An air conditioning system automatically regulating a water pump and a control method thereof

Abstract

The application provides a control method for a water pump in an air conditioning system, the air conditioning system comprising a control device, the control method comprising the following steps: (1) adjusting the air conditioning system to enter a normal operation stage; (2) obtaining total rated water flow of N end water valves of the air conditioning system; (3) setting a target water flow according to the total rated water flow; (4) obtaining a current water flow of the water pump; (5) adjusting the rotating speed of the water pump according to the size relationship between the target water flow and the current water flow obtained in step (4). The control method of the application calculates the total water flow required by the system according to the rated water flow of the valve in the open state of the indoor end, sets the target water flow according to the calculated total water flow, adjusts the rotating speed of the water pump by comparing the set target water flow with the current actual water flow, and realizes accurate control of the water flow of the system while making the water system in the most energy-saving state.

Description

TECHNICAL FIELD

[0001] The present application relates to an air conditioning system, in particular to a system and control method for automatically adjusting a water pump in the air conditioning system.

[0002] BACKGROUND

[0003] At present, a cold water (heat pump) air conditioning system adopts an air conditioning and floor heating integrated design. The indoor side mainly adopts a fan coil refrigeration and a buried pipe or radiator heating form. The outdoor side host generates cold and hot water through a variable frequency water pump, and transmits the cold and hot water to the indoor side heat exchanger (such as an indoor side fan coil or floor heating pipe) through a transmission pipeline to exchange heat with indoor air to achieve the purpose of indoor air temperature and humidity regulation. SUMMARY

[0004] In the prior art, the variable frequency water pump usually has the following control methods: the first kind is to increase pressure sensors before and after the variable frequency water pump to control by using a pressure difference; the second kind is to control by using a temperature difference between inlet and outlet water of the host; and the third kind is to control by using a temperature difference between indoor temperature and a set temperature. The first kind of pressure difference control method is divided into variable flow variable lift and constant lift variable flow, wherein the variable flow variable lift is a relatively ideal control method, but this method needs to additionally increase corresponding pressure sensors in the system; the second and third kinds of control methods are not accurate enough, that is, cannot meet the real needs of the air conditioning water system or hydraulic balance.

[0005] In order to make up for the above defects, the present application provides a variable frequency water pump with flow feedback function controlled by using a state of an indoor terminal valve. A host control device judges an opening and closing state of the indoor terminal valve, calculates total water flow required by the air conditioning system according to a rated water flow of the corresponding terminal valve, sets a target water flow according to the calculated total water flow, adjusts a rotating speed of the water pump by comparing the set target water flow with a current actual water flow, so that the working point of the variable frequency water pump is adapted to the correct water flow of the indoor terminal valve, thereby realizing accurate control of system water flow and making the water system in the most energy-saving state.

[0006] Therefore, according to a first aspect of the present application, a control method for a water pump in an air conditioning system is provided, the air conditioning system comprising a control device, the control method comprising the following steps: S01, adjusting the air conditioning system to enter a normal running phase; S02, obtaining total rated water flow of N terminal water valves of the air conditioning system; S03, setting a target water flow according to the total rated water flow; S04, obtaining a current water flow of the water pump; S05, adjusting a rotating speed of the water pump according to a size relationship between the target water flow and the current water flow obtained in the step S04.

[0007] According to a first aspect of the present application, the step S01 of adjusting the air conditioning system into a normal operation stage comprises selecting an operation mode of the air conditioning system.

[0008] According to a first aspect of the present application, the operation mode comprises a heating mode and a cooling mode.

[0009] According to a first aspect of the present application, in the heating mode, after the air conditioning system enters the normal operation stage, it is determined in real time whether the air conditioning system enters a defrosting mode, if the air conditioning system enters the defrosting mode, the rotation speed of the water pump is adjusted to the highest rotation speed; if the air conditioning system does not enter the defrosting mode, the operation of the heating mode is maintained.

[0010] According to a first aspect of the present application, the step S01 of adjusting the air conditioning system into a normal operation stage comprises obtaining an initial current water flow of the water pump, a compressor operation rate and a minimum water flow allowed by the air conditioning system.

[0011] According to a first aspect of the present application, the step S01 of adjusting the air conditioning system into a normal operation stage further comprises adjusting the rotation speed of the water pump according to the size relationship between the initial current water flow of the water pump and the minimum water flow allowed by the air conditioning system.

[0012] According to a first aspect of the present application, in the cooling mode, the step S01 of adjusting the air conditioning system into a normal operation stage further comprises obtaining a unit outlet water temperature of the air conditioning system, so as to determine a cooling low evaporation temperature water flow of the air conditioning system.

[0013] According to a first aspect of the present application, the step S01 of adjusting the air conditioning system into a normal operation stage further comprises adjusting the rotation speed of the water pump according to the size relationship between the initial current water flow of the water pump and the cooling low evaporation temperature water flow of the air conditioning system.

[0014] According to a first aspect of the present application, the step S03 of setting a target water flow according to the total rated water flow comprises determining whether the total rated water flow is zero.

[0015] According to the first aspect of the present application, if the total rated water flow is not zero, the size relationship between the total rated water flow and the minimum water flow allowed by the air conditioning system is determined, and if the total rated water flow is greater than the minimum water flow allowed by the air conditioning system, the size of the target water flow is set to the total rated water flow; if the total rated water flow is not greater than the minimum water flow allowed by the air conditioning system and the air conditioning system is operating in the heating mode, the size of the target water flow is set to the minimum water flow allowed by the air conditioning system.

[0016] According to the first aspect of the present application, in the cooling mode, the setting of the target water flow according to the total rated water flow in the S03 further includes determining the size relationship between the total rated water flow and the cooling low-evaporation-temperature water flow of the air conditioning system, and if the total rated water flow is greater than the minimum water flow allowed by the air conditioning system and the total rated water flow is greater than the cooling low-evaporation-temperature water flow of the air conditioning system, the size of the target water flow is set to the total rated water flow; if the total rated water flow is not greater than the minimum water flow allowed by the air conditioning system or the total rated water flow is not greater than the cooling low-evaporation-temperature water flow of the air conditioning system, the size of the target water flow is set to the greater value between the minimum water flow allowed by the air conditioning system and the cooling low-evaporation-temperature water flow of the air conditioning system.

[0017] According to the first aspect of the present application, if the total rated water flow is zero, it is determined whether the compressor operation rate is zero, if the compressor operation rate is not zero and the air conditioning system is operating in the heating mode, the size of the target water flow is set to the minimum water flow allowed by the air conditioning system; if the compressor operation rate is not zero and the air conditioning system is operating in the cooling mode, the size of the target water flow is set to the greater value between the minimum water flow allowed by the air conditioning system and the cooling low-evaporation-temperature water flow of the air conditioning system; if the compressor operation rate is zero, the water pump is operated in a shutdown mode, and no start command is sent to the compressor of the air conditioning system during the shutdown stage of the water pump.

