Compressor

Abstract

The present invention relates to a compressor, which has a bolt-cooling part formed between a suction chamber and a bolt fastening hole formed at a position, where the suction chamber and a discharge chamber of a housing are partitioned from each other, for allowing for a flow of refrigerant toward the bolt fastening hole to reduce an influence of temperature of discharged refrigerant, thereby preventing loosening of a bolt due to a thermal expansion, and improving durability.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG. 1 is a sectional view of a compressor according to a prior art;

FIG. 2 is a sectional view taken along the line of A-A of FIG. 1;

FIG. 3 is a sectional view of a compressor according to the present invention; and

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

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Reference will be now made in detail to the preferred embodiment of the present invention with reference to the attached drawings.

In the present invention, description of the same parts and operations as the prior art will be omitted.

FIG. 3 is a sectional view of a compressor according to the present invention, and FIG. 4 is a sectional view taken along the line of B-B of FIG. 3.

First, the compressor 1 according to the present invention includes: front and rear housings 10 and 10a respectively having discharge chambers 12 and suction chambers 11 formed therein, the discharge chamber 12 being partitioned from the suction chamber 11 by a partition wall 13 formed therebetween; front and rear cylinder blocks 20 and 20a mounted between the front housing 10 and the rear housing 10a and having a plurality of cylinder bores 21 formed in both directions of a swash plate chamber 24 formed between the front cylinder block 20 and the rear cylinder block 20a; a driving shaft 30 rotatably supported on the front and rear cylinder blocks 20 and 20a; a swash plate 40 rotating together with the driving shaft 30; and a plurality of pistons 50 combined to the outer periphery of the swash plate 40 by interposing shoes 45 between the swash plate 40 and the pistons 50 and performing a reciprocating motion inside the cylinder bores 21.

Here, each of the discharge chambers 12 of the front and rear housings 10 and 10a includes: a first discharge chamber 12a formed inside a partition wall 13; and a second discharge chamber 12b formed outside the partition wall 13, partitioned from the suction chamber 11, and fluidically communicated with the first discharge chamber 12a through a discharge hole 12c. That is, the second discharge chamber 12b is partitioned from the suction chamber 11 by partition walls 16b and 17 formed at both sides of the second discharge chamber 12b.

Accordingly, refrigerant of the first discharge chamber 12a is reduced while passing through the discharge hole 12c of a small diameter but expanded while moving to the second discharge chamber 12b, and so, a pulsating pressure drops during the process that the refrigerant is reduced and expanded, whereby vibration and noise can be reduced.

Meanwhile, a plurality of bolt fastening holes 16 and 16a are formed in a circumferential direction of the suction chambers 11 of the front and rear housings 10 and 10a. So, the front and rear housings 10 and 10a can be coupled and fixed with each other by fastening bolts 80 into the bolt fastening holes 16 and 16a in a state where the front and rear cylinder blocks 20 and 20a and valve units 60 are assembled between the front and rear housings 10 and 10a.

Moreover, the front and rear cylinder blocks 20 and 20a respectively have a plurality of suction passageways (not shown) formed in such a way that inhaled refrigerant supplied to the swash plate chamber 24 disposed between the front cylinder block 20 and the rear cylinder block 20a flows to each suction chamber 11. The second discharge chambers 12b of the front and rear housings 10 and 10a are fluidically communicated with each other via the communication passageway 23 perforating through the front and rear cylinder blocks 20 and 20a.

Furthermore, the valve units 60 are respectively assembled between the front housing 10 and the front cylinder block 20 and between the rear housing 10a and the rear cylinder block 20a. Each valve unit 60 includes a suction lead valve 63, a valve plate 61 having a refrigerant suction hole and a refrigerant discharge hole, and a discharge lead valve 62, which are formed in order from a direction of the front and rear cylinder blocks 20 and 20a.

