Enthalpy-increasing electronic expansion valve control method, device and air source heat pump unit system

Abstract

This invention relates to the field of heat pump control technology, and discloses a method, device, and air source heat pump unit system for controlling an enthalpy-increasing electronic expansion valve. The method includes: determining whether the enthalpy-increasing electronic expansion valve needs to be opened based on the operating status of the heat pump unit; when the enthalpy-increasing electronic expansion valve needs to be opened, detecting the ambient temperature and outlet water temperature of the heat pump unit's main equipment, and determining the initial opening degree of the enthalpy-increasing electronic expansion valve based on the ambient temperature and outlet water temperature; controlling the enthalpy-increasing electronic expansion valve to open at the initial opening degree and maintaining it for a preset time until the main equipment operates stably, then entering an adjustment mode to adjust the opening degree of the enthalpy-increasing electronic expansion valve according to the unit's operating status; if a preset special situation is detected during the maintenance period, entering the adjustment mode in advance to adjust the opening degree of the enthalpy-increasing electronic expansion valve. This invention can improve the response speed of the enthalpy-increasing electronic expansion valve and avoid the problems of excessively rapid rise in exhaust temperature or insufficient exhaust superheat of the heat pump unit.

Description

Technical Field

[0001] This invention relates to the field of heat pump control technology, specifically to a method, device, and air source heat pump unit system for controlling an enthalpy-increasing electronic expansion valve. Background Technology

[0002] In variable frequency ultra-low temperature air source heat pump applications using R32 refrigerant (difluoromethane), high exhaust temperature is one of the control challenges. Current technology typically adjusts the enthalpy-increasing electronic expansion valve based on the enthalpy increase. For example, if the actual detected enthalpy increase deviates from the target enthalpy increase by a preset deviation, the opening of the enthalpy-increasing electronic expansion valve needs to be adjusted to meet the target enthalpy superheat. This conventional adjustment method usually occurs in the following situations:

[0003] 1. During the high water temperature start-up process, the overall refrigerant circulation volume is insufficient in the low frequency range, and the enthalpy increase gas supply is insufficient, resulting in high exhaust temperature;

[0004] 2. Different operating conditions require different initial opening degrees for enthalpy increase. High water temperature exhaust temperature is higher, so a larger opening degree for enthalpy increase is required to increase the amount of supplementary air and reduce exhaust.

[0005] 3. During startup, the system is in an unsteady state, and the exhaust temperature rises rapidly, requiring the enthalpy-increasing electronic expansion valve to adjust quickly. However, during stable operation, the system is in a relatively steady state, and the exhaust temperature changes slowly, requiring the enthalpy-increasing electronic expansion valve to adjust slowly. Summary of the Invention

[0006] In view of this, the present invention provides a method, apparatus and equipment for controlling an enthalpy-increasing electronic expansion valve, in order to solve the problem of how to improve the response speed of the enthalpy-increasing electronic expansion valve and avoid the problem of the exhaust temperature of the heat pump unit rising too quickly or the exhaust superheat being insufficient.

[0007] In a first aspect, the present invention provides a method for controlling an enthalpy-increasing electronic expansion valve, the method comprising:

[0008] Determine whether the enthalpy-increasing electronic expansion valve needs to be opened based on the operating status of the heat pump unit;

[0009] When the enthalpy-increasing electronic expansion valve needs to be opened, the ambient temperature and outlet water temperature of the heat pump unit are detected, and the initial opening degree of the enthalpy-increasing electronic expansion valve is determined based on the ambient temperature and outlet water temperature.

[0010] After the main equipment is stabilized by controlling the enthalpy-increasing electronic expansion valve to open at the initial opening degree and maintain it for a preset time, the opening degree of the enthalpy-increasing electronic expansion valve is adjusted according to the unit's operating status. If a preset special situation is detected during the maintenance period, the adjustment mode is entered in advance to adjust the opening degree of the enthalpy-increasing electronic expansion valve.

[0011] The enthalpy-increasing electronic expansion valve control method provided in this invention can modify the initial opening degree of the enthalpy-increasing electronic expansion valve according to different water temperatures and ambient temperatures, which can meet the usage requirements under different application conditions, allow the unit to quickly reach a stable state, and adjust the opening degree according to the unit's operating conditions, thereby adjusting the response speed of the enthalpy-increasing valve in a timely manner. At the same time, it can also avoid the problem of excessively rapid rise in exhaust temperature or insufficient exhaust superheat.

[0012] In one optional implementation, the enthalpy-increasing electronic expansion valve is determined to need to be opened when the operating state of the heat pump unit meets preset conditions, the preset conditions including:

[0013] When the host device is powered on and in non-defrost mode;

[0014] And the current exhaust temperature T of the heat pump unit equipment 排 ≥ Set value T0, and exhaust temperature T 排 The maintenance time exceeds the first preset time, or the exhaust temperature T 排 The temperature rise exceeds the preset temperature threshold within the second preset time period.