[0018] According to the first aspect of the present application, in the heating mode, it is determined whether the air conditioning system terminal contains a floor heating mode after the water pump is stopped. If the air conditioning system terminal contains a floor heating mode, it is determined whether the water pump shutdown time exceeds a preset time. If the water pump shutdown time exceeds the preset time, the water pump is started, the size of the target water flow is set to the minimum water flow allowed by the air conditioning system, and the restriction of not sending a start command to the compressor is removed. If the water pump shutdown time does not exceed the preset time, the water pump remains in the stopped state. If the terminal water valve does not contain a floor heating mode, return to step S02.

[0019] According to the first aspect of the present application, in step S05, if the target water flow is greater than the current water flow obtained in step S04, the speed of the water pump is increased. If the target water flow is less than the current water flow obtained in step S04, the speed of the water pump is decreased. If the target water flow is equal to the current water flow obtained in step S04, the speed of the water pump remains unchanged.

[0020] According to the first aspect of the present application, after the operation of step S05 is completed, return to step S02.

[0021] According to the first aspect of the present application, in step S02, obtaining the total rated water flow includes obtaining the rated water flow of the N terminal water valves in the open state.

[0022] According to the second aspect of the present application, an air conditioning system is provided, including N air conditioning units, characterized in that the air conditioning system includes a water pump, N water valves and a control device. Each of the N air conditioning units includes one of the N water valves, and one of the N water valves is configured to control the opening and closing of the water path of the air conditioning unit. The control device is configured to obtain the total rated water flow of the N air conditioning units by receiving the opening and closing signals of the N water valves, and set the target water flow of the water pump according to the total rated water flow. The control device is also configured to obtain the current water flow of the water pump, and adjust the speed of the water pump according to the size relationship between the target water flow and the current water flow.

[0023] According to a second aspect of the present application, the air conditioning system further comprises N air-cooling units, a water pipe and / or N floor heating units; each of the N air-cooling units comprises one of the N air-cooling units; the water pipe connects the water pump and the N air-cooling units, so that a water flow loop is formed between the water pump and the N air-cooling units, thereby each of the N air-cooling units is capable of exchanging heat with a corresponding one of the N rooms; each of the N air-cooling units comprises one of the N floor heating units, wherein the water pipe connects the water pump and the N floor heating units, so that a water flow loop is formed between the water pump and the N floor heating units, thereby each of the N floor heating units is capable of exchanging heat with a corresponding one of the N rooms.

[0024] According to a third aspect of the present application, there is provided an air conditioning system comprising a water pump and a control device, wherein the control device is configured to adjust the rotation speed of the water pump by the control method according to the first aspect of the present application.

[0025] The idea, specific structure and technical effects of the present application will be further described below with reference to the accompanying drawings, so as to fully understand the purpose, features and effects of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] These and other features and advantages of the present application can be better understood by reading the following detailed description, taken in conjunction with the accompanying drawings, in which:

[0027] FIG. 1 is a schematic diagram of the air conditioning system 100 of the present application;

[0028] FIG. 2 is a control flow chart of the working mode of the air conditioning system 100 of the present application;

[0029] FIGS. 3A-3C is a control flow chart of the adjustment of the water pump 124 in the cooling mode of the air conditioning system 100 of the present application;

[0030] FIGS. 4A-4C is a control flow chart of the adjustment of the water pump 124 in the heating mode of the air conditioning system 100 of the present application;

[0031] FIG. 5 is a control flow chart of the adjustment of the water pump 124 in the defrosting mode of the air conditioning system 100 of the present application;

[0032] FIG. 6 is a block diagram of the control device 150 of the air conditioning system of the present application, showing the specific components and connection relationship of the control device 150. DETAILED DESCRIPTION

[0033] The specific embodiments of the present application will now be described with reference to the drawings of the specification. It is to be understood that the same or similar reference numerals used throughout the present application refer to the same or similar parts.

[0034] The air conditioning system of the present application is suitable for working in various modes, including but not limited to cooling mode (target set temperature is lower than ambient temperature), heating mode (target set temperature is higher than ambient temperature) and defrosting mode (whether to run in heating mode is selected).

[0035] FIG. 1 A schematic diagram of the air conditioning system 100 of the present application is shown to illustrate the main working modules of the air conditioning system 100 of the present application.

[0036] As shown in FIG. 1 The air conditioning system 100 of the present application includes N air conditioning units 101, 102, …, 10N (for example, the N air conditioning units can be N rooms, that is, each air conditioning unit corresponds to a room), a unit 122 (for example, it can be a cold water or heat pump unit arranged outside the N rooms), a control device 150 and water pipes 132, 134 (including an inlet water pipe 134 and an outlet water pipe 132), wherein the unit 122 includes a water pump 124 and a compressor 126. The water pump 124 can be fluidly connected with the water pipes 132, 134 to transmit cold or hot water through the water pipes 132, 134 to the indoor side heat exchanger to exchange heat with the indoor air to adjust the temperature and humidity of the indoor air. The water pump 124 has a flow feedback function, which can feed back the current water flow of the water pump 124 to the control device 150. The suction port and the exhaust port (not shown) of the compressor 126 are respectively connected with the refrigerant circulation pipelines (suction pipeline 127 and exhaust pipeline 128) to complete the circulation flow of the refrigerant.

[0037] The water pipes 132, 134 are fluidly connected with the unit 122 and pass through the N air conditioning units 101, 102, …, 10N, so that the water in the water pipes can controllably and in parallel flow through the N air conditioning units. Since the water pipes 132, 134 fluidly connect the unit 122 and the N air conditioning units and form a parallel water flow circuit, each of the N air conditioning units 101, 102, …, 10N contains a corresponding section of the water pipes, which has an inlet water side section 161, 162, …, 16N and an outlet water side section 171, 172, …, 17N, wherein the inlet water side section 161, 162, …, 16N is used to transmit cold or hot water to the indoor side heat exchanger, and the outlet water side section 171, 172, …, 17N is used to deliver the water after heat exchange in the indoor side heat exchanger back to the unit 122. A water temperature sensor 129 is arranged at the position of the unit 122 close to the outlet water pipe 132, which can detect the outlet water temperature of the unit 122 in the cooling mode and feed back the detected outlet water temperature to the control device 150.

