A method for controlling the operation of a heat pump water heating device during startup

Abstract

The application discloses a kind of heat pump type hot water supply device protection operation control method in initial stage of starting, and the risk of initial stage of starting operation is judged according to power-on condition, outdoor ambient temperature and water temperature.The application can preliminarily judge whether there is the risk of compression operation reliability in initial stage of unit starting operation by detecting whether the unit meets the continuous power-on condition before starting, can secondarily judge whether there is the risk of compression operation reliability in initial stage of unit starting operation by outdoor ambient temperature, can classify the risk of compression operation reliability in initial stage of unit starting operation by detecting water temperature, and implement different control schemes according to classification, to improve hot water heating efficiency as far as possible while ensuring the reliability of the whole machine.

Description

Technical Field

[0001] This invention relates to a protective operation control method for the initial start-up of a heat pump hot water supply device. Background Technology

[0002] Heat pump hot water supply systems are widely used in the heating industry. However, prolonged shutdown of these systems in low outdoor temperatures can lead to the following problems:

[0003] 1) The low outdoor ambient temperature leads to a low compressor body temperature. When the hot refrigerant discharged from the compressor exhaust chamber comes into contact with the low-temperature compressor casing, the hot refrigerant is easy to condense into liquid refrigerant inside the compressor. The liquid refrigerant remaining at the bottom of the compressor cylinder will cause the compressor lubricating oil to become less lubricating, reducing the reliability of the whole machine operation.

[0004] 2) Because compressor lubricating oil and refrigerant have good miscibility, and the miscibility between the two increases as the temperature decreases, too much refrigerant dissolved in the lubricating oil will cause the lubricating oil to lose its lubricating properties and reduce the reliability of the whole machine operation.

[0005] The above two situations become more pronounced after the compressor has been shut down for a long time in a low-temperature environment. Therefore, how to reasonably control the operating status of the compressor at the initial stage of startup becomes a key control item in the initial stage of startup control of heat pump hot water supply devices. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a protective operation control method for the initial startup of a heat pump hot water supply device, effectively solving the problems mentioned in the background art.

[0007] The technical solution adopted in this invention is:

[0008] A protective operation control method for a heat pump hot water supply device during initial startup, comprising the following steps:

[0009] Step S1: Start the program, then proceed to step S2;

[0010] Step S2: Determine whether the unit has received a power-on signal. If a power-on signal is received, proceed to step S3; otherwise, proceed to step S46.

[0011] Step S3: Obtain power-on duration t sd Obtain the outdoor ambient temperature T o Set the time statistics parameter t=0, and then proceed to step S4;

[0012] Step S4: Determine whether the unit meets the continuous power-on conditions. If the continuous power-on conditions are met, proceed to step S17; otherwise, proceed to step S5.

[0013] Step S5: Set the outdoor ambient temperature T o Compare with the preset judgment threshold a, if T o If the value is ≥a, proceed to step S17; otherwise, proceed to step S6.

[0014] Step S6: Set the outdoor ambient temperature T o Compare with the preset judgment threshold b, if T o If b ≤ b, proceed to step S7; otherwise, proceed to step S10.

[0015] Step S7: Start the compressor preheating function, count t, and then proceed to step S8;

[0016] Step S8: Compare the statistical time t with the preset preheating time threshold t yr Compare, if t≥t yr Then proceed to step S9; otherwise proceed to step S7.

[0017] Step S9: Stop the compressor preheating function, set t=0, and then proceed to step S10;

[0018] Step S10: Turn on the circulating water pump, and set the pump speed to R. s Press high speed R H Run the process, record the time t, and then proceed to step S11;

[0019] Step S11: Compare the statistical time t with the preset time judgment threshold c. If t≥c, proceed to step S12; otherwise, proceed to step S10.

[0020] Step S12: Let t=0, and obtain the hot water temperature T. rs Then proceed to step S13;

[0021] Step S13: For T rs T o The determination is made based on whether the identified state point is in region ①. If T rs T o If the determined state point is in region ①, proceed to step S14; otherwise, proceed to step S35.

