A flooded evaporative air source heat pump system

Abstract

The application relates to a full-liquid evaporation type air source heat pump system, belonging to the field of heat supply air conditioning. The two ends of an exhaust pipeline are communicated with the outlet of a compressor and the inlet of a condenser; one end of a condensing pipeline is communicated with the outlet of the condenser and a gas-liquid separator; one end of a suction pipeline is communicated with the inlet of the compressor and the gas-liquid separator; the gas-liquid separator is communicated with multiple branch pipelines through a second condensing pipeline; each branch pipeline is communicated with the inlet of a corresponding evaporator; the outlets of multiple evaporators are communicated with a second suction pipeline through corresponding collecting pipelines; a bypass pipeline is communicated with the exhaust pipeline and one end of multiple branch pipelines; the other end of the branch pipeline is communicated with the inlet of the evaporator; one end of a branch collecting pipeline is communicated with the outlet of the evaporator; the other end of the branch collecting pipeline is communicated with a total collecting pipeline; the total collecting pipeline is communicated with the second suction pipeline; and the second suction pipeline is communicated with the second inlet of the gas-liquid separator. The application solves the problems of small single-machine heating capacity and low dry evaporation heat exchange efficiency of the existing air source heat pump unit.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of heat supply and air conditioning, and particularly relates to a full-liquid evaporation type air source heat pump system. BACKGROUND

[0002] The utility model patent with the authorization announcement number CN210399568U and the authorization announcement date April 24, 2020 discloses a "large split type air source heat pump multi-contact system based on low temperature environment", which connects multiple parallel evaporators in series on the refrigerant circulation pipeline, controls the refrigerant flow and compressor suction superheat degree in the system simultaneously through multiple throttles, and the technical scheme has the following problems:

[0003] (1) when the load of the compressor changes, the multiple throttles of the system act simultaneously to reduce the refrigerant flow and adjust the refrigerant superheat degree, since the flow change in a single evaporator is simultaneously affected by the compressor discharge capacity and the flow of other evaporators, it is difficult to achieve a new balance and a long time is needed, which cannot meet the needs of large units for rapid load increase and decrease;

[0004] (2) the heat exchange between the refrigerant and the air is mainly concentrated in the phase change heat exchange part, the system ensures the compressor suction superheat degree through dry evaporation, the increase in the number of evaporators does not effectively increase the phase change heat exchange area of the refrigerant in the evaporator, but increases the cost; the scheme solves the problem that the pipeline is easy to freeze when water is used as the medium, but does not consider the frosting problem of the outdoor evaporator.

[0005] The utility model patent with the authorization announcement number CN215570756U and the authorization announcement date January 18, 2022 discloses a "-25 DEG C low temperature large temperature difference energy storage defrosting screw type air source heat pump unit", which increases part of defrosting copper pipes in the evaporator of the unit, when it is monitored that the evaporator needs to be defrosted, the defrosting pump introduces the high-temperature fluid in the heat storage device into the defrosting copper pipe to melt the frost layer on the fin surface, and the defrosting purpose is achieved, and the scheme has the following problems:

[0006] (1) although the heat storage defrosting can accelerate the defrosting speed and reduce the direct influence of defrosting on terminal heat supply, the annual defrosting time of a large air source heat pump system is 500-1000h, the scheme needs to store a large amount of heat energy for defrosting, the initial investment is high, and the occupied area is large;

[0007] (2) the defrosting copper pipe only participates in the system circulation during the defrosting stage, and is idle during other time periods, a large amount of defrosting copper pipes reduces the wind side flow area of the fin heat exchanger and the effective refrigerant heat exchange area, which is not conducive to the efficient heat exchange of the evaporator. SUMMARY

[0008] The application aims to solve the problems in the background art and provides a full-liquid evaporation type air source heat pump system.

[0009] The present application provides a kind of evaporator to be placed in outdoor, compressor and condenser etc. are placed in indoor, are connected by working medium pipeline (i.e.: connecting indoor and outdoor system refrigerant flow pipeline, including bypass pipeline, condensing pipeline two and suction pipeline two), the heat pump system of long-distance transport of refrigerant, gas-liquid separator, working medium pump (refrigerant pump) are equipped between evaporator and compressor, to realize the uniform distribution of working medium in evaporator and wet evaporation heat exchange, heat gas bypass (bypass pipeline) is simultaneously arranged, to bypass part of exhaust gas of compressor to one side of outdoor evaporator, evaporator is arranged in groups and defrosted in groups.The present application solves the problems of small single machine heating capacity and low dry evaporation heat exchange efficiency of existing air source heat pump unit.

[0010] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0011] Scheme one: a full-liquid evaporation type air source heat pump system, comprising a compressor, a condenser, a main throttling valve, a gas-liquid separator, a plurality of evaporators, a refrigerant pump, a plurality of one-way valves, a plurality of main path electromagnetic valves, a plurality of bypass inlet electromagnetic valves, a plurality of bypass outlet electromagnetic valves, an exhaust gas pipeline, a condensing pipeline one, a condensing pipeline two, a plurality of liquid distribution pipelines, a plurality of liquid collection pipelines, a suction pipeline one, a suction pipeline two, a bypass pipeline, a plurality of gas distribution pipelines, a plurality of sub-gas collection pipelines, a total gas collection pipeline, a terminal water supply pipeline, and a terminal water return pipeline.

[0012] The two ends of the exhaust gas pipeline are respectively communicated with the outlet of the compressor and the inlet of the condenser, the two ends of the condensing pipeline one are respectively communicated with the outlet of the condenser and the first inlet of the gas-liquid separator, the two ends of the suction pipeline one are respectively communicated with the inlet of the compressor and the first outlet of the gas-liquid separator, the main throttling valve is installed on the condensing pipeline one, the second outlet of the gas-liquid separator is communicated with the plurality of liquid distribution pipelines through the condensing pipeline two, each liquid distribution pipeline is communicated with the inlet of the corresponding evaporator, the refrigerant pump is installed on the condensing pipeline two, the outlets of the plurality of evaporators are communicated with the suction pipeline two through the respective corresponding liquid collection pipelines, a one-way valve is installed on each liquid distribution pipeline, a main path electromagnetic valve is installed on each liquid collection pipeline, one end of the bypass pipeline is communicated with the exhaust gas pipeline, the other end of the bypass pipeline is communicated with one end of the plurality of gas distribution pipelines, the other end of each gas distribution pipeline is communicated with the inlet of the corresponding evaporator, a bypass inlet electromagnetic valve is installed on each gas distribution pipeline, one end of each sub-gas collection pipeline is communicated with the outlet of the corresponding evaporator, the other end of each sub-gas collection pipeline is communicated with the total gas collection pipeline, the total gas collection pipeline is communicated with the suction pipeline two, the suction pipeline two is communicated with the second inlet of the gas-liquid separator, a bypass outlet electromagnetic valve is installed on each sub-gas collection pipeline, the terminal water return pipeline and the terminal water supply pipeline are both communicated with the condenser.

