An air conditioning system

Abstract

The embodiment of the present application provides a kind of air conditioning system, for identifying whether the water flow in the water system of air conditioning system is too low according to the temperature value detected.The air conditioning system provided by the embodiment of the present application includes: water fluorine heat exchanger and outdoor heat exchanger connected by pipeline, water pump connected with water fluorine heat exchanger to form water system, controller;Wherein, the water inlet of water fluorine heat exchanger is provided with water inlet temperature sensor, for detecting water inlet temperature value;Water fluorine heat exchanger outlet is provided with outlet temperature sensor, for detecting outlet temperature value;Temperature sensor is arranged on outdoor heat exchanger, for detecting ambient temperature value;Controller is configured to determine whether the water flow in water system is too low according to water inlet temperature value, outlet temperature value and ambient temperature value.The water flow condition in the water system can be detected according to the temperature value of water flow in the process of air conditioning operation, and the condition that water flow is too low can be well identified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning systems, in particular to an air conditioning system. BACKGROUND

[0002] The outdoor unit of the air conditioning system can include a water system for producing hot water to realize heating using the water system in winter. The water-fluorine heat exchanger of the air conditioning system is directly connected between the compressor discharge pipe and the liquid side stop valve, and the water-fluorine heat exchanger is on the high pressure side of the system regardless of the operation mode of the outdoor unit, and no freezing problem occurs during operation, but the water flow in the water system needs to be identified to prevent the water pump impeller from being stuck or the water pipeline from being dirty and blocked, and problems such as overheating and burning of the water pump motor or failure of the water system to heat.

[0003] The main method for identifying low water flow at present is to increase the water flow switch device. This method separately increases the water flow switch and the base for installing the water flow switch in the water system, and has certain requirements for the direction and length of the water pipeline before and after the water flow switch and the target sheet of the water flow switch. Therefore, not only the material cost is increased, the installation space is reserved, but also the workers need to pay attention to the installation skills. There is also a method of controlling through the flow feedback function of the direct-current variable frequency water pump, but the cost of the water pump with flow feedback function is greatly increased than that of the general water pump, and this method is only suitable for occasions where the outdoor unit is equipped with a water pump and the internal space of the outdoor unit is effective.

[0004] Therefore, how to determine the low water flow in the water system of the air conditioning system becomes a problem to be solved. SUMMARY

[0005] The present application provides an air conditioning system for determining whether the water flow in the water system is too low through the change of the temperature in the system.

[0006] The first aspect of the embodiment of the present application provides an air conditioning system, which comprises a water-fluorine heat exchanger and an outdoor heat exchanger connected through a pipeline, a water pump connected with the water-fluorine heat exchanger to form a water system, and a controller.

[0007] The controller is connected with the water-fluorine heat exchanger, the outdoor heat exchanger and the water pump respectively.

[0008] The water inlet of the water-fluorine heat exchanger is provided with a water inlet temperature sensor for detecting a water inlet temperature value Twi and outputting Twi to the controller.

[0009] The water outlet of the water-fluorine heat exchanger is provided with a water outlet temperature sensor for detecting a water outlet temperature value Two and outputting Two to the controller.

[0010] The outdoor heat exchanger is provided with a temperature sensor for detecting an ambient temperature value Ta and outputting Ta to the controller.

[0011] The controller is configured to:

[0012] Determine whether the water flow in the water system is too low according to the Twi, the Two, and the Ta.

[0013] With reference to the first implementation manner of the first aspect, the air conditioning system further comprises a compressor, and a pressure sensor is arranged on the compressor to detect an exhaust pressure value Pd and output the Pd to the controller.

[0014] Before the step of determining whether the water flow in the water system is too low according to the Twi, the Two, and the Ta, the controller is further configured to:

[0015] When the water pump runs for the first time, determine whether MaxΔTwi and MaxΔTwo are less than or equal to a first threshold value, MaxΔTwi being a difference between a maximum value and a minimum value of the Twi detected in the first time, and MaxΔTwo being a difference between a maximum value and a minimum value of the Two detected in the first time.

[0016] If it is determined that the MaxΔTwi and the MaxΔTwo are less than or equal to the first threshold value, then in a target time period [the compressor runs for a second time, and the water pump runs for a third time],

[0017] Determine whether the water flow in the water system is too low according to at least one of the Twi, the Two, the Ta, and the Pd, the second time being greater than the first time, and the third time being greater than the second time.

[0018] With reference to the second implementation manner of the first aspect, the step of determining whether the water flow in the water system is too low according to the Twi, the Two, and the Ta comprises:

[0019] After the water pump runs for the first time, count a first duration in which a difference between the Twi and the Two is greater than or equal to a second threshold value, and count a second duration in which a difference between the Two and the Twi is greater than or equal to f(Ta, Twi(0)), f(Ta, Twi(0)) being related to the Ta and a Twi(0), the Twi(0) being the Twi detected before the water pump runs.

[0020] If the first duration or the second duration is equal to a preset time, it is determined that the water flow in the water system is too low.

[0021] With reference to the third implementation manner of the first aspect, the step of determining whether the water flow in the water system is too low according to at least one of the Twi, the Two, the Ta, and the Pd comprises:

[0022] Determine whether ΔTwi is greater than a second threshold value and whether the Pd is greater than or equal to f(Ta, Twi), ΔTwi being a difference between the Twi and a Twi(0), and f(Ta, Twi) being related to the Ta and the Twi.

[0023] If the difference between Twi and Twi(0) is greater than the second threshold value and Pd is greater than or equal to f(Ta, Twi), it is determined that the water flow in the water system is too low.