Here, the valve units 60 are combined and fixed to the front and rear housings 10 and 10a and the front and rear cylinder blocks 20 and 20a in such a way that fixing pins 65 formed at both sides of the valve units 60 are inserted into fixing holes 15 formed on faces of the front and rear housings 10 and 10a and faces of the front and rear cylinder blocks 20 and 20a, which are located opposite with each other.

In addition, the front and rear cylinder blocks 20 and 20a respectively have support holes 25 formed at the center thereof for supporting the driving shaft 30, and needle roller bearings 26 are respectively mounted in the support holes 25 to rotatably support the driving shaft 30.

Meanwhile, a muffler 70 is mounted on the upper portion of the outer peripheral surface of the rear housing 10a to supply the refrigerant transferred from an evaporator to the compressor 1 through a refrigerant suction hole 71 during a suction stroke of the pistons 50 and to discharge the refrigerant compressed in the compressor 1 toward a condenser through a refrigerant discharge hole 72 during a compression stroke of the pistons 50.

Such a compressor 1 is operated by selectively receiving driving power of an engine by a restriction action of an electronic clutch (not shown).

In the compressor 1, one of the plural bolt fastening holes 16 and 16a formed on the circumference of the suction chamber 11 is formed at a partition wall 16b where the second discharge chamber 12b is partitioned from the suction chamber 11.

In the present invention, a bolt-cooling part 100 is formed between the suction chamber 11 and the bolt fastening hole 16a, which is formed at the partition wall 16b where the second discharge chamber 12b is partitioned from the suction chamber 11, to allow for a flow of the refrigerant toward the bolt fastening hole 16a.

That is, the bolt-cooling part 100 allows that some of the inhaled refrigerant flows toward the bolt fastening hole 16a, so that the bolt fastening hole 16a is cooled by the inhaled refrigerant to thereby prevent an influence of temperature of the discharged refrigerant and loosening of the bolt 80 by a thermal expansion.

The bolt-cooling part 100 is constructed by tieredly forming a communication passageway 101 on the partition wall 16b on which the bolt fastening hole 16a is formed to fluidically communicate the suction chamber 11 and the bolt fastening hole 16a with each other, and so, the bolt fastening hole 16a can be communicated with the suction chamber 11 and the swash plate chamber 24. So, the inhaled refrigerant introduced into the swash plate chamber 24 flows toward the bolt fastening hole 16a, and the inhaled refrigerant flowing to the bolt fastening hole 16a moves to the suction chamber 11 through the communication passageway 101.

Therefore, besides the channel where the refrigerant inhaled into the swash plate chamber 24 flows to the suction chamber 11 through the suction passageways (not shown) of the front and rear cylinder blocks 20 and 20a, the compressor 1 according to the present invention has additional refrigerant flow channel (C) where the refrigerant flows to the suction chamber 11 through the bolt fastening hole 16a. As described above, during the process that the inhaled refrigerant of the swash plate chamber 24 flows to the suction chamber 11 through the bolt fastening hole 16a, oil mixed with the refrigerant is also supplied to the bolt fastening hole 16a to cool the bolt fastening hole 16a, whereby the thermal expansion by the discharged refrigerant can be prevented.

That is, the front and rear cylinder blocks 20 and 20a and the valve units 60 respectively have through holes 22 to which the bolts 80 are inserted and fastened to couple and fix the front and rear housings 10 and 10a with each other via the bolts 80. So, the refrigerant inhaled to the swash plate chamber 24 can flow to the bolt fastening hole 16a through the through holes 22, and the inhaled refrigerant flowing to the bolt fastening hole 16a moves to the suction hole 11 through the communication passageway 101.

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

Meanwhile, the communication passageway 101 serves to flow the inhaled refrigerant of the swash plate chamber 24 to the suction chamber 11 through the bolt fastening hole 16 and to circulate the refrigerant of the suction chamber 11 toward the bolt fastening hole 16a. That is, since the communication passageway 101 is formed in an “U” shape fluidically communicating with the bolt fastening hole 16a, the refrigerant of the suction chamber 11 and oil mixed with the refrigerant can be circulated while passing through the bolt fastening hole 16a through the communication passageway 101, whereby the cooling effect is maximized.

