Air conditioning system

Abstract

The present invention relates to an air conditioning system, comprising a compressor, an indoor heat exchanger and an outdoor heat exchanger connected in sequence; a bypass mechanism connected between the outdoor heat exchanger and the exhaust end of the compressor; a first heating mechanism connected between the indoor heat exchanger and the suction end of the compressor; wherein, in the defrosting heating mode, the bypass mechanism is turned on, the refrigerant discharged from the compressor flows to the indoor heat exchanger in one way, and flows to the outdoor heat exchanger in the other way through the bypass mechanism, and the refrigerant flowing out of the indoor heat exchanger flows back to the compressor after passing through at least part of the first heating mechanism. When the air conditioning system is defrosting, continuous heating of the indoor space can still be achieved.

Description

Technical Field

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

[0002] When the air conditioning system is in heating operation, the surface of the outdoor heat exchanger will be frosted due to the influence of ambient temperature and relative humidity. Under the condition of constant ambient temperature, the higher the relative humidity, the faster the outdoor heat exchanger will frost, and the faster the heating of the air conditioning system will decay. Therefore, after a period of heating, the air conditioning system switches to cooling operation mode, relying on the high-temperature and high-pressure refrigerant vapor discharged by the compressor to defrost the outdoor heat exchanger.

[0003] However, the above-mentioned defrosting method will cause the indoor unit side of the air-conditioning system to be unable to heat continuously, and the more frequent the defrosting, the more frequent the indoor temperature fluctuations, and the longer each defrosting lasts, the greater the indoor temperature fluctuations. Summary of the invention

[0004] Based on this, it is necessary to provide an air conditioning system that can continuously heat the indoor side during defrosting in order to address the problem that the traditional air conditioning system cannot achieve continuous heating of the indoor side during defrosting.

[0005] An air conditioning system comprises a compressor, an indoor heat exchanger and an outdoor heat exchanger which are connected in sequence;

[0006] A bypass mechanism connected between the outdoor heat exchanger and the exhaust end of the compressor;

[0007] a first heating mechanism connected between the indoor heat exchanger and the suction end of the compressor;

[0008] Among them, in the defrosting and heating mode, the bypass mechanism is turned on, and the refrigerant discharged from the compressor flows to the indoor heat exchanger in one path and flows to the outdoor heat exchanger through the bypass mechanism in the other path. At least part of the refrigerant flowing out of the indoor heat exchanger flows back to the compressor after passing through the first heating mechanism.

[0009] In one embodiment, the air conditioning system further comprises a first throttling mechanism, wherein the first throttling mechanism is connected between the indoor heat exchanger and the outdoor heat exchanger;

[0010] One end of the bypass mechanism is connected to the exhaust end of the compressor, and the other end is connected between the first throttling mechanism and the outdoor heat exchanger or directly connected to the outdoor heat exchanger;

[0011] Wherein, in the defrost mode, the bypass mechanism is turned on, and the first throttling mechanism is turned on or off.

[0012] In one embodiment, one end of the first heating mechanism is connected between the indoor heat exchanger and the first throttling mechanism or directly connected to the indoor heat exchanger, and the other end is connected to the suction end of the compressor.

[0013] In one embodiment, the bypass mechanism includes a bypass pipeline and a first on-off valve, one end of the bypass pipeline is connected to the exhaust end of the compressor, and the other end is connected to the outdoor heat exchanger, and the first on-off valve is installed on the bypass pipeline.

[0014] In one embodiment, the air conditioning system further includes a second throttling mechanism, one end of the second throttling mechanism is connected to the indoor heat exchanger, and the other end of the second throttling mechanism is connected to the first heating mechanism.

[0015] In one embodiment, the air conditioning system further comprises a gas-liquid separator, the gas-liquid separator having a first inlet and an outlet, the first inlet being connected to the outdoor heat exchanger, and the outlet being connected to the suction end of the compressor;

[0016] Wherein, the gas-liquid separator further has a second inlet, and the second inlet is connected to the first heating mechanism.

[0017] In one embodiment, the air conditioning system further comprises a gas-liquid separator, the gas-liquid separator having a first inlet and an outlet, the first inlet being connected to the outdoor heat exchanger, and the outlet being connected to the suction end of the compressor;

[0018] The gas-liquid separator also has a liquid discharge port;

[0019] The air conditioning system further includes a second heating mechanism, which is connected between the liquid discharge port of the gas-liquid separator and the air intake end of the compressor.

[0020] In one embodiment, the air conditioning system further includes a pressure balancing valve, and the pressure balancing valve is connected between the outlet of the gas-liquid separator and the second heating mechanism.

[0021] In one of the embodiments, the air conditioning system further comprises a second heating mechanism;

[0022] The second heating mechanism is communicated between the discharge end of the first heating mechanism and the suction end of the compressor.

[0023] In one embodiment, the suction end of the compressor is provided with a suction port and an enthalpy increase port, and at least part of the refrigerant flowing out of the indoor heat exchanger flows back to the suction port and / or enthalpy increase port of the compressor after passing through the first heating mechanism.

[0024] In one embodiment, the air-conditioning system further includes a first connecting pipe, a second connecting pipe, a second on-off valve and a third on-off valve, the two ends of the first connecting pipe are respectively connected to the discharge end of the first heating mechanism and the intake port of the compressor, the two ends of the second connecting pipe are respectively connected to the discharge end of the first heating mechanism and the enthalpy increase port of the compressor, the second on-off valve is installed on the first connecting pipe, and the third on-off valve is installed on the second connecting pipe.

[0025] In one of the embodiments, the air conditioning system further comprises a second heating mechanism;

[0026] The second heating mechanism is connected between the discharge end of the first heating mechanism and the suction end of the compressor;

[0027] Wherein, both ends of the first connecting pipe are respectively connected to the discharge end of the second heating mechanism and the air intake port of the compressor, and both ends of the second connecting pipe are respectively connected to the discharge end of the second heating mechanism and the enthalpy increase port of the compressor.