[0024] With reference to the fourth implementation manner of the first aspect, the step of determining whether the water flow in the water system is too low according to at least one of Twi, Two, Ta and Pd comprises:

[0025] determining whether ΔTwo is greater than a third threshold value and whether Pd is greater than or equal to f(Ta, Two), ΔTwo being the difference between Two and Two(0), Two(0) being the detected Two before the water pump is operated, and f(Ta, Two) being related to Ta and Two;

[0026] If it is determined that the difference between Two and Two(0) is greater than the third threshold value and Pd is greater than or equal to f(Ta, Two), it is determined that the water flow in the water system is too low.

[0027] With reference to the fifth implementation manner of the first aspect, the step of determining whether the water flow in the water system is too low according to at least one of Twi, Two, Ta and Pd comprises:

[0028] determining whether ΔTwi is greater than a fourth threshold value or determining whether ΔTwo is greater than a fifth threshold value;

[0029] If it is determined that ΔTwi is greater than the fourth threshold value or ΔTwo is greater than the fifth threshold value, it is determined that the water flow in the water system is too low.

[0030] The air conditioning system provided by the embodiments of the present application can determine whether the water flow is too low according to the temperature value detected by the temperature sensor during the operation of the air conditioning system. Since the water flow in the water system is different, the temperature change of the water flow is also different, so the temperature change of the water flow can be used to accurately determine whether the water flow is too low.

[0031] The second aspect of the embodiments of the present application provides an air conditioning system, which comprises a water-fluorine heat exchanger, an outdoor heat exchanger, a compressor, a water pump and a controller.

[0032] The water-fluorine heat exchanger, the outdoor heat exchanger and the compressor are connected by pipelines.

[0033] The water pump is connected with the water-fluorine heat exchanger to form a water system.

[0034] The controller is connected with the compressor, the water-fluorine heat exchanger, the water pump and the outdoor heat exchanger respectively.

[0035] A first temperature sensor is arranged on the water-fluorine heat exchanger, used to obtain a water flow temperature value Tw and output Tw to the controller.

[0036] The outdoor heat exchanger is provided with a second temperature sensor for obtaining an ambient temperature value Ta, and outputting Ta to the controller.

[0037] The compressor is provided with a pressure sensor for obtaining an exhaust pressure value Pd, and outputting Pd to the controller.

[0038] The controller is configured to:

[0039] Determine whether the water flow in the water system is too low according to Tw, Ta and Pd.

[0040] In combination with the first implementation manner of the second aspect, the step of determining whether the water flow in the water system is too low according to Tw, Ta and Pd includes:

[0041] When the water pump runs for a first time, determine whether MaxΔTw is less than or equal to a first threshold value; MaxΔTw is the difference between the maximum value and the minimum value of Tw detected within the first time;

[0042] If it is determined that MaxΔTw is less than or equal to the first threshold value, then within a target time period [the compressor runs for a second time, and the water pump runs for a third time],

[0043] Determine whether the water flow in the water system is too low according to at least one of Tw, Ta and Pd, the second time is greater than the first time, and the third time is greater than the second time.

[0044] In combination with the second implementation manner of the second aspect, the step of determining whether the water flow in the water system is too low according to at least one of Tw, Ta and Pd includes:

[0045] If the difference between Tw and Tw(0) is greater than a second threshold value, and Pd is greater than or equal to f(Ta, Tw), then it is determined that the water flow in the water system is too low, Tw(0) is Tw detected before the water pump runs, and f(Ta, Tw(0)) is related to Ta and Tw(0).

[0046] In combination with the third implementation manner of the second aspect, the step of determining whether the water flow in the water system is too low according to at least one of Tw, Ta and Pd includes:

[0047] If the difference between Tw and Tw(0) is greater than a third threshold value, then it is determined that the water flow in the water system is too low.

[0048] The beneficial effects described in the second aspect can be analyzed with reference to the beneficial effects of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0049] The accompanying drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used to explain the technical solutions of the present application together with the embodiments of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0050] Figure 1 A structural schematic diagram of an outdoor unit of an air conditioning system is provided for an embodiment of the present application.

[0051] Figure 2 A structural schematic diagram of an outdoor unit of an air conditioning system is provided for an embodiment of the present application.

[0052] Figure 3 A flow chart of a method for identifying excessively low water flow of an air conditioning system is provided for an embodiment of the present application.

[0053] Figure 4 A flow chart of a method for identifying excessively low water flow of an air conditioning system is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0055] The terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0056] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrally connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, when describing the pipeline, the "connected" and "connected" used in the present application have the meaning of conducting. The specific meaning should be understood in combination with the context.

[0057] In the embodiments of the present application, the words "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design presented as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or advantageous than other embodiments or design solutions. Rather, the use of "exemplary" or "for example" is intended to present concepts in a specific way. The embodiments of the present application described as "exemplary" or "for example" should not be interpreted as being more preferred or advantageous than other embodiments or design solutions.

[0058] The outdoor unit of the air conditioning system can include a water system for producing hot water, so as to realize refrigeration by using refrigerant in summer and heating by using refrigerant or the water system in winter. The water-fluorine heat exchanger of the air conditioning system is directly connected between the compressor discharge pipe and the liquid side stop valve, and is located at the high pressure side of the system regardless of the operation mode of the outdoor unit. In the operation process, freezing problem does not occur, but it is necessary to identify that the water flow in the water system is too low, so as to prevent the water pump impeller from being stuck or the water pipeline from being dirty and blocked, and prevent the water pump motor from being overheated and burned or the water system from being unable to heat.

