CN106766333B

CN106766333B - Low-temperature jet enthalpy-increasing air conditioning system

Info

Publication number: CN106766333B
Application number: CN201710002083.1A
Authority: CN
Inventors: 魏峰; 郭春雷; 孙亚丽; 温德平
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2017-01-03
Filing date: 2017-01-03
Publication date: 2023-08-22
Anticipated expiration: 2037-01-03
Also published as: CN106766333A

Abstract

The invention provides a low-temperature jet enthalpy-increasing air conditioning system, which comprises more than two air conditioning subsystems, wherein each air conditioning subsystem comprises an outdoor heat exchanger, an indoor heat exchanger, a compressor and an economizer for supplementing air and enthalpy, the economizer is positioned between the outdoor heat exchanger and the indoor heat exchanger and comprises a low-pressure pipeline and a high-pressure pipeline which are opposite, and the outdoor heat exchanger of one air conditioning subsystem can be connected to the low-pressure pipeline of the economizer of any other air conditioning subsystem during defrosting and then connected back to the suction end of the compressor of the one air conditioning subsystem. The invention can lead the outdoor heat exchanger needing defrosting to be effectively defrosted and the indoor heat exchanger needing to be continuously heated, so that the indoor temperature can not be reduced, the comfort of the indoor environment during defrosting is effectively improved, and the comfort of the use of users is improved; the pressure fluctuation amplitude of the system is relatively small, and the mechanical impact is small.

Description

Low-temperature jet enthalpy-increasing air conditioning system

Technical Field

The invention belongs to the technical field of air conditioners, and particularly relates to a low-temperature air injection enthalpy-increasing air conditioning system.

Background

The traditional air source heat pump unit has the characteristics of refrigeration in summer and heat supply in winter, no need of installing a cooling tower, easy modularization and integration, and the like, and has been widely applied to various industrial and civil building air conditioning engineering since the beginning of the 90 th century, and the application area is widened continuously, and has been expanded from the original south China and Yangtze river basin to the yellow river basin and wide northwest region. However, due to the fact that the temperature of the Yangtze river basin and the north area thereof in winter is low or the humidity is high, the surface of the fin heat exchanger is easy to frost, fin heat exchange efficiency is affected, and therefore unit capacity and reliable operation are affected. The patent document of the issued publication number CN204943957U proposes an air-jet enthalpy-increasing air-cooled (hot) water machine set, and the system improves the heating capacity of the machine set in a low-temperature environment to a certain extent, but the following defects are also existed: 1. the system adopts reverse circulation defrosting, heat is required to be absorbed from the water side heat exchanger during defrosting, continuous heating can not be carried out during defrosting, and the use comfort of a user is affected. When the heating mode and the defrosting mode are switched at the same time, the suction pressure and the exhaust pressure of the compressor are changed severely, namely the pressure fluctuation of the system is severe, and the generated mechanical impact is relatively large; 2. when the system heats, the refrigerant is separated into two paths before entering the economizer, the liquid is taken before the economizer by the enthalpy injection loop, when the system heats at low temperature, especially at low temperature below-15 ℃, the circulation flow of the refrigerant of the system is small, at the moment, the liquid can not be taken by the liquid taking mode before the economizer by the enthalpy injection loop, so that the liquid is less in the enthalpy injection loop and even no refrigerant is caused, further, the problems of no air injection enthalpy increasing effect, high exhaust temperature of the compressor, low heating capacity and energy efficiency and the like are caused, and the operation reliability of the compressor and the low-temperature heating performance of a unit are reduced.

Because the air conditioning system in the prior art needs to absorb heat from the water side heat exchanger during reverse circulation defrosting, continuous heating cannot be performed during defrosting, user comfort is affected, mechanical impact of the system is large, the liquid extraction of the enthalpy-injection loop is insufficient during low-temperature heating, the low-temperature heating performance of the unit is low, and the like, the invention designs the low-temperature air injection enthalpy-increasing air conditioning system.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that the air conditioning system in the prior art is easy to have reduced comfort for users during defrosting, thereby providing a low-temperature air injection enthalpy-increasing air conditioning system.

The invention provides a low-temperature jet enthalpy-increasing air conditioning system, which comprises more than two air conditioning subsystems, wherein each air conditioning subsystem comprises an outdoor heat exchanger, an indoor heat exchanger, a compressor and an economizer for supplementing air and increasing enthalpy, the economizer is positioned between the outdoor heat exchanger and the indoor heat exchanger and comprises a low-pressure pipeline and a high-pressure pipeline which are opposite, and the outdoor heat exchanger of one air conditioning subsystem can be connected to the low-pressure pipeline of the economizer of any other air conditioning subsystem during defrosting, and then is connected back to the suction end of the compressor of the one air conditioning subsystem.

Preferably, in each air conditioning subsystem, a high-pressure pipeline of the economizer is connected with the indoor heat exchanger, the high-pressure pipeline and the low-pressure pipeline are converged near the outdoor heat exchanger end and then connected to the outdoor heat exchanger, and the low-pressure pipeline is connected to the air supplementing end of the compressor after passing through the economizer.

Preferably, the compressor further comprises a bypass pipeline connected with a pipeline where the high-pressure pipeline and the low-pressure pipeline meet, one end of the bypass pipeline is connected to the pipeline where the high-pressure pipeline and the low-pressure pipeline meet, and the other end of the bypass pipeline is connected to the air supplementing end of the compressor.

Preferably, the bypass pipe is further provided with a first control valve for controlling on-off of the bypass pipe.

Preferably, more than two air conditioning subsystems share one indoor heat exchanger, and each subsystem can exchange heat indoors.

Preferably, the indoor heat exchanger is a hot water heat exchanger, water enters from one end and is discharged from the other end, and heat exchange pipelines of more than two air conditioning subsystems are connected to the hot water heat exchanger and can exchange heat with the water.

Preferably, the two air conditioning subsystems are a first air conditioning subsystem and a second air conditioning subsystem respectively, and the first air conditioning subsystem and the second air conditioning subsystem share the indoor heat exchanger and can exchange heat with the indoor through the indoor heat exchanger;

The first air conditioning subsystem comprises a first compressor, a first four-way valve connected to an exhaust port of the first compressor, a first economizer and a first outdoor heat exchanger; the second air conditioning subsystem includes a second compressor and a second four-way valve coupled to a discharge of the second compressor, and a second economizer and a second outdoor heat exchanger.

Preferably, the first air conditioning subsystem comprises a first three-way valve A positioned between the first four-way valve and the indoor heat exchanger, and three ends of the first three-way valve A are respectively connected to the first ends of the first four-way valve, the indoor heat exchanger and the first outdoor heat exchanger;

and/or wherein the second air conditioning subsystem comprises a first three-way valve B located between the second four-way valve and the indoor heat exchanger, three ends of the first three-way valve B being connected to the first ends of the second four-way valve, the indoor heat exchanger and the second outdoor heat exchanger, respectively.

Preferably, a second three-way valve A is further arranged on the low-pressure outlet pipeline of the first economizer, and three ends of the second three-way valve A are respectively connected to the low-pressure outlet end of the first economizer, the air supplementing end of the first compressor and the second four-way valve of the second air conditioning subsystem;

And/or a second three-way valve B is further arranged on the low-pressure outlet pipeline of the second economizer of the second air conditioning subsystem, and three ends of the second three-way valve B are respectively connected to the low-pressure outlet end of the second economizer, the air supplementing end of the second compressor and the first four-way valve of the first air conditioning subsystem.

Preferably, a third three-way valve a is arranged at the second end of the first outdoor heat exchanger, and three ends of the third three-way valve a are respectively connected to the first four-way valve, the second end of the outdoor heat exchanger and a low-pressure inlet pipeline of a second economizer of the second air conditioning subsystem;

and/or a third three-way valve B is arranged at the second end of the second outdoor heat exchanger, and three ends of the third three-way valve B are respectively connected to the second four-way valve, the second end of the second outdoor heat exchanger and a low-pressure inlet pipeline of a first economizer of the first air conditioning subsystem.

Preferably, a second throttling device A is further arranged on the low-pressure inlet pipeline of the first economizer, and the third three-way valve B is connected to the low-pressure inlet pipeline of the first economizer and is at a position far away from the first economizer relative to the second throttling device A;

And/or a second throttling device B is further arranged on the low-pressure inlet pipeline of the second economizer, and the third three-way valve A is connected to the low-pressure inlet pipeline of the second economizer and is far away from the second economizer relative to the second throttling device B.

