A control method and system for an air source heat pump unit

Abstract

The present application relates to a kind of control method and system for air source heat pump unit, wherein, control method includes: S1, obtains real-time room temperature parameter, determines the working mode of air source heat pump unit according to room temperature parameter;S2, based on room temperature parameter and the working mode of air source heat pump unit, according to the preset air source heat pump unit operation rule, the operating state of air source heat pump unit is controlled, and according to the preset fan operation rule, the working state of fan is controlled.The present application realizes the acquisition of the working mode of air source heat pump unit by obtaining room temperature parameter, and then realizes the control of the operating state of air source heat pump unit.Compared with the prior art, users can directly control the working operating state of unit based on the temperature in the room, reduce the noise of fan after temperature control balance, and eliminate a small amount of water system cavitation, mechanical false alarm.

Description

Technical Field

[0001] This invention relates to the field of air source heat pump water heater control technology, and in particular to a control method and system for air source heat pump units. Background Technology

[0002] Currently, air source heat pump water heaters are increasingly favored by users for their comfort, energy efficiency, and environmental friendliness. The principle of air source heat pump water heaters is basically the same as that of conventional air source heat pumps, both utilizing the reverse Carnot cycle to transfer energy by absorbing heat from the air. However, unlike conventional air source heat pumps, air source heat pump water heaters use a water heat exchanger to first transfer heat to the water circuit, and then a circulating water pump delivers the heat to the user's end to achieve heating or cooling. Therefore, current air source heat pump water heaters cannot directly control the actual indoor temperature; instead, they indirectly control the indoor temperature by controlling the inlet and outlet water temperatures. This makes it impossible for users to directly adjust the temperature according to their needs, resulting in a cumbersome process for adjusting the actual indoor temperature. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a control method and system for air source heat pump units, which solves the technical problem that existing air source heat pump water heaters cannot directly control the actual indoor temperature, but indirectly control the indoor temperature by controlling the temperature of the inlet and outlet water, making it impossible for users to directly adjust according to their indoor temperature needs, thus resulting in a cumbersome process for adjusting the actual indoor temperature.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0007] In a first aspect, the present invention provides a control method for an air source heat pump unit, the air source heat pump unit comprising a compressor, a water pump, a fan, and a water-heat exchanger, the control method comprising:

[0008] S1. Obtain real-time room temperature parameters and determine the operating mode of the air source heat pump unit based on the room temperature parameters;

[0009] The room temperature parameters include: preset room temperature and actual room temperature; the operating modes of the air source heat pump unit include: cooling mode and heating mode.

[0010] S2. Based on room temperature parameters and the working mode of the air source heat pump unit, control the operating status of the air source heat pump unit according to the preset air source heat pump unit operating rules, and control the working status of the fan according to the preset fan operating rules.

[0011] The operating rules of the air source heat pump unit include: cooling operation rules and heating operation rules; the working status of the fan includes: shutdown status, high fan speed status and low fan speed status.

[0012] Obtain the inlet and outlet water temperatures of the water heat exchanger;

[0013] The cooling operation rules include: when the frequency control mode of the air source heat pump unit is set to constant temperature frequency control, if the following conditions are met: actual room temperature ≤ P 27 , or satisfy: T 进水 ≤P 04 -P 01 Then the air source heat pump unit will perform constant temperature control; if the following condition is met: actual room temperature ≤ P 27 When the temperature is -2℃, the air source heat pump unit stops cooling; otherwise, it maintains constant temperature control.

[0014] The constant temperature control methods involved in the refrigeration operation rules include:

[0015] 1) When the following condition is met: actual room temperature ≤ P 27 Execute step W;

[0016] 2) When T is satisfied: 进水 ≤P 04 -P 01 The compressor frequency remains constant, when T 进水 Located in (P) 04 -P 01 When T is within ±0.3℃, maintain the original frequency; when T 进水 < (P 04 -P 01 At -0.3℃, if the temperature does not rise, the frequency decreases by 2Hz every 30 seconds; when T 进水 > (P 04 -P 01 If the temperature does not decrease when the room temperature is +0.3℃, then increase the frequency by 2Hz every 30 seconds until the room temperature is ≤P27, then execute step W.

[0017] The step W includes: the fan running at low speed, starting from the compressor frequency of 46Hz, when the room temperature is within the range P. 27 At ±0.3℃, the frequency remained constant; when room temperature < P 27 At -0.3℃, if the temperature does not rise, the frequency decreases by 2Hz every 30 seconds; when room temperature > P 27 If the temperature does not decrease at +0.3℃, the frequency increases by 2Hz every 30 seconds; when the room temperature is ≥P27 At +1℃, the fan runs at high speed, restoring the set operating frequency;

[0018] P 27 The preset room temperature; T 进水 P represents the inlet water temperature. 04 Preset water temperature; P 01 This refers to the hysteresis temperature.

