CN109386983B - Two-pipe jet enthalpy-increasing outdoor unit and multi-split system - Google Patents

Two-pipe jet enthalpy-increasing outdoor unit and multi-split system Download PDF

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Publication number
CN109386983B
CN109386983B CN201811227632.6A CN201811227632A CN109386983B CN 109386983 B CN109386983 B CN 109386983B CN 201811227632 A CN201811227632 A CN 201811227632A CN 109386983 B CN109386983 B CN 109386983B
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China
Prior art keywords
vapor injection
enhanced vapor
heat exchanger
interface
outdoor unit
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CN201811227632.6A
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Chinese (zh)
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CN109386983A (en
Inventor
颜利波
杨国忠
王命仁
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Priority to CN201811227632.6A priority Critical patent/CN109386983B/en
Publication of CN109386983A publication Critical patent/CN109386983A/en
Priority to US16/619,599 priority patent/US20200173696A1/en
Priority to CA3065395A priority patent/CA3065395A1/en
Priority to PCT/CN2019/089858 priority patent/WO2020082739A1/en
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Publication of CN109386983B publication Critical patent/CN109386983B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/385—Dispositions with two or more expansion means arranged in parallel on a refrigerant line leading to the same evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0253—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in parallel arrangements
    • F25B2313/02533—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in parallel arrangements during heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13—Economisers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/23—Separators

Abstract

The invention provides a two-pipe enhanced vapor injection outdoor unit and a multi-split system, wherein the two-pipe enhanced vapor injection outdoor unit comprises: the outdoor heat exchanger, the first interface and the second interface; the enhanced vapor injection compressor comprises an exhaust port, a return air port and an injection port; the reversing assembly comprises a first end to a fourth end, the first end of the reversing assembly is connected with the exhaust port, and the second end of the reversing assembly is connected with the air return port; the flash evaporator comprises a refrigerant inlet, an air outlet and a liquid outlet, the air outlet is connected with the jet orifice, and the liquid outlet is respectively connected with the first interface and the inlet of the outdoor heat exchanger; one end of the throttling component is connected with the refrigerant inlet, and the other end of the throttling component is connected with the second interface; one end of the first pipeline is connected with an outlet of the outdoor heat exchanger, the other end of the first pipeline is positioned between the throttling component and the second interface, the flash evaporator and the throttling component are added, the refrigerant circulation volume during low-temperature heating operation is obviously increased, and the low-temperature heating operation range is expanded in the two-pipe enhanced vapor injection outdoor unit.

Description

Two-pipe jet enthalpy-increasing outdoor unit and multi-split system
Technical Field
The invention relates to the technical field of refrigeration, in particular to a two-pipe enhanced vapor injection outdoor unit and a two-pipe enhanced vapor injection multi-split system.
Background
The conventional enhanced vapor injection low-temperature intense heat technology is only applied to a heat pump and a three-pipe heating recovery system at present, and the two-pipe system has difficulty in realizing enthalpy injection at the air injection port of a compressor because the return air pipe at the outer side of the two-pipe system has only low pressure. The multi-split air conditioning system with two control systems can lead to low-pressure lateral pressure low due to low environmental temperature, low return air density and small refrigerant circulation amount under low-temperature environment, thereby solving the problems of insufficient heating capacity and insufficient exhaust superheat degree and refrigerating capacity under high-temperature environment with two control systems.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
One aspect of the present invention provides a two-tube enhanced vapor injection outdoor unit.
One aspect of the invention provides a two-pipe enhanced vapor injection multi-split system.
In view of the above, the present invention provides a two-tube enhanced vapor injection outdoor unit, which includes: the outdoor heat exchanger, the first interface and the second interface; the enhanced vapor injection compressor comprises an exhaust port, a return air port and an injection port; the reversing assembly comprises a first end to a fourth end, the first end of the reversing assembly is connected with the exhaust port, and the second end of the reversing assembly is connected with the air return port; the flash evaporator comprises a refrigerant inlet, an air outlet and a liquid outlet, the air outlet is connected with the jet orifice, and the liquid outlet is respectively connected with the first interface and the inlet of the outdoor heat exchanger; one end of the throttling component is connected with the refrigerant inlet, and the other end of the throttling component is connected with the second interface; and one end of the first pipeline is connected with the outlet of the outdoor heat exchanger, and the other end of the first pipeline is positioned between the throttling assembly and the second connector.
The invention provides a two-pipe enhanced vapor injection outdoor unit, which comprises an outdoor heat exchanger, a first interface, a second interface, an enhanced vapor injection compressor, a reversing component, a flash evaporator, a throttling component and a first pipeline, wherein the first end of the reversing component is connected with an exhaust port, the second end of the reversing component is connected with an air return port, an air outlet of the flash evaporator is connected with a jet orifice, a liquid outlet of the flash evaporator is respectively connected with the first interface and an inlet of the outdoor heat exchanger, a refrigerant inlet of the flash evaporator is connected with one end of the throttling component, the other end of the throttling component is connected with the second interface, one end of the first pipeline is connected with an outlet of the outdoor heat exchanger, and the other end of the first pipeline is positioned between the throttling component and the second interface. Meanwhile, a flash evaporator and a throttling component are added, the refrigerant circulation quantity in low-temperature heating operation is obviously increased, the low-temperature heating operation range is expanded in the two-pipe enhanced vapor injection outdoor unit, the heating capacity is obviously improved, and the purposes of improving the high-temperature refrigerating capacity and reducing the exhaust superheat degree are achieved.
In addition, a first pipeline is added, so that the enhanced vapor injection effect can be realized in four modes of refrigeration, heating, main refrigeration and main heating.
