Control method and control device of heat pump unit and heat pump unit

Abstract

The invention provides a control method and device of a heat pump unit and the heat pump unit. The control method of the heat pump unit comprises the steps that the current working mode of the heat pump unit is obtained; a signal indicating that the heat pump unit is in the specific working mode is received, and the water inlet temperature and the water outlet temperature of a water-fluorine heat exchanger in the heat pump unit are obtained; and according to a specific working mode, the water inlet temperature and the water outlet temperature, first execution logic is generated, and working parameters of the heat pump unit are adjusted according to the first execution logic. According to the control method and device of the heat pump unit and the heat pump unit, the water-fluorine heat exchanger can be prevented from frost cracking during operation, normal operation of the water-fluorine heat exchanger is guaranteed, then normal operation of the heat pump unit is guaranteed, the use safety of the heat pump unit is improved, and the service life of the heat pump unit is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and in particular to a control method and a control device for a heat pump unit and a heat pump unit. Background Art

[0002] In the related technology, with the expansion of the current heat pump water heater market and the popularization of products, the reliability of its water-fluorine heat exchange unit has attracted much attention. As more and more variable frequency water pumps are installed in the current system, users can adjust the water pump speed by themselves. When the hot water unit is heating at a low outdoor ambient temperature, it needs to be defrosted. If the water pump speed is improperly set or the inlet and outlet water temperature protection fails during the defrosting process, it is very likely to cause the water-fluorine heat exchange unit in the hot water unit to freeze and crack. Similarly, under refrigeration conditions, in order to prevent the water pump speed from being improperly set or the inlet and outlet water temperature protection from failing, when the water pump speed is too low, it may also cause the water-fluorine heat exchange unit to freeze and crack. Summary of the invention

[0003] The present invention provides a control method, a control device and a heat pump unit for a heat pump unit, which are used to solve the defects in the prior art and achieve the following technical effects: avoiding the freezing and cracking failure of a water-fluorine heat exchanger during operation, ensuring the normal operation of the water-fluorine heat exchanger, and then ensuring the normal operation of the heat pump unit, thereby improving the safety of use and the service life of the heat pump unit.

[0004] A control method for a heat pump unit according to a first embodiment of the present invention includes:

[0005] Get the current working mode of the heat pump unit;

[0006] Receiving a signal that the heat pump unit is in a specific working mode, obtaining the water inlet temperature and the water outlet temperature of the water-fluorine heat exchanger in the heat pump unit;

[0007] A first execution logic is generated according to a specific working mode, the water inlet temperature and the water outlet temperature, and the working parameters of the heat pump unit are adjusted according to the first execution logic.

[0008] According to one embodiment of the present invention, in the step of receiving a signal that the heat pump unit is in a specific working mode and obtaining the inlet water temperature and the outlet water temperature of the water-fluorine heat exchanger in the heat pump unit, the specific working mode includes a defrost mode and a refrigeration mode.

[0009] According to an embodiment of the present invention, the step of generating a first execution logic according to the specific working mode, the water inlet temperature and the water outlet temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic specifically includes:

[0010] Determining whether the heat pump unit is in a cooling mode or a defrosting mode;

[0011] The rotation speed of the water pump is adjusted according to the interval range of the minimum value of the water inlet temperature and the water outlet temperature, wherein the water pump is installed on the water inlet pipeline or the water outlet pipeline of the water-fluorine heat exchanger.

[0012] According to an embodiment of the present invention, the step of adjusting the rotation speed of the water pump according to the interval range of the minimum value of the water inlet temperature and the water outlet temperature specifically includes:

[0013] According to the minimum value of the water inlet temperature and the water outlet temperature being in the first temperature range, adjusting the rotation speed of the water pump to a first rotation speed;

[0014] According to the minimum value of the water inlet temperature and the water outlet temperature being in the second temperature range, adjusting the rotation speed of the water pump to a second rotation speed;

[0015] According to the minimum value of the water inlet temperature and the water outlet temperature being in the third temperature range, adjusting the rotation speed of the water pump to the maximum rotation speed;

[0016] The first temperature range is greater than the second temperature range, the second temperature range is greater than the third temperature range, the first rotational speed is less than the second rotational speed, and the second rotational speed is less than the maximum rotational speed.

[0017] According to an embodiment of the present invention, the step of generating a first execution logic according to the specific working mode, the water inlet temperature and the water outlet temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic specifically includes:

[0018] Determining whether the heat pump unit is in a cooling mode or a defrosting mode;

[0019] The operating frequency of the compressor is adjusted according to the interval range of the minimum value between the inlet water temperature and the outlet water temperature.

