JP2013108710A - Gas liquid separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas liquid separator capable of effectively preventing a strainer from clogging due to foreign matter and reliably returning oil to a compressor.SOLUTION: A gas liquid separator 1 has a cylindrical body 2 one end of which is open, a header 3 which seals an open end of the body and in which a refrigerant inflow hole 3d and a refrigerant outflow hole 3e are bored, a refrigerant ejection pipe 5 one end of which is connected to the refrigerant outflow hole and the other end of which is located near the bottom 2a of the body in the body, a refrigerant suction pipe 4 which surround the refrigerant ejection pipe an end of a header side of which is open, and in which an oil return hole 4a is formed at an end of the bottom side of the body, and the strainer 6 interposed between the oil return hole formed in the refrigerant suction pipe and the inside of the body and is characterized in that the body bottom side end of the refrigerant suction pipe protrudes to the body bottom side while being surrounded by the strainer, and the oil return hole is formed in the distal end of the same.

Description

  The present invention relates to a gas-liquid separator, and more particularly to a gas-liquid separator that separates and stores a refrigerant or the like circulating through a refrigeration cycle.

  As an example of the gas-liquid separator, Patent Document 1 discloses a housing, an introduction port that opens to an upper portion of the housing and introduces a gas-liquid two-phase fluid into the housing, and an opening that opens to an upper surface of the housing. A lead-out port for leading out the gas phase fluid to the outside, a pipe part disposed in the vertical direction in the housing, having a lower end opened below the housing, and an upper end connected to the lead-out port, and the pipe part A cap portion formed on the upper side and colliding with the introduction fluid with a side surface facing the introduction port; an outer periphery of the tube portion is disposed and a bottom portion is fixed to a bottom surface of the housing; A gas-liquid separator having a double tube structure including an outer tube body that opens in a section is disclosed.

  Further, as a gas-liquid separator having the same structure as the gas-liquid separator, as shown in FIG. 3, a bottomed cylindrical body 22 and a header 23 for sealing the upper opening end of the body 22, A cylindrical refrigerant discharge pipe 25 disposed inside the body 22, a refrigerant suction pipe 24 surrounding the refrigerant discharge pipe 25, and an oil return hole 24 a formed at the lower end of the refrigerant suction pipe 24 are surrounded. A gas-liquid separator including a strainer 26 disposed on the bottom surface 22a of the body 22 and a cup-shaped gas-liquid separation member 27 that opens downward is used.

  In the gas-liquid separator 21, the refrigerant that has flowed into the body 22 from the evaporator or the like through the refrigerant inflow hole 23d of the header 23 is gas-liquid separated by the gas-liquid separation member 27, and the separated liquid refrigerant, and Compressor oil contained in the refrigerant (compressor lubricating oil, hereinafter referred to as “oil”) moves straight down and is stored in the fuselage 22. Thereafter, separation between the liquid refrigerant L and the oil proceeds, and the oil accumulates below the liquid refrigerant L.

  On the other hand, the gas refrigerant moves upward before joining the liquid refrigerant L inside the fuselage 22, enters the refrigerant suction pipe 24 from the upper opening of the refrigerant suction pipe 24, and the inner peripheral surface of the refrigerant suction pipe 24. And the outer peripheral surface of the refrigerant discharge pipe 25, once reaches the lower end of the refrigerant suction pipe 24, and turns upward while sucking the oil accumulated below the liquid refrigerant L from the oil return hole 24a. The inside of the discharge pipe 25 rises, and the gas refrigerant containing oil is discharged from the refrigerant outflow hole 23e of the header 23 and returned to the compressor. In addition, the foreign matter contained in the refrigerant reaches the bottom of the body 22 through the same route as the liquid refrigerant and is caught by the strainer 26 to prevent the foreign matter from entering the compressor.

Japanese Utility Model Publication No. 57-2371

  However, in the conventional gas-liquid separator 21, the strainer 26 prevents foreign matter from entering the compressor. However, when used for a long time, the strainer 26 may be clogged by the foreign matter. Further, when the area of the strainer 26 is increased in order to make the strainer 26 less likely to be clogged, the distance T between the oil return hole 24 a and the bottom surface 22 a becomes longer, and the liquid level of the oil accumulated at the bottom of the body 22 is increased. Is low, it is difficult for the oil to be sucked from the oil return hole 24a, and it may be difficult to return the oil to the compressor.

  Therefore, the present invention has been made in view of the above problems in the conventional gas-liquid separator, and can effectively prevent clogging of the strainer due to foreign matters and reliably return the oil to the compressor. An object of the present invention is to provide a gas-liquid separator that can be used.

