Air conditioning system

Abstract

The utility model relates to an air conditioning system, which belongs to the technical field of air conditioning equipment and comprises an indoor heat exchanger and an outdoor heat exchanger component. The outdoor heat exchanger assembly comprises a heat exchange pipe set and an anti-freezing section, the air conditioning system further comprises a throttling device, the first end of the throttling device is connected with the first end of the anti-freezing section, and the second end of the throttling device is connected with the liquid collecting end of the heat exchange pipe set. The first heating valve is connected between the throttling device and the anti-freezing section in series; the second heating valve is connected between the throttling device and the heat exchange tube group in series; one end of the first refrigerating valve is connected with the liquid collecting end of the heat exchange tube set, and the other end of the first refrigerating valve is connected between the first heating valve and the throttling device; and one end of the second refrigerating valve is connected between the throttling device and the second heating valve, and the other end of the second refrigerating valve is connected between the second end of the anti-freezing section and the indoor heat exchanger. The flow direction of refrigerants in the refrigerating mode and the heating mode of the air conditioner is controlled through on-off of the valve body, the refrigerants flow through the anti-freezing section in the heating mode to achieve the anti-freezing effect, the refrigerants do not flow through the anti-freezing section in the refrigerating mode, and therefore loss of the refrigerating capacity of a unit is reduced.

Description

Technical Field

[0001] This application relates to the field of air conditioning equipment technology, and more particularly to an air conditioning system. Background Technology

[0002] An air conditioning system mainly consists of an outdoor unit and an indoor unit. The outdoor unit typically includes an outdoor casing and a fan, heat exchanger, compressor, and various valves housed within it. The outdoor unit is connected to the indoor unit via piping.

[0003] When ambient temperature and humidity reach certain conditions, frost will form on the air side of the outdoor unit's heat exchanger. However, the airflow distribution on the surface of the outdoor unit's heat exchanger is uneven. During frosting, the airflow velocity at the bottom of the heat exchanger is low, resulting in poor heat exchange efficiency. Consequently, frost forms first and in greater quantities at the bottom of the heat exchanger. Furthermore, defrost water from the top of the heat exchanger tends to accumulate at the bottom, rapidly frosting or even freezing at the start of the next heating cycle. This leads to reduced heat exchange capacity and problems such as compressor liquid slugging. Currently, electric heating is generally used to achieve antifreeze protection at the bottom of the heat exchanger, or, as shown in the attached... Figure 1 As shown, an anti-freeze section is set at the bottom of the heat exchanger. By allowing the refrigerant with a higher temperature flowing out of the room to pass through the anti-freeze section at the bottom of the heat exchanger, the effect of preventing frost from forming at the bottom of the heat exchanger is achieved during heating.

[0004] However, this design is only applicable to air conditioning systems with throttling devices on the indoor side. For air conditioning systems without throttling devices on the indoor side, the refrigerant entering the antifreeze section during cooling is a two-phase refrigerant after throttling. Under the external ambient temperature conditions during cooling operation, it will undergo intense heat exchange, resulting in a loss of the unit's cooling capacity and a reduction in the unit's cooling efficiency. Utility Model Content

[0005] This utility model solves, to at least a certain extent, one of the technical problems in the related art.

[0006] Therefore, this application aims to provide an air conditioning system that, by setting multiple valves, controls the flow of refrigerant in the air conditioning cooling and heating modes by opening and closing the valves, so that the refrigerant in the heating mode enters the anti-freezing section, while the refrigerant in the cooling mode does not flow through the anti-freezing section, thereby reducing the loss of the unit's cooling capacity.

[0007] To achieve the above objectives, this utility model provides an air conditioning system, comprising: an indoor heat exchanger, a four-way valve, and an outdoor heat exchanger assembly;

[0008] The outdoor heat exchanger assembly includes: a heat exchange tube assembly, the gas collection end of which is connected to a four-way valve; and an anti-freeze section connected to the bottom of the heat exchange tube assembly, the two ends of which are the first end and the second end of the anti-freeze section, and the second end of the anti-freeze section is connected to the indoor heat exchanger.

[0009] The air conditioning system also includes: a throttling device for reducing the pressure of the refrigerant; the first end of the throttling device is connected to the first end of the antifreeze section, and the second end of the throttling device is connected to the liquid collection end of the heat exchange tube assembly;

[0010] The first heating valve is connected in series between the first end of the antifreeze section and the first end of the throttling device;

[0011] The second heating valve is connected in series between the second end of the throttling device and the liquid collection end of the heat exchange tube assembly;

[0012] The first refrigeration valve has one end connected to the liquid collection end of the heat exchange tube assembly, and the other end connected between the first heating valve and the throttling device.

[0013] The second refrigeration valve has one end connected between the throttling device and the second heating valve, and the other end connected between the second end of the antifreeze section and the indoor heat exchanger.