[0020] According to an embodiment of the present invention, the step of adjusting the operating frequency of the compressor according to the interval range of the minimum value of the water inlet temperature and the water outlet temperature includes:

[0021] According to the minimum value between the water inlet temperature and the water outlet temperature being in the first temperature range, adjusting the operating frequency of the compressor to a first frequency;

[0022] According to the minimum value between the water inlet temperature and the water outlet temperature being in the second temperature range, adjusting the operating frequency of the compressor to the first frequency;

[0023] According to the minimum value of the water inlet temperature and the water outlet temperature being in the third temperature range, adjusting the operating frequency of the compressor to the lowest frequency in the cooling mode or the defrosting mode;

[0024] The first temperature range is greater than the second temperature range, the second temperature range is greater than the third temperature range, the first frequency is greater than the second frequency, and the second frequency is greater than the minimum frequency.

[0025] According to one embodiment of the present invention, a heating pipe is led out of the outdoor heat exchanger to the water-fluorine heat exchanger, and a first control valve is provided on the heating pipe;

[0026] The step of generating a first execution logic according to the specific working mode, the water inlet temperature and the water outlet temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic specifically includes:

[0027] Determining whether the heat pump unit is in a cooling mode or a defrosting mode;

[0028] According to the minimum value of the inlet water temperature and the outlet water temperature being less than the set minimum temperature, the first control valve is controlled to open, and the opening of the first control valve is adjusted according to the interval range of the minimum value of the inlet water temperature and the outlet water temperature.

[0029] According to one embodiment of the present invention, a waste heat collection device is provided at the compressor, and the waste heat collection device exchanges heat with the water-fluorine heat exchanger through a heat exchange pipeline, and a second control valve is provided on the heat exchange pipeline;

[0030] The step of generating a first execution logic according to the specific working mode, the water inlet temperature and the water outlet temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic specifically includes:

[0031] Determining whether the heat pump unit is in a cooling mode or a defrosting mode;

[0032] According to the minimum value of the inlet water temperature and the outlet water temperature being less than the set temperature, the second control valve is controlled to open, and the opening of the second control valve is adjusted according to the interval range of the minimum value of the inlet water temperature and the outlet water temperature.

[0033] According to an embodiment of the present invention, the step of generating a first execution logic according to the specific working mode, the water inlet temperature and the water outlet temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic further includes:

[0034] Determining whether the heat pump unit is in a cooling mode or a defrosting mode;

[0035] According to the minimum value of the water inlet temperature and the water outlet temperature being less than the alarm temperature, the compressor is controlled to stop, and the air conditioning system is controlled to issue an alarm.

[0036] A control device for a heat pump unit according to an embodiment of the second aspect of the present invention comprises:

[0037] The first acquisition module is used to acquire the current working mode of the heat pump unit;

[0038] A second acquisition module is used to receive a signal that the heat pump unit is in a specific working mode, and obtain the inlet water temperature and the outlet water temperature of the water-fluorine heat exchanger in the heat pump unit;

[0039] The control module is used to generate a first execution logic according to a specific working mode, the water inlet temperature and the water outlet temperature, and adjust the working parameters of the heat pump unit according to the first execution logic.

[0040] According to an embodiment of the third aspect of the present invention, a heat pump unit includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the control method of the heat pump unit as described in the embodiment of the first aspect of the present invention is implemented.

[0041] Therefore, in order to avoid the technical defects existing in the above-mentioned related technologies, the present invention provides a control method for a heat pump unit. The method can determine whether the current water-fluorine heat exchanger has the risk of freezing and cracking by analyzing the inlet water temperature and the outlet water temperature of the water-fluorine heat exchanger under the specific working mode of the heat pump unit, and further determine the specific magnitude of the risk of freezing and cracking after determining that it has the risk of freezing and cracking. Subsequently, the adjustment strategy for the heat pump unit is determined according to the above results, and the parameters of the heat pump unit are adjusted based on the above adjustment strategy, so as to avoid the water-fluorine heat exchanger from freezing and cracking during operation, ensure the normal operation of the water-fluorine heat exchanger, and then ensure the normal operation of the heat pump unit, thereby improving the safety and service life of the heat pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 It is a schematic diagram of the steps of the control method of the heat pump unit provided by the present invention;

[0044] Figure 2 It is a structural schematic diagram of a control device for a heat pump unit provided by the present invention;

[0045] Figure 3 It is a structural schematic diagram of the heat pump unit provided by the present invention;

[0046] Figure 4 It is a structural schematic diagram of the electronic device provided by the present invention.