[0028] In one embodiment, the first heating mechanism is connected between the outdoor heat exchanger and the suction end of the compressor, and the refrigerant flowing out of the outdoor heat exchanger flows back to the compressor after passing through the first heating mechanism.

[0029] In one embodiment, the air conditioning system further includes a third connecting pipe and a fourth connecting pipe, one end of the third connecting pipe is connected to the indoor heat exchanger and passes through the first heating mechanism, and the other end is connected to the enthalpy increase port of the compressor, and one end of the fourth connecting pipe is connected to the outdoor heat exchanger and passes through the first heating mechanism, and the other end is connected to the air intake port of the compressor;

[0030] The air conditioning system further includes a fifth connecting pipeline and a fourth on-off valve, wherein the fifth connecting pipeline is connected between the third connecting pipeline and the fourth connecting pipeline, and the fourth on-off valve is mounted on the fifth connecting pipeline;

[0031] Wherein, the connection points of the fifth connecting pipeline with the third connecting pipeline and the fourth connecting pipeline are all located upstream of the liquid inlet end of the first heating mechanism.

[0032] In one of the embodiments, the air conditioning system further includes a fifth on-off valve, which is mounted on the third connecting pipeline and located between the first heating mechanism and the enthalpy increase port of the compressor.

[0033] In one embodiment, the first heating mechanism is an electric heating mechanism.

[0034] When defrosting is required, the above-mentioned air conditioning system controls the bypass mechanism to be turned on, so that the high-temperature and high-pressure gaseous refrigerant discharged from the compressor flows to the indoor heat exchanger for heat exchange in one path, and flows to the outdoor heat exchanger through the bypass mechanism to defrost the outdoor heat exchanger in the other path. Among them, the refrigerant after heat exchange with the indoor heat exchanger is heated by the first heating mechanism and then flows back to the compressor, and the refrigerant after defrosting the outdoor heat exchanger flows back to the compressor. In this way, when the air conditioning system is defrosting, it is still possible to heat the indoor space, ensuring the continuity of heating, thereby reducing the fluctuation of the indoor temperature during defrosting. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of an air conditioning system provided in accordance with a first embodiment of the present invention;

[0036] Figure 2 A schematic diagram of an air conditioning system provided for a second embodiment of the present invention;

[0037] Figure 3 A flowchart of a method for controlling an air conditioning system provided by an embodiment of the present invention.

[0038] Air conditioning system 100 compressor 10 indoor heat exchanger 20 first throttling mechanism 30 outdoor heat exchanger 40 bypass mechanism 50 bypass pipeline 51 first on-off valve 52 first heating mechanism 60 four-way valve 70 second throttling mechanism 80 gas-liquid separator 90 second heating mechanism 110 liquid outlet pipe 120 liquid outlet valve 130 pressure balance valve 140 first connecting pipeline 150 second connecting pipeline 160 second on-off valve 170 third on-off valve 180 third connecting pipeline 200 fourth connecting pipeline 210 fifth connecting pipeline 220 fourth on-off valve 230 fifth on-off valve 240 DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] See also Figure 1 An embodiment of the present invention provides an air conditioning system 100, including a compressor 10, an indoor heat exchanger 20 and an outdoor heat exchanger 40 connected in sequence. Specifically, the compressor 10, the indoor heat exchanger 20 and the outdoor heat exchanger 40 are all connected through pipelines.

[0043] Specifically, the air conditioning system 100 further includes a first throttling mechanism 30, and the compressor 10, the indoor heat exchanger 20, the first throttling mechanism 30 and the outdoor heat exchanger 40 are sequentially connected through pipelines.

[0044] During heating, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 enters the indoor heat exchanger 20 for heat exchange. At this time, the gaseous refrigerant condenses into a high-pressure liquid and, after being throttled by the first throttling mechanism 30, becomes a low-temperature and low-pressure saturated liquid refrigerant and enters the outdoor heat exchanger 40 to evaporate and then flows back to the compressor 10. This cycle is repeated over and over again to achieve the purpose of heating.

[0045] The air conditioning system 100 further includes a bypass mechanism 50 and a first heating mechanism 60. The bypass mechanism 50 is connected between the outdoor heat exchanger 40 and the exhaust end of the compressor 10, and the first heating mechanism 60 is connected between the indoor heat exchanger 20 and the suction end of the compressor 10. By operating the bypass mechanism 50, the air conditioning system 100 can be switched between the normal heating mode and the defrosting heating mode.

[0046] When the air-conditioning system 100 is in normal heating mode (when the outdoor heat exchanger 40 does not need to be defrosted), the bypass mechanism 50 is controlled to be disconnected, so that all the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 enters the indoor heat exchanger 20 for heat exchange, and at least part of the refrigerant after heat exchange with the indoor heat exchanger 20 enters the outdoor heat exchanger 40, and flows back to the compressor 10 after heat exchange with the outdoor heat exchanger 40.

[0047] When the air conditioning system 100 is in defrosting heating mode (when the outdoor heat exchanger 40 needs to be defrosted), the bypass mechanism 50 is controlled to be turned on, so that the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 flows to the indoor heat exchanger 20 for heat exchange, and flows to the outdoor heat exchanger 40 through the bypass mechanism 50 to defrost the outdoor heat exchanger 40. Among them, at least part of the refrigerant after heat exchange with the indoor heat exchanger 20 is heated by the first heating mechanism 60 and then flows back to the compressor 10, and the refrigerant after defrosting the outdoor heat exchanger 40 flows back to the compressor 10.

[0048] Through the above arrangement, when the air conditioning system 100 needs to be defrosted, the indoor space can still be heated, thereby ensuring the continuity of heating and reducing the fluctuation of the indoor temperature during defrosting.

