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Title:
REFRIGERANT SYSTEM ON THE BASIS OF THE EXPANDED ADDBOILER-COOLER OF LIQUID AND GASEOUS MEDIA
Document Type and Number:
WIPO Patent Application WO/2021/242213
Kind Code:
A1
Abstract:
A refrigeration system comprising a compressor (24), a four-way valve (25), an indoor units heat exchanger (26), an outdoor units heat exchanger (27), an expansion valve (29) and characterized in that it comprises a first two-way valve (30) or other shut-off devices, a second two-way valve (31) or other shut-off devices, an expanded addboiler-cooler of liquid and gaseous media (28) containing a housing (1) with cover (2), the liquid circuits inlet orifice (3) and illiquid circuits inlet collector (4), from which a vertical row of a plurality of spiral tubular elements (5) emerges and twisted in a spiral in the direction from a wall of a housing (1 ) to the center and enters by vertical row into the liquid circuits outlet collector (6) having liquid circuits outlet pipe (7), that exits the housing (1) with cover (2) through the liquid circuits outlet orifice (8), wherein the liquid circuits outlet collector (6) has the form of flask through the center of which the gas circuits outlet pipe (12) passes vertically, in which the gaseous media enters through the inlet opening of gas circuits outlet pipe (13) located inside the housing (1) with cover (2) and comes out through the gas circuits outlet pipe (12) and gas circuits outlet orifice (14), wherein the gaseous medium enters the housing (1) with cover (2) through the gas circuits inlet pipe (10), which enters the cover (2) through the gas circuits inlet orifice (9), and then enters between vertically arranged rows of liquid circuits spiral tubular elements (5) through the openings of gas circuits inlet pipe (11) and moves in a spiral relatively parallel between located through one or more rows of liquid circuits spiral tubular elements (5) membranes (17) with liquid taps (18), through which the liquid phase of refrigerant passes in the direction to the lower part of the housing (1) and gaseous phase of refrigerant passes in the direction of the upper part of the housing (1) with cover (2), wherein the rising gaseous medium flows moving direction supported by the upper flow guide rings (19) located in upper cover (2) part, and descending liquid medium flows direction supported by the lower flow guide rings (20) located in the lower housing (1) part, and a part of gas emissions when a liquid media enters the liquid circuits outlet collector (6) are removed inside the housing (1) with cover (2) through the capillary gas pipe (16) located in the upper point of the liquid circuits outlet collector (6), wherein when operation in heat supply mode the refrigerant passes the system elements in the order compressor (24) - four-way valve (25) - indoor units heat exchanger (26) - first two-way valve (30) - expanded addboiler-cooler of liquid and gaseous media (28) - expansion valve (29) - second two-way valve (31) - outdoor units heat exchanger (27) - four-way valve (25) - expanded addboiler-cooler of liquid and gaseous media (28) - compressor (24), and when operation in cold supply mode in the order compressor (24) - four-way valve (25) - outdoor units heat exchanger (27) - second two-way valve (31) - expanded addboiler-cooler of liquid and gaseous media (28) - expansion valve (29) - first two-way valve (30) - indoor units heat exchanger (26) - four-way valve (25) - expanded addboiler-cooler of liquid and gaseous media (28) - compressor (24).

Inventors:
SHOROP PETRO SERHIIOVYCH (UA)
SHVACHKO YURIY IVANOVYCH (UA)
KRYVORUCHKO ARTEM OLEGOVYCH (UA)
KRYVORUCHENKO KOSTIANTYN GEORGIYOVYCH (UA)
Application Number:
PCT/UA2021/000052
Publication Date:
December 02, 2021
Filing Date:
May 26, 2021
Export Citation:
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Assignee:
SHOROP PETRO SERHIIOVYCH (UA)
SHVACHKO YURIY IVANOVYCH (UA)
KRYVORUCHKO ARTEM OLEGOVYCH (UA)
KRYVORUCHENKO KOSTIANTYN GEORGIYOVYCH (UA)
International Classes:
F25B13/00; F25B40/02; F28D7/04; F28F9/22
Domestic Patent References:
WO2019073564A12019-04-18
Foreign References:
US5651265A1997-07-29
US3552140A1971-01-05
JP2004028525A2004-01-29
US3012414A1961-12-12
JP2017036932W2017-10-12
US8899058B22014-12-02
Attorney, Agent or Firm:
GORNISEVYCH, Dmytro Anatoliyovych (UA)
Download PDF:
Claims:
WO 2021/242213 CLAIMS PCT/UA2021/000052

