Air conditioner heat pump system

Abstract

The utility model discloses an air conditioner heat pump system which comprises a compressor, a use side heat exchanger, a first throttling valve, an economizer, a second throttling valve and a source side heat exchanger. The first throttle valve is arranged at a gas-liquid inlet of the economizer; the second throttle valve is arranged at a liquid outlet of the economizer; a first one-way valve and a second one-way valve are respectively arranged in connecting loops of the use side heat exchanger and the source side heat exchanger with the first throttle valve; a third one-way valve and a fourth one-way valve are arranged in a connecting loop of the second throttling valve and the use side heat exchanger and a connecting loop of the second throttling valve and the source side heat exchanger respectively. The one-way valve is additionally arranged in the heat pump system, the refrigerating and heating working conditions can be achieved only through switching of the valves in the system, and waterway switching is not needed; the unit system is simple, oil-free operation is achieved, and the system is efficient and energy-saving.

Description

Technical Field

[0001] The invention relates to the field of air conditioning, and in particular to an air conditioning heat pump system. Background Art

[0002] In the existing technology, the research and application of magnetic suspension variable frequency centrifuges are becoming more and more extensive. Its main features are oil-free operation and high efficiency and energy saving. It is mainly used in industrial and commercial comfort air conditioning and process air conditioning places.

[0003] At present, the existing fluorine-circuit switching water source air conditioning heat pump system solution mainly adopts a screw compression cycle system or unit, which mainly includes a refrigeration compressor, a water source side heat exchanger, a user side heat exchanger, a four-way reversing valve + a one-way valve group, a throttling electronic expansion valve and ancillary accessories; refrigerant circulation pipelines and return oil connection pipelines and valves. The above scheme has two main disadvantages: the switching of cooling and heating modes uses a four-way reversing valve + a one-way valve group, the system is complex, the four-way reversing valve has a certain probability of failure, and the switching noise of the reversing valve is very large, which affects the user experience; the current refrigeration cycle system using a screw compressor requires lubrication of the compressor, and the lubricating oil will be separated and recovered in the exhaust and oil separator, but some of the lubricating oil will inevitably enter the heat exchanger; this is even more true for the fluorine-circuit switching system. Both the water source side and the user side heat exchanger need to design complex return oil pipelines, including multiple sets of complex injection return oil pipelines and multiple solenoid valve controls to ensure that both heat exchangers can return oil normally. Once the oil return is not good, the compressor faces the risk of failure or even burning.

[0004] In summary, it is necessary to design an air conditioning heat pump system that can achieve cooling and heating conditions by switching valves inside the system without switching water circuits.

[0005] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0006] In response to the problems pointed out in the background technology, the present invention provides an air-conditioning heat pump system that can achieve oil-free operation and realize cooling and heating conditions only by switching the internal valves of the system without the need for water circuit switching.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0008] In some embodiments of the present application, an air conditioning heat pump system is provided, comprising:

[0009] A compressor, a use-side heat exchanger, a first throttle valve, an economizer, a second throttle valve and a source-side heat exchanger;

[0010] The first throttle valve is arranged at the gas-liquid inlet of the economizer; the second throttle valve is arranged at the liquid outlet of the economizer;

[0011] Wherein, a first one-way valve and a second one-way valve are respectively provided in the connection circuits between the user-side heat exchanger and the source-side heat exchanger and the first throttle valve;

[0012] A third one-way valve and a fourth one-way valve are respectively arranged in the connection circuits between the second throttle valve and the use-side heat exchanger and the source-side heat exchanger.

[0013] In some embodiments of the present application,

[0014] In the heating mode, the inlet of the first one-way valve is connected to the outlet of the user-side heat exchanger, and the outlet of the first one-way valve is connected to the inlet of the first throttle valve;

[0015] The inlet of the second one-way valve is connected to the outlet of the second throttle valve, and the outlet of the second one-way valve is connected to the inlet of the source-side heat exchanger.

[0016] In some embodiments of the present application,

[0017] In cooling mode, the inlet of the third one-way valve is connected to the outlet of the source-side heat exchanger, and the outlet of the third one-way valve is connected to the inlet of the first throttle valve;

[0018] The inlet of the fourth one-way valve is connected to the outlet of the second throttle valve, and the outlet of the fourth one-way valve is connected to the inlet of the user-side heat exchanger.

