KR20040082457A - Heat exchanging accumulator - Google Patents

Abstract

PURPOSE: A heat exchange accumulator is provided to reduce the manufacturing cost by separating gas and liquid while exchanging heat at the same time. CONSTITUTION: A heat exchange accumulator includes a body cylinder(10), an upper cap(20) combined with an upper part of the body cylinder, a lower cap(30) combined with a lower part of the body cylinder, and a high pressure side refrigerant pipe(40) contained in the body cylinder. A low pressure side refrigerant inlet pipe(21) is combined with the upper cap, and a low pressure side refrigerant outflow pipe(31) is combined wit the lower cap, wherein one end(32) of the low pressure side refrigerant outflow pipe is extended to the inside of the body cylinder. The high pressure side refrigerant pipe is formed by winding a refrigerant tube(41) several times. A low pressure side refrigerant flowed into through the low pressure side refrigerant inlet pipe flows downward in association with the refrigerant tube of the high pressure side refrigerant pipe, exchanging heat with a high pressure side refrigerant flowing in the refrigerant tube. Only gaseous refrigerant among the low pressure side refrigerant accumulated at a bottom of an accumulator is moved out through the low pressure side refrigerant outflow pipe.

Description

Heat exchange accumulator {HEAT EXCHANGING ACCUMULATOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange accumulator, and more particularly, to a heat exchange accumulator having a structure in which gas-liquid separation of a refrigerant is performed simultaneously with heat exchange.

In general, in an air conditioner for cooling, a refrigerant circulates a refrigeration cycle circulating a compressor, a condenser, an expansion valve, and an evaporator, and supercritical the refrigeration cycle compressed by the compressor to a supercritical state exceeding a threshold state. It is called a refrigeration cycle.

In the supercritical refrigeration cycle, since the phase change does not occur in the process of radiating heat into the atmosphere after the refrigerant is compressed, the heat radiating device at this time is called a gas cooler instead of a condenser.

1 is a p-h diagram of a supercritical refrigeration cycle. As shown in Figure 1, the basic refrigeration cycle is cycled 1 → 2 → 3 → 4, the cooling effect is determined according to the enthalpy difference (Δh1) of the process 4 → 1 evaporation process.

In order to improve the cooling performance of such a supercritical refrigeration cycle, a heat exchanger for heat exchange may be installed between the refrigerant entering the compressor and the refrigerant coming out of the condenser.

At this time, the refrigerating cycle is circulated from 1 '→ 2' → 3 '→ 4', and the cooling performance becomes enthalpy difference (△ h2) of 4 '→ 1 process, which is higher than the enthalpy difference (△ h1). .

In addition, the accumulator may further include an accumulator for sending only a gaseous refrigerant to the compressor in order to improve compression performance.

2 is a system diagram of a conventional supercritical refrigeration cycle in which a heat exchanger and an accumulator are installed as described above.

As shown, a conventional supercritical refrigeration cycle is provided with an accumulator for separating gas liquid from a refrigerant from an evaporator, and a heat exchanger for exchanging heat between a refrigerant from a gas cooler and a refrigerant from an accumulator.

In the conventional air conditioning apparatus for implementing a supercritical refrigeration cycle, as shown in FIG. 2, when the accumulator separating gas and the heat exchanger for heat exchange are installed as separate parts, the manufacturing cost increases and There was a problem that the configuration is complicated.

In addition, Japanese Patent Application Laid-Open No. 1998-019421 discloses a heat exchange accumulator in which the accumulator and the heat exchanger are implemented as one component, but the heat exchange accumulator has a problem of inferior heat exchange efficiency and is included in the refrigerant. Since the lubricated oil accumulates inside the heat exchange accumulator and does not flow into the compressor, there is a case where the efficiency of the compressor decreases or a failure such as seizing occurs.

The present invention has been made in order to solve the above problems, it is possible to separate the gas-liquid and heat exchange at the same time to reduce the manufacturing cost, simplify the configuration of the pipe, excellent heat exchange efficiency, the lubricating oil accumulated in the heat exchange accumulator It is an object of the present invention to provide a heat exchange accumulator having a structure in which is properly supplied to a compressor.