[0015] When opening the enthalpy-increasing electronic expansion valve in this embodiment of the invention, it is necessary to ensure that the unit is in non-defrosting mode, because defrosting mode is non-steady-state operation. If the enthalpy-increasing electronic expansion valve is opened at this time, it is easy to cause a large amount of liquid return to the unit, resulting in compressor wear. At the same time, it is also necessary to ensure that the exhaust temperature of the unit is at a relatively high level. Usually, when the exhaust temperature of the heat pump unit is high, opening the enthalpy-increasing electronic expansion valve to allow the enthalpy-increasing circuit to replenish gas / liquid can effectively reduce the exhaust temperature of the unit and ensure that the unit will not affect the overall safety due to excessively high exhaust temperature.

[0016] In one optional implementation, determining the initial opening degree of the enthalpy-increasing electronic expansion valve based on the ambient temperature and the outlet water temperature includes:

[0017] Based on the relationship between the preset outlet water temperature and the initial opening degree of the enthalpy-increasing electronic expansion valve, and according to the detected outlet water temperature T... 出 Calculate the initial opening E1 of the theoretically enthalpy-increasing electronic expansion valve;

[0018] Based on the pre-set relationship between ambient temperature and the initial opening correction coefficient for enthalpy increase, according to the detected ambient temperature T 环 Calculate the initial opening correction factor k of the enthalpy-increasing electronic expansion valve;

[0019] The actual initial opening E of the enthalpy-increasing electronic expansion valve is obtained based on the theoretical initial opening E1 and the initial opening correction coefficient k. 增 = k*E1.

[0020] According to different application conditions, the opening of the enthalpy-increasing electronic expansion valve can be adjusted to make the system more stable more quickly and avoid the problem that the enthalpy-increasing electronic expansion valve cannot respond quickly to sudden changes in load, resulting in excessively high exhaust temperature or insufficient exhaust superheat.

[0021] In one optional implementation, the preset special case includes:

[0022] Current exhaust temperature T of heat pump unit equipment 排 ≥T 排气温度保护设定值 -t, where t is a safety margin; and / or exhaust superheat ≤ T 排气过热度过低设定值。

[0023] This invention embodiment monitors the enthalpy-increasing electronic expansion valve in real time to maintain its initial opening. When the above special conditions are detected, timely adjustments are made to prevent excessively high exhaust temperature and insufficient exhaust superheat.

[0024] In one alternative implementation, the process of adjusting the opening of the enthalpy-increasing electronic expansion valve in the adjustment mode includes:

[0025] The current enthalpy-increasing superheat temperature T is calculated by acquiring the inlet temperature T1 and outlet temperature T2 of the economizer on the enthalpy-increasing side at the first preset time interval. j =T2-T1;

[0026] Based on the correspondence between the preset outlet water temperature and the adjustment correction coefficient of the enthalpy-increasing electronic expansion valve, the adjustment correction coefficient of the enthalpy-increasing electronic expansion valve is obtained based on the detected outlet water temperature.

[0027] The change in the opening degree of the electronic expansion valve is determined based on the preset adjustment amount of the electronic expansion valve, the correction coefficient of the adjustment amount of the electronic expansion valve, the current enthalpy superheat temperature, the target enthalpy superheat, the exhaust temperature, and the outlet water temperature.

[0028] The opening of the enthalpy-increasing electronic expansion valve is adjusted based on the change in the opening of the enthalpy-increasing electronic expansion valve.

[0029] In this embodiment of the invention, the adjustment amount of the enthalpy-increasing electronic expansion valve is determined by the enthalpy-increasing superheat, the target enthalpy-increasing superheat, the enthalpy-increasing valve adjustment amount correction coefficient, and the exhaust superheat correction value. With the assistance of water temperature and exhaust superheat, the response speed of the enthalpy-increasing valve can be adjusted in a timely manner. In non-steady-state conditions, it can quickly resolve enthalpy-increasing valve problems and also avoid the problem of excessively rapid rise in exhaust temperature.

[0030] In one alternative implementation, the change in the opening of the enthalpy-increasing electronic expansion valve, ΔE, is calculated using the following formula:

[0031] △E=E T *k T *(T j -Tq )+△P

[0032] Among them, E T To preset the adjustment amount of the electronic expansion valve for increasing enthalpy, k T Correction coefficient for adjustment amount of enthalpy-increasing electronic expansion valve, T q The target enthalpy superheat is defined as ΔP, where ΔP is the exhaust superheat correction value, and exhaust superheat Tu = exhaust temperature T. 排 -Outlet water temperature T 出 When Tu ≥ the set value Tp, △P is the set value Ty; when Tu < the set value Tp, △P is 0.

[0033] The opening of the enthalpy-increasing electronic expansion valve is adjusted according to a second preset time period, which is longer than the first preset time period. The opening of the enthalpy-increasing electronic expansion valve is adjusted according to the following formula:

[0034] E 后 =E 前 +△E

[0035] E 后 The adjusted opening of the enthalpy-increasing electronic expansion valve;

[0036] E 前 The opening degree of the electronic expansion valve is increased for the previous time period.

