Heat pump air conditioning unit

Abstract

The application discloses a heat pump air conditioning unit, comprising an outdoor unit, an indoor unit, a circulating water pump, a plurality of terminals; the outdoor unit is used for providing refrigerant heat energy; the indoor unit is connected with the outdoor unit, and converts the refrigerant heat energy into water latent heat, comprising a water inlet, a water outlet, an indoor control part; the circulating water pump is connected with the water outlet; each terminal is connected in parallel through a water route pipeline and is arranged in a plurality of heating spaces; two ends of each terminal connected in parallel are connected and communicated with the circulating water pump and the water inlet respectively, forming a water circulation system; the terminal comprises a temperature control part, which is used for inputting the set temperature of the heating space; the indoor control part is connected in communication with each temperature control part respectively, obtains each set temperature, compares each set temperature, obtains the maximum value, and determines the set water temperature of the water circulation system according to the maximum set temperature. The application reduces the heating water temperature and saves energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioning technology, in particular to a heat pump air conditioning unit. BACKGROUND

[0002] Due to unreasonable water temperature setting selection, indoor temperature fluctuation and unnecessary energy loss will occur. If the indoor comfort degree needs to be maintained for a long time, i.e. reasonable energy loss, the user needs to manually adjust the water temperature setting of the unit, which increases the user's use burden and reduces the user's use experience.

[0003] In addition, due to the lack of intelligence and the delay of the water temperature control, energy is wasted and the unit operation loss is caused. The intelligent control of the water temperature of the heat pump air conditioning unit system becomes a necessary means to solve the energy waste. SUMMARY

[0004] In view of the problems in the background art, 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 temperature of each heating space, so as to meet the heating capacity and make the set 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] To achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0006] In some embodiments of the present application, a heat pump air conditioning unit is provided, which comprises an outdoor unit, an indoor unit, a circulating water pump, and a plurality of terminals.

[0007] The outdoor unit is used to provide refrigerant heat energy.

[0008] The indoor unit is connected with the outdoor unit, converts the refrigerant heat energy into water latent heat, and comprises a water inlet and a water outlet. The indoor unit further comprises an indoor control part.

[0009] The circulating water pump is connected with the water outlet.

[0010] Each terminal is connected in parallel through a water pipeline and is arranged in a plurality of heating spaces for heating each heating space. Both ends of each parallel terminal are connected with and communicated with the circulating water pump and the water inlet. The indoor unit, the circulating water pump, and each terminal are communicated to form a water circulation system. The terminal comprises a temperature control part for inputting the set temperature of the heating space. The indoor control part is communicatively connected with each temperature control part, acquires the set temperature of each terminal, compares each set temperature, acquires the maximum value, and determines the set water temperature of the water circulation system according to the maximum value of each set temperature.

[0011] In some embodiments of the present application, a plurality of electric regulating valves are connected to the indoor control unit, and the opening degree of each electric regulating valve is controlled by the indoor control unit.

[0012] Each electric regulating valve is connected to each terminal in series through the water pipeline, and is located between each terminal and the circulating water pump, for regulating the water flow into each terminal.

[0013] The indoor control unit is provided with a start-up operation mode, a normal operation mode, and a limited time period; and when the start-up operation mode is running within the limited time period, the normal operation mode is entered when the limited time period is reached.

[0014] The terminal further comprises a room temperature detection unit connected to the temperature control unit, for detecting the indoor temperature of the heating space and transmitting it to the temperature control unit.

[0015] In the start-up operation mode, the indoor control unit controls the electric regulating valve to run at an initial opening degree.

[0016] In the normal operation mode, the indoor control unit obtains the set temperature and the indoor temperature corresponding to each terminal, calculates the difference between the set temperature and the indoor temperature, which is called the target difference, and adjusts the opening degree of each electric regulating valve according to the target difference.

[0017] In some embodiments of the present application, the indoor control unit is provided with a first adjustment period.

[0018] 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 period, calculates the corresponding target difference, and adjusts the opening degree of the electric regulating valve according to the target difference.

[0019] In some embodiments of the present application, a plurality of electric regulating valves are connected to the temperature control unit, and the opening degree of each electric regulating valve is controlled by the temperature control unit.

[0020] Each electric regulating valve is connected to each terminal in series through the water pipeline, and is located between each terminal and the circulating water pump, for regulating the water flow into each terminal.

[0021] Each temperature control unit is provided with a start-up operation mode, a normal operation mode, and a limited time period; and the start-up operation mode is run when the terminal is started and within the limited time period, and the normal operation mode is entered when the start-up operation mode is started for the limited time period.

[0022] The terminal further comprises a room temperature detection unit connected to the temperature control unit, which is configured to detect the indoor temperature of the heating space and transmit the indoor temperature to the temperature control unit;

[0023] In the starting operation mode, the temperature control unit controls the electric regulating valve to operate at an initial opening degree;

[0024] In the normal operation mode, the temperature control unit calculates a difference between the set temperature and the indoor temperature, referred to as a target difference, and adjusts the opening degree of the electric regulating valve according to the target difference.

