Heat pump air conditioning unit

Abstract

The invention discloses a heat pump air conditioning unit which comprises an outdoor unit, an indoor unit, a circulating water pump and a plurality of tail ends. The outdoor unit is used for providing refrigerant heat energy; the indoor unit is connected with the outdoor unit, converts the refrigerant heat energy into water latent heat and comprises a water inlet, a water outlet and an indoor control part; the circulating water pump is connected with the water outlet; the tail ends are connected in parallel through waterway pipelines and are respectively arranged in a plurality of heating spaces; two ends of each tail end connected in parallel are respectively connected and communicated with the circulating water pump and the water inlet to form a water circulating system; the tail end comprises a temperature control part which is used for inputting the set temperature of the heating space; the indoor control part is in communication connection with the temperature control parts, obtains the set temperatures, compares the set temperatures, obtains the maximum value of the set temperatures, and determines the set water temperature of the water circulation system according to the maximum set temperature. The heating water temperature is reduced, and energy is saved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to a heat pump air conditioning unit. Background Art

[0002] Due to unreasonable water temperature setting selection, indoor temperature fluctuations and unnecessary energy loss will occur. If a certain indoor comfort level, i.e. reasonable energy loss, needs to be maintained for a long time, the user needs to manually adjust the set water temperature of the unit, which requires the user to adjust both the indoor temperature setting and the water temperature setting of the unit, increasing the user's usage burden and reducing the user's usage experience.

[0003] In addition, the lack of intelligent water temperature control and delayed response time will cause energy waste and unit operation loss. Intelligent water temperature control of heat pump air conditioning system has become a necessary means to solve energy waste. Summary of the invention

[0004] In response to the problems pointed out in the background technology, the present application provides a heat pump air-conditioning unit, which determines the set water temperature of the water circulation system according to the maximum value of the set temperatures of each heating space, so as to meet the heating capacity and set the water temperature as low as possible, thereby realizing the automation of the set water temperature control and achieving the purpose of system energy saving.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: In some embodiments of the present application, a heat pump air conditioning unit is provided, including an outdoor unit, an indoor unit, a circulating water pump, and a plurality of terminals; The outdoor unit is used to provide refrigerant heat energy; The indoor unit is connected to the outdoor unit, converts the refrigerant heat into water latent heat, and includes a water inlet and a water outlet; the indoor unit also includes an indoor control unit; The circulating water pump is connected to the water outlet; The terminals are connected in parallel through water pipes and are respectively arranged in multiple heating spaces for heating the heating spaces; the two ends of the terminals connected in parallel are respectively connected and communicated with the circulating water pump and the water inlet; the indoor unit, the circulating water pump and the terminals are connected to form a water circulation system; the terminal includes a temperature control unit for inputting the set temperature of the heating space; the indoor control unit is respectively communicated with the temperature control units to obtain the set temperature of each terminal, compare the set temperatures, obtain the maximum value therein, and determine the set water temperature of the water circulation system according to the maximum value of the set temperatures.

[0006] In some embodiments of the present application, a plurality of electric regulating valves are further included, which are respectively connected to the indoor control unit and the opening degree is controlled by the indoor control unit; Each of the electric regulating valves is connected in series with each of the terminals through the water pipeline, and is located between each of the terminals and the circulating water pump, and is used to adjust the amount of water entering each of the terminals; The indoor control unit is provided with a startup operation mode, a normal operation mode, and a limited duration; and the startup operation mode is operated when the startup duration is within the limited duration, and the normal operation mode is entered when the limited duration is reached; The terminal further comprises a room temperature detection unit connected to the temperature control unit, which is used to detect the indoor temperature of the heating space and transmit it to the temperature control unit; In the startup operation mode, the indoor control unit controls the electric regulating valve to operate at an initial opening; In the normal operation mode, the indoor control unit obtains the set temperature and the indoor temperature corresponding to each of the terminals, calculates the difference between the set temperature and the indoor temperature, which is called the target difference, and adjusts the opening of each electric regulating valve according to each target difference.

[0007] In some embodiments of the present application, the indoor control unit is provided with a first adjustment cycle; In the normal operation mode, the indoor control unit obtains the set temperature and the indoor temperature of each terminal according to the first adjustment cycle, calculates the corresponding target difference, and adjusts the opening of the electric control valve according to each target difference.

[0008] In some embodiments of the present application, a plurality of electric regulating valves are further included, which are respectively connected to the temperature control unit and the opening degree is controlled by the temperature control unit; Each of the electric regulating valves is connected in series with each of the terminals through a water pipeline, and is located between each of the terminals and the circulating water pump, and is used to adjust the amount of water entering each of the terminals; Each of the temperature control parts is provided with a startup operation mode, a normal operation mode, and a limited time; and the terminal is controlled to start and run the startup operation mode within the limited time, and enter the normal operation mode when the startup reaches the limited time; The terminal further comprises a room temperature detection unit connected to the temperature control unit, which is used to detect the indoor temperature of the heating space and transmit it to the temperature control unit; In the startup operation mode, the temperature control unit controls the electric regulating valve to operate at an initial opening; In the normal operation mode, the temperature control unit calculates the difference between the set temperature and the indoor temperature, which is called the target difference, and adjusts the opening of the electric regulating valve according to the target difference.