[0019] Optionally, in step S1, obtaining room temperature parameters and determining the operating mode of the air source heat pump unit based on the room temperature parameters includes:

[0020] When the actual room temperature is higher than the preset room temperature, the air source heat pump unit starts the cooling mode; when the actual room temperature is lower than the preset room temperature, the air source heat pump unit starts the heating mode.

[0021] Optionally, S2 includes,

[0022] When controlling the operating status of an air source heat pump water heater, the operating status of the fan is controlled synchronously.

[0023] Optionally, the step S2, which controls the operating status of the air source heat pump unit according to preset air source heat pump unit operating rules, further includes: the cooling operation rules include:

[0024] When the frequency control mode of the air source heat pump unit is set to stop at the set temperature, if the following conditions are met: actual room temperature ≤ preset room temperature - 1℃, or inlet water temperature ≤ preset room temperature - hysteresis temperature, the air source heat pump unit will stop cooling.

[0025] When the air source heat pump unit is in a shutdown state, if the following conditions are met: inlet water temperature ≤ preset room temperature + hysteresis temperature and actual room temperature ≤ preset room temperature + 1℃, the air source heat pump unit will remain in a shutdown state; otherwise, it will be turned on for cooling.

[0026] Optionally, the heating operation rules in S2 include:

[0027] When the frequency control mode of the air source heat pump unit is set to the temperature-limited shutdown state, if the following conditions are met: actual room temperature ≥ preset room temperature + 1℃, or inlet water temperature ≥ preset room temperature + hysteresis temperature, the air source heat pump unit will stop heating.

[0028] When the frequency control mode of the air source heat pump unit is set to constant temperature frequency control, if the following conditions are met: actual room temperature ≥ preset room temperature, or inlet water temperature ≥ preset room temperature + hysteresis temperature, the air source heat pump unit will perform constant temperature control; if the following conditions are met: actual room temperature ≥ preset room temperature + 2℃, the air source heat pump unit will stop heating, otherwise it will maintain constant temperature control.

[0029] When the air source heat pump unit is in a shutdown state, if the following conditions are met: the inlet water temperature is ≥ the preset room temperature - the hysteresis temperature and the actual room temperature is ≥ the preset room temperature - 1℃, then the air source heat pump unit will remain in a shutdown state; otherwise, it will start heating.

[0030] Optionally, the fan operation rules in S2 include:

[0031] When the frequency control mode of the fan is set to stop at the temperature, the fan will run at high speed.

[0032] When the frequency control mode of the fan is set to constant temperature frequency control and the air source heat pump unit is in cooling mode, if the following conditions are met: actual room temperature ≤ preset room temperature, the fan will be set to low speed operation; if the following conditions are met: actual room temperature > preset room temperature + 1℃, the fan will be set to high speed operation; if the following conditions are met: inlet water temperature ≤ preset room temperature - hysteresis temperature and actual room temperature > preset room temperature, the fan will be set to high speed operation.

[0033] When the frequency control mode of the fan is set to constant temperature frequency control and the air source heat pump unit is in heating mode, if the following conditions are met: actual room temperature ≥ preset room temperature, the fan will be set to low speed operation; if the following conditions are met: actual room temperature < preset room temperature - 1℃, the fan will be set to high speed operation; if the following conditions are met: inlet water temperature ≥ preset room temperature + hysteresis temperature and actual room temperature < preset room temperature, the fan will be set to high speed operation.

[0034] Optionally, S2 further includes: when controlling the cooling operation status of the air source heat pump unit, performing cooling operation protection based on preset cooling protection rules, the cooling protection rules including:

[0035] If the outlet water temperature is detected to be ≤ 5℃ of the cooling return water overcooling protection temperature for the third time within 1 hour, an alarm will be triggered for the outlet water overcooling fault, and the unit will enter standby mode.

[0036] If the inlet water temperature is detected to be ≤ cooling return water overcooling protection temperature for the third time within 1 hour, an alarm will be triggered for the inlet water overcooling fault, and the unit will enter standby mode.

[0037] If the |outlet water temperature - inlet water temperature| is detected to be greater than or equal to the preset inlet and outlet water temperature difference for the third time within 1 hour, an alarm will be triggered for an excessive inlet and outlet water temperature difference fault, and the unit will enter standby mode.

[0038] Optionally, S2 further includes: when controlling the heating operation status of the air source heat pump unit, performing heating operation protection based on preset heating protection rules, wherein the heating protection rules include:

[0039] If the outlet water temperature is detected to be ≥ the heating outlet water overheat protection temperature for the third time within 1 hour, an alarm will be triggered for the outlet water overheating fault, and the unit will enter standby mode.