[0025] In some embodiments of the present application, the temperature control unit is provided with a first adjustment period;

[0026] In the normal operation mode, the temperature control unit acquires the set temperature and the indoor temperature according to the first adjustment period, calculates the target difference, and adjusts the opening degree of the electric regulating valve according to the target difference.

[0027] In some embodiments of the present application, the indoor control unit is provided with a second adjustment period;

[0028] The indoor control unit acquires the opening degree of the electric regulating valve of each terminal in the normal operation mode and the set temperature according to the second adjustment period.

[0029] The indoor control unit compares the opening degrees of the electric regulating valves, acquires the opening degree of the electric regulating valve with the maximum value, acquires the target temperature of each terminal corresponding to the electric regulating valve with the maximum value, compares the target temperatures, and sets the water outlet temperature target value of the indoor unit according to the maximum value of the target temperatures.

[0030] In some embodiments of the present application, the first adjustment period is equal to the second adjustment period.

[0031] In some embodiments of the present application, when the target difference is positive, the opening degree of the electric regulating valve is increased, and the adjustment amplitude is increased stepwise with the increase of the target difference;

[0032] When the target difference is negative, the opening degree of the electric regulating valve is decreased, and the adjustment amplitude is decreased stepwise with the increase of the target difference.

[0033] 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 a correction value.

[0034] The indoor unit further comprises a first water temperature detection unit and a second water temperature detection unit, which are connected to the indoor control unit respectively, for detecting the water temperature of the water outlet and the water temperature of the water inlet, obtaining the outlet water temperature and the inlet water temperature, and transmitting the obtained outlet water temperature and inlet water temperature to the indoor control unit.

[0035] 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.

[0036] In some embodiments of the present application, the correction value ranges from 2 to 10℃.

[0037] Compared with the prior art, the present application has the following advantages and positive effects:

[0038] 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, 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 to provide heat for the heating space, and the purpose of heating is achieved. 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, and the purpose of energy saving is achieved. That is, the present application realizes a lower set water temperature while meeting the requirements of all heating spaces for the heating capacity of each terminal to achieve the required set temperature. The lower set water temperature reduces the operating frequency of the outdoor unit as a whole, thereby realizing energy saving of the heat pump air conditioning unit, reducing heating cost, and protecting the environment.

[0039] Other features and advantages of the present application will become more apparent after reading the detailed description of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0041] Figure 1 It is a connection diagram of the composition structure of the heat pump air conditioning unit according to the embodiment;

[0042] Figure 2 It is a connection diagram of the control module of the heat pump air conditioning unit according to the embodiment;

[0043] Figure 3 It is a connection diagram of the control module of the heat pump air conditioning unit according to the embodiment;

[0044] Figure 4 Fig. 2 is a schematic diagram of a start-up operation control flow of the heat pump air conditioning unit according to the embodiment;

[0045] Figure 5 Fig. 3 is a schematic diagram of a start-up operation mode control flow of the heat pump air conditioning unit according to the embodiment;

[0046] Figure 6 Fig. 4 is a schematic diagram of a normal operation mode control flow of the heat pump air conditioning unit according to the embodiment;

[0047] Figure 7 Fig. 5 is a schematic diagram of an electrically-controlled regulating valve control flow of the heat pump air conditioning unit according to the embodiment;

[0048] Figure 8 Fig. 6 is a schematic diagram of a control flow of the heat pump air conditioning unit in the normal operation mode according to the embodiment;

[0049] Figure 9 Fig. 7 is a schematic diagram of a specific example of the regulating method of the electrically-controlled regulating valve according to the temperature difference according to the embodiment;

[0050] Figure 10 Fig. 8 is a schematic diagram of a specific example of the regulating method of the electrically-controlled regulating valve according to the temperature difference according to the embodiment.

[0051] Reference signs:

[0052] 1, outdoor unit; 2, indoor unit; 3, circulating water pump; 4, electrically-controlled 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 degree step number; ΔT, target difference; DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0054] In the description of the present application, it should be understood that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0055] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0057] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 The heat pump air conditioning unit of the present application comprises an outdoor unit 1, an indoor unit 2, a circulating water pump 3, and a plurality of terminals 5.

[0058] The outdoor unit 1 comprises an evaporator, a compressor, and a throttling element; the indoor unit 2 comprises a condenser; of course, the throttling element can also be arranged in the indoor unit 2. The compressor, the condenser, the throttling element, the evaporator, and the compressor are connected in sequence and in communication, filled with refrigerant, and through the compression of the refrigerant by the compressor, the condensation of the refrigerant by the condenser, the expansion of the refrigerant by the throttling element, and the evaporation of the refrigerant by the evaporator, a phase change cycle of the refrigerant is formed, and the energy transfer is completed in the process of the phase change of the refrigerant.