1. A refrigeration system comprising a compressor (24), a four-way valve (25), an indoor units heat exchanger (26), an outdoor units heat exchanger (27), an expansion valve (29) and characterized in that it comprises a first two-way valve (30) or other shut-off devices, a second two-way valve (31) or other shut-off devices, an expanded addboiler-cooler of liquid and gaseous media (28) and arranged so that the refrigerant leaving the compressor (24) through the four-way valve (25) enters or into the indoor units heat exchanger (26) or the outdoor units heat exchanger (27), which in a given mode of operation performs a function of a condenser, and passing either the first two-way valve (30) or other shut-off devices, or the second two-way valve (31) or other shut-off devices, enters the expanded addboiler-cooler of liquid and gaseous media (28), from which it is directed to the expansion valve (29), after which, depending on the set mode of operation, enter either the second two-way valve (31) or other shut-off devices or the first two-way valve (30) or other shut-off devices, and then sent either to the outdoor units heat exchanger (27) or to the indoor units heat exchanger (26), which in a given mode of operation performs a function of an evaporator, and then through the four-way valve (25) enters the expanded addboiler-cooler of liquid and gaseous media (28), from which it is sent to the inlet of compressor (24).

2. Refrigerant equipment according to claim 1 , characterized in that the expanded addboiler-cooler of liquid and gaseous media (28) is located in the refrigerant system so that the entry of the gaseous phase of the refrigerant is through a four-way valve (25) from the outdoor units heat exchanger (27) or from the indoor units heat exchanger (26), namely that performs the function of the evaporator, and the output of the gaseous phase of the refrigerant from it is carried out directly to the inlet of the compressor (24), while the inlet of the liquid phase of the refrigerant to the expanded addboiler-cooler of liquid and gaseous media (28) is carried out either from the indoor units heat exchanger (26) or from the outdoor units heat exchanger (27), namely that performs the function of the condenser, through the first two-way valve (30) or other shut-off devices or through the second two-way valve (31) or other shut-off devices, wherein the output of the liquid phase of the refrigerant from the expanded addboiler- cooler of liquid and gaseous media (28) is carried out to the expansion valve (29).

3. Refrigerant equipment according to claim 2, characterized in that the comprises a housing (1) with a cover (2), the liquid circuits inlet orifice (3), the liquid circuits inlet collector (4), from which a vertical row of a plurality of spiral tubular elements (5) wo 2021/242213^ twisted in a spiral in the direction from a wall of pcT/UA202i/oooo52ie center and enters by vertical row into the liquid circuits outlet collector (6) having liquid circuits outlet pipe (7), that exist the housing (1) with cover (2) through the liquid circuits outlet orifice (8), wherein the liquid circuits outlet collector (6) has the form of flask through the center of which the gas circuits outlet pipe (12) passes vertically, in which the gaseous media enters through the inlet opening of gas circuits outlet pipe (13) located inside the housing (1) with cover (2) and comes out through the gas circuits outlet pipe (12) and gas circuits outlet orifice (14), wherein the gaseous medium enters the housing (1) with cover (2) through the gas circuits inlet pipe (10), which enters the cover (2) through the gas circuits inlet orifice (9), and then enters between vertically arranged rows of liquid circuits spiral tubular elements (5) through the openings of gas circuits inlet pipe (11) and moves in a spiral relatively parallel between located through one or more rows of liquid circuits spiral tubular elements (5) membranes (17) with liquid taps (18), through which the liquid phase of refrigerant passes in the direction to the lower part of the housing (1) and gaseous phase of refrigerant passes in the direction of the upper part of the housing (1) with cover (2), wherein the rising gaseous medium flows moving direction is supports by the upper flow guide rings (19) located in upper cover (2) part, and descending liquid medium flows direction is supports by the lower flow guide rings (20) located in the lower housing (1) part, and a part of gas emissions when a liquid media enters the liquid circuits outlet collector (6) are removed inside the housing (1) with cover (2) through the capillary gas pipe (16) located in the upper point of the liquid circuits outlet collector (6).

