Variable-frequency air source heat pump and variable-frequency adjusting method and device thereof

Abstract

The invention relates to the technical field of air source heat pumps, and discloses a variable-frequency air source heat pump and a variable-frequency adjusting method and device thereof. The energy-saving working condition frequency table is generated in advance, the preset frequency which is automatically set in advance is adaptively adjusted according to the target frequency in the energy-saving working condition frequency table in combination with the current environment temperature, and the target water temperature is adaptively corrected in combination with the preset temperature control condition on the basis that the preset frequency is adjusted to the target frequency. And finally, on the basis that the target water temperature is corrected, the target frequency is corrected in a self-adaptive mode. Therefore, the preset water temperature is corrected to the target water temperature in a self-adaptive mode, manual correction of the preset water temperature by a user is replaced, then the purpose of accurate temperature control is achieved, the user requirement is met, meanwhile, the target frequency is corrected in a self-adaptive mode in combination with the high-frequency heating time and the load correction time, and the user experience is improved. And the phenomena of high energy consumption and high noise caused by the fact that the variable-frequency air source heat pump always works according to the heating frequency of a non-ideal state are avoided, and the stability is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air source heat pump, in particular to a variable frequency air source heat pump and a variable frequency adjusting method and device thereof. BACKGROUND

[0002] With the promotion of energy saving and emission reduction, air source heat pump has been popularized in a wide range in China, especially in the northern heating market, and has basically realized variable frequency application.

[0003] In the related art, variable frequency adjustment mainly takes water temperature as a control target, and indirectly adjusts indoor temperature by adjusting the preset water temperature to achieve the effect of heating. However, the method requires users to actively correct the preset water temperature many times according to the actual environmental temperature experience, resulting in inaccurate temperature control, which cannot meet the user's demand. In addition, if the variable frequency air source heat pump is heated at high frequency or at low frequency according to the inaccurate preset water temperature, the variable frequency air source heat pump will work at a non-ideal heating frequency, which is prone to high energy consumption and high noise, thereby affecting the user experience. SUMMARY

[0004] Therefore, the present application provides a variable frequency air source heat pump and a variable frequency adjusting method and device thereof to solve the problem that the variable frequency adjustment method in the related art cannot meet the user's demand and is prone to high energy consumption and high noise, thereby affecting the user experience.

[0005] According to a first aspect, the present application provides a variable frequency adjusting method of a variable frequency air source heat pump, the method comprising: In response to the start of the variable frequency air source heat pump, setting a preset water temperature and a preset ambient temperature, and controlling the compressor to operate at a rated frequency for a preset time, collecting the current water temperature and the current ambient temperature of the variable frequency air source heat pump; According to the current ambient temperature, adjusting the rated frequency by a target frequency in an energy-saving operating frequency table, wherein the energy-saving operating frequency table is generated according to a plurality of preset upper limit frequencies, or the energy-saving operating frequency table is generated according to a plurality of preset lower limit frequencies, each preset upper limit frequency is determined according to a corresponding preset ambient temperature and a preset water temperature, and each preset lower limit frequency corresponds to a preset ambient temperature; Controlling the compressor to operate at the target frequency, and under the preset temperature control condition, correcting the preset water temperature to a target water temperature according to the preset water temperature, the preset ambient temperature, the current water temperature and the current ambient temperature; If the variable frequency air source heat pump works at the target water temperature, correcting the target frequency according to a high-frequency heating time and a load correction time.

[0006] The application pre-generates an energy-saving working condition frequency table, and adjusts the preset frequency set automatically in advance adaptively according to the target frequency in the energy-saving working condition frequency table and the current ambient temperature, and on the basis of the preset frequency being adjusted to the target frequency, the target water temperature is adaptively corrected in combination with the preset temperature control condition, some preset parameters and the current detection parameters, and finally on the basis of the target water temperature being corrected, the target frequency is adaptively corrected in combination with some preset parameters and the current detection parameters for saving energy. Therefore, the preset water temperature is corrected to the target water temperature in an adaptive mode, the preset water temperature is manually corrected by the user, and the purpose of accurate temperature control is achieved, the user demand is met, and the target frequency is adaptively corrected in combination with the high-frequency heating time and the load correction time, so that the variable frequency air source heat pump does not work at the non-ideal heating frequency, the high energy consumption and high noise phenomenon is avoided, and the stability is good.

[0007] In some optional embodiments, the current water temperature includes a current return water temperature, the current ambient temperature includes a current outdoor ambient temperature, the preset ambient temperature includes a preset outdoor ambient temperature, the preset water temperature includes a preset return water temperature, each preset upper limit frequency is determined according to the corresponding preset outdoor ambient temperature and preset return water temperature, and the rated frequency is adjusted according to the target frequency in the energy-saving working condition frequency table according to the current ambient temperature, including: selecting the preset outdoor ambient temperature matching the current outdoor ambient temperature from the energy-saving working condition frequency table; selecting the preset return water temperature matching the current return water temperature from the energy-saving working condition frequency table; determining the preset upper limit frequency corresponding to the preset outdoor ambient temperature and the preset return water temperature, and taking the preset upper limit frequency as the target frequency; judging whether the rated frequency is greater than the target frequency; if yes, adjusting the rated frequency to the target frequency; if no, taking the rated frequency as the target frequency.

[0008] According to the above embodiments, the preset outdoor ambient temperature matching the current outdoor ambient temperature is selected from the energy-saving working condition frequency table, and the preset return water temperature matching the current return water temperature is selected from the energy-saving working condition frequency table. That is, the preset upper limit frequency matching the current outdoor ambient temperature and the current return water temperature is selected as the target frequency from the energy-saving working condition frequency table, and the rated frequency is adjusted according to the target frequency, so as to flexibly adjust the variable frequency air source heat pump according to the preset upper limit frequency.

[0009] In some optional embodiments, the plurality of preset lower limit frequencies comprises a first preset lower limit frequency, a second preset lower limit frequency and a third preset lower limit frequency, the preset ambient temperature comprises a preset outdoor ambient temperature, and the current ambient temperature comprises a current outdoor ambient temperature. Each preset lower limit frequency corresponds to a preset outdoor ambient temperature. According to the current ambient temperature, the rated frequency is adjusted by the target frequency in the energy-saving operating condition frequency table: If the current outdoor ambient temperature is less than the preset outdoor ambient temperature corresponding to the first preset lower limit frequency, the first preset lower limit frequency is selected from the energy-saving operating condition frequency table as the target frequency. It is judged whether the rated frequency is greater than the preset outdoor ambient temperature corresponding to the first preset lower limit frequency. If yes, the rated frequency is adjusted to the first preset lower limit frequency. If no, the rated frequency is taken as the target frequency. If the current outdoor ambient temperature is greater than or equal to the preset outdoor ambient temperature corresponding to the third preset lower limit frequency, the third preset lower limit frequency is selected from the energy-saving operating condition frequency table as the target frequency. It is judged whether the rated frequency is greater than the third preset lower limit frequency. If yes, the rated frequency is adjusted to the third preset lower limit frequency. If no, the rated frequency is taken as the target frequency. If the current outdoor ambient temperature is greater than or equal to the preset outdoor ambient temperature corresponding to the first preset lower limit frequency and less than the second preset outdoor ambient temperature, a first adjusted frequency is calculated according to the first preset linear formula based on the first preset lower limit frequency and the second preset lower limit frequency, and the first adjusted frequency is taken as the target frequency. It is judged whether the rated frequency is greater than or equal to the target frequency. If yes, the rated frequency is adjusted to the target frequency. If no, the rated frequency is taken as the target frequency. If the current outdoor ambient temperature is greater than or equal to the preset outdoor ambient temperature corresponding to the second preset lower limit frequency and less than the preset outdoor ambient temperature corresponding to the third preset lower limit frequency, a second adjusted frequency is calculated according to the second preset linear formula based on the second preset lower limit frequency and the third preset lower limit frequency, and the second adjusted frequency is taken as the target frequency. It is judged whether the rated frequency is greater than the second adjusted frequency. If yes, the rated frequency is adjusted to the second adjusted frequency. If no, the rated frequency is taken as the target frequency.

[0010] In the above embodiments, the current outdoor ambient temperature is compared with a plurality of different preset outdoor ambient temperatures from the energy-saving operating condition frequency table, the best lower limit frequency matched with the current outdoor ambient temperature is determined as the target frequency, and the rated frequency is adjusted according to the target frequency, so that the variable frequency air source heat pump can be flexibly adjusted according to the preset lower limit frequency.

[0011] In some optional embodiments, the current ring temperature includes a current indoor ring temperature, the preset temperature control condition includes a first preset temperature control condition, a second preset temperature control condition and a third preset temperature control condition, and under the preset temperature control condition, the preset water temperature is corrected to the target water temperature according to the preset water temperature, the preset ring temperature, the current water temperature and the current ring temperature, including: Under the first preset temperature control condition, if the load is full load and the current indoor ring temperature meets the temperature comfort condition, the target water temperature is controlled to be equal to the preset water temperature.