[0059] Specifically, the low-temperature and low-pressure refrigerant enters the compressor; the compressor compresses the low-temperature and low-pressure gaseous refrigerant to generate high-temperature and high-pressure gaseous refrigerant, which is discharged by the compressor. The refrigerant gas discharged by the compressor flows into the condenser. The condenser condenses the compressed refrigerant into liquid phase, and the heat is released through the condensation process.

[0060] The throttling element expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into low-pressure liquid-phase refrigerant; the low-pressure liquid-phase refrigerant enters the evaporator to evaporate into refrigerant gas in a low-temperature and low-pressure state; and the refrigerant gas in the low-temperature and low-pressure state returns to the compressor. The low-pressure liquid-phase refrigerant absorbs heat during evaporation in the evaporator.

[0061] The indoor unit 2 further comprises a water heat exchanger connected with the condenser to convert the heat energy released by the condenser into water latent heat; the water heat exchanger comprises a water inlet and a water outlet.

[0062] The circulating water pump 3 is connected and communicated with the water outlet water circuit; a plurality of terminals 5 are connected in parallel through the water circuit pipeline; each terminal 5 is arranged in a plurality of heating spaces respectively, and is used for heating of each heating space. The terminal 5 can be implemented in various forms, such as floor heating, fan coil, etc.

[0063] Both ends of each terminal 5 connected in parallel are connected and communicated with the circulating water pump 3 and the water inlet water circuit respectively, forming a water circulation system, and the water circuit is driven to flow by the circulating water pump 3. That is, the circulating water pump 3 drives the hot water in the indoor unit 2 to enter each terminal 5, and the water is heated in each terminal 5 and then returns to the indoor unit 2 to exchange heat with the condenser. The indoor unit 2 further comprises an indoor control unit 21 for controlling the water temperature of the water circulation system.

[0064] The terminal 5 comprises a temperature control unit 6 for inputting a set temperature corresponding to the heating space; the set temperature is a target temperature that the heating space wants to reach. The indoor control unit 21 is communicatively connected with each temperature control unit 6 respectively, obtains the set temperature of each terminal 5, compares each set temperature, and obtains the maximum value in each set temperature, which is used to determine the set water temperature of the water circulation system, i.e., 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 outlet water temperature control.

[0065] 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 as to realize that the water temperature of the water circulation system is higher than the set temperature to supply heat for the heating space, achieve the purpose of heating, and can set the water temperature of the water circulation system to only meet the basic heating capacity, so that the water temperature of the water circulation system is as low as possible, and the purpose of energy saving is achieved. That is, the present application realizes that the set water temperature is low while meeting the requirements of all heating spaces on the heating capacity of each terminal 5 to reach the required set temperature; and the lower set water temperature reduces the operating frequency of the outdoor unit 1 as a whole, thereby realizing the energy saving of the heat pump air conditioning unit, reducing the heating cost, and protecting the environment.

[0066] The water temperature control method of the water circulation system of the heat pump air conditioning unit of the present application will be described in detail through specific embodiments.

[0067] In some specific embodiments, with reference to Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 The heat pump air conditioning unit further comprises a plurality of electric regulating valves 4, which can be controlled to change the opening degree and thus the amount of liquid or gas passing through; each electric regulating valve 4 is connected to the indoor control unit 21 and controlled by the indoor control unit 21 to change the opening degree; each electric regulating valve 4 is connected in series with each terminal 5 waterway, respectively located between each terminal 5 and the circulating water pump 3, for adjusting the water amount entering each corresponding terminal 5, and thus changing the heat exchange amount in the terminal 5 by changing the water amount to adjust the heating space temperature, temperature change speed and direction.

[0068] The indoor control unit 21 is provided with a start-up operation mode, a normal operation mode, and a limited time length. When the terminal 5 starts temperature control S11, the indoor control unit 21 controls the corresponding electric regulating valve 4 to enter the start-up operation mode S12; the indoor control unit 21 judges whether the running time of the temperature control unit 6 of the corresponding terminal 5 reaches the limited time length S13; when the running time of the temperature control unit 6 does not reach the limited time length, the indoor control unit 21 continues to run the start-up operation mode S12 to control the electric regulating valve 4; when the running time of the temperature control unit 6 reaches the limited time length, the indoor control unit 21 enters the normal operation mode S14 to control the electric regulating valve 4.

[0069] The terminal 5 further comprises 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.

[0070] In the start-up operation mode, the indoor control unit 21 controls the electric regulating valve 4 to run at the initial opening degree.

[0071] In the normal operation mode, the indoor control unit 21 performs the following steps: acquiring the set temperature and the indoor temperature of each corresponding terminal 5 by each temperature control unit 6 S41; calculating the difference between the set temperature and the indoor temperature S42, which is called the target difference ΔT; the indoor control unit 21 adjusts the opening degree of each corresponding electric regulating valve 4 according to each target difference ΔT.

