Air energy water heater control method, device and air energy water heater

Abstract

The present application relates to a control method, device and air-energy water heater control for an air-energy water heater, which obtains the compressor exhaust temperature, water tank temperature and ambient temperature of the air-energy water heater, and determines the compressor frequency in combination with the obtained compressor exhaust temperature, water tank temperature and ambient temperature, and finally controls the compressor of the air-energy water heater to operate at the determined compressor frequency. This solution can determine the currently required compressor frequency in combination with the compressor exhaust temperature during the operation of the air-energy water heater, so that the compressor frequency changes in time with the change of load, alleviates the situation that the compressor frequency is over-adjusted and causes shutdown protection when the load of the air-energy water heater changes sharply, and improves the operating reliability of the air-energy water heater.

Description

Technical Field

[0001] The present application relates to the technical field of water heaters, and in particular to a control method and device for an air-energy water heater and an air-energy water heater. Background Art

[0002] Air-energy water heaters are also called air source heat pump water heaters. They operate by driving the compressor. After the high-pressure liquid working medium passes through the electronic expansion valve, it evaporates into gas in the evaporator and absorbs a large amount of heat energy from the air. After that, the gaseous working medium is compressed by the compressor into a high-temperature, high-pressure liquid working medium, which enters the condenser to release heat to heat the water. Air-energy water heaters have many advantages such as energy saving, safety, and environmental protection, and are deeply loved by users.

[0003] However, when the load of the air energy water heater changes sharply (such as sudden change in ambient temperature), it is easy to cause the compressor frequency to over-adjust, and in severe cases, it will cause shutdown protection. Therefore, the operation reliability of traditional air energy water heaters is poor. Summary of the invention

[0004] Based on this, it is necessary to provide an air-energy water heater control method, device and air-energy water heater to alleviate the situation where the compressor frequency over-adjusts and causes shutdown protection when the load of the air-energy water heater changes sharply, thereby improving the operating reliability of the air-energy water heater.

[0005] A control method for an air-energy water heater comprises: obtaining a compressor exhaust temperature, a water tank temperature and an ambient temperature of the air-energy water heater; determining a compressor frequency according to the compressor exhaust temperature, the water tank temperature and the ambient temperature; and controlling the compressor of the air-energy water heater to operate at the compressor frequency.

[0006] The above-mentioned air-energy water heater control method obtains the compressor exhaust temperature, water tank temperature and ambient temperature of the air-energy water heater, and determines the compressor frequency in combination with the obtained compressor exhaust temperature, water tank temperature and ambient temperature, and finally controls the compressor of the air-energy water heater to operate at the determined compressor frequency. This scheme can determine the currently required compressor frequency in combination with the compressor exhaust temperature during the operation of the air-energy water heater, so that the compressor frequency changes in time with the load change, alleviates the situation where the compressor frequency is over-adjusted and causes shutdown protection when the load of the air-energy water heater changes sharply, and improves the operating reliability of the air-energy water heater.

[0007] In one of the embodiments, the method further includes: when the air-energy water heater is turned on, obtaining the initial water tank temperature when the air-energy water heater is turned on; determining the initial compressor frequency according to the initial water tank temperature; controlling the compressor of the air-energy water heater to start and run at the initial compressor frequency; after the compressor starts and runs at the initial compressor frequency, if a first preset condition is met, periodically entering the step of determining the compressor frequency according to the compressor exhaust temperature, the water tank temperature and the ambient temperature.

[0008] In one of the embodiments, determining the initial compressor frequency according to the initial water tank temperature includes: determining the initial compressor frequency according to the initial water tank temperature and a preset initial compressor frequency model.

[0009] In one embodiment, the preset initial compressor frequency model includes: P0=0T w0 2 +0T w0 +0, where P0 is the initial compressor frequency, T w0 is the initial water tank temperature, A0, B0, C0 are constants greater than 0.

[0010] In one of the embodiments, determining the compressor frequency based on the compressor exhaust temperature, the water tank temperature and the ambient temperature includes: determining a target compressor frequency model based on the water tank temperature and the ambient temperature; determining the compressor frequency based on the compressor exhaust temperature, the water tank temperature, the ambient temperature and the target compressor frequency model.

[0011] In one embodiment, the water tank temperature includes several water tank temperatures obtained by detecting several positions of the water tank; determining the target compressor frequency model based on the water tank temperature and the ambient temperature includes: determining the maximum water tank temperature among the several water tank temperatures; if the ambient temperature is greater than a first preset temperature, and the maximum water tank temperature is greater than or equal to a second preset temperature, determining that the target compressor frequency model is the first preset frequency model; if the ambient temperature is less than or equal to the first preset temperature, and / or the maximum water tank temperature is less than the second preset temperature, determining that the target compressor frequency model is the second preset frequency model.

[0012] In one embodiment, the first preset frequency model includes: m =A1T w 2 +B1(T w -T p )+C1T e +D1, where P m is the compressor frequency, Tw is the average temperature of several water tanks, T p is the compressor exhaust temperature, T e is the ambient temperature, A1, B1 and D1 are constants greater than 0, and C1 is a constant less than 0;

[0013] And / or, the second preset frequency model includes: m =A2T w 2 +A2T w +B2T e +C2, where P m is the compressor frequency, T w is the average temperature of several water tanks, T e is the ambient temperature, A2 and C2 are constants greater than 0, and B2 is a constant less than zero.

[0014] In one of the embodiments, the method further includes: obtaining the compressor suction temperature of the air-energy water heater and the pipe temperature between the air-side heat exchanger and the electronic expansion valve; determining the opening change according to the compressor frequency, the compressor suction temperature, the pipe temperature, the ambient temperature and the compressor exhaust temperature; and adjusting the opening of the electronic expansion valve of the air-energy water heater according to the opening change.

[0015] In one of the embodiments, the method further includes: when the air-energy water heater is turned on, determining the initial opening according to the initial ambient temperature and the initial water tank temperature when the air-energy water heater is turned on; controlling the electronic expansion valve to open and operate at the initial opening; after the electronic expansion valve is opened and operates at the initial opening, if a second preset condition is met, periodically entering the step of determining the opening change according to the compressor frequency, the compressor suction temperature, the pipe temperature, the ambient temperature and the compressor exhaust temperature.

[0016] In one of the embodiments, the initial opening is determined based on the initial ambient temperature and the initial water tank temperature when the air-energy water heater is turned on, including: if the initial ambient temperature is less than a third preset temperature, determining the initial opening to be a preset opening; if the initial ambient temperature is greater than or equal to the third preset temperature, determining the initial opening based on the initial water tank temperature, the initial ambient temperature and a preset initial opening model.

[0017] In one embodiment, the preset initial opening model includes: K0 = a0T w0 +b0T e0 +c0, where K0 is the initial opening, T e0 is the initial ambient temperature, T w0is the initial water tank temperature, a0 is a constant less than 0, and b0 and c0 are constants greater than 0.

[0018] In one embodiment, determining the opening degree change amount according to the compressor frequency, the compressor suction temperature, the pipe temperature, the ambient temperature, and the compressor discharge temperature includes: determining a target suction superheat degree according to the ambient temperature and the compressor discharge temperature; determining the opening degree change amount according to the compressor frequency, the compressor suction temperature, the pipe temperature, and the target suction superheat degree.

[0019] In one embodiment, determining the opening degree change amount according to the compressor frequency, the compressor suction temperature, the pipe temperature, and the target suction superheat degree includes: determining a frequency change amount according to the compressor frequency of the current opening degree adjustment period and the compressor frequency of the previous opening degree adjustment period; determining the opening degree change amount according to the frequency change amount, the compressor suction temperature, the pipe temperature, and the target suction superheat degree.