[0022] Step S14: Set the hot water temperature T rs The system determines whether the water temperature exceeds a preset threshold d. If T... rs If the value is ≥d, proceed to step S15; otherwise, proceed to step S19.

[0023] Step S15: Obtain the target operating frequency F of the compressor tar Then proceed to step S16;

[0024] Step S16: Let t=0, and set the compressor operating frequency according to F. tar Run the process, and then proceed to step S17;

[0025] Step S17: The unit operates under normal conditions, and then proceeds to step S18;

[0026] Step S18: Determine whether the unit has received a shutdown signal. If the unit has received a shutdown signal, proceed to step S46; otherwise, proceed to step S17.

[0027] Step S19: Set the hot water temperature T rs The system determines whether the water temperature exceeds a preset threshold value e. If T... rs If the result is ≥e, proceed to step S20; otherwise, proceed to step S26.

[0028] Step S20: Obtain the target operating frequency F of the compressor tar Circulating water pump speed R s Press high speed R H Run the process, and then proceed to step S21;

[0029] Step S21: Calculate time t, operate according to control mode 1, and then proceed to step S22;

[0030] Step S22: Compressor operating frequency according to F tar Press +F1 to start the process, then proceed to step S23;

[0031] Step S23: Obtain the compressor discharge temperature Td, record the time t, and then proceed to step S24;

[0032] Step S24: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td1 of control mode 1. If Td≥Td1, proceed to step S16; otherwise, proceed to step S25.

[0033] Step S25: Compare the statistical time t with the time control threshold t1 of control mode 1. If t≥t1, proceed to step S16; otherwise, proceed to step S23.

[0034] Step S26: Set the hot water temperature T rs The system determines whether the water temperature exceeds a preset threshold f. If T... rs If f ≥ f, proceed to step S27; otherwise, proceed to step S35.

[0035] Step S27: Obtain the target operating frequency F of the compressor tar Circulating water pump speed R s According to the medium speed R M Run the process, and then proceed to step S28;

[0036] Step S28: Calculate time t, operate in control mode 2, and then proceed to step S29;

[0037] Step S29: Compressor operating frequency according to F tar Press +F2 to start the process, and then proceed to step S30;

[0038] Step S30: Obtain the compressor discharge temperature Td, record the time t, and then proceed to step S31;

[0039] Step S31: Compare the statistical time t with the time control threshold t2 of control mode 2. If t≥t2, proceed to step S16; otherwise, proceed to step S32.

[0040] Step S32: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td2 of control mode 2. If Td≥Td2, proceed to step S16; otherwise, proceed to step S33.

[0041] Step S33: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td1 of control mode 1. If Td≥Td1, proceed to step S34; otherwise, proceed to step S30.

[0042] Step S34: Compressor operating frequency according to F tar Press +F1 to start the process, then proceed to step S30;

[0043] Step S35: Obtain the target operating frequency F of the compressor tar The compressor operating frequency is according to F tar The operation begins, the circulating water pump stops running, and then proceeds to step S36;

[0044] Step S36: Obtain the compressor discharge temperature Td, record the time t, and then proceed to step S37;

[0045] Step S37: Set the hot water temperature T rs The system determines whether the water temperature exceeds a preset threshold g. If T... rs If ≥g, proceed to step S38; otherwise, proceed to step S36.

[0046] Step S38: Set t=0, then proceed to step S39;

[0047] Step S39: Calculate the time t and the circulating water pump speed R. s Press low speed R L Start the operation, operate in control mode 3, and then proceed to step S40;

[0048] Step S40: Compressor operating frequency according to F tarPress +F3 to start the process, then proceed to step S41;

[0049] Step S41: Obtain the compressor discharge temperature Td, record the time t, and then proceed to step S42;

[0050] Step S42: Compare the statistical time t with the time control threshold t3 of control mode 3. If t≥t3, proceed to step S16; otherwise, proceed to step S43.

[0051] Step S43: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td3 of control mode 3. If Td≥Td3, proceed to step S16; otherwise, proceed to step S44.

