Heat pump unit, air conditioner and control method

Abstract

The invention provides a heat pump unit, an air conditioner and a control method. When the heat pump unit is in a refrigeration mode, the outdoor wet-bulb temperature is larger than or equal to a wet-bulb temperature threshold value, and the outdoor dry-bulb temperature is larger than a dry-bulb temperature threshold value, the series flow path and the first bypass flow path are both in a conducting state. In other words, part of the refrigerant is adopted for heat exchange through a series flow path which is formed by connecting the air-cooled condenser in series and then connecting the evaporation cold condenser in series, and the other part of the refrigerant is synchronously adopted to cross the air-cooled condenser and directly enter the evaporation cold condenser for heat exchange, so that the evaporation cold condenser can participate in heat exchange more sufficiently; the energy efficiency of the whole heat pump unit is improved, and the refrigeration use experience of a user is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioners, and particularly to a heat pump unit, an air conditioner and a control method thereof. Background Art

[0002] In a conventional heat pump unit, only an evaporative air-cooled condenser is provided, which only has a refrigeration function in summer and lacks a heating function in winter. The reason is that the outdoor temperature is often below 0°C in winter, the sprayed water freezes, and the heat exchange effect of the evaporative air-cooled condenser as an evaporator is poor.

[0003] In some related technologies, the heat pump unit can adopt a mode of combining an evaporative air-cooled condenser and an air-cooled condenser to solve the problem that the evaporative air-cooled condenser cannot heat in winter. However, when the heat pump unit is refrigerating in summer, for a heat pump unit that first connects the air-cooled condenser in series and then connects the evaporative air-cooled condenser in series, there is a problem that the heat exchange of the evaporative air-cooled condenser is insufficient, resulting in poor energy efficiency of the heat pump unit. Summary of the Invention

[0004] In view of this, in order to solve the technical problem that in a heat pump unit that first connects an air-cooled condenser in series and then connects an evaporative air-cooled condenser in series in the prior art, the heat exchange is insufficient during summer refrigeration, resulting in poor energy efficiency of the heat pump unit, the present disclosure provides a heat pump unit, an air conditioner and a control method thereof.

[0005] According to a first aspect of an embodiment of the present disclosure, a heat pump unit is provided. The heat pump unit includes a first refrigerant main port, a second refrigerant main port and a series flow path. The series flow path includes a first heat exchange flow path, an intermediate flow path and a second heat exchange flow path connected in series. A first end of the first heat exchange flow path is communicated with the first refrigerant main port, a second end of the first heat exchange flow path is communicated with a first end of the intermediate flow path, a first end of the second heat exchange flow path is communicated with a second end of the intermediate flow path, and a second end of the second heat exchange flow path is communicated with the second refrigerant main port. The first heat exchange flow path includes an air-cooled condenser, and the second heat exchange flow path includes an evaporative air-cooled condenser; The heat pump unit includes a first bypass flow path corresponding to the first heat exchange flow path. The first refrigerant main port is communicated with a first end of the first bypass flow path, and a first end of the intermediate flow path is communicated with a second end of the first bypass flow path; Wherein, when the heat pump unit is in a refrigeration mode, and when the outdoor wet bulb temperature is greater than or equal to a wet bulb temperature threshold and the outdoor dry bulb temperature is greater than a dry bulb temperature threshold, both the series flow path and the first bypass flow path are in a conducting state, and both the evaporative air-cooled condenser and the air-cooled condenser are in a working state.