[0009] In some embodiments of the present application, the temperature control unit is provided with a first adjustment cycle; In the normal operation mode, the temperature control unit obtains the set temperature and the indoor temperature according to the first adjustment period, calculates the target difference, and adjusts the opening of the electric control valve according to the target difference.

[0010] In some embodiments of the present application, the indoor control unit is provided with a second adjustment cycle; The indoor control unit obtains the opening degree and the set temperature of the electric regulating valve of each terminal in the normal operation mode according to the second regulation cycle; The indoor control unit compares the openings of the electronic regulating valves, obtains the maximum opening of the electronic regulating valve, and obtains the target temperature of each end corresponding to the electronic regulating valve with the maximum value; compares the target temperatures, and sets the target water outlet temperature of the indoor unit according to the maximum value of the target temperature.

[0011] In some embodiments of the present application, the first adjustment period is equal to the second adjustment period.

[0012] In some embodiments of the present application, when the target difference is a positive value, the opening of the electric control valve is increased, and the adjustment amplitude increases stepwise as the target difference increases; When the target difference is a negative value, the opening of the electric regulating valve is reduced, and the adjustment amplitude is reduced stepwise as the target difference increases.

[0013] In some embodiments of the present application, the set water temperature is equal to the sum of the maximum value of the set temperature and the correction value; The indoor unit further comprises a first water temperature detection unit and a second water temperature detection unit, which are respectively connected to the indoor control unit and are used to detect the water temperature of the water outlet and the water temperature of the water inlet, obtain the outlet water temperature and the inlet water temperature, and transmit the obtained outlet water temperature and the inlet water temperature to the indoor control unit; The correction value is the difference between the average water temperature of the outlet water temperature and the inlet water temperature and the indoor temperature.

[0014] In some embodiments of the present application, the correction value ranges from 2 to 10°C.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are: The heat pump air conditioning unit of the present invention determines the set water temperature of the water circulation system according to the maximum value of the set temperature of each terminal, realizes the automatic control of the set water temperature, and makes the water temperature of the water circulation system for indoor heat exchange with the heating space related to the set temperature, so that the water temperature of the water circulation system is higher than the set temperature and heats the heating space, achieving the purpose of heating, and the water temperature of the water circulation system can be set to only meet the basic heating capacity, so that the water temperature of the water circulation system is as low as possible, achieving the purpose of energy saving. That is, the present invention realizes that the set water temperature is relatively low, while meeting the requirements of all heating spaces for the heating capacity of each terminal, and reaches the required set temperature; and the lower set water temperature overall reduces the operating frequency of the outdoor unit, thereby achieving energy saving of the heat pump air conditioning unit, reducing heating costs, and protecting the environment.

[0016] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of the structural connection of a heat pump air conditioning unit according to an embodiment; Figure 2 A control module connection diagram of a heat pump air conditioning unit according to an embodiment; Figure 3 A control module connection diagram of a heat pump air conditioning unit according to an embodiment; Figure 4 A schematic diagram of a startup operation control flow of a heat pump air conditioning unit according to an embodiment; Figure 5 A schematic diagram of a control flow of a startup operation mode of a heat pump air conditioning unit according to an embodiment; Figure 6 is a schematic diagram of a control flow chart of a normal operating mode of a heat pump air conditioning unit according to an embodiment; Figure 7 A schematic diagram of a control flow of an electric regulating valve of a heat pump air-conditioning unit according to an embodiment; Figure 8 A schematic diagram of a control flow in a normal operating mode of a heat pump air conditioning unit according to an embodiment; Fig. 9 A schematic diagram of a specific example of a method for adjusting an electric regulating valve according to a temperature difference according to an embodiment; Fig.10 It is a schematic diagram of a specific example of a method for adjusting an electric regulating valve according to a temperature difference according to an embodiment.

[0019] Reference numerals: 1. Outdoor unit; 2. Indoor unit; 3. Circulating water pump; 4. Electric regulating valve; 5. Terminal; 6. Temperature control unit; 21. Indoor control unit; 22. First water temperature detection unit; 23. Second water temperature detection unit; 51. Room temperature detection unit; Ft, opening steps; ΔT, target difference; DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of the present application, unless otherwise specified, "plurality" means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0024] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 The heat pump air conditioning unit of the present application includes an outdoor unit 1, an indoor unit 2, a circulating water pump 3, and multiple terminals 5.

