Air conditioning system

Abstract

The utility model discloses an air conditioning system which comprises a refrigerant circulation system and a water circulation system, and the water circulation system comprises an outdoor side loop part and an indoor side loop part; the air conditioner further comprises a water drainage pipeline communicated with the outdoor side loop part, a first temperature control valve is arranged on the water drainage pipeline in a series connection mode, and when the temperature of circulating water in the outdoor side loop part is lower than a first preset temperature, the first temperature control valve is opened. The water drainage pipeline is additionally arranged on the outdoor side loop part of the water circulation system, and the first temperature control valve is arranged on the water drainage pipeline. The first temperature control valve can switch the opening state and the closing state by detecting the temperature of the medium without being driven by electric energy. When the temperature of the circulating water in the outdoor side loop part is lower than the first preset temperature, the first temperature control valve is automatically opened, and the circulating water in the water circulation system can be discharged through the drainage pipeline, so that the problem of pipeline freezing caused by the fact that the temperature is reduced to 0 DEG C or below can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and more particularly to an air conditioning system. BACKGROUND

[0002] Traditional air conditioning systems rely on the evaporation and condensation processes of refrigerants to transfer heat, achieving refrigeration and heating functions, which requires the refrigerant circulation pipeline to extend to the user end. However, this design results in low integration of the entire machine, large refrigerant charge, and potential safety hazards.

[0003] There is also a fluorine non-in-home air conditioner in the prior art. This type of air conditioner has both the evaporator and the condenser of the refrigerant circulation system arranged on the outdoor unit side, and the refrigerant circulation pipeline does not need to extend to the user end. The heat exchanger at the user end exchanges heat with the refrigerant through circulating water to transfer cold or heat to the user end. This design significantly improves the integration and operational safety of the air conditioning system. Meanwhile, the specific heat capacity of the circulating water is higher, and the user experience is more comfortable during operation.

[0004] The water circulation system of the fluorine non-in-home air conditioner exchanges heat with the refrigerant circulation system and outputs heat or cold to the indoor. The water circulation system needs to exchange heat with the refrigerant circulation system on the outdoor side while outputting heat or cold to the indoor, so part of the water circulation system is arranged on the indoor side and part is arranged on the outdoor side.

[0005] During the period when the ambient temperature is below 0℃ in winter, if the fluorine non-in-home air conditioning system is in a power-off state, the water circulation system in the outdoor side of the water circulation loop is prone to freezing, which may cause damage to the heat exchanger and refrigerant leakage.

[0006] In the prior art, the risk of water freezing is avoided by manually emptying the circulating water in the water circuit, which requires manual work. At the same time, it cannot cope with the situation of sudden power failure without human supervision, so in some special situations such as sudden power failure, the heat exchanger and other components are easily damaged due to the inability to manually prevent water in time.

[0007] Therefore, how to avoid the problem of pipe freezing is a problem that needs to be solved by those skilled in the art. Utility model content

[0008] Therefore, the purpose of the present application is to provide an air conditioning system to avoid the problem of pipe freezing.

[0009] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0010] The first aspect of the present application provides an air conditioning system, comprising a refrigerant circulation system and a water circulation system, the water circulation system comprising an outdoor side loop portion and an indoor side loop portion;

[0011] The water drainage pipeline is provided with a first temperature control valve in series, and the first temperature control valve is opened when the circulating water temperature in the outdoor side loop part is lower than a first preset temperature.

[0012] In a possible implementation, the water drainage pipeline is further provided with a second temperature control valve in series, and the second temperature control valve is opened when the ambient temperature is lower than a second preset temperature.

[0013] In a possible implementation, the second temperature control valve is located downstream of the first temperature control valve on the water drainage pipeline.

[0014] And / or,

[0015] The second temperature control valve and the first temperature control valve are bimetallic temperature control valves or self-operated temperature regulating valves.

[0016] In a possible implementation, the first preset temperature is 0-2°C.

[0017] And / or,

[0018] The second preset temperature is 0-2°C.

[0019] In a possible implementation, the water drainage pipeline is connected to the lowest point of the outdoor side loop part.

[0020] In a possible implementation, the water inlet side of the indoor side loop part is provided with a first on-off valve in series, and the water return side of the indoor side loop part is provided with a second on-off valve in series.