4. Refrigerant equipment according to claim 3, characterized in that the liquid circuits spiral tubular elements (5), which exit vertically from the liquid circuits inlet collector (4) and twisted in a spiral in the direction from a wall of housing (1) to the center, and enters by vertical row into the liquid circuits outlet collector (6), creates a vertical wall of channels for the passage of the gaseous medium.

5. Refrigerant equipment according to claim 3, characterized in that the membranes (17) with liquid taps (18), through which the liquid phase of refrigerant passes in the direction to the lower part of the housing (1) and gaseous phase of refrigerant passes in the direction of the upper part of the housing (1) with cover 2 and located horizontally between liquid circuits spiral tubular elements (5), creates a horizontal walls of channels for the passage of the gaseous medium.

Description:
REFRIGERANT SYSTEM ON THE BASIS OF THE EXPANDED ADDBOILER- COOLER OF LIQUID AND GASEOUS MEDIA

The invention relates to refrigerant equipment and refrigerant processes and is untended for refrigerant processes optimization not only in refrigerant systems of inverter type or similar, but in all types refrigerant systems only, where the method of boiling or liquefaction of one of refrigerant is involved. The expanded addboiler-cooler of liquid and gaseous media is created to optimize refrigerant processes, which performs the function of separating the gaseous and liquid refrigerant phases and the function of additional heat exchanger for heating the gaseous and cooling the liquid parts of refrigerant in the systems simultaneously. Unlike existing similar solutions, which use the method of intermediate gas-liquid injection directly into the inverter type compressor, the proposed method of optimizing refrigerant systems is acceptable for all types of refrigerant systems using different types of compressors and controls, and optimizes the operation of such systems not only in the heating supply mode, especially in the external environment low temperature conditions, but also in the mode of cold supply, especially in the external environment high temperature conditions.

Application PCT/JP2017/036932 dated October, 12, 2017 (Publication WO2019073564A1 April, 18, 2019) presents the gas-liquid separator comprises a plurality of inlet pipes (5a, 5b, 5c) that are inserted into a container (1) from different vertical positions on a side face of the container (1) and that discharge refrigerant, and a separator (4) that distributes refrigerant in which gas and liquid are mixed to the plurality of inlet pipes (5a, 5b, 5c) through branching sections (7a, 7b, 7c) which branch so as to differ in the vertical direction. The gas-liquid separator is configured so that a first inlet pipe (5a) connected to a branching section (7a) to be the lowest of the plurality of inlet pipes is inserted in the side face at a position that is lower than the other iniet pipes (5b, 5c) and so that the refrigerant discharged from the first inlet pipe (5a) collides head on with the interior of the container (1).

Closest to the present invention is a heating equipment, including a first heat exchanger, a compressor, a second heat exchanger, and a first expansion valve that decompresses a refrigerant flowing from the second heat exchanger to the first heat exchanger, are connected so as to circulate the refrigerant. A third heat exchanger wo 2021/242213 of the refrigerant flowing from the second heat e;pcT/UA202i/oooo52 st heat exchanger to the refrigerant flowing from the first heat exchanger toward the compressor. An injection circuit merges part of the refrigerant flowing from the second heat exchanger to the first heat exchanger with the refrigerant that is sucked by the compressor. An injection expansion valve is installed in the injection circuit and decompresses the refrigerant flowing in the injection circuit. A fourth heat exchanger is installed in the injection circuit to supply heat of the refrigerant flowing from the second heat exchanger toward the first heat exchanger to the refrigerant flowing in the injection circuit (Patent NsUS 8,899,058 B2 dated December, 02, 2014).

The technical aim of invention is creation of method of optimizing temperature modes in refrigerant systems on the basis of the expanded addboi!er-cooler of liquid and gaseous media not only for inverter refrigerant systems or similar, but in all types of refrigerant systems exclusively, and not only for heat supply modes, especially in the conditions of low ambient temperatures, but also in the cold supply modes, especially in the conditions of the high ambient temperatures. The expanded addboiler-cooler of liquid and gaseous media is created to optimize refrigerant processes, wherein the function of separating of liquid and gaseous refrigerant phases and the function of additional heat exchanger for heating of gaseous and cooling of liquid refrigerants parts in the system are executed simultaneously, which reduces the load on the compressor and makes its work more efficiently when compressing the gaseous refrigerant, on the one hand, and provides more improved heat extraction when additionally cooled liquid phase refrigerant is supplied through the expansion device to the evaporator. Such a redistribution of heat flows inside of a closed refrigerant system reduces the dependence of its efficiency significantly on external both high and low temperatures in both the heating and the cold supply mode. The proposed layout scheme is universal because the arrangement of refrigerant system units is decided in such a way that gas and liquid refrigerant phases are prepared for further distribution of flows in the specified modes occurs in the single scheme, in a single section and in the same directions of flow of different refrigerant phases.