Additionally, besides the refrigerant flow channel (C) described above, some of the refrigerant contained in the suction chamber 11 can flow toward the bolt fastening hole 16a and move to the swash plate chamber 24 through the communication passageway 101 by the rotating motion of the swash plate 40 in the swash plate chamber 24. Of course, also during the above process, a good cooling effect can be obtained while the refrigerant passes through the bolt fastening hole 16a.

As described above, according to the compressor 1 of the present invention, the bolt-cooling part 100 is formed between the suction chamber 11 and the bolt fastening hole 16a, which is located at the partition wall 16b where the discharge chamber 12 is partitioned from the suction chamber 11, out of the plural bolt fastening holes 16 and 16a formed in the circumferential direction of the suction chambers 11 of the front and rear housings 10 and 10a, so that the inhaled refrigerant flows toward the bolt fastening hole 16a to cool the bolt fastening hole 16a.

So, during the compression stroke of the pistons 50, the high-pressure and high-temperature refrigerant discharged from the cylinder bores 21 moves to the first discharge chambers 12a of the front and rear housings 10 and 10a, moves to the second discharge chambers 12b through the discharge hole 12c, and then, moves to the condenser through the refrigerant discharge hole 72 of the muffler 70.

Here, the discharged refrigerant passing through the second discharge chamber 12b is the high-pressure and high-temperature refrigerant, and the high temperature of the refrigerant is transferred to components adjacent to the refrigerant. In this instance, even though the high temperature of the discharged refrigerant is transferred toward the bolt fastening hole 16a which is in contact with the second discharge chamber 12b, the bolt fastening hole 16a is cooled by the bolt-cooling part 100 to thereby prevent the thermal expansion and loosening of the bolt 80.

The present invention is described in connection with an example that the structure having the bolt-cooling part 100 to allow the flow of the inhaled refrigerant toward the bolt fastening hole 16a, which is in contact with the second discharge chamber 12b, is applied to the fixed capacity swash plate type compressor 1, but is not restricted to the above, and can be applied to compressors of various kinds, such as a variable capacity swash plate type compressor, a motor driven compressor and others, in the same method and structure as the above to obtain the same effects.

As described above, according to the present invention, the compressor can prevent loosening of the bolt due to the thermal expansion, prevent a leakage of the refrigerant, and improve durability, since the bolt-cooling part is formed between the suction chamber and the bolt fastening hole formed at a position, where the suction chamber and the discharge chamber are partitioned from each other, for allowing for a flow of refrigerant toward the bolt fastening hole to reduce an influence of temperature of discharged refrigerant.

While the present invention has been described with reference to the particular illustrative embodiment, it is not to be restricted by the embodiment but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiment without departing from the scope and spirit of the present invention.

Claims

1. A compressor comprising: front and rear housings, each housing having a plurality of bolt fastening holes formed in a circumferential direction therein, a suction chamber and a discharge chamber partitioned from each other by partition walls formed therebetween, and a bolt-cooling part formed between the suction chamber and the bolt fastening hole formed at the partition wall where the suction chamber and the discharge chamber are partitioned from each other to allow for a flow of refrigerant toward the bolt fastening hole;front and rear cylinder blocks mounted between the front housing and the rear housing; anda plurality of pistons mounted inside cylinder bores of the front and rear cylinder blocks for performing a reciprocating motion in cooperation with a rotating motion of a swash plate rotating in a swash plate chamber.

2. The compressor according to claim 1, wherein the bolt-cooling part is a communication passageway formed on the partition wall on which the bolt fastening hole is formed for fluidically communicating the suction chamber and the bolt fastening hole with each other.