[0025] The outdoor unit 1 includes an evaporator, a compressor, and a throttling element; the indoor unit 2 includes a condenser; of course, the throttling element can also be set in the indoor unit 2. The compressor, condenser, throttling element, evaporator, and compressor are connected and communicated in sequence, filled with refrigerant, and a phase change cycle of the refrigerant is formed through the compression of the refrigerant by the compressor, the condensation of the condenser, the expansion of the throttling element, and the evaporation of the evaporator, and the energy is transported in the process of the phase change of the refrigerant.

[0026] Specifically, low-temperature, low-pressure refrigerant enters the compressor; the compressor compresses the low-temperature, low-pressure gaseous refrigerant to generate high-temperature, high-pressure gaseous refrigerant, which is then discharged by the compressor. The refrigerant gas discharged by the compressor flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released through the condensation process.

[0027] The throttling element expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant; the low-pressure liquid refrigerant enters the evaporator and evaporates into a low-temperature and low-pressure refrigerant gas; the low-temperature and low-pressure refrigerant gas returns to the compressor. The low-pressure liquid refrigerant absorbs heat during the evaporation process in the evaporator.

[0028] The indoor unit 2 also includes a water heat exchanger, which is connected to the condenser and converts the heat energy released by the condenser into water latent heat; the water heat exchanger includes a water inlet and a water outlet.

[0029] The circulating water pump 3 is connected to and communicates with the water outlet waterway; multiple terminals 5 are connected in parallel through waterway pipes; each terminal 5 is respectively arranged in multiple heating spaces for heating each heating space. The terminal 5 can be implemented in various forms, such as floor heating, fan coil, etc.

[0030] The two ends of each parallel terminal 5 are connected and communicated with the circulating water pump 3 and the water inlet water path, respectively, to form a water circulation system, and the circulating water pump 3 drives the water path to flow. That is, the circulating water pump 3 drives the hot water in the indoor unit 2 to enter each terminal 5, and after heat exchange in each terminal 5, it returns to the indoor unit 2 to exchange heat with the condenser. The indoor unit 2 also includes an indoor control unit 21 for controlling the water temperature of the water circulation system.

[0031] The terminal 5 includes a temperature control unit 6, which is used to input the set temperature of the corresponding heating space; the set temperature is the target temperature that the heating space wants to reach. The indoor control unit 21 communicates with each temperature control unit 6, obtains the set temperature of each terminal 5, and compares each set temperature to obtain the maximum value of each set temperature, which is used to determine the set water temperature of the water circulation system, that is, the target water temperature of the water circulation system. In the embodiment of the present application, the water temperature control of the water circulation system adopts the outlet water temperature control.

[0032] The heat pump air-conditioning unit of the present application determines the set water temperature of the water circulation system according to the maximum value of the set temperature of each terminal 5, realizes the automatic control of the set water temperature, and makes the water temperature of the water circulation system for indoor heat exchange with the heating space related to the set temperature, so that the water temperature of the water circulation system is higher than the set temperature and heats the heating space, achieving the purpose of heating, and the water temperature of the water circulation system can be set to only meet the basic heating capacity, so that the water temperature of the water circulation system is as low as possible, achieving the purpose of energy saving. That is, the present invention realizes that the set water temperature is lower, while meeting the requirements of all heating spaces for the heating capacity of each terminal 5, and reaches the required set temperature; and the lower set water temperature overall reduces the operating frequency of the outdoor unit 1, thereby achieving energy saving of the heat pump air-conditioning unit, reducing heating costs, and protecting the environment.

[0033] The water temperature control method of the water circulation system of the heat pump air conditioning unit of the present invention is described in detail below through specific embodiments.

[0034] In some specific embodiments, reference Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 The heat pump air-conditioning unit also includes a plurality of electric regulating valves 4, which can be controlled to change the opening degree, thereby changing the amount of liquid or gas passing through them; each electric regulating valve 4 is respectively connected to the indoor control unit 21, and the opening degree is controlled by the indoor control unit 21; each electric regulating valve 4 is respectively connected in series with the water circuit of each terminal 5, and is respectively located between each terminal 5 and the circulating water pump 3, and is used to adjust the amount of water entering each corresponding terminal 5, thereby changing the heat exchange in the terminal 5 by changing the water amount, and adjusting the temperature of the heating space, the temperature change speed and direction.

[0035] The indoor control unit 21 is provided with a startup operation mode, a normal operation mode, and a limited duration. When the terminal 5 starts the temperature control S11, the indoor control unit 21 controls the corresponding electric regulating valve 4 to enter the startup operation mode S12; the indoor control unit 21 determines whether the operation time of the temperature control unit 6 of the corresponding terminal 5 reaches the limited duration S13; when the operation time of the temperature control unit 6 does not reach the limited duration, the indoor control unit 21 continues to operate the startup operation mode S12 to control the electric regulating valve 4; when the operation time of the temperature control unit 6 reaches the limited duration, the indoor control unit 21 enters the normal operation mode S14 to control the electric regulating valve 4.