[0040] If the |outlet water temperature - inlet water temperature| is detected to be greater than or equal to the preset inlet and outlet water temperature difference for the third time within 1 hour, an alarm will be triggered for an excessive inlet and outlet water temperature difference fault, and the unit will enter standby mode.

[0041] In a second aspect, the present invention provides a control system for an air source heat pump unit, the control system comprising:

[0042] The acquisition module is used to acquire real-time room temperature parameters and determine the operating mode of the air source heat pump unit based on the room temperature parameters.

[0043] The control module is used to control the operating status of the air source heat pump unit according to the preset air source heat pump unit operating rules based on the room temperature parameters and the working mode of the air source heat pump unit, and to control the working status of the fan according to the preset fan operating rules.

[0044] (III) Beneficial Effects

[0045] First, the present invention determines the working mode of the air source heat pump unit by acquiring room temperature parameters, including the preset room temperature and the actual room temperature. Then, based on this, the operation of the air source heat pump unit is automatically controlled according to the preset operating rules, making the whole control process more convenient and efficient.

[0046] Secondly, while controlling the operation of the air source heat pump unit, the present invention controls the fan according to the preset fan operation rules, thereby reducing the fan noise after temperature control balance, which improves the user's noise experience to a certain extent.

[0047] Finally, while controlling the operation of the air source heat pump unit, the present invention employs first, second, and third protection rules to respectively protect against excessively high exhaust temperature, excessively cold cooling water outlet temperature, and excessively cold cooling water return temperature, thereby avoiding false alarms from the flow switch and reducing maintenance and service workload. Attached Figure Description

[0048] Figure 1 This is a schematic flowchart of a control method for an air source heat pump unit provided in one embodiment of the present invention;

[0049] Figure 2 A schematic diagram of the cooling and heating process of an air source heat pump unit provided in an embodiment of the present invention;

[0050] Figure 3 A schematic diagram of the compressor constant temperature control process provided in one embodiment of the present invention;

[0051] Figure 4 A flowchart illustrating the main and auxiliary valve opening control subroutine provided in one embodiment of the present invention;

[0052] Figure 5 A flowchart illustrating the cooling and heating protection rules provided in one embodiment of the present invention; Detailed Implementation

[0053] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] This invention provides a control method and system for air source heat pump units.

[0055] This invention acquires room temperature parameters to determine the operating mode of an air-source heat pump unit, thereby enabling control over its operational status. Compared to existing technologies, users can directly control the unit's operation based on indoor temperature. Temperature control balancing reduces fan noise and eliminates a small number of false alarms related to water system cavitation.

[0056] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0057] Example 1

[0058] This embodiment proposes a control method for an air source heat pump unit. The main components of the air source heat pump unit in this embodiment include a compressor, a water pump, a fan, and a water-heat exchanger. Specifically, as follows... Figure 1 As shown, the control method for an air source heat pump unit includes the following steps S1~S2:

[0059] S1. Obtain real-time room temperature parameters and determine the operating mode of the air source heat pump unit based on the room temperature parameters.

[0060] In this embodiment, the room temperature parameters include: preset room temperature and actual room temperature; the operating modes of the air source heat pump unit include: cooling mode and heating mode.

[0061] Based on the aforementioned step S1, regarding the determination of the operating mode of the air source heat pump unit, it should be noted that: when the actual room temperature is higher than the preset room temperature, the air source heat pump unit starts the cooling mode; when the actual room temperature is lower than the preset room temperature, the air source heat pump unit starts the heating mode.

[0062] In this embodiment, by acquiring the room temperature parameter based on the aforementioned technical means, it is possible to directly control the operating status of the unit.

[0063] S2. Based on room temperature parameters and the working mode of the air source heat pump unit, control the operating status of the air source heat pump unit according to the preset air source heat pump unit operating rules, and control the working status of the fan according to the preset fan operating rules.

[0064] In this embodiment, the operating rules of the air source heat pump unit include: cooling operation rules and heating operation rules; the working status of the fan includes: shutdown status, high fan speed status and low fan speed status.

[0065] In step S2 above, it is also necessary to obtain the inlet water temperature T of the water heat exchanger. 进水 .

[0066] Based on the aforementioned step S2, regarding the control of the operating status of the air source heat pump unit, it should be noted that, as Figure 2 As shown:

[0067] Specifically, the operating mode of the unit needs to be determined based on the aforementioned step S1. The operating modes include cooling and heating modes.

[0068] Firstly, when it is determined that the unit's operating mode is cooling mode, it should be noted that:

[0069] Data collection is required. The data to be collected includes the preset room temperature and the actual room temperature in step S1 above. The unit is controlled and operated based on the collected data, and then the unit outputs relevant data. Parameter 117 (frequency control mode of air source heat pump unit) is determined based on the output data of the unit. Parameter 117 can be set to 0 (shutdown state when temperature reaches the limit) or 1 (constant temperature frequency control state).