[0013] Further, the air source heat pump system further comprises one or more bypass throttles; when the number of bypass throttles is one, the bypass throttle is installed on the total gas collecting pipeline; when the number of bypass throttles is multiple, the multiple bypass throttles are respectively installed on the respective corresponding sub-gas collecting pipelines and are located between the evaporator outlet and the bypass outlet solenoid valve.

[0014] Further, the air source heat pump system further comprises an oil return assembly; the oil return assembly is composed of an oil return separator, an ejector, an ejector high-pressure pipeline, a low-pressure pipeline and an oil return pipeline; the oil return separator is installed on the exhaust pipeline, the two ends of the ejector high-pressure pipeline are respectively communicated with the oil return separator and the ejector, the two ends of the low-pressure pipeline are respectively communicated with the ejector and the third outlet of the gas-liquid separator, and the two ends of the oil return pipeline are respectively communicated with the ejector and the suction pipeline.

[0015] Scheme two: a flooded evaporative air source heat pump system, comprising a compressor, a condenser, a main throttle valve, a gas-liquid separator, multiple evaporators, a refrigerant pump, multiple one-way valves, multiple main road solenoid valves, multiple bypass inlet solenoid valves, multiple bypass outlet solenoid valves, a bypass throttle valve, an exhaust pipeline, a condensing pipeline one, a condensing pipeline two, a condensing pipeline three, multiple liquid distribution pipelines, multiple liquid collecting pipelines, a suction pipeline one, a suction pipeline two, a bypass pipeline, multiple gas distribution pipelines, multiple sub-gas collecting pipelines, a total gas collecting pipeline, a terminal water supply pipeline, a terminal water return pipeline, and an overheat heater;

[0016] The two ends of the exhaust pipeline are respectively communicated with the outlet of the compressor and the inlet of the condenser, the two ends of the condensing pipeline one are respectively communicated with the inlet of the compressor and the outlet of the condenser, the first outlet of the gas-liquid separator is communicated with the first inlet of the gas-liquid separator through the suction pipeline one and the condensing pipeline three, and the main throttle valve is installed on the condensing pipeline three; the overheat heater is additionally arranged before the compressor inlet, and the inlet and outlet of one side of the overheat heater are respectively communicated with the condensing pipeline one, and the inlet and outlet of the other side of the overheat heater are respectively communicated with the suction pipeline one; the second outlet of the gas-liquid separator is communicated with the multiple liquid distribution pipelines through the condensing pipeline two, the refrigerant pump is installed on the condensing pipeline two, the multiple liquid distribution pipelines are communicated with the respective corresponding evaporator inlets, the multiple evaporator outlets are communicated with the suction pipeline two through the respective corresponding liquid collecting pipelines, the suction pipeline two is communicated with the second inlet of the gas-liquid separator, a one-way valve is installed on each liquid distribution pipeline, a main road solenoid valve is installed on each liquid collecting pipeline, one end of the bypass pipeline is communicated with the exhaust pipeline, the other end of the bypass pipeline is communicated with one end of the multiple gas distribution pipelines, and the other end of each gas distribution pipeline is communicated with the corresponding evaporator inlet;

[0017] The bypass inlet electromagnetic valve is installed on each branch gas pipeline, one end of each branch gas pipeline is communicated with the corresponding evaporator outlet, the other end of each branch gas pipeline is communicated with the total gas pipeline, the bypass outlet electromagnetic valve is installed on each branch gas pipeline, the total gas pipeline is communicated with the suction pipeline, the bypass throttle valve is installed on the total gas pipeline, and the terminal water return pipeline and the terminal water supply pipeline are communicated with the condenser.

[0018] Further, the air source heat pump system further comprises an oil return assembly; the oil return assembly is composed of an oil return separator, an ejector, an injection high-pressure pipeline, a low-pressure pipeline and an oil return pipeline; the oil return separator is installed on the exhaust pipeline, the injection high-pressure pipeline is communicated with the oil return separator and the ejector at two ends respectively, the low-pressure pipeline is communicated with the ejector and the third outlet of the gas-liquid separator at two ends respectively, and the oil return pipeline is communicated with the ejector and the first condensing pipeline at two ends respectively. The communication point of the oil return pipeline and the first condensing pipeline is located between the compressor inlet and the superheater, and the communication point of the bypass pipeline and the exhaust pipeline is located between the condenser and the oil return separator.

[0019] Scheme three: a flooded evaporative air source heat pump system, comprising a compressor, a condenser, a main throttle valve, a gas-liquid separator, a plurality of evaporators, a refrigerant pump, a plurality of one-way valves, a plurality of main electromagnetic valves, a plurality of bypass inlet electromagnetic valves, a plurality of bypass outlet electromagnetic valves, a bypass throttle valve, an exhaust pipeline, a first condensing pipeline, a second condensing pipeline, a plurality of liquid distribution pipelines, a plurality of liquid collection pipelines, a first suction pipeline, a second suction pipeline, a bypass pipeline, a plurality of branch gas pipelines, a plurality of branch gas pipelines, a total gas pipeline, a terminal water supply pipeline, a terminal water return pipeline, and a gas supplement assembly; the gas supplement assembly comprises an economizer, a condensing branch and a gas supplement branch.

[0020] The exhaust pipeline is communicated with the compressor outlet and the condenser inlet respectively, the condensing pipeline is communicated with the compressor inlet and the condenser outlet respectively, the first outlet of the gas-liquid separator is communicated with one end of the condensing branch pipeline through the suction pipeline and the condensing pipeline, the other end of the condensing branch pipeline is communicated with the condensing pipeline, the gas supplement branch pipeline is communicated with the condensing pipeline and the first inlet of the gas-liquid separator respectively, the inlet and the outlet of one side of the economizer are communicated with the condensing branch pipeline respectively, the inlet and the outlet of the other side of the economizer are communicated with the gas supplement branch pipeline respectively, the main throttling valve is installed on the gas supplement branch pipeline and is located between the economizer and the gas-liquid separator, the second outlet of the gas-liquid separator is communicated with the multiple distribution pipelines through the condensing pipeline, the multiple distribution pipelines are communicated with the corresponding evaporator inlets respectively, the refrigerant pump is installed on the condensing pipeline, the multiple evaporator outlets are communicated with the suction pipeline through the corresponding liquid collecting pipelines, the suction pipeline is communicated with the second inlet of the gas-liquid separator, the one-way valve is installed on each distribution pipeline, the main pipeline electromagnetic valve is installed on each liquid collecting pipeline, one end of the bypass pipeline is communicated with the exhaust pipeline, the other end of the bypass pipeline is communicated with one end of the multiple gas distribution pipelines, the other end of each gas distribution pipeline is communicated with the corresponding evaporator inlet, the bypass inlet electromagnetic valve is installed on each gas distribution pipeline, one end of each gas collecting pipeline is communicated with the corresponding evaporator outlet, the other end of each gas collecting pipeline is communicated with the total gas collecting pipeline, the bypass outlet electromagnetic valve is installed on each gas collecting pipeline, the total gas collecting pipeline is communicated with the suction pipeline, the bypass throttling valve is installed on the total gas collecting pipeline, and the terminal water return pipeline and the terminal water supply pipeline are both communicated with the condenser.