[0021] In a possible implementation, the first on-off valve and the second on-off valve are both electromagnetic valves that are turned on when powered on and turned off when powered off.

[0022] In a possible implementation, the first on-off valve and the second on-off valve are powered off when the air conditioning system is in a standby mode.

[0023] In a possible implementation, the water circulation system comprises:

[0024] A water circulation pipeline, one end of the water circulation pipeline being communicated with a first water port of a first heat exchanger of the refrigerant circulation system, and the other end of the water circulation pipeline being communicated with a second water port of the first heat exchanger.

[0025] a first circulating water pump and a user-side heat exchanger, which are connected in series on the water circulation pipeline, wherein the user-side heat exchanger is located in the indoor-side loop part, and the first circulating water pump is located in the outdoor-side loop part.

[0026] In a possible implementation, the water circulation system further comprises a buffer water tank connected in series on the water circulation pipeline, and the buffer water tank is located in the indoor-side loop part.

[0027] In a possible implementation, the water circulation pipeline comprises a plurality of user-side branches connected in parallel, and each of the user-side branches is connected in series with the user-side heat exchanger and is provided with a second circulating water pump.

[0028] In a possible implementation, the buffer water tank is provided with a water supplement port for communicating with a water supplement pipeline.

[0029] In a possible implementation, the refrigerant circulation system comprises a refrigerant circulation pipeline and a first heat exchanger, a second heat exchanger, a compressor and a throttling device connected in series on the refrigerant circulation pipeline.

[0030] The throttling device is located between the first heat exchanger and the second heat exchanger.

[0031] The first heat exchanger is a plate heat exchanger for heat exchange with the water circulation system.

[0032] In a possible implementation, the refrigerant circulation system further comprises a four-way valve, a first valve port of the four-way valve communicates with an exhaust port of the compressor, a second valve port communicates with a first refrigerant port of the first heat exchanger, a third valve port communicates with a first refrigerant port of the second heat exchanger, and a fourth valve port communicates with a suction port of the compressor.

[0033] When the refrigerant circulation system is in a heating mode, the first valve port and the second valve port of the four-way valve are communicated, and the third valve port and the fourth valve port are communicated.

[0034] When the refrigerant circulation system is in a cooling mode, the first valve port and the third valve port of the four-way valve are communicated, and the second valve port and the fourth valve port are communicated.

[0035] The air conditioning system provided in this application adds a drain pipe to the outdoor circuit section of the water circulation system, and installs a first thermostatic valve on the drain pipe. The first thermostatic valve can switch between open and closed states by detecting the medium temperature, and it does not require electrical power. When the circulating water temperature in the outdoor circuit section is lower than a first preset temperature, the first thermostatic valve automatically opens, and the circulating water in the water circulation system can be discharged through the drain pipe, thereby preventing the pipes from freezing due to temperatures dropping below 0°C. Because the circulating water in the water circulation system is discharged, the circulating water in the heat exchanger that exchanges heat with the water circulation system in the refrigerant circulation system is also discharged, thus preventing heat exchanger damage caused by freezing. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a system diagram of the air conditioning system disclosed in the embodiments of this application;

[0038] Figure 2 This is a system diagram of an air conditioning system disclosed in another embodiment of this application.

[0039] The meanings of the various reference numerals in the figure are as follows:

[0040] 101-Compressor; 102-Four-way valve; 103-First heat exchanger; 104-Throttling element; 105-Second heat exchanger;

[0041] 201 - First circulating water pump; 202 - Buffer water tank; 203 - Second circulating water pump; 204 - User-end heat exchanger;

[0042] 301 - First switching valve; 302 - Second switching valve; 303 - First temperature control valve; 304 - Second temperature control valve. Detailed Implementation

[0043] This application discloses an air conditioning system to avoid the problem of pipe freezing.

[0044] Hereinafter, the embodiments will be described with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the application described in the claims in any way. Furthermore, the entire contents of the configurations shown in the embodiments below are not limited to what is necessary for the solution of the application described in the claims. Note that only the portions relevant to the application are shown in the drawings for ease of description. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0045] As shown in Figure 1 The air conditioning system disclosed in the embodiments of the present application includes a refrigerant circulation system and a water circulation system. The heat exchange medium circulating in the refrigerant circulation system is refrigerant. The refrigerant circulation system generally includes a refrigerant circulation pipeline and a first heat exchanger 103, a second heat exchanger 105, a compressor 101, and a throttling device 104 connected in series on the refrigerant circulation pipeline.

