigerant in the suction chamber 11 It is to be circulated to the bolt fastening hole (16a) side. That is, the communication path 101 is formed in a "U" shape in communication with the bolt fastening hole 16a, so that the refrigerant in the suction chamber 11 passes through the communication path 101 with the bolt fastening hole 16a. By circulating through), the oil contained in the refrigerant is also circulated together to maximize the cooling effect.

In addition, a part of the refrigerant in the suction chamber 11 is bolted through the communication path 101 by the rotation operation of the swash plate 40 rotating in the swash plate chamber 24 in addition to the refrigerant flow path C described above. After the flow to the fastening hole (16a) side may be moved to the swash plate chamber 24, and in this process with water as the refrigerant passes through the bolt fastening hole (16a) can be obtained a cooling effect.

As described above, according to the compressor 1 of the present invention, the plurality of bolted holes 16, 16a formed in the circumferential direction in the suction chamber 11 of the front and rear housings 10, 10a. The bolt cooling part 100 is formed between the bolt fastening hole 16a formed in the position which partitions the suction chamber 11 and the discharge chamber 12, and the suction chamber 11, and it suctions to the said bolt fastening hole 16a side. As the refrigerant flows, the bolt fastening hole 16a is cooled.

Therefore, the high pressure / high temperature refrigerant discharged from the cylinder bore 21 moves to the first discharge chamber 12a of the front and rear housings 10 and 10a during the compression stroke of the piston 50. The refrigerant moved to the first discharge chamber 12a passes through the discharge hole 12c to the second discharge chamber 12b, and then through the refrigerant discharge port 72 of the muffler 70 to a condenser. Will move.

Here, the discharge refrigerant passing through the second discharge chamber 12b is a high pressure / high temperature refrigerant, and the high temperature of the refrigerant is transferred to the surroundings, wherein the high temperature of the discharge refrigerant is equal to the second discharge chamber 12b. Even if heat is transferred to the bolt fastening hole 16a in contact with the bolt, the cooling is performed by the bolt cooling part 100, thereby preventing thermal expansion, thereby preventing loosening of the bolt 80.

As described above, in the present invention, a fixed capacity type swash plate type is formed in which the bolt cooling part 100 is formed to allow the suction refrigerant to flow toward the bolt fastening hole 16a in contact with the second discharge chamber 12b. Although only the case of application to the compressor 1 has been described, the present invention is not limited thereto, and can be applied to various types of compressors such as a variable displacement swash plate compressor and an electric compressor in the same method and configuration, and the same effect can be obtained.

According to the present invention, the temperature of the discharge refrigerant by forming a bolt cooling unit to allow the flow of the suction refrigerant to the bolt fastening side between the bolt fastening hole and the suction chamber formed at the position partitioning the suction chamber and the second discharge chamber By reducing the impact, the bolts are not loosened due to thermal expansion, leaks are prevented, and durability is improved.

Claims (2)

The front and rear housings 10 having a plurality of bolted fastening holes 16 and 16a formed in the circumferential direction and the suction chamber 11 and the discharge chamber 12 are formed with the partition 13 therebetween. 10a), The front and rear cylinder blocks 20 and 20a installed between the front and rear housings 10 and 10a, And a plurality of pistons 50 installed in the cylinder bore 21 of the front and rear cylinder blocks 20 and 20a and reciprocating in conjunction with the rotational movement of the swash plate 40 rotating in the swash plate chamber 24. In the compressor consisting of, The bolt fastening hole (16) between the bolt fastening hole 16a and the suction chamber 11 formed at a position that divides the suction chamber 11 and the discharge chamber 12 among the plurality of bolt fastening holes 16 and 16a ( Compressor, characterized in that the bolt cooling unit (100) is formed to enable the flow of the refrigerant to the 16a) side. The method of claim 1, The bolt cooling part 100 forms a communication path 101 for communicating the suction chamber 11 and the bolt fastening hole 16a in the flesh part 16b constituting the bolt fastening hole 16a. And 16a) in communication with the suction chamber (11) and the swash plate chamber (24).

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