[0021] Further, the gas supplement assembly further comprises a gas supplement throttling valve; the gas supplement throttling valve is installed on the condensing branch pipeline and is located before the economizer.

[0022] Further, the air source heat pump system further comprises an overheating device; the overheating device is arranged before the compressor inlet, and the inlet and the outlet of one side of the overheating device are communicated with the condensing pipeline, and the inlet and the outlet of the other side of the overheating device are communicated with the suction pipeline.

[0023] Further, the air source heat pump system further comprises an oil return assembly; the oil return assembly comprises an oil return separator, an ejector, an ejector high-pressure pipeline, a low-pressure pipeline and an oil return pipeline; the oil return separator is installed on the exhaust pipeline, the two ends of the ejector high-pressure pipeline are communicated with the oil return separator and the ejector respectively, the two ends of the low-pressure pipeline are communicated with the ejector and the third outlet of the gas-liquid separator respectively, the two ends of the oil return pipeline are communicated with the ejector and the condensing pipeline respectively, and the communication point of the oil return pipeline and the condensing pipeline is located between the compressor inlet and the overheating device; the communication point of the bypass pipeline and the exhaust pipeline is located between the condenser and the oil return separator.

[0024] Compared with the prior art, the air source heat pump system has the following beneficial effects:

[0025] 1. By placing the evaporator outdoors, placing the compressor and condenser indoors, using refrigerant circulation, the commonly used scroll heat pump unit is changed to a screw unit (the compressor uses a screw compressor), realizing the large-scale of the air source heat pump system unit, greatly improving the heating capacity of a single unit, significantly reducing the floor area of the unit under the same power, solving the problem of insufficient single machine heating capacity of the conventional air source heat pump.

[0026] 2. By increasing the gas-liquid separator and the refrigerant pump in the system, the uniform distribution of refrigerant in multiple parallel evaporators is realized, the refrigerant is wet evaporated in the evaporator, and the problem of low utilization rate of the heat exchanger existing in the existing dry type evaporator unit is solved. The heat exchange efficiency of the evaporator and the operating efficiency of the unit are improved.

[0027] 3. By increasing the gas-liquid separator, the volatility of the refrigerant flow and pressure in the system when the compressor load changes is slowed down, so that the system can use a single throttling valve to respond to the change of the compressor discharge volume in real time, solving the problem of complex regulation and slow response of large air source heat pump units.

[0028] 4. By increasing the defrosting bypass (including bypass pipeline, multiple gas distribution pipelines, multiple bypass inlet solenoid valves, multiple bypass outlet solenoid valves, multiple gas distribution pipelines, bypass throttling valve, and total gas distribution pipeline) and the evaporator grouping arrangement, the evaporator grouping defrosting is realized, the defrosting process does not stop, and the influence of defrosting on the terminal heating is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structure schematic diagram of the flooded evaporative air source heat pump system of the present application;

[0030] Figure 2 is a structure schematic diagram of the flooded evaporative air source heat pump system of the present application;

[0031] Figure 3 is a structure schematic diagram of the flooded evaporative air source heat pump system of the present application;

[0032] Figure 4 is a structure schematic diagram of the flooded evaporative air source heat pump system of the present application;

[0033] Figure 5 is a structure schematic diagram of the flooded evaporative air source heat pump system of the present application.

[0034] The component names and figure marks involved in the above drawings are as follows:

[0035] Indoor Unit 1, Outdoor Unit 0, Compressor 1, Condenser 2, Main Throttling Valve 3, Gas-Liquid Separator 4, Evaporator 5, Refrigerant Pump 6, Check Valve 7, Main Solenoid Valve 8, Bypass Inlet Solenoid Valve 9, Bypass Outlet Solenoid Valve 10, Bypass Throttling Valve 11, Exhaust Pipe 12, Condensate Pipe 1 13-1, Condensate Pipe 2 13-2, Condensate Pipe 3 13-3, Liquid Distribution Pipe 14, Liquid Collection Pipe 15, Suction Pipe Gas pipeline 16-1, intake pipeline 2 16-2, bypass pipeline 17, gas distribution pipeline 18, gas distribution and collection pipeline 19, main gas collection pipeline 20, terminal water supply pipeline 21, terminal water return pipeline 22, oil separator 23, ejector 24, ejector high pressure pipeline 25, low pressure pipeline 26, oil return pipeline 27, superheater 28, economizer 29, make-up gas throttle valve 30, condensate branch 31, make-up gas branch 32. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] Specific implementation method one: as follows Figure 1 As shown, this embodiment discloses a flooded evaporative air source heat pump system, including a compressor 1, a condenser 2, a main throttle valve 3, a gas-liquid separator 4, multiple evaporators 5, a refrigerant pump 6, multiple check valves 7, multiple main solenoid valves 8, multiple bypass inlet solenoid valves 9, multiple bypass outlet solenoid valves 10, an exhaust pipe 12, a condenser pipe 13-1, a condenser pipe 2 13-2, multiple liquid distribution pipes 14, multiple liquid collection pipes 15, a suction pipe 16-1, a suction pipe 2 16-2, a bypass pipe 17, multiple gas distribution pipes 18, multiple gas distribution and collection pipes 19, a main gas collection pipe 20, a terminal water supply pipe 21, and a terminal return water pipe 22.