A flash vessel is a vessel that can contain a refrigerant, and typically has three interfaces: a refrigerant inlet for the refrigerant gas-liquid mixture to enter, a refrigerant gas outlet and a refrigerant liquid outlet. The working principle is as follows: the gas-liquid mixture of the refrigerant from the upstream throttling element flows in from a refrigerant inlet of the flash evaporator, a large amount of refrigerant is flashed from the liquid refrigerant due to the sudden expansion of the volume, the refrigerant is changed into refrigerant gas with lower temperature and flows out from a gas outlet, and the liquid refrigerant without flashing flows out of the flash evaporator from a liquid outlet. So that no liquid drops are entrained at the gas outlet of the flash evaporator, and no gas is mixed at the liquid outlet.
Because the gas outlet of the flash evaporator is connected with the jet orifice, the refrigerant discharged from the gas outlet can be ensured to be gaseous refrigerant during enhanced vapor injection, the problem of liquid impact of the enhanced vapor injection compressor is effectively prevented, and the service life of the enhanced vapor injection compressor is ensured.
Compared with a three-pipe heating recovery multi-split air-conditioning system in the related art, the two-pipe heating recovery multi-split air-conditioning system provided by the invention has the advantages that the structure is simple, copper pipe materials are saved, and the installation cost is reduced.
In addition, the two-pipe enhanced vapor injection outdoor unit provided by the invention is applied to a two-pipe enhanced vapor injection multi-split system, the multi-split system is a heat recovery multi-split system, the meaning of heat recovery is to recover heat discharged by a refrigerating room for heating the room, specifically, the system absorbs heat from the refrigerating room through an indoor unit heat exchanger, then releases all or part of the heat to the heating room through the indoor unit heat exchanger for heating, and the insufficient or residual heat of the system is absorbed from the environment through the outdoor unit heat exchanger. For a common heat pump multi-split air conditioner, all heat required by the heating indoor unit is absorbed and consumed by the heat exchanger of the outdoor unit. Therefore, compared with the common heat pump, the heat recovery multi-connected machine has obvious energy-saving effect.
The heat recovery multi-online machine has 4 operation modes: refrigeration, main heating and heating. When all the running indoor units are in the cooling/heating mode, the outdoor unit runs in the cooling/heating mode; when the running indoor unit has refrigeration and heating and the refrigeration load is greater than the heating load, the outdoor unit runs in a main refrigeration mode; when the operating indoor unit has both cooling and heating and the cooling load is less than the heating load, the outdoor unit will operate in the main heating mode. If the flow rates required to operate the cooling and heating indoor units are exactly equal, the system operates in full heat recovery mode.
In addition, the two-pipe enhanced vapor injection outdoor unit provided by the technical scheme of the invention also has the following additional technical characteristics:
in any of the above technical solutions, preferably, the third end of the reversing assembly is switchably connected to the inlet of the outdoor heat exchanger or the outlet of the outdoor heat exchanger, and the fourth end of the reversing assembly is switchably connected to the second port or the first port.
In the technical scheme, a third end of the reversing assembly is connected to an inlet of the outdoor heat exchanger or an outlet of the outdoor heat exchanger in a switchable manner, a fourth end of the reversing assembly is connected to a second interface or a first interface in a switchable manner, when the two-pipe enhanced vapor injection multi-split air-conditioning system is in a refrigeration and main refrigeration mode, the third end of the reversing assembly is connected with the inlet of the outdoor heat exchanger, and the fourth end of the reversing assembly is connected with the second interface; when the two-pipe enhanced vapor injection multi-split system is in a heating and main heating mode, the third end of the reversing assembly is connected with the outlet of the outdoor heat exchanger, and the fourth end of the reversing assembly is connected with the first interface, so that different flow directions of refrigerants are realized.
In any of the above technical solutions, preferably, the two-tube enhanced vapor injection outdoor unit includes: the first electromagnetic valve is arranged between the air outlet and the jet orifice, and the conducting direction of the first electromagnetic valve is from the air outlet to the jet orifice.
In the technical scheme, the two-pipe enhanced vapor injection outdoor unit comprises a first electromagnetic valve, the first electromagnetic valve is switched on and off, and is closed when the first electromagnetic valve is switched on, the switching-on direction of the first electromagnetic valve is from the air outlet to the jet orifice, namely, only the refrigerant is allowed to be switched on from the air outlet to the jet orifice, and the refrigerant backflow phenomenon is avoided.
In any of the above technical solutions, preferably, the two-tube enhanced vapor injection outdoor unit includes: the first one-way valve is arranged on the first pipeline, and the conduction direction of the first one-way valve is from the outlet of the outdoor heat exchanger to the direction of the throttling assembly.
In the technical scheme, by adding the first pipeline, the outlet of the outdoor heat exchanger is connected with the throttling assembly, the first one-way valve is arranged on the first pipeline, the first one-way valve is additionally arranged between the outlet of the outdoor heat exchanger and the throttling assembly, air leakage between the outlet of the outdoor heat exchanger and the throttling assembly during heating is prevented, only when the cooling and main cooling modes are allowed, the refrigerant flowing out of the outlet of the outdoor heat exchanger flows into the throttling assembly through the first one-way valve, and when the heating and main heating modes are performed, the first one-way valve is closed, so that the refrigerant flowing out of the outlet of the outdoor heat exchanger cannot pass through the first pipeline.
In any of the above technical solutions, preferably, the two-tube enhanced vapor injection outdoor unit includes: the first connector is connected with the liquid outlet through the first one-way valve, and the conduction direction of the first one-way valve is from the liquid outlet to the first connector; and the third one-way valve connects the second interface with the throttling assembly, and the conduction direction of the third one-way valve is the direction from the second interface to the throttling assembly.
In the technical scheme, the two-pipe enhanced vapor injection outdoor unit comprises a second one-way valve, the conduction direction of the second one-way valve is the direction from the liquid outlet to the first interface, one end of the second one-way valve is located between the liquid outlet and the inlet of the outdoor heat exchanger, and the other end of the second one-way valve is connected with the first interface. And when in the refrigeration and main refrigeration modes, the second one-way valve is opened, so that the refrigerant flowing out of the liquid outlet of the flash evaporator flows to the first interface through the second one-way valve. And when in the heating and main heating modes, the second one-way valve is closed, and the refrigerant flowing out of the liquid outlet of the flash evaporator cannot pass through the second one-way valve and only can pass through the inlet of the outdoor heat exchanger.
