Heat pump heating water system and control method thereof

Abstract

The embodiment of the invention provides a heat pump heating water system and a control method of the heat pump heating water system. The heat pump heating water system comprises a heat pump unit, a heat dissipation module, a water pump module and a control module. The water pump module comprises an outflow pipeline, a backflow pipeline, a water flow switch, a water pump, a first three-way valve and a second three-way valve. The control module is used for controlling the on-off states of the first three-way valve and the second three-way valve so as to switch water flow circulation paths in the water pump module and obtain the on-off states of the water flow switch under different water flow circulation paths; the abnormal position of the water flow is determined according to the on-off state of the water flow switch under different water flow circulation paths, so that after-sales personnel can quickly position the abnormal position of the water flow, maintenance is carried out, and the after-sales processing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a heat pump heating water system and a control method of the heat pump heating water system. Background Art

[0002] At present, the use of heat pump heating water system has gradually become the main trend. In the heat pump heating water system, flow monitoring is carried out through a water flow switch. The current common control method is that when abnormal water flow is detected, no matter whether the heat pump unit is in cooling or heating mode, the heat pump unit will report a water flow abnormality fault and shut down, reminding the user to deal with the abnormal water flow problem and report it to after-sales personnel for processing.

[0003] When after-sales personnel are dealing with abnormal water flow, if there is a blockage in the system's pipeline, they cannot quickly locate the blockage, which affects the efficiency of after-sales processing. Summary of the invention

[0004] In view of the above problems, embodiments of the present invention are proposed to provide a heat pump heating water system and a control method for a heat pump heating water system that overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above problems, an embodiment of the present invention discloses a heat pump heating water system, comprising:

[0006] Heat pump unit, cooling module, water pump module and control module;

[0007] The water pump module is connected to the heat pump unit and the heat dissipation module, and is used to transfer heat between the heat pump unit and the heat dissipation module through water flow;

[0008] The water pump module includes an outflow pipeline, a return pipeline, a water flow switch, a water pump and a first three-way valve arranged on the outflow pipeline in sequence, and a second three-way valve arranged on the return pipeline; a first port of the first three-way valve is connected to the water pump, a second port is connected to the heat dissipation module, and a third port is connected to the return pipeline between the heat dissipation module and the second three-way valve; a fourth port of the second three-way valve is connected to the heat dissipation module, a fifth port is connected to the outflow pipeline between the water flow switch and the heat pump unit, and a sixth port is connected to the heat pump unit;

[0009] A control module is used to control the switching states of the first three-way valve and the second three-way valve to switch the water flow path in the water pump module, and to obtain the switching states of the water flow switch under different water flow paths; and to determine the abnormal water flow position according to the switching states of the water flow switch under different water flow paths.

[0010] Optionally, the control module is used to control the first port and the third port of the first three-way valve to be opened, and the second port to be closed; control the fourth port and the sixth port of the second three-way valve to be opened, and the fifth port to be closed; after a first time has passed, detect the switching state of the water flow switch; if it is detected that the water flow switch is opened, determine that the abnormal water flow position is in the heat dissipation module; if it is detected that the water flow switch is closed, determine that the abnormal water flow position is in the heat pump unit or the water pump module; after determining that the abnormal water flow position is in the heat pump unit or the water pump module, control the first port and the third port of the first three-way valve to be opened, and the second port to be closed; control the fifth port and the sixth port of the second three-way valve to be opened, and the fourth port to be closed; after a second time has passed, detect the switching state of the water flow switch; if it is detected that the water flow switch is opened, determine that the abnormal water flow position is in the heat pump unit, and if it is detected that the water flow switch is closed, determine that the abnormal water flow position is in the water pump module.

[0011] Optionally, the heat pump unit comprises: a heat pump pipeline, a first heat exchanger, a compressor, a second heat exchanger, and a throttle valve connected by the heat pump pipeline;

[0012] The control module is also used to control the first port and the second port of the first three-way valve to be opened and the third port to be closed in the heating mode; control the fourth port and the sixth port of the second three-way valve to be opened and the fifth port to be closed; when the water flow switch is disconnected, control the operating frequency of the compressor to be reduced to the first frequency; after the water flow switch is disconnected and a third time has passed, obtain the first pressure value of the compressor; after a fourth time has passed, obtain the second pressure value of the compressor; determine the first pressure temperature according to the first pressure value; determine the second pressure temperature according to the second pressure value; determine the pressure-temperature difference according to the second pressure temperature and the first pressure temperature; and adjust the frequency of the compressor according to the pressure-temperature difference.

[0013] Optionally, the control module is used to determine that the operating frequency interval of the compressor is a first frequency interval if the pressure-temperature difference is less than or equal to a first threshold, and determine a candidate operating frequency in the first frequency interval; if the pressure-temperature difference is greater than the first threshold and less than or equal to a second threshold, determine that the operating frequency interval of the compressor is a second frequency interval, and determine a candidate operating frequency in the second frequency interval; if the pressure-temperature difference is greater than the second threshold and less than or equal to a third threshold, determine that the operating frequency of the compressor is the first frequency; if the pressure-temperature difference is greater than the third threshold, control the compressor to stop.

[0014] Optionally, the control module is also used to obtain the first water inlet temperature and the first water outlet temperature of the second heat exchanger after the water flow switch is disconnected and a third time has passed; obtain the second water inlet temperature and the second water outlet temperature of the second heat exchanger after a fourth time has passed; determine a first water temperature difference based on the first water outlet temperature and the first water inlet temperature; determine a second water temperature difference based on the second water outlet temperature and the second water inlet temperature; determine a target water temperature difference based on the second water temperature difference and the first water temperature difference; and adjust the frequency of the compressor based on the target water temperature difference.