[0047] Reference numerals:

[0048] 1. Compressor; 2. Four-way valve; 3. Outdoor heat exchanger; 4. Electronic expansion valve; 5. Water-fluorine heat exchanger; 6. Water pump; 110. First acquisition module; 120. Second acquisition module; 130. Control module. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The control method, control device and heat pump unit of the heat pump unit proposed in the present invention are described below with reference to the accompanying drawings. Among them, before the embodiment of the present invention is described in detail, the entire application scenario is first described. The control method, control device, electronic device and computer-readable storage medium of the heat pump unit of the embodiment of the present invention can be applied to the air conditioner locally, and can also be applied to the cloud platform in the Internet field, or other types of cloud platforms in the Internet field, or can also be applied to third-party devices. Among them, the third-party device may include many different types such as mobile phones, tablet computers, notebooks, car computers and other smart terminals.

[0051] The following description will only take the control method applicable to a heat pump unit as an example. It should be understood that the control method of the embodiment of the present invention can also be applied to a cloud platform and third-party equipment.

[0052] like Figure 1 As shown, a control method for a heat pump unit according to a first embodiment of the present invention includes:

[0053] Step S1, obtaining the current working mode of the heat pump unit;

[0054] Step S2, receiving a signal indicating that the heat pump unit is in a specific working mode, and obtaining the inlet water temperature and outlet water temperature of the water-fluorine heat exchanger 5 in the heat pump unit;

[0055] Step S3, generating a first execution logic according to the specific working mode, the water inlet temperature and the water outlet temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic.

[0056] According to the control method of the heat pump unit according to the embodiment of the present invention, its specific working process is as follows: after the heat pump unit is started and operated, the controller obtains the current working mode of the heat pump unit. When it is determined that the heat pump unit is in a specific operating mode, for example, the controller receives a signal that the heat pump unit is in a defrost mode or a refrigeration mode. At this time, during the defrost process and the refrigeration process, the water-fluorine heat exchanger 5 acts as an evaporator to cool the water flow circulating inside. When the temperature of the water-fluorine heat exchanger 5 is too low, the water flow inside the water-fluorine heat exchanger 5 may freeze, thereby causing a freezing and cracking failure of the water-fluorine heat exchanger 5. Therefore, in order to avoid freezing and cracking of the water-fluorine heat exchanger 5 during use, the controller will obtain the inlet water temperature and outlet water temperature of the water-fluorine heat exchanger 5 after determining that the heat pump unit is in a specific working mode. The above-mentioned inlet water temperature and outlet water temperature can reflect the temperature condition of the water-fluorine heat exchanger 5.

[0057] Furthermore, the controller will adjust the working parameters of the heat pump unit in the current working mode according to the temperature of the water-fluorine heat exchanger 5. For example, when the heat pump unit is in cooling mode or defrost mode, if the inlet water temperature and outlet water temperature of the water-fluorine heat exchanger 5 meet the set conditions, it means that the water-fluorine heat exchanger 5 is at risk of freezing and cracking. Therefore, the controller will take measures such as controlling the water flow rate to increase and the frequency of the compressor 1 to avoid the temperature of the water-fluorine heat exchanger 5 being too low, thereby avoiding the water-fluorine heat exchanger 5 from freezing and cracking.

[0058] In the related technology, with the expansion of the current heat pump water heater market and the popularization of products, the reliability of its water-fluorine heat exchange unit has attracted much attention. As more and more variable frequency water pumps are installed in the current system, users can adjust the water pump speed by themselves. When the hot water unit is heating at a low outdoor ambient temperature, it needs to be defrosted. If the water pump speed is improperly set or the inlet and outlet water temperature protection fails during the defrosting process, it is very likely to cause the water-fluorine heat exchange unit in the hot water unit to freeze and crack. Similarly, under refrigeration conditions, in order to prevent the water pump speed from being improperly set or the inlet and outlet water temperature protection from failing, when the water pump speed is too low, it may also cause the water-fluorine heat exchange unit to freeze and crack.

