JP4186343B2 - Oil separator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil separator that separates refrigeration oil from refrigerant mixed with refrigeration oil.
[0002]
[Prior art]
In the conventional oil separator, as shown in the sectional view of FIG. 4, the high-pressure refrigerant vapor mixed with the refrigeration oil flowing into the container 8 from the inlet pipe 9 collides with the separation plate 11 to deposit oil droplets. The refrigerant mixed with oil droplets that could not be separated here is introduced into the lower space 13 of the container 8 from the passage hole 14 formed in the separation plate 11. Since the outlet pipe 17 protruding from the bottom surface of the container 8 is covered with the cover 21, the refrigerant that has flowed into the lower space 13 cannot flow directly into the outlet pipe 17, but is reversed after flowing down to the cover. The refrigerant flows into the outlet pipe 17 so as to wrap around from below, and at the time of this reversal, the refrigeration oil having a higher density than the refrigerant is further separated.
However, in the above configuration, the separation process of the refrigeration oil is small, the passage area of the passage hole 14 is large, and the number of holes is small. Therefore, the amount of refrigerant passing through each passage hole (including the refrigeration oil) is large, and the refrigerant is There was a problem that the oil could not be separated after passing through the passage hole.
[0003]
[Problems to be solved by the invention]
In view of the above problems, an object of the present invention is to provide an oil separator that can increase the separation process of refrigerating machine oil and more reliably perform refrigerating machine oil separation.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention includes an inlet pipe into which a refrigerant mixed with refrigerating machine oil flows from above into a container, the container is partitioned vertically below the inlet pipe, and outside the center of the container. In an oil separator comprising a separation plate having a plurality of passage holes, protruding from the bottom of the container and opening in the vicinity of the separation plate, and having an outlet pipe for allowing the refrigerant to flow out of the container,
A throttle part is provided at the tip of the inlet pipe, a through hole is provided on the outer periphery of the upper part of the throttle part, and the lower surface of the separation plate protrudes downward from the container center side of the passage hole so as to cover the passage hole. An elongate body is provided that protrudes in the direction of the side wall of the container, and the refrigerant that has passed through the passage hole is guided in the direction of the side wall of the container.
[0005]
Also, the inclination angle of the Hisashi body is set to 45 ° or less.
[0006]
Further, side walls are provided on both sides of the sheep body, and both sides are closed.
[0007]
Further, the separation plate is made of sheet metal, and the Hisashi body is integrally formed with the separation plate by drawing.
[0008]
Further, the plurality of passage holes are provided on the same circumference in the radial direction of the separation plate.
[0009]
Further, the plurality of passage holes are radially provided on two rows in the radial direction of the separation plate.
[0010]
Further, a plurality of the through holes are provided.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention will be described with reference to the embodiment of the present invention shown in FIGS.
As shown in the refrigerant circuit diagram of the air conditioner for cooling only in FIG. 1, 1 is a compressor that compresses refrigerant vapor, and 2 is a refrigerant oil that is separated from refrigerant vapor mixed with the refrigerant oil discharged from the compressor 1. In the oil separator, the refrigerating machine oil separated from the refrigerant by the oil return pipe 3 is returned to the compressor 1.
4 is an outdoor heat exchanger that is installed outdoors and exchanges heat with the outside air, 5 is a capillary tube through which the refrigerant passes and adiabatically expands, and 6 is installed indoors and performs heat exchange of the refrigerant with room air. An indoor heat exchanger 7 is an accumulator that regulates the amount of liquid back to the compressor 1.