[0015] Optionally, the control module is used to increase the first frequency increase amplitude at the candidate operating frequency if the target water temperature difference is less than or equal to a fourth threshold; increase the second frequency increase amplitude at the candidate operating frequency if the target water temperature difference is greater than the fourth threshold and less than or equal to a fifth threshold; keep the compressor operating frequency unchanged if the target water temperature difference is greater than the fifth threshold and less than or equal to a sixth threshold; and determine that the compressor operating frequency is the first frequency if the target water temperature difference is greater than the sixth threshold.

[0016] Optionally, the control module is also used to control the first port and the second port of the first three-way valve to be opened, and the third port to be closed in the cooling mode; control the fourth port and the sixth port of the second three-way valve to be opened, and the fifth port to be closed; and control the heat pump unit to shut down when the water flow switch is disconnected.

[0017] Optionally, the heat pump unit further includes:

[0018] A pressure sensor, connected to the compressor, for detecting a pressure value of the compressor;

[0019] an outlet water temperature sensing package, connected to the first heat exchanger, and used to detect the temperature of the water flowing out of the first heat exchanger;

[0020] The water inlet temperature sensing package is connected to the first heat exchanger and is used to detect the temperature of the water flow entering the first heat exchanger.

[0021] The embodiment of the present invention further discloses a control method for a heat pump heating water system, the method comprising:

[0022] Controlling the switch states of the first three-way valve and the second three-way valve to switch the water flow path in the water pump module;

[0023] Acquiring the switch state of the water flow switch under different water flow paths;

[0024] The abnormal water flow position is determined according to the switch state of the water flow switch under different water flow paths.

[0025] Optionally, determining the abnormal water flow position according to the switch state of the water flow switch under different water flow paths includes:

[0026] Control the first port and the third port of the first three-way valve to be opened, and the second port to be closed; control the fourth port and the sixth port of the second three-way valve to be opened, and the fifth port to be closed;

[0027] After the first time has passed, the switch state of the water flow switch is detected; if it is detected that the water flow switch is turned on, it is determined that the abnormal water flow position is in the heat dissipation module; if it is detected that the water flow switch is turned off, it is determined that the abnormal water flow position is in the heat pump unit or the water pump module;

[0028] After determining that the abnormal water flow position is in the heat pump unit or the water pump module, control the first port and the third port of the first three-way valve to be opened, and the second port to be closed; control the fifth port and the sixth port of the second three-way valve to be opened, and the fourth port to be closed; after a second time has passed, detect the switching state of the water flow switch; if it is detected that the water flow switch is opened, determine that the abnormal water flow position is in the heat pump unit, and if it is detected that the water flow switch is closed, determine that the abnormal water flow position is in the water pump module.

[0029] Optionally, in the heating mode, the first port and the second port of the first three-way valve are controlled to be opened, and the third port is controlled to be closed; the fourth port and the sixth port of the second three-way valve are controlled to be opened, and the fifth port is controlled to be closed;

[0030] When the water flow switch is disconnected, controlling the operating frequency of the compressor to decrease to a first frequency;

[0031] After the water flow switch is turned off and a third time has passed, obtaining a first pressure value of the compressor;

[0032] After a fourth time has passed, obtaining a second pressure value of the compressor;

[0033] determining a first pressure temperature according to the first pressure value;

[0034] determining a second pressure temperature according to the second pressure value;

[0035] determining a pressure-temperature difference according to the second pressure-temperature and the first pressure-temperature;

[0036] The frequency of the compressor is adjusted according to the pressure-temperature difference.

[0037] Optionally, adjusting the frequency of the compressor according to the pressure-temperature difference includes:

[0038] If the pressure-temperature difference is less than or equal to a first threshold, determining that the operating frequency interval of the compressor is a first frequency interval, and determining a candidate operating frequency in the first frequency interval;

[0039] If the pressure-temperature difference is greater than a first threshold and less than or equal to a second threshold, determining that the operating frequency interval of the compressor is a second frequency interval, and determining a candidate operating frequency in the second frequency interval;

[0040] If the pressure-temperature difference is greater than a second threshold value and less than or equal to a third threshold value, determining that the operating frequency of the compressor is a first frequency;

[0041] If the pressure-temperature difference is greater than a third threshold, the compressor is controlled to stop.

[0042] Optionally, it also includes:

[0043] After the water flow switch is turned off and a third time has passed, obtaining a first water inlet temperature and a first water outlet temperature of the second heat exchanger;

[0044] After a fourth time has passed, obtaining a second water inlet temperature and a second water outlet temperature of the second heat exchanger;

[0045] Determining a first water temperature difference according to the first water outlet temperature and the first water inlet temperature;

[0046] determining a second water temperature difference according to the second water outlet temperature and the second water inlet temperature;

[0047] determining a target water temperature difference according to the second water temperature difference and the first water temperature difference;

[0048] The frequency of the compressor is adjusted according to the target water temperature difference.

[0049] Optionally, adjusting the frequency of the compressor according to the target water temperature difference includes:

[0050] If the target water temperature difference is less than or equal to a fourth threshold, increasing the first frequency increase amplitude at the candidate operating frequency;

[0051] If the target water temperature difference is greater than a fourth threshold and less than or equal to a fifth threshold, increasing the second frequency increase amplitude at the candidate operating frequency;

[0052] If the target water temperature difference is greater than the fifth threshold value and less than or equal to the sixth threshold value, the compressor operating frequency remains unchanged;

[0053] If the target water temperature difference is greater than a sixth threshold, the compressor operating frequency is determined to be the first frequency.