[0059] At present, the main method for identifying that the water flow is too low is to increase a water flow switch device. This method separately increases the water flow switch and a base for installing the water flow switch in the water system, and has certain requirements for the direction and length of the water pipeline before and after the water flow switch and the target sheet of the water flow switch. Therefore, not only the material cost is increased, the installation space is reserved, but also the installation skill of workers needs to be paid attention to. Another method is to control through the flow feedback function of the direct-current variable frequency water pump. However, the cost of the water pump with the flow feedback function is greatly increased compared with the general water pump, and this method is only suitable for the occasions where the outdoor unit is provided with the water pump and the internal space of the outdoor unit is effective.

[0060] Based on this, the air conditioning system provided in the embodiments of the present application includes an indoor unit and an outdoor unit, please refer to Figure 1 , Figure 1 The structural schematic diagram of the outdoor unit of the air conditioning system provided in a feasible embodiment is shown.

[0061] As shown in Figure 1 , the outdoor unit of the air conditioning system can include a compressor 1, a one-way valve 2, a four-way reversing valve 3, an outdoor heat exchanger 4, a water-fluorine heat exchanger 5, a first expansion valve 6, a second expansion valve 7, a gas-liquid separator 8, a liquid side stop valve 9, a gas side stop valve 10 and a controller (not shown in the figure).

[0062] It should be noted that the air conditioning system further includes a water pump (not shown in the figure) connected with the water-fluorine heat exchanger 5 to form a water system, for providing power for the circulation of water flow in the water system. The water pump can be installed in the indoor unit as a built-in water pump, or can be installed outside the indoor unit as an external water pump, and the installation position of the water pump is not limited in the embodiments of the present application.

[0063] It should be understood that Figure 1 only part of the components of the outdoor unit are shown, and other components not shown can also exist in the outdoor unit.

[0064] In the embodiments of the present application, the compressor 1 is arranged between the four-way reversing valve 3 and the gas-liquid separator 8, for compressing the refrigerant, and inputting the compressed refrigerant into the circulation system through the four-way reversing valve 3, to provide power for the circulation of the refrigerant.

[0065] In the embodiment, the one-way valve 2 is arranged between the compressor 1 and the four-way valve 3, and is configured to allow the refrigerant to flow from the compressor 1 to the four-way valve 3 only, thereby avoiding the backflow of the refrigerant to the compressor 1.

[0066] In the embodiment, the four ports of the four-way valve 3 are connected to the exhaust port of the compressor 1 (not shown in the figure), the outdoor heat exchanger 4, the gas-liquid separator 8, and the indoor heat exchanger of the indoor unit.

[0067] In the embodiment, one end of the outdoor heat exchanger 4 is connected to the compressor 1 through the four-way valve 3, and the other end is connected to the indoor heat exchanger. The outdoor heat exchanger 4 is used to exchange heat between the refrigerant inside the outdoor heat exchanger 4 and outdoor air, so as to achieve the purpose of temperature adjustment.

[0068] In the embodiment, the refrigerant side of the water-fluorine heat exchanger 5 is connected to the compressor 1 and the liquid-side stop valve 9, and the other side of the water-fluorine heat exchanger 5 is provided with a water inlet and a water outlet, and is connected to a water pump to form a circulation loop of the water system. The water-fluorine heat exchanger 5 is used to exchange heat between the refrigerant and the water flow in the water system, so as to achieve the purpose of heating using the water system.

[0069] In the embodiment, the first expansion valve 6 and the second expansion valve 7 have the function of expanding and decompressing the refrigerant flowing in the pipeline, and are used to adjust the flow of the refrigerant in the pipeline.

[0070] In the embodiment, the inlet end of the gas-liquid separator 8 is connected to the four-way valve 3, and the outlet end of the gas-liquid separator 8 is connected to the inlet end of the compressor 1. The gas-liquid separator 8 is used to separate the refrigerant flowing into the compressor 1.

[0071] In the embodiment, the liquid-side stop valve 9 and the gas-side stop valve 10 are used to control the opening and closing of the valve core to control the passing and stopping of the refrigerant.

[0072] Optionally, the air conditioning system can further include an outdoor fan, an indoor fan, an indoor heat exchanger, and the like, which will not be described herein.

[0073] In some embodiments, as shown in Figure 2 The water inlet of the water-fluorine heat exchanger 5 is provided with a water inlet temperature sensor 21 for detecting a water inlet temperature value Twi, and the water outlet of the water-fluorine heat exchanger 5 is provided with a water outlet temperature sensor 22 for detecting a water outlet temperature value Two. The outdoor heat exchanger 4 is provided with a temperature sensor 23 for detecting an ambient temperature value Ta. The controller is configured to determine whether the water flow in the water system is too low according to the received water inlet temperature value Twi, water outlet temperature value Two, and ambient temperature value Ta.

[0074] The air conditioning system provided by the embodiments of the present application can determine whether the water flow is too low according to the temperature value detected by the temperature sensor during the operation of the air conditioning system. Since the water flow in the water system is different, the detected temperature change is also different, so the temperature change of the water flow can be used to accurately determine whether the water flow is too low. Meanwhile, when designing the water system of the air conditioning system, the installation direction of the water flow switch, the length of the straight pipe section of the water pipe and the installation space do not need to be considered, which greatly reduces the material cost and labor cost, and can bring better user experience.

[0075] Since there is a temperature difference between the indoor and outdoor before the water pump is operated, the water temperature in the outdoor part of the water system pipeline and the water temperature in the indoor part have a temperature difference, therefore, at the first time of the operation of the water pump, firstly, the change value of the inlet water temperature or the outlet water temperature is determined, if the change value is large, it indicates that there is water flow circulation between the indoor and outdoor, if the change value is small, it cannot be simply determined that the water flow has a problem, at this time, it is possible that the water temperature difference between the indoor and outdoor is small before the water pump is operated, therefore, it needs to be further operated and then determined according to the change of the water temperature.