[0046] The throttling device 104 is located between the first heat exchanger 103 and the second heat exchanger 105. The first heat exchanger 103 is a plate heat exchanger for heat exchange with the water circulation system. The refrigerant circulation system uses the compressor 101 to drive the refrigerant to circulate in the refrigerant circulation loop, that is, the compressor 101 is responsible for compressing the low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant, and driving the refrigerant to circulate in the refrigerant circulation loop.

[0047] One of the first heat exchanger 103 and the second heat exchanger 105 is a condenser, and the other is an evaporator. The condenser is used to cool the high-temperature and high-pressure refrigerant discharged by the compressor 101, so that it condenses into high-pressure liquid refrigerant. The condenser releases heat by exchanging heat with the outside. The evaporator is a key component for the refrigerant to absorb surrounding heat and convert it into cold. In the evaporator, the liquid refrigerant evaporates rapidly, absorbs the surrounding heat, and thus reduces the temperature, achieving the refrigeration effect. The throttling device 104 serves as a dividing point between high and low pressures, throttles and depressurizes the high-pressure liquid refrigerant, and adjusts the amount of liquid refrigerant entering the evaporator to adapt to changes in refrigeration load. At the same time, it can also prevent the occurrence of liquid knock phenomenon of the compressor, and ensure the safe operation of the system.

[0048] As can be understood by those skilled in the art, the throttling device 104 can be an electronic expansion valve or a capillary tube, and the specific type of the throttling device 104 is not limited in the embodiments.

[0049] It should be noted that if the refrigerant circulation system has a switching function for refrigeration and heating, the refrigerant circulation system can include a four-way valve 102. The four-way valve 102 has four valve ports, which are defined as a first valve port, a second valve port, a third valve port, and a fourth valve port.

[0050] The first valve port of the four-way valve 102 is in communication with the exhaust port of the compressor 101, the second valve port is in communication with the first refrigerant port of the first heat exchanger 103, the third valve port is in communication with the first refrigerant port of the second heat exchanger 105, and the fourth valve port is in communication with the suction port of the compressor 101.

[0051] Taking the first heat exchanger 103 and the water circulation system as an example, when the refrigerant circulation system is in a heating mode, the first valve port and the second valve port of the four-way valve 102 are in communication, and the third valve port and the fourth valve port are in communication. That is, the exhaust port of the compressor 101 is in communication with the first refrigerant port of the first heat exchanger 103 (the first heat exchanger 103 is a condenser), the second refrigerant port of the first heat exchanger 103 is in communication with the first side of the throttling device 104. The first refrigerant port of the second heat exchanger 105 is in communication with the suction port of the compressor 101, and the second refrigerant port of the second heat exchanger 105 is in communication with the second side of the throttling device 104.

[0052] When the refrigerant circulation system is in a cooling mode, the first valve port and the third valve port of the four-way valve 102 are in communication, and the second valve port and the fourth valve port are in communication. The exhaust port of the compressor 101 is in communication with the first refrigerant port of the second heat exchanger 105, the second refrigerant port of the second heat exchanger 105 is in communication with the second side of the throttling device 104, the suction port of the compressor 101 is in communication with the first refrigerant port of the first heat exchanger 103 (the first heat exchanger 103 is an evaporator), and the second refrigerant port of the first heat exchanger 103 is in communication with the first side of the throttling device 104.

[0053] It should be noted that a liquid storage tank (not shown in the figure) can also be added to the circuit of the refrigerant circulation system. The liquid storage tank can store excess liquid refrigerant when the load of the refrigerant circulation system changes, preventing too much refrigerant from entering the evaporator and affecting system efficiency. The liquid storage tank can also adjust the refrigerant flow according to the needs of the refrigerant circulation system to ensure stable operation, prevent flow fluctuations, and improve system stability.