1 is a p-h diagram of a supercritical refrigeration cycle.

2 is a system diagram of a conventional supercritical refrigeration cycle.

3 is a side cross-sectional view of a heat exchange accumulator according to the present invention.

Fig. 4A is a plan view of the circular baffle of Fig. 3, and Fig. 4B is a sectional view taken along line A-A of Fig. 4A.

Fig. 5A is a side cross-sectional view of the dotted line in Fig. 1, and Fig. 5B is a perspective view of the strainer.

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

10 ... Body Cylinder, 20 ... Upper Cap,

21 ... low pressure refrigerant inlet pipe, 30 ... lower cap,

31 ... low pressure refrigerant pipe, 40 high pressure refrigerant pipe,

41 refrigerant tube, 42 small diameter,

43 ... large neck, 50 ... round baffle,

51 ... spilled groove, 60 ... cylindrical baffle,

70 ... lubricant supply, 71 ... recess,

72 ... Lube hole, 73 ... Strainer.

In order to achieve the above object, a heat exchange accumulator according to the present invention,

Body cylinders; An upper cap coupled to an upper portion of the body cylinder; A lower cap coupled to the lower portion of the body cylinder; It includes a high-pressure side refrigerant pipe accommodated in the body cylinder,

A low pressure side refrigerant inlet pipe is coupled to the upper cap, and a low pressure side refrigerant outlet pipe is installed at the lower cap such that one end thereof extends into the body cylinder, and the high pressure side refrigerant pipe is formed by winding a refrigerant tube several times. Became,

The low pressure side refrigerant introduced through the low pressure side refrigerant inlet pipe exchanges heat with the high pressure side refrigerant flowing inside the refrigerant tube while flowing downward along the refrigerant tube of the high pressure side refrigerant pipe, Among the accumulated low pressure side refrigerants, only gaseous refrigerants are discharged through the low pressure side refrigerant outlet pipe.

The high-pressure side refrigerant pipe is characterized in that the refrigerant tube is wound in a double direction in a spiral direction to form a small diameter portion having a small diameter and a large diameter portion having a large diameter.

In addition, it is preferable that a cylindrical baffle having an open lower portion in the vertical direction is installed at the center of the high-pressure side refrigerant pipe.

In addition, a circular baffle is interposed between the upper cap and the body housing, and a plurality of outflow grooves are formed in the round baffle, and the outflow grooves are formed to be inclined, between the small diameter portion and the large diameter portion of the high-pressure side refrigerant pipe. It is preferably formed to be located.

In addition, the low-pressure side refrigerant outflow pipe coupled to the lower cap, the recess formed on the outer periphery of the outflow pipe; A lubricating oil supply part including at least one lubricating oil hole formed in the outflow pipe corresponding to the recess is formed,

Preferably, the recess is provided with a strainer on which a mesh is formed.

Hereinafter, with reference to the drawings will be described in detail an embodiment of the heat exchange accumulator according to the present invention.

3 is a side cross-sectional view of the heat exchange accumulator according to the present invention, FIG. 4 is a plan view and a side cross-sectional view of the circular baffle of FIG. 3, and FIG. 5 is a cross-sectional view and a perspective view of a strainer of FIG.

The heat exchange accumulator according to the present invention, as shown in Figure 3, the body cylinder 10, the upper cap 20 is coupled to the upper portion of the body cylinder 10; A lower cap 30 coupled to the lower portion of the body cylinder 10; And a high pressure side refrigerant pipe 40 accommodated in the body cylinder 10.

The upper cap 20 is coupled to the body cylinder 10 by means of welding or the like, and a lower pressure refrigerant inlet pipe 21 through which a refrigerant from a low pressure side, that is, a refrigerant from an evaporator, is introduced thereon. It is coupled to communicate with the interior of the (20).