[0038] Each of the N air conditioning units 101, 102,..., 10N further comprises a user control device 151, 152,..., 15N and a water valve 181, 182,..., 18N corresponding thereto. The water valve 181, 182,..., 18N can be used to control the opening and closing of the water path of the respective air conditioning unit 101, 102,..., 10N, and the end user can control the opening and closing of the respective air conditioning unit 101, 102,..., 10N and the working mode of the air conditioning system through the user control device 151, 152,..., 15N. The opening of each of the N air conditioning units 101, 102,..., 10N corresponds to the opening of the corresponding water valve 181, 182,..., 18N; similarly, the closing of each of the N air conditioning units 101, 102,..., 10N corresponds to the closing of the corresponding water valve 181, 182,..., 18N.

[0039] Each of the N air conditioning units 101, 102,..., 10N of the air conditioning system 100 further comprises a fan coil 191, 192,..., 19N corresponding thereto. The water pipe 132, 134 is fluidly connected to the water pump 124 and the N fan coils 191, 192,..., 19N, so that a water flow loop is formed between the water pump 124 and the N fan coils 191, 192,..., 19N, thereby each of the N fan coils 191, 192,..., 19N can exchange heat with the corresponding one of the N air conditioning units. In some other embodiments, each of the N air conditioning units further comprises a floor heating (not shown in the figure) in the heating mode. Similar to the connection of the fan coil 191, 192,..., 19N, the water pipe 132, 134 is fluidly connected to the water pump 124 and the N floor heating, so that a water flow loop is formed between the water pump 124 and the N floor heating, thereby each of the N floor heating can exchange heat with the corresponding one of the N air conditioning units. The user control device 151, 152,..., 15N is electrically connected to the fan coil 191, 192,..., 19N and / or the floor heating and the water valve 181, 182,..., 18N through the connection line 141, 142,..., 14N, so that the user control device 151, 152,..., 15N can control the opening and closing of the water valve 181, 182,..., 18N, the fan coil 191, 192,..., 19N and / or the floor heating by receiving the input of the end user. In each of the air conditioning units 101, 102,..., 10N, the fan coil 191, 192,..., 19N and / or the floor heating is connected in series with the corresponding water valve 181, 182,..., 18N in the water path, so that the opening and closing of the water valve 181, 182,..., 18N can control whether the cold or hot water flows through the fan coil 191, 192,..., 19N and / or the floor heating.

[0040] The control device 150 is electrically connected with the user control devices 151, 152, …, 15N through the connection lines 111, 112, …, 11N to receive the opening and closing signals of the N water valves 181, 182, …, 18N and the working mode signals of the N air conditioning units 101, 102, …, 10N; the control device 150 is also electrically connected with the unit 122 through the connection line 110 to receive the current flow parameter, the current rotating speed parameter and the current water temperature parameter of the water pump 124, and can adjust the rotating speed of the water pump 124 according to the received parameters. Therefore, the control device 150 can collect the rated water flow Q on_n of the water valve 181, 182, …, 18N at the end of the water valve in the open state from the N air conditioning units 101, 102, …, 10N on_n , calculate the total rated water flow Q total of the water valve in the open state, and set the target water flow Q total of the water pump 124 according to the total rated water flow Q target , adjust the rotating speed of the water pump 124 according to the size relationship between the target water flow Q target and the current water flow Q f , so as to control the flow of the water pump 124 in the unit 122.

[0041] Those skilled in the art should understand that the user control devices 151, 152, …, 15N can also be connected with the water valves 181, 182, …, 18N, the air diffusers 191, 192, …, 19N and / or the floor heating through wireless connection to remotely control the opening and closing of the water valves 181, 182, …, 18N, the air diffusers 191, 192, …, 19N and / or the floor heating; the control device 150 can also be connected with the user control devices 151, 152, …, 15N and the unit 122 through wireless connection to remotely receive the opening and closing signals of the N water valves 181, 182, …, 18N and the working mode signals of the N air conditioning units 101, 102, …, 10N, the current flow parameter, the current rotating speed parameter and the current water temperature parameter of the water pump 124, and remotely control and adjust the rotating speed of the water pump 124.

[0042] FIG. 2 is a control flow chart of the working mode of the air conditioning system of the present application, which shows the selection process of different working modes of the air conditioning system 100.

[0043] When selecting the working mode of the air conditioning system 100, there are two approaches: (1) Only the working mode of the outdoor unit 122 is allowed to be input (i.e., only one general working mode is input, and the working modes of each air conditioning unit 101, 102, ..., 10N will not take effect even if a working mode is input); (2) The working modes of the outdoor unit 122 and the room user control devices 151, 152, ..., 15N are allowed to be input simultaneously. At this time, one of the user control devices 151, 152, ..., 15N will be defined as the main user control device. The user control devices of other rooms cannot set the working mode. The working mode input switching of the outdoor unit 122 and the main user control device can be mutually overridden, that is, the working mode input later overrides the working mode input earlier.

[0044] like FIG. 2 As shown, in step 200, "Start" indicates that the air conditioning system 100 enters the selection process for the operating mode, followed by step 202. In step 202, as described above, the user can input the operating mode of the air conditioning system at the outdoor unit 122 or at a main user control device selected from N air conditioning units 101, 102, ..., 10N. If the user inputs the heating mode, the process proceeds to step 204, and the air conditioning system 100 operates in heating mode; if the user inputs the cooling mode, the process proceeds to step 206, and the air conditioning system 100 operates in cooling mode.

[0045] After step 204 is completed, the process proceeds to step 208. In heating mode, the control device 150 determines whether the air conditioning system 100 is in defrost mode based on the outdoor unit fin temperature. Specifically, defrosting depends on the temperature difference between the temperature sensor on the outdoor unit's finned tube heat exchanger and the outdoor ambient temperature sensor. If the difference is too large, for example, greater than 7 degrees Celsius, it indicates poor heat exchange in the outdoor unit, i.e., frost has formed, requiring defrosting. In defrost mode, if the temperature on the finned tube heat exchanger exceeds the set temperature value, for example, 12 degrees Celsius, it means the tube temperature of the outdoor unit's finned tube heat exchanger is high enough, and there is no frost on the outdoor unit, so the defrost mode is exited. Therefore, in step 208, if the temperature difference between the finned tube heat exchanger and the outdoor ambient temperature is greater than the set value (e.g., 7 degrees Celsius), the process proceeds to step 210, and the air conditioning system 100 operates in defrost mode; if the temperature difference between the finned tube heat exchanger and the outdoor ambient temperature is not greater than the set value (e.g., 7 degrees Celsius), the process returns to step 204, and the air conditioning system 100 continues to operate in heating mode.