[0012] Under the second preset temperature control condition, if the load is light load, the preset water temperature is set to be higher than the current water temperature, and the current indoor ring temperature meets the temperature comfort condition, the heat pump is controlled to perform a frequency reduction heating action. Under the third preset temperature control condition, if the load is overload and the preset water temperature is set to be lower than the current water temperature, the preset water temperature is corrected to the target water temperature according to the preset ring temperature, the current indoor ring temperature and a plurality of room temperature correction coefficients.

[0013] The present application can adaptively correct the preset water temperature value to the target water temperature according to the load state and the temperature comfort condition, combine some current detection parameters and preset parameters, achieve the purpose of flexible temperature control, and also ensure the accuracy and efficiency of temperature control, and can also save energy.

[0014] In some optional embodiments, under the third preset temperature control condition, during the process of correcting the preset water temperature to the target water temperature, if the current indoor ring temperature is less than the water temperature lower threshold, the target water temperature is re-corrected according to the preset algorithm until the re-corrected target water temperature reaches the water temperature upper threshold, and the heat pump is controlled to perform a stop action.

[0015] The present application can not only achieve precise temperature control, but also achieve the purpose of saving energy.

[0016] In some optional embodiments, if the variable frequency air source heat pump works according to the target outlet water temperature, the target frequency is corrected according to the high-frequency heating time and the load correction time, including: If the high-frequency heating time is greater than or equal to the load correction time, the plurality of preset upper limit frequencies in the energy-saving working condition frequency table are corrected according to the first frequency correction parameter. If the high-frequency heating time is less than the load correction time, the plurality of preset upper limit frequencies in the energy-saving working condition frequency table are corrected according to the second frequency correction parameter.

[0017] The application is according to the preset temperature control condition, according to the preset water temperature, the preset ambient temperature, the current water temperature and the current ambient temperature, and the target water temperature is corrected adaptively, and then the target frequency is corrected comprehensively according to the high-frequency heating time and the load correction time, so that the load can run in the best state, and the purpose of saving energy consumption is achieved.

[0018] In a second aspect, the application provides a variable frequency air source heat pump, comprising: An outdoor ambient temperature sensor is configured to detect a current outdoor ambient temperature in the current ambient temperature; A controller is configured to execute the variable frequency adjustment method of the variable frequency air source heat pump in the first aspect or any of the embodiments of the first aspect; An indoor temperature controller is configured to detect a current indoor ambient temperature in the current ambient temperature, and send a first control signal to the controller according to the preset ambient temperature; A buffer water tank is installed on a pipeline at the end of the variable frequency air source heat pump, and is configured to store water; An exhaust valve is installed at the top of the buffer water tank, and is configured to exhaust gas of the variable frequency air source heat pump; An outlet water temperature sensor is installed on an outlet water pipeline, and is configured to detect a current outlet water temperature in the current water temperature, and send a second control signal to the controller according to the current outlet water temperature; A return water temperature sensor is installed on a return water pipeline, and is configured to detect a current return water temperature in the current water temperature, and send a third control signal to the controller according to the current return water temperature; A condenser is configured to condense gaseous refrigerant at a first gas pressure temperature into gaseous refrigerant at a second gas pressure temperature, so as to transfer heat to water in the pipeline, wherein the first gas pressure temperature is higher than the second gas pressure temperature; A compressor is configured to compress gaseous refrigerant at a third gas pressure temperature into gaseous refrigerant at the first gas pressure temperature, wherein the third gas pressure temperature is less than the second gas pressure temperature; An evaporator is configured to absorb energy of air, and evaporate liquid refrigerant at the third gas pressure temperature into liquid refrigerant at the first gas pressure temperature; A fan assembly is configured to drive surrounding air to flow through the evaporator under the driving of a motor, so as to provide continuous air energy for the evaporator; An expansion valve is configured to change liquid refrigerant at the second gas pressure temperature into liquid refrigerant at the third gas pressure temperature through throttling function; An economizer is configured to recycle residual heat of the variable frequency air source heat pump; A heat exchanger is installed at the end of the pipeline, and is configured to transfer the temperature of hot water to indoor air, so as to improve the current indoor ambient temperature, and the current indoor ambient temperature meets the temperature suitable condition of the indoor; A control valve is arranged in front of the heat exchanger to control the start and stop of the heat exchanger. A water pump is arranged to drive the water in the pipeline to circulate, so that the water absorbs the energy of the refrigerant in the condenser to be heated, and is brought to the heat exchanger to release heat, so that the current indoor ambient temperature rises to achieve the purpose of indoor heating.

[0019] In a third aspect, the present application provides a variable frequency adjustment device of a variable frequency air source heat pump, which comprises: A parameter acquisition module is configured to, in response to the start of the variable frequency air source heat pump, set a preset water temperature and a preset ambient temperature, and control the compressor to operate at a rated frequency for a preset time, and then acquire a current water temperature and a current ambient temperature of the variable frequency air source heat pump. A frequency adjustment module is configured to adjust the rated frequency by a target frequency in an energy-saving working condition frequency table according to the current ambient temperature, wherein the energy-saving working condition frequency table is generated according to a plurality of preset upper limit frequencies, or the energy-saving working condition frequency table is generated according to a plurality of preset lower limit frequencies, each preset upper limit frequency is determined according to a corresponding preset ambient temperature and a preset water temperature, and each preset lower limit frequency corresponds to a preset ambient temperature. A water temperature correction module is configured to control the compressor to operate at the target frequency, and correct the preset water temperature to a target water temperature according to the preset water temperature, the preset ambient temperature, the current water temperature and the current ambient temperature under a preset temperature control condition. A frequency correction module is configured to correct the target frequency according to a high-frequency heating time and a load correction time if the variable frequency air source heat pump works at the target water temperature.

[0020] In a fourth aspect, the present application provides a computer device, which comprises a memory and a processor, the memory and the processor are communicatively connected, the memory stores computer instructions, and the processor executes the computer instructions to perform the variable frequency adjustment method of the variable frequency air source heat pump of the first aspect or any of the corresponding embodiments thereof.

[0021] In a fifth aspect, the present application provides a computer readable storage medium, which stores computer instructions, and the computer instructions are used to make a computer execute the variable frequency adjustment method of the variable frequency air source heat pump of the first aspect or any of the corresponding embodiments thereof. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0023] Figure 1 is a structural block diagram of a variable frequency air source heat pump according to an embodiment of the present application; Figure 2 is a flowchart of a variable frequency regulation method of a variable frequency air source heat pump according to an embodiment of the present application; Figure 3 is a schematic diagram of a lower limit table of energy-saving operating frequency in an energy-saving operating frequency table according to an embodiment of the present application; Figure 4 is a structural block diagram of a variable frequency regulation device of a variable frequency air source heat pump according to an embodiment of the present application; Figure 5 is a hardware structure schematic diagram of a computer device of an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of 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 protection scope of the present application.

[0025] As an optional application scenario of the embodiments of the present application, as shown in Figure 1 The embodiments of the present application provide a variable frequency air source heat pump, which comprises an outdoor ambient temperature sensor 10, a controller 11, an indoor temperature controller 12, a buffer water tank 13, an exhaust valve 14, an outlet water temperature sensor 15, a return water temperature sensor 16, a condenser 17, a compressor 18, an evaporator 19, a fan assembly 20, an expansion valve 21, an economizer 22, a heat exchanger 23, a control valve 24 and a water pump 25.

[0026] The outdoor ambient temperature sensor is used to detect a current outdoor ambient temperature in a current ambient temperature.

[0027] The controller is used to execute the variable frequency regulation method of the variable frequency air source heat pump described below.

[0028] The indoor temperature controller is used to detect a current indoor ambient temperature in the current ambient temperature, and send a first control signal to the controller according to a preset ambient temperature.

[0029] Specifically, the indoor temperature controller is internally provided with a sensing element and a storage medium. The indoor temperature controller is used to detect the current indoor ambient temperature, and send a corresponding first control signal to the controller according to a preset ambient temperature preset in advance. The communication mode between the indoor temperature controller and the variable frequency air source heat pump includes a wired communication mode and a wireless communication mode. The wired indoor temperature controller is generally fixedly installed on a wall, and the wireless indoor temperature controller can be placed on a desktop or the like and can be used as a decoration.

[0030] The buffer water tank is installed on the pipeline at the end of the variable frequency air source heat pump, and is used to store water.

[0031] Specifically, the buffer water tank is installed on the pipeline at the end of the variable frequency air source heat pump. Since the water tank has a certain capacity, the buffer water tank can achieve a certain effect to some extent, and inhibit the unstable state of the water temperature caused by the switching on and off or defrosting of the variable frequency air source heat pump.

[0032] The exhaust valve is installed at the top of the buffer water tank, and is used to exhaust the gas of the variable frequency air source heat pump.