[0054] In addition, the liquid storage tank can separate gas refrigerant and liquid refrigerant before the refrigerant enters the throttling device 104, ensuring that only liquid refrigerant enters the throttling device 104 and improving efficiency. The liquid storage tank stores liquid refrigerant, which can prevent it from entering the compressor 101 and avoid liquid damage to the compressor. When the load changes, the liquid storage tank can provide a buffer to store or release refrigerant, enhancing the system's adaptability and maintaining stable operation.

[0055] The water circulation system is used for heat exchange with one of the first heat exchanger 103 and the second heat exchanger 105. Taking the water circulation system and the first heat exchanger 103 as an example, the water circulating in the water circulation system enters the first heat exchanger 103 and exchanges heat with the refrigerant in the first heat exchanger 103, causing the heat exchanger of the water circulation system to generate corresponding heat or cold to be radiated to the indoor environment of the user.

[0056] Those skilled in the art will understand that a portion of the water circulation system is located indoors to radiate heat or cold into the user's indoor environment; another portion is located outdoors to exchange heat with the first heat exchanger 103 on the outdoor side. For ease of understanding, the portion located outdoors is defined as the outdoor-side loop portion, and the portion located indoors is defined as the indoor-side loop portion.

[0057] The air conditioning system also includes a drainage pipe connected to the outdoor circuit section, that is, one or more drainage pipes are connected at a certain location in the outdoor circuit section. In other words, the number of drainage pipes is not limited to one, and those skilled in the art can arrange a drainage pipe at multiple locations in the outdoor circuit section as needed.

[0058] The outlet end of the drainage pipe can be directly opened, meaning that the circulating water in the water circulation system can be discharged outdoors through the drainage pipe; of course, the outlet end of the drainage pipe can also be connected to a corresponding receiving device, so that the drainage pipe can discharge the circulating water into the receiving device to prevent pollution to the external environment.

[0059] A first temperature control valve 303 is connected in series on the drainage pipe. The first temperature control valve 303 can switch between open and closed states by detecting the temperature of the circulating water, and it does not require electrical power to drive it. The first temperature control valve 303 can be a bimetallic temperature control valve or a self-operated temperature regulating valve. In this embodiment, the specific type of the first temperature control valve 303 is not limited, as long as the valve can automatically open and close in response to temperature.

[0060] When the circulating water temperature in the outdoor circuit is lower than the first preset temperature, the first thermostatic valve 303 opens. Those skilled in the art can adjust the first preset temperature as needed; for example, the temperature value of the first preset temperature can be selected between 0 and 2°C. That is, the first preset temperature is set above the freezing point of water (0°C), and the first preset temperature cannot be too high; otherwise, the first thermostatic valve 303 will easily open and drain water, easily causing waste of circulating water.

[0061] During periods when the ambient temperature is below 0°C, such as in winter, if the air conditioning system is powered off, the outdoor circuit of the water circulation system is prone to freezing due to the low ambient temperature. In particular, if the water circulation pipe of the first heat exchanger 103 freezes, it may damage the first heat exchanger 103, or even cause the refrigerant pipe of the first heat exchanger 103 to burst due to the expansion of the water circulation pipe, leading to refrigerant leaks and other accidents.

[0062] The air conditioning system disclosed in this application adds a drain pipe to the outdoor circuit section of the water circulation system, and a first thermostatic valve 303 is installed on the drain pipe. Once the air conditioning system is in a power-off state, the water in the outdoor circuit section loses the condition for heat exchange with the refrigerant, and the temperature gradually decreases.

[0063] When the temperature of the circulating water in the outdoor-side loop portion is lower than the first preset temperature, the first temperature control valve 303 is automatically opened, and the circulating water in the water circulation system can be discharged through the drain pipeline, thereby avoiding the problem of freezing of the pipeline caused by the temperature being reduced to below 0°C. Since the circulating water in the water circulation system is discharged, the circulating water in the first heat exchanger 103 in the refrigerant circulation system, which exchanges heat with the water circulation system, is also discharged, thereby avoiding the problem of damage to the heat exchanger caused by icing.

[0064] It cannot be ruled out that the temperature of the circulating water in the outdoor-side loop portion is lower than the first preset temperature, but the current ambient temperature is relatively high, and there is no risk of freezing. However, when the temperature of the circulating water is lower than the first preset temperature, the first temperature control valve 303 is automatically opened to drain water. Since the ambient temperature is not sufficient to cause the temperature of the circulating water to gradually decrease until freezing, and the water in the water circulation system is discharged at this time, it will undoubtedly cause waste of water.