[0054] Optionally, it also includes:

[0055] In the cooling mode, the first port and the second port of the first three-way valve are controlled to be opened, and the third port is controlled to be closed; the fourth port and the sixth port of the second three-way valve are controlled to be opened, and the fifth port is controlled to be closed;

[0056] When the water flow switch is disconnected, the heat pump unit is controlled to shut down.

[0057] The embodiments of the present invention include the following advantages:

[0058] In an embodiment of the present invention, a heat pump heating water system includes a heat pump unit, a heat dissipation module, a water pump module and a control module; the water pump module includes an outflow pipeline, a return pipeline, a water flow switch, a water pump and a first three-way valve sequentially arranged on the outflow pipeline, and a second three-way valve arranged on the return pipeline; the control module is used to control the switch state of the first three-way valve and the second three-way valve to switch the water flow path in the water pump module; the water flow path in the water pump module is switched by adding two three-way valves in the water pump module; the abnormal water flow position is determined according to the switch state of the water flow switch under different water flow paths. This makes it convenient for after-sales personnel to quickly locate the abnormal water flow position, thereby performing maintenance and improving after-sales processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 is a structural diagram of a heat pump heating water system provided by an embodiment of the present invention;

[0060] Figure 2 is a structural diagram of another heat pump heating water system provided by an embodiment of the present invention;

[0061] Figure 3 It is a flow chart of the steps of a control method for a heat pump heating water system provided by an embodiment of the present invention.

[0062] Description of reference numerals:

[0063] Heat pump unit 10, heat dissipation module 11, water pump module 12, heat pump pipeline 101, first heat exchanger 102, compressor 103, second heat exchanger 104, throttle valve 105, pressure sensor 106, outlet water temperature sensing package 107, inlet water temperature sensing package 108, outlet pipeline 121, return pipeline 122, water flow switch 123, water pump 124, first three-way valve 125, second three-way valve 126. DETAILED DESCRIPTION

[0064] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0065] One of the core concepts of the embodiment of the present invention is to add a water pump module with a three-way valve to the air source heat pump heating water system. In the event of abnormal water flow, the abnormal water flow position in the water system can be quickly located by controlling the three-way valve and the on-off state of the water flow switch.

[0066] In the case of abnormal water flow, the actual water flow condition is obtained by analyzing the change of high-pressure temperature, and the compressor frequency control is optimized in combination with the change of inlet and outlet water temperature difference, so that the compressor can maintain the best heating output in the case of abnormal water flow, thereby improving user comfort.

[0067] Reference Figure 1 , shows a structural diagram of a heat pump heating water system provided by an embodiment of the present invention, and the system may specifically include:

[0068] Heat pump unit 10, heat dissipation module 11, water pump module 12 and control module (not shown in the figure);

[0069] The heat pump heating water system can provide heating mode and cooling mode. In the heating mode, the heat pump unit 10 is used to absorb heat from low-temperature heat sources (such as air, water, and geothermal heat) and transfer it to indoor heating; the heat dissipation module 11 is responsible for transferring heat to the indoor space. In the cooling mode, the heat pump unit 10 is used to absorb heat from the indoor space and discharge it to the outdoors to achieve indoor cooling.

[0070] The water pump module 12 is connected to the heat pump unit 10 and the heat dissipation module 11, and is used to transfer heat between the heat pump unit 10 and the heat dissipation module 11 through water flow;

[0071] The water pump module 12 includes an outflow pipeline 121, a return pipeline 122, a water flow switch 123, a water pump 124 and a first three-way valve 125 arranged in sequence on the outflow pipeline 121, and a second three-way valve 126 arranged on the return pipeline 122; a first port (D) of the first three-way valve 125 is connected to the water pump 124, a second port (F) is connected to the heat dissipation module 11, and a third port (E) is connected to the return pipeline 122 between the heat dissipation module 11 and the second three-way valve 126; a fourth port (A) of the second three-way valve 126 is connected to the heat dissipation module 11, a fifth port (B) is connected to the outflow pipeline 121 between the water flow switch 123 and the heat pump unit 10, and a sixth port (C) is connected to the heat pump unit 10;

[0072] A control module is used to control the switching states of the first three-way valve 125 and the second three-way valve 126 to switch the water flow path in the water pump module 12, and to obtain the switching states of the water flow switch 123 under different water flow paths; and to determine the abnormal water flow position according to the switching states of the water flow switch 123 under different water flow paths.

[0073] The first three-way valve 125 and the second three-way valve 126 may be electronic three-way valves. The control module may control the switch states of the various ports of the first three-way valve 125 and the various ports of the second three-way valve 126 to change the water flow path in the water pump module 12. The water pump module 12 may include a plurality of pipelines, specifically including an outflow pipeline 121, a return pipeline 122, a pipeline in which the third port of the first three-way valve 125 is connected to the return pipeline 122, and a pipeline in which the fifth port of the second three-way valve 126 is connected to the outflow pipeline 121. The water flow path may refer to the path of the pipeline circulating in the water pump module.

[0074] The water flow switch 123 is a device for detecting the state of water flow. It triggers the switch action by sensing the presence or absence of water flow, thereby realizing automatic control. When the water flow is normal, the water flow switch 123 is in the open state; when the water flow is abnormal, the water flow switch 123 is in the open state, so as to judge whether the water flow meets the normal operation requirements of the unit.