[0046] After the operation of step 210 is completed, the flow goes to step 212, and the control device 150 judges whether the air conditioning system 100 exits the defrosting mode according to the temperature of the outdoor unit fin. In step 212, if the temperature on the finned tube heat exchanger is not less than a set value (for example, 12 degrees Celsius), indicating that the tube temperature of the finned tube heat exchanger is high enough, the flow goes back to step 204, and the air conditioning system 100 returns to the heating mode; if the temperature on the finned tube heat exchanger is less than the set value (for example, 12 degrees Celsius), indicating that the tube temperature of the finned tube heat exchanger is not high enough, the flow goes back to step 210, and the air conditioning system 100 remains to run in the defrosting mode.

[0047] The following will introduce the process of adjusting the speed (water flow) of the water pump 124 in the air conditioning system 100 in the cooling mode, the heating mode and the defrosting mode, respectively. FIGS. 3A-3C 、 FIGS. 4A-4C and FIG. 5 The following will introduce the process of adjusting the speed (water flow) of the water pump 124 in the air conditioning system 100 in the cooling mode, the heating mode and the defrosting mode, respectively.

[0048] FIGS. 3A-3C is the control flow chart of the air conditioning system in the cooling mode.

[0049] As shown in FIG. 3A , in step 300, "start" indicates that the air conditioning system 100 enters the water pump adjustment mode, and the unit starts to run, i.e., the process from no compressor running to compressor running. After the unit starts to run, step 302 is entered.

[0050] In step 302, the control device 150 detects that the air conditioning system 100 is currently running in the cooling mode, and then step 304 is entered.

[0051] In step 304, the control device 150 sets the water pump speed to 70%-100% of the highest speed. After the operation of step 304 is completed, the flow goes to step 306.

[0052] In step 306, the unit maintains running at the water pump speed set in step 304 for 2-5 minutes. After the operation of step 306 is completed, the flow goes to step 308.

[0053] In step 308, the control device 150 acquires the initial current water flow Q f0 of the water pump 124 with the flow feedback function, the unit outlet water temperature T0 from the water temperature sensor 129, the compressor operation rate R r and the system allowed minimum water flow Q min . For the unit with multiple fixed-frequency compressors, the compressor operation rate R r is the ratio of the number of currently running compressors to the total number of compressors, and for the unit with variable-frequency compressors, the compressor operation rate R ris the ratio of the current compressor operating frequency to the maximum operating frequency. The system allows a minimum water flow rate Q min is usually set to 20%-60% of the rated water flow rate of the unit, and is determined according to the number and type of compressors in the unit. After the above parameters are obtained, the control device 150 determines the refrigeration low-evaporation-temperature water flow rate Q r based on the compressor operating rate R le and the unit outlet water temperature T0. le The refrigeration low-evaporation-temperature water flow rate Q le represents the water flow rate when the refrigerant evaporation temperature in the evaporator of the air conditioning system is zero. The refrigeration low-evaporation-temperature water flow rate Q le may be fitted by the freezing curve of the evaporator or obtained by querying the values pre-stored in the control device. For example, the reference value of the refrigeration low-evaporation-temperature water flow rate Q f0 may be obtained by Table 1 below, where Q represents the rated water flow rate of the unit (the control device can automatically obtain the model of the outdoor unit to obtain a fixed rated water flow rate).

[0054]

[0055] Table 1

[0056] After the operation of step 308 is completed, the flow proceeds to step 310.

[0057] In step 310, it is determined whether the initial current water flow rate Q f0 of the water pump is less than the refrigeration low-evaporation-temperature water flow rate Q le . If the initial current water flow rate Q f0 of the water pump is less than the refrigeration low-evaporation-temperature water flow rate Q le , it indicates that the initial current water flow rate Q f0 of the water pump is too low, and the flow proceeds to step 312, in which the unit is maintained to operate for an emergency adjustment period T u . Usually, the emergency adjustment period T u is 2-10 seconds. After the operation of step 312 is completed, the flow proceeds to step 314. If the initial current water flow rate Q f0 of the water pump is not less than the refrigeration low-evaporation-temperature water flow rate Q le , the flow proceeds to step 316.

[0058] In step 316, it is determined whether the initial current water flow rate Q f0 of the water pump is less than the system-allowed minimum water flow rate Q min . If the initial current water flow rate Q f0 of the water pump is less than the system-allowed minimum water flow rate Q min , it indicates that the initial current water flow rate Q f0If the water flow rate is too low, the process goes to step 318, and the unit maintains operation for an emergency adjustment period T u After the operation of step 318 is completed, the process goes to step 320.

[0059] In steps 314 and 320, the water pump speed is increased by 5%-20%. After the operation of steps 314 and 320 is completed, the process goes back to step 308, and the control device 150 reacquires the relevant parameters.

[0060] Those skilled in the art should understand that steps 310 and 316 can be executed in reverse order.

[0061] In step 316, if the initial current water flow rate Q f0 of the water pump is not less than the minimum water flow rate Q min allowed by the system, the process goes to step 322. f0 If the initial current water flow rate Q on_n of the water pump meets the minimum operation requirement, the process goes to step 322.

[0062] In step 322, it is determined whether the unit meets the normal operation requirement. Specifically, the normal operation requirement of the unit mainly refers to the normal operation state of the refrigerant (fluorine) system of the outdoor unit, i.e., the refrigerant (fluorine) system of the outdoor unit can operate without failure. If the refrigerant (fluorine) system of the outdoor unit of the unit does not meet the normal operation requirement, the process goes back to step 308, and the control device 150 reacquires the relevant parameters. If the refrigerant (fluorine) system of the outdoor unit of the unit meets the normal operation requirement, the process goes to step 324, and the unit enters the normal operation phase (i.e., the compressor 126 starts to operate and has operated for a period of time).

[0063] In step 324, the control device 150 acquires the rated water flow rate Q on_n of the water valve 181, 182, …, 18N at the end of each water valve in the N air conditioning units 101, 102, …, 10N in the open state, and calculates the total rated water flow rate Q on_n of the water valve ends in the open state according to the acquired rated water flow rate Q total of each water valve end in the open state. After the operation of step 324 is completed, the process goes to step 326.

[0064] In step 326, it is determined whether the total rated water flow rate Q total is greater than zero. If the total rated water flow rate Q total is greater than zero, the process goes to step 328, which will be described in detail below FIG. 3B . If the total rated water flow rate Q total is not greater than zero, i.e., the water valves of each air conditioning unit 101, 102, …, 10N are in the closed state, so that Q total is zero, the process goes to step 350, which will be described in detail below FIG. 3C .