[0033] Specifically, the exhaust valve is an automatic exhaust valve, which is a device that only exhausts gas but does not exhaust water. It is installed at the top of the buffer water tank, and is used to exhaust the air of the variable frequency air source heat pump, improve the reliability of the water pump, and enhance the heat exchange efficiency of the heat exchanger.

[0034] The water outlet temperature sensor is installed on the water outlet pipeline, and is used to detect the current water outlet temperature in the current water temperature, and send a second control signal to the controller according to the current water outlet temperature.

[0035] Specifically, the water outlet temperature sensor is a resistance type temperature sensor, which is installed on the water outlet pipeline, and is used to detect the current water outlet temperature and convert the current water outlet temperature into a second control signal transmitted to the controller for calculation by the controller.

[0036] The return water temperature sensor is installed on the return water pipeline, and is used to detect the current return water temperature in the current water temperature, and send a third control signal to the controller according to the current return water temperature.

[0037] The return water temperature sensor is a resistance type temperature sensor, which is installed on the return water pipeline, and is used to detect the current return water temperature and convert the current return water temperature into a third control signal transmitted to the controller for calculation by the controller.

[0038] The condenser is used to condense the gaseous refrigerant at a first gas pressure temperature into gaseous refrigerant at a second gas pressure temperature to perform heat transfer on the water in the pipeline, wherein the first gas pressure temperature is higher than the second gas pressure temperature.

[0039] Specifically, the first gas pressure temperature is high temperature and high pressure, and the second gas pressure temperature is medium temperature and high pressure. The condenser is one of the four major components of the refrigeration system, which is a device for condensing high-temperature and high-pressure gaseous refrigerant into medium-temperature and high-pressure liquid refrigerant and transferring heat to water. It mainly includes plate heat exchanger, shell and tube heat exchanger, and sleeve heat exchanger.

[0040] The compressor is used to compress the gaseous refrigerant at the third gas pressure temperature into the gaseous refrigerant at the first gas pressure temperature, wherein the third gas pressure temperature is less than the second gas pressure temperature.

[0041] Specifically, the third gas pressure temperature is low temperature and low pressure, the first gas pressure temperature is high temperature and high pressure, and the second gas pressure temperature is medium temperature and high pressure. The compressor is also one of the four major components of the refrigeration system, and the variable speed compressor has small heating capacity at low speed and large heating capacity at high speed. A small part of electric energy is consumed to drive the internal motor to operate, and the device compresses the low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant.

[0042] The evaporator is used to absorb the energy of air and evaporate the liquid refrigerant at the third gas pressure temperature into the liquid refrigerant at the first gas pressure temperature.

[0043] Specifically, the third gas pressure temperature is low temperature and low pressure. The evaporator is also one of the four major components of the refrigeration system, and the evaporator is used to absorb the energy of air and evaporate the low-temperature and low-pressure liquid refrigerant into low-temperature and low-pressure gaseous refrigerant. It is mainly a finned heat exchanger.

[0044] The fan assembly is used to drive the surrounding air to flow through the evaporator under the drive of the motor, to provide the evaporator with continuous air energy.

[0045] Specifically, the fan assembly is composed of a motor, a fan blade and a wind guide ring. The motor drives the fan blade to rotate, and drives the surrounding air to flow through the evaporator, to provide the evaporator with continuous air energy.

[0046] The expansion valve is used to change the liquid refrigerant at the second gas pressure temperature into the liquid refrigerant at the third gas pressure temperature through throttling function.

[0047] Specifically, the second gas pressure temperature is medium temperature and high pressure, and the third gas pressure temperature is low temperature and low pressure. The expansion valve is also one of the four major components of the refrigeration system, which is a throttling device that changes the medium-temperature and high-pressure liquid refrigerant into low-temperature and low-pressure liquid refrigerant by reducing the cross-sectional area. Since the throttling process is completed in an instant, there is almost no energy loss.

[0048] The economizer is used to recover the remaining heat of the variable frequency air source heat pump.

[0049] Specifically, one waste heat recovery heat exchanger inside the refrigeration system, the condensed medium temperature high pressure liquid refrigerant is divided into two main road and auxiliary road, auxiliary road throttling after the low temperature medium pressure liquid refrigerant in the economizer with the main road without throttling medium temperature high pressure liquid refrigerant heat exchange, waste heat recovery part through the auxiliary road directly back to the compressor, improve the mass flow rate of condensing side, increase the total heating capacity of the system.

[0050] Heat exchanger, installed at the end of the pipeline, for the temperature of hot water to indoor air, improve the current indoor temperature, the current indoor temperature to meet the temperature conditions of indoor.

[0051] Specifically, the heat exchanger is an indoor heat exchanger for transferring the temperature of hot water to indoor air, improving the indoor temperature, so that the current indoor temperature meets the temperature conditions of indoor, even if the current indoor temperature maintains a comfortable temperature.

[0052] Control valve, for installation in front of the heat exchanger, to control the start and stop of the heat exchanger.

[0053] Specifically, the valve installed in front of the heat exchanger is used to start or close the heat exchanger. Usually there are multiple groups of heat exchangers in a family, and some rooms are not used for a long time. The corresponding heat exchanger can be closed by the control valve installed at the end of the pipeline to reduce heat loss.

[0054] Water pump, for driving the water circulation in the pipeline, so that the water absorbs the energy of the refrigerant in the condenser to realize temperature rise, and is taken to the heat exchanger to release heat, so that the current indoor temperature rises to achieve the purpose of indoor heating.

[0055] Specifically, the water pump drives the circulation of water, so that the water absorbs the energy of the refrigerant in the condenser to realize temperature rise, and is taken to the heat exchanger to release heat, so that the current indoor temperature rises to achieve the purpose of indoor heating.

[0056] The working principle of the variable frequency air source heat pump in the embodiment is as follows: In Figure 1In the embodiment, the compressor 18 compresses the low-temperature and low-pressure gaseous refrigerant at the outlet of the evaporator 19, mixes the medium-temperature and medium-pressure gaseous refrigerant from the air supplementing port, and further compresses the mixed refrigerant into high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant flows to the condenser 17 through the refrigeration system pipeline, releases heat in the condenser 17, and is condensed into liquid refrigerant. The released heat heats the terminal heat medium (generally water or antifreeze). The medium-temperature and high-pressure liquid refrigerant is divided into two paths after passing through the main path of the economizer. One path returns to the auxiliary path of the economizer 22 through the auxiliary expansion valve 21 (auxiliary expansion valve) to exchange heat with the main path of the economizer 22, evaporates into medium-temperature and medium-pressure gaseous refrigerant through the air supplementing port of the compressor 18, and is compressed in the compressor 18. The other path is throttled and decompressed by the main expansion valve 21 (main expansion valve) into low-temperature and low-pressure liquid refrigerant, evaporates into low-temperature and low-pressure gaseous refrigerant in the evaporator 19, and returns to the compressor 18 through the air return port of the compressor 18 to be compressed. The above process is repeated to continuously generate heat for the heat medium.

[0057] In Figure 1 In the embodiment, the heat medium is heated by absorbing heat in the condenser, and is circulated to the heat exchanger 23 at the terminal by the power of the water pump 25. The heat medium exchanges heat with air in the heat exchanger 23 at the terminal, radiates heat to indoor air, and heats the indoor air to achieve the effect of heating. The cooled heat medium returns to the condenser 17 through the buffer tank 13, absorbs the condensation heat of the refrigerant, and is heated again. The above process is repeated.

[0058] According to the embodiment of the present application, a variable frequency adjustment method for a variable frequency air source heat pump is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in a different order.

[0059] In the embodiment, a variable frequency adjustment method for a variable frequency air source heat pump is provided, which can be used in a computer device, such as a desktop computer, a portable notebook computer, a server, etc. Figure 2 The flowchart of the variable frequency adjustment method for the variable frequency air source heat pump according to the embodiment of the present application is shown in FIG. 1, which includes the following steps: Figure 2 The flowchart of the variable frequency adjustment method for the variable frequency air source heat pump according to the embodiment of the present application is shown in FIG. 1, which includes the following steps: In step S201, in response to the start of the variable frequency air source heat pump, a preset water temperature and a preset ambient temperature are set, and the compressor is controlled to operate at a rated frequency for a preset time. Then, the current water temperature and the current ambient temperature of the variable frequency air source heat pump are collected.

[0060] Specifically, when the variable frequency air source heat pump is started for the first time, a preset water temperature is automatically set, which can include a preset outlet water temperature and a preset return water temperature. The user needs to select the indoor terminal heat exchanger type on the temperature controller. When selecting the floor heating type, the preset water temperature is automatically set to 35℃. When selecting the fan coil type and radiator type, the preset water temperature is automatically set to 45℃. The preset ambient temperature can include a preset indoor ambient temperature and a preset outdoor ambient temperature. On the basis of setting the preset water temperature, the preset indoor ambient temperature is automatically set to 20℃. When the variable frequency air source heat pump is turned on, the compressor first runs at 60rps, i.e., the compressor runs at the rated frequency of 60Hz. After a preset time (3000s) of stable operation, the current water temperature and the current ambient temperature of the variable frequency air source heat pump are collected, and energy regulation is performed according to the preset water temperature, the preset ambient temperature, the current water temperature, and the current ambient temperature. The current water temperature can include the current return water temperature and the current outlet water temperature, and the current ambient temperature can include the current indoor ambient temperature and the current outdoor ambient temperature.