[0038] The exhaust pipeline 12 is communicated with the outlet of the compressor 1 and the inlet of the condenser 2, the condensing pipeline 13-1 is communicated with the outlet of the condenser 2 and the first inlet of the gas-liquid separator 4, the suction pipeline 16-1 is communicated with the inlet of the compressor 1 and the first outlet of the gas-liquid separator 4, the main throttle valve 3 is installed on the condensing pipeline 13-1, the second outlet of the gas-liquid separator 4 is communicated with the multiple branch pipelines 14 through the condensing pipeline 13-2, each branch pipeline 14 is communicated with the inlet of the corresponding evaporator 5, the refrigerant pump 6 is installed on the condensing pipeline 13-2, the outlets of the multiple evaporators 5 are communicated with the suction pipeline 16-2 through the corresponding liquid collecting pipelines 15, the one-way valve 7 is installed on each branch pipeline 14, the main electromagnetic valve 8 is installed on each liquid collecting pipeline 15, one end of the bypass pipeline 17 is communicated with the exhaust pipeline 12, the other end of the bypass pipeline 17 is communicated with one end of the multiple gas distribution pipelines 18, the other end of each gas distribution pipeline 18 is communicated with the inlet of the corresponding evaporator 5, the bypass inlet electromagnetic valve 9 is installed on each gas distribution pipeline 18, one end of each branch gas collection pipeline 19 is communicated with the outlet of the corresponding evaporator 5, the other end of each branch gas collection pipeline 19 is communicated with the total gas collection pipeline 20, the total gas collection pipeline 20 is communicated with the suction pipeline 16-2, the suction pipeline 16-2 is communicated with the second inlet of the gas-liquid separator 4, the bypass outlet electromagnetic valve 10 is installed on each branch gas collection pipeline 19, the terminal water return pipeline 22 and the terminal water supply pipeline 21 are both communicated with the condenser 2.

[0039] The effect of the embodiment is that the refrigerant in the evaporator 5 can be forced to flow at a long distance by adding the gas-liquid separator 4 and the refrigerant pump 6, (1) the indoor and outdoor long-distance arrangement of the air source heat pump evaporator and the compressor set is realized, (2) the problem of uneven distribution of refrigerant caused by the single machine compressor matched with multiple evaporators 5 in the process of large-scale air source heat pump is solved, (3) the refrigerant in the evaporator 5 always maintains a wet evaporation heat exchange state with a dryness less than 1, and the heat exchange capacity of the evaporator 5 under the same area is improved.

[0040] Specific implementation method two: as shown in Figure 1 and Figure 5 , the embodiment is a further description of the specific implementation method one, the air source heat pump system further comprises one or more bypass throttles 11; when the number of bypass throttles 11 is one, the bypass throttle 11 is installed on the total gas collection pipeline 20; when the number of bypass throttles 11 is multiple, the multiple bypass throttles 11 are respectively installed on the corresponding branch gas collection pipelines 19 and are located between the outlets of the evaporators 5 and the bypass outlet electromagnetic valves 10.

[0041] The effect of this implementation is that by adding a hot gas bypass branch (bypass pipe 17, gas distribution pipe 18) and a defrost circulation branch (i.e. starting from the outlet of compressor 1, along bypass pipe 17, gas distribution pipe 18, gas distribution and collection pipe 19, main gas collection pipe 20, and then returning to compressor 1 through suction pipe 16-2, a cycle is formed) at the exhaust port (outlet) of compressor 1, and multiple sets of evaporators 5 are set up, each set of evaporators 5 is connected to the defrost circulation branch, so that the evaporators 5 can be defrosted in groups. When a single evaporator 5 is defrosted, compressor 1 and other evaporators 5 still maintain heating operation. When defrosting in this way, the heating fluctuation of the unit is not large and the impact on the terminal is small.

[0042] Specific implementation method three: such as Figure 2 As shown, this embodiment is a further explanation of specific embodiment one or two. The air source heat pump system also includes an oil return assembly. The oil return assembly consists of an oil return separator 23, an ejector 24, an ejector high-pressure line 25, a low-pressure line 26, and an oil return line 27. The oil return separator 23 is installed on the exhaust line 12. The two ends of the ejector high-pressure line 25 are respectively connected to the oil return separator 23 and the ejector 24. The two ends of the low-pressure line 26 are respectively connected to the ejector 24 and the third outlet of the gas-liquid separator 4. The two ends of the oil return line 27 are respectively connected to the ejector 24 and the intake line 16-1.

[0043] The effect of this embodiment is that the lubricating oil in the gas-liquid separator 4 can be ejected back into the compressor 1 through the oil return assembly (also known as the ejector oil return system) to seal, cool and lubricate the compressor 1.

[0044] Specific implementation method four: such as Figure 3 As shown, this embodiment discloses a flooded evaporative air source heat pump system, including a compressor 1, a condenser 2, a main throttle valve 3, a gas-liquid separator 4, multiple evaporators 5, a refrigerant pump 6, multiple check valves 7, multiple main solenoid valves 8, multiple bypass inlet solenoid valves 9, multiple bypass outlet solenoid valves 10, a bypass throttle valve 11, an exhaust pipe 12, a condenser pipe 13-1, a condenser pipe 2 13-2, a condenser pipe 3 13-3, multiple liquid distribution pipes 14, multiple liquid collection pipes 15, a suction pipe 16-1, a suction pipe 2 16-2, a bypass pipe 17, multiple gas distribution pipes 18, multiple gas distribution and collection pipes 19, a main gas collection pipe 20, a terminal water supply pipe 21, a terminal return water pipe 22, and a superheater 28.

[0045] The exhaust pipeline 12 is communicated with the outlet of the compressor 1 and the inlet of the condenser 2 respectively, the condensing pipeline 13-1 is communicated with the inlet of the compressor 1 and the outlet of the condenser 2 respectively, the first outlet of the gas-liquid separator 4 is communicated with the first inlet of the gas-liquid separator 4 through the suction pipeline 16-1 and the condensing pipeline 13-3, and the main throttle valve 3 is installed on the condensing pipeline 13-3; the superheater 28 is additionally arranged before the suction of the compressor 1, the inlet and the outlet of one side of the superheater 28 are communicated with the condensing pipeline 13-1 respectively, and the inlet and the outlet of the other side of the superheater 28 are communicated with the suction pipeline 16-1 respectively; the second outlet of the gas-liquid separator 4 is communicated with the multiple distribution pipelines 14 through the condensing pipeline 13-2, the refrigerant pump 6 is installed on the condensing pipeline 13-2, the multiple distribution pipelines 14 are communicated with the inlets of the respective evaporators 5, the outlets of the multiple evaporators 5 are communicated with the suction pipeline 16-2 through the respective collecting pipelines 15, the suction pipeline 16-2 is communicated with the second inlet of the gas-liquid separator 4, the one-way valve 7 is installed on each distribution pipeline 14, the main electromagnetic valve 8 is installed on each collecting pipeline 15, one end of the bypass pipeline 17 is communicated with the exhaust pipeline 12, the other end of the bypass pipeline 17 is communicated with one end of the multiple gas distribution pipelines 18, and the other end of each gas distribution pipeline 18 is communicated with the inlet of the corresponding evaporator 5;

[0046] The bypass inlet electromagnetic valve 9 is installed on each gas distribution pipeline 18, one end of each gas-collecting pipeline 19 is communicated with the outlet of the corresponding evaporator 5, the other end of each gas-collecting pipeline 19 is communicated with the total gas-collecting pipeline 20, the bypass outlet electromagnetic valve 10 is installed on each gas-collecting pipeline 19, the total gas-collecting pipeline 20 is communicated with the suction pipeline 16-2, the bypass throttle valve 11 is installed on the total gas-collecting pipeline 20, and the terminal water return pipeline 22 and the terminal water supply pipeline 21 are both communicated with the condenser 2.