[0052] Step S44: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td2 of control mode 2. If Td≥Td2, proceed to step S45; otherwise, proceed to step S41.

[0053] Step S45: Compressor operating frequency according to F tar Press +F2 to start the process, and then proceed to step S41;

[0054] Step S46: End the program.

[0055] Preferably, the power-on condition in step S4 is to satisfy any one of the following: a, T o ≥5℃ and t sd ≥0h; b, 0≤T o <5℃ and t sd ≥0.5h; c, -5≤T o <0℃ and t sd ≥1h; d, -10≤T o <-5℃ and t sd ≥1.5h; e, T o <-10℃ and t sd ≥2h.

[0056] Preferably, when judging region ① in step S13, according to Figure 4 Make a judgment.

[0057] This invention can initially determine whether there is a risk to the reliability of compression operation in the early stage of unit startup by detecting whether the unit meets the continuous power-on conditions before startup. It can also make a secondary judgment on the risk to the reliability of compression operation in the early stage of unit startup by detecting the outdoor ambient temperature. Furthermore, it can classify the risk to the reliability of compression operation in the early stage of unit startup by detecting the water temperature, and implement different control schemes according to the classification, so as to maximize the hot water heating efficiency while ensuring the overall reliability of the unit. Attached Figure Description

[0058] Figure 1 This is a structural diagram of the heat pump hot water supply device involved in the present invention;

[0059] Figure 2 Here is a structural diagram of the control mechanism;

[0060] Figure 3 This is a control principle diagram of the present invention;

[0061] Figure 4 The present invention relates to a heat pump type hot water supply device T. rs T o A schematic diagram showing the region where the determined state point is located. Detailed Implementation

[0062] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0063] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0064] Furthermore, in the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0068] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0069] Figure 1 The illustration shows a heat pump hot water supply device according to the present invention, including a heat pump module 10, a heat exchange module 20 and a control mechanism 30. The heat pump module 10 includes a compressor 11, an exhaust temperature sensor 12, a four-way reversing valve 13, an air-refrigerant heat exchanger 14, a fan 15 and a throttling mechanism 16. The compressor 11 of the present invention is a variable speed compressor, which can compress low-temperature and low-pressure refrigerant into high-temperature and high-pressure refrigerant, and also provides power for the refrigerant to flow in the refrigeration pipe.

[0070] The exhaust temperature sensor 12 involved in this invention can detect the temperature of the high-temperature refrigerant discharged by the compressor. The four-way reversing valve 13 involved in this invention can change the flow direction of the refrigerant inside the four-way reversing valve by switching the direction of the four-way reversing valve. The four-way reversing valve 13 has two operating states: heating and cooling. The air-refrigerant heat exchanger 14 involved in this invention can exchange heat between the refrigerant flowing through it and the outdoor air flowing through it. The fan 15 involved in this invention can enhance the air flow on the surface of the air-refrigerant heat exchanger 14 and enhance the heat exchange effect on the air side of the air-refrigerant heat exchanger 14. The throttling mechanism 16 involved in this invention can be a flow-adjustable electronic expansion valve. The heat exchange module 20 involved in this invention is composed of an outlet water temperature sensor 21, a refrigerant-water heat exchanger 22, a circulating water pump 23, an inlet water pipe 24, and an outlet water pipe 25. The water temperature sensor 21 involved in this invention can detect the water temperature. The refrigerant-water heat exchanger 22 of this invention is capable of exchanging heat between the refrigerant flowing through it and the water flowing through it. The refrigerant-water heat exchanger 22 has four ports: a, b, c, and d. Ports a and b are refrigerant ports; during heating operation, refrigerant flows into the refrigerant-water heat exchanger 22 from port a and flows out from port b. Ports c and d are circulating water ports; circulating water flows into the refrigerant-water heat exchanger 22 from port c and flows out from port d. 2. The circulating water pump 23 involved in this invention can provide circulating power for the water inside the water system. The inlet pipe 24 involved in this invention can provide circulating water to the heat exchange module 20. The outlet pipe 25 involved in this invention can provide circulating water to the outside of the heat exchange module 20. The control mechanism 30 involved in this invention can collect the operating status of each component in the heat pump module 10 and the heat exchange module 20 and control the operating status of each component in the heat pump module 10 and the heat exchange module 20.