Furthermore, the two-pipe enhanced vapor injection outdoor unit comprises a third one-way valve, and the conduction direction of the third one-way valve is the direction from the second interface to the throttling assembly. And in the heating and main heating modes, the third one-way valve is opened, and the refrigerant flowing out of the second interface flows to the direction of the throttling assembly through the third one-way valve. And when in the refrigeration and main refrigeration modes, the third one-way valve is closed, and the refrigerant flowing out of the first pipeline can only flow to the throttling assembly.
In any of the above technical solutions, preferably, the two-tube enhanced vapor injection outdoor unit includes: the fourth one-way valve connects the second interface with the fourth end of the reversing assembly, and the conduction direction of the fourth one-way valve is from the second interface to the fourth end of the reversing assembly; and the first interface is connected with the fourth end of the reversing assembly through the fifth one-way valve, and the conduction direction of the fifth one-way valve is from the fourth end of the reversing assembly to the first interface.
In the technical scheme, the two-pipe enhanced vapor injection outdoor unit comprises a fourth check valve and a fifth check valve, the fourth check valve connects the second interface with the fourth end of the reversing assembly, the conduction direction of the fourth check valve is from the second interface to the fourth end of the reversing assembly, the fifth check valve connects the first interface with the fourth end of the reversing assembly, the conduction direction of the fifth check valve is from the fourth end of the reversing assembly to the first interface, when the refrigeration and main refrigeration modes are carried out, the fourth check valve is conducted, the fifth check valve is closed, and when the heating and main heating modes are carried out, the fifth check valve is conducted, and the fourth check valve is closed.
In any of the above technical solutions, preferably, the two-tube enhanced vapor injection outdoor unit includes: the third end of the reversing assembly is connected with the inlet of the outdoor heat exchanger through the sixth one-way valve, and the conduction direction of the sixth one-way valve is from the third end of the reversing assembly to the outdoor heat exchanger; and the seventh check valve connects the third end of the reversing assembly with the outlet of the outdoor heat exchanger, and the conduction direction of the seventh check valve is from the outlet of the outdoor heat exchanger to the third end of the reversing assembly.
In the technical scheme, the two-pipe enhanced vapor injection outdoor unit comprises: the sixth one-way valve and the seventh one-way valve are both connected with the third end of the reversing assembly, the other ends of the sixth one-way valve and the seventh one-way valve are respectively connected with the inlet of the outdoor heat exchanger and the outlet of the outdoor heat exchanger, the sixth one-way valve is conducted and the seventh one-way valve is closed when the refrigeration and main refrigeration modes are carried out, and the seventh one-way valve is conducted and the sixth one-way valve is closed when the heating and main heating modes are carried out.
In any of the above technical solutions, preferably, the throttling assembly includes at least one throttling device and at least one eighth check valve connected in parallel, and a direction of conduction of the eighth check valve is a direction from the second port to the refrigerant inlet.
In this technical scheme, the throttling assembly includes parallelly connected at least one throttling set and at least one eighth check valve, the direction that switches on of eighth check valve is by the direction of second interface to refrigerant entry, can be a parallelly connected eighth check valve of a throttling set, or be a parallelly connected a plurality of eighth check valves of a throttling set, a plurality of parallelly connected eighth check valve of a throttling set to guarantee the effect of throttle step-down, and can realize better step-down effect after multistage step-down.
In any of the above technical solutions, preferably, the two-tube enhanced vapor injection outdoor unit includes: a second pipeline connecting the exhaust port with the first interface; and the second electromagnetic valve is arranged on the second pipeline, and the conduction direction of the second electromagnetic valve is the direction from the exhaust port to the first interface.
In the technical scheme, the two-pipe enhanced vapor injection outdoor unit comprises a second pipeline and a second electromagnetic valve arranged on the second pipeline, when in a refrigeration mode, the second electromagnetic valve is closed, and refrigerants discharged from an exhaust port all enter an inlet of the outdoor heat exchanger through a third end of the reversing assembly; in the main refrigeration mode, the second electromagnetic valve is opened, part of the refrigerant discharged from the exhaust port enters the inlet of the outdoor heat exchanger through the third end of the reversing assembly, and the other part of the refrigerant enters the first interface through the second electromagnetic valve, so that the two-pipe enhanced vapor injection multi-split system can realize the two refrigeration modes.
In any of the above technical solutions, preferably, the two-tube enhanced vapor injection outdoor unit includes: and the ninth one-way valve connects the inlet of the outdoor heat exchanger with the liquid outlet, and the conduction direction of the ninth one-way valve is the direction from the liquid outlet to the inlet of the outdoor heat exchanger.
In the technical scheme, the two-pipe enhanced vapor injection outdoor unit comprises a ninth check valve, and the conduction direction of the ninth check valve is the direction from the liquid outlet to the inlet of the outdoor heat exchanger. And when in the refrigeration and main refrigeration modes, the ninth one-way valve is closed, and the refrigerant flowing out of the liquid outlet of the flash evaporator cannot enter the inlet of the outdoor heat exchanger through the ninth one-way valve and can only enter the first interface through the pipeline where the second one-way valve is located. And in the heating and main heating modes, the ninth one-way valve is opened, and the refrigerant flowing out of the liquid outlet of the flash evaporator enters the inlet of the outdoor heat exchanger through the ninth one-way valve.
According to an aspect of the present invention, a two-pipe enhanced vapor injection multiple on-line system is provided, which includes the two-pipe enhanced vapor injection outdoor units according to any of the above technical solutions, and therefore, the two-pipe enhanced vapor injection multiple on-line system has all the advantages of the two-pipe enhanced vapor injection outdoor units according to any of the above technical solutions.