Preferably, three ends of a first three-way valve A of a first air conditioning subsystem are respectively connected to one ends of a second three-way valve B of the first four-way valve, the indoor heat exchanger and the second air conditioning subsystem, which are positioned on a low-pressure outlet pipeline of a second economizer;

and/or three ends of the first three-way valve B of the second air conditioning subsystem are respectively connected to the second four-way valve, the indoor heat exchanger and one end of the second three-way valve A of the first air conditioning subsystem, which is positioned on the low-pressure outlet pipeline of the first economizer.

Preferably, three ends of the second three-way valve a are connected to the first economizer low pressure outlet port, the first compressor make-up port and the first three-way valve of the second air conditioning subsystem, respectively;

and/or the three ends of the second three-way valve B are respectively connected to the low-pressure outlet end of the second economizer, the air supplementing end of the second compressor and the first three-way valve of the first air conditioning subsystem.

Preferably, a third three-way valve a is arranged at a first end of the first outdoor heat exchanger, and three ends of the third three-way valve a are respectively connected to the low-pressure inlet pipelines of the first economizer, the first end of the first outdoor heat exchanger and a second economizer of the second air conditioning subsystem;

and/or a third three-way valve B is arranged at the first end of the second outdoor heat exchanger, and three ends of the third three-way valve B are respectively connected to the low-pressure inlet pipelines of the second economizer, the first end of the second outdoor heat exchanger and the first economizer of the first air conditioning subsystem.

the low-pressure inlet pipeline of the second economizer is further provided with a second throttling device B, and the third three-way valve A is connected to the low-pressure inlet pipeline of the second economizer and is far away from the second economizer relative to the second throttling device B.

Preferably, a first throttling device A is also arranged between the indoor heat exchanger and the first economizer; and/or a first throttling device B is arranged between the indoor heat exchanger and the second economizer.

And/or a third throttling device A is arranged between the first outdoor heat exchanger and the first economizer; and/or a third throttling device B is also arranged between the second outdoor heat exchanger and the second economizer.

The low-temperature jet enthalpy-increasing air conditioning system provided by the invention has the following beneficial effects:

1. according to the low-temperature jet enthalpy-increasing air conditioning system, the outdoor heat exchanger of one air conditioning subsystem can be connected to the low-pressure pipeline of the economizer of the other air conditioning subsystem during defrosting, and then the outdoor heat exchanger is connected back to the air suction end of the compressor of the other air conditioning subsystem, so that the outdoor heat exchanger of the subsystem needing defrosting can be used as a condenser to perform exothermic defrosting when needed, the low-pressure end of the economizer of the other subsystem becomes an evaporator and performs evaporation heat absorption at the economizer, and finally returns to the compressor to form a complete cycle, normal heating of the indoor heat exchanger of the other subsystem is not influenced, and therefore the indoor heat exchanger needing defrosting is effectively performed, heating is continuously performed when the indoor heat exchanger needs to be heated, the indoor temperature is not reduced, the indoor environment comfort during defrosting is effectively improved, and the use comfort of a user is improved;

2. According to the low-temperature air injection enthalpy-increasing air conditioning system, defrosting heat of the defrosting subsystem is generated by working of the compressor and heat released by supercooling of a high-temperature liquid refrigerant of the other heating subsystem, so that energy is reasonably utilized, and meanwhile the problem that the hot gas bypass defrosting compressor is easy to suck and carry liquid can be solved;

3. the low-temperature jet enthalpy-increasing air conditioning system does not absorb heat from the side of the indoor heat exchanger, so that reverse circulation defrosting is not needed, the four-way valve is not needed to be controlled to be switched between a heating mode and a defrosting mode, the suction and exhaust changes of a compressor of the air conditioning system are not caused to be changed severely, namely the pressure fluctuation range of the compressor or the system is relatively smaller, and the mechanical impact is smaller;

4. the low-temperature jet enthalpy-increasing air conditioning system is connected with the indoor heat exchanger through the high-pressure pipeline of the economizer, the high-pressure pipeline and the low-pressure pipeline close to the outdoor heat exchanger end are converged and then connected to the outdoor heat exchanger, and the low-pressure pipeline is connected to the air supplementing end of the compressor after passing through the economizer, so that the liquid of the low-pressure pipeline is obtained after the economizer when the system heats at low temperature, namely, the liquid refrigerant after cooling and heat exchanging through the high-pressure pipeline of the economizer is more, the liquid refrigerant taking effect is better, the refrigerant in the enthalpy-injecting loop is effectively increased, the enthalpy-increasing effect without jet is not generated as much as possible, the circulating flow of the refrigerant of the system is improved, the exhaust temperature of the compressor is reduced, the heating capacity and the energy efficiency of the system are improved, especially in a low-temperature environment (preferably-15 ℃), and the operation reliability is improved;

5. According to the low-temperature jet enthalpy-increasing air conditioning system, by adding the bypass pipeline (namely the liquid spraying loop), when one subsystem is defrosted and the other subsystem is subjected to low-loop-temperature heating or both subsystems are subjected to normal low-loop-temperature heating, the situation of high exhaust temperature can possibly occur, namely, the electromagnetic valve of the liquid spraying loop can be controlled to be opened to spray liquid to reduce the exhaust temperature, and the running reliability of a unit is improved.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 3 of the low-temperature enhanced vapor injection air conditioning system of the present invention;

fig. 2 is a schematic structural diagram of embodiment 4 of the low-temperature enhanced vapor injection air conditioning system of the present invention.

The reference numerals in the drawings are as follows:

11-subsystem 1 compressor (or first compressor); 1101-suction port of subsystem 1; 1102-exhaust port of subsystem 1; 1103—the vapor injection enthalpy-increasing make-up port of subsystem 2; 12-subsystem 2 four-way valve (or first four-way valve); 13-subsystem 1 first three-way valve (or first three-way valve a); 04-is a system water side heat exchanger (shared by all subsystems) (or indoor heat exchanger); 0401-subsystem 1 is connected with the air pipe orifice of the water side heat exchanger; 0402-subsystem 1 connects the liquid pipe orifice of the water side heat exchanger; 15-subsystem 1 reservoir; 16-subsystem 1 first electronic expansion valve; 17-subsystem 1 first check valve; 18-subsystem 2 economizer (or first economizer); 1801—subsystem 1 economizer heating main line inlet (refrigeration main line outlet, or high pressure line outlet); 1802-subsystem 1 economizer heating main line outlet (refrigeration main line inlet, or high pressure line inlet); 1803-subsystem 1 economizer auxiliary line inlet (or lp line inlet); 1804-subsystem 1 economizer auxiliary line outlet (or lp line outlet); 19-subsystem 1 second three-way valve (or second three-way valve a); 110- (subsystem 1) a second electronic expansion valve (or second electronic expansion valve a); 111-subsystem 1 first solenoid valve; 112-subsystem 1 second solenoid valve; 113-subsystem 1 spray capillary; 114-subsystem 1 second check valve; 115-subsystem 1 third check valve; 116—a third electronic expansion valve of subsystem 1 (or third electronic expansion valve a); 117—a fourth check valve of subsystem 1; 118-subsystem 1 air heat exchanger on the wind side (or first outdoor heat exchanger), 11801-subsystem 1 air heat exchanger air nozzle, 11802-subsystem 1 air heat exchanger liquid nozzle; 119-subsystem 1 third three-way valve a; 120-subsystem 1 gas-liquid separator; 12001-subsystem 1 gas-liquid separator inlet; 12002-subsystem 1 gas-liquid separator outlet.

21-subsystem 2 compressor (or second compressor); 2101-subsystem 2 compressor suction, 2102-subsystem 2 compressor discharge; 2103-an enthalpy-increasing air injection port of a subsystem 2 compressor; 22-subsystem 2 four-way valve (or first four-way valve); 23-subsystem 2 first three-way valve; 04-a system water side heat exchanger (shared by all subsystems) (or called indoor heat exchanger), 0403-a subsystem 2 is connected with a water side heat exchanger air pipe orifice; 0404-subsystem 2 connects the liquid pipe orifice of the water side heat exchanger; 25-subsystem 2 reservoir; 26-subsystem 2 first electronic expansion valve; 27-subsystem 2 first check valve; 28-subsystem 2 economizer (or second economizer); 2801-subsystem 2 economizer heating main line inlet (refrigeration main line outlet, or high pressure line outlet); 2802-subsystem 2 economizer heating main line outlet (refrigeration main line inlet, or high pressure line inlet); 2803-subsystem 2 economizer auxiliary line inlet (or lp line inlet), 2804-subsystem 2 economizer auxiliary line outlet (or lp line outlet); 29-subsystem 2 second three-way valve (or second three-way valve B); 210-subsystem 2 second electronic expansion valve (or second electronic expansion valve B); 211-subsystem 2 first solenoid valve (or first solenoid valve B); 212-subsystem 2 second solenoid valve (or second solenoid valve B); 213—subsystem 2 spray capillary; 214-subsystem 2 second check valve; 215-subsystem 2 third check valve; 216—a third electronic expansion valve of subsystem 2 (or third electronic expansion valve B); 217-subsystem 2 fourth check valve; 218-subsystem 2 wind side air heat exchanger (or second outdoor heat exchanger); 21801-subsystem 2 wind side air heat exchanger nozzle; 21802-subsystem 2 air heat exchanger liquid nozzle; 219-subsystem 2 third three-way valve (or third three-way valve B); 220-subsystem 2 gas-liquid separator, 22001-subsystem 2 gas-liquid separator inlet, 22002-subsystem 2 gas-liquid separator outlet.