[0047] The effect of the embodiment is that, by increasing the superheater 28, the high-temperature refrigerant condensed by the evaporator 5 is used to improve the superheat degree of the suction of the compressor 1, and the wet compression of the compressor 1 is avoided, and the wet compression can cause the liquid hammer phenomenon in the compressor 1 and damage the compressor cavity.

[0048] Specific implementation five: as Figure 3As shown, this embodiment is a further explanation of specific embodiment four. The air source heat pump system also includes an oil return assembly; the oil return assembly consists of an oil return separator 23, an ejector 24, an ejector high-pressure line 25, a low-pressure line 26, and an oil return line 27; the oil return separator 23 is installed on the exhaust line 12, the two ends of the ejector high-pressure line 25 are connected to the oil return separator 23 and the ejector 24 respectively, the two ends of the low-pressure line 26 are connected to the ejector 24 and the third outlet of the gas-liquid separator 4 respectively, and the two ends of the oil return line 27 are connected to the ejector 24 and the condenser line 13-1 respectively. Furthermore, the connection point between the oil return line 27 and the condenser line 13-1 is located between the compressor 1 inlet and the superheater 28, and the connection point between the bypass line 17 and the exhaust line 12 is located between the condenser 2 and the oil return separator 23.

[0049] The effect of this embodiment is that the lubricating oil in the gas-liquid separator 4 can be ejected back into the compressor 1 through the oil return assembly (also known as the ejector oil return system) to seal, cool and lubricate the compressor 1.

[0050] Specific implementation method six: such as Figure 4 As shown, this embodiment discloses a flooded evaporative air source heat pump system, including a compressor 1, a condenser 2, a main throttle valve 3, a gas-liquid separator 4, multiple evaporators 5, a refrigerant pump 6, multiple check valves 7, multiple main solenoid valves 8, multiple bypass inlet solenoid valves 9, multiple bypass outlet solenoid valves 10, a bypass throttle valve 11, an exhaust pipe 12, a condenser pipe 13-1, a condenser pipe 2 13-2, multiple liquid distribution pipes 14, multiple liquid collection pipes 15, a suction pipe 16-1, a suction pipe 2 16-2, a bypass pipe 17, multiple gas distribution pipes 18, multiple gas distribution and collection pipes 19, a main gas collection pipe 20, a terminal water supply pipe 21, a terminal return water pipe 22, and a gas replenishment assembly; the gas replenishment assembly includes an economizer 29, a condenser branch 31, and a gas replenishment branch 32;

[0051] The exhaust pipe 12 is connected to the outlet of compressor 1 and the inlet of condenser 2 at both ends, respectively. The condenser pipe 13-1 is connected to the inlet of compressor 1 and the outlet of condenser 2 at both ends, respectively. The first outlet of gas-liquid separator 4 is connected to one end of condenser branch 31 via suction pipe 16-1 and condenser pipe 33-3. The other end of condenser branch 31 is connected to condenser pipe 33-3. The make-up gas branch 32 is connected to the first inlet of gas-liquid separator 4 via condenser pipe 13-1 at both ends, respectively. One inlet and outlet of economizer 29 are connected to condenser branch 31, respectively. The other inlet and outlet of economizer 29 are connected to make-up gas branch 32, respectively. The main throttle valve 3 is installed on make-up gas branch 32 and is located between economizer 29 and gas-liquid separator 4. The second outlet of gas-liquid separator 4 is connected to multiple liquid distribution pipes 14 via condenser pipe 23-2. The multiple liquid distribution pipes 14 are connected to their respective evaporator 5 inlets. The refrigerant pump 6 is installed on condenser pipe 23-2. Multiple evaporator 5 outlets are connected to suction line 2 16-2 via their respective liquid collection lines 15. Suction line 2 16-2 is connected to the second inlet of gas-liquid separator 4. Each liquid distribution line 14 is equipped with a one-way valve 7, and each liquid collection line 15 is equipped with a main solenoid valve 8. One end of bypass line 17 is connected to exhaust line 12, and the other end of bypass line 17 is connected to one end of multiple gas distribution lines 18. The other end of each gas distribution line 18 is connected to the inlet of the corresponding evaporator 5. Each gas distribution line 18 is equipped with a bypass inlet solenoid valve 9. One end of each gas distribution line 19 is connected to the outlet of the corresponding evaporator 5, and the other end of each gas distribution line 19 is connected to the main gas distribution line 20. Each gas distribution line 19 is equipped with a bypass outlet solenoid valve 10. The main gas distribution line 20 is connected to the suction line 16-2. A bypass throttle valve 11 is installed on the main gas distribution line 20. The terminal return water line 22 and the terminal supply water line 21 are both connected to the condenser 2.

[0052] The effect of this embodiment is that, under the condition that the temperature of the evaporator 5 is relatively low, the gas replenishment circulation through the economizer 29 can improve the efficiency of the compressor 1 refrigeration cycle, increase the cooling capacity, and reduce the discharge temperature of the compressor 1.

[0053] Specific implementation method seven: such as Figure 4 As shown, this embodiment is a further explanation of specific embodiment six. The air supply component also includes an air supply throttle valve 30; the air supply throttle valve 30 is installed on the condenser branch 31, located before the economizer 29.

[0054] Specific implementation method eight: such as Figure 4As shown, this embodiment is a further explanation of specific embodiment six or seven. The air source heat pump system also includes a superheater 28. A superheater 28 is added before the compressor 1 intake. The inlet and outlet of one side of the superheater 28 are connected to the condenser pipe 13-1, and the inlet and outlet of the other side of the superheater 28 are connected to the suction pipe 16-1.

[0055] The effect of this embodiment is that by adding a superheater 28, the superheat of the compressor 1 intake is increased by using the high-temperature refrigerant condensed by the evaporator 5, thus avoiding wet compression of the compressor 1. Wet compression can cause liquid slugging inside the compressor 1 and damage the compressor cavity.