[0075] In an embodiment of the present invention, a heat pump heating water system includes a heat pump unit, a heat dissipation module, a water pump module and a control module; the water pump module includes an outflow pipeline, a return pipeline, a water flow switch, a water pump and a first three-way valve sequentially arranged on the outflow pipeline, and a second three-way valve arranged on the return pipeline; the control module is used to control the switch state of the first three-way valve and the second three-way valve to switch the water flow path in the water pump module; the water flow path in the water pump module is switched by adding two three-way valves in the water pump module; the abnormal water flow position is determined according to the switch state of the water flow switch under different water flow paths. This makes it convenient for after-sales personnel to quickly locate the abnormal water flow position, thereby performing maintenance and improving after-sales processing efficiency.

[0076] In some embodiments of the present invention, when the heat pump heating water system operates normally (in heating mode or cooling mode), the first port of the first three-way valve 125 is opened, the second port is opened, and the third port is closed; water flows through the first port and the second port of the first three-way valve 125, and does not pass through the third port. The fourth port of the second three-way valve 126 is opened, the sixth port is opened, and the fifth port is closed. Water flows through the fourth port and the sixth port of the second three-way valve 126, and does not pass through the fifth port.

[0077] When the user finds that the heat pump heating water system is abnormal, the water flow abnormality detection mode of the heat pump heating water system can be turned on. In the water flow abnormality detection mode, the control module is used to control the first port and the third port of the first three-way valve 125 to be opened, and the second port to be closed; control the fourth port and the sixth port of the second three-way valve 126 to be opened, and the fifth port to be closed; after the first time, detect the switch state of the water flow switch; if the water flow switch is detected to be opened, it is determined that the water flow abnormality position is in the heat dissipation module; if the water flow switch is detected to be closed, it is determined that the water flow abnormality position is in the heat pump unit or the water pump module; after determining that the water flow abnormality position is in the heat pump unit or the water pump module, control the first port and the third port of the first three-way valve to be opened, and the second port to be closed; control the fifth port and the sixth port of the second three-way valve to be opened, and the fourth port to be closed; after the second time, detect the switch state of the water flow switch; if the water flow switch is detected to be opened, it is determined that the water flow abnormality position is in the heat pump unit, and if the water flow switch is detected to be closed, it is determined that the water flow abnormality position is in the water pump module.

[0078] like Figure 1 In the embodiment, the fourth port (A) of the second three-way valve is connected to the heat dissipation module, the fifth port (B) is connected to the outflow pipeline between the water flow switch and the heat pump unit, and the sixth port (C) is connected to the heat pump unit; the first port (D) of the first three-way valve is connected to the water pump, the second port (F) is connected to the heat dissipation module, and the third port (E) is connected to the return pipeline between the heat dissipation module and the second three-way valve; first, the A end and the C end of the second three-way valve are connected, and the B end is blocked; the D end and the E end of the first three-way valve are connected, and the F end is blocked. At this time, the water does not flow through the heat dissipation module on the user side, but directly returns to the heat pump unit. Start the water pump module, and detect the on and off of the water flow switch after t1 time. If the water flow switch is detected to be on, it is determined that the water flow on the user side is abnormal; if the water flow switch is detected to be off, it is determined that the water flow on the unit side is abnormal. The water pump stops running. Further water path detection controls the B end and the C end of the second three-way valve to be connected, and the D end and the E end of the first three-way valve to be connected. Start the water pump module and detect the on / off of the water flow switch after t12 time. If the water flow switch is detected to be on, it is determined that the water flow of the heat pump unit is abnormal. If the water flow switch is detected to be off, it is determined that the water flow of the water pump module is abnormal.

[0079] Reference Figure 2, shows a structural diagram of another heat pump heating water system provided by an embodiment of the present invention. In some embodiments of the present invention, the heat pump unit 10 may include: a heat pump pipeline 101, a first heat exchanger 102, a compressor 103, a second heat exchanger 104, and a throttle valve 105 connected by the heat pump pipeline 101; the first heat exchanger 102 may be an air-side heat exchanger, also known as an evaporator, for absorbing ambient heat. The second heat exchanger 104 may be a water-side heat exchanger, also known as a condenser, for releasing heat. The compressor 103 is used to compress the refrigerant. The throttle valve 105 is used to reduce the pressure and temperature of the refrigerant, so that it changes from a high-pressure liquid to a low-pressure liquid.

[0080] In some embodiments of the present invention, the control module is also used to control the first port and the second port of the first three-way valve to be opened, and the third port to be closed in the heating mode; control the fourth port and the sixth port of the second three-way valve to be opened, and the fifth port to be closed; when the water flow switch is disconnected, control the operating frequency of the compressor to be reduced to the first frequency; after the water flow switch is disconnected and a third time has passed, obtain the first pressure value of the compressor; after a fourth time has passed, obtain the second pressure value of the compressor; determine the first pressure temperature according to the first pressure value; determine the second pressure temperature according to the second pressure value; determine the pressure-temperature difference according to the second pressure temperature and the first pressure temperature; and adjust the frequency of the compressor according to the pressure-temperature difference.

[0081] When the heat pump heating water system is running in the heating mode, when it is detected that the water flow switch 123 is disconnected, the heat pump heating water system will report a water flow switch failure. The display panel of the heat pump heating water system can display a water flow failure to remind the user, but the heat pump unit does not stop immediately, but performs the following detection control:

[0082] When the water flow switch is turned off, the compressor operating frequency is controlled to be reduced to the first frequency; wherein the first frequency can be the set minimum frequency. After the water flow switch is turned off and a third time (e.g., 30 seconds) has passed, the first pressure value of the compressor at this time is recorded; according to the first pressure value, the first pressure temperature P is determined n The pressure temperature refers to the saturation temperature corresponding to the exhaust pressure. A pressure sensor can be provided between the compressor and the water-side heat exchanger. After the pressure sensor detects the pressure, the control module can convert it into the saturation temperature corresponding to the pressure. After the fourth time, the second pressure value of the compressor is recorded again, and the second pressure temperature P is determined according to the second pressure value. n+1 In one example, the value range of the fourth time may be 1 to 10 minutes.