Detailed Description

In the present invention, "outdoor heat exchanger" and "indoor heat exchanger" are only functionally expressed, and an indoor heat exchanger is understood to be a heat exchanger that acts (cools or heats) indoors, and an outdoor heat exchanger is understood to be a heat exchanger that absorbs or dissipates heat to or from outdoors, and does not refer to a specific installation location indoors or outdoors. In a small-sized domestic air-cooled heat pump hot and cold water unit or an air conditioner, an indoor heat exchanger is arranged indoors, and an outdoor heat exchanger is arranged outdoors. However, since the large-scale commercial air-cooled heat pump water chiller-heater unit is generally an integral unit, and is integrally installed outdoors, the indoor and outdoor units are not separated from each other from the installation position, in the large-scale commercial air-cooled heat pump water chiller-heater unit, the air side heat exchanger corresponds to the outdoor heat exchanger, the water side heat exchanger corresponds to the indoor heat exchanger, and the water side heat exchanger exchanges heat with the indoor through the cold and hot water pipeline, thereby refrigerating and heating the indoor.

Example 1

As shown in fig. 1-2, the present invention provides a low temperature jet enthalpy increasing air conditioning system comprising more than two air conditioning subsystems, each of which comprises an outdoor heat exchanger, an indoor heat exchanger, a compressor, and an economizer for replenishing air and enthalpy, the economizer being located between the outdoor heat exchanger and the indoor heat exchanger and comprising opposite low pressure and high pressure lines (i.e., the low pressure line is relatively lower in pressure than the high pressure line), and wherein the outdoor heat exchanger of one air conditioning subsystem is capable of connecting the outdoor heat exchanger thereof to the low pressure line of the economizer of any other air conditioning subsystem during defrosting and then back to the suction side of the compressor of the one air conditioning subsystem.

The outdoor heat exchanger of one air conditioning subsystem can be connected to the low-pressure pipeline of the economizer of the other air conditioning subsystem during defrosting, and then connected back to the air suction end of the compressor of the other air conditioning subsystem, so that the outdoor heat exchanger of the subsystem to be defrosted can be used as a condenser for exothermic defrosting when required, the low-pressure end of the economizer of the other subsystem becomes an evaporator, evaporation and heat absorption are carried out at the economizer, and finally the evaporator returns to the compressor to form a complete cycle, so that the indoor heat exchanger to be defrosted effectively and the indoor heat exchanger to be heated continuously can be heated, the indoor temperature is not reduced, the indoor environment comfort during defrosting is effectively improved, and the use comfort of users is improved;

because defrosting heat of the defrosting subsystem is generated by the compressor and heat emitted by the other heating subsystem during supercooling of the high-temperature liquid refrigerant, energy is reasonably utilized, and meanwhile, the problem that the hot gas bypass defrosting compressor is easy to suck and carry liquid can be solved (the hot gas bypass defrosting refers to that the exhaust gas of the compressor directly enters a wind side fin heat exchanger to be condensed through a hot gas bypass valve and then directly enters a vapor-liquid separator without evaporation, and the flow of the application is 11-1102-12D-12C-1303-13-1302-11802-118-11801-11902-119-11901-12E-12S-12001-120-12002-1101-11, compared with the hot gas bypass defrosting and sucking liquid provided by the application, the flow of the application is lower); because the indoor heat exchanger side does not absorb heat, reverse circulation defrosting is not needed, the four-way valve is not needed to be controlled to be switched between a heating mode and a defrosting mode, the air suction and exhaust changes of a compressor of an air conditioning system are not caused to be changed severely, namely the pressure fluctuation amplitude of the compressor or the system is relatively small, the mechanical impact is small (especially when the indoor heat exchanger is a water heater, the indoor heat exchanger does not absorb heat from the water side heat exchanger during defrosting, and meanwhile, the heating subsystem can continuously heat during normal heating, the water temperature fluctuation is small, and the user experience is good).

The high-pressure pipeline of the economizer is connected with the indoor heat exchanger, the high-pressure pipeline and the low-pressure pipeline are connected to the outdoor heat exchanger after being converged near the outdoor heat exchanger, and the low-pressure pipeline is connected to the air supplementing end of the compressor after passing through the economizer, so that the liquid of the low-pressure pipeline is obtained after the economizer when the system heats at low temperature, namely, the liquid refrigerant is the refrigerant after cooling and heat exchanging through the high-pressure pipeline of the economizer, the liquid refrigerant is more, the liquid taking effect is better, the refrigerant in the enthalpy-injecting loop is effectively increased, the enthalpy-increasing effect without air injection is not generated as much as possible, the circulating flow of the refrigerant of the system is improved, the exhaust temperature of the compressor is reduced, the heating capacity and the energy efficiency of the system are improved, and the operation reliability is improved, especially in a low-temperature environment (preferably-15 ℃).

Preferably, the compressor further comprises a bypass pipeline connected with a pipeline where the high-pressure pipeline and the low-pressure pipeline meet, one end of the bypass pipeline is connected to the pipeline where the high-pressure pipeline and the low-pressure pipeline meet, and the other end of the bypass pipeline is connected to the air supplementing end of the compressor. Through increasing bypass line (hydrojet return circuit promptly), when one subsystem defrosting heats simultaneously another subsystem low ring temperature heats or two subsystems are normal low ring temperature heats, can appear high exhaust temperature condition, can control hydrojet return circuit solenoid valve and open and spray the hydrojet and reduce exhaust temperature, improves unit operational reliability.

Preferably, the bypass pipe is further provided with a first control valve 111 (preferably a first electromagnetic valve) and a liquid spraying capillary 113 for controlling the on-off of the bypass pipe. The bypass line can be effectively opened or closed by the first control valve, and the pressure of the refrigerant can be reduced to the middle pressure of the air supplementing of the compressor by the pressure reducing action of the liquid spraying capillary tube, so that liquid spraying into the compressor can be smoothly realized (the pressure of the liquid spraying device is higher than the pressure of the air supplementing enthalpy increasing pressure because the pressure of the liquid spraying device is not throttled and reduced).

Preferably, more than two air conditioning subsystems share one indoor heat exchanger, and each subsystem can exchange heat indoors. Through common indoor heat exchanger can also have another subsystem to this common indoor heat exchanger exothermic effect when making different subsystems defrosting, make it be unlikely to the emergence that leads to the condition of indoor temperature to drop because of the subsystem of defrosting, improve indoor comfort level when defrosting.

Preferably, the indoor heat exchanger is a hot water heat exchanger, water enters from one end and is discharged from the other end, and heat exchange pipelines of more than two air conditioning subsystems are connected to the hot water heat exchanger and can exchange heat with the water to prepare hot water. The indoor heat exchanger is a preferable structural form of the indoor heat exchanger, so that hot water can be effectively prepared for domestic hot water.

Example 2

The embodiment is a further preferred scheme based on embodiment 1, that is, the two air conditioning subsystems are a first air conditioning subsystem and a second air conditioning subsystem, and the first air conditioning subsystem and the second air conditioning subsystem share the indoor heat exchanger and can exchange heat with the indoor through the indoor heat exchanger;

the first air conditioning subsystem includes a first compressor 11 and a first four-way valve 12 connected to the first compressor discharge, and a first economizer 18 and a first outdoor heat exchanger 118; the second air conditioning subsystem includes a second compressor 21 and a second four-way valve 22 coupled to the second compressor discharge, as well as a second economizer 28 and a second outdoor heat exchanger 218.

The mode of adopting two subsystems for a room heat exchanger is shared between the two, makes two subsystems obtain reasonable utilization, and two can heat simultaneously, refrigerate simultaneously, and another subsystem heats the room heat exchanger when one defrosting, thereby still keeping the effect of heating in the room when effectively guaranteeing the defrosting, preventing room temperature or hot water temperature from reducing, improving indoor comfort level.