[0061] In step S202, the rated frequency is adjusted by the target frequency in the energy-saving operating condition frequency table according to the current ambient temperature, wherein the energy-saving operating condition frequency table is generated according to a plurality of preset upper limit frequencies, or is generated according to a plurality of preset lower limit frequencies, each preset upper limit frequency is determined according to a corresponding preset ambient temperature and a preset water temperature, and each preset lower limit frequency corresponds to a preset ambient temperature.

[0062] In a specific example, the current water temperature includes the current return water temperature, the current ambient temperature includes the current outdoor ambient temperature, the preset ambient temperature includes the preset outdoor ambient temperature, and the preset water temperature includes the preset return water temperature. Each preset upper limit frequency is determined according to a corresponding preset outdoor ambient temperature and a preset return water temperature.

[0063] Specifically, the energy-saving operating condition frequency table is an energy-saving operating condition frequency upper limit table, as shown in Table 1 below, which can be regarded as an energy-saving operating condition frequency upper limit table. When the variable frequency air source heat pump is running, the highest operating frequency upper limit point is limited according to the current outdoor ambient temperature and the preset return water temperature. There are 21 upper limit points, which are the plurality of preset upper limit frequencies in the above description. Each preset upper limit frequency is determined according to a corresponding preset outdoor ambient temperature and a preset return water temperature.

[0064] Table 1 Energy-saving operating condition frequency upper limit table

[0065] For example, in the above Table 1, the energy-saving operating condition frequency table is generated according to 21 preset upper limit frequencies, each preset upper limit frequency is determined according to a corresponding preset outdoor ambient temperature and a preset return water temperature, and the determination method is to determine the corresponding preset upper limit frequency according to the preset outdoor ambient temperature and the preset return water temperature.

[0066] In some alternative embodiments, each target preset upper limit frequency in the plurality of preset upper limit frequencies in the energy-saving operating condition frequency table, except for the plurality of preset upper limit frequencies, is generated by a preset linear formula.

[0067] Specifically, the plurality of preset upper limit frequencies can also represent the plurality of preset upper limit frequencies in the blank table between the 21 upper limit points in Table 1, and the plurality of preset upper limit frequencies corresponding to the blank table between the 21 upper limit points are calculated according to the preset linear formula according to the upper limit points before and after (or above and below) each other. The preset linear formula is specifically as follows.

[0068]

[0069] wherein, the target preset upper limit frequency, the current outdoor ambient temperature, the current return water temperature, a first preset return water temperature less than the current return water temperature, a second preset return water temperature greater than the current return water temperature, a first preset outdoor ambient temperature less than the current outdoor ambient temperature, a second preset outdoor ambient temperature greater than the current outdoor ambient temperature, a first preset upper limit frequency corresponding to the current outdoor ambient temperature and the current return water temperature, a second preset upper limit frequency corresponding to the first preset outdoor ambient temperature and the second preset return water temperature, a third preset upper limit frequency corresponding to the second preset outdoor ambient temperature and the first preset return water temperature, a fourth preset upper limit frequency corresponding to the second preset outdoor ambient temperature and the second preset return water temperature.

[0070] In some specific embodiments, the step S202 of adjusting the rated frequency by the target frequency in the energy-saving operating condition frequency table according to the current ambient temperature comprises: Step a1, selecting a preset outdoor ambient temperature matching the current outdoor ambient temperature from the energy-saving operating condition frequency table.

[0071] Step a2, selecting a preset return water temperature matching the current return water temperature from the energy-saving operating condition frequency table.

[0072] Step a3, determining a preset upper limit frequency corresponding to the preset outdoor ambient temperature and the preset return water temperature, and taking the preset upper limit frequency as the target frequency Step a4, if yes, adjusting the rated frequency to the target frequency; Step a5, if no, taking the rated frequency as the target frequency.

[0073] Specifically, since the energy-saving operating condition frequency table is generated according to the plurality of preset upper limit frequencies, for example, a preset upper limit frequency corresponding to the current outdoor ambient temperature is selected as the target frequency from the 21 preset upper limit frequencies. If the rated frequency is greater than the target frequency, the rated frequency is adjusted to the target frequency corresponding to the current return water temperature and the current outdoor ambient temperature, and if not, the rated frequency is taken as the target frequency.

[0074] In the above embodiment, the preset outdoor ambient temperature matching the current outdoor ambient temperature is selected from the energy-saving operating condition frequency table, and the preset return water temperature matching the current return water temperature is selected from the energy-saving operating condition frequency table. That is, the preset upper limit frequency matching the current outdoor ambient temperature and the current return water temperature is selected as the target frequency from the energy-saving operating condition frequency table, and the rated frequency is adjusted according to the target frequency, so that the variable frequency air source heat pump can be flexibly adjusted according to the preset upper limit frequency.

[0075] In another specific example, the plurality of preset lower limit frequencies includes a first preset lower limit frequency, a second preset lower limit frequency, and a third preset lower limit frequency, the preset ambient temperature includes a preset outdoor ambient temperature, and the current ambient temperature includes a current outdoor ambient temperature.

[0076] Specifically, as shown in Figure 3 , it is a schematic diagram of the lower limit table of the energy-saving operating condition frequency in the energy-saving operating condition frequency table. In Figure 3 , it can be clearly seen that each preset lower limit frequency corresponds to a preset outdoor ambient temperature. In Figure 2 , the frequency lower limit 1 is the first preset lower limit frequency, the frequency lower limit 2 is the second preset lower limit frequency, the frequency lower limit 3 is the third preset lower limit frequency, the ambient temperature 1 is the preset outdoor ambient temperature corresponding to the first preset lower limit frequency, the ambient temperature 2 is the preset outdoor ambient temperature corresponding to the second preset lower limit frequency, and the ambient temperature 3 is the preset outdoor ambient temperature corresponding to the third preset lower limit frequency.

[0077] In some other specific embodiments, the step S202 of adjusting the rated frequency according to the current ambient temperature through the target frequency in the energy-saving operating condition frequency table includes: Step b1, if the current outdoor ambient temperature is less than the preset outdoor ambient temperature corresponding to the first preset lower limit frequency, the first preset lower limit frequency is selected as the target frequency from the energy-saving operating condition frequency table.

[0078] Step b2, determining whether the rated frequency is greater than the preset outdoor ambient temperature corresponding to the first preset lower limit frequency.

[0079] Step b3, if yes, the rated frequency is adjusted to the first preset lower limit frequency.

[0080] Step b4, if not, the rated frequency is taken as the target frequency.

[0081] Corresponding Figure 3When the outdoor ambient temperature < the outdoor ambient temperature 1, the minimum frequency is limited to the frequency lower limit 1, and the frequency lower limit 1 is taken as the target frequency. Conversely, the rated frequency is kept unchanged, and the rated frequency is taken as the target frequency.

[0082] In step b5, if the current outdoor ambient temperature is greater than or equal to the preset outdoor ambient temperature corresponding to the third preset lower limit frequency, the third preset lower limit frequency is selected from the energy-saving operating frequency table as the target frequency.

[0083] In step b6, it is judged whether the rated frequency is greater than or equal to the third preset lower limit frequency.

[0084] In step b7, if yes, the rated frequency is adjusted to the third preset lower limit frequency. In step b8, if no, the rated frequency is taken as the target frequency. For Figure 3 When the outdoor ambient temperature ≥ the outdoor ambient temperature 3, the minimum frequency is limited to the frequency lower limit 3, and the frequency lower limit 3 is taken as the target frequency. Conversely, the rated frequency is kept unchanged, and the rated frequency is taken as the target frequency.

[0085] In step b9, if the current outdoor ambient temperature is greater than or equal to the preset outdoor ambient temperature corresponding to the first preset lower limit frequency and is less than the second preset outdoor ambient temperature, the first adjustment frequency is calculated according to the first preset linear formula according to the first preset lower limit frequency and the second preset lower limit frequency, and the first adjustment frequency is taken as the target frequency.

[0086] In step b10, it is judged whether the rated frequency is greater than the target frequency.

[0087] In step b11, if yes, the rated frequency is adjusted to the target frequency.

[0088] In step b12, if no, the rated frequency is taken as the target frequency.

[0089] Corresponding to Figure 3 When the outdoor ambient temperature 1 ≤ the outdoor ambient temperature < the outdoor ambient temperature 2, the first adjustment frequency is linearly calculated according to the frequency lower limit 1 and the frequency lower limit 2 according to the first preset linear formula.

[0090] The first preset linear formula is expressed by the following formula:

[0091] Among them, The first adjustment frequency f is the first preset lower limit frequency f11, the second preset lower limit frequency f12, the preset outdoor ambient temperature t1 corresponding to the first preset lower limit frequency, the preset outdoor ambient temperature t2 corresponding to the second preset lower limit frequency, and the current outdoor ambient temperature t.