[0072] The heat pump air conditioning unit of the present embodiment adjusts the opening degree of each electric regulating valve 4 through the target difference ΔT, changes the water amount to achieve the purpose of adjusting the indoor temperature, reduces the control frequency of the water temperature of the water circulation system, and makes it in a relatively stable and lower state; that is, when the indoor temperature adjustment can be solved by controlling the water amount, the water temperature setting is not changed, the outdoor unit 1 running frequency is reduced, and energy is saved.

[0073] In addition, in the start-up operation mode, the indoor control unit 21 controls the initial opening degree of the electric regulating valve 4 to be generally set to the full opening degree or a larger opening degree, so as to improve the speed of indoor temperature rise in the initial stage of heating space temperature control and improve the user experience.

[0074] In some specific embodiments, with reference to Figure 7 、 Figure 8 , the indoor control unit 21 is provided with a first adjustment period; and the adjustment frequency of the electric regulating valve 4 is controlled.

[0075] In the normal operation mode, the indoor control unit 21 performs the following steps: obtaining the set temperature and the indoor temperature of each terminal 5 in the temperature control state S41, calculating the corresponding target difference ΔT S42, and adjusting the opening degree of the corresponding electric regulating valve 4 according to the target difference ΔT.

[0076] That is, after obtaining the set temperature and the indoor temperature of each terminal 5 in the temperature control state S41 and adjusting the opening degree of the corresponding electric regulating valve 4 according to the calculated target difference ΔT, the indoor control unit 21 judges whether the timing of the first adjustment period is completed S46. If the timing of the first adjustment period is completed, the set temperature and the indoor temperature are obtained again S41, the target difference ΔT is calculated S42, and the opening degree of the electric regulating valve 4 is adjusted. If the timing of the first adjustment period is not completed, the next obtaining, calculating and adjusting are performed after waiting until the timing of the first adjustment period is completed.

[0077] The heat pump air conditioning unit of the present embodiment can set the size of the first adjustment period according to the water temperature change speed or the room temperature change speed caused by the system size and the set water flow, so as to make the heating space in the temperature comfort zone, save energy, and improve the user experience and comfort.

[0078] In some specific embodiments, the indoor control unit 21 controls the corresponding electric regulating valve 4 of the terminal 5 in the temperature control state to operate at the initial opening degree for a limited time during the operation of the indoor unit and the outdoor unit; that is, the indoor control unit 21 controls the electric regulating valve 4 to operate in the start-up operation mode.

[0079] When the terminal 5 completes the next first adjustment period of the start-up operation mode, the corresponding set temperature and indoor temperature are obtained, and the opening degree of the electric regulating valve 4 is adjusted according to the target difference ΔT.

[0080] In some specific embodiments, with reference to Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 , the heat pump air conditioning unit further comprises a plurality of electric regulating valves 4, which are respectively connected to the temperature control units 6 of the corresponding terminals 5 and are controlled by the corresponding temperature control units 6 to adjust the opening degree.

[0081] Each electric regulating valve 4 is connected in series with the water path of each terminal 5, and is located between each corresponding terminal 5 and the circulating water pump 3, for regulating the water amount entering the corresponding terminal 5.

[0082] Each temperature control unit 6 is provided with a start-up running mode, a normal running mode, and a limited time length. When the temperature control unit 6 corresponding to the terminal 5 starts temperature control S11, the start-up running mode S12 is run for the limited time length; in the start-up running mode, the temperature control unit 6 controls the corresponding electric regulating valve 4 to run at the initial opening degree. When the running time length of the start-up running mode reaches the limited time length, the normal running mode is entered.

[0083] That is, when the temperature control unit 6 enters the temperature control state, the start-up running mode S12 is started, and it is judged whether the running time length of the start-up running mode reaches the limited time length S13; if the running time length of the start-up running mode reaches the limited time length, the normal running mode is controlled to run S14; of course, if the running time length of the start-up running mode does not reach the running set time, the start-up running mode S12 is continuously maintained.

[0084] The terminal 5 further comprises a room temperature detection unit 51 connected with the temperature control unit 6, for detecting the indoor temperature of the heating and air conditioning and transmitting to the temperature control unit 6.

[0085] In the normal running mode, the temperature control unit 6 performs obtaining the set temperature and the indoor temperature S41, calculates the difference between the set temperature and the indoor temperature S42, defines it as the target difference ΔT, and adjusts the opening degree of the electric regulating valve 4 according to the target difference ΔT.