[0059] Therefore, in order to avoid the technical defects existing in the above-mentioned related technologies, the present invention provides a control method for a heat pump unit. The method can determine whether the current water-fluorine heat exchanger 5 has the risk of freezing and cracking by analyzing the inlet water temperature and the outlet water temperature of the water-fluorine heat exchanger 5 under the specific working mode of the heat pump unit, and further determine the specific size of the risk of freezing and cracking after determining that it has the risk of freezing and cracking. Subsequently, the adjustment strategy for the heat pump unit is determined according to the above results, and the parameters of the heat pump unit are adjusted based on the above adjustment strategy, so as to avoid the water-fluorine heat exchanger 5 from freezing and cracking during operation, ensure the normal operation of the water-fluorine heat exchanger 5, and then ensure the normal operation of the heat pump unit, thereby improving the safety and service life of the heat pump unit.

[0060] According to some embodiments of the present invention, in the step of receiving a signal indicating that the heat pump unit is in a specific operating mode and obtaining the inlet water temperature and outlet water temperature of the water-fluorine heat exchanger 5 in the heat pump unit, the specific operating mode includes a defrost mode and a refrigeration mode.

[0061] It can be understood that since the water-fluorine heat exchanger 5 acts as an evaporator to cool the water flowing inside the water-fluorine heat exchanger 5 in the defrost mode and the refrigeration mode, when the temperature of the water-fluorine heat exchanger 5 is too low, the water flowing inside the water-fluorine heat exchanger 5 is at risk of freezing. The increase in the volume of the condensed ice will squeeze the water pipe wall of the water-fluorine heat exchanger 5. When too much ice is condensed, the water pipe wall of the water-fluorine heat exchanger 5 will be squeezed to crack. Therefore, the lower the temperature of the water-fluorine heat exchanger 5, the higher the risk of freezing and cracking. Therefore, in the defrost mode and the refrigeration mode, the water inlet temperature and the outlet temperature of the water-fluorine heat exchanger 5 need to be analyzed to know the temperature of the water-fluorine heat exchanger 5 and further judge the risk of freezing and cracking of the water-fluorine heat exchanger 5.

[0062] According to some embodiments of the present invention, the step of generating a first execution logic according to a specific working mode, an inlet water temperature and an outlet water temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic specifically includes:

[0063] Make sure the heat pump unit is in cooling mode or defrost mode;

[0064] The rotation speed of the water pump 6 is adjusted according to the interval range of the minimum value of the inlet water temperature and the outlet water temperature, wherein the water pump 6 is installed on the inlet pipe or the outlet pipe of the water-fluorine heat exchanger 5 .

[0065] In this embodiment, the minimum value of the water inlet temperature and the water outlet temperature can represent the temperature condition of the water-fluorine heat exchanger 5 under the refrigeration condition. Generally speaking, due to the refrigeration of the water-fluorine heat exchanger 5, its minimum value is usually the water outlet temperature value. When the water outlet temperature value is too low, it proves that the risk of water flow freezing is relatively high. At this time, the risk of freezing and cracking of the water-fluorine heat exchanger 5 is also relatively high. Therefore, the controller can increase the water flow rate in the water-fluorine heat exchanger 5 by controlling the speed of the water pump 6.

[0066] It can be understood that when the defrosting capacity or refrigeration capacity of the heat pump unit is constant, the temperature difference between the inlet water temperature and the outlet water temperature will decrease due to the increase in water flow rate. That is, when the inlet water temperature is constant, the outlet water temperature value will increase with the increase in water flow rate. At this time, the risk of freezing and cracking of the water-fluorine heat exchanger 5 will also be reduced.

[0067] In this way, by adjusting the rotation speed of the water pump 6, the water flow rate in the water-fluorine heat exchanger 5 can be adjusted, so that the risk of freezing and cracking of the heat exchanger can be reduced by increasing the water flow rate.

[0068] In some specific embodiments of the present invention, the step of adjusting the rotation speed of the water pump 6 according to the interval range of the minimum value of the inlet water temperature and the outlet water temperature specifically includes:

[0069] According to the minimum value of the water inlet temperature and the water outlet temperature being in the first temperature range, adjusting the rotation speed of the water pump 6 to the first rotation speed;

[0070] According to the minimum value of the water inlet temperature and the water outlet temperature being in the second temperature range, adjusting the rotation speed of the water pump 6 to the second rotation speed;

[0071] According to the minimum value of the water inlet temperature and the water outlet temperature being in the third temperature interval, the rotation speed of the water pump 6 is adjusted to the maximum rotation speed.

[0072] The first temperature range is greater than the second temperature range, the second temperature range is greater than the third temperature range, the first rotational speed is less than the second rotational speed, and the second rotational speed is less than the maximum rotational speed.