[0092] When the first adjustment frequency calculated according to the first preset linear formula meets the condition that the outer ring temperature is 1≤outdoor ring temperature<outer ring temperature 2, the first adjustment frequency is taken as the target frequency. Otherwise, the rated frequency is kept unchanged, and the rated frequency is taken as the target frequency.

[0093] In step b13, if the current outdoor ring temperature is greater than or equal to the preset outdoor ring temperature corresponding to the second preset lower limit frequency and less than the preset outdoor ring temperature corresponding to the third preset lower limit frequency, a second adjustment frequency is calculated according to the second preset lower limit frequency and the third preset lower limit frequency according to the second preset linear formula, and the second adjustment frequency is taken as the target frequency.

[0094] In step b14, it is judged whether the rated frequency is greater than the second adjustment frequency. In step b15, if yes, the rated frequency is adjusted to the second adjustment frequency. In step b16, if no, the rated frequency is taken as the target frequency.

[0095] Corresponding Figure 3 When the outer ring temperature is 2≤outdoor ring temperature<outer ring temperature 3, the second adjustment frequency is linearly calculated according to the frequency lower limit 2 and the frequency lower limit 3 according to the second preset linear formula.

[0096] The second preset linear formula is expressed by the following formula:

[0097] Note: is the second adjustment frequency, f12 is the second preset lower limit frequency, f13 is the third preset lower limit frequency, t2 is the preset outdoor ring temperature corresponding to the second preset lower limit frequency, t3 is the preset outdoor ring temperature corresponding to the third preset lower limit frequency, and t is the current outdoor ring temperature.

[0098] When the second adjustment frequency calculated according to the second preset linear formula meets the condition that the outer ring temperature is 2≤outdoor ring temperature<outer ring temperature 3, the second adjustment frequency is taken as the target frequency. Otherwise, the rated frequency is kept unchanged, and the rated frequency is taken as the target frequency.

[0099] In the above embodiment, the current outdoor ring temperature is compared with a plurality of different preset outdoor ring temperatures from the energy-saving operating frequency table, the best lower limit frequency matched with the current outdoor ring temperature is determined as the target frequency, and the rated frequency is adjusted according to the target frequency, so that the variable frequency air source heat pump can be flexibly adjusted according to the preset lower limit frequency.

[0100] In step S203, the compressor is controlled to operate at the target frequency, and under the preset temperature control condition, the preset water temperature is corrected to the target water temperature according to the preset water temperature, the preset ring temperature, the current water temperature and the current ring temperature.

[0101] In a specific example, the current ring temperature includes a current indoor ring temperature, and the preset temperature control condition includes a first preset temperature control condition, a second preset temperature control condition, and a third preset temperature control condition. Under the preset temperature control condition, the preset water temperature is corrected to the target water temperature according to the preset water temperature, the preset ring temperature, the current water temperature, and the current ring temperature.

[0102] In some optional embodiments, if the current water temperature is the current return water temperature, the preset temperature control condition is generated on the basis of the return water temperature control condition.

[0103] The variable frequency air source heat pump is controlled to start, stop, or change frequency by using the following return water temperature control condition.

[0104] Tiw < Tsw - aw, the heat pump is automatically started Tsw - aw ≤ Tiw < Tsw, the heat pump is high-frequency heating Tsw ≤ Tiw < Tsw + aw, the heat pump is reduced in frequency Tiw ≥ Tsw + aw, the heat pump is automatically stopped Wherein, Tsw is the preset water temperature, aw is the first loading deviation of the heat pump, aw is the first unloading deviation of the heat pump, aw is preferably 2℃, and Tiw is the current return water temperature.

[0105] In other optional embodiments, if the current water temperature is the current outlet water temperature, the preset temperature control condition is generated on the basis of the outlet water temperature control condition.

[0106] The variable frequency air source heat pump is controlled to start, stop, or change frequency by using the following outlet water temperature control condition.

[0107] Tow < Tsw - aw, the heat pump is automatically started Tsw - aw ≤ Tow < Tsw, the heat pump is high-frequency heating Tsw ≤ Tow < Tsw + aw, the heat pump is reduced in frequency Tow ≥ Tsw + aw, the heat pump is automatically stopped Wherein, Tsw is the preset water temperature, aw is the first loading deviation of the heat pump, aw is the first unloading deviation of the heat pump, and Tow is the current outlet water temperature.

[0108] Because the outlet water temperature changes quickly and reacts more sensitively, the calculation based on the water temperature is more accurate. Therefore, in the present embodiment, the preset temperature control condition is preferably generated on the basis of the outlet water temperature control condition.

[0109] The variable frequency air source heat pump generally uses the heat pump start-stop control condition to control the start, stop, and frequency change of the variable frequency air source heat pump. The heat pump start-stop control condition is specifically as follows.

[0110] Tr < Tsr - ar, the heat pump is automatically started Tr > Tsr + ar, the heat pump is automatically stopped Wherein, Tr is the current indoor ring temperature, Tsr is the preset water temperature, ar is the second load deviation of the heat pump, ar is the second unloading deviation of the heat pump, At present, under the above return water temperature control condition and outlet water temperature control condition, the user needs to continuously adjust the preset water temperature according to the actual experience, and the user needs to continuously correct the preset water temperature according to the actual environmental temperature experience, which leads to inaccurate temperature control, and further difficult to meet the user demand. In addition, if the variable frequency air source heat pump is heated at high frequency or at low frequency according to the inaccurate preset water temperature, the variable frequency air source heat pump will work at a non-ideal heating frequency, which is prone to high energy consumption and high noise, and further affects the user experience. When the heat pump is controlled by the heat pump start-stop control condition, since the host and the temperature controller use on-off signal transmission without data interaction, the judgment of indoor temperature can only be started and stopped, and the energy consumption is very high, and the stability of the variable frequency air source heat pump is poor.

[0111] Therefore, in the embodiment, the compressor is controlled to operate at a target frequency, and under the preset temperature control condition, the preset water temperature is corrected to a target water temperature according to the preset water temperature, the preset ring temperature, the current water temperature and the current ring temperature.

[0112] In some specific embodiments, the step S203 of correcting the preset water temperature to the target water temperature under the preset temperature control condition according to the preset water temperature, the preset ring temperature, the current water temperature and the current ring temperature, comprises: Under the first preset temperature control condition, if the load is full and the current indoor ring temperature meets the temperature comfort condition, the target water temperature is controlled to be equal to the preset water temperature.

[0113] In a specific example, the first preset temperature control condition is specifically as follows

[0114]

[0115] Wherein, Tsw is the preset water temperature, Tsw is the current outlet water temperature, ar is the first unloading deviation of the heat pump, Tsr is the preset ring temperature, Tr is the current indoor ring temperature, ar is the second unloading deviation of the heat pump.

[0116] Under the first preset temperature control condition, if the current outlet water temperature And the current indoor ring temperature If the first preset temperature control condition is met, it is determined that the load is moderate, that is, the load is in a full load state, the preset water temperature is reasonable, and the current indoor ring temperature meets the temperature comfort condition, that is, the indoor temperature is comfortable, and the variable frequency air source heat pump is controlled to maintain the current state of operation.

[0117] In the embodiment, according to the full load state of the current load, the preset water temperature is compared with the current outlet water temperature, when the temperature comfort condition is met, the variable frequency air source heat pump is controlled to maintain the current state of operation, and the preset water temperature does not need to be adjusted, thereby meeting the user demand, and avoiding the increase of energy consumption caused by blindly heating the preset water temperature when the indoor temperature is reasonable.

[0118] In some specific embodiments, in the preset temperature control condition, the preset water temperature is corrected to a target water temperature according to the preset water temperature, the preset ring temperature, the current water temperature and the current ring temperature, including: Under the second preset temperature control condition, if the load is in a light load state and the preset water temperature is set to be higher than the current water temperature, and the current indoor ring temperature meets the temperature comfort condition, the heat pump is controlled to perform a frequency reduction heating action.

[0119] In another specific example, the second preset temperature control condition is specifically shown in the following formula

[0120]

[0121] The current outlet water temperature is T1, The preset water temperature is T2, The preset ring temperature is T3, The second unloading deviation of the heat pump is ΔT2.

[0122] Under the second preset temperature control condition, if the current outlet water temperature T1 And the current indoor ring temperature T3 If the above second preset temperature control condition is met, it is determined that the load is light, that is, the load is in a light load state, the preset water temperature is set to be too high, but the indoor temperature is comfortable, at this time, the heat pump is controlled to perform a frequency reduction heating action through the following formula.