[0036] The terminal 5 also includes a room temperature detection unit 51 connected to the temperature control unit 6 , which is used to detect the indoor temperature of the heating space and transmit it to the temperature control unit 6 .

[0037] In the startup operation mode, the indoor control unit 21 controls the electric regulating valve 4 to operate at an initial opening degree.

[0038] In the normal operating mode, the indoor control unit 21 executes the temperature control units 6 to obtain the set temperature and indoor temperature S41 of each corresponding terminal 5; calculates the difference S42 between the set temperature and the indoor temperature, which is called the target difference ΔT; and the indoor control unit 21 adjusts the opening of each corresponding electric regulating valve 4 according to each target difference ΔT.

[0039] The heat pump air-conditioning unit of this embodiment adjusts the opening of each electric regulating valve 4 through the target difference ΔT, achieves the purpose of regulating the indoor temperature by changing the water volume, reduces the control frequency of the water temperature of the water circulation system, and keeps it in a relatively stable and low state; that is, when the indoor temperature regulation can be solved by controlling the water volume, the water temperature setting is not changed, the operating frequency of the outdoor unit 1 is reduced, and energy is saved.

[0040] In addition, in the startup operation mode, the indoor control unit 21 controls the initial opening of the electric regulating valve 4 to be usually set to a full opening or a larger opening, which is used to increase the speed of increasing the indoor temperature in the initial stage of heating space temperature control and improve the user experience.

[0041] In some specific embodiments, reference Figure 7 , Figure 8 The indoor control unit 21 is provided with a first regulation cycle, which is used to control the regulation frequency of the electric regulating valve 4.

[0042] In the normal operation mode, the indoor control unit 21 executes the control according to the first adjustment cycle to obtain the set temperature and indoor temperature of each terminal 5 in the temperature control state S41, calculates the corresponding target difference ΔT S42, and adjusts the opening of each corresponding electric control valve 4 according to each target difference ΔT.

[0043] That is, after the indoor control unit 21 obtains the set temperature and indoor temperature S41 of each terminal 5 in the temperature control state, and adjusts the opening of the corresponding electric control valve 4 according to the calculated target difference ΔT, it determines whether the timing of the first adjustment cycle is completed S46. If the timing of the first adjustment cycle is completed, the set temperature and indoor temperature S41 are obtained again, the target difference ΔTS42 is calculated, and the opening of the electric control valve 4 is adjusted. If the timing of the first adjustment cycle is not completed, wait until it is completed before performing the next acquisition, calculation and adjustment.

[0044] The heat pump air conditioning unit of this embodiment can set the size of the first adjustment cycle according to the water temperature change rate or room temperature change rate caused by the system size and the set water volume, so that the heating space is in a temperature comfort zone, saving energy while improving user experience and comfort.

[0045] In some specific embodiments, the indoor control unit 21 controls the corresponding electric regulating valve 4 to operate at an initial opening for a limited time for the terminal 5 that enters a temperature control state during the operation of the indoor unit and the outdoor unit; that is, the indoor control unit 21 controls the operation of the electric regulating valve 4 in a startup operation mode.

[0046] When the terminal 5 completes the next first adjustment cycle of the startup operation mode, it starts to obtain the corresponding set temperature and indoor temperature, and adjusts the opening of the electric control valve 4 according to the target difference ΔT.

[0047] In some specific embodiments, reference Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 The heat pump air conditioning unit further includes a plurality of electric regulating valves 4 , which are respectively connected to the temperature control parts 6 of the corresponding terminals 5 , and the opening degrees are controlled and adjusted by the corresponding temperature control parts 6 .

[0048] Each electric regulating valve 4 is connected in series with the corresponding water path of each terminal 5 , and is located between each corresponding terminal 5 and the circulating water pump 3 , so as to adjust the amount of water entering the corresponding terminal 5 .

[0049] Each temperature control unit 6 is provided with a startup operation mode, a normal operation mode, and a limited duration. When the temperature control unit 6 corresponding to the terminal 5 starts the temperature control S11, the startup operation mode S12 is operated for a limited duration; in the startup operation mode, the temperature control unit 6 controls the corresponding electric regulating valve 4 to operate at the initial opening. When the startup operation mode operation duration reaches the limited duration, the normal operation mode is entered.

[0050] That is, when the temperature control unit 6 enters the temperature control state, it starts the startup operation mode S12, and determines whether the running time of the startup operation mode reaches the limited time S13; if the running time of the startup operation mode reaches the limited time, the control enters the normal operation mode S14; of course, if the running time of the startup operation mode does not reach the running set time, the startup operation mode S12 is continued.

[0051] The terminal 5 further includes a room temperature detection unit 51 connected to the temperature control unit 6 , which is used to detect the indoor temperature of the heating and air conditioning and transmit it to the temperature control unit 6 .