[0056] Specific implementation method nine: as follows Figure 4 As shown, this embodiment is a further explanation of specific embodiment eight. The air source heat pump system also includes an oil return assembly. The oil return assembly consists of an oil return separator 23, an ejector 24, an ejector high-pressure line 25, a low-pressure line 26, and an oil return line 27. The oil return separator 23 is installed on the exhaust line 12. The two ends of the ejector high-pressure line 25 are connected to the oil return separator 23 and the ejector 24, respectively. The two ends of the low-pressure line 26 are connected to the ejector 24 and the third outlet of the gas-liquid separator 4, respectively. The two ends of the oil return line 27 are connected to the ejector 24 and the condenser line 13-1, respectively. The connection point between the oil return line 27 and the condenser line 13-1 is located between the compressor inlet 1 and the superheater 28. The connection point between the bypass line 17 and the exhaust line 12 is located between the condenser 2 and the oil return separator 23.

[0057] The effect of this embodiment is that the lubricating oil in the gas-liquid separator 4 can be ejected back into the compressor 1 through the oil return assembly (also known as the ejector oil return system) to seal, cool and lubricate the compressor 1.

[0058] The gas-liquid separator 4 has two inlets and three outlets. The two inlets are the first inlet and the second inlet, and the three outlets are the first outlet, the second outlet, and the third outlet.

[0059] The operating principle of this invention is as follows:

[0060] Heating process: such as Figure 1 , Figure 2 , Figure 5As shown, open the main road electromagnetic valve 8 and one-way valve 7 corresponding to each evaporator 5, all bypass inlet electromagnetic valve 9 and outlet electromagnetic valve 10 are closed; compressor 1 exhaust through the exhaust line 12 into the condenser 2 and through the end of the backwater line 22 into the end of the backwater heat exchange condensing, condensed refrigerant through the main throttle valve 3 after throttling through the condensing line one 13 into the gas-liquid separator 4, the liquid refrigerant in the gas-liquid separator 4 is pushed by the refrigerant pump 6 through the liquid distribution line 14 into the evaporator 5, the evaporated refrigerant flows into the gas-liquid separator 4 through the liquid collection line 15 and the suction line two 16-2, the liquid accumulates in the gas-liquid separator 4, the gas enters the compressor 1 through the suction line one 16-1, completes the heating cycle, the refrigerant pump 6 forced circulation makes the refrigerant in multiple evaporators 5 evenly distributed, effectively delays frosting.

[0061] Defrosting process: as shown in Figure 2 The main road electromagnetic valve 8 corresponding to the frosting evaporator 5 is closed, the bypass inlet electromagnetic valve 9 and the bypass outlet electromagnetic valve 10 are opened, the high temperature exhaust of the compressor 1 passes through the exhaust line 12, the bypass line 17 and the corresponding gas distribution line 18 into the evaporator 5 in turn, and after defrosting and cooling, it enters the bypass throttle valve 11 through the corresponding gas distribution line 19 and the total gas collection line 20 to reduce pressure, and then enters the gas-liquid separator 4 through the suction line two 16-2; after defrosting, the bypass inlet electromagnetic valve 9 and the bypass outlet electromagnetic valve 10 corresponding to the defrosting evaporator 5 are closed, and the corresponding main road electromagnetic valve 8 is opened; the remaining evaporators 5 operate according to the heating process without stopping defrosting during defrosting.

[0062] Oil return process: as shown in Figure 2 The oil separator 23 filters the lubricating oil from the exhaust of the compressor 1, and the high-pressure oil-containing refrigerant formed by the oil separator 23 is introduced into the ejector 24 through the injection high-pressure line 25, and the low-pressure oil-containing refrigerant introduced from the gas-liquid separator 4 through the low-pressure line 26 is injected, and the oil-containing refrigerant is mixed and introduced into the suction line one 16-1 through the oil return line 27, to ensure sufficient lubricating oil in the compressor 1.

[0063] Superheating process: as shown in Figure 3 The high-temperature refrigerant entering from the condensing line one 13 is heated by the superheater 28 to heat the low-temperature refrigerant entering the superheater 28 from the suction line one 16-1, so that it becomes superheated steam, and the superheated steam enters the compressor 1 to avoid wet compression of the compressor 1.

[0064] Supplementary air process: as shown in Figure 4 Part of the refrigerant flowing back from the condensing line one 13 passes through the condensing branch 31 and throttles through the supplementary air throttle valve 30 to enter the economizer 29, exchanges heat with the unthrottled refrigerant, absorbs heat and evaporates to superheat, and then enters the compressor 1 inlet through the supplementary air branch 32 to improve the efficiency of the compressor 1 and improve the compression working condition of the compressor 1.

[0065] Figure 4 InFigure 1 Based on the existing system, an oil separator 23, a superheater 28, and an economizer 29 were added, which is equivalent to a system overview diagram.

[0066] Figure 5 and Figure 1 In comparison, the single bypass throttle valve 11 installed on the main gas manifold 20 is replaced with multiple bypass throttle valves 11 installed on multiple individual gas manifolds 19.

[0067] Defrosting process: such as Figure 5 As shown, the main solenoid valve 8 corresponding to the frosting evaporator 5 is closed, while the bypass inlet solenoid valve 9 and the bypass outlet solenoid valve 10 are open. The high-temperature exhaust gas from the compressor 1 enters the evaporator 5 sequentially through the exhaust pipe 12, the bypass pipe 17, and the corresponding distribution pipe 18. After defrosting and cooling, it passes through the corresponding distribution pipe 19, and after being throttled and depressurized by the bypass throttling valve 11 set on the distribution pipe 19, it enters the gas-liquid separator 4 through the main distribution pipe 20 and the suction pipe 16. After defrosting, the bypass inlet solenoid valve 9 and the bypass outlet solenoid valve 10 corresponding to the defrosting evaporator 5 are closed, while the corresponding main solenoid valve 8 is open. During the defrosting process, the remaining evaporators 5 operate according to the heating process without shutting down the system.

[0068] In this invention, compressor 1 is a screw compressor.