[0123] -1, trigger:

[0124] For the second preset temperature control condition, when the preset water temperature is higher than the current outlet water temperature, the heat pump is in a high-frequency heating state, but the current indoor ring temperature is greater than the preset room temperature, and less than the sum of the preset water temperature and the second unloading deviation of the heat pump, at this time, the variable frequency air source heat pump is controlled to enter the frequency reduction operation to maintain the room temperature, so that the preset water temperature is corrected to the current outlet water temperature minus 1, because the unloading temperature is preferably ΔSW=2, so that Tsw≤Tow<Tsw+△sw is satisfied, and the variable frequency air source heat pump enters the frequency reduction temperature maintenance operation.

[0125] The second preset temperature control condition is used in the embodiment to compare the preset water temperature with the current outlet water temperature according to the light load state of the current load, and when the temperature comfort condition is satisfied, the variable frequency air source heat pump is controlled to perform the frequency reduction heating action, so that the user demand can be met, and the problems of high energy consumption, large noise and poor user experience of the variable frequency air source heat pump due to blind high-frequency heating when the room temperature satisfies the temperature comfort condition are avoided.

[0126] In some specific embodiments, the step S203 includes: In a specific example, the third preset temperature control condition is specifically as follows:

[0127]

[0128] wherein, Tsw is the preset water temperature, Tow is the current outlet water temperature, and ΔSW is the second unloading deviation of the heat pump, Tsr is the preset ring temperature, Tin is the current indoor ring temperature, and ΔSR is the second unloading deviation of the heat pump.

[0129] In the third preset temperature control condition, if the current outlet water temperature and the current indoor ring temperature satisfy the third preset temperature control condition, it is determined that the load of the heat pump is heavy, i.e., the load is overloaded, the preset water temperature is set too low, and it is indicated that the variable frequency air source heat pump has entered the frequency reduction operation, and the actual indoor temperature is low. At this time, the preset water temperature is corrected to the target water temperature according to the preset ring temperature, the current indoor ring temperature and a plurality of ring temperature correction coefficients.

[0130] In a specific example, in the process of correcting the preset water temperature to the target water temperature under the third preset temperature control condition, if the current indoor ring temperature is less than the water temperature lower threshold, the target water temperature is re-corrected according to the following preset algorithm until the re-corrected target water temperature reaches the water temperature upper threshold, and the heat pump is controlled to perform the stop action.

[0131]

[0132] wherein, is a target water temperature, is a current outlet water temperature, is a room temperature proportional correction coefficient, is a room temperature integral correction coefficient, is a current indoor ring temperature, is a preset room temperature, is a difference between the current indoor ring temperature and the preset room temperature before correction when the variable frequency air source heat pump works according to > the preset water temperature corrected to the target water temperature, is a room temperature proportional correction coefficient, and a default value is -0.5, representing an actual room temperature change trend after each correction, is a room temperature integral correction coefficient, and a default value is 1.

[0133] That is, under the third preset temperature control condition, if the load is overloaded and the preset water temperature is set lower than the current water temperature, according to the preset ring temperature, the current indoor ring temperature and the plurality of room temperature correction coefficients, the preset water temperature is corrected to the target water temperature, and if the current indoor ring temperature meets the condition r, it is indicated that the current indoor temperature meets the demand, or the target water temperature after re-correction reaches the water temperature upper threshold value to stop correction.

[0134] The third preset temperature control condition is used to compare the preset water temperature with the current outlet water temperature according to the overload state of the current load, and it is indicated that the preset water temperature is set too low. According to the preset ring temperature, the current indoor ring temperature and the plurality of room temperature correction coefficients, the preset water temperature is corrected to the target water temperature, and if the room temperature condition is still not met during the correction process, the correction is repeated until the demand is met. Therefore, the preset water temperature is adaptively adjusted under the premise of considering the current indoor ring temperature, so that the user demand can be met, and the energy consumption caused by blind heating of the preset water temperature can be avoided.

[0135] Step S204, if the variable frequency air source heat pump works according to the target water temperature, the target frequency is corrected according to the high frequency heating time and the load correction time.

[0136] After the preset water temperature of the variable frequency air source heat pump is adjusted to the target water temperature, the user demand is met, and the embodiment also needs to consider whether the working frequency of the variable frequency air source heat pump is reasonable after a period of operation, so as to avoid excessive energy consumption caused by unreasonable working frequency.

[0137] ​​In some specific embodiments, the step S204, if the variable frequency air source heat pump works according to the target outlet water temperature, the target frequency is corrected according to the high frequency heating time and the load correction time, including: Step c1, if the high frequency heating time is greater than or equal to the load correction time, the plurality of preset upper limit frequencies in the energy-saving operating condition frequency table are corrected according to the first frequency correction parameter.

[0138] Step c2, if the high frequency heating time is less than the load correction time, the plurality of preset upper limit frequencies in the energy-saving operating condition frequency table are corrected according to the second frequency correction parameter.

[0139] Specifically, the high frequency heating time is represented by , and the load correction time is represented by . For example, , it is judged that the energy output is too small, the periodic heating time is too long, and the upper limit frequency is too low. , it is judged that the energy output is too large, the periodic heating time is too short, and the upper limit frequency is too high.

[0140] If , the plurality of preset upper limit frequencies in the energy-saving operating condition frequency table are corrected according to the first correction frequency correction parameter. Wherein, the first frequency correction parameter is calculated by the following formula.

[0141]

[0142] Wherein, is the first frequency correction parameter, the correction upper limit is 5rps, that is, 5Hz, is the current upper limit frequency.

[0143] The plurality of preset upper limit frequencies in the energy-saving operating condition frequency table are corrected according to the first frequency correction parameter, and then the following formula is executed.

[0144]

[0145] Wherein, is the preset upper limit frequency in the energy-saving operating condition frequency table after correction according to the first frequency correction parameter, is the preset upper limit frequency in the energy-saving operating condition frequency table before correction, is the first frequency correction parameter.

[0146] If , the plurality of preset upper limit frequencies in the energy-saving operating condition frequency table are corrected according to the second correction frequency correction parameter. Wherein, the second frequency correction parameter is calculated by the following formula.

[0147]

[0148] The plurality of preset upper limit frequencies in the energy-saving operating frequency table are corrected according to the second frequency correction parameter, and then the action is performed through the following formula.

[0149]

[0150] wherein, is the preset upper limit frequency in the energy-saving operating frequency table after being corrected according to the second frequency correction parameter, is the preset upper limit frequency in the energy-saving operating frequency table before being corrected, is the second frequency correction parameter, The lower limit of correction is -5 rps, that is, -5 Hz.

[0151] As shown in the following Table 2, the energy-saving operating frequency table after correction, the plurality of preset upper limit frequencies in Table 2 are the frequency parameters after correction.

[0152] Table 2 Energy-saving operating frequency table after correction

[0153] In this embodiment, the preset water temperature is adaptively corrected to the target water temperature according to the preset temperature control condition, the preset water temperature, the preset ambient temperature, the current water temperature and the current ambient temperature, and then the target frequency is comprehensively corrected according to the high-frequency heating time and the load correction time, so as to ensure that the load can run in the best state and achieve the purpose of saving energy consumption.

[0154] In this embodiment, a variable frequency regulation device of a variable frequency air source heat pump is also provided, which is used to realize the above-mentioned embodiments and preferred embodiments, and will not be described again. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiments is preferably realized in software, hardware, or a combination of software and hardware is also possible and is conceived.

[0155] This embodiment provides a variable frequency regulation device of a variable frequency air source heat pump, as shown in Figure 4 , comprising: The parameter acquisition module 401 is configured to, in response to the start of the variable frequency air source heat pump, set the preset water temperature and the preset ambient temperature, and control the compressor to run at the rated frequency for a preset time, and then acquire the current water temperature and the current ambient temperature of the variable frequency air source heat pump. The frequency regulation module 402 is configured to adjust the rated frequency through the target frequency in the energy-saving operating frequency table according to the current ambient temperature, wherein the energy-saving operating frequency table is generated according to a plurality of preset upper limit frequencies, or the energy-saving operating frequency table is generated according to a plurality of preset lower limit frequencies, each preset upper limit frequency is determined according to a corresponding preset ambient temperature and a preset water temperature, and each preset lower limit frequency corresponds to a preset ambient temperature. The water temperature correction module 403 controls the compressor to operate at a target frequency, and corrects the preset water temperature to a target water temperature according to the preset water temperature, the preset ambient temperature, the current water temperature and the current ambient temperature under preset temperature control conditions. The frequency correction module 404 is configured to correct the target frequency according to the high-frequency heating time and the load correction time if the variable frequency air source heat pump operates at the target water temperature.

[0156] In some optional embodiments, the current water temperature includes a current return water temperature, the current ambient temperature includes a current outdoor ambient temperature, the preset ambient temperature includes a preset outdoor ambient temperature, and the preset water temperature includes a preset return water temperature. Each preset upper limit frequency is determined according to the corresponding preset outdoor ambient temperature and the preset return water temperature. The frequency adjustment module 402 is specifically configured to: select the preset outdoor ambient temperature matching the current outdoor ambient temperature from the energy-saving operating condition frequency table; select the preset return water temperature matching the current return water temperature from the energy-saving operating condition frequency table; determine the preset upper limit frequency corresponding to the preset outdoor ambient temperature and the preset return water temperature, and take the preset upper limit frequency as the target frequency; determine whether the rated frequency is greater than the target frequency; if yes, adjust the rated frequency to the target frequency; if no, take the rated frequency as the target frequency.