  In order to achieve the above object, the present invention provides a gas-liquid separator, wherein a cylindrical body having one end opened, the opening end of the body being sealed, and a refrigerant inflow hole and a refrigerant outflow hole are formed. An inner end of the fuselage, and one end of which is connected to the refrigerant outflow hole and the other end is located near the bottom of the fuselage, and surrounds the refrigerant discharge tube, Between the refrigerant suction pipe in which an oil return hole is formed at the end on the bottom side of the fuselage, the oil return hole formed in the refrigerant suction pipe, and the inside of the fuselage. The fuselage bottom side end of the refrigerant suction pipe protrudes toward the fuselage bottom while being surrounded by the strainer, and the oil return hole is formed at the tip. .

  And according to the present invention, the fuselage bottom side end of the refrigerant suction pipe is projected to the fuselage bottom side so as to be surrounded by the strainer, and the oil return hole is formed at the tip thereof, so that the oil in the fuselage Even when the liquid level is relatively low, the oil can be reliably returned to the compressor, the surface area of the strainer can be increased, and the strainer can be effectively prevented from being clogged.

  In the gas-liquid separator, the oil return hole can be formed by drawing an end portion of the refrigerant suction pipe.

  As described above, according to the present invention, it is possible to provide a gas-liquid separator that can effectively prevent clogging of the strainer due to foreign matters and can reliably return oil to the compressor.

It is a figure which shows 1st Embodiment of the gas-liquid separator concerning this invention, Comprising: (a) is sectional drawing, (b) is a strainer of (a), and the enlarged view of the vicinity. It is a figure which shows 2nd Embodiment of the gas-liquid separator concerning this invention, Comprising: It is sectional drawing equivalent to FIG.1 (b). It is a figure which shows an example of the conventional gas-liquid separator, Comprising: (a) is sectional drawing, (b) is a strainer of (a), and the enlarged view of the vicinity.

  Next, an embodiment for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a first embodiment of a gas-liquid separator according to the present invention. This gas-liquid separator 1 includes a bottomed cylindrical body 2 and a header 3 that seals the open end of the body 2. And a cylindrical refrigerant discharge pipe 5 disposed inside the body 2, a refrigerant suction pipe 4 surrounding the refrigerant discharge pipe 5, and an oil return hole 4 a formed at the lower end of the refrigerant suction pipe 4. In this way, the strainer 6 is disposed on the bottom surface 2a of the body 2 and the cup-shaped gas-liquid separation member 7 is opened downward.

  The body 2 is made of a metal such as an aluminum alloy, and is formed in a bottle shape having a bottomed cylindrical shape with an upper portion opened. As described above, the upper opening of the body 2 is sealed by the header 3, and the refrigerant suction pipe 4, the refrigerant discharge pipe 5, the strainer 6, and the gas-liquid separation member 7 are accommodated in the body 2.

  The header 3 is made of a metal such as an aluminum alloy, and includes a disc-shaped base 3a, an upper part 3b protruding upward from the base 3a, and a cylindrical lower part 3c protruding downward from the base 3a. The refrigerant inflow hole 3d and the refrigerant outflow hole 3e penetrate vertically. On the upper surface of the upper portion 3b, a female screw portion (not shown) for attaching a pipe that fits the refrigerant inflow hole 3d and the refrigerant outflow hole 3e to the header 3 is screwed.

  The refrigerant discharge pipe 5 is made of a metal such as an aluminum alloy, and is press-fitted and fixed in the refrigerant suction pipe 4 by a rib or the like (not shown) extending in the axial direction inside the refrigerant discharge pipe 4. The upper end portion 5a of the refrigerant discharge pipe 5 is fixed to the lower portion of the refrigerant outflow hole 3e by caulking or the like.

  The refrigerant suction pipe 4 surrounds the refrigerant discharge pipe 5, has an upper end opened, and an oil return hole 4a formed at the lower end. A lower end portion of the refrigerant suction pipe 4 protrudes downward while being surrounded by the strainer 6, and an oil return hole 4 a is formed at the front end portion thereof by drawing.

  The strainer 6 is fixed on the bottom surface 2a of the body 2 so as to surround the lower end portion of the refrigerant suction pipe 4 and the oil return hole 4a.

  Here, as shown in FIG. 1B, when the oil return hole 4a is formed at a height T from the bottom surface 2a as in the conventional gas-liquid separator 21 shown in FIG. It can be seen that the surface area of the strainer 6 can be increased compared to the strainer 26. This is a characteristic part of the present invention, and even when the oil level in the body 2 is relatively low, the oil can be reliably returned to the compressor, and the surface area of the strainer 6 is increased. Clogging of the strainer 6 due to foreign matter in the refrigerant can be effectively prevented.

  The gas-liquid separation member 7 is made of a metal such as an aluminum alloy, and is provided with a protrusion 7 a that is fixed to the lower portion 3 c below the header 3 and protrudes upward on the upper surface.