[0012]
The high-temperature and high-pressure refrigerant vapor mixed with the refrigerating machine oil discharged from the compressor 1 is separated from the refrigerating machine oil by the oil separator 2, and the separated refrigerating machine oil returns to the compressor 1 through the oil return pipe 3. The high-temperature and high-pressure refrigerant vapor is sent to the outdoor heat exchanger 4 and dissipates heat to the outside air to condense and become a high-temperature and high-pressure refrigerant liquid. The high-temperature and high-pressure refrigerant liquid adiabatically expands in the capillary tube 5. The low-temperature and low-pressure refrigerant liquid is absorbed by the indoor heat exchanger 6 from the indoor air, and is cooled to evaporate into low-temperature and low-pressure refrigerant vapor. The refrigerant liquid to be separated is separated by the accumulator 7 and returned to the suction side of the compressor 1.
[0013]
First, the first embodiment shown in the sectional view of the oil separator in FIG. 2 will be described.
8 is a cylindrical container, 9 is an inlet pipe that protrudes into the container 8 from above the container 8 and into which the refrigerant flows. A throttle part 9a is provided at the tip of the inlet pipe 9, and an upper part of the throttle part 9a. A plurality of through holes 9 b are provided on the outer periphery of the inlet pipe 9.
11 divides the container 8 vertically into an upper space 12 and a lower space 13 below the inlet pipe 9, and a plurality of passage holes 14 through which the refrigerant passes radially on the same circumference in two rows in the radial direction. Is a separation plate formed.
The passage hole 14 has a relatively small diameter and a large number.
[0014]
15 protrudes downward from the container center side of the passage hole 14 on the lower surface of the separation plate 11, and its tip is bent in an L shape to cover the lower side of the passage hole 14 toward the side wall 10 of the container 8. In addition, the body has a tip that protrudes downward at an angle of 45 ° or less with respect to the horizontal, and side walls 16 are provided on both sides of the body 15.
Reference numeral 17 denotes an outlet pipe that protrudes from the bottom surface of the container 8 and that opens in the vicinity of the separation plate 11 and flows out from the container 8.
The oil return pipe 3 opened at the bottom of the container 8 returns the refrigeration oil stored at the bottom of the container 8 to the compressor 1.
[0015]
Next, the operation of the above configuration will be described.
Refrigerating machine oil that has flowed into the container 8 from the inlet pipe 9 by providing a throttle part 9a at the tip of the inlet pipe 9 and providing a plurality of through holes 9b on the outer periphery of the inlet pipe 9 above the throttle part 9a. The high-temperature and high-pressure refrigerant vapor mixed with is collided with the separation plate 11 by the throttle portion 9a and can promote the precipitation of oil droplets. By colliding with the side wall 10 of the upper space 12 of the container 8, oil droplets of the refrigerating machine oil are deposited. The deposited oil droplets travel along the side wall 10 of the container 8, pass through the passage hole 14, and refrigerating machine oil is stored at the bottom of the container 8.
[0016]
The high-temperature and high-pressure refrigerant vapor remaining in the refrigerating machine oil that has collided with the side wall 10 of the container 8 passes through the passage hole 14 and collides with the elongate body 15, so that oil droplets are deposited here as well. Refrigerating machine oil is stored at the bottom of the container 8.
The high-temperature and high-pressure refrigerant vapor remaining in the refrigerating machine oil that has collided with the body 15 is led to the body 15 and collides with the side wall 10 of the lower space 13 of the container 8, thereby precipitating oil droplets. Refrigerator oil is stored at the bottom of the container 8 in the same manner as described above.
[0017]
The high-temperature and high-pressure refrigerant vapor in which the refrigerating machine oil guided obliquely downward by the elongate body 15 flows down the lower space 13 of the container 8 and then reverses and flows into the outlet pipe 17 so as to wrap around from below. , And sent to the outdoor heat exchanger 4. At the time of this reversal, the refrigerating machine oil having a density higher than that of the refrigerant is further separated by gravity and centrifugal force and stored in the bottom of the container 8.
The refrigerating machine oil stored in the bottom of the container 8 as described above is returned to the compressor 1 through the oil return pipe 3.
As described above, the refrigerating machine oil separation process is performed in multiple stages as described above, and the refrigerating machine oil can be more reliably separated by increasing the number of passage holes 14.