Preferably, a first throttling device A (comprising a first electronic expansion valve A16 connected in parallel and a first check valve A17 connected in parallel and allowing only fluid to flow from the indoor heat exchanger to the economizer) is also arranged between the indoor heat exchanger 04 and the first economizer 18; and/or a first throttling device B (comprising a first electronic expansion valve B26 connected in parallel and a first non-return valve B27 connected in parallel thereto, allowing only the flow from the indoor heat exchanger to the economizer) is also provided between the indoor heat exchanger 04 and the second economizer 28.

And/or a third throttling means a (comprising a third electronic expansion valve a116 in parallel and a fourth check valve a117 in parallel allowing fluid to flow only from the outdoor heat exchanger to the economizer) is also provided between the first outdoor heat exchanger 118 and the first economizer 18; and/or a third throttling means B (comprising a third electronic expansion valve B216 in parallel and a fourth check valve B217 in parallel therewith, flowing only from the outdoor heat exchanger to the economizer) is also provided between the second outdoor heat exchanger 218 and the second economizer 28. The invention is a structure and a device with throttling and depressurization functions, which realizes closed circulation of refrigeration or heating.

Example 3

As shown in fig. 1, this embodiment is a further improvement on the basis of embodiment 2, wherein the first air conditioning subsystem includes a first three-way valve a13 located between the first four-way valve 12 and the indoor heat exchanger 04, three ends of the first three-way valve a13 being connected to first ends of the first four-way valve 12, the indoor heat exchanger 04 and the first outdoor heat exchanger 118, respectively;

and/or wherein the second air conditioning subsystem comprises a first three-way valve B23 located between the second four-way valve 22 and the indoor heat exchanger 04, three ends of the first three-way valve B23 being connected to first ends of the second four-way valve 22, the indoor heat exchanger 04 and the second outdoor heat exchanger 218, respectively.

This is the position and arrangement form of the first three-way valves a and B of embodiment 3 of the present invention, and the control actions of the interconnection and the mutual switching between the first and second outdoor heat exchangers, the indoor heat exchangers, and the first and second four-way valves can be effectively achieved through the first three-way valves a and B, providing conditions for achieving the switching control.

Preferably, a second three-way valve a19 is further disposed on the low pressure outlet line of the first economizer 18, and three ends of the second three-way valve a19 are respectively connected to the low pressure outlet port of the first economizer, the air supplementing port 1103 of the first compressor and the second four-way valve 22 of the second air conditioning subsystem;

And/or, a second three-way valve B29 is further arranged on the low-pressure outlet pipeline of the second economizer 28 of the second air conditioning subsystem, and three ends of the second three-way valve B29 are respectively connected to the low-pressure outlet end of the second economizer 28, the air supplementing end 2103 of the second compressor and the first four-way valve 12 of the first air conditioning subsystem.

This is the position and arrangement of the second three-way valves a and B of embodiment 3 of the present invention, and the control actions of the first and second economizers, the first and second compressor air-supplementing ends, and the second and first four-way valves, which are interconnected and switched with each other, can be effectively achieved through the first three-way valves a and B, providing conditions for achieving the switching control.

Preferably, a third three-way valve a119 is provided at a second end of the first outdoor heat exchanger 118, and three ends of the third three-way valve a119 are connected to the first four-way valve 12, the second end of the outdoor heat exchanger, and a low pressure inlet line of a second economizer 28 of the second air conditioning subsystem, respectively;

and/or a third three-way valve B219 is provided at a second end of the second outdoor heat exchanger 218, and three ends of the third three-way valve B219 are connected to the second four-way valve 22, the second end of the second outdoor heat exchanger, and a low pressure inlet line of the first economizer 18 of the first air conditioning subsystem, respectively.

This is the position and arrangement form of the third three-way valves a and B of embodiment 3 of the present invention, by which the control actions of the interconnection and the mutual switching between the low-pressure inlet lines of the first and second outdoor heat exchangers, the second and first economizers, and the first and second four-way valves can be effectively achieved, providing conditions for achieving the switching control.

Preferably, a second throttling device a110 (preferably an electronic expansion valve) is further arranged on the low-pressure inlet pipeline of the first economizer 18, and the third three-way valve B219 is connected to the low-pressure inlet pipeline of the first economizer at a position far away from the first economizer 18 relative to the second throttling device a 110;

and/or a second throttling device B210 (preferably an electronic expansion valve) is further arranged on the low pressure inlet line of the second economizer 28, and the third three-way valve a119 is connected to the low pressure inlet line of the second economizer at a position remote from the second economizer 28 relative to the second throttling device B210.

The position and arrangement form of the second throttling devices A and B in the embodiment 3 of the invention can throttle and decompress the refrigerant through the second throttling devices A and B, throttle and decompress the refrigerant from the first subsystem through the second throttling device B of the second subsystem and enter the economizer to evaporate and absorb heat, thereby effectively completing the circulation process of the refrigerant and realizing the defrosting process of the first outdoor heat exchanger; and the refrigerant from the second subsystem is throttled and depressurized by the second throttling device A of the first subsystem and enters the economizer to evaporate and absorb heat, so that the circulation process of the refrigerant is effectively completed, and the defrosting process of the second outdoor heat exchanger is realized.

The specific working process and principle of the embodiment are as follows:

the three-way valve is used for connecting and disconnecting the third end of the three-way valve. Taking the first three-way valve 13 of the subsystem 1 as an example, the following is described: when the 1301 end and the 1302 end are connected, the 1303 end is disconnected; when the 1301 end and the 1303 end are communicated, the 1302 end is disconnected; when the 1302 and 1303 ends are connected, the 1301 end is disconnected. The rest and so on.

The unit has three basic modes of refrigeration, heating and defrosting, and the circulation flow of each mode is described as follows:

1. refrigeration cycle:

when refrigerating: the end D and the end E of the four-way valve 12 of the subsystem 1 are communicated, the end S and the end C are communicated, the end 11901 and the end 11902 of the third three-way valve 119 of the subsystem 1 are communicated, the third electronic expansion valve 116 of the subsystem 1 is closed, the first electromagnetic valve 111 of the subsystem 1 is opened, the second electromagnetic valve 112 of the subsystem 1 is controlled to be opened according to whether the exhaust temperature is controlled to be opened during the operation of the unit (for example, the exhaust temperature is opened when the exhaust temperature is higher than a first set value and is closed when the exhaust temperature is lower than a second set value, a specific control method is omitted here), the second electronic expansion valve 110 of the subsystem 1 is opened and regulated, the end 1902 and the end 1903 of the second three-way valve 19 of the subsystem 1 are communicated, the first electronic expansion valve 16 of the subsystem 1 is opened and regulated, and the end 1301 and the end 1303 of the first three-way valve 13 of the subsystem 1 are communicated; the end D and the end E of the four-way valve 22 of the subsystem 2 are communicated, the end S and the end C are communicated, the end 21901 and the end 21902 of the third three-way valve 219 of the subsystem 2 are communicated, the third electronic expansion valve 216 of the subsystem 1 is closed, the first electromagnetic valve 211 of the subsystem 2 is opened, the second electromagnetic valve 212 of the subsystem 2 is controlled to be opened according to whether the exhaust temperature is controlled to be opened during the operation of the unit (for example, the exhaust temperature is opened when the exhaust temperature is higher than a first set value and is closed when the exhaust temperature is lower than a second set value, a specific control method is omitted here), the second electronic expansion valve 210 of the subsystem 2 is opened and regulated, the end 2902 and the end 2903 of the third three-way valve 29 of the subsystem 2 are communicated, the second electronic expansion valve 26 of the subsystem 2 is opened and regulated, and the end 2301 and the end 2303 of the first three-way valve 23 of the subsystem 2 are communicated; the two subsystems are mutually independent for refrigeration during refrigeration.

Refrigeration cycle refrigerant cycle flow:

refrigeration main circuit:

subsystem 1:12002→1101→11→1102→12d→12e→11901→119→11902→11801→118→11802→117→1802→ 18→1801→16→15→0402→04→0401→1301→13→1303→12c→12s→12001→120→12002;

subsystem 2:22002→2101→21→2102→22d→22e→21901→219→21902→21801→218→21802→217→2802→ 28- & gt 2801- & gt 26- & gt 25- & gt 0404- & gt 04- & gt 0403- & gt 2301- & gt 23- & gt 2303- & gt 22C- & gt 22S- & gt 22001- & gt 220- & gt 22002.