[0076] As a feasible implementation manner, the compressor 1 is provided with a pressure sensor for detecting the discharge pressure value Pd. Before the step of determining whether the water flow in the water system is too low according to the received Twi, Two and Ta, the controller is further configured to:

[0077] At the first time of the operation of the water pump, it is determined whether MaxΔTwi and MaxΔTwo are less than or equal to a first threshold value. Wherein, MaxΔTwi is the difference between the maximum value and the minimum value of Twi detected in the first time; MaxΔTwo is the difference between the maximum value and the minimum value of Two detected in the first time.

[0078] If it is determined that MaxΔTwi and MaxΔTwo are less than or equal to the first threshold value, then in the target time period [the second time of the operation of the compressor, the third time of the operation of the water pump], it is determined whether the water flow in the water system is too low according to at least one of the received Twi, Two, Ta and Pd, the second time is greater than the first time, and the third time is greater than the second time.

[0079] In the embodiments of the present application, the first time, the second time and the third time are pre-set by the system, in the actual application process, the first time, the second time and the third time can be set according to the requirements, which are not limited in the embodiments of the present application. For example, as a feasible implementation manner, the first time is 1 min, the second time is 5 min, and the third time is 10 min.

[0080] In the embodiments of the present application, the first threshold is preset by the system, and in actual application, the first threshold can be set according to requirements, and the embodiments of the present application do not make any limitation thereon. For example, as a feasible implementation manner, the first threshold is 3, if Max (ΔTwi) ≤ 3 and Max (ΔTwo) ≤ 3 are both true, the water flow condition cannot be determined, and the system needs to be kept running for further determination.

[0081] Since there is a temperature difference between indoor and outdoor before the water pump is running, there is also a temperature difference between indoor and outdoor in the water system, therefore, when the water pump is running for the first time, it is determined whether MaxΔTwi and MaxΔTwo are less than or equal to the first threshold. If yes, it indicates that the water flow may be too low, resulting in a small change value of the inlet water temperature or outlet water temperature itself. However, at this time, it is possible that the water temperature difference between indoor and outdoor is small before the water pump is running, and the water flow cannot be simply determined to be too low, therefore, the system needs to be further run to determine whether the water flow in the water system is too low according to at least one of the received Twi, Two, Ta and Pd.

[0082] In some embodiments, if MaxΔTwi or MaxΔTwo is greater than the first threshold, that is, the change value of the inlet water temperature value or outlet water temperature value itself is large within the first time, it indicates that there is water flow circulation in the water system, in order to prevent the water flow from being too small or the water pump from being stuck during running, the air conditioning system determines whether the water flow in the water system is too low according to the received Twi, Two and Ta after the water pump is running for the first time.

[0083] As a feasible implementation manner, the step of determining whether the water flow in the water system is too low according to the received Twi, Two and Ta is specifically:

[0084] After the water pump is running for the first time, the first duration in which the difference between Twi and Two is greater than or equal to the second threshold is counted, and the second duration in which the difference between Two and Twi is greater than or equal to f (Ta, Twi (0)) is counted.

[0085] If the first duration or the second duration is equal to the preset time, it is determined that the water flow in the water system is too low.

[0086] Wherein, f (Ta, Twi (0)) is related to Ta and Twi (0).

[0087] In the embodiments of the present application, the second threshold and the preset time are preset by the system, and in actual application, the second threshold and the preset time can be set according to requirements. For example, as a feasible implementation manner, the second threshold can be 10℃, and the preset time can be 5S, if Twi-Two≥

[0088] 10℃, or the duration of Two-Twi≥f(ta, Twi(0)) is equal to 5S, it is determined that the water flow is too low.

[0089] Wherein, f(ta, Twi(0)) is a function related to Ta and Twi(0) preset by the system, Twi(0) is the Twi detected before the water pump runs, in the actual application process, f(ta, Twi(0)) can be set according to the needs, and the embodiments of the application do not make any limitation on this. For example, as a feasible implementation manner, f(ta, Twi(0)) is min(14, Ta / 5, 50 / Twi(0)).

[0090] In the running process of the air conditioning system, the refrigerant in the water-fluorine heat exchanger 5 exchanges heat with water, and the heat carried by the refrigerant is transferred to the water. If the water flow is normal, the Two at the outlet of the water-fluorine heat exchanger 5 should be higher than the Twi at the inlet. If the difference between Twi and Two is greater than or equal to the second threshold value, that is, the Twi at the inlet is higher than the Two at the outlet by the second threshold value, it indicates that the water flow is too low. In order to ensure the accuracy of the judgment, in the case that the duration of the difference between Twi and Two being greater than or equal to the second threshold value exceeds the preset time, it is determined that the water flow in the water system is too low.

[0091] In the running process of the air conditioning system, the Two at the outlet of the water-fluorine heat exchanger 5 should be higher than the Twi at the inlet. However, if the water flow in the water system is normal, after the water pump runs for the first time, the difference between Two and Twi should be within a certain range. If the difference between Two and Twi is greater than or equal to f(Ta, Twi(0)), that is, the Two at the outlet is higher than the Twi at the inlet by a certain value, it indicates that the water flow is too low. In order to ensure the accuracy of the judgment, in the case that the duration of the difference between Two and Twi being greater than or equal to f(Ta, Twi(0)) exceeds the preset time, it is determined that the water flow in the water system is too low.

[0092] In some embodiments, if it is determined that MaxΔTwi and MaxΔTwo are less than or equal to the first threshold value, it indicates that the water flow may be too low, resulting in a small change value of the inlet water temperature or the outlet water temperature itself. However, at this time, it is possible that the water temperature difference between indoor and outdoor is small before the water pump runs, and it cannot be simply determined that the water flow is too low, so it is necessary to determine whether the water flow in the water system is too low according to at least one of the received Twi, Two, Ta and Pd in the target time period [the second time of the compressor running, the third time of the water pump running].