[0157] In some optional embodiments, the plurality of preset lower limit frequencies include a first preset lower limit frequency, a second preset lower limit frequency and a third preset lower limit frequency, the preset ambient temperature includes a preset outdoor ambient temperature, and the current ambient temperature includes a current outdoor ambient temperature. Each preset lower limit frequency corresponds to a preset outdoor ambient temperature. The frequency adjustment module 402 is specifically configured to: if the current outdoor ambient temperature is less than the preset outdoor ambient temperature corresponding to the first preset lower limit frequency, select the first preset lower limit frequency as the target frequency from the energy-saving operating condition frequency table; determine whether the rated frequency is greater than the preset outdoor ambient temperature corresponding to the first preset lower limit frequency; if yes, adjust the rated frequency to the first preset lower limit frequency; if no, take the rated frequency as the target frequency; if the current outdoor ambient temperature is greater than or equal to the preset outdoor ambient temperature corresponding to the third preset lower limit frequency, select the third preset lower limit frequency as the target frequency from the energy-saving operating condition frequency table; determine whether the rated frequency is greater than the third preset lower limit frequency; if yes, adjust the rated frequency to the third preset lower limit frequency; if no, take the rated frequency as the target frequency; If the current outdoor ambient temperature is greater than or equal to the preset outdoor ambient temperature corresponding to the first preset lower limit frequency and less than the second preset outdoor ambient temperature, a first adjustment frequency is calculated according to the first preset lower limit frequency and the second preset lower limit frequency according to a first preset linear formula, and the first adjustment frequency is taken as the target frequency; determining whether the rated frequency is greater than or equal to the target frequency; if yes, adjusting the rated frequency to the target frequency; if no, taking the rated frequency as the target frequency; If the current outdoor ambient temperature is greater than or equal to the preset outdoor ambient temperature corresponding to the second preset lower limit frequency and less than the preset outdoor ambient temperature corresponding to the third preset lower limit frequency, a second adjustment frequency is calculated according to the second preset lower limit frequency and the third preset lower limit frequency according to a second preset linear formula, and the second adjustment frequency is taken as the target frequency; determining whether the rated frequency is greater than the second adjustment frequency; if yes, adjusting the rated frequency to the second adjustment frequency; if no, taking the rated frequency as the target frequency.

[0158] In some optional embodiments, the current ambient temperature includes a current indoor ambient temperature, and the preset temperature control condition includes a first preset temperature control condition, a second preset temperature control condition and a third preset temperature control condition. Under the preset temperature control condition, the water temperature correction module 403 is specifically configured to: under the first preset temperature control condition, if the load is full load and the current indoor ambient temperature meets the temperature comfort condition, the target water temperature is controlled to be equal to the preset water temperature.

[0159] under the second preset temperature control condition, if the load is light load and the preset water temperature is set to be higher than the current water temperature, and the current indoor ambient temperature meets the temperature comfort condition, the heat pump is controlled to perform a frequency reduction heating action; under the third preset temperature control condition, if the load is overload and the preset water temperature is set to be lower than the current water temperature, the preset water temperature is corrected to the target water temperature according to the preset ambient temperature, the current indoor ambient temperature and a plurality of room temperature correction coefficients.

[0160] In some optional embodiments, in the process of correcting the preset water temperature to the target water temperature under the third preset temperature control condition, if the current indoor ambient temperature is less than the water temperature lower limit threshold, the target water temperature is re-corrected according to a preset algorithm until the re-corrected target water temperature reaches the water temperature upper limit threshold, and the heat pump is controlled to perform a shutdown action.

[0161] In some optional embodiments, the frequency correction module is specifically configured to: if the high-frequency heating time is greater than or equal to the load correction time, the plurality of preset upper limit frequencies in the energy-saving operating condition frequency table are corrected according to the first frequency correction parameter; If the high-frequency heating time is less than the load correction time, the multiple preset upper limit frequencies in the energy-saving operating condition frequency table are corrected according to the second frequency correction parameter.

[0162] Further function description of each module and unit is the same as the corresponding embodiment described above, and will not be repeated here.

[0163] The frequency conversion adjusting device of the variable frequency air source heat pump in the embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and a memory executing one or more software or fixed programs, and / or other devices that can provide the above functions.

[0164] The embodiment of the application also provides a computer device with the frequency conversion adjusting device of the variable frequency air source heat pump.

[0165] Please refer to Figure 5 , Figure 5 is a structural schematic diagram of a computer device provided by an optional embodiment of the application, as Figure 5 shown, the computer device includes one or more processors 100, a memory 200, and an interface for connecting various components, including a high-speed interface and a low-speed interface. Various components are communicatively connected to each other by different buses, and can be installed on a common mainboard or in other ways as needed. The processor can process instructions executed in the computer device, including instructions stored in the memory or graphics information stored on the memory to display a GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, multiple processors and / or multiple buses can be used with multiple memories and multiple memories, if necessary. Similarly, multiple computer devices can be connected, each providing part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 5 In the embodiment, the processor 100 is taken as an example.

[0166] The processor 100 can be a central processor, a network processor, or a combination thereof. The processor 100 can further include a hardware chip. The hardware chip can be an application specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device can be a complex programmable logic device, a field programmable logic gate array, a general array logic, or any combination thereof.

[0167] The memory 200 stores instructions executable by the at least one processor 100, so that the at least one processor 100 executes the method shown in the above embodiment.

[0168] The memory 200 can include a program storage area and a data storage area. The program storage area can store an operating system, application programs required by at least one function, etc. The data storage area can store data created according to the use of the computer device, etc. In addition, the memory 200 can include a high-speed random access memory, and can further include a non-transitory memory such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some alternative embodiments, the memory 200 can optionally include a memory disposed remotely from the processor 100, which can be connected to the computer device through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0169] The memory 200 can include a volatile memory such as a random access memory, and can further include a non-volatile memory such as a flash memory, a hard disk, or a solid state disk, and can further include a combination of the above-mentioned kinds of memories.

[0170] The computer device further includes a communication interface 300 for communication of the computer device with other devices or communication networks.

[0171] The embodiments of the present application also provide a computer readable storage medium, and the above-mentioned method according to the embodiments of the present application can be implemented in hardware, firmware, or recorded in a storage medium, or stored in a remote storage medium or a non-transitory machine readable storage medium by downloading through a network and stored in a local storage medium, so that the method described herein can be processed by such software on a storage medium using a general-purpose computer, a special-purpose processor, or programmable or special-purpose hardware. The storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid state disk, etc. Further, the storage medium can further include a combination of the above-mentioned kinds of memories. It can be understood that the computer, the processor, the microprocessor, or the programmable hardware includes a storage component that can store or receive software or computer code, when the software or computer code is accessed and executed by the computer, the processor, or the hardware, the method shown in the above embodiments is implemented.

[0172] Part of the present application can be applied as a computer program product, for example, computer program instructions, when executed by a computer, through the operation of the computer, can invoke or provide the method and / or technical solutions according to the present application. Those skilled in the art should understand that the form of computer program instructions in computer readable medium includes but is not limited to source file, executable file, installation package file and the like, and accordingly, the way of computer program instructions executed by computer includes but is not limited to: the computer directly executes the instructions, or the computer compiles the instructions and then executes the corresponding compiled program, or the computer reads and executes the instructions, or the computer reads and installs the instructions and then executes the corresponding installed program. Here, the computer readable medium can be any available computer readable storage medium or communication medium accessible to the computer.

[0173] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A variable frequency adjustment method of a variable frequency air source heat pump, characterized by, The method comprises: in response to the variable frequency air source heat pump starting, setting a preset water temperature and a preset ambient temperature, and controlling the compressor to operate at a rated frequency for a preset time, collecting the current water temperature and the current ambient temperature of the variable frequency air source heat pump; adjusting the rated frequency by a target frequency in an energy-saving working condition frequency table according to the current ambient temperature, wherein the energy-saving working condition frequency table is generated according to a plurality of preset upper limit frequencies, or the energy-saving working condition frequency table is generated according to a plurality of preset lower limit frequencies, each preset upper limit frequency is determined according to a corresponding preset ambient temperature and a preset water temperature, and each preset lower limit frequency corresponds to a preset ambient temperature; controlling the compressor to operate at the target frequency, and correcting the preset water temperature to a target water temperature according to the preset water temperature, the preset ambient temperature, the current water temperature and the current ambient temperature under a preset temperature control condition; if the variable frequency air source heat pump works at the target water temperature, correcting the target frequency according to a high frequency heating time and a load correction time.