[0049] It should be noted that, in the normal heating mode, at least part of the refrigerant after heat exchange with the indoor heat exchanger 20 flows to the outdoor heat exchanger 40, including:

[0050] At least part of the refrigerant after heat exchange with the indoor heat exchanger 20 flows to the outdoor heat exchanger 40 after throttling by the first throttling mechanism 30; or at least part of the refrigerant after heat exchange with the indoor heat exchanger 20 flows to the outdoor heat exchanger 40 after throttling by the first throttling mechanism 30.

[0051] Specifically, one end of the bypass mechanism 50 is connected to the exhaust end of the compressor 10, and the other end is connected between the first throttling mechanism 30 and the outdoor heat exchanger 40; one end of the first heating mechanism 60 is connected between the indoor heat exchanger 20 and the first throttling mechanism 30, and the other end is connected to the suction end of the compressor 10. By operating the bypass mechanism 50 and the first throttling mechanism 30, the air conditioning system 100 can be switched between the normal heating mode and the defrosting heating mode.

[0052] When the air-conditioning system 100 is in normal heating mode (when the outdoor heat exchanger 40 does not need to be defrosted), the bypass mechanism 50 is controlled to be disconnected and the first throttling mechanism 30 is turned on, so that all the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 enters the indoor heat exchanger 20 for heat exchange, and at least a portion of the refrigerant after heat exchange with the indoor heat exchanger 20 enters the outdoor heat exchanger 40 after throttling through the first throttling mechanism 30, and flows back to the compressor 10 after heat exchange with the outdoor heat exchanger 40.

[0053] When the air-conditioning system 100 is in the defrosting heating mode (when the outdoor heat exchanger 40 needs to be defrosted), the bypass mechanism 50 is controlled to be turned on, and the first throttling mechanism 30 is turned off. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 flows to the indoor heat exchanger 20 for heat exchange in one path, and flows to the outdoor heat exchanger 40 through the bypass mechanism 50 to defrost the outdoor heat exchanger 40 in the other path. Among them, all the refrigerant after heat exchange with the indoor heat exchanger 20 is heated by the first heating mechanism 60 and then flows back to the compressor 10, and the refrigerant after defrosting the outdoor heat exchanger 40 flows back to the compressor 10; or the air-conditioning system 100 is in the defrost mode, the bypass mechanism 50 is controlled to be turned on, the first throttling mechanism 30 is turned on, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 flows to the indoor heat exchanger 20 for heat exchange in one way, and flows to the outdoor heat exchanger 40 through the bypass mechanism 50 in the other way, the refrigerant after heat exchange with the indoor heat exchanger 20 is heated by the first heating mechanism 60 and then flows back to the compressor 10 in one way, and is mixed with the refrigerant flowing out of the bypass mechanism 50 and flows to the outdoor heat exchanger 40 for defrosting in the other way.

[0054] Continue reading Figure 1 , in the first embodiment:

[0055] The air-conditioning system 100 also includes a four-way valve 70, which has a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is connected to the indoor heat exchanger 20, the second valve port is connected to the exhaust end of the compressor 10, the third valve port is connected to the outdoor heat exchanger 40, and the fourth valve port is connected to the suction end of the compressor 10.

[0056] In normal heating mode and defrosting heating mode, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port. In cooling mode, the second valve port is connected to the third valve port, and the first valve port is connected to the fourth valve port.

[0057] By configuring the air conditioning system 100 to include the four-way valve 70, the air conditioning system 100 can have both heating and cooling functions. It is understandable that in other embodiments, the air conditioning system 100 can also omit the four-way valve 70, and in this case, the air conditioning system 100 can only have the heating function, which is not limited here.

[0058] The bypass mechanism 50 includes a bypass pipeline 51 and a first on-off valve 52. One end of the bypass pipeline 51 is connected between the exhaust end of the compressor 10 and the four-way valve 70, and the other end of the bypass pipeline 51 is connected between the first throttling mechanism 30 and the outdoor heat exchanger 40. The first on-off valve 52 is mounted on the bypass pipeline 51. The on-off of the bypass pipeline 51 can be controlled by controlling the on-off of the first on-off valve 52. It can be understood that in other embodiments, one end of the bypass pipeline 51 can also be connected between the four-way valve 70 and the indoor heat exchanger 20, and the other end of the bypass pipeline 51 is connected between the first throttling mechanism 30 and the outdoor heat exchanger 40, which is not limited here.

[0059] Specifically, the first on-off valve 52 is a solenoid valve, which opens when powered on and closes when powered off, thereby connecting or disconnecting the bypass line 51. It can be understood that in other embodiments, the first on-off valve 52 can also be a manual valve, which is not limited here.

[0060] The air conditioning system 100 further includes a second throttling mechanism 80, one end of which is connected between the indoor heat exchanger 20 and the first throttling mechanism 30, and the other end of which is connected to the first heating mechanism 60, that is, both ends of the first heating mechanism 60 are respectively connected to the second throttling mechanism 80 and the suction end of the compressor 10. In this way, the refrigerant flowing from the indoor heat exchanger 20 to the first heating mechanism 60 is first throttled by the second throttling mechanism 80 and then flows to the first heating mechanism 60 for heating.