In addition, the lower cap 30 is also coupled to the body cylinder 10 by means of welding or the like, and a lower pressure side refrigerant outflow pipe 31 through which the refrigerant from the low pressure side flows out of the lower cap 30. Combined to communicate internally One end portion 32 of the low pressure side refrigerant outlet pipe 31 is installed to extend to the inside of the body cylinder 10, as shown in FIG. Allow outflow through.

Inside the high-pressure side refrigerant pipe 40, a high-pressure side refrigerant, that is, a refrigerant passing through the gas cooler flows. The high-pressure side refrigerant pipe 40, as shown in Figure 3, the refrigerant tube 41 is It is wound up several times and formed. That is, the refrigerant tube 41 is wound in a double direction in a spiral direction to form a small diameter portion 42 having a small diameter and a large diameter portion 43 having a large diameter, and the refrigerant tube 41 is wound to form a high pressure side. The heat exchange length in which the refrigerant exchanges heat with the refrigerant on the low pressure side is extended, thereby increasing the heat exchange efficiency. Here, the small diameter portion 42 and the large diameter portion 43 are spaced by a predetermined distance to form a space.

3 shows that the refrigerant tube 41 is wound in two, but may be wound in one row or wound in three or more rows.

In addition, a circular baffle 50 is interposed between the upper cap 20 and the body housing 10, and the circular baffle 50 has a plurality of outflow grooves (four in FIG. 4A) in the circumferential direction. 51) is formed.

The circular baffle 50 cuts off between the upper cap 20 and the body cylinder 10, and the refrigerant flowing into the upper cap 20 through the low pressure refrigerant inlet pipe 21 is discharged into the outlet 51. Through the body cylinder 10 to be introduced.

The outflow groove 51 is preferably formed to be inclined, as shown in Figure 4 (b), the outflow groove 51 is a spiral movement of the refrigerant on the low pressure side flowed into the upper cap 20 By allowing it to flow into the interior of the body cylinder 10, it helps to flow along the refrigerant tube 41 of the high-pressure side refrigerant pipe 40 wound in a spiral direction.

As shown in FIG. 3, the outlet groove 51 is preferably formed between the small diameter portion 42 and the large diameter portion 43 of the high-pressure side refrigerant pipe 40. The low pressure side refrigerant flowing out through the 51) flows in the space between the small diameter portion 42 and the large diameter portion 43 to increase the heat exchange area.

In addition, it is preferable that the cylindrical baffle 60 is additionally installed inside the high-pressure side refrigerant pipe 40. The cylindrical baffle 60 is a cylindrical pipe formed so that its lower part is opened, and an upper end thereof is installed to contact the lower surface of the circular baffle 50.

The cylindrical baffle 60 prevents the low pressure side refrigerant flowing along the refrigerant tube 41 of the high pressure side refrigerant pipe 40 from penetrating into the center of the high pressure side refrigerant pipe 40 and falling down, thereby reducing the low pressure side. The refrigerant is allowed to undergo sufficient heat exchange along the high pressure side refrigerant pipe (40).

In the low pressure side refrigerant outlet pipe 31 positioned below the lower cap 30, a lubricating oil supply part 70 is formed as shown by a dotted line, and the lubricating oil supply part 70 is configured to store the lubricating oil in order to store the lubricating oil. Lubricating oil holes 72 of one or more (only one in FIG. 5) formed in the recess 71 formed by recessing a part of the 31 inwardly and the outflow pipe 31 corresponding to the recess 71. ) (See Fig. 5 (a)).

In addition, a strainer 73 having a mesh is formed on the outer circumference of the concave portion 71 (see FIG. 5 (b)), and the strainer 73 is in the lubricant oil flowing into the lubricant oil hole 71. While blocking the foreign matter, the concave portion 71 is covered so that the lubricant is stored in the space formed by the concave portion 71 and the strainer 73.

The lubricating oil supply unit 70 supplies lubricating oil to the low pressure side refrigerant flowing into the compressor so that the compressor is smoothly driven.

Referring to the operation of the above embodiment, the low pressure side refrigerant flows into the upper cap 20 through the low pressure side inlet pipe 21, while the high pressure side refrigerant flows into the high pressure side refrigerant pipe 40. It flows into the tube 41.