[0014] When the air conditioning system is in heating mode, the first heating valve and the second heating valve are open, while the first cooling valve and the second cooling valve are closed, allowing the refrigerant to flow from the indoor heat exchanger through the antifreeze section, the first heating valve, the throttling device, and the second heating valve to the heat exchange tube assembly.

[0015] When the air conditioning system is cooling, the first and second refrigeration valves are open, while the first and second heating valves are closed, allowing the refrigerant to flow from the liquid collection end of the heat exchanger tube assembly through the first refrigeration valve, the throttling device, and the second refrigeration valve to the indoor heat exchanger.

[0016] In the technical solution, multiple valves are set up to control the flow of refrigerant in the air conditioning cooling and heating modes by opening and closing the valves. In the heating mode, the refrigerant enters the anti-freeze section to ensure that the anti-freeze section will not frost up. In the cooling mode, the refrigerant flows directly into the indoor heat exchanger through the heat exchange tube group and the throttling device. The refrigerant is only charged into the anti-freeze section at the beginning. During the process, the refrigerant in the anti-freeze section will not flow, thereby reducing the loss of the unit's cooling capacity.

[0017] In some embodiments, a first heating branch is connected between a first end of the antifreeze section and a first end of the throttling device; a second heating branch is connected between a second end of the throttling device and a liquid collecting end of the heat exchange tube assembly; a first cooling branch has a first end connected to the liquid collecting end of the heat exchange tube assembly, and a second end of the first cooling branch is connected to the first heating branch; a second cooling branch has a first end connected to the second heating branch, and a second end of the second cooling branch is connected between a second end of the antifreeze section and an indoor heat exchanger; a first heating valve is connected to the first heating branch and connected in series between the first end of the antifreeze section and the second end of the first cooling branch, for disconnecting or connecting the first heating branch; a second heating valve is connected to the second heating branch and connected in series between the first end of the second cooling branch and the liquid collecting end of the heat exchange tube assembly, for disconnecting or connecting the second heating branch; a first cooling valve is connected to the first cooling branch, for disconnecting or connecting the first cooling branch; and a second cooling valve is connected to the second cooling branch, for disconnecting or connecting the second cooling branch.

[0018] When the air conditioning system is in heating mode, the first heating valve and the second heating valve are open, while the first cooling valve and the second cooling valve are closed, allowing the refrigerant to flow from the indoor heat exchanger through the antifreeze section, the first heat exchange branch, the throttling device, and the second heating branch to the heat exchange tube assembly.

[0019] When the air conditioning system is cooling, the first and second refrigeration valves are open, while the first and second heating valves are closed, allowing the refrigerant to flow from the liquid collection end of the heat exchanger tube assembly through the first refrigeration branch, the throttling device, and the second refrigeration branch to the indoor heat exchanger.

[0020] In the technical solution, multiple branches and valve bodies are set up. The opening and closing of the branches are realized through the valve bodies. The flow of refrigerant in the air conditioning cooling mode and heating mode is controlled by opening and closing the branches.

[0021] In some embodiments, the first heating valve is a one-way valve, and the inlet end of the first heating valve in the conducting state is connected to the first end of the antifreeze section.

[0022] In the technical solution, the first heating valve uses a one-way valve that can achieve autonomous one-way shut-off through the refrigerant pressure difference on both sides of the valve body. The side of the first heating valve connected to the first end of the antifreeze section is the valve front, and the other side is the valve back. When the air conditioner is heating, the first heating valve is open; when the air conditioner is cooling, the refrigerant in front of the valve is low-pressure refrigerant that has been reduced by the throttling device, while the refrigerant behind the valve is still high-pressure refrigerant that has not been reduced by the throttling device. This makes the pressure in front of the valve less than the pressure behind the valve by a certain value, and the first heating valve is stably closed. This makes the shut-off function of the first heating valve more reliable and less expensive when the air conditioner is cooling.

[0023] In some embodiments, the second heating valve is a one-way valve, and the outlet end of the second heating valve in the conducting state is connected to the liquid collection end of the heat exchange tube assembly.

[0024] In the technical solution, the second heating valve uses a one-way valve that can achieve autonomous one-way shut-off through the refrigerant pressure difference on both sides of the valve body. The side of the second heating valve connected to the second end of the throttling device is the valve front, and the other side is the valve back. When the air conditioner is heating, the second heating valve is open; when the air conditioner is cooling, the refrigerant in front of the second heating valve is low-pressure refrigerant that has been reduced by the throttling device, while the refrigerant behind the valve is still high-pressure refrigerant that has not been reduced by the throttling device. This makes the pressure in front of the valve less than the pressure behind the valve by a certain value, and the second heating valve is stably closed. This makes the shut-off function of the second heating valve more reliable and less costly when the air conditioner is cooling.

[0025] In some embodiments, the first refrigeration valve is a one-way valve, and the inlet end of the first refrigeration valve in the conducting state is connected to the liquid collection end of the heat exchange tube assembly.