[0073] In the above embodiment, the smaller the minimum value of the water inlet temperature and the water outlet temperature is, the greater the risk of freezing and cracking of the water-fluorine heat exchanger 5 is, and therefore the controller controls the speed increase of the water pump 6 to a greater extent.

[0074] According to some other embodiments of the present invention, the steps of generating a first execution logic according to a specific working mode, an inlet water temperature and an outlet water temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic specifically include:

[0075] Make sure the heat pump unit is in cooling mode or defrost mode;

[0076] The operating frequency of the compressor 1 is adjusted according to the interval range of the minimum value of the inlet water temperature and the outlet water temperature.

[0077] In this embodiment, the minimum value of the water inlet temperature and the water outlet temperature can represent the temperature condition of the water-fluorine heat exchanger 5 under the refrigeration condition. Generally speaking, due to the refrigeration of the water-fluorine heat exchanger 5, its minimum value is usually the water outlet temperature value. When the water outlet temperature value is too low, it proves that the risk of water flow freezing is relatively high. At this time, the risk of freezing and cracking of the water-fluorine heat exchanger 5 is also relatively high. Therefore, the controller can reduce the refrigeration capacity of the water-fluorine heat exchanger 5 by controlling the operating frequency of the compressor 1 to decrease.

[0078] It can be understood that when the water flow rate in the water-fluorine heat exchanger 5 is constant, the temperature difference between the water inlet temperature and the water outlet temperature will decrease due to the reduction in cooling capacity. That is, when the water inlet temperature is constant, the water outlet temperature value will increase with the decrease in cooling capacity. At this time, the risk of freezing and cracking of the water-fluorine heat exchanger 5 will also be reduced.

[0079] In this way, by adjusting the operating frequency of the compressor 1, the cooling capacity of the water-fluorine heat exchanger 5 can be adjusted, so that the risk of freezing and cracking of the heat exchanger can be reduced by reducing the cooling capacity.

[0080] In some specific embodiments of the present invention, the step of adjusting the operating frequency of the compressor 1 according to the interval range of the minimum value of the inlet water temperature and the outlet water temperature includes:

[0081] According to the minimum value of the water inlet temperature and the water outlet temperature being in the first temperature range, adjusting the operating frequency of the compressor 1 to the first frequency;

[0082] According to the minimum value of the water inlet temperature and the water outlet temperature being in the second temperature range, adjusting the operating frequency of the compressor 1 to the first frequency;

[0083] According to the minimum value of the water inlet temperature and the water outlet temperature being in the third temperature interval, the operating frequency of the compressor 1 is adjusted to the lowest frequency in the refrigeration mode or the defrosting mode.

[0084] The first temperature range is greater than the second temperature range, the second temperature range is greater than the third temperature range, the first frequency is greater than the second frequency, and the second frequency is greater than the minimum frequency.

[0085] In the above embodiment, the smaller the minimum value of the water inlet temperature and the water outlet temperature is, the greater the risk of freezing and cracking of the water-fluorine heat exchanger 5 is, and therefore the controller controls the operating frequency of the compressor 1 to be reduced to a greater extent.

[0086] According to some embodiments of the present invention, a heating pipe is led out from the outdoor heat exchanger 3 to the water-fluorine heat exchanger 5, and a first control valve is provided on the heating pipe.

[0087] The steps of generating a first execution logic according to a specific working mode, an inlet water temperature and an outlet water temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic specifically include:

[0088] Make sure the heat pump unit is in cooling mode or defrost mode;

[0089] According to the minimum value of the inlet water temperature and the outlet water temperature being less than the set minimum temperature, the first control valve is controlled to open, and the opening of the first control valve is adjusted according to the interval range of the minimum value of the inlet water temperature and the outlet water temperature.

[0090] In this way, when the water-fluorine heat exchanger 5 is at risk of freezing and cracking, the controller will open the first control valve, thereby drawing high-temperature refrigerant from the outdoor heat exchanger 3 (i.e., the condenser) into the heating pipe, and using the heating pipe to heat the water-fluorine heat exchanger 5, thereby increasing the temperature value of the water flow in the water-fluorine heat exchanger 5, thereby reducing the risk of freezing and cracking of the water-fluorine heat exchanger 5.

[0091] It can be understood that in this embodiment, the heat required for heating the water-fluorine heat exchanger 5 comes from the outdoor heat exchanger 3, that is, from the heat of the heat pump unit itself, and no external heat needs to be added. In this way, while preventing the water-fluorine heat exchanger 5 from freezing and cracking, it can also save energy and improve the energy utilization rate of the heat pump unit.