[0093] As a feasible implementation manner, the step of determining whether the water flow in the water system is too low according to at least one of the received Twi, Two, Ta and Pd by the controller comprises:

[0094] determining whether ΔTwi is greater than a second threshold value and whether Pd is greater than or equal to f(Ta, Twi), ΔTwi being a difference between Twi and Twi(0), and f(Ta, Twi) being a function related to Ta and Twi;

[0095] If the difference between Twi and Twi(0) is greater than the second threshold value and Pd is greater than or equal to f(Ta, Twi), it is determined that the water flow in the water system is too low.

[0096] wherein f(Ta, Twi) is a function related to Ta and Twi preset by the system, which can be set according to requirements in actual application, and the embodiments of the present application do not make any limitation thereon. For example, as a feasible implementation manner, f(Ta, Twi) is min(2.5, 2.5+Ta / 20, 2.5+(Twi-25) / 15).

[0097] In the target time period, i.e. after the compressor runs for the second time and the water pump runs for the third time, if the difference between Twi and Twi(0) is greater than the second threshold value, it indicates that the heat in the water system is not fully utilized, and the water flow in the pipeline can be lower than the minimum flow rate required to ensure the normal operation of the water system, i.e. the water flow in the water system can be too low. In order to increase the accuracy of the judgment, the change of the system discharge pressure is used for judgment. If Pd is greater than or equal to f(Ta, Twi), it indicates that the gaseous proportion of the refrigerant is large, and the heat exchange between the refrigerant and the water flow in the water-fluorine heat exchanger 5 is not fully performed, and thus it can be determined that the water flow in the water system is too low.

[0098] As another feasible implementation manner, the step of determining whether the water flow in the water system is too low according to at least one of the received Twi, Two, Ta and Pd comprises:

[0099] determining whether ΔTwo is greater than a third threshold value and whether Pd is greater than or equal to f(Ta, Two).

[0100] If it is determined that the difference between Two and Two(0) is greater than the third threshold value and Pd is greater than or equal to f(Ta, Two), it is determined that the water flow in the water system is too low.

[0101] wherein ΔTwo is the difference between Two and Two(0), Two(0) is the detected Two before the water pump runs, and f(Ta, Two) is a function related to Ta and Two preset by the system, which can be set according to requirements in actual application, and the embodiments of the present application do not make any limitation thereon. For example, as a feasible implementation manner, f(Ta, Two) is min(2.5, 2.5+Ta / 20, 2.5+(Two-25) / 15).

[0102] In the embodiment of the present application, the third threshold is pre-set by the system, and in the actual application process, the third threshold can be set according to the demand. It should be understood that, since in the running process, the temperature of the outlet of the water-fluorine heat exchanger 5 should be greater than the temperature of the inlet, the third threshold set for the outlet water temperature value Two should be greater than the second threshold set for the inlet water temperature value Twi.

[0103] In the target time period, that is, after the compressor runs for the second time, the water pump runs for the third time, if the difference between Two and Two(0) is greater than the third threshold, it indicates that the heat in the water system has not been fully utilized in the room, and the water flow in the pipeline can be lower than the expected minimum flow, that is, the water flow in the water system can be too low. In order to improve the accuracy of the judgment, the change of the system discharge pressure is used for judgment. If Pd is greater than or equal to f(Ta, Two), it indicates that the gas state of the refrigerant accounts for a large proportion, causing the discharge pressure value to be too high, and the heat exchange between the refrigerant and the water flow in the water-fluorine heat exchanger 5 has not been fully carried out, and then it can be determined that the water flow in the water system is too low.

[0104] As another possible implementation manner, the step of determining whether the water flow in the water system is too low according to at least one of the received Twi, Two, Ta and Pd includes:

[0105] determining whether ΔTwi is greater than a fourth threshold, or determining whether ΔTwo is greater than a fifth threshold;

[0106] If it is determined that ΔTwi is greater than the fourth threshold or ΔTwo is greater than the fifth threshold, it is determined that the water flow in the water system is too low.

[0107] In the embodiment of the present application, the fourth threshold is pre-set by the system, and in the actual application process, the fourth threshold can be set according to the demand. Among them, the fourth threshold is greater than the third threshold.

[0108] In the embodiment of the present application, the fifth threshold is pre-set by the system, and in the actual application process, the fifth threshold can be set according to the demand. It should be understood that, since in the running process, the temperature of the outlet of the water-fluorine heat exchanger 5 should be greater than the temperature of the inlet, the fifth threshold set for the outlet water temperature value Two should be greater than the fourth threshold set for the inlet water temperature value Twi.

[0109] In the target time period, that is, after the compressor runs for the second time, the water pump runs for the third time, if any of the following conditions occurs: ΔTwi is greater than the fourth threshold or ΔTwo is greater than the fifth threshold, it indicates that the heat in the water system is very small, that is, the water flow in the pipeline is far lower than the minimum flow to ensure the normal operation of the system, and it can be directly determined that the water flow in the water system is too low.

[0110] In some embodiments, please refer to Figure 3The step of determining whether the water flow in the water system is too low by the air conditioning system comprises:

[0111] S301, determining whether Max(ΔTwi)≤a and Max(ΔTwo)≤a during the first time of water pump operation. If yes, executing S302; if no, executing S303.

[0112] During the first time of water pump operation, firstly, determining whether the change value of the inlet water temperature value or the outlet water temperature value is less than or equal to the first threshold value a. If yes, it indicates that the change value of the inlet water temperature value and the outlet water temperature value are both less than or equal to the first threshold value a, and thus the water flow cannot be simply determined to be problematic. At this time, it is possible that the water temperature difference between the indoor and outdoor is small before the water pump is operated, and thus it is necessary to further operate and determine according to the change of the water temperature.