[0037] In this embodiment of the invention, the time period for adjusting the enthalpy-increasing electronic expansion valve is longer than the time period for calculating the enthalpy-increasing superheat. This is because it is necessary to allow for a reaction time for the opening adjustment, so as to ensure that there will not be too much parameter fluctuation during the adjustment process.

[0038] In a second aspect, the present invention provides an enthalpy-increasing electronic expansion valve control device, the device comprising:

[0039] The valve opening judgment module is used to determine whether the enthalpy-increasing electronic expansion valve needs to be opened based on the operating status of the heat pump unit.

[0040] The valve initial opening degree determination module is used to detect the ambient temperature and outlet water temperature of the heat pump unit main equipment when the enthalpy-increasing electronic expansion valve needs to be opened, and determine the initial opening degree of the enthalpy-increasing electronic expansion valve based on the ambient temperature and outlet water temperature.

[0041] The valve opening adjustment module is used to control the enthalpy-increasing electronic expansion valve to open at the initial opening and maintain it for a preset time until the main equipment is running stably. Then, it enters the adjustment mode according to the unit's operating status to adjust the opening of the enthalpy-increasing electronic expansion valve. If a preset special situation is detected during the maintenance period, it enters the adjustment mode in advance to adjust the opening of the enthalpy-increasing electronic expansion valve.

[0042] Thirdly, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the enthalpy-increasing electronic expansion valve control method of the first aspect or any corresponding embodiment described above.

[0043] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the enthalpy-increasing electronic expansion valve control method of the first aspect or any corresponding embodiment thereof.

[0044] Fifthly, the present invention provides a computer program product, including computer instructions for causing a computer to execute the enthalpy-increasing electronic expansion valve control method of the first aspect or any corresponding embodiment thereof.

[0045] Sixthly, an air source heat pump unit system includes: an enthalpy-increasing electronic expansion valve and the computer equipment described in the third aspect. Attached Figure Description

[0046] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0047] Figure 1 This is a schematic flowchart of the enthalpy-increasing electronic expansion valve control method according to an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the exhaust temperature detection location according to an embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of the relationship between the outlet water temperature and the initial opening degree of the enthalpy-increasing electronic expansion valve according to an embodiment of the present invention;

[0050] Figure 4 This is a schematic diagram of the relationship between ambient temperature and the correction coefficient for the initial opening of the enthalpy-increasing electronic expansion valve, according to an embodiment of the present invention.

[0051] Figure 5 This is a schematic diagram of the detection positions of the inlet temperature T1 and outlet temperature T2 on the enthalpy-increasing side of the economizer according to an embodiment of the present invention;

[0052] Figure 6This is a schematic diagram of the relationship between the outlet water temperature and the adjustment correction coefficient of the enthalpy-increasing electronic expansion valve according to an embodiment of the present invention;

[0053] Figure 7 This is a structural block diagram of an enthalpy-increasing electronic expansion valve control device according to an embodiment of the present invention;

[0054] Figure 8 This is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] This invention provides an embodiment of an enthalpy-increasing electronic expansion valve control method, which is mainly applied to air source heat pump units with enthalpy-increasing gas / liquid replenishment circuits. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer device such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than that shown here.

[0057] This embodiment provides a method for controlling an enthalpy-increasing electronic expansion valve. Figure 1 This is a flowchart of the enthalpy-increasing electronic expansion valve control method according to an embodiment of the present invention, such as... Figure 1 As shown, the process includes the following steps:

[0058] Step S101: Determine whether the enthalpy-increasing electronic expansion valve needs to be opened based on the operating status of the heat pump unit.

[0059] In this embodiment of the invention, when opening the enthalpy-increasing electronic expansion valve, it is necessary to ensure that the unit is in non-defrost mode, because defrost mode is an unsteady-state operation. Opening the enthalpy-increasing electronic expansion valve in this mode can easily lead to a large amount of liquid return from the unit, causing compressor wear. Simultaneously, it is also necessary to ensure that the unit's exhaust temperature is at a relatively high level. This is because when the exhaust temperature of a heat pump unit is typically high, opening the enthalpy-increasing electronic expansion valve to allow the enthalpy-increasing circuit to replenish gas / liquid can effectively reduce the unit's exhaust temperature, ensuring that the unit's overall safety is not affected by excessively high exhaust temperatures. Figure 2The exhaust temperature usually refers to the temperature at outlet A of the compressor exhaust pipe. However, some compressor manufacturers or specifications may specify a different location B for measuring the exhaust temperature; in such cases, the measurement should be performed according to that specification. The enthalpy-increasing electronic expansion valve typically lowers the exhaust temperature upon opening. If the exhaust temperature is low when the enthalpy-increasing electronic expansion valve is opened, the unit is prone to compressor liquid return.

[0060] Therefore, the condition for determining that the enthalpy-increasing electronic expansion valve needs to be opened in this embodiment of the invention is:

[0061] 1. The main unit is powered on and in non-defrosting mode;

[0062] 2. Current exhaust temperature T of the heat pump unit 排 ≥ Set value T0, and exhaust temperature T 排 The maintenance time exceeds the first preset time, or the exhaust temperature T 排 The temperature rise exceeds the preset temperature threshold within the second preset time period.