[0083] The control module can determine the pressure-temperature difference according to the second pressure-temperature and the first pressure-temperature; determine the target water temperature difference according to the second water temperature difference and the first water temperature difference; and adjust the frequency of the compressor according to the pressure-temperature difference and the target water temperature difference. The purpose of adjusting the compressor frequency is to enable the compressor to operate normally when the water flow is abnormal, so that the operating frequency is not too high, causing the compressor to shut down for protection.

[0084] In some embodiments of the present invention, the control module is used to determine that the operating frequency interval of the compressor is a first frequency interval if the pressure-temperature difference is less than or equal to a first threshold, and determine a candidate operating frequency in the first frequency interval; illustratively, the first threshold may be 0, if P n+1 -P n ≤0, it means that there is a certain amount of water flow in the heat pump heating water system and the compressor can continue to operate at medium and low frequencies. The water flow abnormality is judged to be a slight abnormality, and the upper limit of the compressor operating frequency is H1. In one example, the value range of H1 can be 40-50Hz.

[0085] If the pressure-temperature difference is greater than the first threshold and less than or equal to the second threshold, the operating frequency interval of the compressor is determined to be the second frequency interval, and a candidate operating frequency is determined in the second frequency interval; illustratively, the second threshold may be P, and in one example, the value range of P may be 1 to 5°C; if 0<P n+1 -P n ≤P, it means that there is a small amount of water flowing in the heat pump heating water system, and the compressor can continue to run at a low frequency. The water flow abnormality is judged to be a general abnormality, and the upper limit of the compressor operating frequency is H2. In one example, the value range of H2 is 30-40Hz.

[0086] If the pressure-temperature difference is greater than the second threshold and less than or equal to the third threshold, it is determined that the operating frequency of the compressor is the first frequency; illustratively, the third threshold may be P 上限， P 上限 The value range can be 5~10℃; if P<P n+1 -P n ≤P 上限 , it means that there is a small amount of water flowing in the heat pump heating water system, but the compressor can only be kept running at the lowest frequency, and the water flow abnormality is judged to be moderate.

[0087] If the pressure-temperature difference is greater than a third threshold, the compressor is controlled to stop. n+1 -P n >P 上限 , it means that there is very little or no water flowing in the heat pump heating water system, and the compressor cannot continue to run at a low frequency. The unit shuts down and the water flow abnormality is judged to be a serious abnormality.

[0088] The control module can determine the abnormal water flow according to the pressure-temperature difference, and determine the operating frequency range of the compressor according to the abnormal water flow, so that the compressor can operate in a suitable operating frequency range.

[0089] In some embodiments of the present invention, the control module is also used to obtain the first water inlet temperature and the first water outlet temperature of the second heat exchanger after the water flow switch is disconnected and a third time has passed; obtain the second water inlet temperature and the second water outlet temperature of the second heat exchanger after a fourth time has passed; determine a first water temperature difference based on the first water outlet temperature and the first water inlet temperature; determine a second water temperature difference based on the second water outlet temperature and the second water inlet temperature; determine a target water temperature difference based on the second water temperature difference and the first water temperature difference; and adjust the frequency of the compressor based on the target water temperature difference.

[0090] After the water flow switch is turned off and a third time (e.g., 30 seconds) has passed, the first inlet water temperature T of the second heat exchanger is recorded. 进n and the first outlet water temperature T 出n , calculate the temperature difference △T of the first water inlet and outlet n =T 出n -T 进n After the fourth time, record the second water inlet temperature T again 进n+1 , the second outlet water temperature T 出n+1 , calculate the temperature difference of the second water inlet and outlet △ Tn+1 =T 出n+1 -T 进n+1 In one example, the value range of the fourth time may be 1 to 10 minutes.

[0091] The control module can adjust the frequency of the compressor based on the pressure-temperature difference, and can also further optimize the control of the compressor frequency in combination with the water temperature difference, so that the unit can maintain the best heating output under abnormal water flow conditions and improve user comfort.

[0092] In some embodiments of the present invention, the control module is used to increase the first frequency increase amplitude at the candidate operating frequency if the target water temperature difference is less than or equal to a fourth threshold value; illustratively, the fourth threshold value may be 0. If ΔT n+1 -△T n ≤0, indicating that the inlet and outlet water temperature difference has not increased further, and the compressor can increase the frequency by △H. △H is the frequency increase amplitude of the compressor, and the value range can be 2~5Hz.

[0093] If the target water temperature difference is greater than the fourth threshold and less than or equal to the fifth threshold, the second frequency increase amplitude is increased at the candidate operating frequency; illustratively, the fifth threshold may be T, if 0<△T n+1 -△T n≤T, indicating that the temperature difference between the inlet and outlet water increases slightly, and the compressor frequency increases by 1 / 2△H.

[0094] If the target water temperature difference is greater than the fifth threshold and less than or equal to the sixth threshold, the compressor operating frequency remains unchanged; illustratively, the sixth threshold may be T 上限 , T 上限 The value range can be 3~5℃. n+ 1-△T n ≤T 上限 , indicating that the inlet and outlet water temperature difference increases to a certain limit and the compressor frequency remains unchanged.

[0095] If the target water temperature difference is greater than the sixth threshold, the compressor operating frequency is determined to be the first frequency. n+1 -△T n >T 上限 , indicating that the temperature difference between the inlet and outlet water has risen to the limit value, and the compressor can only run at the lowest frequency.