[0113] If the change value is greater than the first threshold value a, it indicates that there is water flow circulation between the indoor and outdoor, and thus S303 is executed to continue to determine in order to prevent the water flow from being too small or stuck during the operation.

[0114] S302, determining whether Twi-Twi(0)>b and Pd≥f(ta,Twi), or, Two-Two(0)>c and Pd≥f(ta,Two), or, Twi-Twi(0)>d, or, Two-Two(0)>e are established during the target time period. If yes, it is determined that the water flow in the water system is too low; if no, executing S303.

[0115] It should be understood that b, c, d, and e are respectively the second threshold value, the third threshold value, the fourth threshold value, and the fifth threshold value set.

[0116] During the target time period, i.e., after the second time of compressor operation and the third time of water pump operation, the system has been operated for a period of time and has a certain heating capacity, and thus according to the change of the outlet water temperature value or the inlet water temperature value itself and the change of the discharge pressure value, it is determined whether the water flow in the water system is too low.

[0117] If one of the four conditions of Twi-Twi(0)>b and Pd≥f(ta,Twi), Two-Two(0)>c and Pd≥f(ta,Two), Twi-Twi(0)>d, and Two-Two(0)>e is established, it is determined that the water flow in the water system is too low. If none of the four conditions is established, S303 is executed to continue to determine in order to prevent the water flow from being too small or stuck during the operation.

[0118] S303, counting the duration t1 of Twi-Two≥b and the duration t2 of Two-Twi≥f(ta,Twi(0)).

[0119] S304, determining whether t1 or t2 is equal to the preset time.

[0120] If yes, it is determined that the water flow in the water system is too low; if no, it is returned to perform S303.

[0121] During the operation of the air conditioner, the Tw2 at the outlet of the water-fluorine heat exchanger 5 should be higher than the Twi at the inlet. If the difference between the Twi and the Tw2 is greater than or equal to the second threshold value, that is, the Twi at the inlet is higher than the Tw2 at the outlet by the second threshold value, it indicates that the water flow is too low. In order to ensure the accuracy of the judgment, in the case where the duration of the difference between the Twi and the Tw2 being greater than or equal to the second threshold value exceeds the preset time, it is determined that the water flow in the water system is too low.

[0122] If the duration of the difference between the Tw2 and the Twi being greater than or equal to f(Ta, Twi(0)) exceeds the preset time, it is determined that the water flow in the water system is too low.

[0123] In other embodiments, a first temperature sensor is arranged on the water-fluorine heat exchanger 5 to detect the water flow temperature value Tw; a second temperature sensor is arranged on the outdoor heat exchanger 4 to obtain the ambient temperature value Ta; a pressure sensor is arranged on the compressor to obtain the discharge pressure value Pd; and the controller is configured to:

[0124] determine whether the water flow in the water system is too low according to the received Tw, Ta and Pd.

[0125] The air conditioning system provided by the embodiments of the present application determines whether the water flow in the water system is too low through the water flow temperature value Tw, the ambient temperature value Ta and the discharge pressure value Pd, without the need to increase the water flow switch in the water system and without the need to use a water pump with flow feedback to detect the water flow condition. The air conditioning system provided by the embodiments of the present application determines the water flow condition according to the temperature value detected by the temperature sensor and the discharge pressure value, which can accurately determine the water flow condition while not needing to consider the installation direction of the water flow switch, the length of the straight pipe section of the water pipe and the installation space when designing the water system of the air conditioning system, greatly reducing the material cost and labor cost and bringing better user experience.

[0126] Since there is a temperature difference between the indoor and outdoor before the water pump operates, there is also a temperature difference between the indoor and outdoor water in the water system pipeline. Therefore, within the first time of the operation of the water pump, the change value of the water flow temperature value itself is determined. If the change value is large, it indicates that there is water flow circulation in the pipeline of the water system. If the change value is small, it cannot be simply determined that the water flow is problematic. At this time, it is possible that the water temperature difference between the indoor and outdoor is small before the water pump operates, and therefore further operation is needed to determine according to the change of the water temperature.

[0127] As a feasible implementation manner, the step of determining whether the water flow in the water system is too low according to the received Tw, Ta and Pd includes:

[0128] determining whether MaxΔTw is less than or equal to a first threshold value when the water pump is running for a first time;

[0129] MaxΔTw is a difference between a maximum value and a minimum value of Tw detected in the first time;

[0130] If it is determined that MaxΔTw is less than or equal to the first threshold value, it is determined whether the water flow in the water system is too low according to at least one of Tw, Ta and Pd received in a target time period [the compressor is running for a second time, and the water pump is running for a third time].

[0131] wherein the second time is greater than the first time, and the third time is greater than the second time.

[0132] Since there is a temperature difference between the indoor and outdoor before the water pump is running, the water temperature in the outdoor part of the water system and the water temperature in the indoor part have a temperature difference, so it is determined whether MaxΔTw is less than or equal to the first threshold value when the water pump is running for the first time. If so, it indicates that the water flow may be too low, resulting in a smaller change value of the inlet water temperature or outlet water temperature itself. However, at this time, it is possible that the water temperature difference between the indoor and outdoor is small before the water pump is running, and it cannot be simply determined that the water flow is too low. Therefore, the system needs to be further operated, and it is determined whether the water flow in the water system is too low according to at least one of Tw, Ta and Pd received in the target time period.