[0052] In the normal operation mode, the temperature control unit 6 obtains the set temperature and the indoor temperature S41, calculates the difference between the set temperature and the indoor temperature S42, defines it as a target difference ΔT, and adjusts the opening of the electric control valve 4 according to the target difference ΔT.

[0053] The heat pump air-conditioning unit of this embodiment adjusts the opening of each electric regulating valve 4 through the target difference ΔT, achieves the purpose of regulating the indoor temperature by changing the water volume, reduces the control frequency of the water temperature of the water circulation system, and keeps it in a relatively stable and low state; that is, when the indoor temperature regulation can be solved by controlling the water volume, the water temperature setting is not changed, the operating frequency of the outdoor unit 1 is reduced, and energy is saved.

[0054] In some specific embodiments, reference Figure 7 , Figure 8 The temperature control unit 6 is provided with a first adjustment cycle, which is used to control the adjustment frequency of the electric control valve 4.

[0055] In the normal operation mode, each temperature control unit 6 obtains its own set temperature and indoor temperature according to the first adjustment cycle S41, calculates the corresponding target difference ΔT S42, and adjusts the opening of the corresponding electric control valve 4 according to the target difference ΔT.

[0056] That is, after the temperature control unit 6 obtains the respective set temperature and indoor temperature and adjusts the opening of the corresponding electric regulating valve 4 according to the calculated target difference ΔT, it determines whether the timing of the first adjustment cycle is completed S46; if the timing of the first adjustment cycle is completed, the set temperature and indoor temperature are obtained again S41, the target difference ΔT is calculated S42, and the opening of the electric regulating valve 4 is adjusted; if the timing of the first adjustment cycle is not completed, it waits until it is completed before the next acquisition, calculation and adjustment. And the judgment of whether the timing of the first adjustment cycle is completed, obtaining the set temperature and indoor temperature, calculating the target difference and adjusting the opening of the electric regulating valve are executed cyclically.

[0057] The indoor control unit 21 of the heat pump air-conditioning unit of this embodiment can set the size of the first adjustment cycle according to the different system sizes configured, the water temperature change rate caused by the set water volume, or the room temperature change rate, so that the heating space is in a temperature comfort zone, saving energy while improving user experience and comfort.

[0058] In some specific embodiments, when the heat pump air conditioning unit is operating, the temperature control unit 6 of the newly added terminal 5 that enters the temperature control state controls the electric regulating valve 4 to operate at an initial opening for a limited time, and after the operating time reaches the limited time, the opening of the electric regulating valve 4 is adjusted by the target difference ΔT.

[0059] In some specific embodiments, reference Figure 1 , Figure 5 , Figure 6 , Figure 8 The indoor control unit 21 is provided with a second adjustment cycle, which is used to adjust the frequency determined by the set water temperature of the water circulation system.

[0060] When the control of the electric regulating valve 4 corresponding to each terminal 5 is in the start-up operation mode, the indoor control unit 21 obtains the set temperature S21 of each terminal 5, compares the set temperatures to obtain the maximum value S22 of each set temperature, which is called the maximum set temperature; the set water temperature of the water circulation system is determined according to the maximum set temperature. And the period of obtaining the set temperature and determining the set water temperature is the second adjustment period.

[0061] That is, after the first execution of obtaining each set temperature, comparing each set temperature to obtain the maximum set temperature, and determining the set water temperature, it is determined whether the timing of the second adjustment cycle is completed; if it is completed, the next time the set temperature is obtained, the set temperature is compared, and the set water temperature is determined; if it is not completed, it waits until it is completed before the next acquisition, comparison, and determination of the set water temperature are performed. The subsequent cycle determines whether the timing of the second adjustment cycle and the acquisition of each set temperature, comparison of each setting, and determination of the set water temperature are completed.

[0062] When the control of the electric regulating valves 4 corresponding to each terminal 5 is in the normal operating mode, the indoor control unit 21 obtains the opening of each electric regulating valve 4, that is, the number of opening steps S31 according to the second adjustment cycle; the indoor control unit 21 compares the obtained openings S32 of each electric regulating valve 4, obtains the electric regulating valve 4 with the largest opening and obtains the set temperature S21 of the terminal 5 corresponding to each electric regulating valve 4 with the largest opening; compares each set temperature to obtain the maximum value S22 of each set temperature, which is called the maximum set temperature; determines the set water temperature S23 of the water circulation system according to the maximum set temperature.