[0070] When parameter 117 is set to 0, if room temperature ≤ P 27 When -1℃ (i.e., actual room temperature ≤ preset room temperature -1℃), or when T is satisfied 进水 ≤P 04 -P 01 When the inlet water temperature is less than or equal to the preset room temperature minus the hysteresis temperature, the air source heat pump unit stops cooling and enters standby mode. If neither of the above two conditions is met, the opening degree of the main and auxiliary valves is controlled to make the actual room temperature approach the preset room temperature, and the unit continues to be controlled and operated.

[0071] When parameter 117 is set to 1, if room temperature ≤ P 27 When (i.e., actual room temperature ≤ preset room temperature), or when T is satisfied 进水 ≤P 04 -P 01When the inlet water temperature is ≤ preset room temperature - hysteresis temperature, the unit will perform constant temperature control. If neither of the above two conditions is met, the opening of the main and auxiliary valves will be controlled to make the actual room temperature approach the preset room temperature, and the unit will continue to be controlled and operated. Furthermore, when the unit is performing constant temperature control, if the room temperature is ≤ P 27 If the actual room temperature is -2℃ (i.e., the actual room temperature is ≤ the preset room temperature -2℃), the air source heat pump unit will stop cooling and enter standby mode; otherwise, it will maintain constant temperature control.

[0072] If the unit is in standby mode, the water pump continues to run, and then it is determined whether the following condition is met: T 进水 ≤P 04 +P 01 And room temperature ≤ P 27 If the temperature is +1℃ (i.e., the inlet water temperature ≤ preset room temperature + hysteresis temperature and the actual room temperature ≤ preset room temperature + 1℃), the air source heat pump unit will remain in a shutdown state; otherwise, it will start cooling and obtain the target data through the start cooling.

[0073] Secondly, when it is determined that the unit's operating mode is heating mode, it should be noted that:

[0074] Data collection is required. The data to be collected includes the preset room temperature and the actual room temperature in step S1 above. The unit is controlled and operated based on the collected data, and then the unit outputs relevant data. Parameter 117 (frequency control mode of air source heat pump unit) is determined based on the output data of the unit. Parameter 117 can be set to 0 (shutdown state when temperature reaches the limit) or 1 (constant temperature frequency control state).

[0075] When parameter 117 is set to 0, if room temperature ≥ P 03 When +1℃ (i.e., actual room temperature ≥ preset room temperature +1℃), or when T is satisfied 进水 ≥P 05 +P 01 When the inlet water temperature is greater than or equal to the preset room temperature plus the hysteresis temperature, the air source heat pump unit stops heating and enters standby mode. If neither of the above two conditions is met, the opening degree of the main and auxiliary valves is controlled to make the actual room temperature approach the preset room temperature, and the unit continues to be controlled and operated.

[0076] When parameter 117 is set to 1, if room temperature ≥ P 03 When (i.e., actual room temperature ≥ preset room temperature), or when T is satisfied 进水 ≥P 05 +P 01When the inlet water temperature is ≥ preset room temperature + hysteresis temperature, the unit will perform constant temperature control. If neither of the above two conditions is met, the opening of the main and auxiliary valves will be controlled to make the actual room temperature approach the preset room temperature, and the unit will continue to be controlled and operated. Furthermore, when the unit is performing constant temperature control, if the room temperature is ≥ P... 03 If the actual room temperature is ≥ preset room temperature +2℃, the air source heat pump unit will stop heating and enter standby mode; otherwise, it will maintain constant temperature control.

[0077] If the unit is in standby mode, the water pump continues to run, and then it is determined whether the following condition is met: T 进水 ≥P 05 -P 01 And room temperature ≥ P 03 -1℃ (i.e., inlet water temperature ≥ preset room temperature - hysteresis temperature and actual room temperature ≥ preset room temperature - 1℃). If this condition is met, the air source heat pump unit will remain in a shutdown state; otherwise, it will start heating and obtain target data through the start-up heating mechanism.

[0078] In this embodiment, regarding the constant temperature control mentioned in the first and second points above, it should be noted that when the unit is performing constant temperature control, the compressor operates at a variable frequency according to a preset algorithm, and the fan operates at a low speed, which can reduce the noise generated by the fan operation to a certain extent and improve the user experience.

[0079] In this embodiment, the preset algorithm corresponding to the aforementioned compressor includes:

[0080] When parameter 117 is set to 1, the compressor performs constant temperature control; specifically, as follows: Figure 3 As shown.

[0081] When the unit is cooling, if the room temperature is ≤ P 27 Time or T 进水 ≤P 04 -P 01 At that time, it enters constant temperature control.