[0063] In one embodiment, for example, if the exhaust temperature is maintained for more than 10 seconds, the enthalpy-increasing electronic expansion valve is activated. This can prevent inaccurate detection or fluctuations in the detection value that could lead to misjudgment. Alternatively, if the exhaust temperature rises by 5°C or more within 2 seconds, the enthalpy-increasing electronic expansion valve is activated. This is because if the exhaust temperature rises too quickly, the enthalpy-increasing electronic expansion valve needs to be activated as soon as possible to reduce the exhaust temperature and prevent it from becoming too high.

[0064] Step S102: When the enthalpy-increasing electronic expansion valve needs to be opened, the ambient temperature and outlet water temperature of the heat pump unit are detected, and the initial opening degree of the enthalpy-increasing electronic expansion valve is determined based on the ambient temperature and outlet water temperature.

[0065] Specifically, the enthalpy-increasing electronic expansion valve needs to be opened at a specific initial opening degree. If the initial opening degree is set too large, it can easily lead to a large amount of liquid returning to the compressor's enthalpy-increasing circuit. If the initial opening degree is set too small, the amount of gas / liquid replenishment in the enthalpy-increasing circuit will be insufficient, resulting in ineffective reduction of the exhaust temperature. Different operating conditions require different initial opening degrees for the enthalpy-increasing electronic expansion valve; therefore, it is necessary to determine this based on the actual operating conditions of the main equipment. This embodiment of the invention determines the initial opening degree of the enthalpy-increasing electronic expansion valve based on the ambient temperature and the outlet water temperature. The specific process is as follows:

[0066] A1. Detect the ambient temperature T of the current host device using a thermistor. 环 With outlet water temperature T 出 .

[0067] A2. Based on the relationship between the preset outlet water temperature and the initial opening degree of the enthalpy-increasing electronic expansion valve, according to the detected outlet water temperature T... 出 Calculate the initial opening degree E1 of the theoretically enthalpy-increasing electronic expansion valve.

[0068] Based on the following in the embodiments of the present invention Figure 3 The water temperature curve shown illustrates the relationship between the outlet water temperature and the initial opening degree of the enthalpy-increasing electronic expansion valve, where E... a For the initial opening degree of the high-temperature enthalpy-increasing electronic expansion valve, E b To adjust the initial opening degree of the electronic expansion valve for low water temperature enthalpy increase, T a To initially set a low water temperature for the enthalpy-increasing electronic expansion valve, T b A high water temperature is set for the initial opening of the enthalpy-increasing electronic expansion valve (it should be noted that high and low water temperatures are relative terms). The theoretical initial opening degree of the enthalpy-increasing electronic expansion valve can be obtained from the actual measured outlet water temperature based on the water temperature curve.

[0069] A3. Based on the relationship between the preset ambient temperature and the initial opening correction coefficient for enthalpy increase, according to the detected ambient temperature T 环 Calculate the initial opening correction factor k of the enthalpy-increasing electronic expansion valve.

[0070] Based on the following in the embodiments of the present invention Figure 4 The ambient temperature curve shown represents the relationship between ambient temperature and the correction factor for the initial opening of the enthalpy-increasing electronic expansion valve, k. a k is the initial opening correction factor for the low-ambient-temperature enthalpy-increasing electronic expansion valve. b T is the initial opening correction factor for the low-ambient-temperature enthalpy-increasing electronic expansion valve. c To initially set a low ambient temperature for the enthalpy-increasing electronic expansion valve, T d A high ambient temperature is set for the initial opening of the enthalpy-increasing electronic expansion valve (it should be noted that high and low water temperatures are relative to each other). Based on the ambient temperature curve, the correction coefficient for the initial opening degree of the enthalpy-increasing electronic expansion valve can be obtained by corresponding to the actual measured ambient temperature.

[0071] A4. Based on the theoretical initial opening degree E1 of the enthalpy-increasing electronic expansion valve and the initial opening degree correction coefficient k, the actual initial opening degree E of the enthalpy-increasing electronic expansion valve is obtained. 增 =k*E1, the enthalpy-increasing electronic expansion valve is based on E 增 Start.

[0072] The embodiments of the present invention adjust the initial opening degree of the enthalpy-increasing electronic expansion valve according to different outlet water temperatures and ambient temperatures, which can meet the usage requirements under different application conditions, allowing the unit to quickly reach a stable state and avoiding the problem that the enthalpy-increasing electronic expansion valve cannot respond quickly to sudden load changes, resulting in excessively high exhaust temperature or insufficient exhaust superheat.

[0073] Step S103: After the enthalpy-increasing electronic expansion valve is opened at the initial opening degree and maintained for a preset time until the main equipment is running stably, the opening degree of the enthalpy-increasing electronic expansion valve is adjusted according to the unit's operating status. If a preset special situation is detected during the maintenance period, the adjustment mode is entered in advance to adjust the opening degree of the enthalpy-increasing electronic expansion valve.