[0092] Furthermore, the step of adjusting the opening of the first control valve according to the interval range of the minimum value of the inlet water temperature and the outlet water temperature specifically includes:

[0093] According to the minimum value of the inlet water temperature and the outlet water temperature being in the first temperature range, controlling the first control valve to open to a first opening degree;

[0094] According to the minimum value of the inlet water temperature and the outlet water temperature being in the first temperature range, controlling the first control valve to open to a second opening degree;

[0095] According to the minimum value of the water inlet temperature and the water outlet temperature being in the first temperature range, the first control valve is controlled to open to a maximum opening degree.

[0096] The first temperature range is greater than the second temperature range, the second temperature range is greater than the third temperature range, the first opening is less than the second opening, and the second opening is less than the maximum opening.

[0097] In the above embodiment, the smaller the minimum value of the inlet water temperature and the outlet water temperature is, the greater the risk of freezing and cracking of the water-fluorine heat exchanger 5 is, so the controller controls the opening of the first control valve to be larger.

[0098] According to some other embodiments of the present invention, a waste heat collection device is provided at the compressor 1, and the waste heat collection device exchanges heat with the water-fluorine heat exchanger 5 through a heat exchange pipe, and a second control valve is provided on the heat exchange pipe.

[0099] The steps of generating a first execution logic according to a specific working mode, an inlet water temperature and an outlet water temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic specifically include:

[0100] Make sure the heat pump unit is in cooling mode or defrost mode;

[0101] According to the minimum value of the inlet water temperature and the outlet water temperature being less than the set temperature, the second control valve is controlled to open, and the opening of the second control valve is adjusted according to the interval range of the minimum value of the inlet water temperature and the outlet water temperature.

[0102] In this way, when the water-fluorine heat exchanger 5 has a risk of freezing and cracking, the controller will open the second control valve, thereby introducing the waste heat of the compressor 1 collected in the waste heat collection device into the heat exchange pipe, and using the heat exchange pipe to heat the water-fluorine heat exchanger 5, thereby increasing the temperature of the water flow in the water-fluorine heat exchanger 5, thereby reducing the risk of freezing and cracking of the water-fluorine heat exchanger 5. Among them, the waste heat collection device can store a heat storage medium, which collects the waste heat generated by the compressor 1 when it is working, and releases the waste heat to heat the water-fluorine heat exchanger 5 when necessary.

[0103] It can be understood that in the present embodiment, the heat required for heating the water-fluorine heat exchanger 5 comes from the waste heat generated by the operation of the compressor 1, that is, from the heat of the heat pump unit itself, and no external heat needs to be added. In this way, while achieving the purpose of preventing the water-fluorine heat exchanger 5 from freezing and cracking, it can also save energy and realize the reuse of the waste heat of the compressor 1, which is green and environmentally friendly and improves the overall energy utilization rate of the heat pump unit.

[0104] Furthermore, the step of adjusting the opening of the second control valve according to the interval range of the minimum value of the inlet water temperature and the outlet water temperature specifically includes:

[0105] According to the minimum value of the inlet water temperature and the outlet water temperature being in the first temperature range, controlling the second control valve to open to a first opening degree;

[0106] According to the minimum value of the inlet water temperature and the outlet water temperature being in the first temperature range, controlling the second control valve to open to a second opening degree;

[0107] According to the minimum value of the water inlet temperature and the water outlet temperature being in the first temperature range, the second control valve is controlled to open to a maximum opening degree.

[0108] The first temperature range is greater than the second temperature range, the second temperature range is greater than the third temperature range, the first opening is less than the second opening, and the second opening is less than the maximum opening.

[0109] In the above embodiment, the smaller the minimum value of the inlet water temperature and the outlet water temperature is, the greater the risk of freezing and cracking of the water-fluorine heat exchanger 5 is, so the controller controls the opening of the second control valve to be larger.

[0110] According to some embodiments of the present invention, the step of generating a first execution logic according to a specific working mode, an inlet water temperature and an outlet water temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic further includes:

[0111] Make sure the heat pump unit is in cooling mode or defrost mode;

[0112] According to the minimum value of the water inlet temperature and the water outlet temperature being less than the alarm temperature, the compressor 1 is controlled to stop, and the air conditioning system is controlled to issue an alarm.

[0113] In this way, when the minimum value of the inlet water temperature and the outlet water temperature is lower than the alarm temperature, it indicates that the water-fluorine heat exchanger 5 has been frozen and cracked. At this time, in order to avoid the occurrence of safety accidents, the controller will control the compressor 1 to shut down immediately and control the alarm module of the air-conditioning system to sound an alarm.