[0065] In addition, when the ambient temperature is high in summer, there is also a scenario of application, that is, when the first heat exchanger 103 is an evaporator, at this time, the indoor-side loop portion is in a refrigeration state for radiating cold energy to the indoor environment. In this scenario, the temperature of the circulating water in the water circulation system is low, and there is a possibility of being lower than the first preset temperature, that is, the condition for opening the first temperature control valve 303 is met, at this time, if the first temperature control valve 303 is opened, it will undoubtedly cause waste of water.

[0066] Based on this, in the present embodiment, a second temperature control valve 304 is further connected in series on the drain pipeline, and the second temperature control valve 304 can be switched between open and closed states by detecting the ambient temperature, and does not need to be driven by electricity. The second temperature control valve 304 can be a bimetallic temperature control valve or a self-acting temperature regulating valve, and the present embodiment does not limit the specific type of the second temperature control valve 304, as long as the valve can be automatically opened and closed under the influence of temperature.

[0067] The second temperature control valve 304 can be selected to be the same type of temperature control valve as the first temperature control valve 303, or can be selected to be a different type of temperature control valve from the first temperature control valve 303.

[0068] When the ambient temperature outside is lower than the second preset temperature, the second temperature control valve 304 is opened. Those skilled in the art can adjust the second preset temperature according to the needs, for example, the temperature value of the second preset temperature can be selected between 0-2°C. That is, the second preset temperature is set to be greater than the freezing temperature of water 0°C, and the second preset temperature cannot be too high, otherwise the second temperature control valve 304 is more likely to be opened, which is easy to cause waste of circulating water.

[0069] In the time period when the ambient temperature is below 0℃, such as in winter, if the air conditioning system is in a power-off state, the outdoor side loop part of the water circulation system is prone to freezing due to the low ambient temperature. When the circulating water temperature in the outdoor side loop part is lower than the first preset temperature, the first temperature control valve 303 is automatically opened, and at the same time, the ambient temperature is also lower than the second preset temperature, and the second temperature control valve 304 is also automatically opened. Since the first temperature control valve 303 and the second temperature control valve 304 are both in the open state, the circulating water in the water circulation system can be discharged through the drain pipe, thereby avoiding the problem of pipe freezing caused by the temperature being reduced to below 0℃. Since the circulating water in the water circulation system is discharged, the circulating water in the first heat exchanger 103 of the refrigerant circulation system, which exchanges heat with the water circulation system, is also discharged, thereby avoiding the problem of heat exchanger damage caused by icing.

[0070] When in the summer cooling mode or other application scenarios, if the circulating water temperature in the outdoor side loop part is lower than the first preset temperature, causing the first temperature control valve 303 to open, and at the same time, the ambient temperature is relatively high, not meeting the condition of being lower than the second preset temperature, so the second temperature control valve 304 is in the closed state, at this time the drain pipe cannot drain water, so as to avoid the waste of water resources.

[0071] On the drain pipe, the second temperature control valve 304 is located downstream of the first temperature control valve 303, so that the first temperature control valve 303 is more easily contacted with the circulating water in the outdoor side loop part, and the second temperature control valve 304 is also more easily collected with the ambient temperature, less affected by the water temperature. By arranging the positional relationship of the first temperature control valve 303 and the second temperature control valve 304, the medium temperature collected by the two temperature control valves is more accurate, less affected by other medium temperatures, and the accuracy of drainage is improved.

[0072] In order to ensure that the water can be completely drained when the drainage condition is met, in this embodiment, the drain pipe is connected to the lowest point of the outdoor side loop part. By arranging in this way, it can be ensured that the circulating water in the outdoor side loop part can be completely drained, avoiding freezing of the remaining part.

[0073] Since the indoor side loop part and the outdoor side loop part of the water circulation system are in communication, when the first heat exchanger 103 and the second heat exchanger 105 on the drain pipe are both opened for drainage, in addition to the water in the outdoor side loop part being drained, the water in the indoor side loop part is also drained at the same time. Since the indoor side loop part has a user end heat exchanger 204, a large amount of water resources will be stored, and if they are drained together, it will cause serious waste of water resources.