[0096] In some embodiments of the present invention, the heat pump unit 10 may further include: a pressure sensor 106, connected to the compressor 103, for detecting the pressure value of the compressor 103; a water outlet temperature sensing package 107, connected to the first heat exchanger 104, for detecting the temperature of the water flowing out of the first heat exchanger 104; and a water inlet temperature sensing package 108, connected to the first heat exchanger 104, for detecting the temperature of the water flowing into the first heat exchanger 104.

[0097] In some embodiments of the present invention, the control module is also used to control the first port and the second port of the first three-way valve to be opened, and the third port to be closed in the cooling mode; control the fourth port and the sixth port of the second three-way valve to be opened, and the fifth port to be closed; and control the heat pump unit to be shut down when the water flow switch is disconnected.

[0098] When the heat pump heating water system is in cooling operation, it is detected that the water flow switch is disconnected, the heat pump unit reports a water flow switch failure, and the heat pump unit shuts down. Since the heat pump unit discharges cold water in cooling mode, if the water flow is abnormal, if the heat pump unit continues to operate, it is easy to freeze the water side heat exchanger. Therefore, when the water flow is abnormal during cooling operation, the heat pump unit must shut down.

[0099] Reference Figure 3 , shows a flow chart of steps of a control method of a heat pump heating water system provided by an embodiment of the present invention, and the method may specifically include:

[0100] Step 301, controlling the switch states of the first three-way valve and the second three-way valve to switch the water flow path in the water pump module;

[0101] Step 302, obtaining the switch status of the water flow switch under different water flow paths;

[0102] Step 303, determining the abnormal water flow position according to the switch state of the water flow switch under different water flow paths.

[0103] In some embodiments of the present invention, step 303 may include:

[0104] Control the first port and the third port of the first three-way valve to be opened, and the second port to be closed; control the fourth port and the sixth port of the second three-way valve to be opened, and the fifth port to be closed;

[0105] After the first time has passed, the switch state of the water flow switch is detected; if it is detected that the water flow switch is turned on, it is determined that the abnormal water flow position is in the heat dissipation module; if it is detected that the water flow switch is turned off, it is determined that the abnormal water flow position is in the heat pump unit or the water pump module;

[0106] After determining that the abnormal water flow position is in the heat pump unit or the water pump module, control the first port and the third port of the first three-way valve to be opened, and the second port to be closed; control the fifth port and the sixth port of the second three-way valve to be opened, and the fourth port to be closed; after a second time has passed, detect the switching state of the water flow switch; if it is detected that the water flow switch is opened, determine that the abnormal water flow position is in the heat pump unit, and if it is detected that the water flow switch is closed, determine that the abnormal water flow position is in the water pump module.

[0107] In some embodiments of the present invention, the method may further include:

[0108] In the heating mode, the first port and the second port of the first three-way valve are controlled to be opened, and the third port is controlled to be closed; the fourth port and the sixth port of the second three-way valve are controlled to be opened, and the fifth port is controlled to be closed;

[0109] When the water flow switch is disconnected, controlling the operating frequency of the compressor to decrease to a first frequency;

[0110] After the water flow switch is turned off and a third time has passed, obtaining a first pressure value of the compressor;

[0111] After a fourth time has passed, obtaining a second pressure value of the compressor;

[0112] determining a first pressure temperature according to the first pressure value;

[0113] determining a second pressure temperature according to the second pressure value;

[0114] determining a pressure-temperature difference according to the second pressure-temperature and the first pressure-temperature;

[0115] The frequency of the compressor is adjusted according to the pressure-temperature difference.

[0116] In some embodiments of the present invention, the step of adjusting the frequency of the compressor according to the pressure-temperature difference may further include:

[0117] If the pressure-temperature difference is less than or equal to a first threshold, determining that the operating frequency interval of the compressor is a first frequency interval, and determining a candidate operating frequency in the first frequency interval;

[0118] If the pressure-temperature difference is greater than a first threshold and less than or equal to a second threshold, determining that the operating frequency interval of the compressor is a second frequency interval, and determining a candidate operating frequency in the second frequency interval;

[0119] If the pressure-temperature difference is greater than a second threshold value and less than or equal to a third threshold value, determining that the operating frequency of the compressor is a first frequency;

[0120] If the pressure-temperature difference is greater than a third threshold, the compressor is controlled to stop.

[0121] In some embodiments of the present invention, the method may further include:

[0122] After the water flow switch is turned off and a third time has passed, obtaining a first water inlet temperature and a first water outlet temperature of the second heat exchanger;

[0123] After a fourth time has passed, obtaining a second water inlet temperature and a second water outlet temperature of the second heat exchanger;

[0124] Determining a first water temperature difference according to the first water outlet temperature and the first water inlet temperature;

[0125] determining a second water temperature difference according to the second water outlet temperature and the second water inlet temperature;

[0126] determining a target water temperature difference according to the second water temperature difference and the first water temperature difference;

[0127] The frequency of the compressor is adjusted according to the target water temperature difference.

[0128] In some embodiments of the present invention, the step of adjusting the frequency of the compressor according to the target water temperature difference may include:

[0129] If the target water temperature difference is less than or equal to a fourth threshold, increasing the first frequency increase amplitude at the candidate operating frequency;

[0130] If the target water temperature difference is greater than a fourth threshold and less than or equal to a fifth threshold, increasing the second frequency increase amplitude at the candidate operating frequency;

[0131] If the target water temperature difference is greater than the fifth threshold value and less than or equal to the sixth threshold value, the compressor operating frequency remains unchanged;

[0132] If the target water temperature difference is greater than a sixth threshold, the compressor operating frequency is determined to be the first frequency.