[0018]
Further, by forming the inclination angle of the corpse body 15 so that the tip thereof is inclined downward at an angle of 45 ° or less with respect to the horizontal, the refrigerant colliding with the side wall 10 of the container 8 is obliquely below the lower space 13. Since the flow rate of the refrigerant in the downward direction increases and the centrifugal force at the time of inversion increases, the precipitation of oil droplets is further promoted.
On the other hand, when the inclination angle is increased, the collision with the side wall 10 of the container 8 is performed obliquely, so that the collision force is weakened and oil droplets are not deposited due to the collision.
Therefore, it is necessary to set an appropriate value for the inclination angle of the elongate body 15 so that the precipitation of oil droplets due to the centrifugal force and the collision force is increased overall.
In general, when a change in velocity due to a collision force is compared with a change in vector velocity due to a centrifugal force, the change in velocity due to the collision force is greater.
Accordingly, it is considered that the inclination angle of the corpse body 15 should be 45 ° or less at which the lateral speed and the downward speed are equal.
[0019]
By providing side walls 16 on both sides of the body 15 and closing both sides, the refrigerant that has collided with the body 15 is prevented from flowing into the side of the body 15 and entering the outlet pipe 17 as a shortcut. can do.
[0020]
Next, a second embodiment shown in the cross-sectional view of the main part of the separation plate in FIG.
It differs from the first embodiment in the formation method of the Hisashi body and its side wall with respect to the separation plate.
By forming the separator body 11 and the side wall 16 integrally by drawing the separation plate 11 made of sheet metal, the formation of the long body 15 and the side wall 16 is a one-step process, which is extremely inexpensive. Can do.
[0021]
【The invention's effect】
As described above, according to the present invention, by increasing the number of refrigerating machine oil separation processes and increasing the number of passage holes 14, the oil separator can be more reliably separated.
[Brief description of the drawings]
FIG. 1 is a refrigerant circuit diagram of a cooling-only air conditioner equipped with an oil separator on the high-pressure side.
FIG. 2 is a cross-sectional view showing a first embodiment of an oil separator according to the present invention.
FIG. 3 is a cross-sectional view of an essential part of a separation plate portion of a second embodiment of the oil separator according to the present invention.
FIG. 4 is a cross-sectional view of a conventional oil separator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Compressor 2 Oil separator 3 Oil return pipe 4 Outdoor heat exchanger 5 Capillary tube 6 Indoor heat exchanger 7 Accumulator 8 Container 9 Inlet pipe
9a Aperture
9b Through-hole 10 Side wall 11 Separation plate 12 Upper space 13 Lower space 14 Pass-through hole 15 Body 16 Side wall 17 Exit pipe

Claims (4)

An inlet tube for flowing a refrigerant refrigeration oil mixed from above into the container, partition the container up and down to separate refrigerating machine oil from refrigerant discharged from the inlet pipe, a plurality of passage holes from the center to the outside In an oil separator comprising: a separator plate formed with an outlet pipe for allowing a refrigerant separated from the refrigerating machine oil by the separator plate to flow out of the container;
A throttle part is provided at the tip of the inlet pipe, a through hole is provided on the outer periphery of the upper part of the throttle part, and the lower surface of the separation plate protrudes downward from the container center side of the passage hole so as to cover the passage hole. An oil separator is provided, comprising an elongate body that projects in an inclined manner toward the side wall of the container, and guides the refrigerant that has passed through the passage hole toward the side wall of the container. The oil separator according to claim 1, wherein an inclination angle of the elongate body is 45 ° or less. The oil separator according to claim 1 or 2, wherein side walls are provided on both sides of the elongate body and both sides are closed. 4. The oil separator according to claim 1, wherein the oil separation plate is made of sheet metal, and the elongate body is formed integrally with the oil separation plate by drawing. 5.

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