[0065] like FIG. 3B As shown, in step 328, the total fixed water flow rate Q is determined. total Is it greater than the currently detected low evaporation temperature of the cooling water flow rate Q? le It is also greater than the system's minimum allowable water flow rate Q. min If the total fixed water flow rate Q total This is greater than the currently detected low evaporation temperature of the cooling water flow rate Q. le It is also greater than the system's minimum allowable water flow rate Q. min Then the process proceeds to step 330; if the total fixed water flow rate Q total It is not greater than the currently detected low evaporation temperature of the cooling water flow rate Q. le It is also greater than the system's minimum allowable water flow rate Q. min That is, the total fixed water flow rate Q total No greater than the currently detected low evaporation temperature of the cooling water flow rate Q le Or the total fixed water flow rate Q total Not greater than the system's minimum allowable water flow rate Q min To ensure reliable operation of the unit and prevent the evaporator in the refrigeration system from freezing, water pump 124 needs to be kept running, and the process proceeds to step 340.

[0066] In step 330, the system target water flow rate Q is... target Set the total fixed water flow rate Q total After step 330 is completed, the process proceeds to step 332.

[0067] In step 332, the current water flow rate Q of the water pump 124 is detected. f After step 332 is completed, the process proceeds to step 334.

[0068] In step 334, the target water flow rate Q of the system is determined. target With the current water flow rate Q f Are they equal? ​​If the current water flow rate Q of the system is... f Equal to the target water flow rate Q target This indicates that the current water flow rate of the pump meets the system's operating requirements and no adjustment is needed temporarily; the process then proceeds to step 338. If the current water flow rate Q of the system... f Not equal to the target water flow rate Q target If so, the speed of water pump 124 needs to be adjusted, thereby changing the current water flow of water pump 124, and the process then proceeds to step 336.

[0069] In step 336, based on the current water flow rate Q of the system... f With the target water flow rate Q targetThe difference is used to proportionally increase or decrease the speed of water pump 124, with each speed adjustment being 1%-10% of the speed to be adjusted. Specifically, if the current water flow rate Q of the system... f Greater than the target water flow rate Q target Based on the current water flow rate Q of the system f With the target water flow rate Q target The difference is used to proportionally reduce the speed of the water pump Q by 124; if the current water flow rate Q of the system... f Less than the target water flow rate Q target Based on the current water flow rate Q of the system f With the target water flow rate Q target The difference is used to proportionally increase the speed of water pump 124. After step 336 is completed, the process proceeds to step 338.

[0070] In step 338, the unit maintains operation for one normal adjustment cycle T. n Under normal circumstances, a normal adjustment period T n The time is 30-120 seconds. After step 338 is completed, the process returns to step 324 to retrieve the relevant parameters again.

[0071] In step 340, the system target water flow rate Q is... target Set to the currently detected cooling low evaporation temperature water flow rate Q le With the system's minimum allowable water flow rate Q min The larger of the two values ​​is used. After step 340 is completed, the process proceeds to step 342.

[0072] In step 342, the current water flow rate Q of the water pump 124 is detected. f After step 342 is completed, the process proceeds to step 344.

[0073] In step 344, the target water flow rate Q of the system is determined. target With the current water flow rate Q f Are they equal? ​​If the current water flow rate Q of the system is... f Equal to the target water flow rate Q target This indicates that the current water flow rate of the pump meets the system's operating requirements and no adjustment is needed at this time. The process then proceeds to step 348. If the current water flow rate Q of the system... f Not equal to the target water flow rate Q target If so, the speed of water pump 124 needs to be adjusted, thereby changing the current water flow of water pump 124, and the process then proceeds to step 346.

[0074] In step 346, the rotational speed of water pump 124 is increased or decreased by 5%-20%. Specifically, if the current water flow rate Q of the system... f Greater than the target water flow rate Qtarget Reduce the speed of water pump 124 by 5%-20%; if the current water flow rate Q of the system... f Less than the target water flow rate Q target Increase the speed of water pump 124 by 5%-20%. After the operation in step 346 is completed, the process proceeds to step 348.

[0075] In step 348, the unit maintains operation for one emergency adjustment cycle T. u After step 348 is completed, the process returns to step 324 to retrieve the relevant parameters again.

[0076] like FIG. 3C As shown, in step 350, the compressor operating rate R is determined. r Is it greater than zero? If the compressor operating rate R r Not greater than zero, i.e., compressor operating rate R r If the compressor operating rate R is zero, compressor 126 is in the off state, and the process proceeds to step 352; r If the result is greater than zero, the process proceeds to step 354.

[0077] In step 352, the control device 150 sends a stop command to the water pump 124 and does not send a start command to the compressor 126 during the water pump stop phase.

[0078] In step 354, the system target water flow rate Q is... target Set to the currently detected cooling low evaporation temperature water flow rate Q le With the system's minimum allowable water flow rate Q min The larger of the two values ​​is used. After the operation in step 354 is completed, the process proceeds to step 356.

[0079] In step 356, the current water flow rate Q of the water pump 124 is detected. f After step 356 is completed, the process proceeds to step 358.

[0080] In step 358, the target water flow rate Q of the system is determined. target With the current water flow rate Q f Are they equal? ​​If the current water flow rate Q of the system is... f Equal to the target water flow rate Q target This indicates that the current water flow rate of the pump meets the system's operating requirements and no adjustment is needed temporarily; the process then proceeds to step 362. If the current water flow rate Q of the system... f Not equal to the target water flow rate Q target If so, the speed of water pump 124 needs to be adjusted, thereby changing the current water flow of water pump 124, and the process will proceed to step 360.

[0081] In step 360, the rotation speed of the water pump 124 is increased or decreased by 5%-20%. Specifically, if the current water flow Q f of the system is greater than the target water flow Q target , the rotation speed of the water pump 124 is decreased by 5%-20%; if the current water flow Q f of the system is less than the target water flow Q target , the rotation speed of the water pump 124 is increased by 5%-20%. After the operation of step 360 is completed, the flow goes to step 362.

[0082] In step 362, the unit maintains operation for an emergency adjustment period T u . After the operation of step 362 is completed, the flow goes back to step 324 to reacquire the relevant parameters.

[0083] FIGS. 4A-4C is a control flow chart of the air conditioning system of the present application for adjusting the water pump in the heating mode.

[0084] As shown in FIG. 4A , in step 400, "start" indicates that the air conditioning system 100 enters the water pump adjustment mode, and the unit starts operation, i.e., the process from no compressor operation to compressor operation. After the unit starts operation, step 402 is entered.

[0085] In step 402, the control device 150 detects that the air conditioning system 100 is currently operating in the heating mode, and then step 404 is entered.

[0086] In step 404, the control device 150 sets the rotation speed of the water pump to 70%-100% of the highest rotation speed. After the operation of step 404 is completed, the flow goes to step 406.