[0026] In the technical solution, the first refrigeration valve uses a one-way valve that can achieve autonomous one-way shut-off through the refrigerant pressure difference on both sides of the valve body. The side of the first refrigeration valve connected to the liquid collection end of the heat exchange tube group is the valve front and the other side is the valve back. When the air conditioner is heating, the refrigerant in front of the valve is low-pressure refrigerant that has been reduced by the throttling device, while the refrigerant behind the valve is still high-pressure refrigerant that has not been reduced by the throttling device. This makes the pressure in front of the valve less than the pressure behind the valve, so that the first refrigeration valve closes stably. This makes the shut-off function of the first refrigeration valve more reliable and less expensive when the air conditioner system is heating.

[0027] In some embodiments, the second refrigeration valve is a one-way valve; the inlet end of the second refrigeration valve in the open state is connected to a throttling device.

[0028] In the technical solution, the second refrigeration valve uses a one-way valve that can achieve autonomous one-way shut-off through the refrigerant pressure difference on both sides of the valve body. The side of the second refrigeration valve connected to the throttling device is the valve front and the other side is the valve back. When the air conditioner is heating, the refrigerant in front of the valve is low-pressure refrigerant that has been reduced by the throttling device, while the refrigerant behind the valve is still high-pressure refrigerant that has not been reduced by the throttling device. This makes the pressure in front of the valve less than the pressure behind the valve by a certain value, so that the second refrigeration valve closes stably. This makes the shut-off function of the second refrigeration valve more reliable and less expensive when the air conditioner system is heating.

[0029] In some embodiments, the first end of the antifreeze section and the second end of the antifreeze section are located on the same side of the outdoor heat exchanger assembly.

[0030] In some embodiments, the outdoor heat exchanger assembly includes: a distributor whose outlet is connected to the liquid collection end of the heat exchange tube assembly via a plurality of capillaries, the confluence of the distributor being connected to the second end of the second heating branch, and the confluence of the distributor being connected to the first end of the first cooling branch.

[0031] In some embodiments, the first end of the indoor heat exchanger is connected to the second end of the antifreeze section, and the second end of the indoor heat exchanger is connected to the four-way valve.

[0032] In the technical solution, the switching between cooling and heating modes of the air conditioning system can be achieved by switching the four-way valve. In cooling mode, the refrigerant flows from the four-way valve to the heat exchange tube assembly, is depressurized by the throttling device, and then flows to the indoor heat exchanger to absorb heat. In heating mode, the refrigerant flows in the opposite direction, flowing from the four-way valve to the indoor heat exchanger to release heat, and then passes through the anti-freeze section and the throttling device before entering the heat exchange tube assembly.

[0033] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0034] Figure 1 It is based on a schematic diagram of the air conditioning system's circulation system during heating, as described in relevant technologies;

[0035] Figure 2 It is based on a schematic diagram of the air conditioning system's circulation system during cooling in relevant technologies;

[0036] Figure 3 This is a schematic diagram of the circulation system of an air conditioning system during heating, according to some embodiments;

[0037] Figure 4 This is a schematic diagram of the air conditioning system during cooling, according to some embodiments;

[0038] Figure 5 This is a schematic diagram of the circulation system of an air conditioning system according to some other embodiments;

[0039] Figure 6 This is a schematic diagram of the circulation system of an air conditioning system according to some other embodiments;

[0040] Figure 7 and Figure 8 This is a schematic diagram of the circulation system of an air conditioning system according to some other embodiments;

[0041] Figure 9 This is a schematic diagram of the circulation system of an air conditioning system in heating mode according to some embodiments;

[0042] Figure 10 This is a schematic diagram of the air conditioning system during cooling, according to some other embodiments.

[0043] In the above figures: 100, indoor heat exchanger; 200, compressor; 300, heat exchange tube assembly; 310, gas collecting end; 320, liquid collecting end; 400, four-way valve; 500, anti-freeze section; 610, throttling device; 620, first refrigeration valve; 630, second refrigeration valve; 640, first heating valve; 650, second heating valve; 660, first heating branch; 670, second heating branch; 680, first refrigeration branch; 690, second refrigeration branch; 700, distributor; 900, capillary tube. Detailed Implementation

[0044] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0048] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0049] In this application, the air conditioning system mainly includes an outdoor unit and an indoor unit. The outdoor unit typically includes an outdoor unit casing and an outdoor fan, an outdoor heat exchanger, and a compressor housed within the casing. The indoor unit typically includes an indoor unit casing and an indoor fan and an indoor heat exchanger housed within the casing. The outdoor unit is connected to the indoor unit via liquid and gas pipelines.

[0050] In the following, embodiments of this application will be described in detail with reference to the accompanying drawings.

[0051] Reference Figures 1 to 10 As shown in the diagram, the arrows indicate the refrigerant flow direction. The air conditioning system includes a compressor 200. The compressor 200 has an intake port and an exhaust port. The refrigerant in the air conditioning system enters the compressor 200 through the intake port and is discharged through the exhaust port to the indoor heat exchanger 100 or the outdoor heat exchanger.