[0133] In some embodiments of the present invention, the method may further include:

[0134] In the cooling mode, the first port and the second port of the first three-way valve are controlled to be opened, and the third port is controlled to be closed; the fourth port and the sixth port of the second three-way valve are controlled to be opened, and the fifth port is controlled to be closed;

[0135] When the water flow switch is disconnected, the heat pump unit is controlled to shut down.

[0136] In an embodiment of the present invention, a heat pump heating water system includes a heat pump unit, a heat dissipation module, a water pump module and a control module; the water pump module includes an outflow pipeline, a return pipeline, a water flow switch, a water pump and a first three-way valve sequentially arranged on the outflow pipeline, and a second three-way valve arranged on the return pipeline; the control module is used to control the switch state of the first three-way valve and the second three-way valve to switch the water flow path in the water pump module; the water flow path in the water pump module is switched by adding two three-way valves in the water pump module; the abnormal water flow position is determined according to the switch state of the water flow switch under different water flow paths. This makes it convenient for after-sales personnel to quickly locate the abnormal water flow position, thereby performing maintenance and improving after-sales processing efficiency.

[0137] It should be noted that, for the sake of simplicity, the method embodiments are described as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present invention are not limited by the order of the actions described, because according to the embodiments of the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

[0138] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0139] It will be appreciated by those skilled in the art that the embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the embodiments of the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0140] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0141] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0142] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable terminal device. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0143] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0144] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0145] The heat pump heating water system and the control method of the heat pump heating water system provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A heat pump heating water system, characterized in that: include: Heat pump unit, cooling module, water pump module and control module; The water pump module is connected to the heat pump unit and the heat dissipation module, and is used to transfer heat between the heat pump unit and the heat dissipation module through water flow; The water pump module includes an outflow pipeline, a return pipeline, a water flow switch, a water pump and a first three-way valve arranged on the outflow pipeline in sequence, and a second three-way valve arranged on the return pipeline; a first port of the first three-way valve is connected to the water pump, a second port is connected to the heat dissipation module, and a third port is connected to the return pipeline between the heat dissipation module and the second three-way valve; a fourth port of the second three-way valve is connected to the heat dissipation module, a fifth port is connected to the outflow pipeline between the water flow switch and the heat pump unit, and a sixth port is connected to the heat pump unit; A control module, used to control the switch states of the first three-way valve and the second three-way valve to switch the water flow path in the water pump module, and to obtain the switch states of the water flow switch under different water flow paths; The abnormal water flow position is determined according to the switch state of the water flow switch under different water flow paths.

2. The system according to claim 1, characterized in that The control module is used to control the first port and the third port of the first three-way valve to be opened, and the second port to be closed; control the fourth port and the sixth port of the second three-way valve to be opened, and the fifth port to be closed; and detect the switch state of the water flow switch after a first time has passed; If it is detected that the water flow switch is turned on, it is determined that the abnormal water flow position is in the heat dissipation module; if it is detected that the water flow switch is turned off, it is determined that the abnormal water flow position is in the heat pump unit or the water pump module; After determining that the abnormal water flow position is in the heat pump unit or the water pump module, controlling the first port and the third port of the first three-way valve to be opened, and the second port to be closed; controlling the fifth port and the sixth port of the second three-way valve to be opened, and the fourth port to be closed; after a second time has passed, detecting the switch state of the water flow switch; If it is detected that the water flow switch is turned on, it is determined that the abnormal water flow position is in the heat pump unit; if it is detected that the water flow switch is turned off, it is determined that the abnormal water flow position is in the water pump module.

3. The system according to claim 1, characterized in that The heat pump unit comprises: a heat pump pipeline, a first heat exchanger, a compressor, a second heat exchanger, and a throttle valve connected through the heat pump pipeline; The control module is also used to control the first port and the second port of the first three-way valve to be opened and the third port to be closed in the heating mode; control the fourth port and the sixth port of the second three-way valve to be opened and the fifth port to be closed; when the water flow switch is disconnected, control the operating frequency of the compressor to be reduced to the first frequency; after the water flow switch is disconnected and a third time has passed, obtain the first pressure value of the compressor; after a fourth time has passed, obtain the second pressure value of the compressor; determine the first pressure temperature according to the first pressure value; determine the second pressure temperature according to the second pressure value; determine the pressure-temperature difference according to the second pressure temperature and the first pressure temperature; and adjust the frequency of the compressor according to the pressure-temperature difference.

4. The system according to claim 3, characterized in that The control module is used to determine that the operating frequency interval of the compressor is a first frequency interval if the pressure-temperature difference is less than or equal to a first threshold, and determine a candidate operating frequency in the first frequency interval; if the pressure-temperature difference is greater than the first threshold and less than or equal to a second threshold, determine that the operating frequency interval of the compressor is a second frequency interval, and determine a candidate operating frequency in the second frequency interval; if the pressure-temperature difference is greater than the second threshold and less than or equal to a third threshold, determine that the operating frequency of the compressor is the first frequency; if the pressure-temperature difference is greater than the third threshold, control the compressor to stop.

5. The system according to claim 4, characterized in that The control module is further configured to obtain a first water inlet temperature and a first water outlet temperature of the second heat exchanger after a third time has passed since the water flow switch was turned off; obtain a second water inlet temperature and a second water outlet temperature of the second heat exchanger after a fourth time has passed; and determine a first water temperature difference according to the first water outlet temperature and the first water inlet temperature; determining a second water temperature difference according to the second water outlet temperature and the second water inlet temperature; determining a target water temperature difference according to the second water temperature difference and the first water temperature difference; The frequency of the compressor is adjusted according to the target water temperature difference.