The set goal is achieved due to the expanded addboiler-cooler of liquid and gaseous media and the method of optimizing temperature modes in refrigerant systems containing a compressor, four-way valve, an indoors unit heat exchanger, an outdoor units heat exchanger, an expansion device, and characterized in that a refrigerant system contains the first and second two-way valves controlling the flows of gaseous wo 2021/242213 ase of the refrigerant depending on systems operpcT/UA202i/oooo52e, and the expanded addboiler-cooler of liquid and gaseous media, which execute function of separating of liquid and gaseous refrigerant phases and the function of additional heat exchanger for heating of gaseous and cooling of liquid refrigerants parts and comprising a housing with a cover, a liquid circuits inlet orifice and inlet collector, from which a vertical row of a plurality spiral tubular elements emerges and twisted in the direction from a wall of a housing to the center and enters by vertical row into the liquid circuits outlet collector, having liquid circuits outlet pipe that exist the housing with a cover through the liquid circuits outlet orifice, wherein the liquid circuits outlet collector has the form of flask through the center of which the gas circuits outlet pipe passes vertically, in which the gaseous media enters through the inlet opening of gas circuits outlet pipe, located inside the housing with cover, and comes out through the gas circuits outlet pipe and outlet orifice, wherein the gaseous medium enters the housing with cover through the gas circuits inlet pipe and inlet orifice and then enters between vertically arranged rows of liquid circuits spiral tubular elements through the openings of gas circuits inlet pipe and moves in a spiral relatively parallel between located through one or more rows of liquid circuits spiral tubular elements membranes with liquid taps, through which the liquid phase of refrigerant passes in the direction to the lower part of the housing and gaseous phase of refrigerant passes in the direction of the upper part of the housing with cover, wherein the rising gaseous medium flows moving direction is supports by the upper flow guide rings located in upper cover part, and descending liquid medium flows direction is supports by the lower flow guide rings located in the lower housing part, and a part of gas emissions when a liquid media enters the liquid circuits outlet collector, are removed inside the housing with cover through the capillary gas pipe located in the upper point of the liquid circuits outlet collector, wherein when operation in heat supply mode the refrigerant flow passes the refrigerant chains elements in the following order: compressor - four-way valve - indoor units heat exchanger - first two-way valve - expanded addboiler-cooler of liquid and gaseous media - expansion valve - second two-way valve - outdoor units heat exchanger - four-way valve - expanded addboiler-cooler of liquid and gaseous media

- compressor, and when operation in cold supply mode: compressor - four-way valve

- outdoor units heat exchanger - second two-way valve - expanded addboiler-cooler of liquid and gaseous media - expansion valve - first two-way valve - indoor units heat exchanger - four-way valve - expanded addboiler-cooler of liquid and gaseous media - compressor. wo 2021/242213 ; RIPTION OF THE DRAWINGS: PCT/UA2021/OOOO52

Fig. 1 is a cross-sectional view of the expanded addboiler-cooler of liquid and gaseous media.

Fig. 2 is a part of the expanded addboiler-cooler of liquid and gaseous media in section A- A.

Fig. 3 is a part of the expanded addboiler-cooler of liquid and gaseous media in section B - B.

Fig. 4 is a part of the expanded addboiler-cooler of liquid and gaseous media in section C - C.

Fig. 5 is a membrane with technological openings and liquid traps.

Fig. 6 is a liquid circuit, combined with gas circuits outlet pipe, and gas circuits inlet pipe assembly.

Fig. 7 is a liquid circuit, combined with gas circuits outlet pipe, and gas circuits inlet pipe, and membranes assembly.

Fig. 8 is the variant of equipment layout scheme using an expanded addboiler-cooler of liquid and gaseous media.

Fig. 9 is refrigerant cycle working diagram using an expanded addboiler-cooler of liquid and gaseous media in heating supply mode.