[0087] In step 406, the unit maintains operation at the water pump rotation speed set in step 404 for 2-5 minutes. After the operation of step 406 is completed, the flow goes to step 408.

[0088] In step 408, the control device 150 acquires the initial current water flow Q f0 of the water pump, the compressor operation rate R r , and the system allowable minimum water flow Q min from the water pump 124 with flow feedback function, wherein the calculation method of the compressor operation rate R r and the system allowable minimum water flow Q min has been described above in the cooling mode of the system, and will not be described here again.

[0089] In step 410, it is determined whether the initial current water flow Q f0 of the water pump is less than the system allowable minimum water flow Q minIf the initial current water flow rate Q f0 of the water pump is less than the system allowed minimum water flow rate Q min , it means that the initial current water flow rate Q f0 of the water pump is too low, and the flow goes to step 412, in which the unit maintains running for an emergency adjustment period T u . After the operation of step 412 is completed, the flow goes to step 414.

[0090] In step 414, the water pump speed is increased by 5%-20%. After the operation of step 414 is completed, the flow goes back to step 408, in which the control device 150 reacquires the relevant parameters.

[0091] In step 410, if the initial current water flow rate Q f0 of the water pump is not less than the system allowed minimum water flow rate Q min , it means that the initial current water flow rate Q f0 of the water pump meets the minimum running requirement, and the flow goes to step 416.

[0092] In step 416, it is judged whether the unit meets the normal running requirement. The normal running requirement of the unit has been introduced in the above-described system refrigeration mode, and will not be described here again. If the unit does not meet the normal running requirement, the flow goes back to step 408, in which the control device 150 reacquires the relevant parameters. If the unit meets the normal running requirement, the flow goes to step 418, in which the unit enters the normal running stage (i.e., the compressor 126 starts running and has run for a period of time).

[0093] In step 418, the control device 150 acquires the rated water flow rates Q on_n of the water valves 181, 182,..., 18N at the ends of the water valves 181, 182,..., 18N in the N air conditioning units 101, 102,..., 10N in the open state, and calculates the total rated water flow rate Q total of the water valves in the open state according to the acquired rated water flow rates Q on_n of the water valves at the ends of the water valves in the open state. After the operation of step 418 is completed, the flow goes to step 420.

[0094] In step 420, it is judged whether the total rated water flow rate Q total is greater than zero. If the total rated water flow rate Q total is greater than zero, the flow goes to step 422, which will be described in detail below FIG. 4B . If the total rated water flow rate Q total is not greater than zero, i.e., the water valves of the N air conditioning units 101, 102,..., 10N are all in the closed state, so that Q total is zero, the flow goes to step 450, which will be described in detail below FIG. 4C .

[0095] IfFIG. 4B In step 422, it is determined whether the total rated water flow Q total is greater than the system allowable minimum water flow Q min If the total rated water flow Q total is greater than the system allowable minimum water flow Q min , the flow goes to step 424; if the total rated water flow Q total is not greater than the system allowable minimum water flow Q min , in order to ensure the reliable operation of the unit, the high pressure protection is performed on the compressor 126, and the water pump 124 needs to be kept in the running state, and the flow goes to step 440.

[0096] In step 424, the system target water flow Q target is set as the total rated water flow Q total , and after the operation of step 424 is completed, the flow goes to step 426.

[0097] In step 426, the current water flow Q f of the water pump 124 is detected, and after the operation of step 426 is completed, the flow goes to step 428.

[0098] In step 428, it is determined whether the system target water flow Q target is equal to the current water flow Q f . If the system current water flow Q f is equal to the target water flow Q target , it indicates that the current water flow of the water pump meets the system operation requirement at this time, and no adjustment is temporarily required, and the flow goes to step 432. If the system current water flow Q f is not equal to the target water flow Q target , the speed of the water pump 124 needs to be adjusted, and then the current water flow of the water pump 124 is changed, and the flow goes to step 430.

[0099] In step 430, according to the difference between the system current water flow Q f and the target water flow Q target , the speed of the water pump 124 is proportionally increased or decreased, and the adjustment amount of the speed of the water pump at each time is 1%-10% of the speed to be adjusted. Specifically, if the system current water flow Q f is greater than the target water flow Q target , according to the difference between the system current water flow Q f and the target water flow Q target , the speed of the water pump 124 is proportionally decreased; if the system current water flow Q f is less than the target water flow Q target , according to the difference between the system current water flow Q f and the target water flow Q targetThe difference is used to proportionally increase the speed of water pump 124. After step 430 is completed, the process proceeds to step 432.

[0100] In step 432, the unit maintains operation for one normal adjustment cycle T. n After step 432 is completed, the process returns to step 418 to retrieve the relevant parameters again.

[0101] In step 440, the system target water flow rate Q is... target Set the system's minimum allowed water flow rate Q min After step 440 is completed, the process proceeds to step 442.

[0102] In step 442, the current water flow rate Q of the water pump 124 is detected. f After step 442 is completed, the process proceeds to step 444.

[0103] In step 444, the target water flow rate Q of the system is determined. target With the current water flow rate Q f Are they equal? ​​If the current water flow rate Q of the system is... f Equal to the target water flow rate Q target This indicates that the current water flow rate of the pump meets the system's operating requirements and no adjustment is needed temporarily; the process then proceeds to step 448. If the current water flow rate Q of the system... f Not equal to the target water flow rate Q target If so, the speed of water pump 124 needs to be adjusted, thereby changing the current water flow of water pump 124, and the process will proceed to step 446.

[0104] In step 446, the rotational speed of water pump 124 is increased or decreased by 5%-20%. Specifically, if the current water flow rate Q of the system... f Greater than the target water flow rate Q target Reduce the speed of water pump 124 by 5%-20%; if the current water flow rate Q of the system... f Less than the target water flow rate Q target Increase the speed of water pump 124 by 5%-20%. After the operation in step 446 is completed, the process proceeds to step 448.

[0105] In step 448, the unit maintains operation for one emergency adjustment cycle T. u After step 448 is completed, the process returns to step 418 to retrieve the relevant parameters again.

[0106] like FIG. 4C As shown, in step 450, the compressor operating rate R is determined. r Is it greater than zero? If the compressor operating rate R rgreater than zero, the flow goes to step 452; if the compressor operation rate R r not greater than zero, the compressor operation rate R r is zero, the compressor 126 is in the off state, the flow goes to step 454.

[0107] In step 452, the system target water flow rate Q target is set to the system allowable minimum water flow rate Q min , and the operation of step 452 is completed, the flow goes to step 462.