[0074] Based on this, in an embodiment of the present application, a first switch valve 301 is arranged in series on the water inlet side of the indoor side circuit part, and a second switch valve 302 is arranged in series on the water outlet side of the indoor side circuit part. When power failure is detected, the first switch valve 301 and the second switch valve 302 can be closed, so that the water in the indoor side circuit part is enclosed in the pipeline of the indoor side circuit part and cannot be drained by the drain pipeline. When the air conditioning system is not used in winter, the first switch valve 301 and the second switch valve 302 can also be closed, so that only the water in the outdoor side circuit part is drained by the drain pipeline, and the water in the indoor side circuit part is not drained, thereby achieving the effect of saving water resources.

[0075] To improve the automation effect, in the embodiment, the first switch valve 301 and the second switch valve 302 are both electromagnetic valves that are turned on when powered on and turned off when powered off. When the power grid is powered off or the air conditioning system is powered off due to other faults, the first switch valve 301 and the second switch valve 302 are powered off, the electromagnetic force is lost, the valve core is driven to reset by the spring mechanism, so that the first switch valve 301 and the second switch valve 302 are in a closed state, and the indoor side circuit part and the outdoor side circuit part are isolated by the first switch valve 301 and the second switch valve 302. When the circulating water temperature is lower than a first preset temperature and the ambient temperature is lower than a second preset temperature, the first temperature control valve 303 and the second temperature control valve 304 are both opened, so that the water in the outdoor side circuit part is drained by the drain pipeline, and the water in the indoor side circuit part is enclosed in the indoor side circuit part.

[0076] When the air conditioning system is powered on again, the first switch valve 301 and the second switch valve 302 are powered on, and run in a conduction mode. The first switch valve 301 and the second switch valve 302 lose the blocking effect on the indoor side circuit part and the outdoor side circuit part, so that the indoor side circuit part and the outdoor side circuit part resume the communication state.

[0077] The circulating water of the indoor side circuit part is conducted to the outdoor side circuit part. Since the indoor ambient temperature is high, the circulating water temperature in the indoor side circuit part is high. After the circulating water of the indoor side circuit part flows through the outdoor side circuit part and the drain pipeline, the first temperature control valve 303 detects that the water temperature exceeds the first preset temperature, and then returns to the closed state, thereby avoiding the problem that the circulating water in the indoor side circuit part is drained by the drain pipeline after the air conditioning system is powered on again.

[0078] Further, when the air conditioning system is in standby mode, the first switch valve 301 and the second switch valve 302 are powered off and closed. When the air conditioning system is in standby mode, the circulating water pump of the water circulation system is in standby mode and does not work, so the water in the water circulation system does not flow; in addition, the refrigerant circulation system is also in standby mode and does not work, and the first heat exchanger 103 and the second heat exchanger 105 do not generate heat / cold. In this mode, although the air conditioning system is not powered off, if the outdoor ambient temperature is too low, the outdoor side circuit part still has the risk of freezing.

[0079] In this embodiment, through program control, when the air conditioning system is in standby mode, the first switch valve 301 and the second switch valve 302 are in a powered-off state. The indoor side circuit part and the outdoor side circuit part are isolated by the first switch valve 301 and the second switch valve 302. Even when the circulating water temperature is lower than the first preset temperature and the ambient temperature is lower than the second preset temperature, the drain pipeline can only drain the water of the outdoor side circuit part, and the water in the indoor side circuit part is sealed in the indoor side circuit part.

[0080] In an embodiment of the present application, the water circulation system can include a water circulation pipeline, a first circulating water pump 201, and a user end heat exchanger 204.

[0081] The water circulation pipeline is connected to the first water port of the first heat exchanger 103 of the refrigerant circulation system at one end, and connected to the second water port of the first heat exchanger 103 at the other end, so that the water in the water circulation pipeline can enter the water heat exchange pipeline of the first heat exchanger 103, exchange heat with the refrigerant heat exchange pipeline of the first heat exchanger 103, and take away the heat / cold.