[0071] Figure 2 The control mechanism 30 of the present invention is illustrated and consists of an operation information acquisition module 31, a power-on status judgment module 32, an operation status acquisition module 33, an operation status judgment module 34, an operation status control module 35, and an operation information storage module 36.

[0072] The operation information acquisition module 31 can receive the operation parameter information set by the user.

[0073] The power-on status judgment module 32 can detect whether the unit is in a powered-on state for a period of time before startup.

[0074] The operation status acquisition module 33 is capable of acquiring the operation status information of the heat pump hot water supply device.

[0075] The operation status judgment module 34 is capable of judging the current operation status of the heat pump hot water supply device.

[0076] The operation status control module 35 is capable of controlling the operation status of the heat pump hot water supply device.

[0077] The operation information storage module 36 is capable of storing operation parameter information of the heat pump hot water supply device during operation.

[0078] like Figure 3 As shown, this invention discloses a protective operation control method for the initial startup of a heat pump hot water supply device, comprising the following steps:

[0079] Step S1: Start the program, then proceed to step S2;

[0080] Step S2: Determine whether the unit has received a power-on signal. If a power-on signal is received, proceed to step S3; otherwise, proceed to step S46.

[0081] Step S3: Obtain power-on duration t sd Obtain the outdoor ambient temperature T o Set the time statistics parameter t=0, and then proceed to step S4;

[0082] Step S4: Determine whether the unit meets the continuous power-on conditions. If the continuous power-on conditions are met, proceed to step S17; otherwise, proceed to step S5.

[0083] Step S5: Set the outdoor ambient temperature T o Compare with the preset judgment threshold a, if T o If the value is ≥a, proceed to step S17; otherwise, proceed to step S6.

[0084] Step S6: Set the outdoor ambient temperature T o Compare with the preset judgment threshold b, if T o If b ≤ b, proceed to step S7; otherwise, proceed to step S10.

[0085] Step S7: Start the compressor preheating function, count t, and then proceed to step S8;

[0086] Step S8: Compare the statistical time t with the preset preheating time threshold t yr Compare, if t≥t yr Then proceed to step S9; otherwise proceed to step S7.

[0087] Step S9: Stop the compressor preheating function, set t=0, and then proceed to step S10;

[0088] Step S10: Turn on the circulating water pump, and set the pump speed to R. sPress high speed R H Run the process, record the time t, and then proceed to step S11;

[0089] Step S11: Compare the statistical time t with the preset time judgment threshold c. If t≥c, proceed to step S12; otherwise, proceed to step S10.

[0090] Step S12: Let t=0, and obtain the hot water temperature T. rs Then proceed to step S13;

[0091] Step S13: For T rs T o The determination is made based on whether the identified state point is in region ①. If T rs T o If the determined state point is in region ①, proceed to step S14; otherwise, proceed to step S35.

[0092] Step S14: Set the hot water temperature T rs The system determines whether the water temperature exceeds a preset threshold d. If T... rs If the value is ≥d, proceed to step S15; otherwise, proceed to step S19.

[0093] Step S15: Obtain the target operating frequency F of the compressor tar Then proceed to step S16;

[0094] Step S16: Let t=0, and set the compressor operating frequency according to F. tar Run the process, and then proceed to step S17;

[0095] Step S17: The unit operates under normal conditions, and then proceeds to step S18;

[0096] Step S18: Determine whether the unit has received a shutdown signal. If the unit has received a shutdown signal, proceed to step S46; otherwise, proceed to step S17.

[0097] Step S19: Set the hot water temperature T rs The system determines whether the water temperature exceeds a preset threshold value e. If T... rs If the result is ≥e, proceed to step S20; otherwise, proceed to step S26.