[0082] When the unit is cooling, when the room temperature is ≤ parameter P 27 When this condition enters the constant temperature control state, step (A) is executed. Step (A) includes: the fan running at low speed, starting from the compressor frequency of 46Hz, when the room temperature is within range P. 27 At ±0.3℃, the frequency remained constant; when room temperature < P 27 At -0.3℃, if the temperature does not rise, the frequency decreases by 2Hz every 30 seconds; when room temperature > P 27 If the temperature does not decrease at +0.3℃, the frequency increases by 2Hz every 30 seconds; when the room temperature is ≥P 27 At +1℃, the fan runs at high speed and resumes the set operating frequency.

[0083] When the unit is cooling, when due to T 进水 ≤P 04 -P 01 When this condition is met with constant temperature control, the compressor frequency remains unchanged, and when T... 进水 Located in (P) 04 -P 01 When T is within ±0.3℃, maintain the original frequency; when T 进水 < (P 04 -P 01 At -0.3℃, if the temperature does not rise, the frequency decreases by 2Hz every 30 seconds; when T 进水 > (P 04 -P 01 If the temperature does not decrease when the room temperature is +0.3℃, then increase the frequency by 2Hz every 30 seconds until the room temperature is ≤P27, then perform the aforementioned step (A).

[0084] When the unit is in heating mode, if the room temperature is ≥ P 03 Time or T 进水 ≥P 05 +P 01 At that time, it enters constant temperature control.

[0085] When the unit is in heating mode, if the room temperature is greater than or equal to parameter P 03 When this condition is met for constant temperature control, step (B) is executed. Step (B) includes: the fan running at low speed, starting from the compressor frequency of 40Hz, when the room temperature is within range P. 03 At ±0.3℃, the frequency remained constant; when room temperature > P 03 If the temperature does not decrease at +0.3℃, the frequency will decrease by 2Hz every 30 seconds; when the room temperature is <P 03 At -0.3℃, if the temperature does not rise, the frequency increases by 2Hz every 30 seconds; when the room temperature is ≤ P 03 At -1℃, the fan runs at high speed and resumes the set operating frequency.

[0086] When the unit is in heating mode, when due to T 进水 ≥P 05 +P 01 When this condition is met with constant temperature control, the compressor frequency remains unchanged, and when T... 进水 Located in (P) 05 +P 01 When T is within ±0.3℃, maintain the original frequency; when T 进水 > (P 05 +P 01 If the temperature does not decrease at +0.3℃, then the frequency decreases by 2Hz every 30 seconds; when T 进水 < (P 05 +P 01 If the temperature does not rise when the temperature is -0.3℃, then increase the frequency by 2Hz every 30 seconds until the room temperature is ≥ P. 03At that time, perform the aforementioned step (B).

[0087] Based on the aforementioned step S2, regarding the control of the fan's operating status, it should also be noted that the control of the fan is carried out synchronously with the control of the air source heat pump unit. The purpose is to reduce the fan noise after temperature control is balanced.

[0088] In this embodiment, the preset fan operation rules include:

[0089] When the frequency control mode of the fan is set to stop at the temperature, the fan will run at high speed.

[0090] When the frequency control mode of the fan is set to constant temperature frequency control and the air source heat pump unit is in cooling mode, if the following conditions are met: actual room temperature ≤ preset room temperature, the fan will be set to low speed operation; if the following conditions are met: actual room temperature > preset room temperature + 1℃, the fan will be set to high speed operation; if the following conditions are met: inlet water temperature ≤ preset room temperature - hysteresis temperature and actual room temperature > preset room temperature, the fan will be set to high speed operation.

[0091] When the frequency control mode of the fan is set to constant temperature frequency control and the air source heat pump unit is in heating mode, if the following conditions are met: actual room temperature ≥ preset room temperature, the fan will be set to low speed operation; if the following conditions are met: actual room temperature < preset room temperature - 1℃, the fan will be set to high speed operation; if the following conditions are met: inlet water temperature ≥ preset room temperature + hysteresis temperature and actual room temperature < preset room temperature, the fan will be set to high speed operation.

[0092] In this embodiment, regarding the control of the main and auxiliary valve openings mentioned in the first and second points above, it should be noted that:

[0093] This invention improves the unit system energy efficiency by 10% by using preset main and auxiliary valve opening control subroutines to control the opening of the aforementioned main and auxiliary valves; the preset main and auxiliary valve opening control subroutines are as follows: Figure 4 As shown.