[0061] By setting the second throttling mechanism 80, not only can the throttling of the refrigerant to the first heating mechanism 60 be achieved, but also it is convenient to control whether the refrigerant flows to the first heating mechanism 60 for heating. For example, in the normal heating mode, the second throttling mechanism 80 is disconnected, and the refrigerant flowing out of the indoor heat exchanger 20 will all flow to the first throttling mechanism 30 after throttling and then flow to the outdoor heat exchanger 40; in the cooling mode, the second throttling mechanism 80 can also be disconnected, and the refrigerant flowing out of the outdoor heat exchanger 40 will all flow to the indoor heat exchanger 20 for heat exchange after passing through the first throttling mechanism 30. In the normal heating mode, the second throttling mechanism 80 can also be turned on. At this time, a part of the refrigerant flowing out of the indoor heat exchanger 20 flows to the first throttling mechanism 30 for throttling and then flows to the outdoor heat exchanger 40, and the other part flows to the first heating mechanism 60 for heating after being throttled by the second throttling mechanism 80 and then flows to the suction end of the compressor 10; in the cooling mode, the second throttling mechanism 80 can also be turned on. At this time, a part of the refrigerant flowing out of the outdoor heat exchanger 40 flows to the indoor heat exchanger 20 for heat exchange after being throttled by the first throttling mechanism 30, and the other part flows to the first heating mechanism 60 for heating after being throttled by the second throttling mechanism 80 and then flows to the suction end of the compressor 10.

[0062] The air conditioning system 100 further includes a gas-liquid separator 90, which has a first inlet and an outlet, wherein the first inlet is connected to the fourth valve port of the four-way valve 70, and the outlet is connected to the suction end of the compressor 10. During heating (including normal heating mode and defrosting heating mode), the third valve port of the four-way valve 70 is connected to the fourth valve port, and at this time, the gas-liquid separator 90 is connected between the outdoor heat exchanger 40 and the suction end of the compressor 10, so that the refrigerant after heat exchange with the outdoor heat exchanger 40 passes through the gas-liquid separator 90 for gas-liquid separation and then flows to the suction end of the compressor 10.

[0063] Specifically, the suction end of the compressor 10 is provided with a suction port and an enthalpy increase port, and the outlet of the gas-liquid separator 90 is connected to the suction port of the compressor 10 , so that all the gas separated from the gas-liquid separator 90 enters the compressor 10 from the suction port of the compressor 10 .

[0064] The air conditioning system 100 further includes a second heating mechanism 110. The gas-liquid separator 90 has a liquid discharge port. The second heating mechanism 110 is connected between the liquid discharge port of the gas-liquid separator 90 and the air intake end of the compressor 10. Through the above arrangement, the liquid separated by the gas-liquid separator 90 can be heated by the second heating mechanism 110 to form a gas that flows to the air intake end of the compressor 10.

[0065] Specifically, the second heating mechanism 110 is connected between the end of the first heating mechanism 60 that is not connected to the second throttling mechanism 80 and the suction end of the compressor 10, that is, the first heating mechanism 60 is connected to the suction end of the compressor 10 through the second heating mechanism 110. The refrigerant is heated by the first heating mechanism 60 and flows to the second heating mechanism 110, and the liquid formed after separation by the gas-liquid separator 90 is heated again by the second heating mechanism 110 and enters the suction end of the compressor 10, so as to ensure that the refrigerant entering the suction end of the compressor 10 is not mixed with liquid.

[0066] It can be understood that in other embodiments, the first heating mechanism 60 may also be connected to the suction end of the compressor 10 without passing through the second heating mechanism 110, that is, the first heating mechanism 60 is directly connected to the suction end of the compressor 10. In other embodiments, the end of the first heating mechanism 60 that is not connected to the second throttling mechanism 80 is connected to the gas-liquid separator 90. In this way, the refrigerant heated by the first heating mechanism 60 enters the suction end of the compressor 10 after the gas-liquid separation in the gas-liquid separator 90, which is not limited here.

[0067] When the first heating mechanism 60 is connected to the air intake end of the compressor 10 through the second heating mechanism 110, the air conditioning system 100 further includes a pressure balancing valve 140, and both ends of the pressure balancing valve 140 are respectively connected to the discharge end of the first heating mechanism 60 and the outlet of the gas-liquid separator 90. In this way, the pressure between the refrigerant flowing out of the first heating mechanism 60 and the gas-liquid separator 90 can be balanced, so that the liquid separated from the gas-liquid separator 90 can more easily enter the second heating mechanism 110 from its liquid outlet.

[0068] In this embodiment, the air-conditioning system 100 also includes a liquid outlet pipe 120 connected between the discharge port of the gas-liquid separator 90 and the second heating mechanism 110, and a liquid outlet valve 130 installed on the liquid outlet pipe 120. The liquid outlet valve 130 can be used to control whether the liquid separated from the gas-liquid separator 90 flows into the second heating mechanism 110 for heating.

[0069] Specifically, the first heating mechanism 60 can be selectively connected to the air intake port or the enthalpy increase port of the compressor 10. The air conditioning system 100 includes a first connecting line 150, a second connecting line 160, a second on-off valve 170 and a third on-off valve 180. The first connecting line 150 is connected between the second heating mechanism 110 and the air intake port of the compressor 10, the second connecting line 160 is connected between the second heating mechanism 110 and the enthalpy increase port of the compressor 10, the second on-off valve 170 is mounted on the first connecting line 150 to control the on-off of the first connecting line 150, and the third on-off valve 180 is mounted on the second connecting line 160 to control the on-off of the second connecting line 160.

[0070] Through the above-mentioned arrangement, the discharge end of the first heating mechanism 60 is connected to the intake port or the enthalpy increase port of the compressor 10 through the second heating mechanism 110, that is, when the second on-off valve 170 is opened and the third on-off valve 180 is closed, the second heating mechanism 110 is connected to the intake port of the compressor 10, and the gas flowing out of the second heating mechanism 110 flows from the intake port to the compressor 10, which is used for replenishing air to the compressor 10; when the second on-off valve 170 is closed and the third on-off valve 180 is opened, the second heating mechanism 110 is connected to the enthalpy increase port of the compressor 10, and the gas flowing out of the second heating mechanism 110 flows to the enthalpy increase port of the compressor 10, which is used for increasing the enthalpy of the compressor 10.