[0069] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0070] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flooded evaporative air source heat pump system, characterized by: The air source heat pump system comprises a compressor (1), a condenser (2), a main throttle valve (3), a gas-liquid separator (4), a plurality of evaporators (5), a refrigerant pump (6), a plurality of one-way valves (7), a plurality of main path electromagnetic valves (8), a plurality of bypass inlet electromagnetic valves (9), a plurality of bypass outlet electromagnetic valves (10), an exhaust pipeline (12), a condensing pipeline I (13-1), a condensing pipeline II (13-2), a plurality of distribution pipelines (14), a plurality of collecting pipelines (15), a suction pipeline I (16-1), a suction pipeline II (16-2), a bypass pipeline (17), a plurality of distribution gas pipelines (18), a plurality of sub-distribution gas pipelines (19), a total collection gas pipeline (20), an end water supply pipeline (21), and an end water return pipeline (22). The exhaust pipeline (12) is in communication with the outlet of the compressor (1) and the inlet of the condenser (2), the condensing pipeline I (13-1) is in communication with the outlet of the condenser (2) and the first inlet of the gas-liquid separator (4), the suction pipeline I (16-1) is in communication with the inlet of the compressor (1) and the first outlet of the gas-liquid separator (4), the main throttle valve (3) is installed on the condensing pipeline I (13-1), the second outlet of the gas-liquid separator (4) is in communication with the plurality of distribution pipelines (14) through the condensing pipeline II (13-2), each distribution pipeline (14) is in communication with the inlet of the corresponding evaporator (5), the refrigerant pump (6) is installed on the condensing pipeline II (13-2), the outlets of the plurality of evaporators (5) are in communication with the suction pipeline II (16-2) through the corresponding collecting pipelines (15), each distribution pipeline (14) is provided with the one-way valve (7), each collecting pipeline (15) is provided with the main path electromagnetic valve (8), one end of the bypass pipeline (17) is in communication with the exhaust pipeline (12), the other end of the bypass pipeline (17) is in communication with one end of the plurality of distribution gas pipelines (18), the other end of each distribution gas pipeline (18) is in communication with the inlet of the corresponding evaporator (5), each distribution gas pipeline (18) is provided with the bypass inlet electromagnetic valve (9), one end of each sub-distribution gas pipeline (19) is in communication with the outlet of the corresponding evaporator (5), the other end of each sub-distribution gas pipeline (19) is in communication with the total collection gas pipeline (20), the total collection gas pipeline (20) is in communication with the suction pipeline II (16-2), the suction pipeline II (16-2) is in communication with the second inlet of the gas-liquid separator (4), each sub-distribution gas pipeline (19) is provided with the bypass outlet electromagnetic valve (10), the end water return pipeline (22) and the end water supply pipeline (21) are in communication with the condenser (2); The refrigerant in the evaporator (5) always maintains a wet evaporation heat exchange state with a dryness less than 1; The air source heat pump system further comprises one or more bypass throttles (11); when the number of bypass throttles (11) is one, the bypass throttle (11) is installed on the total collection gas pipeline (20); when the number of bypass throttles (11) is multiple, the plurality of bypass throttles (11) are respectively installed on the corresponding sub-distribution gas pipelines (19) and are located between the outlets of the evaporators (5) and the bypass outlet electromagnetic valves (10). The air source heat pump system further comprises an oil return assembly; the oil return assembly is composed of an oil return separator (23), an ejector (24), an ejector high-pressure pipeline (25), a low-pressure pipeline (26) and an oil return pipeline (27); the oil return separator (23) is installed on the exhaust pipeline (12), the two ends of the ejector high-pressure pipeline (25) are respectively communicated with the oil return separator (23) and the ejector (24), the two ends of the low-pressure pipeline (26) are respectively communicated with the ejector (24) and the third outlet of the gas-liquid separator (4), and the two ends of the oil return pipeline (27) are respectively communicated with the ejector (24) and the suction pipeline (16-1).

2. A flooded evaporative air source heat pump system, characterized by: The air source heat pump system comprises a compressor (1), a condenser (2), a main throttle valve (3), a gas-liquid separator (4), a plurality of evaporators (5), a refrigerant pump (6), a plurality of one-way valves (7), a plurality of main path electromagnetic valves (8), a plurality of bypass inlet electromagnetic valves (9), a plurality of bypass outlet electromagnetic valves (10), a bypass throttle valve (11), an exhaust pipeline (12), a condensing pipeline one (13-1), a condensing pipeline two (13-2), a condensing pipeline three (13-3), a plurality of distribution pipelines (14), a plurality of liquid collection pipelines (15), a suction pipeline one (16-1), a suction pipeline two (16-2), a bypass pipeline (17), a plurality of gas distribution pipelines (18), a plurality of sub-gas collection pipelines (19), a total gas collection pipeline (20), a terminal water supply pipeline (21), a terminal water return pipeline (22) and an overheat heater (28); The two ends of the exhaust pipeline (12) are respectively communicated with the outlet of the compressor (1) and the inlet of the condenser (2), the two ends of the condensing pipeline one (13-1) are respectively communicated with the inlet of the compressor (1) and the outlet of the condenser (2), the first outlet of the gas-liquid separator (4) is communicated with the first inlet of the gas-liquid separator (4) through the suction pipeline one (16-1) and the condensing pipeline three (13-3), and the main throttle valve (3) is installed on the condensing pipeline three (13-3); the overheat heater (28) is additionally arranged before the suction of the compressor (1), one side inlet and outlet of the overheat heater (28) are respectively communicated with the condensing pipeline one (13-1), and the other side inlet and outlet of the overheat heater (28) are respectively communicated with the suction pipeline one (16-1); the second outlet of the gas-liquid separator (4) is communicated with the plurality of distribution pipelines (14) through the condensing pipeline two (13-2), the refrigerant pump (6) is installed on the condensing pipeline two (13-2), the plurality of distribution pipelines (14) are communicated with the inlets of the respective corresponding evaporators (5), the outlets of the plurality of evaporators (5) are communicated with the suction pipeline two (16-2) through the respective corresponding liquid collection pipelines (15), the suction pipeline two (16-2) is communicated with the second inlet of the gas-liquid separator (4), the one-way valve (7) is installed on each distribution pipeline (14), the main path electromagnetic valve (8) is installed on each liquid collection pipeline (15), one end of the bypass pipeline (17) is communicated with the exhaust pipeline (12), the other end of the bypass pipeline (17) is communicated with one end of the plurality of gas distribution pipelines (18), and the other end of each gas distribution pipeline (18) is communicated with the inlet of the corresponding evaporator (5); Each branch gas pipeline (18) is provided with a bypass inlet electromagnetic valve (9), one end of each branch gas pipeline (19) is communicated with the outlet of the corresponding evaporator (5), the other end of each branch gas pipeline (19) is communicated with a total gas pipeline (20), each branch gas pipeline (19) is provided with a bypass outlet electromagnetic valve (10), the total gas pipeline (20) is communicated with the suction gas pipeline two (16-2), a bypass throttle valve (11) is arranged on the total gas pipeline (20), and the terminal water return pipeline (22) and the terminal water supply pipeline (21) are both communicated with the condenser (2).