[0020] In one embodiment, determining the opening degree change amount according to the frequency change amount, the compressor suction temperature, the pipe temperature, and the target suction superheat degree includes: determining the opening degree change amount according to the frequency change amount, the compressor suction temperature, the pipe temperature, the target suction superheat degree, and a preset opening degree change model.

[0021] In one embodiment, the preset opening degree change model includes: Δk = a1ΔP + b1t x -c1T g -d1T M , where Δk is the opening degree change amount, ΔP is the frequency change amount, T x is the compressor suction temperature, T g is the pipe temperature, T M is the target suction superheat degree, 0 < a1 < 1, and b1, c1, and d1 are constants greater than 0.

[0022] An air energy water heater control device includes: a parameter acquisition module for acquiring the compressor discharge temperature, the water tank temperature, and the ambient temperature of the air energy water heater; a frequency determination module for determining the compressor frequency according to the compressor discharge temperature, the water tank temperature, and the ambient temperature; and a frequency adjustment module for controlling the compressor of the air energy water heater to operate at the compressor frequency.

[0023] An air-energy water heater comprises: an ambient temperature collector, an exhaust temperature collector, a water tank temperature collector, an air-side heat exchanger, a water-side heat exchanger, a water tank, a compressor, an electronic expansion valve, a four-way valve and a controller, wherein the water-side heat exchanger and the water tank temperature collector are respectively arranged on the water tank, the exhaust temperature collector is arranged on the exhaust port of the compressor, the ambient temperature collector is arranged on the air-side heat exchanger, the exhaust port of the compressor is connected to the first end of the four-way valve, the air intake port of the compressor is connected to the second end of the four-way valve, the third end of the four-way valve is connected to the air-side heat exchanger, the air-side heat exchanger is connected to the water-side heat exchanger through the electronic expansion valve, the fourth end of the four-way valve is connected to the water-side heat exchanger, the electronic expansion valve, the ambient temperature collector, the exhaust temperature collector, the water tank temperature collector and the four-way valve are respectively connected to the controller, and the controller is used to execute the above-mentioned air-energy water heater control method. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a flow chart of a method for controlling an air-energy water heater in one embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of the compressor startup control process in one embodiment of the present application;

[0027] Figure 3 This is a schematic diagram of a compressor startup control process in another embodiment of the present application;

[0028] Figure 4 This is a flow chart of an air energy water heater control method in another embodiment of the present application;

[0029] Figure 5 This is a flow chart of an air energy water heater control method in another embodiment of the present application;

[0030] Figure 6 This is a schematic diagram of the opening adjustment process in one embodiment of the present application;

[0031] Figure 7 This is a schematic diagram of the electronic expansion valve startup control process in one embodiment of the present application;

[0032] Figure 8 This is a schematic diagram of the electronic expansion valve startup control process in another embodiment of the present application;

[0033] Fig. 9 This is a schematic diagram of the opening adjustment process in another embodiment of the present application;

[0034] Fig.10 This is a schematic diagram of the opening adjustment process in another embodiment of the present application;

[0035] Fig.11 This is a schematic diagram of the opening adjustment process in another embodiment of the present application;

[0036] Fig.12 This is a schematic diagram of the structure of an air energy water heater control device in one embodiment of the present application;

[0037] Fig.13 This is a structural schematic diagram of an air energy water heater control device in another embodiment of the present application;

[0038] Fig.14 This is a structural schematic diagram of an air energy water heater control device in another embodiment of the present application;

[0039] Fig.15 This is a structural schematic diagram of an air energy water heater control device in another embodiment of the present application;

[0040] Fig.16 This is a schematic diagram of the structure of an air-energy water heater in one embodiment of the present application.

[0041] Explanation of the reference numerals: 161 - ambient temperature collector, 162 - exhaust temperature collector, 163 - water tank temperature collector, 164 - air side heat exchanger, 165 - water side heat exchanger, 166 - water tank, 167 - compressor, 168 - electronic expansion valve, 169 - four-way valve, 170 - suction temperature collector, 171 - pipe temperature collector. DETAILED DESCRIPTION

[0042] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0043] See also Figure 1 , a method for controlling an air energy water heater includes steps 102 , 104 and 106 .

[0044] Step 102, obtaining the compressor exhaust temperature, water tank temperature and ambient temperature of the air energy water heater.

[0045] Specifically, the compressor exhaust temperature is the temperature of the exhaust port of the compressor of the air-energy water heater; the water tank temperature is the temperature of the water in the water tank of the air-energy water heater; and the ambient temperature is the air temperature of the environment in which the air-energy water heater is located. The compressor exhaust temperature, the water tank temperature, and the ambient temperature are not unique in obtaining the compressor exhaust temperature, the water tank temperature, and the ambient temperature. In one embodiment, temperature collectors may be respectively arranged at different parts of the air-energy water heater. After the compressor exhaust temperature, the water tank temperature, and the ambient temperature are respectively obtained by each temperature collector, they are sent to the controller of the air-energy water heater, and the controller realizes the operation control of the air-energy water heater by combining various temperature parameters.

[0046] It can be understood that in another embodiment, the controller has a communication function, and the controller is communicatively connected to a terminal device (such as a mobile phone, etc.). The controller can locate the current geographical location information of the air-energy water heater by communicating with the terminal device, and use the ambient temperature corresponding to the current geographical location information as the ambient temperature of the air-energy water heater.

[0047] In a more detailed embodiment, the air-energy water heater includes an ambient temperature collector, an exhaust temperature collector, a water tank temperature collector, an air-side heat exchanger, a water-side heat exchanger, a water tank, a compressor, an electronic expansion valve, a four-way valve and a controller. The water-side heat exchanger and the water tank temperature collector are respectively arranged on the water tank, the exhaust temperature collector is arranged at the exhaust port of the compressor, the ambient temperature collector is arranged on the air-side heat exchanger, the exhaust port of the compressor is connected to the first end of the four-way valve, the air intake port of the compressor is connected to the second end of the four-way valve, the third end of the four-way valve is connected to the air-side heat exchanger, the air-side heat exchanger is connected to the water-side heat exchanger through the electronic expansion valve, the fourth end of the four-way valve is connected to the water-side heat exchanger, and the electronic expansion valve, the ambient temperature collector, the exhaust temperature collector, the water tank temperature collector and the four-way valve are respectively connected to the controller.

[0048] The air-energy water heater control method provided in the present application is applied to a controller. Correspondingly, the controller receives the temperatures collected by the exhaust temperature collector, the water tank temperature collector and the ambient temperature collector as the compressor exhaust temperature, the water tank temperature and the ambient temperature, respectively.

[0049] It should be pointed out that, in one embodiment, only one water tank temperature collector may be provided at the water tank to collect a water tank temperature, and subsequent controllers all control the air-energy water heater according to the water tank temperature. In another embodiment, more than two water tank temperature collectors may be provided at different positions of the water tank. In actual scenarios, the air-energy water heater is controlled in combination with the multiple water tank temperatures obtained. The specific number of water tank temperature collectors to be provided can be selected in combination with the actual scenario, and there is no specific limitation. For ease of understanding, in each of the following embodiments, it can be assumed that the water tank is provided with multiple water tank temperature collectors, and more than two water tank temperatures can be obtained at the same time.

[0050] Step 104, determining the compressor frequency according to the compressor exhaust temperature, the water tank temperature and the ambient temperature.

[0051] Specifically, after obtaining the compressor exhaust temperature, water tank temperature and ambient temperature, the controller will analyze and calculate in combination with the currently obtained compressor exhaust temperature, water tank temperature and ambient temperature to obtain the compressor frequency of the air-energy water heater.