6. The system according to claim 5, characterized in that The control module is configured to increase the first frequency increase amplitude at the candidate operating frequency if the target water temperature difference is less than or equal to a fourth threshold; increase the second frequency increase amplitude at the candidate operating frequency if the target water temperature difference is greater than the fourth threshold and less than or equal to a fifth threshold; and keep the compressor operating frequency unchanged if the target water temperature difference is greater than the fifth threshold and less than or equal to a sixth threshold; If the target water temperature difference is greater than a sixth threshold, the compressor operating frequency is determined to be the first frequency.

7. The system according to claim 1, characterized in that The control module is also used to control the first port and the second port of the first three-way valve to be opened and the third port to be closed in the cooling mode; control the fourth port and the sixth port of the second three-way valve to be opened and the fifth port to be closed; and control the heat pump unit to be shut down when the water flow switch is disconnected.

8. The system according to claim 5, characterized in that The heat pump unit also includes: A pressure sensor, connected to the compressor, for detecting a pressure value of the compressor; An outlet water temperature sensing package, connected to the first heat exchanger, and used to detect the temperature of the water flowing out of the first heat exchanger; The water inlet temperature sensing package is connected to the first heat exchanger and is used to detect the temperature of the water flow entering the first heat exchanger.

9. A control method for a heat pump heating water system, characterized in that: Applicable to the heat pump heating water system described in any one of claims 1 to 8, the method comprising: Controlling the switch states of the first three-way valve and the second three-way valve to switch the water flow path in the water pump module; Acquiring the switch state of the water flow switch under different water flow paths; The abnormal water flow position is determined according to the switch state of the water flow switch under different water flow paths.

10. The method according to claim 9, characterized in that The method of determining the abnormal water flow position according to the switch state of the water flow switch under different water flow paths includes: Control the first port and the third port of the first three-way valve to be opened, and the second port to be closed; control the fourth port and the sixth port of the second three-way valve to be opened, and the fifth port to be closed; After the first time has passed, the switch state of the water flow switch is detected; if it is detected that the water flow switch is turned on, it is determined that the abnormal water flow position is in the heat dissipation module; if it is detected that the water flow switch is turned off, it is determined that the abnormal water flow position is in the heat pump unit or the water pump module; After determining that the abnormal water flow position is in the heat pump unit or the water pump module, control the first port and the third port of the first three-way valve to be opened, and the second port to be closed; control the fifth port and the sixth port of the second three-way valve to be opened, and the fourth port to be closed; after a second time has passed, detect the switching state of the water flow switch; if it is detected that the water flow switch is opened, determine that the abnormal water flow position is in the heat pump unit, and if it is detected that the water flow switch is closed, determine that the abnormal water flow position is in the water pump module.

11. The method according to claim 9, characterized in that Also includes: In the heating mode, the first port and the second port of the first three-way valve are controlled to be opened, and the third port is controlled to be closed; the fourth port and the sixth port of the second three-way valve are controlled to be opened, and the fifth port is controlled to be closed; When the water flow switch is disconnected, controlling the operating frequency of the compressor to decrease to a first frequency; After the water flow switch is turned off and a third time has passed, obtaining a first pressure value of the compressor; After a fourth time has passed, obtaining a second pressure value of the compressor; determining a first pressure temperature according to the first pressure value; determining a second pressure temperature according to the second pressure value; determining a pressure-temperature difference according to the second pressure-temperature and the first pressure-temperature; The frequency of the compressor is adjusted according to the pressure-temperature difference.

12. The method according to claim 11, characterized in that The step of adjusting the frequency of the compressor according to the pressure-temperature difference comprises: If the pressure-temperature difference is less than or equal to a first threshold, determining that the operating frequency interval of the compressor is a first frequency interval, and determining a candidate operating frequency in the first frequency interval; If the pressure-temperature difference is greater than a first threshold and less than or equal to a second threshold, determining that the operating frequency interval of the compressor is a second frequency interval, and determining a candidate operating frequency in the second frequency interval; If the pressure-temperature difference is greater than a second threshold value and less than or equal to a third threshold value, determining that the operating frequency of the compressor is a first frequency; If the pressure-temperature difference is greater than a third threshold, the compressor is controlled to stop.

13. The method according to claim 12, characterized in that Also includes: After the water flow switch is turned off and a third time has passed, obtaining a first water inlet temperature and a first water outlet temperature of the second heat exchanger; After a fourth time has passed, obtaining a second water inlet temperature and a second water outlet temperature of the second heat exchanger; Determining a first water temperature difference according to the first water outlet temperature and the first water inlet temperature; determining a second water temperature difference according to the second water outlet temperature and the second water inlet temperature; determining a target water temperature difference according to the second water temperature difference and the first water temperature difference; The frequency of the compressor is adjusted according to the target water temperature difference.

14. The method according to claim 13, characterized in that The step of adjusting the frequency of the compressor according to the target water temperature difference comprises: If the target water temperature difference is less than or equal to a fourth threshold, increasing the first frequency increase amplitude at the candidate operating frequency; If the target water temperature difference is greater than a fourth threshold and less than or equal to a fifth threshold, increasing the second frequency increase amplitude at the candidate operating frequency; If the target water temperature difference is greater than the fifth threshold value and less than or equal to the sixth threshold value, the compressor operating frequency remains unchanged; If the target water temperature difference is greater than a sixth threshold, the compressor operating frequency is determined to be the first frequency.

15. The method according to claim 9, characterized in that Also includes: In the cooling mode, the first port and the second port of the first three-way valve are controlled to be opened, and the third port is controlled to be closed; the fourth port and the sixth port of the second three-way valve are controlled to be opened, and the fifth port is controlled to be closed; When the water flow switch is disconnected, the heat pump unit is controlled to shut down.

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