3. A flooded evaporative air source heat pump system as claimed in claim 2, wherein: The air source heat pump system further comprises an oil return assembly; the oil return assembly comprises an oil return separator (23), an ejector (24), an ejector high-pressure pipeline (25), a low-pressure pipeline (26) and an oil return pipeline (27); the oil return separator (23) is arranged on the exhaust pipeline (12), the two ends of the ejector high-pressure pipeline (25) are communicated with the oil return separator (23) and the ejector (24) respectively, the two ends of the low-pressure pipeline (26) are communicated with the ejector (24) and the third outlet of the gas-liquid separator (4) respectively, the two ends of the oil return pipeline (27) are communicated with the ejector (24) and the condensing pipeline one (13-1) respectively, the communication point of the oil return pipeline (27) and the condensing pipeline one (13-1) is located between the inlet of the compressor (1) and the superheater (28), and the communication point of the bypass pipeline (17) and the exhaust pipeline (12) is located between the condenser (2) and the oil return separator (23).

4. A flooded evaporative air source heat pump system characterized by: The air source heat pump system further comprises an oil return assembly; the oil return assembly comprises an oil return separator (23), an ejector (24), an ejector high-pressure pipeline (25), a low-pressure pipeline (26) and an oil return pipeline (27); the oil return separator (23) is arranged on the exhaust pipeline (12), the two ends of the ejector high-pressure pipeline (25) are communicated with the oil return separator (23) and the ejector (24) respectively, the two ends of the low-pressure pipeline (26) are communicated with the ejector (24) and the third outlet of the gas-liquid separator (4) respectively, the two ends of the oil return pipeline (27) are communicated with the ejector (24) and the condensing pipeline one (13-1) respectively, the communication point of the oil return pipeline (27) and the condensing pipeline one (13-1) is located between the inlet of the compressor (1) and the superheater (28), and the communication point of the bypass pipeline (17) and the exhaust pipeline (12) is located between the condenser (2) and the oil return separator (23). The air source heat pump system further comprises an oil return assembly; the oil return assembly comprises an oil return separator (23), an ejector (24), an ejector high-pressure pipeline (25), a low-pressure pipeline (26) and an oil return pipeline (27); the oil return separator (23) is arranged on the exhaust pipeline (12), the two ends of the ejector high-pressure pipeline (25) are communicated with the oil return separator (23) and the ejector (24) respectively, the two ends of the low-pressure pipeline (26) are communicated with the ejector (24) and the third outlet of the gas-liquid separator (4) respectively, the two ends of the oil return pipeline (27) are communicated with the ejector (24) and the condensing pipeline one (13-1) respectively, the communication point of the oil return pipeline (27) and the condensing pipeline one (13-1) is located between the inlet of the compressor (1) and the superheater (28), and the communication point of the bypass pipeline (17) and the exhaust pipeline (12) is located between the condenser (2) and the oil return separator (23). The exhaust pipeline (12) is communicated with the outlet of the compressor (1) and the inlet of the condenser (2) respectively, the condensing pipeline (13-1) is communicated with the inlet of the compressor (1) and the outlet of the condenser (2) respectively, the first outlet of the gas-liquid separator (4) is communicated with one end of the condensing branch (31) through the suction pipeline (16-1) and the condensing pipeline (13-3), the other end of the condensing branch (31) is communicated with the condensing pipeline (13-3), the gas supplement branch (32) is communicated with the condensing pipeline (13-1) and the first inlet of the gas-liquid separator (4) respectively, the inlet and the outlet of one side of the economizer (29) are communicated with the condensing branch (31) respectively, the inlet and the outlet of the other side of the economizer (29) are communicated with the gas supplement branch (32) respectively, the main throttling valve (3) is installed on the gas supplement branch (32) and located between the economizer (29) and the gas-liquid separator (4), the second outlet of the gas-liquid separator (4) is communicated with the plurality of distribution pipelines (14) through the condensing pipeline (13-2), the plurality of distribution pipelines (14) are communicated with the inlets of the respective corresponding evaporators (5), the refrigerant pump (6) is installed on the condensing pipeline (13-2), the outlets of the plurality of evaporators (5) are communicated with the suction pipeline (16-2) through the respective corresponding liquid collecting pipelines (15), the suction pipeline (16-2) is communicated with the second inlet of the gas-liquid separator (4), the one-way valve (7) is installed on each distribution pipeline (14), the main road electromagnetic valve (8) is installed on each liquid collecting pipeline (15), one end of the bypass pipeline (17) is communicated with the exhaust pipeline (12), the other end of the bypass pipeline (17) is communicated with one end of the plurality of gas distribution pipelines (18), the other end of each gas distribution pipeline (18) is communicated with the inlet of the corresponding evaporator (5), the bypass inlet electromagnetic valve (9) is installed on each gas distribution pipeline (18), one end of each gas collecting pipeline (19) is communicated with the outlet of the corresponding evaporator (5), the other end of each gas collecting pipeline (19) is communicated with the total gas collecting pipeline (20), the bypass outlet electromagnetic valve (10) is installed on each gas collecting pipeline (19), the total gas collecting pipeline (20) is communicated with the suction pipeline (16-2), the bypass throttling valve (11) is installed on the total gas collecting pipeline (20), the terminal water return pipeline (22) and the terminal water supply pipeline (21) are both communicated with the condenser (2).

5. A flooded evaporative air source heat pump system as claimed in claim 4, wherein: The gas supplement assembly further comprises a gas supplement throttling valve (30); the gas supplement throttling valve (30) is installed on the condensing branch (31) and located before the economizer (29).

6. A flooded evaporative air source heat pump system as claimed in claim 4 or 5, wherein: The air source heat pump system further comprises a superheater (28); the superheater (28) is additionally arranged before the suction of the compressor (1), the inlet and the outlet of one side of the superheater (28) are communicated with the condensing pipeline (13-1) respectively, and the inlet and the outlet of the other side of the superheater (28) are communicated with the suction pipeline (16-1) respectively.

7. A flooded evaporative air source heat pump system as claimed in claim 6, wherein: The air source heat pump system further comprises an oil return assembly; the oil return assembly is composed of an oil return separator (23), an ejector (24), an ejector high-pressure pipeline (25), a low-pressure pipeline (26) and an oil return pipeline (27); the oil return separator (23) is installed on the exhaust pipeline (12), the two ends of the ejector high-pressure pipeline (25) are respectively communicated with the oil return separator (23) and the ejector (24), the two ends of the low-pressure pipeline (26) are respectively communicated with the ejector (24) and the third outlet of the gas-liquid separator (4), the two ends of the oil return pipeline (27) are respectively communicated with the ejector (24) and the condensing pipeline (13-1), and the communication point of the oil return pipeline (27) and the condensing pipeline (13-1) is located between the inlet of the compressor (1) and the superheater (28); the communication point of the bypass pipeline (17) and the exhaust pipeline (12) is located between the condenser (2) and the oil return separator (23).

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