KR20030025070A - Structure for preventing liquid compress of compressor - Google Patents

Abstract

PURPOSE: A structure for preventing compression of liquid of a compressor is provided to prevent liquefied refrigerant and oil from flowing into a cylinder of the compressor when the compressor is stopped. CONSTITUTION: A structure includes a muffler(60) formed in a housing of a compressor, having spaces with upper parts opening formed on both sides of a pair of first partitions(90), and having a suction hole and a discharge hole(61a) formed on one side of a bottom thereof to be fluidically connected with a cylinder; a manifold(70) joined to an upper part of the muffler, forming a suction chamber and a discharge chamber by a space connected with the muffler and having a suction hole connected to an evaporator side and a discharge hole(71a) connected with a condenser side; a pair of the first partitions formed close to the muffler side suction hole and the discharge hole of the suction chamber and the discharge chamber to partition the spaces of the muffler; a pair of second partitions(90a) dividing the suction chamber and the discharge chamber into two channels(P1,P2), respectively, by partitioning the spaces of the manifold correspondingly with the first partitions, and having refrigerant flowing holes(90b) formed thereon, respectively; and a pair of third partitions(92) formed on the manifold to form the first channel of the suction chamber and the first channel of the discharge chamber connected with the suction hole and the discharge hole of the manifold to be approximately U-shaped.

Description

Compressor Liquid Compression Prevention Structure {STRUCTURE FOR PREVENTING LIQUID COMPRESS OF COMPRESSOR}

The present invention relates to a compressor, which prevents liquid refrigerant and oil from flowing into the compressor when the compressor is stopped, thereby preventing noise and compressor damage due to the compression of the liquid refrigerant and oil, and allowing the compressor driving unit to be properly lubricated. The present invention relates to a liquid compression preventing structure.

In a vehicle air conditioner, a compressor sucks a gaseous refrigerant and compresses the same at high temperature and high pressure.

Since the compressor is installed next to an engine with a large heat capacity and is exposed to the outside air, its internal temperature changes significantly according to the temperature condition of the engine and the outside air temperature. On the other hand, since the evaporator disposed in the vehicle is not exposed to the outside air, its temperature change is not greater than that of the compressor. That is, a large temperature deviation occurs in the compressor and the evaporation period.

The temperature deviation of the air conditioning apparatus triggers the movement of the refrigerant and oil. If the temperature of a particular part of the air conditioning system is high, the internal fluid will expand and move to another part with low pressure. That is, the refrigerant evaporates in the high temperature portion and moves to the low temperature portion to condense. In this process, the oil contained in the refrigerant is also moved.

At this time, since the compressor has a large temperature deviation such as an evaporator, the movement of the refrigerant and oil may be concentrated in the compressor, or the refrigerant and oil may escape from the compressor and collect in other parts.

First, when refrigerant and oil are concentrated in the compressor, when the compressor is operated, the liquid refrigerant and oil remaining in the compressor are compressed. In this case, the liquid is hard to be compressed, noise is generated during compression, and excessive force is applied to damage the parts.

Secondly, if the refrigerant and oil escape from the compressor and collect in other parts, when the compressor is operated, the oil for lubricating the compressor part is removed from the compressor, and thus, the compressor driving part may be worn and fixed.

For example, Japanese Patent Application Laid-Open No. 9-126561 discloses a heater for preventing the compression of the liquid refrigerant, and a heater is installed inside the cylinder of the compressor, and the liquid refrigerant is vaporized by heat generated by the heater before the compressor is operated. It is.

However, Japanese Patent Application Laid-open No. Hei 9-126561 is not a technique for blocking liquid refrigerant and oil from flowing into the cylinder, but rather a vaporization of the liquid refrigerant and oil introduced into the cylinder, so that parts must be added and not vaporized by the heater. There is a problem that the liquid refrigerant and the oil is compressed.

In addition, it is difficult to install a heater or the like in a narrow space of the cylinder, and there is a problem in that the cost increases because a heater, a controller for controlling the operation of the heater, a power source, and the like are required.