[0052] In more detail, in one embodiment, after obtaining the compressor exhaust temperature, water tank temperature and ambient temperature, the controller can use a certain time length as the adjustment period of the compressor frequency, and periodically combine the latest obtained compressor exhaust temperature, water tank temperature and ambient temperature for analysis and calculation to obtain the compressor frequency of the air-energy water heater.

[0053] It can be understood that in one embodiment, the controller can be based on the adjustment period of the compressor frequency, periodically obtain the compressor exhaust temperature, water tank temperature and ambient temperature, and then analyze and calculate the compressor frequency in combination with each temperature. In another embodiment, the controller can also obtain the compressor exhaust temperature, water tank temperature and ambient temperature in real time at a period less than or greater than the adjustment period of the compressor frequency, and when the adjustment period of the compressor frequency is reached, the compressor frequency is analyzed and calculated based on the latest obtained compressor exhaust temperature, water tank temperature and ambient temperature. There is no specific limitation on which method to use, and it can be selected based on actual needs.

[0054] It should be noted that the adjustment period of the compressor frequency is not unique. In a more detailed embodiment, the adjustment period of the compressor frequency can be set to 2 minutes. In other embodiments, it can be set to be greater than 2 minutes, or less than 2 minutes, depending on actual needs.

[0055] Step 106, controlling the compressor of the air energy water heater to operate at the compressor frequency.

[0056] Specifically, after the controller analyzes and obtains the compressor frequency required by the compressor under the current state, it will control the compressor to operate at the current compressor frequency to ensure that the compressor frequency matches the actual operating condition of the air-to-water heater to avoid over-adjustment.

[0057] More specifically, if the controller combines the compressor exhaust temperature, water tank temperature and ambient temperature, and analyzes that the compressor frequency is different from the compressor frequency of the previous adjustment cycle, the compressor frequency is adjusted to the currently determined compressor frequency. If the compressor frequency is the same as the compressor frequency of the previous adjustment cycle, no adjustment is required, and the compressor can continue to operate at the current compressor frequency.

[0058] It can be understood that in the technical solution of the present application, the compressor frequency refers to the compressor frequency of the air-energy water heater during normal hot water production operation, rather than the compressor frequency of the air-energy water heater during defrosting operation. When the air-energy water heater is in normal hot water production operation, the air-energy water heater control method provided in the embodiment of the present application can be used to adjust the compressor frequency. When the air-energy water heater is in defrosting or oil return operation mode, other control logics are used to control the operation of the compressor, which will not be repeated here.

[0059] It should be noted that the compressor frequency is not unique. In one embodiment, it can be represented by the number of steps of the motor in the compressor. In another embodiment, it can also be represented by the speed of the motor, etc., without specific limitation. In order to facilitate understanding of the technical solution of the present application, the compressors in the following embodiments are all variable frequency compressors, and the compressor frequency can be understood as the number of steps of the motor in the compressor. The adjustment of the compressor frequency is essentially the adjustment of the number of steps of the motor.

[0060] In an air-energy water heater, as the load of the air-energy water heater changes, the compressor exhaust temperature often shows better following characteristics, that is, when the load changes, the compressor exhaust temperature can change faster than the water tank temperature and ambient temperature of the air-energy water heater to follow the load changes. Based on this characteristic, the technical solution of the present application obtains the compressor exhaust temperature during the operation of the air-energy water heater, and adjusts the compressor frequency in combination with the water tank temperature and ambient temperature, so that when the load changes, the compressor frequency can be adjusted faster, avoiding over-adjustment due to frequency adjustment lag, and reducing the possibility of the air-energy water heater entering shutdown protection due to rapid load changes.

[0061] The above-mentioned air-energy water heater control method obtains the compressor exhaust temperature, water tank temperature and ambient temperature of the air-energy water heater, and determines the compressor frequency in combination with the obtained compressor exhaust temperature, water tank temperature and ambient temperature, and finally controls the compressor of the air-energy water heater to operate at the determined compressor frequency. This scheme can determine the currently required compressor frequency in combination with the compressor exhaust temperature during the operation of the air-energy water heater, so that the compressor frequency changes in time with the load change, alleviates the situation where the compressor frequency is over-adjusted and causes shutdown protection when the load of the air-energy water heater changes sharply, and improves the operating reliability of the air-energy water heater.

[0062] See also Figure 2 In one embodiment, the air energy water heater control method further includes step 202 , step 204 and step 206 .

[0063] Step 202, when the air-energy water heater is turned on, the initial water tank temperature of the air-energy water heater is obtained.

[0064] Step 204, determining the initial compressor frequency according to the initial water tank temperature.

[0065] Step 206, controlling the compressor of the air-energy water heater to start running at an initial compressor frequency.

[0066] After the compressor is started to operate at the initial compressor frequency, if the first preset condition is met, the process periodically enters step 102 .

[0067] Specifically, the initial compressor frequency is the required operating frequency when the compressor is initially turned on. The initial water tank temperature is the temperature of the water tank when the air-energy water heater is turned on. In a more detailed embodiment, more than two water tank temperature collectors can be set at different positions of the water tank. When the air-energy water heater is turned on, the controller calculates the average value of the water temperature collected by each water tank temperature collector to obtain the initial water tank temperature.

[0068] According to the solution of this embodiment, when the air-energy water heater unit is turned on, the controller will first determine the initial compressor frequency based on the initial water tank temperature, and then control the compressor to operate at the initial compressor frequency until the operation meets the first preset condition. Then, the compressor frequency is periodically adjusted based on the compressor exhaust temperature, water tank temperature and ambient temperature to achieve segmented control of the compressor and improve the reliability of compressor startup.

[0069] It can be understood that the specific type of the first preset condition is not unique. In a more detailed embodiment, the operation of the compressor satisfies the first preset condition including: the time for the compressor to start running reaches the first preset duration. That is, the scheme of this embodiment first controls the compressor to start running at the initial compressor frequency for the first preset duration, and then periodically adjusts the compressor frequency in combination with the compressor exhaust temperature, water tank temperature and ambient temperature. The size of the first preset duration is not unique. In a more detailed embodiment, the first preset duration can be set to 3 minutes. In other embodiments, it can also be greater than 3 minutes or less than 3 minutes, without specific limitation.

[0070] In a more detailed embodiment, the range of the initial compressor frequency is: 20≤P0≤P max -20, where P0 is the initial compressor frequency, P max is the highest achievable compressor frequency.

[0071] See also Figure 3 , in one embodiment, step 204 includes step 302.

[0072] Step 302, determining the initial compressor frequency according to the initial water tank temperature and a preset initial compressor frequency model.

[0073] Specifically, the preset initial compressor frequency model characterizes the corresponding relationship between the initial water tank temperature and the initial compressor frequency. The preset initial compressor frequency model is pre-stored in the controller. In the actual analysis process, it is only necessary to substitute the collected initial water tank temperature (a single water tank temperature or an average of several water tank temperatures in combination with actual conditions) into the preset initial compressor frequency model for analysis and calculation to obtain the initial compressor frequency.

[0074] It can be understood that the method of obtaining the preset initial compressor frequency model is not unique. In one embodiment, experimental testing and analysis can be carried out on the same model of air-energy water heater under an experimental environment, and the initial compressor frequency and initial water tank temperature of the compressor can be fitted when the air-energy water heater is in the optimal operating state, and stored in the controller.

[0075] It should be pointed out that in other embodiments, the correspondence between different initial water tank temperatures and initial compressor frequencies can be preset in the controller in the form of a chart or the like. After the controller obtains the initial water tank temperature, it only needs to match the water tank temperature to obtain the initial compressor frequency.