[0063] That is, the indoor control unit 21 executes the steps of obtaining the opening of each electric regulating valve 4 S31, comparing the opening of each electric regulating valve 4, obtaining the electric regulating valve 4 with the largest opening S32, and obtaining the set temperature S21 of the terminal 5 corresponding to each electric regulating valve 4 with the largest opening, comparing the set temperatures, obtaining the maximum set temperature S22, and determining the set water temperature of the water circulation system according to the maximum set temperature S23. After the above control is completed, it is determined whether the timing of the second adjustment cycle is completed S24. If it is completed, the next step of obtaining the opening of each electric regulating valve 4 S31, comparing the opening of each electric regulating valve 4, obtaining the set temperature S21 of the terminal 5 corresponding to the electric regulating valve 4 with the largest opening S32, obtaining the maximum set temperature S22, and determining the set water temperature of the water circulation system S23 is performed; if the timing of the second adjustment cycle is not completed, it continues to wait until it is completed before the next acquisition, comparison and determination of the set water temperature are performed.

[0064] The heat pump air-conditioning unit of this embodiment controls the water flow by controlling the opening degree of the electric regulating valve 4 at each end 5 through the target difference ΔT, thereby controlling the indoor temperature of different heating spaces to reach the user's set temperature, and uses the maximum value of the set temperature of the end 5 corresponding to the electric regulating valve 4 with the largest number of opening steps as the basis for determining the set water temperature of the water circulation system, so that the heat pump air-conditioning unit can minimize the set water temperature of the water circulation system while meeting the indoor temperature regulation of each independent heating space, reduce the operating frequency of the heat pump unit, and achieve overall system energy saving.

[0065] In some specific embodiments, when there are electric regulating valves 4 under normal operation mode control and electric regulating valves 4 under start-up operation mode control, the electric regulating valves 4 operating with the initial opening and the corresponding terminals 5 participate in the comparison of the openings and the comparison of the set temperatures. That is, when there are electric regulating valves 4 under normal operation mode control and electric regulating valves 4 under start-up operation mode control, the openings of the electric regulating valves 4 corresponding to all the terminals 5 in the temperature control state are obtained S31; the openings of the electric regulating valves 4 are compared to obtain the electric regulating valve 4 with the largest opening value S32; the set temperatures of the terminals 5 corresponding to the electric regulating valves 4 with the largest opening values ​​are compared to obtain the maximum value of the set temperatures S21, which is used to determine the set water temperature of the water circulation system S23.

[0066] In some specific embodiments, reference Figure 8 , the first adjustment cycle is equal to the second adjustment cycle; then the opening of the electric regulating valve 4 is adjusted first, and then the set water temperature of the water circulation system is determined according to the opening adjustment result of the electric regulating valve 4.

[0067] Specifically, execute n times to obtain the indoor temperature and the set temperature S41; calculate the target difference ΔT S42 between the set temperature and the indoor temperature; adjust the opening of the electric control valve 4 according to the target difference ΔT; obtain the opening of each electric control valve 4 S31; compare the opening of each electric control valve 4; obtain the set temperature S21 of the terminal 5 corresponding to the electric control valve 4 with the maximum opening value S32; compare the set temperatures; obtain the maximum set temperature, i.e., the maximum set temperature S22, which is used to determine the set water temperature S23 of the water circulation system.

[0068] Determine whether the timing of the first adjustment cycle is completed S46. If completed, obtain the indoor temperature and set temperature S41 n+1 times and adjust the opening of the electric control valve 4 and the set water temperature of the water circulation system according to the target difference ΔT; if the timing of the first adjustment cycle is not completed, continue to wait for completion and then obtain, adjust and determine n+1 times.

[0069] In some specific embodiments, the first adjustment cycle is smaller than the second adjustment cycle, and the second adjustment cycle is an integer multiple of the first adjustment cycle; that is, multiple adjustments of the opening of the electric regulating valve 4 correspond to one determination (adjustment) of the set water temperature.

[0070] In some specific embodiments, reference Figure 6 When comparing the openings of the electric regulating valves 4, the number of the electric regulating valves 4 with the maximum opening obtained may be one or more; executing the judgment whether the number of the ends of the electric regulating valves corresponding to the maximum opening step number is greater than one S33; when the number of the electric regulating valves 4 with the maximum opening is one, the set water temperature of the water circulation system is determined according to the set temperature of the end 5 corresponding to the electric regulating valve 4 with the maximum opening S25; when there are multiple electric regulating valves 4 with the maximum opening, the set temperature of the end 5 corresponding to each electric regulating valve 4 is obtained, and the set temperatures are compared to obtain the maximum set temperature S22 as the basis for determining the set water temperature of the water circulation system.

[0071] In some specific embodiments, reference Figure 5 , Figure 6 , Figure 8 In step S23, the set water temperature of the water circulation system is the sum of the maximum set temperature and the correction value.

[0072] The indoor unit 2 also includes a first water temperature detection unit 22 and a second water temperature detection unit 23, which are respectively arranged at the water inlet and the water outlet, and are respectively connected to the indoor control unit 21, for obtaining the water temperature at the water outlet and the water inlet, and transmitting the obtained water outlet temperature and water inlet temperature to the indoor control unit 21.