[0098] Step S20: Obtain the target operating frequency F of the compressor tar Circulating water pump speed R s Press high speed R H Run the process, and then proceed to step S21;

[0099] Step S21: Calculate time t, operate according to control mode 1, and then proceed to step S22;

[0100] Step S22: Compressor operating frequency according to F tar Press +F1 to start the process, then proceed to step S23;

[0101] Step S23: Obtain the compressor discharge temperature Td, record the time t, and then proceed to step S24;

[0102] Step S24: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td1 of control mode 1. If Td≥Td1, proceed to step S16; otherwise, proceed to step S25.

[0103] Step S25: Compare the statistical time t with the time control threshold t1 of control mode 1. If t≥t1, proceed to step S16; otherwise, proceed to step S23.

[0104] Step S26: Set the hot water temperature T rs The system determines whether the water temperature exceeds a preset threshold f. If T... rs If f ≥ f, proceed to step S27; otherwise, proceed to step S35.

[0105] Step S27: Obtain the target operating frequency F of the compressor tar Circulating water pump speed R s According to the medium speed R M Run the process, and then proceed to step S28;

[0106] Step S28: Calculate time t, operate in control mode 2, and then proceed to step S29;

[0107] Step S29: Compressor operating frequency according to F tar Press +F2 to start the process, and then proceed to step S30;

[0108] Step S30: Obtain the compressor discharge temperature Td, record the time t, and then proceed to step S31;

[0109] Step S31: Compare the statistical time t with the time control threshold t2 of control mode 2. If t≥t2, proceed to step S16; otherwise, proceed to step S32.

[0110] Step S32: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td2 of control mode 2. If Td≥Td2, proceed to step S16; otherwise, proceed to step S33.

[0111] Step S33: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td1 of control mode 1. If Td≥Td1, proceed to step S34; otherwise, proceed to step S30.

[0112] Step S34: Compressor operating frequency according to F tar Press +F1 to start the process, then proceed to step S30;

[0113] Step S35: Obtain the target operating frequency F of the compressor tar The compressor operating frequency is according to F tar The operation begins, the circulating water pump stops running, and then proceeds to step S36;

[0114] Step S36: Obtain the compressor discharge temperature Td, record the time t, and then proceed to step S37;

[0115] Step S37: Set the hot water temperature T rs The system determines whether the water temperature exceeds a preset threshold g. If T... rs If ≥g, proceed to step S38; otherwise, proceed to step S36.

[0116] Step S38: Set t=0, then proceed to step S39;

[0117] Step S39: Calculate the time t and the circulating water pump speed R. s Press low speed R L Start the operation, operate in control mode 3, and then proceed to step S40;

[0118] Step S40: Compressor operating frequency according to F tar Press +F3 to start the process, then proceed to step S41;

[0119] Step S41: Obtain the compressor discharge temperature Td, record the time t, and then proceed to step S42;

[0120] Step S42: Compare the statistical time t with the time control threshold t3 of control mode 3. If t≥t3, proceed to step S16; otherwise, proceed to step S43.

[0121] Step S43: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td3 of control mode 3. If Td≥Td3, proceed to step S16; otherwise, proceed to step S44.

[0122] Step S44: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td2 of control mode 2. If Td≥Td2, proceed to step S45; otherwise, proceed to step S41.

[0123] Step S45: Compressor operating frequency according to F tar Press +F2 to start the process, and then proceed to step S41;

[0124] Step S46: End the program.

[0125] The power-on condition in step S4 is to satisfy any one of the following: a, T o ≥5℃ and t sd ≥0h; b, 0≤T o <5℃ and t sd ≥0.5h; c, -5≤T o <0℃ and t sd ≥1h; d, -10≤T o <-5℃ and t sd ≥1.5h; e, T o <-10℃ and t sd ≥2h.

[0126] In step S13, when judging region ①, according to Figure 4 Based on the judgment, the heat pump type hot water supply device T involved in this invention... rs T o The determined state point is located in an area divided into two regions by the broken line ABCD: region ① and region ②. Region ① is the area encompassed by the upper right side of broken line ABCD (including broken line ABCD), and region ② is the area encompassed by the lower left side of broken line ABCD (excluding broken line ABCD). Broken line AB is located at point T. rs On the straight line where the temperature is 30℃, point B is at point T. rs =30℃ and T o The intersection point of -10℃, point C is T rs =20℃ and T o The intersection point is -5℃, and the broken line CD is at T. o On a straight line at -5℃.