[0071] It can be understood that in other embodiments, the above-mentioned first connecting pipe 150 can also be directly connected between the first heating mechanism 60 and the intake port of the compressor 10, and the second connecting pipe 160 can also be directly connected between the first heating mechanism 60 and the enthalpy increase port of the compressor 10, which is not limited here.

[0072] Further, one end of the second communicating pipeline 160 is directly connected to the second heating mechanism 110, one end of the first communicating pipeline 150 is indirectly connected to the second heating mechanism 110 through the second communicating pipeline 160, and the first communicating pipeline 150 converges on the pipeline connecting the gas-liquid separator 90 and the air intake of the compressor 10 and is connected to the air intake of the compressor 10, that is, the other end of the first communicating pipeline 150 is indirectly connected to the air intake of the compressor 10 through the pipeline connecting the gas-liquid separator 90 and the air intake of the compressor 10. In other embodiments, the connection positions of the two ends of the first communicating pipeline 150 and the two ends of the second communicating pipeline 160 are not limited, as long as the two ends of the first communicating pipeline 150 can be respectively connected to the second heating mechanism 110 and the air intake of the compressor 10, and the two ends of the second communicating pipeline 160 can be respectively connected to the second heating mechanism 110 and the enthalpy increase port of the compressor 10, which is not limited here.

[0073] Specifically, the second on-off valve 170 and the third on-off valve 180 are both solenoid valves, which are opened when energized and closed when de-energized, thereby realizing the connection or disconnection of the bypass pipeline 51. It can be understood that in other embodiments, the second on-off valve 170 and the third on-off valve 180 can also be manual valves, which is not limited here.

[0074] In this specific embodiment, the first heating mechanism 60 and the second heating mechanism 110 are both electric heating mechanisms. Specifically, the first heating mechanism 60 includes a shell and an electric heating tube, which is disposed in the shell and exchanges heat with the refrigerant flowing through the pipeline.

[0075] The working principle of the air conditioning system 100 provided in the first embodiment is as follows:

[0076] In normal heating mode:

[0077] The first valve port of the four-way valve 70 is connected to the second valve port, the third valve port is connected to the fourth valve port, and the first on-off valve 52 is disconnected, so that the first throttling mechanism 30 is connected to the second throttling mechanism 80 .

[0078] The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 enters the four-way valve 70 through the second valve port of the four-way valve 70, and flows from the first valve port to the indoor heat exchanger 20 to release heat and condense. The refrigerant after release heat and condensation flows to the outdoor heat exchanger 40 after being throttled by the first throttling mechanism 30, and evaporates in the outdoor heat exchanger 40. The evaporated low-temperature and low-pressure gaseous refrigerant flows to the four-way valve 70 through the third valve port, and is separated from the fourth valve port by the gas-liquid separator 90 and flows back to the compressor 10, completing the heating cycle. The refrigerant after release heat and condensation flows to the first heating mechanism 60 after being throttled by the second throttling mechanism 80 for heating and evaporation. The heated and evaporated refrigerant flows to the second heating mechanism 110 for heating and evaporation again, and when the liquid outlet valve 130 is opened, the liquid separated from the gas-liquid separator 90 can enter the second heating mechanism 110 for heating and evaporation together with the refrigerant entering from the first heating mechanism 60.

[0079] The evaporated refrigerant can be used to replenish air or increase enthalpy of the compressor 10 by controlling the on-off of the second on-off valve 170 and the third on-off valve 180. Specifically, when the second on-off valve 170 is opened and the third on-off valve 180 is closed, the part of the refrigerant and the gas separated by the gas-liquid separator 90 are returned to the air intake port of the compressor 10 for replenishing air of the compressor 10; when the second on-off valve 170 is closed and the third on-off valve 180 is opened, the part of the refrigerant is returned to the enthalpy increase port of the compressor 10 for increasing enthalpy of the compressor 10.

[0080] It is understandable that in the above-mentioned normal heating mode, the second throttling mechanism 80 can also be disconnected. At this time, it will not be possible to replenish air or increase enthalpy for the compressor 10, but normal heating of the air-conditioning system 100 can still be guaranteed.

[0081] In defrost heating mode:

[0082] The first valve port of the four-way valve 70 is connected to the second valve port, the third valve port is connected to the fourth valve port, the first on-off valve 52 is turned on, the first throttling mechanism 30 is closed, and the second throttling mechanism 80 is turned on.

[0083] The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 flows to the indoor heat exchanger 20 through the four-way valve 70. After the refrigerant in the indoor heat exchanger 20 is throttled by the second throttling mechanism 80, it flows to the first heating mechanism 60 for heating and evaporation. The refrigerant after heating and evaporation flows to the second heating mechanism 110 for heating and evaporation again. The above-mentioned evaporated refrigerant can be used to control the on-off of the second on-off valve 170 and the third on-off valve 180 to achieve air replenishment or enthalpy increase of the compressor 10. Specifically: when the second on-off valve 170 is opened and the third on-off valve 180 is closed, this part of the refrigerant and the gas separated by the gas-liquid separator 90 are refluxed to the air intake port of the compressor 10 for air replenishment of the compressor 10; when the second on-off valve 170 is closed and the third on-off valve 180 is opened, this part of the refrigerant flows back to the enthalpy increase port of the compressor 10 for enthalpy increase of the compressor 10.

[0084] The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 flows to the outdoor heat exchanger 40 through the bypass line 51 for defrosting, and flows to the gas-liquid separator 90 through the four-way valve 70 for separation and then flows back to the compressor 10; and the liquid formed after separation by the gas-liquid separator 90 can flow to the second heating mechanism 110 through the liquid outlet pipe 120, and together with the gas heated and evaporated by the first heating mechanism 60, it is heated and evaporated by the second heating mechanism 110 and used to replenish air or increase enthalpy in the compressor 10.