[0086] The heat pump air conditioning unit of the embodiment adjusts the opening degree of each electric regulating valve 4 through the target difference ΔT, changes the water amount to achieve the purpose of adjusting the indoor temperature, reduces the control frequency of the water circulation system water temperature, and makes it in a relatively stable and lower state; that is, when the indoor temperature adjustment can be solved by controlling the water amount, the water temperature setting is not changed, the outdoor unit 1 running frequency is reduced, and energy is saved.

[0087] In some specific embodiments, with reference to Figure 7 、 Figure 8 , the temperature control unit 6 is provided with a first adjustment period; for controlling the adjustment frequency of the electric regulating valve 4.

[0088] In the normal running mode, each temperature control unit 6 performs obtaining the set temperature and the indoor temperature according to the first adjustment period S41, calculates the corresponding target difference ΔT S42, and adjusts the opening degree of the corresponding electric regulating valve 4 according to the target difference ΔT.

[0089] That is, the temperature control unit 6 acquires the respective set temperatures and indoor temperatures, and adjusts the opening degree of the corresponding electric regulating valve 4 according to the calculated target difference ΔT, and then determines whether the timing of the first adjustment period is completed S46; if the timing of the first adjustment period is completed, the set temperature and the indoor temperature are acquired again S41, the target difference ΔT is calculated S42, and the opening degree of the electric regulating valve 4 is adjusted; if the timing of the first adjustment period is not completed, the next acquisition, calculation and adjustment are performed after waiting until the timing of the first adjustment period is completed. The determination of whether the timing of the first adjustment period is completed, the acquisition of the set temperature and the indoor temperature, the calculation of the target difference ΔT, and the adjustment of the opening degree of the electric regulating valve are cyclically performed.

[0090] The indoor control unit 21 of the heat pump air conditioning unit of the embodiment can set the size of the first adjustment period according to the different system size, the water temperature change speed or the room temperature change speed caused by the set water volume, so that the heating space is in the temperature comfort zone, and the user experience and comfort are improved while saving energy.

[0091] In some specific embodiments, when the heat pump air conditioning unit is running, the temperature control unit 6 of the newly added terminal 5 controls the electric regulating valve 4 to operate at the initial opening degree for a limited time, and adjusts the opening degree of the electric regulating valve 4 through the target difference ΔT after the running time reaches the limited time.

[0092] In some specific embodiments, with reference to Figure 1 、 Figure 5 、 Figure 6 、 Figure 8 , the indoor control unit 21 is provided with a second adjustment period for adjusting the frequency of the set water temperature of the water circulation system.

[0093] When the control of the electric regulating valve 4 corresponding to each terminal 5 is in the starting operation mode, the indoor control unit 21 acquires the set temperature of each terminal 5 S21, compares each set temperature to obtain the maximum set temperature S22, and determines the set water temperature of the water circulation system according to the maximum set temperature. The period of acquiring the set temperature and determining the set water temperature is the second adjustment period.

[0094] That is, after acquiring 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 period is completed; if it is completed, the next acquisition of each set temperature, comparison of each set temperature, and determination of the set water temperature are performed; if it is not completed, the next acquisition, comparison, and determination of the set water temperature are performed after waiting until it is completed. The subsequent cycle determines whether the timing of the second adjustment period is completed, and acquires each set temperature, compares each set, and determines the set water temperature.

[0095] When the control of each terminal 5 corresponding electric regulating valve 4 is in normal operation mode, the indoor control unit 21 obtains the opening degree of each electric regulating valve 4, i.e. opening step S31 according to the second adjustment cycle; the indoor control unit 21 compares the obtained opening degree of each electric regulating valve 4 S32, obtains the electric regulating valve 4 with the largest opening degree and the set temperature of the terminal 5 corresponding to each electric regulating valve 4 with the largest opening degree S21; compares each set temperature to obtain the maximum value of each set temperature S22, which is called the maximum set temperature; and determines the set water temperature of the water circulation system according to the maximum set temperature S23.

[0096] That is, the indoor control unit 21 performs the obtaining of the opening degree of each electric regulating valve 4 S31, the comparison of the opening degree of each electric regulating valve 4, the obtaining of the electric regulating valve 4 with the largest opening degree S32, the obtaining of the set temperature of the terminal 5 corresponding to each electric regulating valve 4 with the largest opening degree S21, the comparison of each set temperature to obtain the maximum set temperature S22, and the determination of the set water temperature of the water circulation system according to the maximum set temperature S23. After the above control is completed, it is judged whether the timing of the second adjustment cycle is completed S24. If it is completed, the next obtaining of the opening degree of each electric regulating valve 4 S31, the comparison of the opening degree of each electric regulating valve 4, the obtaining of the set temperature of the terminal 5 corresponding to the electric regulating valve 4 with the largest opening degree S32, the obtaining of the maximum set temperature S22, and the determination of the set water temperature of the water circulation system S23 are performed. If the timing of the second adjustment cycle is not completed, it is continued to wait until it is completed, and then the next obtaining, comparison and determination of the set water temperature are performed.