[0108] In step 454, the control device 150 sends a stop command to the water pump 124 and does not send a start command to the compressor 126 during the water pump stop stage. The operation of step 454 is completed, the flow goes to step 456.

[0109] In step 456, it is judged whether the conditioning terminal of the air conditioning unit contains a floor heating mode. If the floor heating mode is not contained, the flow goes back to step 418 to reacquire the relevant parameters; if the floor heating mode is contained, the flow goes to step 458.

[0110] In step 458, it is judged whether the water pump stop time is greater than a preset time, which can be set in the range of, for example, 20-60 minutes. If the water pump stop time is not greater than the preset time, the flow goes back to step 454; if the water pump stop time is greater than the preset time, the flow goes to step 460.

[0111] In step 460, the control device 150 sends a start command to the water pump 124 and sets the system target water flow rate Q target to the system allowable minimum water flow rate Q min , and the start-up restriction on the compressor 126 is removed. The operation of step 460 is completed, the flow goes to step 462.

[0112] In step 462, the current water flow rate Q f of the water pump 124 is detected, and the operation of step 462 is completed, the flow goes to step 464.

[0113] In step 464, it is judged whether the system target water flow rate Q target is equal to the current water flow rate Q f . If the system current water flow rate Q f is equal to the target water flow rate Q target , it indicates that the current water flow rate of the water pump meets the system operation requirement at this time, and temporary adjustment is not required, the flow goes to step 468. If the system current water flow rate Q f is not equal to the target water flow rate Q targetIf the current water flow rate Q

[0114] In step 466, the rotation speed of the water pump 124 is increased or decreased by 5%-20%. Specifically, if the current water flow rate Q f is greater than the target water flow rate Q target , the rotation speed of the water pump 124 is decreased by 5%-20%; if the current water flow rate Q f is less than the target water flow rate Q target , the rotation speed of the water pump 124 is increased by 5%-20%. After the operation of step 466 is completed, the flow goes to step 468.

[0115] In step 468, the unit maintains operation for an emergency adjustment period T u . After the operation of step 468 is completed, the flow goes back to step 418 to reacquire the relevant parameters.

[0116] FIG. 5 is a control flow chart of the water pump adjustment in the defrost mode of the air conditioning system of the present application.

[0117] As shown in FIG. 5, FIG. 5 in step 500, "start" indicates that the air conditioning system 100 enters the water pump adjustment mode, and the unit starts operation, i.e., the process from no compressor operation to compressor operation. After the unit starts operation, step 510 is entered.

[0118] In step 510, the control device 150 detects that the air conditioning system 100 is currently operating in the defrost mode, and then step 520 is entered.

[0119] In step 520, the control device 150 sets the rotation speed of the water pump to 100% of the highest rotation speed. After the operation of step 520 is completed, the flow goes to step 530.

[0120] In step 530, it is determined whether the current working mode remains the defrost mode. If the current working mode still remains the defrost mode, the flow goes back to step 520; if the current working mode is no longer the defrost mode, the flow goes to step 418, the control device 150 acquires the relevant parameters, and enters the adjustment in the heating mode.

[0121] In the above three working modes, if the total rated water flow rate Q total is greater than zero, it indicates that the water valve at the end of the air conditioning unit is in the open state, and the water pump needs to be kept in the running state. If the total rated water flow rate Q totalzero, indicating that all water valves at the end of the air conditioning unit are closed, and the water pump can be intermittently operated for energy saving. The water pump can only be stopped when the outdoor unit is in the shutdown state (the compressor stops running), so in the normal case, as long as the outdoor unit of the air conditioning system is in the working state, the water pump needs to be kept running to ensure the reliable operation of the unit.

[0122] FIG. 6 is a block diagram of the control device of the air conditioning system of the present application, showing the specific components and connection relationship of the control device 150. The control device 150 can store the program for executing the flow as shown in FIGS. 2-5 , store and call the parameters required by the flow as shown in FIGS. 2-5 .

[0123] As shown in FIG. 6 , the control device 150 includes a bus 602, a processor 604, a memory 606, an input interface 608 and an output interface 610. The processor 604, the memory 606, the input interface 608 and the output interface 610 are connected to the bus 602. The processor 604 can read the program (or instruction) from the memory 606 and execute the program (or instruction) to process the data; the processor 604 can also write the data or program (or instruction) into the memory 606. The memory 606 can store the program (instruction) or data (such as Table 1 mentioned above). By executing the instruction in the memory 606, the processor 604 can control the memory 606, the input interface 608 and the output interface 610. In the present application, the memory 606 can store the program for executing the flow as shown in FIGS. 2-5 and the operating parameters required for executing the program.

[0124] The input interface 608 is configured to receive the air conditioning system working mode parameters from the main user control device or the outdoor unit, the water valve opening and closing parameters from the user control devices 151, 152, …, 15N, the current flow parameters and the speed parameters of the water pump from the outdoor unit through the connection lines 620, 622, 624, 626 respectively, and convert the data of these parameters into signals recognizable by the processor 604 and store them in the memory 606.

[0125] The processor 604 is configured to calculate the target water flow according to the parameters and the program stored in the memory 606, calculate the water pump speed adjustment parameter according to the size of the target water flow, and send the water pump speed adjustment signal to the output interface 610. The output interface 610 is configured to control the water pump through the connection line 630 to adjust the speed of the water pump, so as to adjust the current water flow of the water pump to be equal to the calculated target water flow.

[0126] The air conditioning control system of the present application has the following advantages over the air conditioning control system in the prior art:

[0127] Compared with the prior art using the water pump pressure difference, the unit inlet and outlet water temperature difference, the indoor temperature and the set temperature difference to control the water pump flow, the application does not need to set an additional pressure sensor, uses the state of the indoor terminal valve to control the variable frequency water pump with flow feedback function, sets the target water flow according to the rated water flow of the corresponding terminal valve, adjusts the water pump rotating speed by comparing the target water flow with the current actual water flow, makes the working point of the variable frequency water pump adapt to the correct water flow of the indoor terminal valve, so as to meet the real demand or hydraulic balance of the air conditioning water system, realize the beneficial technical effects of accurately controlling the system water flow and making the water system in the most energy-saving state.

[0128] Although the application has been described in connection with the examples of the embodiments outlined above, it will be evident to those skilled in the art that various alternatives, modifications, variations, improvements, and / or substantially equivalent su itable methods, materials, and / or apparatuses, known or not now known, can be substituted for those set forth herein, without departing from the spirit or scope of the application. Additionally, the technical effects and / or technical problems described in the specification are exemplary and not limiting; therefore the disclosure in the specification can be used to solve other technical problems and have other technical effects and / or can solve other technical problems. Accordingly, the examples of the embodiments of the application as stated above are intended to be illustrative, not limiting. Various changes can be made without departing from the spirit or scope of the application. Therefore, the application is intended to include all such alternatives, modifications, variations, improvements and / or substantially equivalent su itable methods, materials, and / or apparatuses which are within the spirit and / or scope of the application.