[0076] The type of preset initial compressor frequency model is not unique. In a more specific embodiment, the preset initial compressor frequency model includes: P0=0T w0 2 +0T w0 +0, where P0 is the initial compressor frequency, T w0 is the initial water tank temperature, and A0, B0, and C0 are constants greater than 0. After the controller obtains the temperature of different positions of the water tank when the air-energy water heater is turned on, it is necessary to calculate the mean value according to each temperature. After obtaining the average value of the temperature, it is substituted as the initial water tank temperature into the preset initial compressor frequency model for analysis, and then the initial compressor frequency is determined.

[0077] It is understandable that the values ​​of A0, B0, and C0 are not unique, and may vary depending on the simulation results of actual experimental scenarios. For example, in a more detailed embodiment, they are 0.009, 0.008, and 39, respectively.

[0078] See also Figure 4 In one embodiment, step 104 includes step 402 and step 404 .

[0079] Step 402, determining a target compressor frequency model according to the water tank temperature and the ambient temperature.

[0080] Step 404, determining the compressor frequency according to the compressor exhaust temperature, the water tank temperature, the ambient temperature and the target compressor frequency model.

[0081] Specifically, in actual application scenarios, the air-to-water heater will have different requirements for the accuracy of the compressor frequency depending on the water tank temperature and the ambient temperature. In the solution of this embodiment, different target compressor frequency models are preset for calculating the compressor frequency. Therefore, when actually adjusting the compressor frequency, it is necessary to select the corresponding target compressor frequency model to calculate the compressor frequency based on the actual size of the currently obtained water tank temperature and ambient temperature. Through this setting, under different water tank temperatures and ambient temperatures, different target compressor frequency models are used to calculate the real-time required compressor frequency, thereby ensuring the accuracy of the compressor frequency calculation.

[0082] See also Figure 5 In one embodiment, the water tank temperature includes several water tank temperatures obtained by detecting several positions of the water tank; step 402 includes step 502, step 504 and step 506.

[0083] Step 502, determining a maximum water tank temperature among a plurality of water tank temperatures.

[0084] Step 504: If the ambient temperature is greater than the first preset temperature and the maximum water tank temperature is greater than or equal to the second preset temperature, determine that the target compressor frequency model is the first preset frequency model.

[0085] Step 506: If the ambient temperature is less than or equal to the first preset temperature, and / or the maximum water tank temperature is less than the second preset temperature, determine that the target compressor frequency model is the second preset frequency model.

[0086] Specifically, in the solution of this embodiment, after obtaining several water tank temperatures, the maximum water tank temperature is determined according to the several water tank temperatures during the adjustment cycle of the compressor frequency. It can be understood that in other embodiments, if there is only one water tank temperature, the water tank temperature is the maximum water tank temperature.

[0087] The controller pre-stores a first preset temperature and a second preset temperature. After determining the maximum water tank temperature, it is necessary to compare and analyze the maximum water tank temperature with the second preset temperature, and compare and analyze the ambient temperature with the first preset temperature. When the ambient temperature is greater than the first preset temperature and the maximum water tank temperature is greater than or equal to the second preset temperature, the target compressor frequency model is determined to be the first preset frequency model. Correspondingly, at this time, it is necessary to combine the compressor exhaust temperature, the water tank temperature, the ambient temperature and the first preset frequency model to determine the compressor frequency.

[0088] When the ambient temperature is less than or equal to the first preset temperature, or the maximum water tank temperature is less than the second preset temperature, the target compressor frequency model is determined to be the second preset frequency model. Correspondingly, the compressor frequency needs to be determined in combination with the water tank temperature, the ambient temperature and the second preset frequency model.

[0089] It should be noted that the magnitudes of the first preset temperature and the second preset temperature are not unique. In one embodiment, the first preset temperature may be set to be lower than the second preset temperature. In more detail, in one embodiment, the first preset temperature is 20°C and the second preset temperature is 40°C. In another embodiment, the first preset temperature may be set to be greater than 20°C or less than 20°C, and the second preset temperature may be set to be greater than 40°C or less than 40°C, without specific limitation.

[0090] The specific form of the first preset model is not unique. In one embodiment, the first preset frequency model includes: m =A1T w 2 +B1(T w -T p )+C1T e +D1, where P m is the compressor frequency, T w is the average temperature of several water tanks, T p is the compressor exhaust temperature, T e is the ambient temperature, A1, B1 and D1 are constants greater than 0, and C1 is a constant less than 0.

[0091] Specifically, after determining that the ambient temperature is greater than the first preset temperature and the maximum water tank temperature is greater than or equal to the second preset temperature, the controller substitutes the compressor exhaust temperature, the average value of several water tank temperatures and the ambient temperature into the first preset frequency model for calculation, and the compressor frequency required for the current cycle can be obtained. It can be understood that the sizes of A1, B1, C1 and D1 are not unique. In combination with the simulation results of the actual experimental environment, the sizes of A1, B1, C1 and D1 will also be different. For example, in a more detailed embodiment, A1, B1, C1 and D1 are 0.002, 2.5, -0.39 and 123 respectively.

[0092] Likewise, the specific form of the second preset model is not unique. In one embodiment, the second preset frequency model includes: m =A2T w 2 +A2T w +B2T e +C2, where P m is the compressor frequency, T wis the average temperature of several water tanks, T e is the ambient temperature, A2 and C2 are constants greater than 0, and B2 is a constant less than zero.

[0093] Specifically, after determining that the ambient temperature is less than or equal to the first preset temperature, and / or the maximum water tank temperature is less than the second preset temperature, the controller substitutes the average value of several water tank temperatures and the ambient temperature into the second preset frequency model for calculation, and the compressor frequency required for the current cycle can be obtained. It can be understood that the sizes of A2, B2 and C2 are not unique, and the sizes of A2, B2 and C2 will also be different in combination with the simulation results of the actual experimental environment. For example, in a more detailed embodiment, A2, B2 and C2 are 0.004, -0.8 and 62 respectively.

[0094] See also Figure 6 In one embodiment, the air energy water heater control method further includes step 602 , step 604 and step 606 .

[0095] Step 602, obtaining the compressor suction temperature of the air energy water heater and the pipe temperature between the air side heat exchanger and the electronic expansion valve.

[0096] Step 604, determining the opening change according to the compressor frequency, compressor suction temperature, pipe temperature, ambient temperature and compressor exhaust temperature.

[0097] Step 606, adjusting the opening of the electronic expansion valve of the air-energy water heater according to the opening change.

[0098] Specifically, the compressor suction temperature is the temperature of the compressor suction port. The compressor suction port of the air-energy water heater is provided with a suction temperature collector, through which the compressor suction temperature during the operation of the compressor can be collected in real time and sent to the controller. The air-side heat exchanger of the air-energy water heater is connected to the indoor heat exchanger through a refrigerant pipeline, and an electronic expansion valve is also provided on the refrigerant pipeline. A pipe temperature collector is provided on the refrigerant pipeline between the electronic expansion valve and the outdoor heat exchanger, and the pipe temperature can be collected in real time through the pipe temperature collector.

[0099] It can be understood that step 602 can be executed before step 102, or after step 102, or simultaneously with step 102, without any specific limitation, and can be set in combination with actual scenarios.

[0100] In the scheme of this embodiment, after the controller obtains the compressor suction temperature and the pipe temperature, it will combine the compressor exhaust temperature and the ambient temperature obtained during the compressor frequency adjustment, as well as the calculated compressor frequency, to further calculate the opening change, and adjust the opening of the electronic expansion valve accordingly according to the size of the opening change. That is, when the opening change is positive, the opening of the electronic expansion valve is increased; when the opening change is negative, the opening of the electronic expansion valve is reduced; when the opening change is 0, the opening of the electronic expansion valve is maintained unchanged.