The present invention has been invented to solve the above problems, and an object of the present invention is to provide a liquid compression preventing structure of a compressor that can prevent the liquid refrigerant from flowing into the compressor cylinder when the compressor is stopped.

Another object of the present invention is to prevent liquid refrigerant from flowing into the compressor at low cost.

1 is a perspective view of an external manifold of a typical compressor separated.

Figure 2 is a cross-sectional view showing the inside of a typical compressor.

Figure 3 is an exploded perspective view of the manifold of the compressor to which the embodiment according to the present invention is applied.

4 is a plan view of a manifold to which an embodiment according to the present invention is applied.

5 is a cross-sectional view taken along the line VV of FIG. 4.

6 is a cross-sectional view taken along the line VI-VI of FIG. 4.

<Description of the symbols for the main parts of the drawings>

60: muffler, 61a, 71a: discharge hole

62a, 72a: suction hole, 70: manifold

80: discharge chamber, 81: suction chamber

90,91: first bulkhead, 90a, 91a: second bulkhead

90b, 91b: Refrigerant distribution hole, 92,93: Third bulkhead

P1, P3: U-shaped flow path,

The liquid compression preventing structure of the compressor according to the present invention for achieving the above object is formed in the compressor housing, the space is formed in the upper side on both sides with the partition wall therebetween, while the cylinder on one side of the bottom surface of each space A muffler having a suction hole and a discharge hole communicating with the muffler; A manifold coupled to an upper portion of the muffler to form a suction chamber and a discharge chamber by a space communicating with the muffler, and having a suction hole connected to the evaporator side and a discharge hole connected to the condenser side; A pair of first partition walls which are respectively formed adjacent to the muffler side suction holes and the discharge holes of the suction chamber and the discharge chamber to partition respective spaces of the muffler; A pair of second partition walls each partitioning the suction chamber and the discharge chamber into two flow paths by partitioning respective spaces of the manifold corresponding to the first partition walls and having refrigerant flow holes formed at predetermined heights; And a pair of third partition walls formed in the manifold to form a first channel of the suction chamber connected to the suction hole and the discharge hole of the manifold and a first channel of the discharge chamber in a substantially U shape. When the operation of the compressor is stopped, the liquid refrigerant and oil are filled in the U-shaped flow path, so that the refrigerant and the oil are configured to not enter or exit through the refrigerant distribution hole.

First, the structure of the compressor will be briefly described in order to explain the structure of the compressor according to the present invention. Particularly, the present invention relates to a swash plate type compressor of the double head piston type of the migraine and the double head piston type of the swash plate type compressor. Explain.

1 is a perspective view of a compressor with a manifold separated, and FIG. 2 is a cross-sectional view illustrating an internal structure of the compressor.

As shown in FIG. 1, the compressor 10 is coupled to the front housing 20 and the front housing 20 which is located on the pulley 1 side and has a front cylinder 21 (shown in FIG. 2), and is rearward. It has a rear housing 30 equipped with a cylinder 31 (shown in FIG. 2).

As shown in FIG. 2, the front and rear cylinders 21 and 31 are provided with a plurality of bores 21a and 31a therein. Both pistons 40 are coupled so as to linearly reciprocate over the bores 21a and 31a corresponding to each other of the front and rear cylinders 21 and 31. These pistons 40 are coupled along the outer circumference of the swash plate 50, which is affixed to the drive shaft 51. That is, the pistons 40 reciprocate inside the bores 21a and 31a of the front and rear cylinders 21 and 31 by the phase change of the swash plate 50 that is rotated according to the rotation of the drive shaft 51.