Additional aspects and advantages in accordance with the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram illustrating a two-tube enhanced vapor injection multi-split system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating another configuration of a two-tube enhanced vapor injection multiple on-line system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a two-tube enhanced vapor injection multiple on-line system in a cooling mode according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram illustrating a heating mode of a two-tube enhanced vapor injection multi-split system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a two-tube enhanced vapor injection multiple on-line system in a main cooling mode according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram illustrating a two-pipe enhanced vapor injection multi-split system in a main heating mode according to an embodiment of the present invention;
fig. 7 shows a pressure-enthalpy diagram of a two-pipe enhanced vapor injection multi-split system according to an embodiment of the present invention.
Reference numerals:
wherein, the correspondence between the reference numbers and the part names in fig. 1 to 6 is:
10 outdoor heat exchanger, 12 first interface, 14 second interface, 16 enhanced vapor injection compressor, 162 exhaust port, 164 return air port, 166 jet port, 18 reversing component, 20 flash evaporator, 202 refrigerant inlet, 204 air outlet, 206 liquid outlet, 22 throttling component, 222 throttling device, 224 eighth check valve, 24 first pipeline, 26 first electromagnetic valve, 28 first check valve, 30 second check valve, 32 third check valve, 34 fourth check valve, 36 fifth check valve, 38 sixth check valve, 40 seventh check valve, 42 second electromagnetic valve, 44 ninth check valve, 46 two-pipe enhanced vapor injection indoor unit, 48 refrigerant flow direction switching device, 50 gas-liquid separator, 52 first subcooler, 54 second subcooler.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
A two-tube enhanced vapor injection outdoor unit and a two-tube enhanced vapor injection multi-split system according to an embodiment of the present invention will be described with reference to fig. 1 to 7.
As shown in fig. 1 to fig. 6, the two-tube enhanced vapor injection outdoor unit according to the present invention comprises: an outdoor heat exchanger 10, a first interface 12 and a second interface 14; enhanced vapor injection compressor 16 including a discharge port 162, a return port 164, and an injection port 166; the reversing assembly 18 comprises a first end to a fourth end, the first end of the reversing assembly 18 is connected with the exhaust port 162, and the second end of the reversing assembly 18 is connected with the return air port 164; the flash evaporator 20 comprises a refrigerant inlet 202, an air outlet 204 and an liquid outlet 206, wherein the air outlet 204 is connected with the injection port 166, and the liquid outlet 206 is respectively connected with the first interface 12 and the inlet of the outdoor heat exchanger 10; one end of the throttling component 22 is connected with the refrigerant inlet 202, and the other end of the throttling component 22 is connected with the second interface 14; and a first pipeline 24 having one end connected to the outlet of the outdoor heat exchanger 10 and the other end located between the throttling assembly 22 and the second port 14.
The invention provides a two-pipe enhanced vapor injection outdoor unit, which comprises an outdoor heat exchanger 10, a first interface 12, a second interface 14, an enhanced vapor injection compressor 16, a reversing assembly 18, a flash evaporator 20, a throttling assembly 22 and a first pipeline 24, wherein the first end of the reversing assembly 18 is connected with an exhaust port 162, the second end of the reversing assembly 18 is connected with an air return port 164, an air outlet 204 of the flash evaporator 20 is connected with an injection port 166, a liquid outlet 206 of the flash evaporator 20 is respectively connected with the first interface 12 and an inlet of the outdoor heat exchanger 10, a refrigerant inlet 202 of the flash evaporator 20 is connected with one end of the throttling assembly 22, the other end of the throttling assembly 22 is connected with the second interface 14, one end of the first pipeline 24 is connected with an outlet of the outdoor heat exchanger 10, and the other end of the first pipeline 24 is positioned between the throttling assembly 22 and the second interface 14 The air is supplied for enthalpy increasing compression, the flash evaporator 20 and the throttling component 22 are added at the same time, the refrigerant circulation quantity in low-temperature heating operation is obviously increased, the low-temperature heating operation range is expanded in the two-pipe air injection enthalpy increasing outdoor unit, the heating capacity is obviously improved, and the purposes of improving the high-temperature refrigerating capacity and reducing the exhaust superheat degree are achieved.
In addition, the first pipeline 24 is added, so that the enhanced vapor injection effect can be realized in four modes of refrigeration, heating, main refrigeration and main heating.
The flash evaporator 20 is a vessel that can contain a refrigerant and typically has three interfaces: a refrigerant inlet 202 for the refrigerant gas-liquid mixture to enter, a refrigerant outlet 204 and a refrigerant outlet 206. The working principle is as follows: the gas-liquid mixture of the refrigerant from the upstream throttling element flows into the refrigerant inlet 202 of the flash evaporator 20, and due to the sudden volume expansion, a large amount of refrigerant is flashed from the liquid refrigerant, changed into refrigerant gas with lower temperature, and flows out of the gas outlet 204, while the liquid refrigerant without flashing flows out of the flash evaporator 20 from the liquid outlet 206. So that no liquid droplets are entrained at the gas outlet 204 of the flash evaporator 20 and no gas is mixed at the liquid outlet 206.
Because the gas outlet 204 of the flash evaporator 20 is connected with the jet orifice 166, during enhanced vapor injection, the refrigerant discharged from the gas outlet 204 can be ensured to be gaseous refrigerant, thereby effectively preventing the problem of liquid impact of the enhanced vapor injection compressor 16 and ensuring the service life of the enhanced vapor injection compressor 16.
Compared with a three-pipe heating recovery multi-split air-conditioning system in the related art, the two-pipe heating recovery multi-split air-conditioning system provided by the invention has the advantages that the structure is simple, copper pipe materials are saved, and the installation cost is reduced.