[0074] Specifically, after the enthalpy-increasing electronic expansion valve is opened, the main equipment is in an unstable state. If the enthalpy-increasing electronic expansion valve is adjusted by reading the detection parameters of the main equipment at this time, it is easy to cause the adjustment to run out of control. Therefore, the enthalpy-increasing electronic expansion valve should be maintained at its initial opening for a period of time.

[0075] In this embodiment of the invention, the enthalpy-increasing electronic expansion valve is controlled to open and maintain for a preset time (this time is determined based on the period from valve opening to the main equipment reaching a stable state, during which no control of the enthalpy-increasing electronic expansion valve is performed). After the maintenance time, the enthalpy-increasing electronic expansion valve adjustment mode is entered. If a preset special condition is detected during the maintenance period, the adjustment mode is entered early to adjust the opening degree of the enthalpy-increasing electronic expansion valve.

[0076] The preset special time in this embodiment of the invention includes: the current exhaust temperature T of the heat pump unit. 排 ≥T 排气温度保护设定值 -t, where t is a safety margin; and / or exhaust superheat ≤ T 排气过热度过低设定值 In one embodiment, for example:

[0077] a) Exhaust temperature ≥ T 排气温度保护设定值 -10℃. This condition is used to determine if the exhaust temperature is close to the protection value. This invention takes a 10℃ protection margin as an example. If the exhaust temperature is detected 10° in advance, the enthalpy-increasing electronic expansion valve should be adjusted quickly to avoid the exhaust temperature from being too high.

[0078] b) Exhaust superheat ≤ T 排气过热度过低设定值 This condition is used to determine that if the exhaust superheat is insufficient, the enthalpy-increasing electronic expansion valve should be adjusted quickly to prevent excessive liquid return from the compressor.

[0079] In practice, after the enthalpy-increasing electronic expansion valve has been open for a period of time, the main equipment gradually stabilizes. At this point, it is necessary to adjust the opening of the enthalpy-increasing electronic expansion valve according to the unit's status to ensure both a reduction in exhaust temperature and to prevent excessive liquid return from the compressor. The process of adjusting the opening of the enthalpy-increasing electronic expansion valve in regulation mode is as follows:

[0080] B1. Every first preset time period, obtain the inlet temperature T1 and outlet temperature T2 of the economizer's enthalpy-increasing side to calculate the current enthalpy-increasing superheat temperature T. j =T2-T1; In one embodiment, the enthalpy-increasing inlet temperature T1 and outlet temperature T2 of the economizer are obtained every 5 seconds to calculate the enthalpy-increasing superheat temperature.

[0081] Specifically, such as Figure 5The diagram shows the detection locations for the inlet temperature T1 and outlet temperature T2 on the enthalpy-increasing side of the economizer. In this embodiment, the inlet and outlet pipes on the enthalpy-increasing side of the economizer are spaced within 50mm apart. This avoids secondary welding of the heat exchanger weld joints. The closer pipe spacing allows for a more rational pipe layout, reducing stress concentration and uneven stress at welded areas caused by improper pipe arrangement, thereby improving the operational stability and safety of the equipment. The thermistor weld joint is not located below the pipe because the refrigerant is a two-phase gas-liquid system. Different phases may separate under gravity, with the bottom being predominantly liquid, which may lead to inaccurate detection. In practical applications, the thermistor can be located on the side or top of the inlet and outlet pipes to more accurately reflect the overall state of the refrigerant. Figure 5 The example is set on the side.

[0082] B2. Based on the correspondence between the preset outlet water temperature and the adjustment correction coefficient of the enthalpy-increasing electronic expansion valve, the adjustment correction coefficient of the enthalpy-increasing electronic expansion valve is obtained based on the detected outlet water temperature.

[0083] The embodiments of the present invention are based on, for example Figure 6 The curve showing the correspondence between the adjustment correction coefficient of the enthalpy-increasing electronic expansion valve and the outlet water temperature illustrates the relationship between the outlet water temperature and the adjustment correction coefficient of the enthalpy-increasing electronic expansion valve, where k c k is the correction coefficient for the adjustment amount of the electronic expansion valve for low water temperature enthalpy increase. d T is the correction coefficient for the adjustment amount of the high-temperature enthalpy-increasing electronic expansion valve. e To increase enthalpy, the electronic expansion valve adjusts the water temperature at low temperatures. f The adjustment value of the enthalpy-increasing electronic expansion valve is adjusted for high water temperature (it should be noted that high water temperature and low water temperature are relative terms). Generally, the higher the outlet water temperature of the main unit, the higher the exhaust temperature. The enthalpy-increasing electronic expansion valve needs to respond more quickly to avoid excessive exhaust temperature. Therefore, the correction value needs to be increased as the outlet water temperature increases.

[0084] B3. Determine the change in the opening of the electronic expansion valve based on the preset adjustment amount of the enthalpy-increasing electronic expansion valve, the correction coefficient of the adjustment amount of the electronic expansion valve, the current enthalpy-increasing superheat temperature, the target enthalpy-increasing superheat, the exhaust temperature, and the outlet water temperature; specifically, the change in the opening of the electronic expansion valve ΔE is calculated using the following formula:

[0085] △E=E T *k T *(T j -T q )+△P

[0086] Among them, E T To preset the adjustment amount of the electronic expansion valve for increasing enthalpy, k T Correction coefficient for adjustment amount of enthalpy-increasing electronic expansion valve, T qThe target enthalpy superheat is defined as ΔP, where ΔP is the exhaust superheat correction value, and exhaust superheat Tu = exhaust temperature T. 排 -Outlet water temperature T 出 When Tu ≥ the set value Tp, △P is the set value Ty; when Tu < the set value Tp, △P is 0.