Between the front housing 20 and the front cylinder 21, and between the rear housing 30 and the rear cylinder 31, the front and rear valve assembly 22 (32) having a gasket, a discharge valve, a valve plate and a suction valve, respectively. ) Is installed. Suction passages 23 and 33 and discharge passages 24 and 34 are respectively formed on the inner surfaces of the front and rear housings 20 and 30 in correspondence with the discharge port of the discharge valve and the suction port of the suction valve. The suction passages 23 and 33 and the discharge passages 24 and 34 of the front and rear housings 20 and 30 are connected to each other through a connecting passage (not shown) formed in the front and rear cylinders 20 and 30 to be rearward. In addition to the bore 31a of the cylinder 31, the suction and compression of the refrigerant may be performed in accordance with the movement of the piston 40 in the beam 21a of the front cylinder 21.

In the upper portion of the outer circumferential surface of the rear housing 30, the refrigerant supplied from the evaporator at the time of the suction stroke of the piston 40 passes through the suction passage 33 of the rear housing 30. 30a), a muffler 60 is formed which guides the refrigerant to be compressed and discharged toward the condenser through the discharge passage 34 of the rear cylinder 31 during the compression stroke of the piston 40.

The muffler 60 communicates with the first space 61 having a discharge hole 61a communicating with the discharge passage 34 of the rear housing 30 and the suction passage 33 of the rear housing 30. And a second space 62 provided with a suction hole 62a.

The manifold 70 that covers the upper opening of the muffler 60 is coupled to the upper portion of the muffler 60.

The manifold 70 includes a third space 71 having a discharge hole 71a (see FIG. 3) connected to the condenser side, and a suction hole 72a (see FIG. 3) connected to the evaporator side. Four spaces 72 are formed.

That is, as shown in FIG. 2, when the manifold 70 is coupled to the muffler 60, the discharge chamber 80 is formed by the first and third spaces 61 and 71, and the second and fourth spaces ( The suction exit chamber 81 is formed by 62 and 72.

Hereinafter, a preferred embodiment of the liquid compression preventing structure of the compressor according to the present invention based on the above-described compressor will be described in detail with reference to the accompanying drawings.

3 is a perspective view of the manifold of the compressor to which the liquid compression preventing structure of the compressor according to the present invention is separated, FIG. 4 is a plan view of the manifold to which the embodiment according to the present invention is applied, and FIG. 5 is V-V of FIG. 4. 6 is a cross-sectional view taken along the line VI-VI of FIG. 4.

As shown in FIG. 3, the liquid compression preventing structure of the compressor according to the present invention includes the discharge holes 61a and the suction holes in the first space 61 and the second space 62 of the muffler 60. The lower end is first formed in the first partition walls 90 and 91 partitioning the spaces 61 and 62 and the spaces 71 and 72 of the manifold 70 so as to be proximate to the side 62a. It is formed so as to be connected to the upper end of the partition (90, 91) so that the suction chamber 81 and the discharge chamber 80 to each of two flow paths (P1), P2 (P3) (P4) (shown in Figure 4) Manifold of the first partitions P1 and P3 (shown in FIGS. 5 and 6) partitioned by the second partition walls 90a and 91a to be partitioned and the first and second partition walls 90 and 91. It is comprised by the 3rd partition walls 92 and 93 formed in the 70 side, and form this flow path P1 and P3 in substantially U-shaped flow path.

The second partitions 90a and 91a have substantially the same height as the suction hole 72a and the discharge hole 71a of the manifold 70, while the suction hole 62a and the discharge hole 61a of the bottom surface of the muffler 60 are formed. Coolant distribution holes 90b and 91b which are inclined downward toward the side are formed, respectively.

The working state of the liquid compression preventing structure of the compressor according to the present invention configured as described above is as follows.

When the air conditioner is deactivated, the liquid refrigerant and oil flowing through the refrigeration cycle are moved to the lower position by gravity. As shown in FIG. 5, the refrigerant and oil in the discharge line (not shown) after the discharge hole 71a are discharged from the discharge chamber 80 between the muffler 60 and the manifold 70 through the discharge hole 71a. It flows into the U-shaped first flow path P1.