In addition, the two-pipe enhanced vapor injection outdoor unit provided by the invention is applied to a two-pipe enhanced vapor injection multi-split system, the multi-split system is a heat recovery multi-split system, the meaning of heat recovery is to recover heat discharged by a refrigerating room for heating the room, specifically, the system absorbs heat from the refrigerating room through an indoor unit heat exchanger, then releases all or part of the heat to the heating room through the indoor unit heat exchanger for heating, and the insufficient or residual heat of the system is absorbed from the environment through the outdoor unit heat exchanger. For a common heat pump multi-split air conditioner, all heat required by the heating indoor unit is absorbed and consumed by the heat exchanger of the outdoor unit. Therefore, compared with the common heat pump, the heat recovery multi-connected machine has obvious energy-saving effect.
The heat recovery multi-online machine has 4 operation modes: refrigeration, main heating and heating. When all the running indoor units are in the cooling/heating mode, the outdoor unit runs in the cooling/heating mode; when the running indoor unit has refrigeration and heating and the refrigeration load is greater than the heating load, the outdoor unit runs in a main refrigeration mode; when the operating indoor unit has both cooling and heating and the cooling load is less than the heating load, the outdoor unit will operate in the main heating mode. If the flow rates required to operate the cooling and heating indoor units are exactly equal, the system operates in full heat recovery mode.
In one embodiment provided by the present invention, preferably, the third end of the reversing assembly 18 is switchably connected to the inlet of the outdoor heat exchanger 10 or the outlet of the outdoor heat exchanger 10, and the fourth end of the reversing assembly 18 is switchably connected to the second port 14 or the first port 12.
In this embodiment, the third end of the reversing assembly 18 is switchably connected to the inlet of the outdoor heat exchanger 10 or the outlet of the outdoor heat exchanger 10, the fourth end of the reversing assembly 18 is switchably connected to the second interface 14 or the first interface 12, when the two-pipe enhanced vapor injection multi-split air-conditioning system is in the cooling and main cooling mode, the third end of the reversing assembly 18 is connected to the inlet of the outdoor heat exchanger 10, and the fourth end of the reversing assembly 18 is connected to the second interface 14; when the two-pipe enhanced vapor injection multi-split system is in a heating and main heating mode, the third end of the reversing assembly 18 is connected with the outlet of the outdoor heat exchanger 10, and the fourth end of the reversing assembly 18 is connected with the first interface 12, so that different flow directions of the refrigerant are realized.
In an embodiment of the present invention, preferably, the two-tube enhanced vapor injection outdoor unit includes: the first solenoid valve 26 is disposed between the air outlet 204 and the injection port 166, and the conducting direction of the first solenoid valve 26 is from the air outlet 204 to the injection port 166.
In this embodiment, the two-tube enhanced vapor injection outdoor unit includes the first electromagnetic valve 26, the first electromagnetic valve 26 is turned on and off, and when the first electromagnetic valve 26 is turned on, the direction of the first electromagnetic valve 26 is from the air outlet 204 to the injection port 166, that is, only the refrigerant is allowed to be turned on from the air outlet 204 to the injection port 166, so as to avoid the refrigerant backflow phenomenon.
In an embodiment of the present invention, preferably, the two-tube enhanced vapor injection outdoor unit includes: and a first check valve 28 disposed on the first pipeline 24, wherein the first check valve 28 is communicated in a direction from the outlet of the outdoor heat exchanger 10 to the throttling assembly 22.
In this embodiment, the first pipe 24 is added, the outlet of the outdoor heat exchanger 10 is connected to the throttling assembly 22, the first check valve 28 is disposed on the first pipe 24, and the first check valve 28 is added between the outlet of the outdoor heat exchanger 10 and the throttling assembly 22, so that air leakage between the outlet of the outdoor heat exchanger 10 and the throttling assembly 22 during heating is prevented, only in the cooling and main cooling mode, the refrigerant flowing out of the outlet of the outdoor heat exchanger 10 is allowed to flow into the throttling assembly 22 through the first check valve 28, and in the heating and main heating mode, the first check valve 28 is closed, so that the refrigerant flowing out of the outlet of the outdoor heat exchanger 10 cannot pass through the first pipe 24.
In an embodiment of the present invention, preferably, the two-tube enhanced vapor injection outdoor unit includes: the second check valve 30, the second check valve 30 connects the first port 12 with the liquid outlet 206, the conducting direction of the second check valve 30 is from the liquid outlet 206 to the first port 12; and a third check valve 32, wherein the third check valve 32 connects the second port 14 with the throttling assembly 22, and the communication direction of the third check valve 32 is the direction from the second port 14 to the throttling assembly 22.
In this embodiment, the two-tube enhanced vapor injection outdoor unit includes the second check valve 30, the conducting direction of the second check valve 30 is the direction from the liquid outlet 206 to the first port 12, one end of the second check valve 30 is located between the liquid outlet 206 and the inlet of the outdoor heat exchanger 10, and the other end of the second check valve 30 is connected to the first port 12. In the cooling and main cooling modes, the second check valve 30 is opened, so that the refrigerant flowing out of the liquid outlet 206 of the flash evaporator 20 flows to the first connector 12 through the second check valve 30. In the heating and main heating mode, the second check valve 30 is closed, and the refrigerant flowing out of the liquid outlet 206 of the flash evaporator 20 cannot pass through the second check valve 30 but can only pass through the inlet of the outdoor heat exchanger 10.
Further, the two-pipe enhanced vapor injection outdoor unit includes a third check valve 32, and a communication direction of the third check valve 32 is a direction from the second port 14 to the throttling assembly 22. In the heating and main heating mode, the third check valve 32 is opened, and the refrigerant flowing out of the second port 14 flows toward the throttle assembly 22 through the third check valve 32. In the cooling and main cooling modes, the third check valve 32 is closed, and the refrigerant flowing out of the first pipeline 24 can only flow to the throttling assembly 22.
In an embodiment of the present invention, preferably, the two-tube enhanced vapor injection outdoor unit includes: a fourth check valve 34, where the fourth check valve 34 connects the second port 14 with the fourth end of the reversing assembly 18, and a conduction direction of the fourth check valve 34 is a direction from the second port 14 to the fourth end of the reversing assembly 18; and a fifth one-way valve 36, wherein the fifth one-way valve 36 connects the first port 12 with the fourth end of the reversing assembly 18, and the conduction direction of the fifth one-way valve 36 is the direction from the fourth end of the reversing assembly 18 to the first port 12.