[0114] A specific embodiment of the control method of the present invention is described below.

[0115] When the unit is heating and defrosting, if the user sets the water flow rate of the water pump 6 to η% of the rated value in order to increase the temperature difference between the inlet and outlet, it can be seen from Q=cm△t that when the capacity is constant, the temperature difference is (1 / η%) times the rated value.

[0116] At this time, when defrosting, under certain outdoor working conditions, the heat required by the unit is certain. According to Q=cm△t, it can be known that the refrigeration heat exchange temperature difference △t is (1 / η%) times the rated water flow rate. At this time, it is easy for the outlet water temperature to be low due to the large temperature difference between the inlet and outlet water, which can easily cause the water-fluorine heat exchanger 5 to freeze and crack.

[0117] During the defrost process, when it is detected that min{Twi, Two}≤α℃, that is, when it is detected that the minimum value of the outlet water temperature and the inlet water temperature is less than or equal to α℃, the speed of the water pump 6 is adjusted to the maximum. When the defrost capacity is constant, the △t temperature difference will decrease due to the increase in water flow rate. At this time, the risk of freezing and cracking of the water-fluorine heat exchanger 5 will be minimized.

[0118] Similarly, when the unit is cooling, if the user sets the water flow rate of the water pump 6 to η% of the rated value in order to increase the temperature difference between the water inlet and outlet, it can be known from Q=cm△t that, under the condition of constant capacity, the temperature difference is (1 / η%) times the rated value. When it is detected that min{Twi, Two}≤α℃, that is, when it is detected that the minimum value of the outlet water temperature and the inlet water temperature is less than or equal to α℃, the speed of the water pump 6 is adjusted to the maximum to prevent the water-fluorine heat exchanger 5 from freezing and cracking.

[0119] Among them, the above-mentioned η is usually taken as 50-100, and α℃ is usually taken as 5℃.

[0120] The control device of the heat pump unit provided by the present invention is described below. The control device of the heat pump unit described below and the control method of the heat pump unit described above can be referred to each other.

[0121] like Figure 2 As shown, a control device for a heat pump unit according to an embodiment of the second aspect of the present invention comprises:

[0122] The first acquisition module 110 is used to acquire the current working mode of the heat pump unit;

[0123] The second acquisition module 120 is used to receive a signal indicating that the heat pump unit is in a specific working mode, and obtain the inlet water temperature and the outlet water temperature of the water-fluorine heat exchanger 5 in the heat pump unit;

[0124] The control module 130 is used to generate a first execution logic according to a specific working mode, an inlet water temperature and an outlet water temperature, and adjust the working parameters of the heat pump unit according to the first execution logic.

[0125] like Figure 3 As shown, the heat pump unit according to the third embodiment of the present invention comprises a water-fluorine heat exchanger 5, an outdoor heat exchanger 3, a compressor 1, a four-way valve 2 and an electronic expansion valve 4 which are connected to each other, and also comprises a control device of the heat pump unit. The two ends of the water-fluorine heat exchanger 5 are respectively connected to a water inlet pipe and a water outlet pipe, and a water pump 6 with adjustable speed is arranged on the water inlet pipe.

[0126] Figure 4 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 4 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the control method of the heat pump unit.

[0127] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0128] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the above-mentioned heat pump unit.

[0129] In yet another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to execute the control method of the heat pump unit.

[0130] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0131] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a heat pump unit, characterized in that: include: Get the current working mode of the heat pump unit; Receiving a signal that the heat pump unit is in a specific working mode, obtaining the water inlet temperature and the water outlet temperature of the water-fluorine heat exchanger in the heat pump unit; A first execution logic is generated according to a specific working mode, the water inlet temperature and the water outlet temperature, and the working parameters of the heat pump unit are adjusted according to the first execution logic.

2. The control method of the heat pump unit according to claim 1, characterized in that: In the step of receiving a signal indicating that the heat pump unit is in a specific working mode and obtaining an inlet water temperature and an outlet water temperature of a water-fluorine heat exchanger in the heat pump unit, the specific working mode includes a defrost mode and a refrigeration mode.

3. The control method of the heat pump unit according to claim 2, characterized in that: The step of generating a first execution logic according to the specific working mode, the water inlet temperature and the water outlet temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic specifically includes: Determining whether the heat pump unit is in a cooling mode or a defrosting mode; The rotation speed of the water pump is adjusted according to the interval range of the minimum value of the water inlet temperature and the water outlet temperature, wherein the water pump is installed on the water inlet pipeline or the water outlet pipeline of the water-fluorine heat exchanger.