[0082] The first circulating water pump 201 and the user end heat exchanger 204 are connected in series on the water circulation pipeline, and the user end heat exchanger 204 is located in the indoor side circuit part and the first circulating water pump 201 is located in the outdoor side circuit part. The user end heat exchanger 204 can be used for heat exchange with the indoor environment, i.e., it can directly cool or heat the indoor air. The user end heat exchanger 204 can also be other heat exchangers, such as a heat exchanger for heat exchange with a water heater for heating water in the water heater. The present embodiment does not limit the specific type and application scenario of the user end heat exchanger 204.

[0083] The user end heat exchanger 204 can be a terminal radiator, such as one or more of a fan coil, a floor heating heat exchanger, and a water heater. Those skilled in the art can understand that the floor heating heat exchanger and the water heater are two different heater products, and the floor heating heat exchanger is arranged under the floor, and the water heater is usually hung on the side wall.

[0084] The first circulating water pump 201 is used to circulate water in the water circulation system. In this embodiment, the first circulating water pump 201 is arranged in the outdoor side loop part, that is, the first circulating water pump 201 is integrated in the outdoor unit. Since the first circulating water pump 201 will generate noise during operation, integrating the first circulating water pump 201 in the outdoor unit can reduce the noise on the indoor side.

[0085] Further, the water circulation system can further include a buffer tank 202 connected in series on the water circulation pipeline, and the buffer tank 202 is located in the indoor side loop part. The main function of the buffer tank 202 is to absorb and adjust the volume expansion caused by the change of water temperature, so as to maintain the stable pressure of the water circulation system, prevent the pressure from being too high, and protect the equipment on the water circulation system.

[0086] In this embodiment, the buffer tank 202 can be arranged upstream of the user end heat exchanger 204, so that the water in the buffer tank 202 is water that has not been heat exchanged by the user end heat exchanger 204, and the water temperature in the buffer tank 202 is higher / lower (in the heating mode, the water temperature in the buffer tank 202 is higher, and in the cooling mode, the water temperature in the buffer tank 202 is lower). It can more effectively absorb the volume expansion caused by the change of water temperature, avoid the fluctuation of system pressure, and be more conducive to maintaining the stable system pressure, preventing the pressure from being too high or too low to cause damage to the equipment and pipeline.

[0087] In a specific embodiment of the present application, the water circulation pipeline can include a plurality of parallel user end branches, each of which is connected in series with a user end heat exchanger 204, and each of which is connected in series with a second circulating water pump 203 (as shown in Figure 2 The number of user end branches can be arranged according to the demand, for example, the number of user end branches can be set according to the number of rooms, or the number of user end branches can be arranged according to other demands. The number of user end branches is not limited in this embodiment.

[0088] Each user end branch is connected in series with a user end heat exchanger 204, which exchanges heat with the environment in the corresponding room through each user end heat exchanger 204 to meet the temperature rising / temperature lowering demand. Each user end branch can be independently controlled to run through a valve, and one or more user end branches can be closed according to the demand to achieve the effect of energy saving.

[0089] The first circulating water pump 201 is responsible for maintaining the circulation of the entire water circulation system, while the second circulating water pump 203 arranged on each user end branch is used to meet the special needs of the specific branch. For example, some user end branches may require higher flow or pressure, and the first circulating water pump 201 cannot meet these requirements alone. The second circulating water pump 203 on the user end branch can independently adjust the flow and pressure of the user end branch to ensure the normal operation of the user end branch. Moreover, in a complex water circulation system, the first circulating water pump 201 can cause insufficient flow at the far end. The second circulating water pump 203 can supplement the local flow to balance the hydraulic distribution of the system. Some user end branches require precise temperature control, and the second circulating water pump 203 can speed up the circulation speed of the medium in the user end branch, improving the response speed and accuracy of temperature control. Each second circulating water pump 203 can also share the load of the first circulating water pump 201, reduce the operating pressure of the first circulating water pump 201, prolong its service life, and reduce energy consumption.

[0090] Further, the buffer tank 202 is provided with a water supplement port for communicating with a water supplement pipeline. When the water level in the buffer tank 202 drops to a water supplement level, the water supplement pipeline automatically supplements water into the buffer tank 202, ensuring the stability of the water level in the buffer tank 202.

[0091] As shown in the present application and claims, unless the context clearly indicates otherwise, "one", "a", "an", and / or "the" do not refer to the singular, but can also include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The element defined by the phrase "comprising a" does not exclude the presence of another identical element in the process, method, product or device comprising the element.