In this embodiment, the two-pipe enhanced vapor injection outdoor unit includes a fourth check valve 34 and a fifth check valve 36, the fourth check valve 34 connects the second port 14 to the fourth end of the reversing component 18, the conduction direction of the fourth check valve 34 is the direction from the second port 14 to the fourth end of the reversing component 18, the fifth check valve 36 connects the first port 12 to the fourth end of the reversing component 18, the conduction direction of the fifth check valve 36 is the direction from the fourth end of the reversing component 18 to the first port 12, when the cooling and main cooling modes are performed, the fourth check valve 34 is conducted, the fifth check valve 36 is closed, and when the heating and main heating modes are performed, the fifth check valve 36 is conducted, and the fourth check valve 34 is closed.
In an embodiment of the present invention, preferably, the two-tube enhanced vapor injection outdoor unit includes: a sixth check valve 38, wherein the sixth check valve 38 connects the third end of the reversing assembly 18 with the inlet of the outdoor heat exchanger 10, and the conduction direction of the sixth check valve 38 is from the third end of the reversing assembly 18 to the outdoor heat exchanger 10; and the seventh check valve 40, the seventh check valve 40 connects the third end of the reversing assembly 18 with the outlet of the outdoor heat exchanger 10, and the conduction direction of the seventh check valve 40 is the direction from the outlet of the outdoor heat exchanger 10 to the third end of the reversing assembly 18.
In this embodiment, the two-tube enhanced vapor injection outdoor unit includes: the sixth one-way valve 38 and the seventh one-way valve 40, the sixth one-way valve 38 and the seventh one-way valve 40 are both connected to the third end of the reversing assembly 18, the other ends of the sixth one-way valve 38 and the seventh one-way valve 40 are respectively connected to the inlet of the outdoor heat exchanger 10 and the outlet of the outdoor heat exchanger 10, the sixth one-way valve 38 is conducted and the seventh one-way valve 40 is closed during the cooling and main cooling modes, and the seventh one-way valve 40 is conducted and the sixth one-way valve 38 is closed during the heating and main heating modes.
In an embodiment of the present invention, preferably, the throttling assembly 22 includes at least one throttling device 222 and at least one eighth check valve 224 connected in parallel, and a direction of communication of the eighth check valve 224 is a direction from the second connector 14 to the refrigerant inlet 202.
In this embodiment, the throttling assembly 22 includes at least one throttling device 222 and at least one eighth check valve 224 connected in parallel, a conducting direction of the eighth check valve 224 is a direction from the second connector 14 to the refrigerant inlet 202, one throttling device 222 may be connected in parallel with one eighth check valve 224, or one throttling device 222 may be connected in parallel with a plurality of eighth check valves 224, and a plurality of throttling devices 222 are connected in parallel with one eighth check valve 224, so as to ensure a throttling and depressurizing effect, and a better depressurizing effect can be achieved after multistage depressurization.
In an embodiment of the present invention, preferably, the two-tube enhanced vapor injection outdoor unit includes: a second pipe connecting the exhaust port 162 with the first port 12; and a second solenoid valve 42 disposed on the second pipeline, wherein the conduction direction of the second solenoid valve 42 is the direction from the exhaust port 162 to the first port 12.
In this embodiment, the two-tube enhanced vapor injection outdoor unit includes a second pipeline and a second solenoid valve 42 disposed on the second pipeline, when the refrigeration mode is performed, the second solenoid valve 42 is closed, and all the refrigerants discharged from the gas outlet 162 enter the inlet of the outdoor heat exchanger 10 through the third end of the reversing assembly 18; in the main refrigeration mode, the second electromagnetic valve 42 is opened, part of the refrigerant discharged from the gas outlet 162 enters the inlet of the outdoor heat exchanger 10 through the third end of the reversing component 18, and the other part of the refrigerant enters the first interface 12 through the second electromagnetic valve 42, so that the two-pipe enhanced vapor injection multi-split system can realize the two refrigeration and main refrigeration modes.
In an embodiment of the present invention, preferably, the two-tube enhanced vapor injection outdoor unit includes: a ninth check valve 44, the ninth check valve 44 connects the inlet of the outdoor heat exchanger 10 with the liquid outlet 206, and the conducting direction of the ninth check valve 44 is the direction from the liquid outlet 206 to the inlet of the outdoor heat exchanger 10.
In this embodiment, the two-tube enhanced vapor injection outdoor unit includes the ninth check valve 44, and the conducting direction of the ninth check valve 44 is the direction from the liquid outlet 206 to the inlet of the outdoor heat exchanger 10. In the cooling and main cooling mode, the ninth check valve 44 is closed, and the refrigerant flowing out of the liquid outlet 206 of the flash evaporator 20 cannot enter the inlet of the outdoor heat exchanger 10 through the ninth check valve 44, but enters the first port 12 through the pipeline where the second check valve 30 is located. In the heating and main heating mode, the ninth check valve 44 is opened, and the refrigerant flowing out of the liquid outlet 206 of the flash evaporator 20 enters the inlet of the outdoor heat exchanger 10 through the ninth check valve 44.
According to an aspect of the present invention, a two-pipe enhanced vapor injection multiple on-line system is provided, which includes the two-pipe enhanced vapor injection outdoor units according to any of the above embodiments, and therefore, the two-pipe enhanced vapor injection multiple on-line system has all the advantages of the two-pipe enhanced vapor injection outdoor units according to any of the above embodiments.
The two-pipe enhanced vapor injection multi-split system comprises a refrigerant flow direction switching device 48, wherein the refrigerant flow direction switching device 48 comprises a gas-liquid separator 50 for shunting gas-liquid two-phase refrigerant, a plate heat exchanger is used for obtaining the supercooling degree of liquid refrigerant, and a plurality of groups of electromagnetic valves are used for switching the flow direction of the refrigerant.