[0097] The heat pump air conditioning unit of the embodiment controls the opening degree of each terminal 5 corresponding electric regulating valve 4 through the target difference ΔT to control the water flow, so as to control the indoor temperature of different heating spaces to reach the set temperature of the user, and the maximum value of the set temperature of the terminal 5 corresponding to the electric regulating valve 4 with the largest opening step is taken as the basis for determining the set water temperature of the water circulation system, so as to realize that the heat pump air conditioning unit reduces the set water temperature of the water circulation system as much as possible under the condition of meeting the indoor temperature adjustment of each independent heating space, reduces the operating frequency of the heat pump unit, and realizes the energy saving of the overall system.

[0098] In some specific embodiments, when there are electric regulating valves 4 under normal operation mode control and electric regulating valves 4 under start operation mode control, the electric regulating valves 4 running at initial opening degree and their corresponding terminals 5 participate in the comparison of opening degree and the comparison of set temperature. That is, when there are electric regulating valves 4 under normal operation mode control and electric regulating valves 4 under start operation mode control, the opening degree S31 of the electric regulating valve 4 corresponding to each terminal 5 under temperature control is obtained; the opening degree of each electric regulating valve 4 is compared to obtain the electric regulating valve 4 with the largest opening degree value S32; the set temperature of the terminal 5 corresponding to each electric regulating valve 4 with the largest opening degree value is compared to obtain the maximum set temperature S21 in each set temperature, which is used to determine the set water temperature S23 of the water circulation system.

[0099] In some specific embodiments, referring to Figure 8 , the first adjustment period is equal to the second adjustment period; then the adjustment of the opening degree of the electric regulating valve 4 is performed first, and then the determination of the set water temperature of the water circulation system is performed according to the adjustment result of the opening degree of the electric regulating valve 4.

[0100] Specifically, the indoor temperature and the set temperature are obtained n times S41; the target difference ΔT between the set temperature and the indoor temperature is calculated S42; the opening degree of the electric regulating valve 4 is adjusted according to the target difference ΔT; the opening degree of each electric regulating valve 4 is obtained S31; the opening degree of each electric regulating valve 4 is compared; the set temperature S21 of the terminal 5 corresponding to the electric regulating valve 4 with the maximum opening degree value S32 is obtained; each set temperature is compared; the maximum set temperature S22 is obtained, which is used to determine the set water temperature S23 of the water circulation system.

[0101] It is judged whether the timing of the first adjustment period is completed S46, if yes, the indoor temperature and the set temperature are obtained n+1 times S41, and the opening degree of the electric regulating valve 4 is adjusted according to the target difference ΔT and the determination of the set water temperature of the water circulation system is performed; if not, the waiting is continued until the timing of the first adjustment period is completed and then the obtaining, adjusting and determining are performed n+1 times.

[0102] In some specific embodiments, the first adjustment period is less than the second adjustment period, and the second adjustment period is an integer multiple of the first adjustment period; that is, the adjustment of the opening degree of the electric regulating valve 4 is performed multiple times, and the determination of the set water temperature is performed once (adjustment).

[0103] In some specific embodiments, referring to Figure 6When the opening degrees of the electric regulating valves 4 are compared, the number of the electric regulating valves 4 with the maximum opening degree can be one or more; it is determined whether the number of the electric regulating valves with the maximum opening degree is greater than one S33; when the number of the electric regulating valves 4 with the maximum opening degree is one, the set water temperature of the water circulation system is determined according to the set temperature of the terminal 5 corresponding to the electric regulating valve 4 with the maximum opening degree S25; when the number of the electric regulating valves 4 with the maximum opening degree is more than one, the set temperatures of the terminals 5 corresponding to the electric regulating valves 4 are obtained, and the set temperatures are compared to obtain the maximum set temperature S22, which is used as the basis for determining the set water temperature of the water circulation system.

[0104] In some specific embodiments, the correction value is calculated according to the following formula: Figure 5 、 Figure 6 、 Figure 8 The set water temperature of the water circulation system in step S23 is the sum of the maximum set temperature and the correction value.

[0105] The indoor unit 2 further comprises 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 detecting the water temperature at the water outlet and the water temperature at the water inlet, obtaining the outlet water temperature and the inlet water temperature, and transmitting the obtained outlet water temperature and inlet water temperature to the indoor control unit 21.

[0106] The correction value is the difference between the average of the inlet water temperature and the outlet water temperature and the indoor temperature.

[0107] That is, Tws=Trs_max+(Ti+To) / 2-Tr;

[0108] wherein Tws is the set water temperature of the water circulation system;

[0109] Trs_max is the maximum set temperature;

[0110] Trs is the set temperature;

[0111] Ti is the inlet water temperature;

[0112] To is the outlet water temperature;

[0113] Tr is the indoor temperature.

[0114] In some specific embodiments, the correction value ranges from 2 to 10℃.