[0101] In more detail, in one embodiment, the controller may be configured to use a certain duration as an opening adjustment cycle, and periodically combine the compressor frequency, compressor suction temperature, pipe temperature, ambient temperature and compressor exhaust temperature to determine the opening change and achieve the opening condition of the electronic expansion valve.

[0102] It is understood that the size of the opening adjustment period is not unique. In one embodiment, it can be set to be the same as the adjustment period of the compressor frequency; in another embodiment, it can be set to be different from the adjustment period of the compressor frequency, and the specific details are not limited. For example, in a more detailed embodiment, the opening adjustment period can be set to 40 seconds.

[0103] Likewise, the way of expressing the opening of the electronic expansion valve is not unique. In a more detailed embodiment, it can also be expressed in steps, that is, the steps of the stepper motor in the electronic expansion valve are controlled to make the electronic expansion valve operate at different openings.

[0104] The scheme of this embodiment, the opening adjustment of the electronic expansion valve also refers to the opening adjustment of the electronic expansion valve when the air-energy water heater is in the normal hot water production operation process. When the air-energy water heater is in the defrosting, oil return and other operating states, another control program is used to control the operation of the electronic expansion valve, which will not be repeated here.

[0105] In the above scheme, during the operation of the air-energy water heater to produce hot water, the opening of the electronic expansion valve is feedback-adjusted in combination with the compressor frequency, the compressor suction temperature and the pipe temperature, so that the operating state of the electronic expansion valve matches the compressor frequency, ensuring that the performance of the air-energy water heater is always maintained at the optimal value, further improving the operating reliability of the air-energy water heater.

[0106] In the solution of this embodiment, the opening adjustment of the electronic expansion valve is realized based on adjusting the compressor frequency according to the compressor exhaust temperature, the water tank temperature and the ambient temperature. It can be understood that in other embodiments, it can also be realized based on other ways of adjusting the compressor frequency, such as determining the compressor frequency according to the water tank temperature and the ambient temperature, etc., which is not specifically limited.

[0107] See also Figure 7In one embodiment, the method further includes step 702 and step 704.

[0108] Step 702, when the air-energy water heater is turned on, the initial opening degree is determined according to the initial ambient temperature and the initial water tank temperature when the air-energy water heater is turned on.

[0109] Step 704, controlling the electronic expansion valve to open and operate at an initial opening.

[0110] After the electronic expansion valve is opened and operated at the initial opening degree, if the second preset condition is met, the process periodically enters step 604 .

[0111] Specifically, the initial ambient temperature is the temperature of the environment in which the air-energy water heater is located when the air-energy water heater is turned on. The initial opening is the size of the opening required when the electronic expansion valve is initially turned on and operated. In the scheme of this embodiment, when the air-energy water heater unit is turned on, the controller first determines the initial opening in combination with the initial ambient temperature and the initial water tank temperature, and then controls the electronic expansion valve to operate at the initial opening until the operation meets the second preset condition, and then determines the opening change in combination with the compressor frequency, compressor suction temperature, pipe temperature, ambient temperature and compressor exhaust temperature, adjusts the opening of the electronic expansion valve, realizes segmented control of the electronic expansion valve, and improves the reliability of the start-up of the electronic expansion valve.

[0112] It can be understood that the specific type of the second preset condition is not unique. In a more detailed embodiment, the operation of the electronic expansion valve to meet the second preset condition includes: the time for the electronic expansion valve to be opened and operated reaches the second preset duration. That is, the scheme of this embodiment first controls the electronic expansion valve to open and operate for the second preset duration at an initial opening, and then adjusts the opening of the electronic expansion valve according to the compressor frequency, compressor suction temperature, pipe temperature, ambient temperature and compressor exhaust temperature. The size of the second preset duration is not unique. In a more detailed embodiment, the second preset duration can be set to be less than the first preset duration. For example, the second preset duration can be set to 2 minutes. In other embodiments, it can also be greater than 2 minutes or less than 2 minutes, without specific limitation.

[0113] See also Figure 8 In one embodiment, the initial opening degree is determined according to the initial ambient temperature and the initial water tank temperature when the air energy water heater is turned on, including step 802 and step 804.

[0114] Step 802: If the initial ambient temperature is lower than the third preset temperature, the initial opening is determined to be the preset opening.

[0115] Step 804: If the initial ambient temperature is greater than or equal to the third preset temperature, determine the initial opening degree according to the initial water tank temperature, the initial ambient temperature and the preset initial opening degree model.

[0116] Specifically, the scheme of this embodiment determines the initial opening in different ways according to different initial ambient temperatures. When the initial ambient temperature is less than the third preset temperature, the preset opening is directly used as the initial opening to control the electronic expansion valve to start operation. When the initial ambient temperature is greater than or equal to the third preset temperature, the initial opening needs to be determined in combination with the initial water tank temperature, the initial ambient temperature and the preset initial opening model. This scheme sets different initial opening determination methods for the air energy water heater according to different initial ambient temperatures to ensure the accuracy of the final initial opening.

[0117] It should be noted that the size of the preset opening is not unique, and can be set in combination with actual needs. For example, in a more detailed embodiment, the preset opening can be set to 200 (expressed in the number of steps of the stepping motor). Similarly, the size of the third preset temperature is not unique. In one embodiment, the third preset temperature can be set to 5°C, and in another embodiment, it can also be set to less than 5°C or greater than 5°C, without specific limitation.

[0118] The specific form of the preset initial opening model is not unique. In one embodiment, the preset initial opening model includes: K0=0T w0 +0T e0 +0, where K0 is the initial opening, T e0 is the initial ambient temperature, T w0 is the initial water tank temperature, a0 is a constant less than 0, b0 and c0 are constants greater than 0.

[0119] Specifically, when the initial ambient temperature is greater than or equal to the third preset temperature, the controller obtains an average value based on the temperature analysis of different positions of the water tank, and substitutes the average value as the initial water tank temperature and the initial ambient temperature into the preset initial opening model for calculation to obtain the initial opening, and finally controls the electronic expansion valve to open and operate at the initial opening. It should be noted that the values ​​of a0, b0 and c0 are not unique. In a more detailed embodiment, a0, b0 and c0 can be -2.2, 2 and 272 respectively.

[0120] See also Fig. 9 In one embodiment, step 604 includes step 902 and step 904.

[0121] Step 902: Determine the target suction superheat according to the ambient temperature and the compressor exhaust temperature.

[0122] Step 904: Determine the opening change according to the compressor frequency, the compressor suction temperature, the pipe temperature and the target suction superheat.

[0123] Specifically, the suction superheat is the difference between the suction temperature of the compressor and the saturation temperature corresponding to the suction pressure. In the solution of this embodiment, when calculating the opening change, the target suction superheat of the current opening adjustment cycle is first determined in combination with the ambient temperature and the compressor exhaust temperature, and then the target suction superheat, compressor frequency, compressor suction temperature and pipe temperature are analyzed and calculated to obtain the opening change.

[0124] It should be pointed out that there is not only one way to obtain the target intake superheat. In one embodiment, the controller pre-stores the correspondence between the compressor exhaust temperature, the ambient temperature and the target intake superheat. Based on the obtained compressor exhaust temperature and ambient temperature, a matching analysis is performed to obtain the target intake superheat.

[0125] The correspondence between the compressor exhaust temperature, the ambient temperature and the target suction superheat is not unique. For example, in a more detailed embodiment, the correspondence between the compressor exhaust temperature, the ambient temperature and the target suction superheat is shown in the following table:

[0126]

[0127] Among them, T p is the compressor exhaust temperature (°C), T e is the ambient temperature (°C), and G1-G5 are integers ranging from 0 to 5.