[0085] Alternatively, the first valve port of the four-way valve 70 is connected to the second valve port, the third valve port is connected to the fourth valve port, the first on-off valve 52 is turned on, the first throttling mechanism 30 is turned on, and the second throttling mechanism 80 is turned on.

[0086] The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 flows to the indoor heat exchanger 20 through the four-way valve 70 on one path, and flows to the outdoor heat exchanger 40 through the bypass pipe 51 on the other path. The refrigerant after heat exchange in the indoor heat exchanger 20 flows to the first heating mechanism 60 for heating and evaporation after throttling through the second throttling mechanism 80 on one path, and flows to the second heating mechanism 110 for heating and evaporation again after heating and evaporation on the other path. The refrigerant after heat exchange in the indoor heat exchanger 20 flows to the outdoor heat exchanger 40 together with the refrigerant flowing out through the bypass mechanism 51 after throttling through the first throttling mechanism 30 to defrost it.

[0087] In cooling mode:

[0088] The second valve port of the four-way valve 70 is connected to the third valve port, the first valve port is connected to the fourth valve port, the first on-off valve 52 is closed, and the first throttling mechanism 30 is connected to the second throttling mechanism 80 .

[0089] The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 flows to the outdoor heat exchanger 40 through the four-way valve 70 to release heat and condense. The refrigerant after release heat and condensation is throttled by the first throttling mechanism 30 and flows to the indoor heat exchanger 20. It exchanges heat and evaporates in the indoor heat exchanger 20. The evaporated low-temperature and low-pressure gaseous refrigerant flows to the gas-liquid separator 90 through the four-way valve 70 and is separated and then flows back to the compressor 10, completing the refrigeration cycle. The refrigerant after release heat and condensation is throttled by the first throttling mechanism 30 and then throttled by the second throttling mechanism 80 to flow to the first heating mechanism 60, heated and evaporated. The heated and evaporated refrigerant flows to the second heating mechanism 110 to be heated and evaporated again. After being heated and evaporated by the second heating mechanism 110, it is used to replenish air or increase enthalpy in the compressor 10.

[0090] It is understandable that under the above-mentioned refrigeration, the second throttling mechanism 80 can also be disconnected. At this time, it will be impossible to supplement air or increase enthalpy for the compressor 10, but the normal refrigeration of the air-conditioning system 100 can still be guaranteed.

[0091] See also Figure 2 In the second embodiment, the difference from the first embodiment is that:

[0092] The first heating mechanism 60 is connected and arranged between the outdoor heat exchanger 40 and the gas-liquid separator 90. The refrigerant flowing out of the outdoor heat exchanger 40 is heated by the first heating mechanism 60 and then flows back to the suction end of the compressor 10. In this way, the refrigerant flowing out of the outdoor heat exchanger 40 is first heated and evaporated by the first heating mechanism 60 and then flows to the gas-liquid separator 90 for separation, which reduces the working pressure of the gas-liquid separator 90.

[0093] Furthermore, in this embodiment, the refrigerant flowing out of the outdoor heat exchanger 40 is first heated and evaporated by the first heating mechanism 60 before flowing to the gas-liquid separator 90. Therefore, the liquid separated by the gas-liquid separator 90 is relatively small, so the second heating mechanism 110 can be omitted.

[0094] In this embodiment, the air-conditioning system 100 also includes a third connecting pipe 200, a fourth connecting pipe 210, a fifth connecting pipe 220 and a fourth on-off valve 230. One end of the third connecting pipe 200 is connected between the first throttling mechanism 30 and the indoor heat exchanger 20, and the other end is connected to the enthalpy increase port of the compressor 10. Both ends of the fourth connecting pipe 210 are respectively connected to the outdoor heat exchanger 40 and the suction port of the compressor 10. The third connecting pipe 200 is used to circulate the refrigerant flowing out of the indoor heat exchanger 20 and exchange heat with the first heating mechanism 60. The fourth connecting pipe 210 is used to circulate the refrigerant flowing out of the outdoor heat exchanger 40 and exchange heat with the first heating mechanism 60. The fifth connecting pipe 220 is connected between the third connecting pipe 200 and the fourth connecting pipe 210. Specifically, the connection points of the fifth connecting line 220 with the third connecting line 200 and the fourth connecting line 210 are all located upstream of the liquid inlet end of the first heating mechanism 60 , and the fourth on-off valve 230 is assembled on the fifth connecting line 220 .

[0095] Through the above arrangement, when the fourth on-off valve 230 is opened, the two pipelines can be brought together before entering the first heating mechanism 60 for heating, thereby being connected to the gas-liquid separator 90 through one of the pipelines.

[0096] Specifically, the fourth connecting line 210 is connected to the air inlet of the compressor 10 through the gas-liquid separator 90, and the third connecting line 200 is directly connected to the enthalpy increase port of the compressor 10. In this way, when the fourth on-off valve 230 is opened, the refrigerant formed after heat exchange with the indoor heat exchanger 20 flows to the fourth connecting line 210 through the fifth connecting line 220 and flows to the gas-liquid separator 90 after being heated by the first heating mechanism 60, and the gas separated by the gas-liquid separator 90 enters the air inlet of the compressor 10; the refrigerant formed after heat exchange with the indoor heat exchanger 20 flows to the enthalpy increase port of the compressor 10 through the third connecting line 200 and flows to the enthalpy increase port of the compressor 10 after being heated by the first heating mechanism 60, and is used for enthalpy increase of the compressor 10.

[0097] Furthermore, the air-conditioning system 100 also includes a fifth on-off valve 240, which is installed on the third connecting pipe 200 and located between the first heating mechanism 60 and the compressor 10. The fifth on-off valve 240 is used to control the on-off of the third connecting pipe 200, thereby controlling whether to increase enthalpy for the compressor 10.