[0115] That is, when the correction value calculated by the formula (Ti+To) / 2-Tr is less than 2℃, the correction value is taken as 2℃; when the calculated correction value is greater than 10℃, the correction value is taken as 10℃. This prevents the set water temperature from changing too much and improves the energy-saving level.

[0116] In some specific embodiments, the correction value is calculated according to the following formula: Figure 7 、9 , 10, the specific content of the adjustment of the electric regulating valve 4 according to the target difference ΔT is as follows.

[0117] The judgment target difference ΔT is executed S43; when the target difference ΔT is positive, the opening of the electric regulating valve 4 is increased S44, and the adjustment amplitude increases stepwise with the increase of the target difference ΔT.

[0118] When the target difference ΔT is negative, the opening of the electric regulating valve 4 is decreased S45, and the adjustment amplitude decreases stepwise with the increase of the target difference ΔT.

[0119] The heat pump air conditioning unit of the embodiment reduces the control difficulty and improves the control efficiency and precision by adopting the stepwise change of the opening adjustment value of the electric regulating valve 4 with the target difference ΔT.

[0120] Referring to Figure 9 , Figure 10 The adjustment mode of the opening of the electric regulating valve 4 is exemplarily 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 the function value of the adjustment opening step Ft derived from the target difference ΔT.

[0121] That is, if the target difference ΔT is located between adjacent positive reference values, the opening of the electric regulating valve 4 is increased by one positive adjustment opening step Ft corresponding to the function value; if the target difference ΔT is located between adjacent negative reference values, the opening of the electric regulating valve 4 is decreased by the absolute value of one negative adjustment opening step Ft corresponding to the function value.

[0122] Specifically, the positive reference values are set as a, b, c, d, e, and the negative reference values are set as -a, -b, -c, -d, -e; the positive adjustment opening steps Ft are set as n1, n2, n3, n4, n5, and the negative adjustment opening steps Ft are set as -n1, -n2, -n3, -n4, -n5.

[0123] When the target difference ΔT is located between 0 and a, the opening of the electric regulating valve 4 is increased by n1, and when the target difference ΔT is 0, it is increased by n1; when the target difference ΔT is a, it is increased by n2; when the target difference ΔT is located between a and b, the opening of the electric regulating valve 4 is increased by n2, and when the target difference ΔT is b, it is increased by n3; when the target difference ΔT is located between b and c, the opening of the electric regulating valve 4 is increased by n3, and when the target difference ΔT is c, it is increased by n4; when the target difference ΔT is located between c and d, the opening of the electric regulating valve 4 is increased by n4, and when the target difference ΔT is d, it is increased by n5; when the target difference ΔT is located between d and e or greater than e, the opening of the electric regulating valve 4 is increased by n5.

[0124] When the target difference ΔT is between 0 and -a, the opening of the electric regulating valve 4 is not adjusted; when the target difference ΔT is between -a and -b and equal to -a, the opening of the electric regulating valve 4 is reduced by n1, and when the target difference ΔT is b, the opening is reduced by n2; when the target difference ΔT is between -b and -c, the opening of the electric regulating valve 4 is reduced by n2, and when the target difference ΔT is -c, the opening is reduced by n3; when the target difference ΔT is between -c and -d, the opening of the electric regulating valve 4 is reduced by n3, and when the target difference ΔT is -d, the opening is reduced by n4; when the target difference ΔT is between -d and -e, the opening of the electric regulating valve 4 is reduced by n4; when the target difference ΔT is -e and less than -e, the opening of the electric regulating valve 4 is reduced by n5.

[0125] a, b, c, d, e are between 0.1℃ and 5℃. n1, n2, n3, n4, n5 are set according to the opening of the electric regulating valve 4.

[0126] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0127] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A heat pump air conditioning unit, comprising: The outdoor unit is used to provide refrigerant heat energy; An indoor unit, which is connected to the outdoor unit, converts the refrigerant's thermal energy into latent heat of water, and includes a water inlet and a water outlet; the indoor unit also includes an indoor control unit. A circulating water pump, which is connected to the outlet; Multiple ends; It is connected in parallel through water pipes and is installed in multiple heating spaces for heating each of the heating spaces; the two ends of each of the parallel terminals are respectively connected and communicated with the circulating water pump and the water inlet; the connection of the indoor unit, the circulating water pump and each of the terminals forms a water circulation system; The feature is that it further includes multiple electrically adjustable valves, which are respectively connected to the indoor control unit and whose opening degree is controlled by the indoor control unit; each of the electrically adjustable valves is located between each of the ends and the circulating water pump, and is used to adjust the amount of water entering each of the ends; The terminal includes a temperature control unit for inputting the set temperature of the heated space; the terminal also includes a room temperature detection unit connected to the temperature control unit for detecting the indoor temperature of the heated space and transmitting it to the temperature control unit. The indoor control unit is communicatively connected to each of the temperature control units, and is equipped with a start-up operation mode, a normal operation mode, a first adjustment cycle, and a second adjustment cycle. In the startup operation mode, the indoor control unit controls the electric regulating valve to operate at the initial opening degree; In the normal operating mode, the indoor control unit obtains the set temperature and the indoor temperature corresponding to each of the terminals according to the first adjustment cycle, calculates the difference between the set temperature and the indoor temperature, which is called the target difference, and adjusts the opening degree of each of the electric regulating valves according to each target difference. The indoor control unit obtains the opening degree of the electric regulating valve and the set temperature of each of the terminals in the normal operation mode according to the second adjustment cycle; The indoor control unit compares the opening degree of each of the electric regulating valves, obtains the opening degree of the electric regulating valve with the largest value, and obtains the set temperature of each terminal corresponding to the electric regulating valve with the largest value; compares each set temperature, and sets the set water temperature of the indoor unit according to the maximum value of the set temperature.