As shown in fig. 3, during cooling, a high-temperature and high-pressure gaseous refrigerant from the enhanced vapor injection compressor 16 passes through the reversing component 18 and the sixth check valve 38 and is condensed by the outdoor heat exchanger 10 to be a high-pressure liquid refrigerant, a portion of the high-temperature and high-pressure gaseous refrigerant passes through the throttling component 22, is throttled and depressurized to be a two-phase refrigerant and enters the flash evaporator 20, the gaseous refrigerant passes through the first electromagnetic valve 26 and enters the injection port 166 of the enhanced vapor injection compressor 16, and the other portion of the liquid refrigerant passes through the second check valve 30 and reaches the first port 12 (output pipe) and enters the inlet of the gas-liquid separator 50 of.
As shown in fig. 4, during heating, a high-temperature and high-pressure gas refrigerant flows out of the enhanced vapor injection compressor 16, passes through two paths to the high-pressure valve via the second electromagnetic valve 42, the reversing component 18 and the fifth one-way valve 36, then flows from the high-pressure valve to the inlet of the refrigerant flow direction switching device 48 via the first interface 12 (the outer unit output pipe), enters the gas-liquid separator 50, flows from the gas-side outlet of the gas-liquid separator 50 to the two-pipe enhanced vapor injection indoor unit 46 via the heating electromagnetic valve, is condensed into a high-pressure liquid refrigerant via the two-pipe enhanced vapor injection indoor unit 46, flows through the inner unit electronic expansion valve to become a high-pressure two-phase refrigerant, flows through the throttling element (with the fully opened opening and the resistance reduced as much as possible) of the refrigerant flow direction switching device 48, returns to the second interface 14 (the outer unit input pipe) via the low-pressure valve to the two-pipe enhanced vapor injection outdoor unit, passes through, after the refrigerant comes out of the liquid outlet 206, a part of liquid refrigerant enters the outdoor heat exchanger 10 to absorb heat, then returns to the low-pressure tank through the reversing component 18, and then enters the return air port 164 of the enhanced vapor injection compressor 16; another part of the gaseous refrigerant enters the compression chamber of the enhanced vapor injection compressor 16 through the first solenoid valve 26 after exiting from the outlet 204 of the flash evaporator 20.
As shown in fig. 5, during main cooling, a part of the high-temperature and high-pressure gaseous refrigerant from the enhanced vapor injection compressor 16 passes through the reversing component 18 and the sixth check valve 38 and is condensed by the outdoor heat exchanger 10, a part of the high-pressure gaseous refrigerant passes through the throttling component 22, is throttled and depressurized into a two-phase refrigerant, enters the flash evaporator 20, the gaseous refrigerant enters the injection port 166 of the enhanced vapor injection compressor 16 through the first solenoid valve 26, and the other part of the liquid refrigerant passes through the second check valve 30 and reaches the first connector 12, and is mixed with the other part of the high-temperature and high-pressure gaseous refrigerant passing through the second solenoid valve 42 from the enhanced vapor injection compressor 16 to form a high-temperature and high-pressure two-phase refrigerant, which enters the inlet of the gas. The gaseous refrigerant flows through the heating electromagnetic valve from the gas side outlet, enters the gas pipe of the heating two-pipe jet enthalpy-increasing indoor unit 46, is condensed in the heating two-pipe jet enthalpy-increasing indoor unit 46, returns to the inlet of the second subcooler 54 of the refrigerant distribution device after passing through the throttling element of the two-pipe jet enthalpy-increasing indoor unit 46, is mixed with the liquid refrigerant after the liquid refrigerant from the liquid side outlet of the gas-liquid separator 50 is subcooled by the first subcooler 52, further subcooled by the second subcooler 54, enters the refrigerating two-pipe jet enthalpy-increasing indoor unit 46, is subjected to pressure reduction by the throttling element of the refrigerating two-pipe jet enthalpy-increasing indoor unit 46, is evaporated and absorbs heat in the refrigerating two-pipe jet enthalpy-increasing indoor unit 46, is changed into low-pressure gaseous refrigerant, and returns to the second port 14 of the two-pipe jet enthalpy-increasing outdoor. Through fourth check valve 34 and reversing component 18 back to low pressure tank ACC and then back to return port 164 of enhanced vapor injection compressor 16.
As shown in fig. 6, during heating, the high-temperature and high-pressure gas refrigerant flows from the enhanced vapor injection compressor 16, passes through the second solenoid valve 42, the reversing component 18 and the fifth check valve 36, and then flows to the high-pressure valve through the first port 12, flows to the inlet of the refrigerant flow direction switching device 48, and enters the gas-liquid separator 50. The high-pressure gaseous refrigerant enters the two-pipe enhanced vapor injection indoor unit 46 for heating from the gas outlet of the gas-liquid separator 50 through the heating electromagnetic valve and the gas pipe, the condensed high-pressure refrigerant passes through the electronic expansion valve of the two-pipe enhanced vapor injection indoor unit 46 and then flows back to the inlet of the second subcooler 54 of the refrigerant distribution device, the condensed high-pressure refrigerant becomes a high-pressure liquid refrigerant after coming out of the second subcooler 54 and enters the two-pipe enhanced vapor injection indoor unit 46 for refrigeration through the refrigeration one-way valve, the condensed high-pressure liquid refrigerant is throttled by the electronic expansion valve and then becomes a medium-pressure two-phase refrigerant, enters the two-pipe enhanced vapor injection indoor unit 46 for evaporation and heat absorption, the condensed medium-pressure two-phase refrigerant becomes a medium-pressure gaseous refrigerant and then joins the medium-pressure. The refrigerant flows out of the liquid outlet 206, enters the outdoor heat exchanger 10 through the ninth check valve 44 to be evaporated and absorb heat, then flows through the reversing assembly 18 to enter the low pressure tank, and then returns to the return air port 164 of the enhanced vapor injection compressor 16. The gaseous refrigerant flows out of the outlet 204 of the flash evaporator 20 through the first solenoid valve 26 and into the injection port 166 of the enhanced vapor injection compressor 16.