The liquid refrigerant and oil are filled in the U-shaped first flow path P1 in the discharge chamber 80 partitioned by the third partition wall 92, and the gas refrigerant remaining in the discharge chamber 80 floats due to specific gravity. It flows into the cylinders 21 and 31 of the compressor through the discharge hole 61a of the muffler 60.

While the gaseous refrigerant is introduced into the compressor cylinders 21 and 31, the liquid refrigerant and oil are continuously filled in the U-shaped first flow path P1. When the liquid refrigerant and the oil filled in the U-shaped flow path P1 have the same height with the partition 90 therebetween, the refrigerant and the oil do not flow into the compressor cylinders 21 and 31 even when pressure is applied. This phenomenon can be seen as a function similar to the drain trap.

Meanwhile, the refrigerant and the oil in the suction line before the suction port are suction chambers formed by the muffler 60 and the manifold 70 through the suction hole 72a of the manifold 70, as shown in FIG. 6. It flows into the U-shaped third flow path P3 of 81.

The liquid refrigerant and the oil are filled in the U-shaped flow path P3, and the gas refrigerant remaining in the suction chamber 81 is caused by the specific gravity of the cylinders 21 and 31 of the compressor through the suction hole 62a of the muffler 60. (See Fig. 2).

When the liquid refrigerant and the oil are filled in the U-shaped third flow path P3 and both sides have the same height with the partition 93 interposed therebetween, the compressor cylinders 21 and 31 are completely filled with the gas refrigerant, and the suction chamber Since the U-shaped third flow path P3 of 81 is completely filled with the liquid refrigerant and the oil, the liquid refrigerant and the oil do not flow into the suction chamber 81 anymore.

Therefore, if the temperature of the compressor is higher than the evaporator, condenser, etc., the refrigerant and oil inside the compressor try to escape. On the contrary, if the temperature of the compressor is relatively lower than the evaporator, condenser, etc., the refrigerant and oil try to flow into the compressor. A small amount of liquid refrigerant and oil are stored in the U-shaped flow paths P1 and P3 of the suction chamber 81 and the discharge chamber 80 of the 60, so that the refrigerant and oil in the compressor cylinders 21 and 31 escape. In addition, the refrigerant and oil do not flow into the compressor cylinders 21 and 31.

As described above, according to the liquid compression preventing structure of the compressor according to the present invention, the liquid refrigerant and oil circulating the refrigeration cycle by the structure improvement of the muffler 60 and the manifold 70 of the compressor is a cylinder ( 21) (31) is not introduced because it can reduce the cost, and the operation of the compressor, the noise caused by the compression of the liquid refrigerant, oil is not generated and damage to the compressor is also prevented.

In addition, since the driving unit is lubricated by the oil stored in the compressor cylinder and the oil temporarily stored in the suction chamber when the compressor is stopped, the durability of the driving unit may be improved.

Claims (2)

A muffler which is formed in the compressor housing and has spaces formed therebetween with partitions therebetween, the suction holes and discharge holes communicating with the cylinders on one side of the bottom of each space; A manifold coupled to an upper portion of the muffler to form a suction chamber and a discharge chamber by a space communicating with the muffler, and having a suction hole connected to the evaporator side and a discharge hole connected to the condenser side; A pair of first partition walls which are respectively formed adjacent to the muffler side suction holes and the discharge holes of the suction chamber and the discharge chamber to partition respective spaces of the muffler; A pair of second partition walls each partitioning the suction chamber and the discharge chamber into two flow paths by partitioning respective spaces of the manifold corresponding to the first partition walls and having refrigerant flow holes formed at predetermined heights; And, And a pair of third partition walls formed in the manifold to form a first channel of the suction chamber connected to the suction hole and the discharge hole of the manifold and a first channel of the discharge chamber in a substantially U shape. And a liquid refrigerant and oil are filled in the U-shaped flow path when the operation of the compressor is stopped. The structure of claim 1, wherein the refrigerant flow hole inclines downward toward the suction hole / discharge hole side of the compressor cylinder.