[0127] The symbols involved in this invention are explained as follows:

[0128] T o Outdoor ambient temperature, °C;

[0129] T rs Hot water temperature, °C;

[0130] Td: Compressor discharge temperature, °C;

[0131] R s The target speed of the circulating water pump: The circulating water pump of this invention can be set to 3 speeds (high speed R...). H Mid-speed R M low speed R L To explain,

[0132] F tar : Target frequency of the compressor under normal operating conditions, in Hz;

[0133] F: Actual operating frequency of the compressor, in Hz;

[0134] F1: Control mode 1 compressor operating frequency correction parameter, preset value, such as F1 preset to 5Hz;

[0135] F2: Control mode 2 compressor operating frequency correction parameter, preset value, such as F2 preset to 10Hz;

[0136] F3: Control mode 3 compressor operating frequency correction parameter, preset value, such as F3 preset to 15Hz;

[0137] t: Time statistics parameter, min;

[0138] t sd : Continuous power-on time, h;

[0139] t yr Compressor preheating time, preset value, such as t yr The preset time is 5 minutes.

[0140] t1: The time control threshold for the first control mode, a preset value, such as t1 being preset to 10 minutes;

[0141] t2: The time control threshold for the second control mode, a preset value, such as t2 being preset to 15 minutes;

[0142] t3: The time control threshold for the third control mode, a preset value, such as t3 preset to 20min;

[0143] Td1: The exhaust temperature judgment threshold for the first control mode, a preset value, such as Td1 preset to 40℃;

[0144] Td2: The exhaust temperature judgment threshold for the second control mode, a preset value, such as Td2 preset to 45℃;

[0145] Td3: The exhaust temperature judgment threshold for the third control mode, a preset value, such as Td3 preset to 50℃;

[0146] a: Preset outdoor ambient temperature threshold, such as 5℃;

[0147] b: Preset outdoor ambient temperature judgment threshold, such as b is preset to -5℃;

[0148] c: Preset time threshold, such as c is preset to 1 minute;

[0149] d: Preset water temperature judgment threshold, such as d preset to 30℃;

[0150] e: Preset water temperature judgment threshold, e is preset to 20℃;

[0151] f: Preset water temperature judgment threshold, such as f is preset to 10℃;

[0152] g: Preset exhaust temperature judgment threshold, such as g is preset to 30℃.

[0153] The heat pump hot water supply device involved in this invention can preliminarily determine whether there is a risk to the reliability of the compressor operation in the early stage of the unit's startup by detecting whether the unit meets the continuous power-on conditions before startup.

[0154] The heat pump hot water supply device involved in this invention can determine whether there is a risk to the reliability of the compressor operation during the initial stage of unit startup by using the outdoor ambient temperature. When the outdoor ambient temperature is high, it is determined that there is no risk to the reliability of the whole machine operation. When the outdoor ambient temperature is low, it is determined that there is a high risk to the reliability of the whole machine operation, and the compressor cannot be started directly. The compressor should be started after it has completed preheating.

[0155] The heat pump hot water supply device involved in this invention can classify the potential reliability risks of the unit during the initial startup by detecting the water temperature, and implement different control schemes according to the classification, so as to maximize the hot water heating efficiency while ensuring the overall reliability of the unit.

[0156] The heat pump hot water supply device involved in this invention can statistically analyze whether the unit is powered and the duration of power supply. It can determine whether there is a risk in the initial stage of unit startup based on the duration of power supply and the outdoor ambient temperature. The lower the outdoor ambient temperature, the longer the continuous power supply time required for the unit to meet the continuous power supply requirements.