[0128] See also Fig.10 In one embodiment, step 904 includes step 101 and step 103.

[0129] Step 101, determining a frequency change amount according to the compressor frequency of the current opening adjustment cycle and the compressor frequency of the previous opening adjustment cycle.

[0130] Step 103, determining the opening degree change according to the frequency change, the compressor suction temperature, the pipe temperature and the target suction superheat.

[0131] Specifically, when analyzing the opening change, it is necessary to first determine the frequency change by combining the compressor frequency in the current opening adjustment cycle with the compressor frequency in the previous opening adjustment cycle, and then determine the actual opening change required by the frequency change, compressor suction temperature, pipe temperature and target suction superheat. Through this adjustment method, the opening change is associated with the frequency change, ensuring that the opening of the electronic expansion valve changes according to the change of the compressor frequency, further improving the operating reliability of the air energy water heater.

[0132] It can be understood that in one embodiment, when calculating the opening change amount in the first opening adjustment cycle, since there is no compressor frequency in the previous opening adjustment cycle for comparison, the opening change amount can be determined with the frequency change amount being zero at this time. In other embodiments, the compressor frequency in the current opening adjustment cycle can also be subtracted from the compressor frequency one opening adjustment cycle before to obtain the opening change amount, and the specific method is not limited.

[0133] Please refer to Fig.11 , in one embodiment, step 103 includes step 112.

[0134] Step 112, determine the opening change amount according to the frequency change amount, the compressor suction temperature, the pipe temperature, the target suction superheat degree, and the preset opening change model.

[0135] Specifically, the preset opening change model represents the corresponding relationship between the frequency change amount, the compressor suction temperature, the pipe temperature, the target suction superheat degree, and the opening change amount. After the controller analyzes and obtains the frequency change amount and the target suction superheat degree, substituting the frequency change amount, the compressor suction temperature, the pipe temperature, and the target suction superheat degree into the preset opening change model for calculation can obtain the opening change amount.

[0136] It should be noted that the specific type of the preset opening model is not unique. In one embodiment, the preset opening change model includes: Δk = a1ΔP + b1T x - c1T g - d1T M , where Δk is the opening change amount, ΔP is the frequency change amount, T x is the compressor suction temperature, T g is the pipe temperature, T M is the target suction superheat degree, 0 < a1 < 1, and b1, c1, and d1 are constants greater than 0.

[0137] Through the solution of this embodiment, substituting the frequency change amount, the compressor suction temperature, the pipe temperature, and the target suction superheat degree into the preset opening change model for calculation to obtain the opening change amount, and the controller can correspondingly increase or decrease the opening of the electronic expansion valve according to the opening change amount. It should be noted that the magnitudes of a1, b1, c1, and d1 are not unique. In a more detailed embodiment, a1 is set to 0.5, and b1, c1, and d1 are set to 1.

[0138] To facilitate the understanding of the technical solution of the present application, the present application will be explained below with reference to a more detailed embodiment.

[0139] When the air energy water heater is powered on and running, the initial ambient temperature and the temperature at different positions of the water tank are collected through the ambient temperature collector and the water tank temperature collector. The controller calculates the average value based on the temperature at different positions of the water tank as the initial water tank temperature and substitutes it into the preset initial compressor frequency model P0=A0T w0 2 +B0T w0 +C0 is calculated to obtain the initial compressor frequency. At the same time, the controller also determines the initial opening according to the initial ambient temperature and the preset third temperature (5°C). When the initial ambient temperature is less than 5°C, the initial opening is set to the preset opening (expressed as 200 in terms of the stepper motor step length). When the initial ambient temperature is greater than or equal to 5°C, the average value of the initial ambient temperature and the initial water tank temperature is substituted into K0=a0T w0 +b0T e0 +c0 is calculated to obtain the initial opening degree. Finally, the compressor is controlled to start running at the initial compressor frequency, and the electronic expansion valve is opened and operated at the initial opening degree.

[0140] After the compressor and the electronic expansion valve are turned on, the controller receives the exhaust temperature collector, the suction temperature collector, the pipe temperature collector, the ambient temperature collector and the water tank temperature collector, and respectively collects the compressor exhaust temperature, the compressor suction temperature, the pipe temperature, the ambient temperature and the water tank temperature. When the compressor is turned on and runs at the initial compressor frequency for a first preset time (3 minutes), the controller combines the currently acquired ambient temperature and water tank temperature analysis to determine the appropriate target compressor frequency model. When the ambient temperature is greater than the first preset temperature (20°C) and the maximum water tank temperature among the water tank temperatures is greater than or equal to the second preset temperature (40°C), the average value of the ambient temperature, the compressor exhaust temperature and the water tank temperature is substituted into P m =A1T w 2 +B1(T w -T p )+C1T e +D1 is calculated to obtain the compressor frequency. When the ambient temperature is less than or equal to the first preset temperature, and / or the maximum water tank temperature among the water tank temperatures is less than the second preset temperature, the average value of the ambient temperature and the water tank temperature is substituted into P m =A2T w 2 +A2T w +B2T e+C2 is used to calculate and obtain the compressor frequency. Whenever a compressor frequency adjustment cycle (which can be set to 2 minutes) is reached, the controller will compare and analyze the ambient temperature and the maximum water tank temperature with the first preset temperature and the second preset temperature respectively, and select the corresponding target compressor frequency model according to the comparison and analysis results to calculate the compressor frequency, thereby periodically adjusting the compressor frequency.

[0141] After the electronic expansion valve runs at the initial opening for the second preset time (2 minutes), the electronic expansion valve will obtain the frequency change based on the currently acquired compressor frequency and the compressor frequency before an electronic expansion valve adjustment cycle (which can be 40 seconds). Combined with the currently acquired compressor exhaust temperature and ambient temperature, the corresponding relationship between the preset compressor exhaust temperature, ambient temperature and target suction superheat is matched to obtain the target suction superheat required under the current state. Finally, the controller substitutes the frequency change, compressor suction temperature, pipe temperature and target suction superheat into Δk=a1ΔP+b1T x -c1T g -d1T M In this process, the controller calculates the opening change in real time according to the above method with a period of 40 seconds, and when the opening change is not 0, the opening of the electronic expansion valve is periodically adjusted in combination with the opening change.

[0142] Based on the same inventive concept, the embodiment of the present application also provides an air-energy water heater control device for implementing the air-energy water heater control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more air-energy water heater control device embodiments provided below can refer to the limitations of the air-energy water heater control method above, and will not be repeated here.

[0143] See also Fig.12 , an air energy water heater control device, including a parameter acquisition module 122, a frequency determination module 124 and a frequency adjustment module 126.

[0144] The parameter acquisition module 122 is used to obtain the compressor exhaust temperature, water tank temperature and ambient temperature of the air-energy water heater; the frequency determination module 124 is used to determine the compressor frequency according to the compressor exhaust temperature, water tank temperature and ambient temperature; the frequency adjustment module 126 is used to control the compressor of the air-energy water heater to operate at the compressor frequency.

[0145] See also Fig.13In one embodiment, the device further includes a compressor start control module 132. The compressor start control module 132 is used to obtain the initial water tank temperature when the air energy water heater is turned on; determine the initial compressor frequency according to the initial water tank temperature; control the compressor of the air energy water heater to start running at the initial compressor frequency; after the compressor starts running at the initial compressor frequency, if the first preset condition is met, periodically control the frequency determination module 124 to perform the operation of determining the compressor frequency according to the compressor exhaust temperature, the water tank temperature and the ambient temperature.

[0146] In one embodiment, the compressor startup control module 132 is further configured to determine an initial compressor frequency according to an initial water tank temperature and a preset initial compressor frequency model.