As shown in FIG. 7, the two-tube enhanced vapor injection multi-split system increases enthalpy difference (h) during coolingA-J＞hA-J’) And the same capacity can be realized by using smaller refrigerant circulation quantity, so that the frequency of the enhanced vapor injection compressor 16 can be lower, the work is less, and the energy efficiency is improved. In addition, because the two-pipe enhanced vapor injection multi-split system reduces the exhaust superheat (SH < SH'), the vapor injection can increase the refrigerant circulation amount to improve the refrigeration capacity during high-temperature refrigeration.
In the description of the present specification, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A two-pipe enhanced vapor injection outdoor unit, comprising:
the outdoor heat exchanger, the first interface and the second interface;
the enhanced vapor injection compressor comprises an exhaust port, a return air port and an injection port;
the reversing assembly comprises a first end to a fourth end, the first end of the reversing assembly is connected with the exhaust port, and the second end of the reversing assembly is connected with the air return port;
the flash evaporator comprises a refrigerant inlet, an air outlet and a liquid outlet, the air outlet is connected with the jet orifice, and the liquid outlet is respectively connected with the first interface and the inlet of the outdoor heat exchanger;
one end of the throttling component is connected with the refrigerant inlet, and the other end of the throttling component is connected with the second interface;
and one end of the first pipeline is connected with the outlet of the outdoor heat exchanger, and the other end of the first pipeline is positioned between the throttling assembly and the second connector.
2. The two-pipe enhanced vapor injection outdoor unit of claim 1,
the third end of the reversing assembly is switchably connected to the inlet of the outdoor heat exchanger or the outlet of the outdoor heat exchanger, and the fourth end of the reversing assembly is switchably connected to the second port or the first port.
3. The two-tube enhanced vapor injection outdoor unit of claim 1, wherein the two-tube enhanced vapor injection outdoor unit comprises:
the first electromagnetic valve is arranged between the air outlet and the jet orifice, and the conducting direction of the first electromagnetic valve is from the air outlet to the jet orifice.
4. The two-tube enhanced vapor injection outdoor unit of claim 1, wherein the two-tube enhanced vapor injection outdoor unit comprises:
the first check valve is arranged on the first pipeline, and the conduction direction of the first check valve is from the outlet of the outdoor heat exchanger to the direction of the throttling assembly.
5. The two-tube enhanced vapor injection outdoor unit of any one of claims 1 to 4, comprising:
the second one-way valve connects the first interface with the liquid outlet, and the conduction direction of the second one-way valve is from the liquid outlet to the first interface;
and the third one-way valve connects the second interface with the throttling component, and the conduction direction of the third one-way valve is the direction from the second interface to the throttling component.
6. The two-tube enhanced vapor injection outdoor unit of any one of claims 1 to 4, comprising:
the fourth one-way valve connects the second interface with the fourth end of the reversing assembly, and the conduction direction of the fourth one-way valve is from the second interface to the fourth end of the reversing assembly;
and the fifth one-way valve connects the first interface with the fourth end of the reversing assembly, and the conduction direction of the fifth one-way valve is from the fourth end of the reversing assembly to the first interface.
7. The two-tube enhanced vapor injection outdoor unit of any one of claims 1 to 4, comprising:
the third end of the reversing assembly is connected with the inlet of the outdoor heat exchanger through the sixth one-way valve, and the conduction direction of the sixth one-way valve is from the third end of the reversing assembly to the outdoor heat exchanger;
and the seventh check valve connects the third end of the reversing assembly with the outlet of the outdoor heat exchanger, and the conduction direction of the seventh check valve is from the outlet of the outdoor heat exchanger to the third end of the reversing assembly.
8. The two-tube enhanced vapor injection outdoor unit of any one of claims 1 to 4,
the throttling assembly comprises at least one throttling device and at least one eighth one-way valve which are connected in parallel, and the conduction direction of the eighth one-way valve is from the second connector to the refrigerant inlet.
9. The two-tube enhanced vapor injection outdoor unit of any one of claims 1 to 4, comprising:
a second pipeline connecting the exhaust port with the first interface;
and the second electromagnetic valve is arranged on the second pipeline, and the conduction direction of the second electromagnetic valve is the direction from the exhaust port to the first interface.
10. The two-tube enhanced vapor injection outdoor unit of any one of claims 1 to 4, comprising:
and the ninth one-way valve connects the inlet of the outdoor heat exchanger with the liquid outlet, and the conduction direction of the ninth one-way valve is the direction from the liquid outlet to the inlet of the outdoor heat exchanger.
11. A two-pipe enhanced vapor injection multi-split system, wherein the two-pipe enhanced vapor injection multi-split system comprises the two-pipe enhanced vapor injection outdoor unit according to any one of claims 1 to 10.
CN201811227632.6A 2018-10-22 2018-10-22 Two-pipe jet enthalpy-increasing outdoor unit and multi-split system Active CN109386983B (en)

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CN201811227632.6A CN109386983B (en) 2018-10-22 2018-10-22 Two-pipe jet enthalpy-increasing outdoor unit and multi-split system
US16/619,599 US20200173696A1 (en) 2018-10-22 2019-06-03 Two-pipe enhanced-vapor-injection outdoor unit and multi-split system
CA3065395A CA3065395A1 (en) 2018-10-22 2019-06-03 Two-pipe enhanced-vapor-injection outdoor unit and multi-split system
PCT/CN2019/089858 WO2020082739A1 (en) 2018-10-22 2019-06-03 Two-pipe system gas-injection enthalpy-increasing outdoor unit and multi-split system

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CN109386983B (en) * 2018-10-22 2020-07-28 广东美的暖通设备有限公司 Two-pipe jet enthalpy-increasing outdoor unit and multi-split system

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