Device for separating oil from a refrigerant fluid

Abstract

A device for separation of oil particles by a coolant for air conditioning systems comprises a hollow container body and an inlet arranged to make enter the hollow container body a coolant, with oil particles, mainly in liquid phase and have a temperature T.sub.1. The device also comprises a outlet located upper part of the hollow container body and arranged to cause protrude coolant regenerated in vapour phase by the hollow container body. is also provided a heating coil arranged in the hollow container body and containing fluid at a temperature T.sub.2>>T.sub.1, in such a way that the coolant evaporates when comes in contact with the heating coil and the oil particles rimangano instead on the bottom of the hollow container body. The device also comprises a first oil barrier arranged above with respect to the heating coil and arranged to avoid that the oil particles schizino towards the outlet. is also provided a second oil barrier 114 located in the hollow container body at the outlet, said second oil barrier comprising holes having a diameter of a predetermined value D configured for preventing to oil particles of larger diameter to the predetermined value D of crossing the outlet.

Claims

1. A device for separation of oil particles by a coolant for air conditioning systems, said device comprising: a hollow container body defined by a top wall and a bottom wall; an inlet arranged to let enter said hollow container body a coolant with oil particles, said coolant being mainly in liquid phase and having a temperature T.sub.1; an outlet located at said top wall and arranged to cause regenerated coolant in vapor phase to exit from said hollow container body; a heating unit, in said hollow container body, arranged to heat said coolant at a temperature T.sub.2>>T.sub.1, in such a way that said coolant evaporates when it comes in contact with said heating unit and said oil particles can fall towards said bottom wall; a first oil barrier located between said heating unit and said outlet and arranged to prevent said oil particles to splash towards said outlet, said first oil barrier arranged at a distance L from said top wall; said device characterized in that it also comprises a second oil barrier located in said hollow container body at said outlet, said second oil barrier comprising holes having a diameter of a predetermined value D, configured to prevent that oil particles having diameter larger than said predetermined value D pass through said outlet.

2. The device, according to claim 1, wherein, at said outlet, a labyrinth is provided configured to allow said coolant in vapor phase to pass through, in order to reduce the liquid component of oil that reaches said outlet.

3. The device, according to claim 1, wherein said heating unit is a heating coil extending within said hollow container body and arranged to contain fluid at a temperature T.sub.2>>T.sub.1, in such a way that said coolant evaporates when it comes in contact with said heating coil.

4. The device, according to claim 3, wherein said first oil barrier comprises lateral slots arranged to allow inlet and outlet branches of said heating coil to cross said first oil barrier.

5. The device, according to claim 1, wherein upstream of said inlet a cylindrical chamber is provided arranged to provide a pre-expansion of the coolant delivered to said hollow container body for lowering the flow speed and avoiding a coolant nebulization that would cause the oil particles to rise towards said outlet.

6. The device, according to claim 5, wherein said cylindrical chamber is connected to said top wall and is arranged to support said first oil barrier at said distance L from said top wall.

7. The device, according to claim 1, wherein in said hollow container body a pressure transducer is provided arranged to monitor the pressure in said hollow container body.

8. The device, according to claim 1, wherein said top wall and said bottom wall are formed, respectively, by an upper flange and a lower flange, through said upper flange passing said coolant entering and exiting from said hollow container body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further characteristic and/or advantages of the present invention are more bright with the following description of an exemplary embodiment thereof, exemplifying but not limitative, with reference to the attached drawings in which:

(2) FIG. 1 shows schematically a first exemplary embodiment of the present invention;

(3) FIG. 2 shows, in perspective, an exemplary embodiment of the present invention where it is shown the outside of the hollow container body defined by the two flanges;

(4) FIG. 3 shows, in perspective, the inner content of the hollow container body of the exemplary embodiment of FIG. 1.

DESCRIPTION OF A PREFERRED EXEMPLARY EMBODIMENT

(5) With reference to FIG. 1, in an exemplary embodiment of the present invention, the device 100 for separation of oil particles by a coolant for air conditioning systems comprises a hollow container body 110 inside which coolant to be regenerated is injected through an inlet 111. The entering fluid, containing oil particles and other impurities, is mainly in liquid phase and has a temperature T.sub.1.

(6) In the hollow container body 110 there is a heating coil 120 wherein fluid, for example fluid already regenerated, flows at a temperature T.sub.2>>T.sub.1. The heating coil 120 is located in the lower part of the hollow container body 110, in such a way that the coolant to regenerate, mainly in liquid phase, depositing on the bottom by gravity, enters in contact with it. Due to the heat exchange between fluid and heating coil 120, the coolant evaporates, leaving on the bottom oil particles and any other impurities that have a higher evaporation temperature. The regenerated fluid in vapor phase rises then towards the upper part of the hollow container body 110 and exits through the outlet 112, due the suction of an external compressor.

(7) The present invention also provides a first oil barrier 130, placed between the heating coil 120 and the outlet 112, at a distance L by the top wall of the hollow container body 110, arranged to protect the outlet 112 itself from oil particles that, for example, it can splash upwards while heating the coolant. In particular, between the first oil barrier 130 and the side wall of the hollow container body 110 there is at least one rise way 10 arranged to allow the coolant in vapor phase to pass through in order to reach the outlet 112.

(8) Furthermore, the present invention provides a second oil barrier 114 located in the hollow container body 110 at the outlet 112. Such second oil barrier 114 comprises holes 115 having a diameter of a predetermined value D configured to prevent oil particles having diameter larger than this predetermined value D to cross the outlet 112.

(9) This way, owing to the barrier 130 and 114 it is practically cleared the contamination of regenerated coolant by oil particles, thus increasing the efficiency of the regenerating process of the fluid and increasing the quality of the final product with respect to the prior art.

(10) In the exemplary embodiment of FIG. 3, the first oil barrier 130 comprises lateral slots 135 that allow to the heating coil 120 to cross the barrier itself. Such lateral slots 135 can also replace the rise way 10 in order to allow the passage of coolant in vapor phase towards the outlet 112, while retaining a large part of the oil particles on the surface of the barrier 130.

(11) Alternatively, lateral slots 135 can be closed at the ends, allowing the passage of coolant in vapor phase only by the rise way 10.

(12) In the exemplary embodiment of FIG. 3, the inlet 111 is located below the first oil barrier 130 and the entering coolant passes first through a cylindrical chamber 113 arranged to provide a pre-expansion of the fluid itself in order to decrease the speed of inlet in the hollow container body 110. This way, you avoid the nebulization of the coolant that could assist the rise of oil particles towards the outlet 112. Furthermore, the cylindrical chamber 113 can also serve as a spacer to maintain the barrier 130 at the distance L by the top wall of the hollow container body 110.

(13) The foregoing description some exemplary specific embodiments will so fully reveal the invention according to the conceptual point of view, so that others, by applying current knowledge, will be able to modify and/or adapt in various applications the specific exemplary embodiments without further research and without parting from the invention, and, accordingly, it is meant that such adaptations and modifications will have to be considered as equivalent to the specific embodiments. The means and the materials to realize the different functions described herein could have a different nature without, for this reason, departing from the field of the invention. It is to be understood that the phraseology or terminology that is employed herein is for the purpose of description and not of limitation.