4. The control method of the heat pump unit according to claim 3, characterized in that: The step of adjusting the rotation speed of the water pump according to the interval range of the minimum value between the water inlet temperature and the water outlet temperature specifically includes: According to the minimum value of the water inlet temperature and the water outlet temperature being in the first temperature range, adjusting the rotation speed of the water pump to a first rotation speed; According to the minimum value of the water inlet temperature and the water outlet temperature being in the second temperature range, adjusting the rotation speed of the water pump to a second rotation speed; According to the minimum value of the water inlet temperature and the water outlet temperature being in the third temperature range, adjusting the rotation speed of the water pump to the maximum rotation speed; The first temperature range is greater than the second temperature range, the second temperature range is greater than the third temperature range, the first rotational speed is less than the second rotational speed, and the second rotational speed is less than the maximum rotational speed.

5. The control method of the heat pump unit according to claim 2, characterized in that: The step of generating a first execution logic according to the specific working mode, the water inlet temperature and the water outlet temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic specifically includes: Determining whether the heat pump unit is in a cooling mode or a defrosting mode; The operating frequency of the compressor is adjusted according to the interval range of the minimum value between the inlet water temperature and the outlet water temperature.

6. The control method of the heat pump unit according to claim 5, characterized in that: The step of adjusting the operating frequency of the compressor according to the interval range of the minimum value between the inlet water temperature and the outlet water temperature comprises: According to the minimum value between the water inlet temperature and the water outlet temperature being in the first temperature range, adjusting the operating frequency of the compressor to a first frequency; According to the minimum value between the water inlet temperature and the water outlet temperature being in the second temperature range, adjusting the operating frequency of the compressor to the first frequency; According to the minimum value of the water inlet temperature and the water outlet temperature being in the third temperature range, adjusting the operating frequency of the compressor to the lowest frequency in the cooling mode or the defrosting mode; The first temperature range is greater than the second temperature range, the second temperature range is greater than the third temperature range, the first frequency is greater than the second frequency, and the second frequency is greater than the minimum frequency.

7. The control method of the heat pump unit according to claim 2, characterized in that: A heating pipe is led out of the outdoor heat exchanger to the water-fluorine heat exchanger, and a first control valve is provided on the heating pipe; The step of generating a first execution logic according to the specific working mode, the water inlet temperature and the water outlet temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic specifically includes: Determining whether the heat pump unit is in a cooling mode or a defrosting mode; According to the minimum value of the inlet water temperature and the outlet water temperature being less than the set minimum temperature, the first control valve is controlled to open, and the opening of the first control valve is adjusted according to the interval range of the minimum value of the inlet water temperature and the outlet water temperature.

8. The control method of the heat pump unit according to claim 2, characterized in that: The compressor is provided with a waste heat collection device, which exchanges heat with the water-fluorine heat exchanger through a heat exchange pipeline, and a second control valve is provided on the heat exchange pipeline; The step of generating a first execution logic according to the specific working mode, the water inlet temperature and the water outlet temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic specifically includes: Determining whether the heat pump unit is in a cooling mode or a defrosting mode; According to the minimum value of the inlet water temperature and the outlet water temperature being less than the set temperature, the second control valve is controlled to open, and the opening of the second control valve is adjusted according to the interval range of the minimum value of the inlet water temperature and the outlet water temperature.

9. The control method of a heat pump unit according to any one of claims 1 to 8, characterized in that: The step of generating a first execution logic according to the specific working mode, the water inlet temperature and the water outlet temperature, and adjusting the working parameters of the heat pump unit according to the first execution logic also includes: Determining whether the heat pump unit is in a cooling mode or a defrosting mode; According to the minimum value of the water inlet temperature and the water outlet temperature being less than the alarm temperature, the compressor is controlled to stop, and the air conditioning system is controlled to issue an alarm.

10. A control device for a heat pump unit, characterized in that: include: The first acquisition module is used to acquire the current working mode of the heat pump unit; A second acquisition module is used to receive a signal that the heat pump unit is in a specific working mode, and obtain the inlet water temperature and the outlet water temperature of the water-fluorine heat exchanger in the heat pump unit; The control module is used to generate a first execution logic according to a specific working mode, the water inlet temperature and the water outlet temperature, and adjust the working parameters of the heat pump unit according to the first execution logic.

11. A heat pump unit, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the control method of the heat pump unit according to any one of claims 1 to 9 is implemented.

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