[0019] In some embodiments of the present application, the exhaust port of the compressor is connected to the gas inlet of the user-side heat exchanger and the gas inlet of the source-side heat exchanger through a first exhaust stop valve and a second exhaust stop valve, respectively, and the intake port of the compressor is connected to the gas outlet of the user-side heat exchanger and the gas outlet of the source-side heat exchanger through a first intake stop valve and a second intake stop valve, respectively.

[0020] In some embodiments of the present application,

[0021] In the heating mode, the first air intake stop valve and the second air exhaust stop valve are in a closed state; the second air intake stop valve and the first air exhaust stop valve are in an open state.

[0022] In some embodiments of the present application,

[0023] In the cooling mode, the second air intake stop valve and the first air exhaust stop valve are in a closed state; the first air intake stop valve and the second air exhaust stop valve are in an open state.

[0024] In some embodiments of the present application,

[0025] A liquid supply bypass pipeline is also provided between the source-side heat exchanger and the use-side heat exchanger, and the liquid supply bypass pipeline is provided with an electronic expansion valve.

[0026] In some embodiments of the present application,

[0027] When the flow rate of the refrigerant in the circulation loop is insufficient, the electronic expansion valve of the liquid supply bypass pipeline is in an open state.

[0028] In some embodiments of the present application,

[0029] The gas outlet of the economizer is connected to the middle gas supply port of the compressor.

[0030] In some embodiments of the present application, an air conditioning heat pump system is provided, comprising:

[0031] A heating circuit, comprising a compressor, a user-side heat exchanger, a first throttle valve, an economizer, a second throttle valve and a source-side heat exchanger connected in sequence;

[0032] A refrigeration circuit, comprising a compressor, a source-side heat exchanger, a second throttle valve, an economizer, a first throttle valve and a user-side heat exchanger connected in sequence;

[0033] Wherein, the heating circuit further includes a first one-way valve connected between the user-side heat exchanger and the first throttle valve; a second one-way valve connected between the second throttle valve and the source-side heat exchanger;

[0034] The refrigeration circuit also includes a third one-way valve connected between the source-side heat exchanger and the first throttle valve; and a fourth one-way valve connected between the second throttle valve and the use-side heat exchanger.

[0035] Compared with the prior art, the advantages and positive effects of the present invention are:

[0036] The present invention adds a one-way valve to the heat pump system, so that cooling and heating conditions can be achieved only by switching the valves inside the system, without switching the water circuits; the unit system is simple and operates without oil, achieving high efficiency and energy saving of the system.

[0037] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 It is a structural connection diagram of an air conditioning heat pump system in the prior art;

[0040] Figure 2 is a schematic diagram of the structural connection of an air conditioning heat pump system according to an embodiment;

[0041] Figure 3 A schematic diagram of the refrigerant flow direction in the heating mode of the air-conditioning heat pump system according to the embodiment;

[0042] Figure 4 A schematic diagram of refrigerant flow in a cooling mode of an air conditioning heat pump system according to an embodiment;

[0043] Figure 5 A schematic diagram of a heating-only mode connection circuit of an air-conditioning heat pump system according to an embodiment;

[0044] Figure 6 A schematic diagram of refrigerant flow in a heating-only mode of an air-conditioning heat pump system according to an embodiment;

[0045] Figure 7 A schematic diagram of a cooling-only mode connection circuit of an air-conditioning heat pump system according to an embodiment;

[0046] Figure 8 A schematic diagram of refrigerant flow in a cooling-only mode of an air-conditioning heat pump system according to an embodiment;

[0047] Fig. 9 It is a schematic structural diagram of an air conditioning heat pump system with an additional bypass loop according to an embodiment.

[0048] Reference numerals:

[0049] 100, compressor; 210, user-side heat exchanger; 220, source-side heat exchanger; 310, first throttle valve; 320, second throttle valve; 330, electronic expansion valve; 400, economizer; 510, first one-way valve; 520, second one-way valve; 530, third one-way valve; 540, fourth one-way valve; 610, first exhaust stop valve; 620, second exhaust stop valve; 710, first suction stop valve; 720, second suction stop valve. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0052] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0053] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0055] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0056] Reference Figure 1 As shown, the existing heat pump unit is a magnetic suspension centrifugal water source heat pump system without intermediate air supply, including an oil-free magnetic suspension centrifugal compressor 100, a use-side heat exchanger, a source-side heat exchanger 220, and a two-way throttling electronic expansion valve 330. The system can realize fluorine circuit reversal through a control strategy, and the user-side machine room water circuit does not need to be switched, and the cooling and heating modes can be quickly switched. Among them, the first air intake stop valve 710, the second air intake stop valve 720, the first exhaust stop valve 610, and the second exhaust stop valve 620 can be manually or electrically operated.