Fig. 10 is refrigerant cycle working diagram using an expanded addboiler-cooler of liquid and gaseous media in cold supply mode. where:

1 - housing; 2 - cover; 3 - liquid circuits inlet orifice; 4 - liquid circuits inlet collector;

5 - liquid circuits spiral tubular elements; 6 - liquid circuits outlet collector; 7 - liquid circuits outlet pipe; 8 - liquid circuits outlet orifice; 9 - gas circuits inlet orifice; 10 - gas circuits inlet pipe ; 11 - openings of gas circuits inlet pipe; 12 - gas circuits outlet pipe; 13 - inlet opening of gas circuits outlet pipe; 14 - gas circuits outlet orifice; 15 - oil suction hole of gas circuits outlet pipe; 16 - capillary gas pipe; 17 - membranes; 18 - liquid traps; 19 - upper flow guide rings; 20 - lower flow guide rings; 21 - technological openings of membranes for liquid circuits inlet collector; 22 - technological openings of membrane for liquid circuits outlet collector; 23 - technological openings for gas circuits inlet pipe; 24 - compressor; 25 - four-way valve; 26 - indoor units heat exchanger; 27 - outdoor units heat exchanger; 28 expanded addboiler-cooling of liquid and gaseous media; 29 - expansion valve; 30 - first two-way valve; 31 - second two-way valve. WO 2021/242213 ESCRIPTION OF THE DRAWINGS: PCT/UA2021/000052

According to the technical task the optimizing of temperature modes solves due to expanded addboiler-cooler of liquid and gaseous media and method of optimizing temperature modes in refrigerant systems that consists of compressor 24, four-way valve 25, indoor units heat exchanger 26, outdoor units heat exchanger 27, expansion valve 29, and characterized in that refrigerant system contains first 30 and second 32 two-way valves 30 or other shut-off devices controlling gaseous and liquid refrigerant phase flows depending on setting mode operation, and the expanded addboiler-cooler of liquid and gaseous media 28, which performs the function of separating the gaseous and liquid refrigerant phases and the function of additional heat exchanger for heating the gaseous and cooling the liquid parts of refrigerant in the systems simultaneously and contains a housing 1 with a cover 2, liquid circuits inlet orifice 3 and inlet collector 4, from which a vertical row of a plurality liquid circuits spiral tubular elements 5 emerges and twisted in the direction from a wall of a housing 1 to the center and enters by vertical row into the liquid circuits outlet collector 6, having liquid circuits outlet pipe 7 that exits the housing 1 with a cover 2 through the liquid circuits outlet orifice 8, wherein the liquid circuits outlet collector 6 has the form of flask through the center of which the gas circuits outlet pipe 12 passes vertically, in which the gaseous media enters through the inlet opening of gas circuits outlet pipe 13 located inside the housing 1 with cover 2, and comes out through the gas circuits outlet pipe 12 and outlet orifice 14, wherein the gaseous medium enters the housing 1 with cover 2 through the gas circuits inlet pipe 10 and inlet orifice 9 and then enters between vertically arranged rows of liquid circuits spiral tubular elements 5 through the openings of gas circuits inlet pipe 11 and moves in a spiral relatively parallel between located through one or more rows of liquid circuits spiral tubular elements 5 membranes 17 with liquid taps 18, through which the liquid phase of refrigerant passes in the direction to the lower part of the housing 1 and gaseous phase of refrigerant passes in the direction of the upper part of the housing 1 with cover 2, wherein the rising gaseous medium flows moving direction supported by the upper flow guide rings 19 located in upper cover 2 part, and descending liquid medium flows direction supported by the lower flow guide rings 20 located in the lower housing 1 part, and a part of gas emissions when a liquid media enters the liquid circuits outlet collector 6, are removed inside the housing 1 with cover 2 through the capillary gas pipe 16 located in the upper point of the liquid circuits outlet collector 6, wherein when operation in heat supply mode the refrigerant flow passes the refrigerant chains wo 2021/242213 is following order: compressor 24 - four-way valvpcT/UA202i/oooo52ts heat exchanger 26 - first two-way valve 30 - expanded addboiler-cooler of liquid and gaseous media 28 - expansion valve 29 - second two-way valve 31 - outdoor units heat exchanger 27 - four-way valve 25 - expanded addboiler-cooler of liquid and gaseous media 28 - compressor 24, and when operation in cold supply mode: compressor 24 - four-way valve 25 - outdoor units heat exchanger 27 - second two- way valve 31 - expanded addboiler-cooler of liquid and gaseous media 28 - expansion valve 29 - first two-way valve 30 - indoor units heat exchanger 26 - four-way valve 25 - expanded addboiler-cooler of liquid and gaseous media 28 - compressor 24.