[0147] In one embodiment, the frequency determination module 124 is further used to determine a target compressor frequency model according to the water tank temperature and the ambient temperature; and to determine the compressor frequency according to the compressor exhaust temperature, the water tank temperature, the ambient temperature and the target compressor frequency model.

[0148] In one embodiment, the frequency determination module 124 is also used to determine the maximum water tank temperature among several water tank temperatures; if the ambient temperature is greater than the first preset temperature, and the maximum water tank temperature is greater than or equal to the second preset temperature, the target compressor frequency model is determined to be the first preset frequency model; if the ambient temperature is less than or equal to the first preset temperature, and / or the maximum water tank temperature is less than the second preset temperature, the target compressor frequency model is determined to be the second preset frequency model.

[0149] See also Fig.14 In one embodiment, the air energy water heater control device further includes an opening adjustment module 142. The parameter acquisition module 122 is also used to obtain the compressor suction temperature of the air energy water heater and the pipe temperature between the air side heat exchanger and the electronic expansion valve. The opening adjustment module 142 is used to determine the opening change according to the compressor frequency, the compressor suction temperature, the pipe temperature, the ambient temperature and the compressor exhaust temperature; and adjust the opening of the electronic expansion valve of the air energy water heater according to the opening change.

[0150] See also Fig.15 In one embodiment, the device further includes an electronic expansion valve opening module 152. The electronic expansion valve opening module 152 is used to determine the initial opening degree according to the initial ambient temperature and the initial water tank temperature when the air energy water heater is turned on; control the electronic expansion valve to open and operate at the initial opening degree; after the electronic expansion valve is opened and operated at the initial opening degree, if the second preset condition is met, periodically control the opening degree adjustment module 142 to perform the operation of determining the opening degree change amount according to the compressor frequency, the compressor suction temperature, the pipe temperature, the ambient temperature and the compressor exhaust temperature.

[0151] In one embodiment, the electronic expansion valve opening module 152 is also used to determine the initial opening as a preset opening if the ambient temperature is lower than a third preset temperature; if the ambient temperature is greater than or equal to the third preset temperature, determine the initial opening according to the water tank temperature, the ambient temperature and the preset initial opening model.

[0152] In one embodiment, the opening adjustment module 142 is further used to determine the target suction superheat according to the ambient temperature and the compressor exhaust temperature; and to determine the opening change according to the compressor frequency, the compressor suction temperature, the pipe temperature and the target suction superheat.

[0153] In one embodiment, the opening adjustment module 142 is also used to determine the frequency change according to the compressor frequency of the current opening adjustment cycle and the compressor frequency of the previous opening adjustment cycle; and determine the opening change according to the frequency change, the compressor suction temperature, the pipe temperature and the target suction superheat.

[0154] In one embodiment, the opening adjustment module 142 is further configured to determine the opening change amount according to the frequency change amount, the compressor suction temperature, the pipe temperature, the target suction superheat and a preset opening change model.

[0155] Each module in the above air energy water heater control device can be implemented in whole or in part by software, hardware and their combination. Each module can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0156] The above-mentioned air-energy water heater control device obtains the compressor exhaust temperature, water tank temperature and ambient temperature of the air-energy water heater, and determines the compressor frequency in combination with the obtained compressor exhaust temperature, water tank temperature and ambient temperature, and finally controls the compressor of the air-energy water heater to operate at the determined compressor frequency. This solution can determine the currently required compressor frequency in combination with the compressor exhaust temperature during the operation of the air-energy water heater, so that the compressor frequency changes in time with the load change, alleviates the situation where the compressor frequency is over-adjusted and causes shutdown protection when the load of the air-energy water heater changes sharply, and improves the operating reliability of the air-energy water heater.

[0157] See also Fig.16An air energy water heater comprises: an ambient temperature collector 161, an exhaust temperature collector 162, a water tank temperature collector 163, an air side heat exchanger 164, a water side heat exchanger 165, a water tank 166, a compressor 167, an electronic expansion valve 168, a four-way valve 169 and a controller (not shown), the water side heat exchanger 165 and the water tank temperature collector 163 are respectively arranged on the water tank 166, the exhaust temperature collector 162 is arranged on the exhaust port of the compressor 167, the ambient temperature collector 161 is arranged on the air side heat exchanger 164, the exhaust port of the compressor 167 The air port is connected to the first end of the four-way valve 169, the air intake port of the compressor 167 is connected to the second end of the four-way valve 169, the third end of the four-way valve 169 is connected to the air side heat exchanger 164, the air side heat exchanger 164 is connected to the water side heat exchanger 165 through the electronic expansion valve 168, the fourth end of the four-way valve 169 is connected to the water side heat exchanger 165, the electronic expansion valve 168, the ambient temperature collector 161, the exhaust temperature collector 162, the water tank temperature collector 163 and the four-way valve 169 are respectively connected to the controller, and the controller is used to execute the above-mentioned air energy water heater control method.

[0158] Specifically, the air-energy water heater control method is as shown in the above-mentioned embodiments and the accompanying drawings, and will not be repeated here. The above-mentioned air-energy water heater obtains the compressor exhaust temperature, water tank temperature and ambient temperature of the air-energy water heater, and determines the compressor frequency in combination with the obtained compressor exhaust temperature, water tank temperature and ambient temperature, and finally controls the compressor 167 of the air-energy water heater to operate at the determined compressor frequency. This scheme, during the operation of the air-energy water heater, can periodically determine the currently required compressor frequency in combination with the compressor exhaust temperature, so that the compressor frequency changes in time with the change of load, alleviates the situation where the compressor frequency is over-adjusted and causes shutdown protection when the load of the air-energy water heater changes sharply, and improves the operating reliability of the air-energy water heater.

[0159] Please continue reading Fig.16 In one embodiment, the air intake port of the compressor 167 of the air-energy water heater is provided with an air intake temperature collector 170, through which the compressor intake temperature of the compressor 167 during operation can be collected in real time and sent to the controller. The air-side heat exchanger 164 of the air-energy water heater is connected to the indoor heat exchanger through a refrigerant pipeline, and an electronic expansion valve 168 is also provided on the refrigerant pipeline. A pipe temperature collector 171 is provided on the refrigerant pipeline between the electronic expansion valve 168 and the outdoor heat exchanger, and the pipe temperature can be collected in real time through the pipe temperature collector 171. The scheme of this embodiment also combines the compressor frequency, the compressor intake temperature and the pipe temperature to feedback adjust the opening of the electronic expansion valve 168, so that the operating state of the electronic expansion valve 168 matches the compressor frequency, ensures that the performance of the air-energy water heater always maintains the optimal value, and further improves the operating reliability of the air-energy water heater.

[0160] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0161] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A method for controlling an air energy water heater, characterized in that: include: Obtain the compressor exhaust temperature, water tank temperature and ambient temperature of the air energy water heater; Determining a compressor frequency according to the compressor exhaust temperature, the water tank temperature and the ambient temperature; Controlling the compressor of the air energy water heater to operate at the compressor frequency; The determining of the compressor frequency according to the compressor exhaust temperature, the water tank temperature and the ambient temperature includes: if the ambient temperature is greater than a first preset temperature and the maximum water tank temperature is greater than or equal to a second preset temperature, determining the target compressor frequency model to be the first preset frequency model; If the ambient temperature is less than or equal to the first preset temperature, and / or the maximum water tank temperature is less than the second preset temperature, determining that the target compressor frequency model is a second preset frequency model; Periodically combining the target compressor frequency model, the most recently acquired compressor exhaust temperature, the water tank temperature and the ambient temperature to perform analysis and calculation to obtain the compressor frequency; The first preset frequency model includes: m =A1T w 2 +B1(T w -T p )+C1T e +D1, where P m is the compressor frequency, T w is the average temperature of several water tanks, T p is the compressor exhaust temperature, T e is the ambient temperature, A1, B1 and D1 are constants greater than 0, and C1 is a constant less than 0; And / or, the second preset frequency model includes: m =A2T w 2 +A2T w +B2t e +C2, where P m is the compressor frequency, T w is the average temperature of several water tanks, T e is the ambient temperature, A2 and C2 are constants greater than 0, and B2 is a constant less than zero.