[0057] The use-side heat exchanger 210 and the source-side heat exchanger 220 preferably use shell and tube heat exchangers, but may also use plate heat exchangers or shell and tube heat exchangers.

[0058] The working principle of the heat pump unit is:

[0059] In the refrigeration cycle: the first air intake stop valve 710 and the second air exhaust stop valve 620 are opened, and the second air intake stop valve 720 and the first air exhaust stop valve 610 are closed. The exhaust gas of the compressor 100 enters the source side heat exchanger 220 through the second air exhaust stop valve 620, and its heat is taken away by the cooling water and becomes liquid refrigerant. After the liquid refrigerant is throttled by the two-way flow electronic expansion valve 330, it becomes a low-pressure refrigerant and enters the user side heat exchanger 210. In the user side heat exchanger 210, it absorbs the heat of the cold water and becomes a gas, which enters the compressor 100 through the first air intake stop valve 710. Refrigeration is performed through a repetitive cycle;

[0060] Heating cycle: The first air intake stop valve 710 and the second air exhaust stop valve 620 are closed, and the second air intake stop valve 720 and the first air exhaust stop valve 610 are opened. The exhaust of the compressor 100 enters the user-side heat exchanger 210 through the first air exhaust stop valve 610, and the heat of the gaseous refrigerant is taken away by the hot water and becomes liquid refrigerant. After the liquid refrigerant is throttled by the two-way flow electronic expansion valve 330, it becomes a low-pressure refrigerant and enters the source-side heat exchanger 220. In the source-side heat exchanger 220, it absorbs the heat of the heat source water and becomes a gas, which enters the compressor 100 through the second air intake stop valve 720. Heating is performed through a repetitive cycle.

[0061] In this embodiment, a magnetic levitation centrifugal water source heat pump system with intermediate air supply is proposed. By adding a one-way valve, the fluorine circuit can be reversed. The water circuit in the user-side machine room does not need to be switched, and the cooling and heating modes can be quickly switched.

[0062] Reference Figure 2-Figure 4 As shown, an air conditioning heat pump system is provided, comprising:

[0063] A compressor 100, a use-side heat exchanger 210, a first throttle valve 310, an economizer 400, a second throttle valve 320 and a source-side heat exchanger 220;

[0064] The first throttle valve 310 is disposed at the gas-liquid inlet of the economizer 400; the second throttle valve 320 is disposed at the liquid outlet of the economizer 400;

[0065] Wherein, a first check valve 510 and a second check valve 520 are respectively provided in the connection circuits between the user-side heat exchanger 210 and the source-side heat exchanger 220 and the first throttle valve 310;

[0066] A third one-way valve 530 and a fourth one-way valve 540 are respectively provided in the connection circuits between the second throttle valve 320 and the use-side heat exchanger 210 and the source-side heat exchanger 220 .

[0067] In some embodiments of the present application, the provision of multiple one-way valves can achieve directional flow of refrigerant between the economizer 400 and the use-side heat exchanger 210 and the source-side heat exchanger 220, avoiding the use of a four-way valve, thereby greatly reducing the probability of failure.

[0068] In some embodiments of the present application, refer to Figure 5 As shown, a first one-way valve 510 is arranged between the user-side heat exchanger 210 and the first throttle valve 310 , that is, the refrigerant is conductive in the direction of flowing from the user-side heat exchanger 210 to the first throttle valve 310 .

[0069] In some embodiments of the present application, a second one-way valve 520 is provided between the user-side heat exchanger 210 and the second throttle valve 320 , that is, the refrigerant is conductive in the direction of flowing from the second throttle valve 320 to the user-side heat exchanger 210 .