[0133] As a feasible implementation manner, the step of determining whether the water flow in the water system is too low according to at least one of Tw, Ta and Pd includes:

[0134] If the difference between Tw and Tw(0) is greater than a second threshold value, and Pd is greater than or equal to f(Ta, Tw), it is determined that the water flow in the water system is too low, Tw(0) is Tw detected before the water pump is running, and f(Ta, Tw(0)) is related to Ta and Tw(0).

[0135] wherein f(ta, Tw) is a function related to Ta and Tw preset by the system, which can be set according to requirements in the actual application, and the embodiments of the present application do not make any limitation thereon. For example, as a feasible implementation manner, f(ta, Tw) is min(2.5, 2.5+Ta / 20, 2.5+

[0136] (twi-25) / 15).

[0137] If the difference between Tw and Tw(0) is greater than the second threshold value within the target time period, i.e. after the compressor runs for the second time and the water pump runs for the third time, it indicates that the heat in the water system is not fully utilized, and the water flow in the pipeline can be lower than the expected minimum flow, i.e. the water flow in the water system can be too low. In order to increase the accuracy of the judgment, the change of the system exhaust pressure is used for judgment. If Pd is greater than or equal to f(Ta, Tw), it indicates that the gaseous state of the refrigerant accounts for a large proportion, and the heat exchange between the refrigerant and the water flow in the water-fluorine heat exchanger is not fully carried out, and it can be determined that the water flow in the water system is too low.

[0138] As another possible implementation, the step of determining whether the water flow in the water system is too low according to at least one of the received Tw, Ta and Pd includes:

[0139] If the difference between Tw and Tw(0) is greater than the third threshold value, it is determined that the water flow in the water system is too low.

[0140] If the difference between Tw and Tw(0) is greater than the third threshold value within the target time period, i.e. after the compressor runs for the second time and the water pump runs for the third time, it indicates that the heat in the water system is not fully utilized, and the water flow in the pipeline can be lower than the expected minimum flow, i.e. the water flow in the water system can be too low. In order to increase the accuracy of the judgment, the change of the system exhaust pressure is used for judgment. If Pd is greater than or equal to f(Ta, Tw), it indicates that the gaseous state of the refrigerant accounts for a large proportion, and the heat exchange between the refrigerant and the water flow in the water-fluorine heat exchanger is not fully carried out, and it can be determined that the water flow in the water system is too low.

[0141] In some embodiments, the water-fluorine heat exchanger of the air conditioning system is provided with only one temperature sensor, such as Figure 4 As shown in the figure, the step of determining whether the water flow in the water system is too low includes:

[0142] S401, the water pump runs for a first time, and it is determined whether Max(ΔTw)≤a is true.

[0143] If yes, S402 is executed.

[0144] When the water pump runs for the first time, it is first determined whether the change value of the water flow temperature value itself is less than or equal to the first threshold value a. If yes, it indicates that the change value of the water flow temperature value is less than or equal to the first threshold value a, and the water flow cannot be simply determined to be too low. At this time, it is possible that the water temperature difference between the indoor and outdoor is small before the water pump runs, so it is necessary to further run and determine according to the change of the water temperature.

[0145] S402, within the target time period, Tw-Tw(0)>b and Pd≥f(ta, Tw), or, Tw-Tw(0)>c is true.

[0146] If yes, it is determined that the water flow in the water system is too low.

[0147] It should be understood that b and c are the second threshold value and the third threshold value set in sequence.

[0148] In the target time period, i.e. after the compressor runs for the second time, the water pump runs for the third time, at this time, the system has run for a period of time and has a certain heating capacity, then according to the temperature change of the water flow temperature value and the change of the exhaust pressure value, it is determined whether the water flow in the water system is too low.

[0149] If one of the two conditions Tw-Tw(0)>b and Pd≥f(ta,Tw), Tw-Tw(0)>c exists, it means that the heat in the water system is very little, i.e. the water flow in the pipeline is far below the expected minimum flow, and it can be determined that the water flow in the water system is too low.

[0150] The embodiment of the present application also provides a computer device, which comprises a memory and a processor. The memory and the processor are coupled; the memory is used for storing computer program code, and the computer program code comprises computer instructions. When the processor executes the computer instructions, the computer device executes each step of the method shown in the method embodiment of the present application.

[0151] The embodiment of the present application also provides a computer readable storage medium, which stores computer instructions. When the computer instructions run on an electronic device, the electronic device executes each step of the method shown in the method embodiment of the present application.

[0152] In the embodiment of the present application, a computer program product is also provided, which comprises computer instructions. When the computer instructions run on an electronic device, the electronic device executes each step of the method shown in the method embodiment of the present application.

[0153] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer executes the computer instructions, all or part of the processes or functions according to the embodiments of the present application are generated. The computer can be a general purpose computer, a special purpose computer, a computer network or other programmable device. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through a wired (such as coaxial cable, optical fiber, digital subscriber line (DSL) or wireless (such as infrared, wireless, microwave, etc.)) way. The computer readable storage medium can be any available medium that can be accessed by a computer or include one or more data storage devices such as servers, data centers, etc. that can be integrated with the medium. The available medium can be a magnetic medium (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)) and the like.