[0052] In some embodiments, the air conditioning system further includes a four-way valve 400. The four-way valve 400 has four ports, and when the air conditioning switches between heating and cooling modes, the positions of its two connected sets of ports are switched to reverse the flow of refrigerant.

[0053] In some embodiments, the air conditioning system further includes an outdoor heat exchanger assembly. The outdoor heat exchanger assembly has a heat exchange tube assembly 300 for exchanging heat with outdoor air. The heat exchange tube assembly 300 includes a gas collecting end 310 and a liquid collecting end 320, and the gas collecting end 310 of the heat exchange tube assembly 300 is connected to a four-way valve 400.

[0054] In some embodiments, the outdoor heat exchanger assembly further includes an antifreeze section 500. The antifreeze section 500 is connected to the bottom of the heat exchange tube assembly 300.

[0055] The two ends of the antifreeze section 500 are the first end and the second end of the antifreeze section 500, respectively. The second end of the antifreeze section 500 is connected to the indoor heat exchanger 100. The first end of the antifreeze section 500 is connected to the liquid collection end 320 of the heat exchange tube assembly 300.

[0056] In some embodiments, the air conditioning system further includes a throttling device 610. The throttling device 610 is used to reduce the pressure of the refrigerant, throttling the high-pressure refrigerant flowing through it into low-pressure refrigerant.

[0057] In some embodiments, the throttling device 610 can be a throttling capillary tube or an electronic expansion valve. The throttling device 610, designed as a capillary tube, limits the speed at which the refrigerant flows through the pipe, thereby regulating the refrigerant pressure and throttling high-pressure refrigerant into low-pressure refrigerant. It is low-cost and simple in structure. The throttling device 610, designed as an electronic expansion valve, controls the flow rate through an electromagnet and a regulating valve core to throttle high-pressure refrigerant into low-pressure refrigerant. It can adjust rapidly in real time, making the system more stable and reliable.

[0058] Reference Figure 1 and Figure 2 The discharge port of compressor 200 is connected to the D pipe of four-way valve 400, the C pipe of four-way valve 400 is connected to the gas collecting end 310 of heat exchange tube assembly 300, the liquid collecting end 320 of heat exchange tube assembly 300 is connected in series with throttling device 610 to the first end of antifreeze section 500, the second end of antifreeze section 500 is connected to the first end of indoor heat exchanger 100; the S pipe of four-way valve 400 is connected to the suction port of compressor 200; the E pipe of four-way valve 400 is connected to the second end of indoor heat exchanger 100.

[0059] When heating, refer to Figure 1 The high-temperature, high-pressure refrigerant discharged from compressor 200 flows to indoor heat exchanger 100 after passing through four-way valve 400. In indoor heat exchanger 100, the refrigerant is cooled to a high-pressure, medium-temperature liquid refrigerant. At this point, the refrigerant temperature is still relatively high, and it enters antifreeze section 500. After exiting antifreeze section 500, the refrigerant enters throttling device 610, where it is throttled into a low-temperature, low-pressure two-phase refrigerant. The refrigerant then enters heat exchange tube assembly 300 and evaporates into a low-temperature, low-pressure gaseous state. The evaporated refrigerant then passes through four-way valve 400 and enters compressor 200 for compression.

[0060] During heating operation, the refrigerant in the antifreeze section 500 is the refrigerant before throttling, which can keep the bottom of the outdoor heat exchanger assembly at a high temperature. Even when the outdoor heat exchanger assembly is frosted, the antifreeze section 500 can still remain frost-free.

[0061] When cooling, refer to Figure 2The high-temperature and high-pressure refrigerant discharged from the compressor 200 flows into the heat exchange tube assembly 300 through the four-way valve 400. After flowing out from the liquid collection end 320 of the heat exchange tube assembly 300, it reaches the throttling device 610, and then flows to the indoor heat exchanger 100 through the antifreeze section 500. It continues to pass through the four-way valve 400 and returns to the compressor 200.

[0062] During the refrigeration process, the refrigerant entering the antifreeze section 500 is a two-phase refrigerant after throttling. Under the external ambient temperature conditions of the refrigeration operation, it will undergo intense heat exchange, resulting in a loss of the unit's refrigeration capacity and a reduction in the unit's refrigeration efficiency.

[0063] In order to enable the air conditioning system with a throttling device 610 only on the outdoor side to achieve the effect of preventing frost and freezing at the bottom of the outdoor heat exchanger assembly during heating and minimizing losses during cooling, in some embodiments, refer to Figure 3 and Figure 4 The first end of the antifreeze section 500 is connected to the throttling device 610 through the first one-way valve 10, and the second end of the antifreeze section 500 is connected to the throttling device 610 through the second one-way valve 20.

[0064] The first one-way valve 10 is connected to the first end of the antifreeze section 500 at its inlet end in the open state.

[0065] The second check valve 20 is connected to the throttling device 610 at its inlet end when it is in the open state.