[0070] In some embodiments of the present application, refer to Figure 6 As shown, in the heating mode, the inlet of the first one-way valve 510 is connected to the outlet of the user-side heat exchanger 210, and the outlet of the first one-way valve 510 is connected to the inlet of the first throttle valve 310;

[0071] The inlet of the second one-way valve 520 is connected to the outlet of the second throttle valve 320 , and the outlet of the second one-way valve 520 is connected to the inlet of the source-side heat exchanger 220 .

[0072] In some embodiments of the present application, when the refrigerant flows from the user-side heat exchanger 210 to the source-side heat exchanger 220, two branches are led out from the outlet of the user-side heat exchanger 210, one branch is connected to the first one-way valve 510, and the other branch is connected to the fourth one-way valve 540; after the refrigerant flows out of the user-side heat exchanger 210, it passes through the first one-way valve 510 and is guided into the first throttle valve 310, and after the refrigerant flows out of the user-side heat exchanger 210, it passes through the fourth one-way valve 540 and is cut off.

[0073] The refrigerant flows out of the economizer 400 , passes through the second throttle, and then reaches the source-side heat exchanger 220 through the second one-way valve 520 .

[0074] In some embodiments of the present application, during the heating process, after the refrigerant enters the user-side heat exchanger 210 through the exhaust port of the compressor 100, the heat of the gaseous refrigerant is taken away by the hot water and becomes a high-pressure liquid refrigerant. After the high-pressure liquid refrigerant flows out of the outlet of the user-side heat exchanger 210, it passes through the first one-way valve 510 and the first throttle valve 310 to become a medium-pressure gas-liquid mixed state, enters the medium-pressure economizer 400 for flashing, and the gaseous refrigerant enters the compressor 100 air supply port through the intermediate pipeline. The liquid flows out of the economizer 400 and enters the second throttle valve 320. After throttling, it becomes a low-pressure refrigerant and enters the source-side heat exchanger 220 through the second one-way valve 520. The source-side heat exchanger 220 absorbs the heat of the heat source water and becomes a gas, which enters the compressor 100 through the second air intake stop valve 720. Heating is performed through a repetitive cycle.

[0075] In some embodiments of the present application, refer to Figure 7 As shown, a third one-way valve 530 is arranged between the source-side heat exchanger 220 and the first throttle valve 310 , that is, the refrigerant is conductive in the direction of flowing from the source-side heat exchanger 220 to the first throttle valve 310 .

[0076] In some embodiments of the present application, a fourth one-way valve 540 is arranged between the source-side heat exchanger 220 and the second throttle valve 320 , that is, the refrigerant is conductive in the direction of flowing from the second throttle valve 320 to the source-side heat exchanger 220 .

[0077] In some embodiments of the present application, refer to Figure 8 As shown, in the cooling mode, the inlet of the third one-way valve 530 is connected to the outlet of the source-side heat exchanger 220, and the outlet of the third one-way valve 530 is connected to the inlet of the first throttle valve 310;

[0078] The inlet of the fourth one-way valve 540 is connected to the outlet of the second throttle valve 320 , and the outlet of the fourth one-way valve 540 is connected to the inlet of the user-side heat exchanger 210 .

[0079] In some embodiments of the present application, when the refrigerant flows from the source-side heat exchanger 220 to the user-side heat exchanger 210, two branches are drawn out from the outlet of the source-side heat exchanger 220, one branch is connected to the third one-way valve 530, and the other branch is connected to the second one-way valve 520; after the refrigerant flows out of the user-side heat exchanger 210, it passes through the third one-way valve 530 and is conducted into the first throttle valve 310, and after the refrigerant flows out of the source-side heat exchanger 220, it passes through the second one-way valve 520 and is cut off. At the same time, after the refrigerant passes through the third one-way valve 530, it is also divided into two branches, one branch is connected to the first throttle valve 310, and the other branch is connected to the first one-way valve 510, but the first one-way valve 510 is cut off for the refrigerant in this direction, so the refrigerant can only flow to the first throttle valve 310 through the third one-way valve 530 after flowing out of the source-side heat exchanger 220.

[0080] The refrigerant flows out of the economizer 400 , passes through the second throttle, and then reaches the user-side heat exchanger 210 through the fourth one-way valve 540 .