[0092] In the description of the present application, unless otherwise explicitly limited, the words setting, installing, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0093] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be mutually referred to.

[0094] The principles and implementations of the present application are described in the above examples, which are only used to help understand the method and its core idea of the present application. It should be pointed out that, for those skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An air conditioning system comprising a refrigerant circulation system and a water circulation system, characterized by, The water circulation system comprises an outdoor side loop part and an indoor side loop part; The water circulation system further comprises a drain pipeline in communication with the outdoor side loop part, wherein a first temperature control valve (303) is arranged in series on the drain pipeline, and the first temperature control valve (303) is opened when the temperature of the circulating water in the outdoor side loop part is lower than a first preset temperature.

2. The air conditioning system of claim 1, wherein, A second temperature control valve (304) is further arranged in series on the drain pipeline, and the second temperature control valve (304) is opened when the ambient temperature is lower than a second preset temperature.

3. The air conditioning system of claim 2, wherein, The second temperature control valve (304) is located downstream of the first temperature control valve (303) on the drain pipeline. The second temperature control valve (304) and the first temperature control valve (303) are bimetallic temperature control valves or self-operated temperature regulating valves. The first preset temperature is 0-2°C.

4. The air conditioning system of claim 2, wherein, The second preset temperature is 0-2°C. The drain pipeline is connected to the lowest point of the outdoor side loop part. A first on-off valve (301) is arranged in series on the water inlet side of the indoor side loop part, and a second on-off valve (302) is arranged in series on the water return side of the indoor side loop part.

5. The air conditioning system of claim 1, wherein, The first on-off valve (301) and the second on-off valve (302) are both electromagnetic valves that are turned on when powered on and turned off when powered off.

6. The air conditioning system according to any one of claims 1 to 5, wherein When the air conditioning system is in standby mode, the first on-off valve (301) and the second on-off valve (302) are powered off.

7. The air conditioning system of claim 6, wherein, The water circulation system comprises:

8. The air conditioning system of claim 7, wherein, A water circulation pipeline, one end of which is in communication with a first water port of a first heat exchanger (103) of the refrigerant circulation system, and the other end of which is in communication with a second water port of the first heat exchanger (103); 9. The air conditioning system of any one of claims 1-5, wherein, A first circulating water pump (201) and a user end heat exchanger (204), which are arranged in series on the water circulation pipeline, wherein the user end heat exchanger (204) is located in the indoor side loop part, and the first circulating water pump (201) is located in the outdoor side loop part. The water circulation system further comprises a buffer water tank (202) arranged in series on the water circulation pipeline, and the buffer water tank (202) is located in the indoor side loop part. The buffer water tank (202) is provided with a water supplement port for communication with a water supplement pipeline.

10. The air conditioning system of claim 9, wherein, The water circulation pipeline comprises a plurality of parallel user end branches, each of which is provided with the user end heat exchanger (204) and a second circulating water pump (203) arranged in series thereon.

11. The air conditioning system of claim 10, wherein, The refrigerant circulation system comprises a refrigerant circulation pipeline and a first heat exchanger (103), a second heat exchanger (105), a compressor (101) and a throttling device (104) arranged in series on the refrigerant circulation pipeline; 12. The air conditioning system of claim 9, wherein, The throttling device (104) is located between the first heat exchanger (103) and the second heat exchanger (105).

13. The air conditioning system of any one of claims 1-5, wherein, The first heat exchanger (103) is a plate heat exchanger for heat exchange with the water circulation system. ​ ​ 14. The air conditioning system of claim 13, wherein, The refrigerant circulation system further comprises a four-way valve (102), a first valve port of the four-way valve (102) is communicated with a discharge port of the compressor (101), a second valve port is communicated with a first refrigerant port of the first heat exchanger (103), a third valve port is communicated with a first refrigerant port of the second heat exchanger (105), and a fourth valve port is communicated with a suction port of the compressor (101); When the refrigerant circulation system is in a heating mode, the first valve port and the second valve port of the four-way valve (102) are communicated, and the third valve port and the fourth valve port are communicated; When the refrigerant circulation system is in a cooling mode, the first valve port and the third valve port of the four-way valve (102) are communicated, and the second valve port and the fourth valve port are communicated.

Images