[0066] When heating, refer to Figure 3 The high-temperature, high-pressure refrigerant discharged from compressor 200 flows to indoor heat exchanger 100 after passing through four-way valve 400. In indoor heat exchanger 100, the refrigerant is cooled to a high-pressure, medium-temperature liquid refrigerant. At this point, the refrigerant temperature is still relatively high. Due to the reverse shut-off effect of second one-way valve 20, the refrigerant enters antifreeze section 500. After exiting antifreeze section 500, the refrigerant passes through first one-way valve 10 and enters throttling device 610, where it is throttled into a low-temperature, low-pressure two-phase refrigerant. The refrigerant then enters heat exchange tube assembly 300 and evaporates into a low-temperature, low-pressure gaseous state. The evaporated refrigerant then passes through four-way valve 400 and enters compressor 200 for compression.

[0067] During heating operation, the refrigerant in the antifreeze section 500 is the refrigerant before throttling, which can keep the bottom of the outdoor heat exchanger assembly at a high temperature. Even when the outdoor heat exchanger assembly is frosted, the antifreeze section 500 can still remain frost-free.

[0068] When cooling, refer to Figure 4The high-temperature, high-pressure refrigerant discharged from the compressor 200 flows to the heat exchange tube assembly 300 after passing through the four-way valve 400. In the heat exchange tube assembly 300, the refrigerant is cooled into a high-pressure, medium-temperature liquid refrigerant and enters the throttling device 610, where it is throttled into a low-temperature, low-pressure two-phase refrigerant. Due to the reverse shut-off effect of the first one-way valve 10, the refrigerant passes through the second one-way valve 20 and directly enters the indoor heat exchanger 100, where it evaporates into a low-temperature, low-pressure gaseous state. The evaporated refrigerant then passes through the four-way valve 400 and enters the compressor 200 for compression.

[0069] During cooling operation, although a certain amount of throttled refrigerant is introduced into the antifreeze section 500 at the beginning of the cycle, it does not flow and will quickly evaporate into saturated gas corresponding to the ambient temperature under the higher outdoor ambient temperature, so there will be no significant energy loss.

[0070] In the above embodiment, during refrigeration operation, both the refrigerant before and after the first one-way valve 10 is at low pressure after throttling, resulting in a small pressure difference. However, according to the structural design of the one-way valve, a sufficient pressure difference is required for reliable reverse shut-off; the smaller the pressure difference, the greater the reverse leakage. Therefore, in actual operation, the first one-way valve 10 cannot completely shut off the refrigerant passing through the throttling device 610, causing some refrigerant to enter the anti-freeze section 500 through the first one-way valve 10. Since the ambient temperature is often high during refrigeration operation, this bypassed refrigerant will evaporate violently and absorb heat. Although the bypass flow rate is small, a certain loss in refrigeration capacity still occurs.

[0071] To prevent the aforementioned problems, in some embodiments, the check valve is replaced with other devices that have a shut-off effect, such as a solenoid valve or an electronic expansion valve.

[0072] Reference Figure 5 ,and Figure 4 The difference is that the first check valve 10 is replaced with the first solenoid valve 30, and the second check valve 20 is replaced with the second solenoid valve 40.

[0073] When heating, the second solenoid valve 40 is closed and the first solenoid valve 30 is opened, and the refrigerant passes through the antifreeze section 500 to prevent frost and ice formation.

[0074] During cooling, the second solenoid valve 40 opens and the first solenoid valve 30 closes, preventing the refrigerant from passing through the antifreeze section 500 and thus avoiding loss of cooling capacity.

[0075] In some embodiments, refer to Figure 6The air conditioning system includes an electric three-way valve 50. The first end of the indoor heat exchanger 100 is connected to port A of the electric three-way valve 50, port B of the electric three-way valve 50 is connected to the second end of the antifreeze section 500, port C of the electric three-way valve 50 is connected to the throttling device 610, and the first end of the antifreeze section 500 is connected between port C of the electric three-way valve 50 and the throttling device 610.

[0076] When heating, ports A and B of the electric three-way valve 50 are connected, while ports A and C are disconnected. The refrigerant passes through the antifreeze section 500 to prevent frost and ice formation.

[0077] During cooling, ports A and B of the electric three-way valve 50 are disconnected, while ports A and C are connected. Although a certain amount of throttled refrigerant is charged into the antifreeze section 500 at the beginning of the cycle, it does not flow and therefore does not result in significant capacity loss.

[0078] In some embodiments, refer to Figure 7 The air conditioning system includes a first heating valve 640. The first heating valve 640 is connected in series between the first end of the antifreeze section 500 and the first end of the throttling device 610.

[0079] The air conditioning system includes a second heating valve 650. The second heating valve 650 is connected in series between the second end of the throttling device 610 and the liquid collection end of the heat exchange tube assembly 300.

[0080] The air conditioning system includes a first refrigeration valve 620. One end of the first refrigeration valve 620 is connected to the liquid collection end of the heat exchange tube assembly 300, and the other end of the first refrigeration valve 620 is connected between the first end of the throttling device 610 and the first heating valve 640.