  Next, operation | movement of the gas-liquid separator 1 which has the said structure is demonstrated, referring FIG. In the following description, the gas-liquid separator 1 is disposed between the evaporator and the compressor of the refrigeration cycle, the refrigerant from the evaporator is separated into liquid refrigerant and gas refrigerant, and the liquid refrigerant is gas-liquid. A case where the gas refrigerant is stored in the separator 1 and the gas refrigerant is returned to the compressor (so-called accumulator) will be described as an example.

  The refrigerant from the evaporator flows into the body 2 from the refrigerant inflow hole 3d of the header 3 in FIG. 1, and then collides with the gas-liquid separation member 7 to be gas-liquid separated. At this time, since the gas-liquid separation member 7 is provided with the protrusions 7 a, the refrigerant is rectified radially and smoothly moves on the upper and side surfaces of the gas-liquid separation member 7. There is no stagnation and the pressure loss can be kept small.

  The liquid refrigerant separated by the gas-liquid separation member 7 and the oil contained in the refrigerant move straight down as they are and are stored in the body 2. Thereafter, separation between the liquid refrigerant L and the oil proceeds, and the oil accumulates below the liquid refrigerant L.

  On the other hand, the gas refrigerant moves upward before joining the liquid refrigerant L inside the body 2, enters the refrigerant suction pipe 4 from the upper opening of the refrigerant suction pipe 4, and the inner peripheral surface of the refrigerant suction pipe 4. And the outer peripheral surface of the refrigerant discharge pipe 5, then reaches the lower end of the refrigerant suction pipe 4, and then turns upward while sucking oil accumulated below the liquid refrigerant L from the oil return hole 4 a. The inside of the discharge pipe 5 rises, and the gas refrigerant containing oil is discharged from the refrigerant outflow hole 3e of the header 3 and returned to the compressor. Further, the foreign matter contained in the refrigerant reaches the bottom of the body 2 through the same route as the liquid refrigerant and is captured by the strainer 6.

  Next, a second embodiment of the gas-liquid separator according to the present invention will be described with reference to FIG.

  The gas-liquid separator 11 includes a refrigerant suction pipe 14 and a strainer 16 having shapes different from those of the refrigerant suction pipe 4 and the strainer 6 of the gas-liquid separator 1 shown in FIG. The same as the separator 1.

  The refrigerant suction pipe 14 surrounds the refrigerant discharge pipe 5, and the upper end portion 14 a opens similarly to the refrigerant suction pipe 4. A lower end portion of the refrigerant suction pipe 14 has a conical shape in the longitudinal section, an outer surface is surrounded by the strainer 16, and an oil return hole 14a is formed at the tip end portion.

  The strainer 16 is fixed on the bottom surface 2a of the body 2 so as to surround the lower end portion of the refrigerant suction pipe 14 and the oil return hole 14a.

  Even with the above configuration, when the oil return hole 14a is formed at a height T from the bottom surface 2a as in the conventional gas-liquid separator 21 shown in FIG. 3, it is compared with the strainer 26 of FIG. The surface area of the strainer 16 can be increased, and even when the oil level inside the fuselage 2 is relatively low, the oil can be reliably returned to the compressor and the surface area of the strainer 16 is increased. Therefore, clogging of the strainer 16 due to foreign matters in the refrigerant can be effectively prevented.

  The shapes of the refrigerant suction pipe and the strainer are not limited to those shown in FIGS. 1 and 2, and the lower end of the refrigerant suction pipe is projected downward in a state surrounded by the strainer, and an oil return hole is formed at the tip thereof. Any shape may be used as long as it is formed.

DESCRIPTION OF SYMBOLS 1 Gas-liquid separator 2 Body 2a Bottom surface 3 Header 3a Base part 3b Upper part 3c Lower part 3d Refrigerant inflow hole 3e Refrigerant outflow hole 4 Refrigerant suction pipe 4a Oil return hole 5 Refrigerant discharge pipe 5a Upper end part 6 Strainer 7 Gas-liquid separation member 7a Protrusion part 11 Gas-liquid separator 14 Refrigerant suction pipe 14a Oil return hole 16 Strainer

Claims (2)

A cylindrical body with one end open;
A header that seals the open end of the body and has a coolant inflow hole and a coolant outflow hole;
Inside the fuselage, one end is connected to the refrigerant outflow hole, and the other end is located near the bottom of the fuselage, a refrigerant discharge pipe,
A refrigerant suction pipe that surrounds the refrigerant discharge pipe, has an end on the header side, and has an oil return hole formed on an end on the bottom side of the body;
A strainer interposed between the oil return hole formed in the refrigerant suction pipe and the inside of the fuselage,
The body bottom side end of the refrigerant suction pipe protrudes toward the body bottom while being surrounded by the strainer, and the oil return hole is formed at the tip of the gas / liquid separator.   The gas-liquid separator according to claim 1, wherein the oil return hole is formed by drawing an end portion of the refrigerant suction pipe.

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