[0094] Specifically, the preset main valve opening control subroutine includes: when the unit is in cooling mode, setting the main valve target superheat DTs to P. 02 The actual superheat DTCn of the main valve in this cycle is calculated based on DTCn=Ts-Tc; when the unit is in cooling mode, the target superheat DTs of the main valve is set to P. 18 The actual superheat DTCn of the main valve in this cycle is calculated based on DTCn=Ts-Tc. The change in the opening degree of the electronic expansion valve ΔP in each cycle is calculated based on ΔP=|DTCn-DTs|, and it is determined that the compressor discharge temperature Td≥P. 19 Whether it holds true, if Td≥P 19If true, the expansion valve opens 10 steps every 30 seconds (i.e., EXVn = (EXVn-1) + 10) until Td is satisfied. <P 19 Determine if ΔP≤1 is satisfied. If not, calculate the actual opening degree EXVn of the electronic expansion valve for this cycle according to EXVn=(EXVn-1)+(KP(DTCn-DTs)+KD(DTCn-(DTCn-1))) and return to initialization. If ΔP≤1 is satisfied, execute the preset main valve opening control subroutine.

[0095] Specifically, the preset auxiliary valve opening control subroutine includes: when the unit is in cooling mode, setting the target superheat TDs of the cooling enthalpy increase valve to P. 24 The actual superheat TDn of the auxiliary valve in this cycle is calculated based on TDn=Td-Tp; when the unit is in cooling mode, the target superheat TDs of the main valve is set to P. 36 And according to TDn=Td-T 出水 Calculate the actual superheat TDn of the auxiliary valve in this cycle. Calculate the change in electronic expansion valve opening ΔP per cycle based on ΔP = |TDn - TDs|, and determine if the compressor discharge temperature Td ≥ P. 19 Whether it holds true, if Td≥P 19 If the condition is met, the return operation is executed; if ΔP≤1 is not met, the actual opening degree EXVn of the electronic expansion valve in this cycle is calculated according to EXVn=(EXVn-1)+[KP(DTCn-DTs)+KD(DTCn-(DTCn-1))], and the subroutine is re-executed.

[0096] In this embodiment, Ts is the compressor suction temperature, Tc is the internal coil temperature, and P... 19 The main expansion valve regulates the exhaust temperature, EXVn is the opening degree of the electronic expansion valve in the current cycle, EXVn-1 is the opening degree of the electronic expansion valve in the previous cycle, DTCn is the actual superheat in the current cycle, DTCn-1 is the actual superheat in the previous cycle, Td is the compressor exhaust temperature, Tp is the external exhaust pipe temperature, and KP and KD are adjustable parameters.

[0097] Based on the aforementioned step S2, it should be noted that when controlling the cooling operation status of the air source heat pump unit, the unit operation protection is performed based on the preset protection rules, replacing the original flow mechanical switch, thereby eliminating a small number of false alarms due to water system cavitation.

[0098] In this embodiment, as Figure 5 As shown, the protection rules include cooling protection rules and heating protection rules. Specifically, the cooling protection rules are as follows:

[0099] If T is detected for the third time within 1 hour 出水 ≤P 41If the outlet water temperature is -1℃ (i.e., the outlet water temperature is ≤ the cooling return water overcooling protection temperature -5℃), an alarm will be triggered for the outlet water overcooling fault, and the unit will enter standby mode.

[0100] If T is detected for the third time within 1 hour 进水 ≤P 41 If the inlet water temperature is less than or equal to the cooling return water overcooling protection temperature, an alarm will be triggered for the inlet water overcooling fault, and the unit will enter standby mode.

[0101] If |T is detected for the third time within 1 hour 出水 -T 进水 |≥P 43 If the temperature difference between the inlet and outlet water is greater than or equal to the preset temperature difference between the inlet and outlet water, an alarm will be triggered for a fault where the temperature difference between the inlet and outlet water is too large, and the unit will enter standby mode.

[0102] The heating protection rules are as follows:

[0103] If T is detected for the third time within 1 hour 出水 ≥P 42 If the outlet water temperature is greater than or equal to the overheating protection temperature of the heating outlet water, an alarm will be triggered for the overheating fault of the outlet water, and the unit will enter standby mode.

[0104] If |T is detected for the third time within 1 hour 出水 -T 进水 |≥P 43 If the temperature difference between the inlet and outlet water is greater than or equal to the preset temperature difference between the inlet and outlet water, an alarm will be triggered for a fault where the temperature difference between the inlet and outlet water is too large, and the unit will enter standby mode.

[0105] In this embodiment, firstly, by acquiring room temperature parameters including preset and actual room temperatures, the operating mode of the air source heat pump unit is determined. Based on this, the operation of the air source heat pump unit is automatically controlled according to preset operating rules, making the entire control process more convenient. Secondly, while controlling the operation of the air source heat pump unit, the fan is controlled according to preset fan operating rules, thereby reducing fan noise after temperature control balance, improving the user's noise experience to some extent. Thirdly, while controlling the operation of the air source heat pump unit, first, second, and third protection rules are adopted to protect against excessively high exhaust temperature, excessively low cooling water temperature, and excessively low cooling water temperature, respectively, thus avoiding false alarms from the flow switch and reducing maintenance and service workload. Finally, by setting preset main and auxiliary valve opening control subroutines to control the opening of the aforementioned main and auxiliary valves, the energy efficiency of the unit system can be improved by 10%.