[0154] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air conditioning system, characterized by, The air conditioning system comprises a water-fluorine heat exchanger and an outdoor heat exchanger connected by a pipeline, a water pump connected with the water-fluorine heat exchanger to form a water system, and a controller; The controller is connected with the water-fluorine heat exchanger, the outdoor heat exchanger, and the water pump respectively; The water inlet of the water-fluorine heat exchanger is provided with a water inlet temperature sensor for detecting a water inlet temperature value Twi and outputting the Twi to the controller; The water outlet of the water-fluorine heat exchanger is provided with a water outlet temperature sensor for detecting a water outlet temperature value Two and outputting the Two to the controller; The outdoor heat exchanger is provided with a temperature sensor for detecting an ambient temperature value Ta and outputting the Ta to the controller; The controller is configured to: When the water pump runs for a first time, determine whether MaxΔTwi and MaxΔTwo are less than or equal to a first threshold value, the MaxΔTwi being a difference between a maximum value and a minimum value of the Twi detected within the first time, and the MaxΔTwo being a difference between a maximum value and a minimum value of the Two detected within the first time; If it is determined that the MaxΔTwi and the MaxΔTwo are greater than the first threshold value, determine whether the water flow in the water system is too low according to the Twi, the Two, and the Ta; wherein the step of determining whether the water flow in the water system is too low according to the Twi, the Two, and the Ta comprises: After the water pump runs for the first time, count a first duration in which a difference between the Twi and the Two is greater than or equal to a second threshold value, and count a second duration in which a difference between the Two and the Twi is greater than or equal to f(Ta, Twi(0)), the f(Ta, Twi(0)) being related to the Ta and the Twi(0), the Twi(0) being the Twi detected before the water pump runs; If the first duration or the second duration exceeds a preset time, determine that the water flow in the water system is too low.

2. The system of claim 1, wherein, The air conditioning system further comprises a compressor, and the compressor is provided with a pressure sensor for detecting an exhaust pressure value Pd; Before the step of determining whether the water flow in the water system is too low according to the Twi, the Two, and the Ta, the controller is further configured to: If it is determined that the MaxΔTwi and the MaxΔTwo are less than or equal to the first threshold value, determine whether the water flow in the water system is too low according to at least one of the Twi, the Two, the Ta, and the Pd within a target time period, wherein the target time period is within a third time in which the water pump runs after a second time in which the compressor runs, the second time being greater than the first time, and the third time being greater than the second time.

3. The system of claim 2, wherein the step of determining whether the water flow in the water system is too low according to at least one of the Twi, the Two, the Ta, and the Pd comprises: determining whether ΔTwi is greater than a second threshold value and whether Pd is greater than or equal to min(2.5, 2.5+Ta / 20, 2.5+(Twi-25) / 15), the ΔTwi being a difference between the Twi and Twi(0); if the difference between the Twi and Twi(0) is greater than the second threshold value and the Pd is greater than or equal to the min(2.5, 2.5+Ta / 20, 2.5+(Twi-25) / 15), it is determined that the water flow in the water system is too low.

4. The system of claim 2, wherein, The step of determining whether the water flow in the water system is too low according to at least one of the Twi, the Two, the Ta, and the Pd comprises: determining whether ΔTwo is greater than a third threshold value and whether Pd is greater than or equal to min(2.5, 2.5+Ta / 20, 2.5+(Two-25) / 15), the ΔTwo being a difference between the Two and Two(0), the Two(0) being the Two detected before the water pump is operated; if it is determined that the difference between the Two and Two(0) is greater than the third threshold value and the Pd is greater than or equal to the min(2.5, 2.5+Ta / 20, 2.5+(Two-25) / 15), it is determined that the water flow in the water system is too low.

5. The system of claim 2, wherein, The step of determining whether the water flow in the water system is too low according to at least one of the Twi, the Two, the Ta, and the Pd comprises: determining whether ΔTwi is greater than a fourth threshold value or determining whether ΔTwo is greater than a fifth threshold value; if it is determined that the ΔTwi is greater than the fourth threshold value or the ΔTwo is greater than the fifth threshold value, it is determined that the water flow in the water system is too low.

6. An air conditioning system characterized by comprising: The air conditioning system comprises a water-fluorine heat exchanger, an outdoor heat exchanger, a compressor, a water pump, and a controller; The water-fluorine heat exchanger, the outdoor heat exchanger, and the compressor are connected through pipelines; The water pump is connected with the water-fluorine heat exchanger to form a water system; The controller is connected with the compressor, the water-fluorine heat exchanger, the water pump, and the outdoor heat exchanger respectively; A first temperature sensor is arranged on the water-fluorine heat exchanger to obtain a water flow temperature value Tw and output the Tw to the controller; A second temperature sensor is arranged on the outdoor heat exchanger to obtain an ambient temperature value Ta and output the Ta to the controller; A pressure sensor is arranged on the compressor to obtain an exhaust pressure value Pd and output the Pd to the controller; The controller is configured to: determine whether the water flow in the water system is too low according to the Tw, the Ta, and the Pd; wherein the step of determining whether the water flow in the water system is too low according to the Tw, the Ta, and the Pd comprises: when the water pump is operated for a first time, determining whether MaxΔTw is less than or equal to a first threshold value, the MaxΔTw being a difference between a maximum value and a minimum value of the Tw detected within the first time; If it is determined that the MaxΔTw is less than or equal to a first threshold, then it is determined whether water flow in the water system is too low based on at least one of the Tw, the Ta, and the Pd within a target time period, the target time period being after the compressor has run for a second time, the water pump has run for a third time, the second time being greater than the first time, and the third time being greater than the second time.

7. The system of claim 6, wherein, The step of determining whether water flow in the water system is too low based on at least one of the Tw, the Ta, and the Pd includes: If the difference between the Tw and a Tw(0) is greater than a second threshold, and the Pd is greater than or equal to min(2.5, 2.5 + Ta / 20, 2.5 + (Twi-25) / 15), then it is determined that water flow in the water system is too low, the Tw(0) being the Tw detected before the water pump has run.

8. The system of claim 6, wherein, The step of determining whether water flow in the water system is too low based on at least one of the Tw, the Ta, and the Pd includes: If the difference between the Tw and the Tw(0) is greater than a third threshold, then it is determined that water flow in the water system is too low.

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