[0087] B4. Adjust the opening of the enthalpy-increasing electronic expansion valve based on the change in the opening of the enthalpy-increasing electronic expansion valve.

[0088] Specifically, in this embodiment of the invention, the opening degree of the enthalpy-increasing electronic expansion valve is adjusted according to a second preset time period, which is longer than the first preset time period. The opening degree of the enthalpy-increasing electronic expansion valve is adjusted according to the following formula:

[0089] E 后 =E 前 +△E

[0090] E 后 The adjusted opening of the enthalpy-increasing electronic expansion valve;

[0091] E 前 The opening degree of the electronic expansion valve is increased for the previous time period.

[0092] In this embodiment of the invention, the second preset time period is, for example, 20 seconds, which is greater than the 5-second time period for calculating the enthalpy superheat. This is because it is necessary to allow time for the opening adjustment to be made. The adjustment is based on the latest calculated enthalpy superheat within one adjustment time period, thereby ensuring that there will not be too much parameter fluctuation during the adjustment process.

[0093] In this embodiment of the invention, the change in the opening of the enthalpy-increasing electronic expansion valve is determined by the enthalpy-increasing superheat, the target enthalpy-increasing superheat, the adjustment correction coefficient of the enthalpy-increasing electronic expansion valve, and the exhaust superheat correction value. With the aid of the outlet water temperature and exhaust superheat, the response speed of the enthalpy-increasing electronic expansion valve can be adjusted in a timely manner. In non-steady-state conditions, the enthalpy-increasing electronic expansion valve can be opened quickly, while also avoiding the problem of excessively rapid rise in exhaust temperature.

[0094] This embodiment also provides an enthalpy-increasing electronic expansion valve control device, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0095] This embodiment provides an enthalpy-increasing electronic expansion valve control device, such as... Figure 7 As shown, it includes:

[0096] The valve opening judgment module 701 is used to determine whether the enthalpy-increasing electronic expansion valve needs to be opened based on the operating status of the heat pump unit.

[0097] The valve initial opening degree determination module 702 is used to detect the ambient temperature and outlet water temperature of the heat pump unit main equipment when the enthalpy-increasing electronic expansion valve needs to be opened, and determine the initial opening degree of the enthalpy-increasing electronic expansion valve based on the ambient temperature and outlet water temperature.

[0098] The valve opening adjustment module 703 is used to control the enthalpy-increasing electronic expansion valve to open at the initial opening and maintain it for a preset time until the main equipment is running stably. Then, it enters the adjustment mode according to the unit's operating status to adjust the opening of the enthalpy-increasing electronic expansion valve. If a preset special situation is detected during the maintenance period, it enters the adjustment mode in advance to adjust the opening of the enthalpy-increasing electronic expansion valve.

[0099] In some optional implementations, the valve opening determination module 701 determines that the enthalpy-increasing electronic expansion valve needs to be opened when the operating state of the heat pump unit meets preset conditions. The preset conditions include:

[0100] When the host device is powered on and in non-defrost mode;

[0101] And the current exhaust temperature T of the heat pump unit equipment 排 ≥ Set value T0, and exhaust temperature T 排 The maintenance time exceeds the first preset time, or the exhaust temperature T 排 The temperature rise exceeds the preset temperature threshold within the second preset time period.

[0102] In some alternative implementations, the valve initial opening degree determination module 702 includes:

[0103] The theoretical enthalpy-increasing electronic expansion valve initial opening degree acquisition unit is used to obtain the theoretical enthalpy-increasing electronic expansion valve initial opening degree based on the preset relationship between the outlet water temperature and the enthalpy-increasing electronic expansion valve initial opening degree, according to the detected outlet water temperature T. 出 Calculate the initial opening E1 of the theoretically enthalpy-increasing electronic expansion valve;

[0104] The initial opening correction coefficient acquisition unit is used to obtain the initial opening correction coefficient based on the preset relationship between ambient temperature and enthalpy increase, according to the detected ambient temperature T. 环 Calculate the initial opening correction factor k of the enthalpy-increasing electronic expansion valve;

[0105] The actual initial opening degree acquisition unit is used to obtain the actual initial opening degree E of the enthalpy-increasing electronic expansion valve based on the theoretical initial opening degree E1 and the initial opening degree correction coefficient k. 增 = k*E1.

[0106] In some optional implementations, the valve opening adjustment module 703 has preset special cases, including:

[0107] Current exhaust temperature T of heat pump unit equipment 排 ≥T exhaust temperature protection setting value, and / or exhaust superheat ≤ exhaust superheat too low setting value.