[0081] In some embodiments of the present application, the refrigerant enters the source side heat exchanger 220 through the exhaust port of the compressor 100, and its heat is taken away by the cooling water to become a high-pressure liquid refrigerant. After being throttled by the third one-way valve 530 and the first throttle valve 310, the high-pressure liquid refrigerant becomes a medium-pressure gas-liquid mixed state, and enters the medium-pressure economizer 400 for flashing. The gaseous refrigerant enters the air supply port of the compressor 100 through the intermediate pipeline, and the liquid flows out of the economizer 400 and enters the second throttle valve 320 to become a low-pressure refrigerant after throttling, and enters the use side heat exchanger 210 through the fourth one-way valve 540. In the use side heat exchanger 210, it absorbs the heat of cold water and becomes a gas, and enters the compressor 100 through the first air intake stop valve 710. Refrigeration is performed through a repetitive cycle;

[0082] In some embodiments of the present application, the exhaust port of the compressor 100 is connected to the gas inlet of the user-side heat exchanger 210 and the gas inlet of the source-side heat exchanger 220 through the first exhaust stop valve 610 and the second exhaust stop valve 620, respectively, and the intake port of the compressor 100 is connected to the gas outlet of the user-side heat exchanger 210 and the gas outlet of the source-side heat exchanger 220 through the first intake stop valve 710 and the second intake stop valve 720, respectively.

[0083] In some embodiments of the present application, in the heating mode, the first air intake stop valve 710 and the second air exhaust stop valve 620 are in a closed state; the second air intake stop valve 720 and the first air exhaust stop valve 610 are in an open state.

[0084] In some embodiments of the present application, during heating operation, after the refrigerant is discharged from the exhaust port of the compressor 100, it enters the user-side heat exchanger 210 through the first exhaust stop valve 610; after the refrigerant is circulated, it returns to the compressor 100 through the outlet of the source-side heat exchanger 220 through the second suction stop valve 720. Therefore, in the heating mode, the first suction stop valve 710 and the second exhaust stop valve 620 are in a closed state; the second suction stop valve 720 and the first exhaust stop valve 610 are in an open state.

[0085] In some embodiments of the present application, in the cooling mode, the second air intake stop valve 720 and the first air exhaust stop valve 610 are in a closed state; the first air intake stop valve 710 and the second air exhaust stop valve 620 are in an open state.

[0086] In some embodiments of the present application, during refrigeration operation, after the refrigerant is output from the exhaust port of the compressor 100, it enters the source side heat exchanger 220 through the second exhaust stop valve 620; after the refrigerant is circulated, it returns to the compressor 100 through the first suction stop valve 710 from the outlet of the user side heat exchanger 210. Therefore, in the refrigeration mode, the second suction stop valve 720 and the first exhaust stop valve 610 are in a closed state; the first suction stop valve 710 and the second exhaust stop valve 620 are in an open state.

[0087] In some embodiments of the present application, refer to Fig. 9 As shown, a liquid supply bypass pipeline is further provided between the source-side heat exchanger 220 and the user-side heat exchanger 210 , and the liquid supply bypass pipeline is provided with an electronic expansion valve 330 .

[0088] In some embodiments of the present application, when the flow of refrigerant in the circulation loop is insufficient, the electronic expansion valve 330 of the liquid supply bypass line is in an open state, which can enable the refrigerator to flow from the high-pressure side to the low-pressure side to increase the flow in the pipeline.

[0089] In some embodiments of the present application, the gas outlet of the economizer 400 is connected to the middle gas supply port of the compressor 100 .

[0090] In some embodiments of the present application, when the medium-pressure gas-liquid mixed state refrigerant enters the medium-pressure economizer 400 for flashing, the gaseous refrigerant enters the air inlet of the compressor 100 through the intermediate pipeline, and the liquid flows out of the economizer 400 and enters the corresponding heat exchanger.

[0091] In some embodiments of the present application, an air conditioning heat pump system is provided, comprising:

[0092] A heating circuit, which includes a compressor 100, a user-side heat exchanger 210, a first throttle valve 310, an economizer 400, a second throttle valve 320 and a source-side heat exchanger 220 connected in sequence;

[0093] A refrigeration circuit, comprising a compressor 100, a source-side heat exchanger 220, a second throttle valve 320, an economizer 400, a first throttle valve 310 and a user-side heat exchanger 210 connected in sequence;

[0094] The heating circuit further includes a first one-way valve 510 connected between the user-side heat exchanger 210 and the first throttle valve 310; a second one-way valve 520 connected between the second throttle valve 320 and the source-side heat exchanger 220;

[0095] The refrigeration circuit also includes a third one-way valve 530 disposed between the source-side heat exchanger 220 and the first throttle valve 310 ; and a fourth one-way valve 540 disposed between the second throttle valve 320 and the user-side heat exchanger 210 .