[0073] The correction value is the difference between the average value of the inlet water temperature and the outlet water temperature and the indoor temperature.

[0074] That is, Tws=Trs_max+(Ti+To) / 2-Tr; Among them, Tws is the set water temperature of the water circulation system; Trs_max is the maximum set temperature; Trs is the set temperature; Ti is the inlet water temperature; To is the outlet water temperature; Tr is the indoor temperature.

[0075] In some specific embodiments, the correction value ranges from 2 to 10°C.

[0076] That is, when the correction value calculated by the formula (Ti+To) / 2-Tr is less than 2°C, the correction value is 2°C; when the correction value calculated is greater than 10°C, the correction value is 10°C. This prevents the set water temperature from changing too much and improves the energy saving level.

[0077] In some specific embodiments, reference Figure 7 , 9 , 10. The specific contents of controlling the adjustment of the electric regulating valve 4 according to the target difference ΔT of the heat pump air conditioning unit are as follows.

[0078] Execute the determination of the target difference ΔT S43; when the target difference ΔT is a positive value, increase the opening of the electric control valve 4 S44, and the adjustment amplitude increases stepwise with the increase of the target difference ΔT.

[0079] When the target difference ΔT is a negative value, the opening degree of the electric control valve 4 is reduced S45, and the adjustment amplitude is reduced stepwise as the target difference ΔT increases.

[0080] The heat pump air-conditioning unit of this embodiment reduces the control difficulty and improves the control efficiency and accuracy by adopting the step-wise change of the opening adjustment value of the electric regulating valve 4 along with the target difference ΔT.

[0081] Reference Fig. 9 , Fig.10 The exemplary method of adjusting the opening of the electric regulating valve 4 is shown. A plurality of positive reference values ​​and negative reference values ​​are uniformly set to calibrate the target difference ΔT; a plurality of positive adjustment opening steps Ft and negative adjustment opening steps Ft are uniformly set as function values ​​of the adjustment opening steps Ft obtained from the target difference ΔT.

[0082] That is, if the target difference ΔT is between adjacent positive reference values, it corresponds to a function value of a positive adjustment opening step Ft, and the opening of the electric control valve 4 is increased by the corresponding positive adjustment opening step Ft; if the target difference ΔT is between adjacent negative reference values, it corresponds to a function value of a negative adjustment opening step Ft, and the opening of the electric control valve 4 is reduced by the absolute value of the negative adjustment opening step Ft.

[0083] Specifically, the positive reference value settings are a, b, c, d, and e, and the negative reference value settings are -a, -b, -c, -d, and -e; the positive adjustment opening step number Ft is set to n1, n2, n3, n4, and n5, and the negative adjustment opening step number Ft is set to -n1, -n2, -n3, -n4, and -n5.

[0084] When the target difference ΔT is between 0 and a, the opening of the electric control valve 4 increases by n1, and when it is 0, n1 is increased; when it is a, n2 is increased; when the target difference ΔT is between a and b, the opening of the electric control valve 4 increases by n2, and when the target difference ΔT is b, n3 is increased; when the target difference ΔT is between b and c, the opening of the electric control valve 4 increases by n3, and when the target difference ΔT is c, n4 is increased; when the target difference ΔT is between c and d, the opening of the electric control valve 4 increases by n4, and when the target difference ΔT is d, n5 is increased; when the target difference ΔT is between d and e or greater than e, the opening of the electric control valve 4 increases by n5.

[0085] When the target difference ΔT is between 0 and -a, the opening of the electric control valve 4 is not adjusted; when the target difference ΔT is between -a and -b and is equal to -a, the opening of the electric control valve 4 is reduced by n1, and when the target difference ΔT is b, it is reduced by n2; when the target difference ΔT is between -b and -c, the opening of the electric control valve 4 is reduced by n2, and when the target difference ΔT is -c, it is reduced by n3; when the target difference ΔT is between -c and -d, the opening of the electric control valve 4 is reduced by n3, and when the target difference ΔT is -d, it is reduced by n4; when the target difference ΔT is between -d and -e, the opening of the electric control valve 4 is reduced by n4; when the target difference ΔT is -e and less than -e, the opening of the electric control valve 4 is reduced by n5.

[0086] a, b, c, d, e are set between 0.1°C and 5°C. n1, n2, n3, n4, n5 are set according to the opening of the electric regulating valve 4 actually configured.

[0087] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0088] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A heat pump air conditioning unit, comprising: An outdoor unit, which is used to provide refrigerant heat energy; An indoor unit, which is connected to the outdoor unit and converts the refrigerant heat into water latent heat, comprises a water inlet and a water outlet; the indoor unit also comprises an indoor control unit; A circulating water pump connected to the water outlet; Multiple ends; They are connected in parallel through water pipes and are respectively arranged in multiple heating spaces for heating each of the heating spaces; both ends of each of the parallel terminals are respectively connected and communicated with the circulating water pump and the water inlet; the indoor unit, the circulating water pump, and the terminals are connected to form a water circulation system; Characterized in that the terminal includes a temperature control unit for inputting a set temperature of the heating space; The indoor control unit is respectively connected to the temperature control units for communication, obtains the set temperature of each terminal, compares the set temperatures, obtains the maximum value thereof, and determines the set water temperature of the water circulation system according to the maximum value of the set temperatures.