Refrigeration jet enthalpy-increasing loop:

subsystem 1: 1103- > 11- > 1102- > 12D- > 12E- > 11901- > 119- > 11902- > 11801- > 118- > 11802- > 117- > 111- > 110- > 1803- > 18- > 1804- > 1902- > 19- > 1903- > 114- > 115- > 1103- > and;

subsystem 2:2103→21→2102→22d→22e→21901→219→21902→21801→218→21802→ 217- & gt 211- & gt 210- & gt 2803- & gt 28- & gt 2804- & gt 2902- & gt 29- & gt 2903- & gt 214- & gt 215- & gt 2103.

Refrigeration hydrojet return circuit:

subsystem 1: 1103- > 11- > 1102- > 12D- > 12E- > 11901- > 119- > 11902- > 11801- > 118- > 11802- > 117- > 112- > 113- > 115- > 1103- > and;

subsystem 2:2103→21→2102→22d→22e→21901→219→21902→ 21801→218→21802→217→212→213→215→2103.

2. Heating cycle:

when heating, the method comprises the following steps: the end D and the end C of the four-way valve 12 of the subsystem 1 are communicated, the end S and the end E are communicated, the end 11901 and the end 11902 of the third three-way valve 119 of the subsystem 1 are communicated, the third electronic expansion valve 116 of the subsystem 1 is opened and regulated, the first electromagnetic valve 111 of the subsystem 1 is opened, the second electromagnetic valve 112 of the subsystem 1 is opened according to whether the exhaust temperature control is opened in the running process of the unit (for example, the exhaust temperature is opened when the exhaust temperature is higher than a first set value and closed when the exhaust temperature is lower than a second set value, the specific control method is omitted here), the second electronic expansion valve 110 of the subsystem 1 is opened and regulated, the end 1902 and the end 1903 of the second three-way valve 19 of the subsystem 1 are communicated, the first electronic expansion valve 16 of the subsystem 1 is closed, and the end 1301 and the end 1303 of the first three-way valve 13 of the subsystem 1 are communicated; the end D and the end C of the four-way valve 22 of the subsystem 2 are communicated, the end S and the end E are communicated, the end 21901 and the end 21902 of the third three-way valve 219 of the subsystem 2 are communicated, the third electronic expansion valve 216 of the subsystem 1 is opened and regulated, the first electromagnetic valve 211 of the subsystem 2 is opened, the second electromagnetic valve 212 of the subsystem 2 is opened according to whether the exhaust temperature control is opened during the operation of the unit (for example, the exhaust temperature is opened when the exhaust temperature is higher than a first set value and closed when the exhaust temperature is lower than a second set value, the specific control method is omitted here), the second electronic expansion valve 210 of the subsystem 2 is opened and regulated, the end 2902 and the end 2903 of the second three-way valve 29 of the subsystem 2 are communicated, the second electronic expansion valve 26 of the subsystem 2 is closed, and the end 2301 and the end 2303 of the first three-way valve 23 of the subsystem 2 are communicated; and during heating, the two subsystems heat independently.

Heating cycle refrigerant circulation flow:

heating main loop:

subsystem 1:12002→1101→11→1102→12d→12c→1303→13→1301→0401→04→0402→15→17→1801→ 18→1802→116→11802→118→11801→11902→119→11901→12e→12s→12001→120→12002;

subsystem 2:22002→2101→21→2102→22d→22c→2303→23→2301→0403→04→0404→25→27→2801→ 28- & gt 2802- & gt 216- & gt 21802- & gt 218- & gt 21801- & gt 21902- & gt 219- & gt 21901- & gt 22E- & gt 22S- & gt 22001- & gt 220- & gt 22002.

Heating jet enthalpy increasing loop:

subsystem 1: 1103- > 11- > 1102- > 12D- > 12C- > 1303- > 13- > 1301- > 0401- > 04- > 0402- > 15- > 17- > 1801- > 18- > 1802- > 111- > 110- > 1803- > 18- > 1804- > 1902- > 19- > 1903- > 114- > 115- > 1103- > and;

subsystem 2:2103, 21, 2102, 22D, 22C, 2303, 23, 2301, 0403, 04, 0404, 25, 27, 2801 28→2802→211→210→2803→28→2804→2902→29→2903→214→215→2103.

Heating hydrojet return circuit:

subsystem 1: 1103- > 11- > 1102- > 12D- > 12C- > 1303- > 13- > 1301- > 0401- > 04- > 0402- > 15- > 17- > 1801- > 18- > 1802- > 112- > 113- > 115- > 1103- > and;

subsystem 2:2103→21→2102→22d→22c→2303→23→2301→0403→04→ 0404→25→27→2801→28→2802→212→213→215→2103.

3. Defrosting cycle:

(1) Subsystem 1 defrost, subsystem 2 heat

The end D and the end C of the four-way valve 12 of the subsystem 1 are communicated, the end S and the end E are communicated, the end 11902 of the third three-way valve 119 of the subsystem 1 is communicated with the end 11903, the third electronic expansion valve 116 of the subsystem 1 is closed, the first electromagnetic valve 111 of the subsystem 1 is closed, the second electromagnetic valve 112 of the subsystem 1 is closed, the second electronic expansion valve 110 of the subsystem 1 is closed, the first electronic expansion valve 16 of the subsystem 1 is closed, and the ends 1302 and 1303 of the first three-way valve 13 of the subsystem 1 are communicated; the end D and the end C of the four-way valve 22 of the subsystem 2 are communicated, the end S and the end E are communicated, the end 21901 and the end 21902 of the third three-way valve 219 of the subsystem 2 are communicated, the third electronic expansion valve 216 of the subsystem 2 is opened and regulated, the first electromagnetic valve 211 of the subsystem 2 is closed, the second electromagnetic valve 212 of the subsystem 2 is opened according to whether the exhaust temperature control is opened during the operation of the unit (for example, the exhaust temperature is opened when the exhaust temperature is higher than a first set value and is closed when the exhaust temperature is lower than a second set value, a specific control method is omitted here), the second electronic expansion valve 210 of the subsystem 2 is opened and regulated, the end 2902 and the end 2901 of the second three-way valve 29 of the subsystem 2 are communicated, the second electronic expansion valve 26 of the subsystem 2 is closed, and the end 2301 and the end 2303 of the first three-way valve 23 of the subsystem 2 are communicated;

Subsystem 1 defrost cycle refrigerant cycle flow: 12002→1101→11→1102→12d→12c→1303→13→1302→11802→118→11801→11902→119 11903, 210, 2803, 28, 2804, 2902, 29, 2901, 12E, 12S, 12001, 120, 12002; subsystem 2 heating refrigerant cycle flow: 22002→2101→21→2102→22d→22c→2303→23→2301→0403→04→0404→25→27→2801→ 28- & gt 2802- & gt 216- & gt 21802- & gt 218- & gt 21801- & gt 21902- & gt 219- & gt 21901- & gt 22E- & gt 22S- & gt 22001- & gt 220- & gt 22002; subsystem 2 heating hydrojet circuit: 2103→21→2102→22d→22c→2303→23→2301→0403→04→ 0404→25→27→2801→28→2802→212→213→215→2103.

(2) Subsystem 2 defrost, subsystem 1 heat

The end D and the end C of the four-way valve 22 of the subsystem 2 are communicated, the end S and the end E are communicated, the end 21902 of the third three-way valve 219 of the subsystem 2 is communicated with the end 21903, the third electronic expansion valve 216 of the subsystem 2 is closed, the first electromagnetic valve 211 of the subsystem 2 is closed, the second electromagnetic valve 212 of the subsystem 2 is closed, the second electronic expansion valve 210 of the subsystem 2 is closed, the first electronic expansion valve 26 of the subsystem 2 is closed, and the ends 2302 and 2303 of the first three-way valve 23 of the subsystem 2 are communicated; the end D and the end C of the four-way valve 22 of the subsystem 1 are communicated, the end S and the end E are communicated, the end 11901 and the end 11902 of the third three-way valve 119 of the subsystem 1 are communicated, the third electronic expansion valve 116 of the subsystem 1 is opened and regulated, the first electromagnetic valve 111 of the subsystem 1 is closed, the second electromagnetic valve 112 of the subsystem 1 is controlled to be opened according to whether the exhaust temperature is controlled to be opened during the operation of the unit (for example, the exhaust temperature is opened when the exhaust temperature is higher than a first set value and is closed when the exhaust temperature is lower than a second set value, a specific control method is omitted here), the second electronic expansion valve 110 of the subsystem 1 is opened and regulated, the end 1902 and the end 1901 of the second three-way valve 19 of the subsystem 1 are communicated, the second electronic expansion valve 16 of the subsystem 1 is closed, and the end 1301 and the end 1303 of the first three-way valve 13 of the subsystem 1 are communicated;

Subsystem 2 defrost cycle refrigerant cycle flow: 22002→2101→21→2102→22d→22c→2303→23→2302→21802→218→21801→21902→219 21903, 110, 1803, 18, 1804, 1902, 19, 1901, 22E, 22S, 22001, 220, 22002; subsystem 1 heating refrigerant cycle flow: 12002→1101→11→1102→12d→12c→1303→13→1301→0401→04→0402→15→17→1801→ 18→1802→116→11802→118→11801→11902→119→11901→12e→12s→12001→120→12002; subsystem 1 heating hydrojet circuit: 1103- > 11- > 1102- > 12D- > 12C- > 1303- > 13- > 1301- > 0401- > 04- > 0402- > 15- > 17- > 1801- > 18- > 1802- > 112- > 113- > 115- > 1103- > and.