2. The heat pump air conditioning unit according to claim 1, characterized in that, The indoor control unit is also set with a limited time period, and the start-up mode is set to run when the start-up time is within the limited time period, and the normal operation mode is set when the limited time period is reached.

3. The heat pump air conditioning unit according to claim 1, characterized in that, The first adjustment period is equal to the second adjustment period.

4. The heat pump air conditioning unit according to any one of claims 1 to 3, characterized in that, When the target difference is positive, the opening of the electric regulating valve is increased, and the adjustment range increases stepwise as the target difference increases. When the target difference is negative, the opening of the electric regulating valve is reduced, and the adjustment range decreases stepwise as the target difference increases.

5. The heat pump air conditioning unit according to claim 4, 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 also includes 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 at the outlet and the water temperature at the inlet, obtain the outlet water temperature and the inlet water temperature, and transmit the obtained outlet water temperature and inlet water temperature to the indoor control unit. The correction value is the difference between the average temperature of the outlet water temperature and the inlet water temperature and the indoor temperature.

6. The heat pump air conditioning unit according to claim 5, characterized in that, The range of the correction value is 2~10℃.

7. A heat pump air conditioning unit, comprising: The outdoor unit is used to provide refrigerant heat energy; An indoor unit, which is connected to the outdoor unit, converts the refrigerant's thermal energy into latent heat of water, and includes a water inlet and a water outlet; the indoor unit also includes an indoor control unit. A circulating water pump, which is connected to the outlet; Multiple ends; It is connected in parallel through water pipes and is installed in multiple heating spaces for heating each of the heating spaces; the two ends of each of the parallel terminals are respectively connected and communicated with the circulating water pump and the water inlet; the connection of the indoor unit, the circulating water pump and each of the terminals forms a water circulation system; The feature is that it further includes multiple electrically adjustable valves, which are respectively located between each of the terminals and the circulating water pump, for adjusting the water volume entering each of the terminals; each terminal includes a temperature control unit for inputting the set temperature of the heating space; each of the electrically adjustable valves is connected to the temperature control unit, and the opening degree is controlled by the temperature control unit; each terminal also includes 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; the indoor control unit is communicatively connected to each of the temperature control units. Each of the temperature control units is equipped with a start-up mode, a normal operation mode, a limited duration, and a first adjustment cycle; and controls the terminal to start and operate in the start-up mode within the limited duration, and enters the normal operation mode when the start-up reaches the limited duration; In the startup operation mode, the temperature control unit controls the electric regulating valve to operate at the initial opening degree; In the normal operating 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; In the normal operating mode, the temperature control unit obtains the set temperature and the indoor temperature according to the first adjustment cycle, calculates the target difference, and adjusts the opening of the electric regulating valve according to the target difference; The indoor control unit is provided with a second adjustment cycle; the indoor control unit obtains the opening degree of the electric regulating valve and the set temperature of each terminal in the normal operation mode according to the second adjustment cycle; the indoor control unit compares the opening degree of each electric regulating valve, obtains the opening degree of the electric regulating valve with the largest value, and obtains the set temperature of each terminal corresponding to the electric regulating valve with the largest value; compares each set temperature, and sets the set water temperature of the indoor unit according to the maximum value of the set temperature.

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

9. The heat pump air conditioning unit according to claim 7 or 8, characterized in that, When the target difference is positive, the opening of the electric regulating valve is increased, and the adjustment range increases stepwise as the target difference increases. When the target difference is negative, the opening of the electric regulating valve is reduced, and the adjustment range decreases stepwise as the target difference increases.

10. The heat pump air conditioning unit according to claim 9, 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 also includes 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 at the outlet and the water temperature at the inlet, obtain the outlet water temperature and the inlet water temperature, and transmit the obtained outlet water temperature and inlet water temperature to the indoor control unit. The correction value is the difference between the average temperature of the outlet water temperature and the inlet water temperature and the indoor temperature.

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