2. The heat pump air conditioning unit according to claim 1, characterized in that: It also includes a plurality of electric regulating valves, which are respectively connected to the indoor control unit and the opening degree is controlled by the indoor control unit; Each of the electric regulating valves is connected in series with each of the terminals through the water pipeline, and is located between each of the terminals and the circulating water pump, and is used to adjust the amount of water entering each of the terminals; The indoor control unit is provided with a startup operation mode, a normal operation mode, and a limited duration; and the startup operation mode is operated when the startup duration is within the limited duration, and the normal operation mode is entered when the limited duration is reached; The terminal further comprises a room temperature detection unit connected to the temperature control unit, which is used to detect the indoor temperature of the heating space and transmit it to the temperature control unit; In the startup operation mode, the indoor control unit controls the electric regulating valve to operate at an initial opening; In the normal operation mode, the indoor control unit obtains the set temperature and the indoor temperature corresponding to each of the terminals, calculates the difference between the set temperature and the indoor temperature, which is called the target difference, and adjusts the opening of each electric regulating valve according to each target difference.

3. The heat pump air conditioning unit according to claim 2, characterized in that: The indoor control unit is provided with a first adjustment cycle; In the normal operation mode, the indoor control unit obtains the set temperature and the indoor temperature of each terminal according to the first adjustment cycle, calculates the corresponding target difference, and adjusts the opening of the electric control valve according to each target difference.

4. The heat pump air conditioning unit according to claim 1, characterized in that: It also includes a plurality of electric regulating valves, which are respectively connected to the temperature control unit and the opening degree is controlled by the temperature control unit; Each of the electric regulating valves is connected in series with each of the terminals through a water pipeline, and is located between each of the terminals and the circulating water pump, and is used to adjust the amount of water entering each of the terminals; Each of the temperature control parts is provided with a startup operation mode, a normal operation mode, and a limited time; and the terminal is controlled to start and run the startup operation mode within the limited time, and enter the normal operation mode when the startup reaches the limited time; The terminal further comprises a room temperature detection unit connected to the temperature control unit, which is used to detect the indoor temperature of the heating space and transmit it to the temperature control unit; In the startup operation mode, the temperature control unit controls the electric regulating valve to operate at an initial opening; In the normal operation mode, the temperature control unit calculates the difference between the set temperature and the indoor temperature, which is called the target difference, and adjusts the opening of the electric regulating valve according to the target difference.

5. The heat pump air conditioning unit according to claim 4, characterized in that: The temperature control unit is provided with a first adjustment cycle; In the normal operation mode, the temperature control unit obtains the set temperature and the indoor temperature according to the first adjustment period, calculates the target difference, and adjusts the opening of the electric control valve according to the target difference.

6. The heat pump air conditioning unit according to claim 3 or 5, characterized in that: The indoor control unit is provided with a second adjustment cycle; The indoor control unit obtains the opening degree and the set temperature of the electric regulating valve of each terminal in the normal operation mode according to the second regulation cycle; The indoor control unit compares the openings of the electronic regulating valves, obtains the maximum opening of the electronic regulating valve, and obtains the target temperature of each end corresponding to the electronic regulating valve with the maximum value; compares the target temperatures, and sets the target water outlet temperature of the indoor unit according to the maximum value of the target temperature.

7. The heat pump air conditioning unit according to claim 6, characterized in that: The first adjustment period is equal to the second adjustment period.

8. The heat pump air conditioning unit according to any one of claims 2 to 5, characterized in that: When the target difference is a positive value, the opening of the electric regulating valve is increased, and the adjustment amplitude increases stepwise as the target difference increases; When the target difference is a negative value, the opening of the electric regulating valve is reduced, and the adjustment amplitude is reduced stepwise as the target difference increases.

9. The heat pump air conditioning unit according to claim 8, characterized in that: The set water temperature is equal to the sum of the maximum value of the set temperature and the correction value; The indoor unit further comprises a first water temperature detection unit and a second water temperature detection unit, which are respectively connected to the indoor control unit and are used to detect the water temperature of the water outlet and the water temperature of the water inlet, obtain the outlet water temperature and the inlet water temperature, and transmit the obtained outlet water temperature and the inlet water temperature to the indoor control unit; The correction value is the difference between the average water temperature of the outlet water temperature and the inlet water temperature and the indoor temperature.

10. The heat pump air conditioning unit according to claim 9, characterized in that: The correction value ranges from 2 to 10°C.

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