Example 4

As shown in fig. 2, this embodiment is a further improvement on the basis of embodiment 2, and belongs to an alternative embodiment of embodiment 3, wherein the first air conditioning subsystem includes a first three-way valve a13 located between the first four-way valve 12 and the indoor heat exchanger 04, and three ends of the first three-way valve a13 are connected to one end 2901 of a second three-way valve B29 of the first four-way valve 12, the indoor heat exchanger 04 and the second air conditioning subsystem, which is located on a low pressure outlet line of the second economizer 28, respectively;

And/or wherein the second air conditioning subsystem comprises a first three-way valve B23 located between the second four-way valve 22 and the indoor heat exchanger 04, three ends of the first three-way valve B23 being connected to one end 1901 of the second four-way valve 22, the indoor heat exchanger 04 and a second three-way valve a19 of the first air conditioning subsystem located on the low pressure outlet line of the first economizer 18, respectively.

This is the position and arrangement form of the first three-way valves a and B of embodiment 4 of the present invention, and the control actions of the interconnection and the mutual switching between the first and second outdoor heat exchangers, the indoor heat exchangers, and the first and second four-way valves can be effectively achieved through the first three-way valves a and B, providing conditions for achieving the switching control.

Preferably, a second three-way valve a19 is further disposed on the low pressure outlet line of the first economizer 18, and three ends of the second three-way valve a19 are connected to the low pressure outlet end of the first economizer 18, the air supplementing end 1103 of the first compressor and the first three-way valve 23 of the second air conditioning subsystem, respectively;

and/or, a second three-way valve B29 is further arranged on the low-pressure outlet pipeline of the second economizer 28 of the second air conditioning subsystem, and three ends of the second three-way valve B29 are respectively connected to the low-pressure outlet end of the second economizer 28, the air supplementing end 2103 of the second compressor and the first three-way valve 23 of the first air conditioning subsystem.

This is the position and arrangement of the second three-way valves a and B of embodiment 4 of the present invention, and the control actions of the first and second economizers, the first and second compressor air-supplementing ends, and the first three-way valves B and a, which are connected to each other, and switching to each other can be effectively achieved through the first three-way valves a and B, providing conditions for achieving switching control.

Preferably, a first end of the first outdoor heat exchanger 118 is provided with a third three-way valve a119, and three ends of the third three-way valve a119 are connected to the low pressure inlet lines of the first economizer 18, the first end of the first outdoor heat exchanger, and the second economizer 28 of the second air conditioning subsystem, respectively;

and/or a first end of the second outdoor heat exchanger 218 is provided with a third three-way valve B219, and three ends of the third three-way valve B219 are connected to the second economizer 28, the first end of the second outdoor heat exchanger, and a low pressure inlet line of the first economizer 18 of the first air conditioning subsystem, respectively.

This is the position and arrangement form of the third three-way valves a and B of embodiment 4 of the present invention, by which the control actions of the interconnection and the mutual switching between the low-pressure inlet lines of the first and second outdoor heat exchangers, the second and first economizers, and the first and second economizers can be effectively achieved, providing conditions for achieving the switching control.

a second restriction B210 (preferably an electronic expansion valve) is also provided in the low pressure inlet line of the second economizer 28, and the third three-way valve a119 is connected to the low pressure inlet line of the second economizer at a location remote from the second economizer 28 relative to the second restriction B210.

The position and arrangement form of the second throttling devices A and B in the embodiment 4 of the invention can throttle and decompress the refrigerant through the second throttling devices A and B, throttle and decompress the refrigerant from the first subsystem through the second throttling device B of the second subsystem and enter the economizer to evaporate and absorb heat, thereby effectively completing the circulation process of the refrigerant and realizing the defrosting process of the first outdoor heat exchanger; and the refrigerant from the second subsystem is throttled and depressurized by the second throttling device A of the first subsystem and enters the economizer to evaporate and absorb heat, so that the circulation process of the refrigerant is effectively completed, and the defrosting process of the second outdoor heat exchanger is realized.

The specific working process and principle of the embodiment are as follows:

in fig. 2, 11 is a subsystem 1 compressor, 1101 is a subsystem 1 compressor suction port, 1102 is a subsystem 1 compressor discharge port, 1103 is a subsystem 1 compressor vapor injection enthalpy-increasing air supply port; 12 is a subsystem 1 four-way valve; 13 is a first three-way valve of the subsystem 1; 04 is a system water side heat exchanger (shared by all subsystems), 0401 is a subsystem 1 connected with a gas pipe orifice of the water side heat exchanger, and 0402 is a subsystem 1 connected with a liquid pipe orifice of the water side heat exchanger; 15 is subsystem 1 reservoir; 16 is the first electronic expansion valve of subsystem 1; 17 is a first one-way valve of subsystem 1; 18 is subsystem 1 economizer, 1801 is subsystem 1 economizer heating main path inlet (refrigeration main path outlet), 1802 is subsystem 1 economizer heating main path outlet (refrigeration main path inlet), 1803 is subsystem 1 economizer auxiliary path inlet, 1804 is subsystem 1 economizer auxiliary path outlet; 19 is a subsystem 1 second three-way valve; 110 is a second electronic expansion valve of subsystem 1; 111 is the subsystem 1 first solenoid valve; 112 is subsystem 1 second solenoid valve; 113 is subsystem 1 spray capillary; 114 is a subsystem 1 second check valve; 115 is the third check valve of subsystem 1; 116 is a third electronic expansion valve of subsystem 1; 117 is the fourth check valve of subsystem 1; 119 is the third three-way valve of subsystem 1; 118 is subsystem 1 air heat exchanger, 11801 is subsystem 1 air heat exchanger air nozzle, 11802 is subsystem 1 air heat exchanger liquid nozzle; 120 is the subsystem 1 gas-liquid separator, 12001 is the subsystem 1 gas-liquid separator inlet, 12002 is the subsystem 1 gas-liquid separator outlet.

In fig. 2, 21 is a subsystem 2 compressor, 2101 is a subsystem 2 compressor suction port, 2102 is a subsystem 2 compressor discharge port, and 2103 is a subsystem 2 compressor vapor injection enthalpy-increasing air supply port; 22 is subsystem 2 four-way valve; 23 is a subsystem 2 first three-way valve; 04 is a system water side heat exchanger (shared by all subsystems), 0403 is a subsystem 2 connected with a gas pipe orifice of the water side heat exchanger, and 0404 is a subsystem 2 connected with a liquid pipe orifice of the water side heat exchanger; 25 is subsystem 2 reservoir; 26 is a first electronic expansion valve of subsystem 2; 27 is a subsystem 2 first one-way valve; 28 is subsystem 2 economizer, 2801 is subsystem 2 economizer heating main path inlet (refrigeration main path outlet), 2802 is subsystem 2 economizer heating main path outlet (refrigeration main path inlet), 2803 is subsystem 2 economizer auxiliary path inlet, 2804 is subsystem 2 economizer auxiliary path outlet; 29 is subsystem 2 second three-way valve; 210 is a subsystem 2 second electronic expansion valve; 211 is a subsystem 2 first solenoid valve; 212 is subsystem 2 second solenoid valve; 213 subsystem 2 spray capillary; 214 is subsystem 2 second check valve; 215 is subsystem 2 third check valve; 216 is a third electronic expansion valve of subsystem 2; 217 is a subsystem 2 fourth check valve; 219 is subsystem 2 third three-way valve; 218 is subsystem 2 wind side air heat exchanger, 21801 is subsystem 2 wind side air heat exchanger air nozzle, 21802 is subsystem 2 wind side air heat exchanger liquid nozzle; 220 is subsystem 2 gas-liquid separator, 22001 is subsystem 2 gas-liquid separator inlet, 22002 is subsystem 2 gas-liquid separator outlet.