[0108] In some optional implementations, the process by which the valve opening adjustment module 703 adjusts the opening of the enthalpy-increasing electronic expansion valve in the adjustment mode includes:

[0109] The current enthalpy-increasing superheat temperature T is calculated by acquiring the inlet temperature T1 and outlet temperature T2 of the economizer on the enthalpy-increasing side at the first preset time interval. j =T2-T1;

[0110] Based on the correspondence between the preset outlet water temperature and the adjustment correction coefficient of the enthalpy-increasing electronic expansion valve, the adjustment correction coefficient of the enthalpy-increasing electronic expansion valve is obtained based on the detected outlet water temperature.

[0111] The change in the opening degree of the electronic expansion valve is determined based on the preset adjustment amount of the electronic expansion valve, the correction coefficient of the adjustment amount of the electronic expansion valve, the current enthalpy superheat temperature, the target enthalpy superheat, the exhaust temperature, and the outlet water temperature.

[0112] The opening of the enthalpy-increasing electronic expansion valve is adjusted based on the change in the opening of the enthalpy-increasing electronic expansion valve.

[0113] In some alternative implementations, the change in the opening of the enthalpy-increasing electronic expansion valve, ΔE, is calculated using the following formula:

[0114] △E=E T *k T *(T j -T q )+△P

[0115] Among them, E T To preset the adjustment amount of the enthalpy-increasing electronic expansion valve, k serves as the basic number of steps for adjusting the enthalpy-increasing electronic expansion valve. T Correction coefficient for adjustment amount of enthalpy-increasing electronic expansion valve, T q The target enthalpy superheat is defined as ΔP, where ΔP is the exhaust superheat correction value, and exhaust superheat Tu = exhaust temperature T. 排 -Outlet water temperature T 出 When Tu ≥ the set value Tp, △P is the set value Ty; when Tu < the set value Tp, △P is 0. If Tu ≥ Tp, it indicates that the exhaust temperature is relatively high, and the enthalpy-increasing electronic expansion valve needs to respond more quickly to avoid excessive exhaust temperature. Therefore, △P is the set value Ty. Conversely, if Tu < Tp, it indicates that the exhaust temperature is relatively low, and the enthalpy-increasing electronic expansion valve does not need to be changed too much.

[0116] The opening of the enthalpy-increasing electronic expansion valve is adjusted according to the second preset time period, which is longer than the first preset time period. The opening of the enthalpy-increasing electronic expansion valve is adjusted according to the following formula:

[0117] E 后 =E 前 +△E

[0118] E 后 The adjusted opening of the enthalpy-increasing electronic expansion valve;

[0119] E 前 The opening degree of the electronic expansion valve is increased for the previous time period.

[0120] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0121] In this embodiment, the enthalpy-increasing electronic expansion valve control device is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0122] This invention also provides a computer device having the above-described features. Figure 7 The enthalpy-increasing electronic expansion valve control device shown.

[0123] Please see Figure 8 , Figure 8 This is a schematic diagram of the structure of a computer device provided in an optional embodiment of the present invention, such as... Figure 8 As shown, the computer device includes one or more processors 10, memory 20, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions executed within the computer device, including instructions stored in or on memory to display graphical information of a GUI on external input / output devices (such as display devices coupled to the interfaces). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 8 Take a processor 10 as an example.

[0124] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0125] The memory 20 stores instructions executable by at least one processor 10 to cause at least one processor 10 to perform the method shown in the above embodiments.

[0126] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computer device. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0127] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0128] The computer device also includes a communication interface 30 for communicating with other devices or communication networks.

[0129] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as recordable on a storage medium, or implemented as computer code originally stored on a remote storage medium or a non-transitory machine-readable storage medium and subsequently stored on a local storage medium after being downloaded via a network. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium may also include combinations of the above types of memory. It is understood that computers, processors, microprocessor computer devices, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implement the methods shown in the embodiments described above.

[0130] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0131] This invention also provides an air source heat pump unit system, including: an enthalpy-increasing electronic expansion valve and the aforementioned computer equipment. The computer equipment executes the control method described in the above embodiments to adjust the opening degree of the enthalpy-increasing electronic expansion valve, which can enable the enthalpy-increasing electronic expansion valve to respond quickly and at the same time avoid the heat pump unit's exhaust temperature from rising too quickly or the exhaust superheat being insufficient.