[0081] The air conditioning system includes a second refrigeration valve 630. One end of the second refrigeration valve 630 is connected between the second heating valve 650 and the second end of the throttling device 610, and the other end of the second refrigeration valve 630 is connected between the second end of the antifreeze section 500 and the indoor heat exchanger 100.

[0082] When heating, refer to Figure 9 The first heating valve 640 and the second heating valve 650 are turned on, while the first cooling valve 620 and the second cooling valve 630 are turned off, so that the refrigerant flows from the indoor heat exchanger 100 through the antifreeze section 500, the first heating valve 640, the throttling device 610, and the second heating valve 650 to the heat exchange tube group 300.

[0083] When cooling, refer to Figure 10 The first refrigeration valve 620 and the second refrigeration valve 630 are turned on, while the first heating valve 640 and the second heating valve 650 are turned off, so that the refrigerant flows from the liquid collection end of the heat exchange tube group 300 through the first refrigeration valve 620, the throttling device 610 and the second refrigeration valve 630 to the indoor heat exchanger 100.

[0084] In the above scheme, multiple valve bodies are set, including a first heating valve 640, a second heating valve 650, a first cooling valve 620, and a second cooling valve 630. The flow of refrigerant in the air conditioning cooling and heating modes is controlled by opening and closing the valve bodies. In the heating mode, the refrigerant with a higher temperature flowing out of the indoor heat exchanger 100 enters the anti-freeze section 500 to prevent frost and ice from forming on the bottom of the outdoor heat exchanger assembly. In the cooling mode, the refrigerant flowing out of the heat exchange tube group 300 flows directly into the indoor heat exchanger 100 after being throttled by the throttling device 610. The refrigerant does not flow through the anti-freeze section 500, thereby reducing the loss of the unit's cooling capacity.

[0085] In some embodiments, refer to Figure 8 The air conditioning system includes a first heating branch 660. The first heating branch 660 is connected between the first end of the antifreeze section 500 and the first end of the throttling device 610.

[0086] The air conditioning system includes a second heating branch 670. The second heating branch 670 is connected between the second end of the throttling device 610 and the liquid collection end 320 of the heat exchange tube assembly 300.

[0087] The air conditioning system includes a first refrigeration branch 680. The first end of the first refrigeration branch 680 is connected to the liquid collection end 320 of the heat exchange tube assembly 300, and the second end of the first refrigeration branch 680 is connected to the first heating branch 660.

[0088] The air conditioning system includes a second cooling branch 690. The first end of the second cooling branch 690 is connected to the second heating branch 670, and the second end of the second cooling branch 690 is connected between the second end of the antifreeze section 500 and the indoor heat exchanger 100.

[0089] Combination Figure 7 The first heating valve 640 is connected to the first heating branch 660 and is connected in series between the first end of the antifreeze section 500 and the second end of the first cooling branch 680, so as to disconnect or connect the first heating branch 660.

[0090] The second heating valve 650 is connected to the second heating branch 670 and is connected in series between the first end of the second cooling branch 690 and the liquid collection end 320 of the heat exchange tube assembly 300, so as to disconnect or connect the second heating branch 670.

[0091] The first refrigeration valve 620 is connected to the first refrigeration branch 680 and is used to disconnect or connect the first refrigeration branch 680.

[0092] The second refrigeration valve 630 is connected to the second refrigeration branch 690 and is used to disconnect or connect the second refrigeration branch 690.

[0093] When the air conditioning system is in heating mode, the first heating valve 640 and the second heating valve 650 are turned on, while the first cooling valve 620 and the second cooling valve 630 are turned off, so that the refrigerant flows from the indoor heat exchanger 100 through the antifreeze section 500, the first heating branch 660, the throttling device 610, and the second heating branch 670 to the heat exchange tube group 300.

[0094] When the air conditioning system is cooling, the first cooling valve 620 and the second cooling valve 630 are turned on, while the first heating valve 640 and the second heating valve 650 are turned off, so that the refrigerant flows from the liquid collection end 320 of the heat exchange tube group 300 through the first cooling branch 680, the throttling device 610, and the second cooling branch 690 to the indoor heat exchanger 100.

[0095] In the above embodiment, four sets of branches and valve bodies are provided. The opening and closing of the branches are realized through the valve bodies. The opening and closing of the branches controls the flow of refrigerant in the air conditioning cooling mode and heating mode. In the heating mode, the refrigerant with a higher temperature flowing out of the indoor heat exchanger 100 enters the anti-freezing section 500 to prevent frost and ice from forming on the bottom of the outdoor heat exchanger assembly. In the cooling mode, the refrigerant flowing out of the heat exchange tube group 300 is throttled by the throttling device 610 and flows directly into the indoor heat exchanger 100. The refrigerant does not flow through the anti-freezing section 500, thereby reducing the loss of the unit's cooling capacity.