1. refrigeration cycle:

when refrigerating: the end D and the end E of the four-way valve 12 of the subsystem 1 are communicated, the end S and the end C are communicated, the end 11901 and the end 11903 of the third three-way valve 119 of the subsystem 1 are communicated, the third electronic expansion valve 116 of the subsystem 1 is closed, the first electromagnetic valve 111 of the subsystem 1 is opened, the second electromagnetic valve 112 of the subsystem 1 is controlled to be opened according to whether the exhaust temperature is controlled to be opened during the operation of the unit (for example, the exhaust temperature is opened when the exhaust temperature is higher than a first set value and is closed when the exhaust temperature is lower than a second set value, a specific control method is omitted here), the second electronic expansion valve 110 of the subsystem 1 is opened and regulated, the end 1902 and the end 1903 of the second three-way valve 19 of the subsystem 1 are communicated, the first electronic expansion valve 16 of the subsystem 1 is opened and regulated, and the end 1301 and the end 1303 of the first three-way valve 13 of the subsystem 1 are communicated; the end D and the end E of the four-way valve 22 of the subsystem 2 are communicated, the end S and the end C are communicated, the end 21901 and the end 21903 of the third three-way valve 219 of the subsystem 2 are communicated, the third electronic expansion valve 216 of the subsystem 1 is closed, the first electromagnetic valve 211 of the subsystem 2 is opened, the second electromagnetic valve 212 of the subsystem 2 is controlled to be opened according to whether the exhaust temperature is controlled to be opened during the operation of the unit (for example, the exhaust temperature is opened when the exhaust temperature is higher than a first set value and is closed when the exhaust temperature is lower than a second set value, a specific control method is omitted here), the second electronic expansion valve 210 of the subsystem 2 is opened and regulated, the end 2902 and the end 2903 of the third three-way valve 29 of the subsystem 2 are communicated, the second electronic expansion valve 26 of the subsystem 2 is opened and regulated, and the end 2301 and the end 2302 of the first three-way valve 23 of the subsystem 2 are communicated; the two subsystems are mutually independent for refrigeration during refrigeration.

Refrigeration cycle refrigerant cycle flow:

refrigeration main circuit:

subsystem 1:12002→1101→11→1102→12d→12e→11801→118→11802→11901→119→11903→117→1802→ 18- & gt 1801- & gt 16- & gt 15- & gt 0402- & gt 04- & gt 0401- & gt 1303- & gt 13- & gt 1301- & gt 12C- & gt 12S- & gt 12001- & gt 120- & gt 12002;

subsystem 2:22002→2101→21→2102→22d→22e→21801→218→21802→21901→219→ 21903 →217→2802→ 28- & gt 2801- & gt 26- & gt 25- & gt 0404- & gt 04- & gt 0403- & gt 2301- & gt 23- & gt 2302- & gt 22C- & gt 22S- & gt 22001- & gt 220- & gt 22002.

Refrigeration jet enthalpy-increasing loop:

subsystem 1: 1103- > 11- > 1102- > 12D- > 12E- > 11801- > 118- > 11802- > 11901- > 119- > 11903- > 117- > 111- > 110- > 1803- > 18- > 1804- > 1902- > 19- > 1903- > 114- > 115- > 1103- > and;

subsystem 2:2103→21→2102→22d→22e→21801→218→21802→21901→219→ 21903 → 217- & gt 211- & gt 210- & gt 2803- & gt 28- & gt 2804- & gt 2902- & gt 29- & gt 2903- & gt 214- & gt 215- & gt 2103.

Refrigeration hydrojet return circuit:

subsystem 1: 1103- > 11- > 1102- > 12D- > 12E- > 11801- > 118- > 11802- > 11901- > 119- > 11903- > 117- > 112- > 113- > 115- > 1103- > and;

subsystem 2:2103→21→2102→22d→22e→21801→218→21802→21901→219→ 21903 →217→212→213→215→2103.

2. Heating cycle:

when heating, the method comprises the following steps: the end D and the end C of the four-way valve 12 of the subsystem 1 are communicated, the end S and the end E are communicated, the end 11901 of the third three-way valve 119 of the subsystem 1 is communicated with the end 11903, the third electronic expansion valve 116 of the subsystem 1 is opened and regulated, the first electromagnetic valve 111 of the subsystem 1 is opened, the second electromagnetic valve 112 of the subsystem 1 is controlled to be opened according to whether the exhaust temperature is controlled to be opened in the running process of the unit (for example, the exhaust temperature is opened when the exhaust temperature is higher than a first set value and is closed when the exhaust temperature is lower than a second set value, a specific control method is omitted here), the second electronic expansion valve 110 of the subsystem 1 is opened and regulated, the end 1902 and the end 1903 of the second three-way valve 19 of the subsystem 1 are communicated, the first electronic expansion valve 16 of the subsystem 1 is closed, and the end 1301 and the end 1303 of the first three-way valve 13 of the subsystem 1 are communicated; the end D and the end C of the four-way valve 22 of the subsystem 2 are communicated, the end S and the end E are communicated, the end 21901 and the end 21903 of the third three-way valve 219 of the subsystem 2 are communicated, the third electronic expansion valve 216 of the subsystem 1 is opened and regulated, the first electromagnetic valve 211 of the subsystem 2 is opened, the second electromagnetic valve 212 of the subsystem 2 is opened according to whether the exhaust temperature control is opened during the operation of the unit (for example, the exhaust temperature is opened when the exhaust temperature is higher than a first set value and closed when the exhaust temperature is lower than a second set value, the specific control method is omitted here), the second electronic expansion valve 210 of the subsystem 2 is opened and regulated, the end 2902 and the end 2903 of the second three-way valve 29 of the subsystem 2 are communicated, the second electronic expansion valve 26 of the subsystem 2 is closed, and the end 2301 and the end 2302 of the first three-way valve 23 of the subsystem 2 are communicated; and during heating, the two subsystems heat independently.

Heating cycle refrigerant circulation flow:

heating main loop:

subsystem 1:12002→1101→11→1102→12d→12c→1301→13→1303→0401→04→0402→15→17→1801→ 18→1802→116→11903→119→11901→11802→118→11801→12e→12s→12001→120→12002;

subsystem 2:22002→2101→21→2102→22d→22c→2302→23→2301→0403→04→0404→25→27→2801→ 28- & gt 2802- & gt 216- & gt 21903- & gt 219- & gt 21901- & gt 21802- & gt 218- & gt 21801- & gt 22E- & gt 22S- & gt 22001- & gt 220- & gt 22002.

Heating jet enthalpy increasing loop:

subsystem 1: 1103- > 11- > 1102- > 12D- > 12C- > 1301- > 13- > 1303- > 0401- > 04- > 0402- > 15- > 17- > 1801- > 18- > 1802- > 111- > 110- > 1803- > 18- > 1804- > 1902- > 19- > 1903- > 114- > 115- > 1103- > and;

subsystem 2:2103, 21, 2102, 22D, 22C, 2302, 23, 2301, 0403, 04, 0404, 25, 27, 2801 28→2802→211→210→2803→28→2804→2902→29→2903→214→215→2103.

Heating hydrojet return circuit:

subsystem 1: 1103- > 11- > 1102- > 12D- > 12C- > 1301- > 13- > 1303- > 0401- > 04- > 0402- > 15- > 17- > 1801- > 18- > 1802- > 112- > 113- > 115- > 1103- > and;

subsystem 2:2103→21→2102→22d→22c→2302→23→2301→0403→04→ 0404→25→27→2801→28→2802→212→213→215→2103.

3. Defrosting cycle:

(1) Subsystem 1 defrost, subsystem 2 heat

The four-way valve of the subsystem 1 is reversed, the end D and the end E of the subsystem 12 are communicated, the end S and the end C of the subsystem 1 are communicated, the end 11901 of the third three-way valve 119 of the subsystem 1 is communicated with the end 11902, the third electronic expansion valve 116 of the subsystem 1 is closed, the first electromagnetic valve 111 of the subsystem 1 is closed, the second electromagnetic valve 112 of the subsystem 1 is closed, the second electronic expansion valve 110 of the subsystem 1 is closed, the first electronic expansion valve 16 of the subsystem 1 is closed, and the ends 1302 and 1301 of the first three-way valve 13 of the subsystem 1 are communicated; the end D and the end C of the four-way valve 22 of the subsystem 2 are communicated, the end S and the end E are communicated, the end 21901 and the end 21903 of the third three-way valve 219 of the subsystem 2 are communicated, the third electronic expansion valve 216 of the subsystem 2 is opened and regulated, the first electromagnetic valve 211 of the subsystem 2 is closed, the second electromagnetic valve 212 of the subsystem 2 is opened according to whether the exhaust temperature control is opened during the operation of the unit (for example, the exhaust temperature is opened when the exhaust temperature is higher than a first set value and is closed when the exhaust temperature is lower than a second set value, a specific control method is omitted here), the second electronic expansion valve 210 of the subsystem 2 is opened and regulated, the end 2902 and the end 2901 of the second three-way valve 29 of the subsystem 2 are communicated, the second electronic expansion valve 26 of the subsystem 2 is closed, and the end 2301 and the end 2302 of the first three-way valve 23 of the subsystem 2 are communicated;

Subsystem 1 defrost cycle refrigerant cycle flow: 12002→1101→11→1102→12d→12e→11801→118→11802→11901→119→11902→210→ 2803→28→2804→2902→29→2901→1302→13→1301→12c→12s→12001→120→12002; subsystem 2 heating refrigerant cycle flow: 22002→2101→21→2102→22d→22c→2302→23→2301→0403→04→0404→25→27→2801→ 28- & gt 2802- & gt 216- & gt 21903- & gt 219- & gt 21901- & gt 21802- & gt 218- & gt 21801- & gt 22E- & gt 22S- & gt 22001- & gt 220- & gt 22002; subsystem 2 heating hydrojet circuit: 2103→21→2102→22d→22c→2302→23→2301→0403→04→ 0404→25→27→2801→28→2802→212→213→215→2103.