[0157] The heat pump hot water supply device involved in this invention is also judged to be free of risk in the initial stage of startup if the outdoor ambient temperature is higher than a certain preset judgment threshold and the unit does not meet the continuous power-on requirements; if the outdoor ambient temperature is lower than a certain preset judgment threshold, the compressor preheating function needs to be activated, and the next step is performed after the preheating is completed.

[0158] The heat pump hot water supply device involved in this invention can divide the state of the unit into regions (region ① or region ②) according to the outdoor ambient temperature and the hot water temperature when the outdoor ambient temperature is lower than a certain preset judgment threshold, and preliminarily judge whether there is a risk in the initial stage of unit startup.

[0159] When the unit is located in Zone ②, the circulating water pump stops operating to reduce heat exchange on the refrigerant side and quickly increase the refrigerant temperature.

[0160] When the unit is located in area ①, the whole unit will enter control mode 1, control mode 2 or control mode 3 to operate according to the actual hot water temperature, and the circulating water pump will operate at high, medium or low speed.

[0161] When the heat pump hot water supply device involved in this invention operates in control mode 1, control mode 2 or control mode 3, the actual frequency of its compressor is increased by a certain value based on the base frequency.

[0162] The heat pump hot water supply device involved in this invention, when operating in control mode 1, control mode 2 or control mode 3, has a compressor that gradually increases in value based on the base frequency.

[0163] The heat pump hot water supply device involved in this invention has a maximum operating time that gradually increases when operating in control mode 1, control mode 2 or control mode 3.

[0164] The heat pump hot water supply device involved in this invention, when operating in control mode 1, control mode 2 or control mode 3, if the compressor exhaust temperature is higher than the exhaust exit temperature of the previous control mode, reduces the compressor frequency and increases the value.

[0165] The heat pump hot water supply device involved in this invention exits protection operation when the compressor exhaust temperature is higher than a preset threshold or the protection operation time is longer than a preset threshold during the initial start-up protection operation.

[0166] Finally, it should be noted that the above examples are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this invention should be considered within the scope of protection of this invention.