2. The air energy water heater control method according to claim 1, characterized in that: The method further comprises: When the air-energy water heater is turned on, obtaining the initial water tank temperature of the air-energy water heater when it is turned on; determining an initial compressor frequency according to the initial water tank temperature; Controlling the compressor of the air energy water heater to start running at the initial compressor frequency; After the compressor is started to run at the initial compressor frequency, when a first preset condition is met, the step of determining the compressor frequency according to the compressor exhaust temperature, the water tank temperature and the ambient temperature is periodically entered.

3. The air energy water heater control method according to claim 2, characterized in that: The determining the initial compressor frequency according to the initial water tank temperature comprises: The initial compressor frequency is determined according to the initial water tank temperature and a preset initial compressor frequency model.

4. The air energy water heater control method according to claim 3, characterized in that: The preset initial compressor frequency model includes: P0=A0T w0 2 +B0T w0 +C0 Where P0 is the initial compressor frequency, T w0 is the initial water tank temperature, A0, B0, C0 are constants greater than 0.

5. The air energy water heater control method according to claim 1, characterized in that: The water tank temperature includes several water tank temperatures obtained by detecting several positions of the water tank; The step of determining a target compressor frequency model according to the water tank temperature and the ambient temperature further comprises: A maximum water tank temperature among the plurality of water tank temperatures is determined.

6. The air energy water heater control method according to any one of claims 1 to 5, characterized in that: The method further comprises: Obtain the compressor suction temperature of the air energy water heater and the pipe temperature between the air side heat exchanger and the electronic expansion valve; Determining the opening change amount according to the compressor frequency, the compressor suction temperature, the pipe temperature, the ambient temperature and the compressor exhaust temperature; The opening degree of the electronic expansion valve of the air energy water heater is adjusted according to the opening degree change.

7. The air energy water heater control method according to claim 6, characterized in that: The method further comprises: When the air energy water heater is turned on, the initial opening degree is determined according to the initial ambient temperature and the initial water tank temperature when the air energy water heater is turned on; Controlling the electronic expansion valve to open and operate at the initial opening degree; After the electronic expansion valve is opened and operated with the initial opening, when the second preset condition is met, the step of determining the opening change amount according to the compressor frequency, the compressor suction temperature, the pipe temperature, the ambient temperature and the compressor exhaust temperature is periodically entered.

8. The air energy water heater control method according to claim 7, characterized in that: The step of determining the initial opening degree according to the initial ambient temperature and the initial water tank temperature when the air energy water heater is turned on includes: If the initial ambient temperature is lower than a third preset temperature, determining the initial opening to be a preset opening; If the initial ambient temperature is greater than or equal to the third preset temperature, the initial opening is determined according to the initial water tank temperature, the initial ambient temperature and a preset initial opening model.

9. The air energy water heater control method according to claim 8, characterized in that: The preset initial opening model includes: K0=a0T w0 +b0T e0 +c0 Among them, K0 is the initial opening, T e0 is the initial ambient temperature, T w0 is the initial water tank temperature, a0 is a constant less than 0, b0 and c0 are constants greater than 0.

10. The air energy water heater control method according to claim 6, characterized in that: The step of determining the opening change according to the compressor frequency, the compressor suction temperature, the pipe temperature, the ambient temperature and the compressor exhaust temperature comprises: Determining a target suction superheat according to the ambient temperature and the compressor exhaust temperature; The opening degree change amount is determined according to the compressor frequency, the compressor suction temperature, the pipe temperature and the target suction superheat.

11. The air energy water heater control method according to claim 10, characterized in that: The step of determining the opening degree change according to the compressor frequency, the compressor suction temperature, the pipe temperature and the target suction superheat comprises: Determine the frequency change according to the compressor frequency of the current opening adjustment cycle and the compressor frequency of the previous opening adjustment cycle; The opening degree change is determined according to the frequency change, the compressor suction temperature, the pipe temperature and the target suction superheat.

12. The air energy water heater control method according to claim 11, characterized in that: The step of determining the opening degree change according to the frequency change, the compressor suction temperature, the pipe temperature and the target suction superheat comprises: The opening degree change amount is determined according to the frequency change amount, the compressor suction temperature, the pipe temperature, the target suction superheat and a preset opening degree change model.

13. The air energy water heater control method according to claim 12, characterized in that: The preset opening degree change model includes: Δk=a1ΔP+b1T x -c1T g -d1T M Among them, Δk is the change in opening, ΔP is the change in frequency, T x is the compressor suction temperature, T g is the tube temperature, T M is the target suction superheat, 0<a1<1, b1, c1 and d1 are constants greater than 0.

14. An air energy water heater control device, characterized in that: include: A parameter acquisition module, used to obtain the compressor exhaust temperature, water tank temperature and ambient temperature of the air energy water heater; A frequency determination module, used to determine the compressor frequency according to the compressor exhaust temperature, the water tank temperature and the ambient temperature; A frequency adjustment module, used for controlling the compressor of the air energy water heater to operate at the compressor frequency; The frequency determination module is also used to determine that the target compressor frequency model is the first preset frequency model if the ambient temperature is greater than the first preset temperature and the maximum water tank temperature is greater than or equal to the second preset temperature; if the ambient temperature is less than or equal to the first preset temperature, and / or the maximum water tank temperature is less than the second preset temperature, determine that the target compressor frequency model is the second preset frequency model; periodically combine the target compressor frequency model, the most recently acquired compressor exhaust temperature, the water tank temperature and the ambient temperature to perform analysis and calculation to obtain the compressor frequency; The first preset frequency model includes: m =A1T w 2 +B1(T w -T p )+C1T e +D1, where P m is the compressor frequency, T w is the average temperature of several water tanks, T p is the compressor exhaust temperature, T e is the ambient temperature, A1, B1 and D1 are constants greater than 0, and C1 is a constant less than 0; and / or, the second preset frequency model includes: P m =A2T w 2 +A2T w +B2T e +C2, where P m is the compressor frequency, T w is the average temperature of several water tanks, T e is the ambient temperature, A2 and C2 are constants greater than 0, and B2 is a constant less than zero.

15. An air energy water heater, characterized in that: include: An ambient temperature collector, an exhaust temperature collector, a water tank temperature collector, an air-side heat exchanger, a water-side heat exchanger, a water tank, a compressor, an electronic expansion valve, a four-way valve and a controller, wherein the water-side heat exchanger and the water tank temperature collector are respectively arranged on the water tank, the exhaust temperature collector is arranged on the exhaust port of the compressor, the ambient temperature collector is arranged on the air-side heat exchanger, the exhaust port of the compressor is connected to the first end of the four-way valve, the air intake port of the compressor is connected to the second end of the four-way valve, the third end of the four-way valve is connected to the air-side heat exchanger, the air-side heat exchanger is connected to the water-side heat exchanger through the electronic expansion valve, the fourth end of the four-way valve is connected to the water-side heat exchanger, the electronic expansion valve, the ambient temperature collector, the exhaust temperature collector, the water tank temperature collector and the four-way valve are respectively connected to the controller, and the controller is used to execute the air-energy water heater control method described in any one of claims 1 to 13.

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