[0096] In some embodiments, the first heating valve 640 is a one-way valve, and the inlet end of the first heating valve 640 in the open state is connected to the first end of the antifreeze section 500. The inlet end of the first heating valve 640 that connects to the first end of the antifreeze section 500 is the valve inlet, and the outlet end of the first heating valve 640 is the valve outlet.

[0097] When the air conditioner is in heating mode, the first heating valve 640 is open. When the air conditioner is in cooling mode, the refrigerant before the first heating valve 640 is low-pressure refrigerant that has been reduced by the throttling device 610, while the refrigerant after the valve is still high-pressure refrigerant that has not passed through the throttling device 610. This makes the pressure before the valve lower than the pressure after the valve by a certain value, and the first heating valve 640 is stably closed. This makes the shut-off function of the first heating valve 640 more reliable and less costly when the air conditioner is in cooling mode.

[0098] In some embodiments, the second heating valve 650 is a one-way valve, and its outlet end in the conducting state is connected to the liquid collection end 320 of the heat exchange tube assembly 300. The side of the second heating valve 650 that is connected to the first end of the second refrigeration branch 690 is the valve inlet, and the outlet end on the other side is the valve outlet.

[0099] When the air conditioner is in heating mode, the second heating valve 650 is open. When the air conditioner is in cooling mode, the refrigerant before the second heating valve 650 is low-pressure refrigerant that has been reduced by the throttling device 610, while the refrigerant after the valve is still high-pressure refrigerant that has not passed through the throttling device 610. This makes the pressure before the valve lower than the pressure after the valve by a certain value, and the second heating valve 650 is stably closed. This makes the shut-off function of the second heating valve 650 more reliable and less costly when the air conditioning system is cooling.

[0100] In some embodiments, the first refrigeration valve 620 is a one-way valve, and its inlet end in the conducting state is connected to the liquid collection end 320 of the heat exchange tube assembly 300. The side of the first refrigeration valve 620 connected to the liquid collection end 320 of the heat exchange tube assembly 300 is the valve front side, and the other side is the valve rear side.

[0101] When the air conditioner is cooling, the first refrigerant valve 620 is open. When the air conditioner is heating, the refrigerant before the first refrigerant valve 620 is low-pressure refrigerant that has been reduced by the throttling device 610, while the refrigerant after the valve is still high-pressure refrigerant that has not passed through the throttling device 610. This makes the pressure before the valve less than the pressure after the valve, and the first refrigerant valve 620 is stably closed. This makes the shut-off function of the first refrigerant valve 620 more reliable and less costly when the air conditioner system is heating.

[0102] In some embodiments, the second refrigeration valve 630 is a one-way valve; the inlet end of the second refrigeration valve 630 in the open state is connected to the second end of the throttling device 610. The side of the second refrigeration valve 630 connected to the throttling device 610 is the valve inlet, and the other side is the valve outlet.

[0103] When the air conditioner is cooling, the second refrigerant valve 630 is open. When the air conditioner is heating, the refrigerant before the valve 630 is low-pressure refrigerant that has been reduced by the throttling device 610, while the refrigerant after the valve is still high-pressure refrigerant that has not passed through the throttling device 610. This makes the pressure before the valve lower than the pressure after the valve by a certain value, and the second refrigerant valve 630 is stably closed. This makes the shut-off function of the second refrigerant valve 630 more reliable and less costly when the air conditioner system is heating.

[0104] In some embodiments, the first end of the antifreeze section 500 and the second end of the antifreeze section 500 are located on the same side of the outdoor heat exchanger assembly.

[0105] In some embodiments, the outdoor heat exchanger assembly includes a distributor 700. The distributor 700 has its branch port connected to the liquid collection end 320 of the heat exchange tube assembly 300 via a plurality of capillary tubes 900, the distributor 700 has its confluence port connected to the second end of the second heating branch 670, and the distributor 700 has its confluence port connected to the first end of the first cooling branch 680.

[0106] As described above, the air conditioning system, by setting valve bodies such as the first refrigeration valve 620, the second refrigeration valve 630, the first heating valve 640, and the second heating valve 650, controls the flow of refrigerant in the air conditioning cooling and heating modes by opening and closing the valve bodies. In the heating mode, the refrigerant flows through the anti-freeze section 500 to prevent frost and ice formation; in the cooling mode, the refrigerant flows directly into the indoor heat exchanger 100 after passing through the throttling device 610, without flowing through the anti-freeze section 500, thereby reducing the loss of the unit's cooling capacity.