[0098] In this embodiment, since the air replenishment and enthalpy increase of the compressor 10 can be achieved by controlling the on and off of the fourth on-off valve 230 and the fifth on-off valve 240, the first connecting pipeline 150, the second connecting pipeline 160, the second on-off valve 170 and the third on-off valve 180 in the above embodiment can be omitted.

[0099] It can be understood that in other embodiments, even if the air replenishment and enthalpy increase of the compressor 10 can be achieved by opening and closing the fourth on-off valve 230 and the fifth on-off valve 240, the first connecting line 150, the second connecting line 160, the second on-off valve 170 and the third on-off valve 180 can still be selected to be set. At this time, one end of the first connecting line 150 and the second connecting line 160 can be connected to the air outlet end of the third connecting line 200, the other end of the first connecting line 150 is connected to the air intake port of the compressor 10, and the other end of the second connecting line 160 is connected to the enthalpy increase port of the compressor 10, which is not limited here.

[0100] The working principle of the air conditioning system 100 provided in the second embodiment is as follows:

[0101] In normal heating mode:

[0102] The first valve port of the four-way valve 70 is connected to the second valve port, the third valve port is connected to the fourth valve port, and the first on-off valve 52 is disconnected, so that the first throttling mechanism 30 is connected to the second throttling mechanism 80 .

[0103] The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 enters the four-way valve 70 through the second valve port of the four-way valve 70, and flows from the first valve port to the indoor heat exchanger 20 to release heat and condense. The refrigerant after release heat and condensation is throttled by the first throttling mechanism 30 and flows to the outdoor heat exchanger 40, where it exchanges heat and evaporates. The evaporated low-temperature and low-pressure gaseous refrigerant flows to the four-way valve 70 through the third valve port, and flows from the fourth valve port to the gas-liquid separator 90 for separation after being heated by the first heating mechanism 60, and then flows back to the compressor 10, completing the heating cycle. The other path of the refrigerant after heat release and condensation is throttled by the second throttling mechanism 80 and then flows to the first heating mechanism 60. When the fourth on-off valve 230 is opened and the fifth on-off valve 240 is closed, the refrigerant is heated by the first heating mechanism 60 and then flows back to the gas-liquid separator 90 for separation and then flows back to the intake port of the compressor 10 for air replenishment. When the fourth on-off valve 230 is closed and the fifth on-off valve 240 is opened, the refrigerant is heated by the first heating mechanism 60 and then flows directly back to the enthalpy increase port of the compressor 10 for enthalpy increase.

[0104] It is understandable that in the above-mentioned normal heating mode, the second throttling mechanism 80 can also be disconnected. At this time, it will not be possible to replenish air or increase enthalpy for the compressor 10, but normal heating of the air-conditioning system 100 can still be guaranteed.

[0105] In defrost heating mode:

[0106] The first valve port of the four-way valve 70 is connected to the second valve port, the third valve port is connected to the fourth valve port, the first on-off valve 52 is turned on, the first throttling mechanism 30 is closed, and the second throttling mechanism 80 is turned on.

[0107] The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 flows through the four-way valve 70 to the outdoor heat exchanger 40, is defrosted in the outdoor heat exchanger 40, and the condensed refrigerant flows through the four-way valve 70 to the first heating mechanism 60, and after being heated by the first heating mechanism 60, flows to the gas-liquid separator 90 for separation, and after separation through the gas-liquid separator 90, flows to the air intake port of the compressor 10, completing the cycle. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 flows to the indoor heat exchanger 20 through the four-way valve 70 for heat release and condensation. The condensed refrigerant is throttled by the second throttling mechanism 80 and flows to the first heating mechanism 60. When the fourth on-off valve 230 is opened and the fifth on-off valve 240 is closed, the refrigerant is heated by the first heating mechanism 60 and then flows back to the gas-liquid separator 90 for separation and flows back to the intake port of the compressor 10 for air replenishment. When the fourth on-off valve 230 is closed and the fifth on-off valve 240 is opened, the refrigerant is heated by the first heating mechanism 60 and then flows directly back to the enthalpy increase port of the compressor 10 for enthalpy increase.

[0108] Alternatively, the first valve port of the four-way valve 70 is connected to the second valve port, the third valve port is connected to the fourth valve port, the first on-off valve 52 is turned on, the first throttling mechanism 30 is turned on, and the second throttling mechanism 80 is turned on.

[0109] The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 flows to the outdoor heat exchanger 40 through the four-way valve 70 in one way, and is defrosted in the outdoor heat exchanger 40. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 flows to the indoor heat exchanger 20 through the four-way valve 70 in another way to release heat and condense. The condensed refrigerant flows to the first heating mechanism 60 after being throttled by the second throttling mechanism 80 in one way, and flows to the outdoor heat exchanger 40 together with the refrigerant flowing out through the bypass mechanism 51 in the other way after being throttled by the first throttling mechanism 30 to be defrosted.

[0110] In cooling mode:

[0111] The second valve port of the four-way valve 70 is connected to the third valve port, the first valve port is connected to the fourth valve port, the first on-off valve 52 is closed, and the first throttling mechanism 30 is connected to the second throttling mechanism 80 .

[0112] The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 flows to the outdoor heat exchanger 40 through the four-way valve 70 to release heat and condense. The refrigerant after release heat and condensation is throttled by the first throttling mechanism 30 and flows all the way to the indoor heat exchanger 20, where it exchanges heat and evaporates. The low-temperature and low-pressure gaseous refrigerant after evaporation flows to the first heating mechanism 60 through the four-way valve 70, flows to the gas-liquid separator 90 for separation after being heated by the first heating mechanism 60, and flows to the suction port of the compressor 10 after separation after passing through the gas-liquid separator 90 to complete the cycle. The refrigerant after heat release and condensation is throttled by the first throttling mechanism 30 and then throttled by the second throttling mechanism 80 to flow to the first heating mechanism 60. When the fourth on-off valve 230 is opened and the fifth on-off valve 240 is closed, the refrigerant is heated by the first heating mechanism 60 and then flows back to the gas-liquid separator 90 for separation and then flows back to the intake port of the compressor 10 for air replenishment. When the fourth on-off valve 230 is closed and the fifth on-off valve 240 is opened, the refrigerant is heated by the first heating mechanism 60 and then flows back directly to the enthalpy increase port of the compressor 10 for enthalpy increase.