(2) Subsystem 2 defrost, subsystem 1 heat

The end D and the end E of the four-way valve 22 of the subsystem 2 are communicated, the end S and the end C are communicated, the end 21901 of the third three-way valve 219 of the subsystem 2 is communicated with the end 21902, the third electronic expansion valve 216 of the subsystem 2 is closed, the first electromagnetic valve 211 of the subsystem 2 is closed, the second electromagnetic valve 212 of the subsystem 2 is closed, the second electronic expansion valve 210 of the subsystem 2 is closed, the first electronic expansion valve 26 of the subsystem 2 is closed, and the ends 2302 and 2303 of the first three-way valve 23 of the subsystem 2 are communicated; the end D and the end C of the four-way valve 22 of the subsystem 1 are communicated, the end S and the end E are communicated, the end 11901 of the third three-way valve 119 of the subsystem 1 is communicated with the end 11903, the third electronic expansion valve 116 of the subsystem 1 is opened and regulated, the first electromagnetic valve 111 of the subsystem 1 is closed, the second electromagnetic valve 112 of the subsystem 1 is controlled to be opened according to whether the exhaust temperature is controlled to be opened during the operation of the unit (for example, the exhaust temperature is opened when the exhaust temperature is higher than a first set value and is closed when the exhaust temperature is lower than a second set value, a specific control method is omitted here), the second electronic expansion valve 110 of the subsystem 1 is opened and regulated, the end 1902 and the end 1901 of the second three-way valve 19 of the subsystem 1 are communicated, the second electronic expansion valve 16 of the subsystem 1 is closed, and the end 1301 and the end 1303 of the first three-way valve 13 of the subsystem 1 are communicated;

Subsystem 2 defrost cycle refrigerant cycle flow: 22002→2101→21→2102→22d→22e→21801→218→21802→21901→219→21902→110→ 1803→18→1804→1902→19→1901→2303→23→2302→22c→22s→22001→220→22002; subsystem 1 heating refrigerant cycle flow: 12002→1101→11→1102→12d→12c→1301→13→1303→0401→04→0402→15→17→1801→ 18→1802→116→11903→119→11901→11802→118→11801→12e→12s→12001→120→12002; subsystem 1 heating hydrojet circuit: 1103- > 11- > 1102- > 12D- > 12C- > 1301- > 13- > 1303- > 0401- > 04- > 0402- > 15- > 17- > 1801- > 18- > 1802- > 112- > 113- > 115- > 1103- > and.

It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims

1. The low-temperature jet enthalpy-increasing air conditioning system is characterized in that: the air conditioning system comprises more than two air conditioning subsystems, wherein each air conditioning subsystem comprises an outdoor heat exchanger, an indoor heat exchanger, a compressor and an economizer for supplementing air and increasing enthalpy, the economizer is positioned between the outdoor heat exchanger and the indoor heat exchanger and comprises a low-pressure pipeline and a high-pressure pipeline which are opposite, and the outdoor heat exchanger of one air conditioning subsystem can be connected to the low-pressure pipeline of the economizer of the other air conditioning subsystem during defrosting and then connected back to the suction end of the compressor of the other air conditioning subsystem;

the air conditioning subsystem comprises a first air conditioning subsystem and a second air conditioning subsystem, and the first air conditioning subsystem and the second air conditioning subsystem share the indoor heat exchanger and can exchange heat with the indoor through the indoor heat exchanger;

the first air conditioning subsystem comprises a first compressor (11), a first four-way valve (12) connected to a first compressor exhaust port, a first economizer (18) and a first outdoor heat exchanger (118); the second air conditioning subsystem comprises a second compressor (21) and a second four-way valve (22) connected to a second compressor exhaust port, and a second economizer (28) and a second outdoor heat exchanger (218); the air suction port of the first compressor (11) and the air suction port of the second compressor (21) are both provided with a gas-liquid separator;

A third three-way valve A (119) is arranged at a first end of the first outdoor heat exchanger (118), and three ends of the third three-way valve A (119) are respectively connected to low-pressure inlet pipelines of the first economizer (18), the first end of the first outdoor heat exchanger and a second economizer (28) of the second air conditioning subsystem; a first end of the second outdoor heat exchanger (218) is provided with a third three-way valve B (219), and three ends of the third three-way valve B (219) are connected to the low pressure inlet lines of the second economizer (28), the first end of the second outdoor heat exchanger and the first economizer (18) of the first air conditioning subsystem, respectively; in each air conditioning subsystem, a high-pressure pipeline of the economizer is connected with the indoor heat exchanger, the high-pressure pipeline and the low-pressure pipeline are converged and then connected to the outdoor heat exchanger near the outdoor heat exchanger end, and the low-pressure pipeline is connected to the air supplementing end of the compressor after passing through the economizer.

2. The low temperature enhanced vapor injection air conditioning system according to claim 1, wherein: more than two air conditioning subsystems share one indoor heat exchanger, and heat exchange can be carried out indoors.

3. The low temperature enhanced vapor injection air conditioning system according to claim 2, wherein: the indoor heat exchanger is a hot water heat exchanger, water enters from one end and is discharged from the other end, and more than two heat exchange pipelines of the air conditioning subsystem are connected to the hot water heat exchanger and can exchange heat with the water.

4. The low temperature enhanced vapor injection air conditioning system according to claim 1, wherein: a second throttling device A (110) is arranged on the low-pressure inlet pipeline of the first economizer (18), and the third three-way valve B (219) is connected to the low-pressure inlet pipeline of the first economizer and is at a position far away from the first economizer (18) relative to the second throttling device A (110);

and/or a second throttling device B (210) is further arranged on the low-pressure inlet pipeline of the second economizer (28), and the third three-way valve A (119) is connected to the low-pressure inlet pipeline of the second economizer and is far away from the second economizer (28) relative to the second throttling device B (210).

5. The low temperature enhanced vapor injection air conditioning system according to claim 1, wherein: wherein three ends of a first three-way valve A (13) of a first air conditioning subsystem are respectively connected to one end (2901) of a first four-way valve (12), the indoor heat exchanger (04) and a second three-way valve B (29) of a second air conditioning subsystem, which is positioned on a low-pressure outlet pipeline of a second economizer (28);

And/or, three ends of the first three-way valve B (23) of the second air conditioning subsystem are respectively connected to the second four-way valve (22), the indoor heat exchanger (04) and one end (1901) of the second three-way valve A (19) of the first air conditioning subsystem, which is positioned on a low-pressure outlet pipeline of the first economizer (18).

6. The low temperature enhanced vapor injection air conditioning system according to claim 5, wherein: three ends of the second three-way valve A (19) are respectively connected to a low-pressure outlet end of the first economizer (18), a gas supplementing end (1103) of the first compressor and a first three-way valve B (23) of the second air conditioning subsystem;

and/or the three ends of the second three-way valve B (29) are respectively connected to the low-pressure outlet end of the second economizer (28), the air supplementing end (2103) of the second compressor and the first three-way valve a (13) of the first air conditioning subsystem.

7. The low temperature enhanced vapor injection air conditioning system according to any of claims 1-6, wherein: a first throttling device A is also arranged between the indoor heat exchanger (04) and the first economizer (18); and/or a first throttling device B is also arranged between the indoor heat exchanger (04) and the second economizer (28);

and/or a third throttling means a is also provided between the first outdoor heat exchanger (118) and the first economizer (18); and/or a third throttling device B is also arranged between the second outdoor heat exchanger (218) and the second economizer (28).