The low pressure refrigerant introduced into the upper cap 10 is introduced into the body cylinder 10 through the outflow groove 51 of the circular baffle 50 to cool the refrigerant tube 41 of the high pressure refrigerant tube 40. As a result, they flow in a spiral direction. At this time, the inclined shape of the outflow groove 51 induces a spiral motion of the low pressure side refrigerant.

The low pressure side refrigerant flowing spirally along the refrigerant tube 41 is heat-exchanged with the high pressure side refrigerant flowing in the refrigerant tube 41, and during this process, the low pressure side refrigerant is mostly vaporized. At this time, the cylindrical baffle 60 prevents the low pressure side refrigerant from seeping into the center before reaching the lower portion of the high pressure side refrigerant pipe 40 so that effective heat exchange is achieved.

The low pressure refrigerant reaching the lower portion of the high pressure refrigerant pipe 40 accumulates on the upper surface of the lower cap 30, and the lubricant oil in the refrigerant accumulates at the lowermost portion due to the difference in specific gravity.

The gas component of the accumulated low pressure side refrigerant flows out through one end 32 of the low pressure side outlet pipe 31, and at this time, lubricant oil is supplied to the low pressure side refrigerant flowing out through the lubricating oil hole 72 of the lubricating oil supply unit 70. Can be supplied.

According to the heat exchange accumulator according to the present invention, the gas-liquid separation can be performed simultaneously with the heat exchange, thereby reducing the manufacturing cost and simplifying the construction of the pipe.

In addition, the heat exchange length between the high pressure refrigerant and the low pressure refrigerant is increased, so that the heat exchange efficiency is excellent, and the lubricating oil accumulated in the heat exchange accumulator is supplied to the low pressure refrigerant that flows out to lubricate the compressor properly.

Claims (8)

A body cylinder 10; An upper cap 20 coupled to an upper portion of the body cylinder 10; A lower cap 30 coupled to the lower portion of the body cylinder 10; In the heat exchange accumulator (Accumulator) comprising a high-pressure side refrigerant pipe 40 accommodated in the body cylinder 10, The low pressure side refrigerant inlet pipe 21 is coupled to the upper cap 20, and the low pressure side refrigerant outlet pipe 31 is connected to the lower cap 30 at one end 32 of the body cylinder 10. It is installed to extend to, the high-pressure side refrigerant pipe 40 is formed by winding the refrigerant tube 41 several times, The low pressure side refrigerant introduced through the low pressure side refrigerant inlet pipe 21 flows downward along the refrigerant tube 41 of the high pressure side refrigerant pipe 40 and flows inside the refrigerant tube 41. And a gaseous refrigerant of the low pressure side refrigerant accumulated in the lower portion of the accumulator is discharged through the low pressure side refrigerant outlet pipe (31). The method of claim 1, The high-pressure side refrigerant pipe 40, the refrigerant tube 41 is wound in a double direction in a spiral direction to form a small diameter portion 42 having a small diameter and a large diameter portion 43 having a large diameter Raider. The method of claim 1, A heat exchange accumulator, characterized in that a circular baffle (50) is interposed between the upper cap (20) and the body housing (30), and a plurality of outlet grooves (51) are formed in the circular baffle (50). . The method of claim 1, Heat exchange accumulator, characterized in that the center of the high-pressure side refrigerant pipe (40) is provided with a cylindrical baffle (60), the lower portion of which is opened in the vertical direction. The method of claim 3, The outflow groove 51 is heat exchange accumulator, characterized in that formed to be inclined. The method of claim 3, The outflow groove 51 is formed to be located between the small diameter portion 42 and the large diameter portion 43 of the high-pressure side refrigerant pipe (40). The method of claim 1, The low pressure side refrigerant outflow pipe 31 coupled to the lower cap 30 includes a recess 71 formed on an outer circumference of the outflow pipe 31; And a lubricating oil supply part (70) comprising at least one lubricating oil hole (72) formed in the outflow pipe (31) corresponding to the recess (71). The method of claim 6, The recess 71 is provided with a strainer 73 having a mesh formed therein.