[0107] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An air conditioning system, characterized in that, include: Indoor heat exchanger, four-way valve; Outdoor heat exchanger assembly, the outdoor heat exchanger assembly comprising: A heat exchanger tube assembly, wherein the gas collecting end of the heat exchanger tube assembly is connected to the four-way valve; An antifreeze section is connected to the bottom of the heat exchange tube assembly. The two ends of the antifreeze section are the first end and the second end of the antifreeze section, respectively. The second end of the antifreeze section is connected to the indoor heat exchanger. A throttling device, wherein the first end of the throttling device is connected to the first end of the antifreeze section, and the second end of the throttling device is connected to the liquid collection end of the heat exchange tube assembly; A first heating valve is connected in series between the first end of the antifreeze section and the first end of the throttling device; The second heating valve is connected in series between the second end of the throttling device and the liquid collection end of the heat exchange tube assembly; The first refrigeration valve has one end connected to the liquid collection end of the heat exchange tube assembly, and the other end connected between the throttling device and the first heating valve. The second refrigeration valve has one end connected between the throttling device and the second heating valve, and the other end connected between the second end of the antifreeze section and the indoor heat exchanger. When the air conditioning system is in heating mode, the first heating valve and the second heating valve are turned on, and the first cooling valve and the second cooling valve are turned off, so that the refrigerant flows from the indoor heat exchanger through the antifreeze section, the first heating valve, the throttling device, and the second heating valve to the heat exchange tube assembly. When the air conditioning system is cooling, the first refrigeration valve and the second refrigeration valve are turned on, and the first heating valve and the second heating valve are turned off, so that the refrigerant flows from the liquid collection end of the heat exchange tube group through the first refrigeration valve, the throttling device, and the second refrigeration valve to the indoor heat exchanger.

2. The air conditioning system according to claim 1, characterized in that, The first heating valve is a one-way valve, and the inlet end of the first heating valve in the conducting state is connected to the first end of the antifreeze section.

3. The air conditioning system according to claim 1, characterized in that, The second heating valve is a one-way valve, and its outlet end in the conducting state is connected to the liquid collection end of the heat exchange tube assembly.

4. The air conditioning system according to claim 1, characterized in that, The first refrigeration valve is a one-way valve, and its inlet end in the conducting state is connected to the liquid collection end of the heat exchange tube assembly.

5. The air conditioning system according to claim 1, characterized in that, The second refrigeration valve is a one-way valve; the inlet end of the second refrigeration valve in the open state is connected to the throttling device.

6. The air conditioning system according to claim 1, characterized in that, The first heating valve, the second heating valve, the first cooling valve, and the second cooling valve are one-way valves.

7. The air conditioning system according to claim 1, characterized in that, The first end and the second end of the antifreeze section are located on the same side of the outdoor heat exchanger assembly.

8. The air conditioning system according to claim 1, characterized in that, The first end of the indoor heat exchanger is connected to the second end of the antifreeze section, and the second end of the indoor heat exchanger is connected to the four-way valve.

9. An air conditioning system, characterized in that, include: Indoor heat exchanger, four-way valve, throttling device; Outdoor heat exchanger assembly, the outdoor heat exchanger assembly comprising: A heat exchanger tube assembly, wherein the gas collecting end of the heat exchanger tube assembly is connected to the four-way valve; An antifreeze section is connected to the bottom of the heat exchange tube assembly. The two ends of the antifreeze section are the first end and the second end of the antifreeze section, respectively. The second end of the antifreeze section is connected to the indoor heat exchanger. The first heating branch is connected between the first end of the antifreeze section and the first end of the throttling device; The second heating branch is connected between the second end of the throttling device and the liquid collection end of the heat exchange tube group; The first refrigeration branch has its first end connected to the liquid collection end of the heat exchange tube assembly, and its second end is connected to the first heating branch. The second refrigeration branch has its first end connected to the second heating branch, and the second end of the second refrigeration branch is connected between the second end of the antifreeze section and the indoor heat exchanger. A first heating valve is connected to the first heating branch and in series between the first end of the antifreeze section and the second end of the first cooling branch, for the purpose of disconnecting or connecting the first heating branch. The second heating valve is connected to the second heating branch and connected in series between the first end of the second cooling branch and the liquid collection end of the heat exchange tube assembly, for the purpose of disconnecting or connecting the second heating branch. A first refrigeration valve is connected to the first refrigeration branch and is used to disconnect or connect the first refrigeration branch. The second refrigeration valve is connected to the second refrigeration branch and is used to disconnect or connect the second refrigeration branch. When the air conditioning system is in heating mode, the first heating valve and the second heating valve are turned on, and the first cooling valve and the second cooling valve are turned off, so that the refrigerant flows from the indoor heat exchanger through the antifreeze section, the first heating branch, the throttling device, and the second heating branch to the heat exchange tube assembly. When the air conditioning system is cooling, the first refrigeration valve and the second refrigeration valve are turned on, and the first heating valve and the second heating valve are turned off, so that the refrigerant flows from the liquid collection end of the heat exchange tube group through the first refrigeration branch, the throttling device, and the second refrigeration branch to the indoor heat exchanger.

10. The air conditioning system according to claim 9, characterized in that, The outdoor heat exchanger assembly includes: The distributor has its branch port connected to the liquid collection end of the heat exchange tube assembly through multiple capillary tubes. The confluence port of the distributor is connected to the second end of the second heating branch, and the confluence port of the distributor is connected to the first end of the first cooling branch.

Images