[0132] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A method for controlling an enthalpy-increasing electronic expansion valve, characterized in that, include: Determine whether the enthalpy-increasing electronic expansion valve needs to be opened based on the operating status of the heat pump unit; When the enthalpy-increasing electronic expansion valve needs to be opened, the ambient temperature and outlet water temperature of the heat pump unit are detected, and the initial opening degree of the enthalpy-increasing electronic expansion valve is determined based on the ambient temperature and outlet water temperature. After the enthalpy-increasing electronic expansion valve is opened at the initial opening degree and maintained for a preset time until the main equipment is running stably, the opening degree of the enthalpy-increasing electronic expansion valve is adjusted in the regulation mode according to the unit's operating status. If a preset special situation is detected during the maintenance period, the regulation mode is entered in advance to adjust the opening degree of the enthalpy-increasing electronic expansion valve. The preset special situation includes: Current exhaust temperature T of heat pump unit equipment 排 ≥T 排气温度保护设定值 -t, where t is a safety margin; and / or exhaust superheat ≤ T 排气过热度过低设定值 ; The process of adjusting the opening of the enthalpy-increasing electronic expansion valve in the adjustment mode includes: The current enthalpy-increasing superheat temperature T is calculated by acquiring the inlet temperature T1 and outlet temperature T2 of the economizer on the enthalpy-increasing side at the first preset time interval. j = T2 - T1; Based on the correspondence between the preset outlet water temperature and the adjustment correction coefficient of the enthalpy-increasing electronic expansion valve, the adjustment correction coefficient of the enthalpy-increasing electronic expansion valve is obtained based on the detected outlet water temperature. The change in the opening degree of the electronic expansion valve is determined based on the preset adjustment amount of the electronic expansion valve, the correction coefficient of the adjustment amount of the electronic expansion valve, the current enthalpy superheat temperature, the target enthalpy superheat, the exhaust temperature, and the outlet water temperature. Adjust the opening of the enthalpy-increasing electronic expansion valve based on the change in the opening of the enthalpy-increasing electronic expansion valve; The change in the opening of the enthalpy-increasing electronic expansion valve, ΔE, is calculated using the following formula: △E=E T *k T *(T j -T q )+△P Among them, E T To preset the adjustment amount of the electronic expansion valve for increasing enthalpy, k T Correction coefficient for adjustment amount of enthalpy-increasing electronic expansion valve, T q The target enthalpy superheat is defined as follows: ΔP is the exhaust superheat correction value, where exhaust superheat Tu = exhaust temperature T. 排 -Outlet water temperature T 出 When Tu ≥ the set value Tp, △P is the set value Ty; when Tu < the set value Tp, △P is 0. The opening of the enthalpy-increasing electronic expansion valve is adjusted according to a second preset time period, which is longer than the first preset time period. The opening of the enthalpy-increasing electronic expansion valve is adjusted according to the following formula: AND 后 =E 前 +△E E 后 The adjusted opening of the enthalpy-increasing electronic expansion valve; E 前 The opening degree of the electronic expansion valve is increased for the previous time period.

2. The method according to claim 1, characterized in that, When the operating status of the heat pump unit meets preset conditions, it is determined that the enthalpy-increasing electronic expansion valve needs to be opened. The preset conditions include: When the host device is powered on and in non-defrost mode; And the current exhaust temperature T of the heat pump unit equipment 排 ≥ Set value T0, and exhaust temperature T 排 The maintenance time exceeds the first preset time, or the exhaust temperature T 排 The temperature rise exceeds the preset temperature threshold within the second preset time period.

3. The method according to claim 1, characterized in that, Determining the initial opening degree of the enthalpy-increasing electronic expansion valve based on the ambient temperature and the outlet water temperature includes: Based on the relationship between the preset outlet water temperature and the initial opening degree of the enthalpy-increasing electronic expansion valve, and according to the detected outlet water temperature T... 出 Calculate the initial opening E1 of the theoretically enthalpy-increasing electronic expansion valve; Based on the pre-set relationship between ambient temperature and the initial opening correction coefficient for enthalpy increase, according to the detected ambient temperature T 环 Calculate the initial opening correction factor k of the enthalpy-increasing electronic expansion valve; The actual initial opening E of the enthalpy-increasing electronic expansion valve is obtained based on the theoretical initial opening E1 and the initial opening correction coefficient k. 增 =k*E1.

4. A control device for an enthalpy-increasing electronic expansion valve, characterized in that, Based on the method of claim 1, the apparatus comprises: The valve opening judgment module is used to determine whether the enthalpy-increasing electronic expansion valve needs to be opened based on the operating status of the heat pump unit. The valve initial opening degree determination module is used to detect the ambient temperature and outlet water temperature of the heat pump unit main equipment when the enthalpy-increasing electronic expansion valve needs to be opened, and determine the initial opening degree of the enthalpy-increasing electronic expansion valve based on the ambient temperature and outlet water temperature. The valve opening adjustment module is used to control the enthalpy-increasing electronic expansion valve to open at the initial opening and maintain it for a preset time until the main equipment is running stably. Then, it enters the adjustment mode according to the unit's operating status to adjust the opening of the enthalpy-increasing electronic expansion valve. If a preset special situation is detected during the maintenance period, it enters the adjustment mode in advance to adjust the opening of the enthalpy-increasing electronic expansion valve.

5. A computer device, characterized in that, include: A memory and a processor are communicatively connected, the memory stores computer instructions, and the processor executes the computer instructions to perform the enthalpy-increasing electronic expansion valve control method according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a computer to execute the enthalpy-increasing electronic expansion valve control method according to any one of claims 1 to 3.

7. A computer program product, characterized in that, It includes computer instructions for causing a computer to execute the enthalpy-increasing electronic expansion valve control method according to any one of claims 1 to 3.

8. An air source heat pump unit system, characterized in that, include: Enthalpy-increasing electronic expansion valve and the computer device as described in claim 5.

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