Claims

1. A protective operation control method for the initial start-up of a heat pump hot water supply device, characterized in that, Includes the following steps: Step S1: Start the program, then proceed to step S2; Step S2: Determine whether the unit has received a power-on signal. If a power-on signal is received, proceed to step S3; otherwise, proceed to step S46. Step S3: Obtain power-on duration t sd Obtain the outdoor ambient temperature T o Set the time statistics parameter t=0, and then proceed to step S4; Step S4: Determine whether the unit meets the continuous power-on conditions. If the continuous power-on conditions are met, proceed to step S17; otherwise, proceed to step S5. Step S5: Set the outdoor ambient temperature T o Compare with the preset judgment threshold a, if T o If the value is ≥a, proceed to step S17; otherwise, proceed to step S6. Step S6: Set the outdoor ambient temperature T o Compare with the preset judgment threshold b, if T o If b ≤ b, proceed to step S7; otherwise, proceed to step S10. Step S7: Start the compressor preheating function, count t, and then proceed to step S8; Step S8: Compare the statistical time t with the preset preheating time threshold t yr Compare, if t≥t yr Then proceed to step S9; otherwise proceed to step S7. Step S9: Stop the compressor preheating function, set t=0, and then proceed to step S10; Step S10: Turn on the circulating water pump, and set the pump speed to R. s Press high speed R H Run the process, record the time t, and then proceed to step S11; Step S11: Compare the statistical time t with the preset time judgment threshold c. If t≥c, proceed to step S12; otherwise, proceed to step S10. Step S12: Let t=0, and obtain the hot water temperature T. rs Then proceed to step S13; Step S13: For T rs T o The determination is made based on whether the identified state point is in region ①. If T rs T o If the determined state point is in region ①, proceed to step S14; otherwise, proceed to step S35. Step S14: Set the hot water temperature T rs The system determines whether the water temperature exceeds a preset threshold d. If T... rs If the value is ≥d, proceed to step S15; otherwise, proceed to step S19. Step S15: Obtain the target operating frequency F of the compressor tar Then proceed to step S16; Step S16: Let t=0, and set the compressor operating frequency according to F. tar Run the process, and then proceed to step S17; Step S17: The unit operates under normal conditions, and then proceeds to step S18; Step S18: Determine whether the unit has received a shutdown signal. If the unit has received a shutdown signal, proceed to step S46; otherwise, proceed to step S17. Step S19: Set the hot water temperature T rs The system determines whether the water temperature exceeds a preset threshold value e. If T... rs If the result is ≥e, proceed to step S20; otherwise, proceed to step S26. Step S20: Obtain the target operating frequency F of the compressor tar Circulating water pump speed R s Press high speed R H Run the process, and then proceed to step S21; Step S21: Calculate time t, operate according to control mode 1, and then proceed to step S22; Step S22: Compressor operating frequency according to F tar Press +F1 to start the process, then proceed to step S23; Step S23: Obtain the compressor discharge temperature Td, record the time t, and then proceed to step S24; Step S24: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td1 of control mode 1. If Td≥Td1, proceed to step S16; otherwise, proceed to step S25. Step S25: Compare the statistical time t with the time control threshold t1 of control mode 1. If t≥t1, proceed to step S16; otherwise, proceed to step S23. Step S26: Set the hot water temperature T rs The system determines whether the water temperature exceeds a preset threshold f. If T... rs If f ≥ f, proceed to step S27; otherwise, proceed to step S35. Step S27: Obtain the target operating frequency F of the compressor tar Circulating water pump speed R s According to the medium speed R M Run the process, and then proceed to step S28; Step S28: Calculate time t, operate in control mode 2, and then proceed to step S29; Step S29: Compressor operating frequency according to F tar Press +F2 to start the process, and then proceed to step S30; Step S30: Obtain the compressor discharge temperature Td, record the time t, and then proceed to step S31; Step S31: Compare the statistical time t with the time control threshold t2 of control mode 2. If t≥t2, proceed to step S16; otherwise, proceed to step S32. Step S32: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td2 of control mode 2. If Td≥Td2, proceed to step S16; otherwise, proceed to step S33. Step S33: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td1 of control mode 1. If Td≥Td1, proceed to step S34; otherwise, proceed to step S30. Step S34: Compressor operating frequency according to F tar Press +F1 to start the process, then proceed to step S30; Step S35: Obtain the target operating frequency F of the compressor tar The compressor operating frequency is according to F tar The operation begins, the circulating water pump stops running, and then proceeds to step S36; Step S36: Obtain the compressor discharge temperature Td, record the time t, and then proceed to step S37; Step S37: Set the hot water temperature T rs The system determines whether the water temperature exceeds a preset threshold g. If T... rs If ≥g, proceed to step S38; otherwise, proceed to step S36. Step S38: Set t=0, then proceed to step S39; Step S39: Calculate the time t and the circulating water pump speed R. s Press low speed R L Start the operation, operate in control mode 3, and then proceed to step S40; Step S40: Compressor operating frequency according to F tar Press +F3 to start the process, then proceed to step S41; Step S41: Obtain the compressor discharge temperature Td, record the time t, and then proceed to step S42; Step S42: Compare the statistical time t with the time control threshold t3 of control mode 3. If t≥t3, proceed to step S16; otherwise, proceed to step S43. Step S43: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td3 of control mode 3. If Td≥Td3, proceed to step S16; otherwise, proceed to step S44. Step S44: Compare the obtained compressor exhaust temperature Td with the exhaust temperature judgment threshold Td2 of control mode 2. If Td≥Td2, proceed to step S45; otherwise, proceed to step S41. Step S45: Compressor operating frequency according to F tar Press +F2 to start the process, and then proceed to step S41; Step S46: End the program.

2. The protective operation control method for the initial start-up of a heat pump hot water supply device according to claim 1, characterized in that, The power-on condition in step S4 is to satisfy any one of the following: a, T o ≥5℃ and t sd ≥0h; b, 0≤T o <5℃ and t sd ≥0.5h; c, -5≤T o <0℃ and t sd ≥1h; d, -10≤T o <-5℃ and t sd ≥1.5h; e, T o <-10℃ and t sd ≥2h.

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