The refrigerant system consists of a compressor 24, four-way valve 25, indoor units heat exchanger 26, outdoor units heat exchanger 27, expansion valve 29 and characterized in that it contains the first 30 and second 31 two-way valves or other shut-off devices, and the expanded addboiler-cooler of liquid and gaseous media 28, operates as follows: when operation in heat supply mode the refrigerant passes the system elements in the order compressor 24 - four-way valve 25 - indoor units heat exchanger 26 - first two-way valve 30 - expanded addboiler-cooler of liquid and gaseous media 28 - expansion valve 29 - second two-way valve 31 - outdoor units heat exchanger 27 - four-way valve 25 - expanded addboiler-cooler of liquid and gaseous media 28 - compressor, and when operation in cold supply mode in the order compressor 24 - four-way valve 25 - outdoor units heat exchanger 27 - second two-way valve 31 - expanded addboiler-cooler of liquid and gaseous media 28 - expansion valve 29 - first two-way valve 30 - indoor units heat exchanger 26 - four way valve 25 - expanded addboiler-cooler of liquid and gaseous media 28 - compressor 24. Thus the first 30 and second 31 two-way valves or other shut-off devices guides gaseous and liquid phases of refrigerant depending on the set operating mode of the system, and the expanded addboiler-cooler of liquid and gaseous media 28 execute function of separating of liquid and gaseous refrigerant phases and the function of additional heat exchanger for heating of gaseous and cooling of liquid refrigerants part in the system, whereby the increased temperature of gaseous medium entering from the expanded addboiler-cooler of liquid and gaseous media 28 into the compressor 24 reduces the load required to compress refrigerant, on the one hand, and decreased temperature of liquid media entering from the expanded addboiler-cooler of liquid and gaseous media 28 to the expansion valve 29 provides decreased temperature of gaseous medium entering into the heat exchanger 26 or 27 performing a function of evaporator depending on setting mode, and wo 2021/242213 amount of heat extracted from working medium, PCT/UA2021/OOOO521, wherein the separation of gas-liquid medium into gaseous and liquid phases and heat exchange inside the expanded addboiler-cooler of liquid and gaseous media 28 is carried out by supplying of liquid medium to the high pressure liquid circuit located inside the housing 1 with cover 2 through the inlet orifice 3 and inlet collector 4, from which a vertical row of a plurality liquid circuits spiral tubular elements 5 emerges and twisted in the direction from a wall of a housing 1 to the center and enters by vertical row into the liquid circuits outlet collector 6 having the outlet pipe 7 that exist a housing 1 through the liquid circuits outlet orifice 8, wherein the liquid circuits outlet collector 6 has the form of flask through the center of which the gas circuits outlet pipe 12 passes vertically, in which the gaseous media enters through the inlet opening of gas circuits outlet pipe 13 located inside the housing 1 with cover 2, and comes out through the gas circuits outlet pipe 12 and outlet orifice 14, wherein the gaseous medium enters the housing 1 with cover 2 through the gas circuits inlet pipe 10 and inlet orifice 9 and then enters between vertically arranged rows of liquid circuits spiral tubular elements 5 through the openings of gas circuits inlet pipe 11 and moves in a spiral relatively parallel between located through one or more rows of liquid circuits spiral tubular elements 5 membranes 17 with liquid taps 18, through which the liquid phase of refrigerant passes in the direction to the lower part of the housing 1 and gaseous phase of refrigerant passes in the direction of the upper part of the housing 1 with cover 2, wherein the rising gaseous medium flows moving direction supported by the upper flow guide rings 19 located in upper cover 2 part, and descending liquid medium flows direction supported by the lower flow guide rings 20 located in the lower housing 1 part, and a part of gas emissions when a liquid media enters the liquid circuits outlet collector 6, are removed inside the housing 1 with cover 2 through the capillary gas pipe 16 located in the upper point of the liquid circuits outlet collector 6.