[0106] Example 2

[0107] This embodiment proposes a control system for an air source heat pump unit, the control system including an acquisition module and a control module.

[0108] In this embodiment, the acquisition module is used to acquire real-time indoor temperature parameters and determine the operating mode of the air source heat pump unit based on the indoor temperature parameters.

[0109] In this embodiment, the control module is used to control the operating status of the air source heat pump unit according to the indoor temperature parameters and the working mode of the air source heat pump unit, and to control the working status of the fan according to the preset operating rules of the air source heat pump unit.

[0110] In this embodiment, firstly, by acquiring room temperature parameters, including preset room temperature and actual room temperature, the operating mode of the air source heat pump unit is determined. Then, based on this, the operation of the air source heat pump unit is automatically controlled according to preset operating rules, making the entire control process more convenient. Secondly, while controlling the operation of the air source heat pump unit, the fan is also controlled according to preset fan operating rules. This reduces fan noise after temperature control balance is achieved, improving the user's noise experience to some extent.

[0111] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0112] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions.

[0113] It should be noted that any reference numerals placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In claims that enumerate several means, several of these means may be embodied by the same hardware. The use of the terms first, second, third, etc., is merely for convenience of expression and does not indicate any order. These terms can be understood as part of the component names.

[0114] Furthermore, it should be noted that in the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0115] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the claims should be interpreted to include both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0116] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, then this invention should also include these modifications and variations.

Claims

1. A control method for an air source heat pump unit, the air source heat pump unit comprising a compressor, a water pump, a fan, and a water-heat exchanger, characterized in that, The control method includes: S1. Obtain real-time room temperature parameters and determine the operating mode of the air source heat pump unit based on the room temperature parameters; The room temperature parameters include: preset room temperature and actual room temperature; the operating modes of the air source heat pump unit include: cooling mode and heating mode. S2. Based on room temperature parameters and the working mode of the air source heat pump unit, control the operating status of the air source heat pump unit according to the preset air source heat pump unit operating rules, and control the working status of the fan according to the preset fan operating rules. The operating rules of the air source heat pump unit include: cooling operation rules and heating operation rules; the working status of the fan includes: shutdown status, high fan speed status and low fan speed status. Obtain the inlet and outlet water temperatures of the water heat exchanger; The cooling operation rules include: when the frequency control mode of the air source heat pump unit is set to constant temperature frequency control, if the following conditions are met: actual room temperature ≤ P 27 , or satisfy: T 进水 ≤P 04 -P 01 Then the air source heat pump unit will perform constant temperature control; if the following condition is met: actual room temperature ≤ P 27 When the temperature is -2℃, the air source heat pump unit stops cooling; otherwise, it maintains constant temperature control. The constant temperature control methods involved in the refrigeration operation rules include: 1) When the following condition is met: actual room temperature ≤ P 27 Execute step W; 2) When T is satisfied: 进水 ≤P 04 -P 01 The compressor frequency remains constant, when T 进水 Located in (P) 04 -P 01 When T is within ±0.3℃, maintain the original frequency; when T 进水 < (P 04 -P 01 At -0.3℃, if the temperature does not rise, the frequency decreases by 2Hz every 30 seconds; when T 进水 > (P 04 -P 01 If the temperature does not decrease when the room temperature is +0.3℃, then increase the frequency by 2Hz every 30 seconds until the room temperature is ≤P27, then execute step W. The step W includes: the fan running at low speed, starting from the compressor frequency of 46Hz, when the room temperature is within the range P. 27 At ±0.3℃, the frequency remained constant; when room temperature < P 27 At -0.3℃, if the temperature does not rise, the frequency decreases by 2Hz every 30 seconds; when room temperature > P 27 If the temperature does not decrease at +0.3℃, the frequency increases by 2Hz every 30 seconds; when the room temperature is ≥P 27 At +1℃, the fan runs at high speed, restoring the set operating frequency; P 27 The preset room temperature; T 进水 P represents the inlet water temperature. 04 Preset water temperature; P 01 Hysteresis temperature; The operating rules for the fan in S2 include: When the frequency control mode of the fan is set to stop at the temperature, the fan will run at high speed. When the frequency control mode of the fan is set to constant temperature frequency control and the air source heat pump unit is in cooling mode, if the following conditions are met: actual room temperature ≤ preset room temperature, the fan will be set to low speed operation; if the following conditions are met: actual room temperature > preset room temperature + 1℃, the fan will be set to high speed operation; if the following conditions are met: inlet water temperature ≤ preset room temperature - hysteresis temperature and actual room temperature > preset room temperature, the fan will be set to high speed operation. When the frequency control mode of the fan is set to constant temperature frequency control and the air source heat pump unit is in heating mode, if the following conditions are met: actual room temperature ≥ preset room temperature, the fan will be set to low speed operation; if the following conditions are met: actual room temperature < preset room temperature - 1℃, the fan will be set to high speed operation; if the following conditions are met: inlet water temperature ≥ preset room temperature + hysteresis temperature and actual room temperature < preset room temperature, the fan will be set to high speed operation.