[0096] Compared with the prior art, the advantages and positive effects of the present invention are:

[0097] The present invention adds a one-way valve to the heat pump system, so that cooling and heating conditions can be achieved only by switching the valves inside the system, without switching the water circuits; the unit system is simple and operates without oil, achieving high efficiency and energy saving of the system.

[0098] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0099] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. Air conditioning heat pump system, including: A compressor, a use-side heat exchanger, a first throttle valve, an economizer, a second throttle valve and a source-side heat exchanger; The first throttle valve is arranged at the gas-liquid inlet of the economizer; the second throttle valve is arranged at the liquid outlet of the economizer; It is characterized in that a first one-way valve and a second one-way valve are respectively provided in the connection circuits between the user-side heat exchanger and the source-side heat exchanger and the first throttle valve; A third one-way valve and a fourth one-way valve are respectively arranged in the connection circuits between the second throttle valve and the use-side heat exchanger and the source-side heat exchanger.

2. The air conditioning heat pump system according to claim 1, characterized in that: In the heating mode, the inlet of the first one-way valve is connected to the outlet of the user-side heat exchanger, and the outlet of the first one-way valve is connected to the inlet of the first throttle valve; The inlet of the second one-way valve is connected to the outlet of the second throttle valve, and the outlet of the second one-way valve is connected to the inlet of the source-side heat exchanger.

3. The air conditioning heat pump system according to claim 1, characterized in that: In cooling mode, the inlet of the third one-way valve is connected to the outlet of the source-side heat exchanger, and the outlet of the third one-way valve is connected to the inlet of the first throttle valve; The inlet of the fourth one-way valve is connected to the outlet of the second throttle valve, and the outlet of the fourth one-way valve is connected to the inlet of the user-side heat exchanger.

4. The air conditioning heat pump system according to claim 1, characterized in that: The exhaust port of the compressor is connected to the gas inlet of the user-side heat exchanger and the gas inlet of the source-side heat exchanger through the first exhaust stop valve and the second exhaust stop valve, and the intake port of the compressor is connected to the gas outlet of the user-side heat exchanger and the gas outlet of the source-side heat exchanger through the first intake stop valve and the second intake stop valve.

5. The air conditioning heat pump system according to claim 4, characterized in that: In the heating mode, the first air intake stop valve and the second air exhaust stop valve are in a closed state; the second air intake stop valve and the first air exhaust stop valve are in an open state.

6. The air conditioning heat pump system according to claim 4, characterized in that: In the cooling mode, the second air intake stop valve and the first air exhaust stop valve are in a closed state; the first air intake stop valve and the second air exhaust stop valve are in an open state.

7. The air conditioning heat pump system according to claim 1, characterized in that: A liquid supply bypass pipeline is also provided between the source-side heat exchanger and the use-side heat exchanger, and the liquid supply bypass pipeline is provided with an electronic expansion valve.

8. The air conditioning heat pump system according to claim 7, characterized in that: When the flow rate of the refrigerant in the circulation loop is insufficient, the electronic expansion valve of the liquid supply bypass pipeline is in an open state.

9. The air conditioning heat pump system according to claim 1, characterized in that: The gas outlet of the economizer is connected to the middle gas supply port of the compressor.

10. Air conditioning heat pump system, including: A heating circuit, comprising a compressor, a user-side heat exchanger, a first throttle valve, an economizer, a second throttle valve and a source-side heat exchanger connected in sequence; A refrigeration circuit, comprising a compressor, a source-side heat exchanger, a second throttle valve, an economizer, a first throttle valve and a user-side heat exchanger connected in sequence; The heating circuit further comprises a first one-way valve connected between the user-side heat exchanger and the first throttle valve; and a second one-way valve connected between the second throttle valve and the source-side heat exchanger. The refrigeration circuit also includes a third one-way valve connected between the source-side heat exchanger and the first throttle valve; and a fourth one-way valve connected between the second throttle valve and the use-side heat exchanger.

Images