[0113] An embodiment of the present invention further provides a control method of an air conditioning system 100, comprising the steps of:

[0114] S110: When the defrosting condition is met, the bypass mechanism 50 is controlled to be turned on, so that the refrigerant discharged from the compressor flows to the indoor heat exchanger 20 in one way and flows to the outdoor heat exchanger 40 in the other way through the bypass mechanism 50, at least part of the refrigerant flowing out of the indoor heat exchanger 20 flows back to the compressor 10 after passing through the first heating mechanism 60, and the refrigerant flowing out of the outdoor heat exchanger 40 flows back to the compressor 10;

[0115] Specifically, when the air conditioning system 100 is normally heated for a preset time, the first throttling mechanism 30 is controlled to be disconnected or turned on, and the bypass mechanism 50 is turned on. It can be understood that in other embodiments, when the system parameter (such as temperature) of the air conditioning system 100 reaches a preset threshold, the first throttling mechanism 30 can be controlled to be turned on or off, and the bypass mechanism 50 can be turned on, which is not limited here.

[0116] When the bypass mechanism 50 is turned on, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 flows to the indoor heat exchanger 20 for heat exchange, and flows to the outdoor heat exchanger 40 through the bypass mechanism 50 for defrosting the outdoor heat exchanger 40. Among them, at least part of the refrigerant after heat exchange with the indoor heat exchanger 20 is heated by the first heating mechanism 60 and then flows back to the compressor 10, and the refrigerant after defrosting the outdoor heat exchanger 40 flows back to the compressor 10. In this way, when the air-conditioning system 100 needs to be defrosted, the indoor space can still be heated, which ensures the continuity of heating, thereby reducing the fluctuation of the indoor temperature during defrosting.

[0117] S120: When the defrosting condition is not met, the bypass mechanism 50 is controlled to be disconnected, and all the refrigerant discharged from the compressor 10 flows to the indoor heat exchanger 20, and at least part of the refrigerant flowing out of the outdoor heat exchanger 20 flows to the outdoor heat exchanger 40 and returns to the compressor 10.

[0118] Specifically, when the first throttling mechanism 30 is turned on and the bypass mechanism 50 is turned off, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 all flows to the indoor heat exchanger 20 to perform normal heating work.

[0119] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0120] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An air conditioning system, characterized in that: It comprises a compressor (10), an indoor heat exchanger (20) and an outdoor heat exchanger (40) which are connected in sequence; A bypass mechanism (50) connected between the outdoor heat exchanger (40) and the exhaust end of the compressor (10); A first heating mechanism (60) is connected between the indoor heat exchanger (20) and the suction end of the compressor (10); In the defrosting and heating mode, the bypass mechanism (50) is turned on, and the refrigerant discharged from the compressor (10) flows to the indoor heat exchanger (20) in one path, and flows to the outdoor heat exchanger (40) in the other path through the bypass mechanism (50), and at least part of the refrigerant flowing out of the indoor heat exchanger (20) flows back to the compressor (10) after passing through the first heating mechanism (60); The air conditioning system further comprises a first throttling mechanism (30), the first throttling mechanism (30) being connected between the indoor heat exchanger (20) and the outdoor heat exchanger (40); one end of the bypass mechanism (50) is connected to the exhaust end of the compressor (10), and the other end is connected between the first throttling mechanism (30) and the outdoor heat exchanger (40) or directly connected to the outdoor heat exchanger (40); in the defrosting heating mode, the bypass mechanism (50) is turned on, and the first throttling mechanism (30) is turned on or off; The first heating mechanism (60) is connected between the outdoor heat exchanger (40) and the suction end of the compressor (10), and the refrigerant flowing out of the outdoor heat exchanger (40) flows back to the compressor (10) after passing through the first heating mechanism (60); The air conditioning system further comprises a third connecting pipe (200) and a fourth connecting pipe (210), one end of the third connecting pipe (200) being connected to the indoor heat exchanger (20) and passing through the first heating mechanism (60), and the other end being connected to the enthalpy increasing port of the compressor (10), and one end of the fourth connecting pipe (210) being connected to the outdoor heat exchanger (40) and passing through the first heating mechanism (60), and the other end being connected to the air intake port of the compressor (10); The air conditioning system further comprises a fifth connecting pipeline (220) and a fourth on-off valve (230), wherein the fifth connecting pipeline (220) is connected between the third connecting pipeline (200) and the fourth connecting pipeline (210), and the fourth on-off valve (230) is mounted on the fifth connecting pipeline (220); Wherein, the connection points of the fifth connecting pipeline (220) with the third connecting pipeline (200) and the fourth connecting pipeline (210) are all located upstream of the liquid inlet end of the first heating mechanism (60).

2. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises a second throttling mechanism (80), one end of the second throttling mechanism (80) being in communication with the indoor heat exchanger (20), and the other end of the second throttling mechanism (80) being in communication with the first heating mechanism (60).

3. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises a fifth on-off valve (240), the fifth on-off valve (240) being mounted on the third connecting pipeline (200) and located between the first heating mechanism (60) and an enthalpy increasing port of the compressor (10).

4. The air conditioning system according to claim 1, characterized in that: The first heating mechanism (60) is an electric heating mechanism.

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