2. The control method according to claim 1, characterized in that, The step S1 involves acquiring room temperature parameters and determining the operating mode of the air source heat pump unit based on these parameters, including: When the actual room temperature is higher than the preset room temperature, the air source heat pump unit starts the cooling mode; when the actual room temperature is lower than the preset room temperature, the air source heat pump unit starts the heating mode.

3. The control method according to claim 1, characterized in that, S2 includes, When controlling the operating status of an air source heat pump water heater, the operating status of the fan is controlled synchronously.

4. The control method according to claim 1, characterized in that, The S2 step of controlling the operating status of the air source heat pump unit according to the preset air source heat pump unit operating rules also includes: The refrigeration operation rules include: When the frequency control mode of the air source heat pump unit is set to stop at the set temperature, if the following conditions are met: actual room temperature ≤ preset room temperature - 1℃, or inlet water temperature ≤ preset room temperature - hysteresis temperature, the air source heat pump unit will stop cooling. When the air source heat pump unit is in a shutdown state, if the following conditions are met: inlet water temperature ≤ preset room temperature + hysteresis temperature and actual room temperature ≤ preset room temperature + 1℃, the air source heat pump unit will remain in a shutdown state; otherwise, it will be turned on for cooling.

5. The control method according to claim 4, characterized in that, The heating operation rules in S2 include: When the frequency control mode of the air source heat pump unit is set to the temperature-limited shutdown state, if the following conditions are met: actual room temperature ≥ preset room temperature + 1℃, or inlet water temperature ≥ preset room temperature + hysteresis temperature, the air source heat pump unit will stop heating. When the frequency control mode of the air source heat pump unit is set to constant temperature frequency control, if the following conditions are met: actual room temperature ≥ preset room temperature, or inlet water temperature ≥ preset room temperature + hysteresis temperature, the air source heat pump unit will perform constant temperature control; if the following conditions are met: actual room temperature ≥ preset room temperature + 2℃, the air source heat pump unit will stop heating, otherwise it will maintain constant temperature control. When the air source heat pump unit is in a shutdown state, if the following conditions are met: the inlet water temperature is ≥ the preset room temperature - the hysteresis temperature and the actual room temperature is ≥ the preset room temperature - 1℃, then the air source heat pump unit will remain in a shutdown state; otherwise, it will start heating.

6. The control method according to claim 4, characterized in that, The S2 further includes: when controlling the cooling operation status of the air source heat pump unit, performing cooling operation protection based on preset cooling protection rules, the cooling protection rules including: If the outlet water temperature is detected to be ≤ 5℃ of the cooling return water overcooling protection temperature for the third time within 1 hour, an alarm will be triggered for the outlet water overcooling fault, and the unit will enter standby mode. If the inlet water temperature is detected to be ≤ cooling return water overcooling protection temperature for the third time within 1 hour, an alarm will be triggered for the inlet water overcooling fault, and the unit will enter standby mode. If the |outlet water temperature - inlet water temperature| is detected to be greater than or equal to the preset inlet and outlet water temperature difference for the third time within 1 hour, an alarm will be triggered for an excessive inlet and outlet water temperature difference fault, and the unit will enter standby mode.

7. The control method according to claim 4, characterized in that, The S2 further includes: when controlling the heating operation status of the air source heat pump unit, performing heating operation protection based on preset heating protection rules, wherein the heating protection rules include: If the outlet water temperature is detected to be ≥ the heating outlet water overheat protection temperature for the third time within 1 hour, an alarm will be triggered for the outlet water overheating fault, and the unit will enter standby mode. If the |outlet water temperature - inlet water temperature| is detected to be greater than or equal to the preset inlet and outlet water temperature difference for the third time within 1 hour, an alarm will be triggered for an excessive inlet and outlet water temperature difference fault, and the unit will enter standby mode.

8. A control system based on the control method for an air source heat pump unit as described in claim 1, characterized in that, The control system includes: The acquisition module is used to acquire real-time room temperature parameters and determine the operating mode of the air source heat pump unit based on the room temperature parameters. The control module is used to control the operating status of the air source heat pump unit according to the preset air source heat pump unit operating rules based on the room temperature parameters and the working mode of the air source heat pump unit, and to control the working status of the fan according to the preset fan operating rules.

Images