2. The method of claim 1, wherein, The current water temperature comprises a current return water temperature, the current ambient temperature comprises a current outdoor ambient temperature, the preset ambient temperature comprises a preset outdoor ambient temperature, the preset water temperature comprises a preset return water temperature, each preset upper limit frequency is determined according to a corresponding preset outdoor ambient temperature and a preset return water temperature, and adjusting the rated frequency by a target frequency in an energy-saving working condition frequency table according to the current ambient temperature comprises: selecting a preset outdoor ambient temperature matching the current outdoor ambient temperature from the energy-saving working condition frequency table; selecting a preset return water temperature matching the current return water temperature from the energy-saving working condition frequency table; determining a preset upper limit frequency corresponding to the preset outdoor ambient temperature and the preset return water temperature, and taking the preset upper limit frequency as the target frequency; determining whether the rated frequency is greater than the target frequency; if yes, adjusting the rated frequency to the target frequency; if no, taking the rated frequency as the target frequency.

3. The method of claim 1, wherein, The plurality of preset lower limit frequencies comprises a first preset lower limit frequency, a second preset lower limit frequency and a third preset lower limit frequency, the preset ambient temperature comprises a preset outdoor ambient temperature, the current ambient temperature comprises a current outdoor ambient temperature, each preset lower limit frequency corresponds to a preset outdoor ambient temperature, and adjusting the rated frequency by a target frequency in an energy-saving working condition frequency table according to the current ambient temperature comprises: if the current outdoor ambient temperature is less than a preset outdoor ambient temperature corresponding to the first preset lower limit frequency, selecting the first preset lower limit frequency as the target frequency from the energy-saving working condition frequency table; determining whether the rated frequency is greater than the preset outdoor ambient temperature corresponding to the first preset lower limit frequency; if yes, adjusting the rated frequency to the first preset lower limit frequency; if no, taking the rated frequency as the target frequency; if the current outdoor ambient temperature is greater than or equal to a preset outdoor ambient temperature corresponding to the third preset lower limit frequency, selecting the third preset lower limit frequency as the target frequency from the energy-saving working condition frequency table; determining whether the rated frequency is greater than the third preset lower limit frequency; if yes, adjusting the rated frequency to the third preset lower limit frequency; if no, taking the rated frequency as the target frequency; If the current outdoor ambient temperature is greater than or equal to the preset outdoor ambient temperature corresponding to the first preset lower limit frequency and less than the second preset outdoor ambient temperature, a first adjusted frequency is calculated according to the first preset lower limit frequency and the second preset lower limit frequency according to a first preset linear formula, and the first adjusted frequency is taken as the target frequency; determining whether the rated frequency is greater than or equal to the target frequency; if yes, adjusting the rated frequency to the target frequency; if no, taking the rated frequency as the target frequency; If the current outdoor ambient temperature is greater than or equal to the preset outdoor ambient temperature corresponding to the second preset lower limit frequency and less than the preset outdoor ambient temperature corresponding to the third preset lower limit frequency, a second adjusted frequency is calculated according to the second preset lower limit frequency and the third preset lower limit frequency according to a second preset linear formula, and the second adjusted frequency is taken as the target frequency; determining whether the rated frequency is greater than the second adjusted frequency; if yes, adjusting the rated frequency to the second adjusted frequency; if no, taking the rated frequency as the target frequency.

4. The method of claim 1, wherein, The current ambient temperature includes a current indoor ambient temperature, and the preset temperature control condition includes a first preset temperature control condition, a second preset temperature control condition, and a third preset temperature control condition. Under the preset temperature control condition, the preset water temperature is corrected to a target water temperature according to the preset water temperature, the preset ambient temperature, the current water temperature, and the current ambient temperature, including: Under the first preset temperature control condition, if the load is full and the current indoor ambient temperature meets the temperature comfort condition, the target water temperature is controlled to be equal to the preset water temperature; Under the second preset temperature control condition, if the load is light and the preset water temperature setting is higher than the current water temperature, and the current indoor ambient temperature meets the temperature comfort condition, the heat pump is controlled to perform a frequency reduction heating action; Under the third preset temperature control condition, if the load is overloaded and the preset water temperature setting is lower than the current water temperature, the preset water temperature is corrected to the target water temperature according to the preset ambient temperature, the current indoor ambient temperature, and a plurality of ambient temperature correction coefficients.

5. The method of claim 4, wherein, Under the third preset temperature control condition, during the process of correcting the preset water temperature to the target water temperature, if the current indoor ambient temperature is less than a water temperature lower threshold, the target water temperature is re-corrected according to a preset algorithm until the re-corrected target water temperature reaches a water temperature upper threshold, and the heat pump is controlled to perform a shutdown action.

6. The method of claim 1, wherein, If the variable frequency air source heat pump works according to the target outlet water temperature, the target frequency is corrected according to the high-frequency heating time and the load correction time, including: If the high-frequency heating time is greater than or equal to the load correction time, a plurality of preset upper limit frequencies in the energy-saving operating condition frequency table are corrected according to a first frequency correction parameter; If the high-frequency heating time is less than the load correction time, a plurality of preset upper limit frequencies in the energy-saving operating condition frequency table are corrected according to a second frequency correction parameter.

7. A variable speed air source heat pump characterized by, including: an outdoor ambient temperature sensor for detecting a current outdoor ambient temperature in the current outdoor ambient temperature; a controller for executing the variable frequency adjustment method of the variable frequency air source heat pump according to any one of claims 1 to 6; An indoor temperature controller is configured to detect a current indoor ambient temperature in a current ambient temperature and send a first control signal to the controller according to a preset ambient temperature; A buffer water tank is installed on a pipeline of a variable frequency air source heat pump terminal and configured to store water; An exhaust valve is installed on a top of the buffer water tank and configured to exhaust gas of the variable frequency air source heat pump; A water outlet temperature sensor is installed on a water outlet pipeline and configured to detect a current water outlet temperature in a current water temperature and send a second control signal to the controller according to the current water outlet temperature; A water return temperature sensor is installed on a water return pipeline and configured to detect a current water return temperature in the current water temperature and send a third control signal to the controller according to the current water return temperature; A condenser is configured to condense gaseous refrigerant at a first gas pressure temperature into gaseous refrigerant at a second gas pressure temperature to transfer heat to water in the pipeline, wherein the first gas pressure temperature is higher than the second gas pressure temperature; A compressor is configured to compress gaseous refrigerant at a third gas pressure temperature into gaseous refrigerant at the first gas pressure temperature, wherein the third gas pressure temperature is less than the second gas pressure temperature; An evaporator is configured to absorb energy of air and evaporate liquid refrigerant at the third gas pressure temperature into liquid refrigerant at the first gas pressure temperature; A fan assembly is configured to drive ambient air to flow through the evaporator under driving of a motor to provide the evaporator with continuous air energy; An expansion valve is configured to change liquid refrigerant at the second gas pressure temperature into liquid refrigerant at the third gas pressure temperature through throttling; An economizer is configured to recycle residual heat of the variable frequency air source heat pump; A heat exchanger is installed at a terminal of the pipeline and configured to transfer temperature of hot water to indoor air to increase the current indoor ambient temperature, and the current indoor ambient temperature meets temperature suitable conditions of the indoor; A control valve is installed in front of the heat exchanger and configured to control start and stop of the heat exchanger; A water pump is configured to drive water in the pipeline to circulate, absorb energy of refrigerant in the condenser to increase temperature of the water, and bring the water to the heat exchanger to release heat, so that the current indoor ambient temperature increases to achieve the purpose of indoor heating.

8. A variable frequency regulating device for a variable frequency air source heat pump, characterized by, The device comprises: A parameter acquisition module is configured to set a preset water temperature and a preset ambient temperature in response to starting of the variable frequency air source heat pump, and control the compressor to operate at a rated frequency for a preset time, and then acquire a current water temperature and a current ambient temperature of the variable frequency air source heat pump; A frequency adjustment module is configured to adjust the rated frequency to a target frequency in an energy-saving working condition frequency table according to the current ambient temperature, wherein the energy-saving working condition frequency table is generated according to a plurality of preset upper limit frequencies, or the energy-saving working condition frequency table is generated according to a plurality of preset lower limit frequencies, each preset upper limit frequency is determined according to a corresponding preset ambient temperature and a preset water temperature, and each preset lower limit frequency corresponds to a preset ambient temperature; A water temperature correction module is configured to control the compressor to operate at the target frequency, and correct the preset water temperature to a target water temperature according to the preset water temperature, the preset ambient temperature, the current water temperature and the current ambient temperature under a preset temperature control condition. The frequency correction module is configured to correct the target frequency according to a high-frequency heating time and a load correction time if the variable frequency air source heat pump operates according to the target water temperature.

9. A computer device, comprising: The frequency correction module is configured to correct the target frequency according to a high-frequency heating time and a load correction time if the variable frequency air source heat pump operates according to the target water temperature. The memory and the processor are in communication connection with each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the variable frequency adjustment method of the variable frequency air source heat pump according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions for causing a computer to perform the variable frequency adjustment method of the variable frequency air source heat pump according to any one of claims 1 to 6.

Images