Claims

1. A control method for a water pump in an air conditioning system, the control method comprising the steps of: S01, adjusting the air conditioning system into a normal operation phase; S02, obtaining a total rated water flow of end water valves in an open state among N end water valves of the air conditioning system; S03, setting a target water flow according to the total rated water flow; S04, obtaining a current water flow of the water pump; and S05, adjusting a rotating speed of the water pump according to a size relationship between the target water flow and the current water flow obtained in the step S04.

2. The control method of claim 1, wherein: the step S01 of adjusting the air conditioning system into the normal operation phase comprises selecting an operation mode of the air conditioning system.

3. The control method of claim 2, wherein: the operation mode comprises a heating mode and a cooling mode.

4. The control method of claim 3, wherein: in the heating mode, after the air conditioning system enters the normal operation phase, it is determined in real time whether the air conditioning system enters a defrosting mode, and if the air conditioning system enters the defrosting mode, the rotating speed of the water pump is adjusted to a highest rotating speed; if the air conditioning system does not enter the defrosting mode, the operation of the heating mode is maintained.

5. The control method of claim 3, wherein: the step S01 of adjusting the air conditioning system into the normal operation phase comprises obtaining an initial current water flow of the water pump, a compressor operation rate and a minimum water flow allowed by the air conditioning system.

6. The control method of claim 5, wherein: the step S01 of adjusting the air conditioning system into the normal operation phase further comprises adjusting the rotating speed of the water pump according to a size relationship between the initial current water flow of the water pump and the minimum water flow allowed by the air conditioning system.

7. The control method of claim 6, wherein: in the cooling mode, the step S01 of adjusting the air conditioning system into the normal operation phase further comprises obtaining a unit water outlet temperature of the air conditioning system, so as to determine a cooling low evaporation temperature water flow of the air conditioning system.

8. The control method of claim 7, wherein: the step S01 of adjusting the air conditioning system into the normal operation phase further comprises adjusting the rotating speed of the water pump according to a size relationship between the initial current water flow of the water pump and the cooling low evaporation temperature water flow of the air conditioning system.

9. The control method of claim 8, wherein: the step S03 of setting the target water flow according to the total rated water flow comprises judging whether the total rated water flow is zero.

10. The control method of claim 9, wherein: if the total rated water flow is not zero, judging a size relationship between the total rated water flow and the minimum water flow allowed by the air conditioning system: if the total rated water flow is greater than the minimum water flow allowed by the air conditioning system, setting a size of the target water flow as the total rated water flow. ​ If the total rated water flow is not greater than the minimum water flow allowed by the air conditioning system and the air conditioning system is operating in the heating mode, the target water flow is set to the minimum water flow allowed by the air conditioning system.

11. The control method of claim 10, wherein: In the cooling mode, setting the target water flow according to the total rated water flow in the S03 further comprises determining a relationship between the total rated water flow and a low evaporating temperature water flow of the air conditioning system: If the total rated water flow is greater than the minimum water flow allowed by the air conditioning system and the total rated water flow is greater than the low evaporating temperature water flow of the air conditioning system, the target water flow is set to the total rated water flow; If the total rated water flow is not greater than the minimum water flow allowed by the air conditioning system or the total rated water flow is not greater than the low evaporating temperature water flow of the air conditioning system, the target water flow is set to the greater one of the minimum water flow allowed by the air conditioning system and the low evaporating temperature water flow of the air conditioning system.

12. The control method of claim 9, wherein: If the total rated water flow is zero, determining whether the compressor operation rate is zero: If the compressor operation rate is not zero and the air conditioning system is operating in the heating mode, the target water flow is set to the minimum water flow allowed by the air conditioning system; If the compressor operation rate is not zero and the air conditioning system is operating in the cooling mode, the target water flow is set to the greater one of the minimum water flow allowed by the air conditioning system and the low evaporating temperature water flow of the air conditioning system; If the compressor operation rate is zero, the water pump is operated in a stop mode, and no start command is sent to the compressor of the air conditioning system during the stop mode of the water pump.

13. The control method of claim 12, wherein: In the heating mode, after the water pump is operated in the stop mode, determining whether the air conditioning system terminal includes a floor heating mode: If the air conditioning system terminal includes the floor heating mode, determining whether the stop time of the water pump exceeds a preset time, If the stop time of the water pump exceeds the preset time, starting the water pump, setting the target water flow to the minimum water flow allowed by the air conditioning system, and removing the restriction that no start command is sent to the compressor; If the stop time of the water pump does not exceed the preset time, maintaining the stop state of the water pump; If the terminal water valve does not include the floor heating mode, returning to the step S02.

14. The control method of claim 12, wherein: In the step S05, if the target water flow is greater than the current water flow obtained in the step S04, increasing the rotation speed of the water pump; If the target water flow is less than the current water flow obtained in the step S04, decreasing the rotation speed of the water pump; If the target water flow is equal to the current water flow obtained in the step S04, maintaining the rotation speed of the water pump unchanged.

15. The control method according to claim 1, wherein: the step S05 is followed by a return to the step S02.

16. An air conditioning system comprising N air conditioning units, characterized by The air conditioning system comprises: a water pump; N end water valves, each of the N air conditioning units comprising one of the N end water valves, one of the N end water valves being configured to control opening and closing of a water passage of the air conditioning unit; and a control device configured to acquire a total rated water flow of the end water valves in an open state among the N end water valves of the air conditioning system by receiving opening and closing signals of the N end water valves, and set a target water flow of the water pump according to the total rated water flow, wherein the control device is further configured to acquire a current water flow of the water pump, and adjust a rotation speed of the water pump according to a size relationship between the target water flow and the current water flow.

17. The air conditioning system of claim 16, wherein Further comprising: N air discs, each of the N air conditioning units comprising one of the N air discs; a water pipe connecting the water pump and the N air discs, such that a water flow loop is formed between the water pump and the N air discs, so that each of the N air discs is capable of heat exchange with a corresponding one of the N rooms, and / or N floor warmers, each of the N air conditioning units comprising one of the N floor warmers, wherein the water pipe connects the water pump and the N floor warmers, such that a water flow loop is formed between the water pump and the N floor warmers, so that each of the N floor warmers is capable of heat exchange with a corresponding one of the N rooms.

18. An air conditioning system comprising a water pump and a control device, characterized in that The control device is configured to adjust the rotation speed of the water pump by the control method according to any one of claims 1-15.

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