[0006] In an optional embodiment, the first heat exchange flow path includes a first flow path and a second flow path, the second heat exchange flow path includes a third flow path and a fourth flow path, a first end of the first flow path is communicated with the first total refrigerant port, a first refrigerant port of the air-cooled condenser is communicated with a second end of the first flow path, a second refrigerant port of the air-cooled condenser is communicated with a first end of the second flow path, a second end of the second flow path is communicated with a first end of the intermediate flow path, a second end of the intermediate flow path is communicated with a first end of the third flow path, a third refrigerant port of the evaporative condenser is communicated with a second end of the third flow path, a fourth refrigerant port of the evaporative condenser is communicated with a first end of the fourth flow path, and a second end of the fourth flow path is communicated with the second total refrigerant port; The first flow path includes a first control valve, the second flow path includes a second control valve, the third flow path includes a third control valve, the fourth flow path includes a fourth control valve, and the first bypass flow path includes a first bypass valve; Wherein, when the heat pump unit is in the refrigeration mode, when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is greater than the dry bulb temperature threshold, the first control valve, the second control valve, the third control valve, the fourth control valve and the first bypass valve are all in the conducting state.

[0007] In an optional embodiment, the opening degree of the first bypass valve is adjustable, the initial opening degree of the first bypass valve is a first set opening degree, and when the first bypass valve is in the conducting state, every first set time interval, based on the first current heat dissipation amount of the air-cooled condenser and the second current heat dissipation amount of the evaporative condenser, the opening degree of the first bypass valve is adjusted.

[0008] In an optional embodiment, the heat pump unit includes a second bypass flow path corresponding to the second heat exchange flow path, a first end of the second bypass flow path is communicated with a second end of the intermediate flow path, and a second end of the second bypass flow path is communicated with the second total refrigerant port; Wherein, when the heat pump unit is in the refrigeration mode, when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is less than or equal to the dry bulb temperature threshold, the first heat exchange flow path and the second bypass flow path are both in the conducting state, the second heat exchange flow path and the first bypass flow path are in the closed state, and the air-cooled condenser is in the working state and the evaporative condenser is in the non-working state.

[0009] In an optional embodiment, the second bypass flow path includes a second bypass valve, and the second bypass valve is used to control the conducting state and the closed state of the second bypass flow path.

[0010] In an alternative embodiment, when the heat pump unit is in the heating mode, the first bypass flow path and the second heat exchange flow path are in a closed state, the first heat exchange flow path and the second bypass flow path are in a conducting state, and the air-cooled condenser is in an operating state while the evaporative air-cooled condenser is in a non-operating state.

[0011] In an alternative embodiment, when the heat pump unit is in the cooling mode and the outdoor wet bulb temperature is less than the wet bulb temperature threshold, the first heat exchange flow path is in a closed state, the first bypass flow path and the second heat exchange flow path are both in a conducting state, and the air-cooled condenser is in a non-operating state while the evaporative air-cooled condenser is in an operating state.

[0012] According to a second aspect of the embodiments of the present disclosure, there is provided an air conditioner, which includes the heat pump unit according to any one of the first aspect.

[0013] According to a third aspect of the embodiments of the present disclosure, there is provided a control method, which is applied to the heat pump unit according to any one of the first aspect, and the control method includes: When the heat pump unit is in the cooling mode, and when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is greater than the dry bulb temperature threshold, control the series flow path and the first bypass flow path of the heat pump unit to be both in a conducting state, and control both the air-cooled condenser and the evaporative air-cooled condenser to be in an operating state.

[0014] In an alternative embodiment, the first bypass flow path includes a first bypass valve, and the control method includes: When the heat pump unit is in the cooling mode, and when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is greater than the dry bulb temperature threshold, control the first bypass valve to conduct with a first set opening as the initial opening, and at every interval of the first set duration, adjust the opening of the first bypass valve based on the first current heat dissipation amount (Q1) of the air-cooled condenser and the second current heat dissipation amount (Q2) of the evaporative air-cooled condenser.

[0015] In an alternative embodiment, the adjusting the opening of the first bypass valve based on the first current heat dissipation amount (Q1) of the air-cooled condenser and the second current heat dissipation amount (Q2) of the evaporative air-cooled condenser includes: If Q2 / (Q1 + Q2) is greater than or equal to the lower limit value of the heat dissipation ratio and less than or equal to the upper limit value of the heat dissipation ratio, control the opening of the first bypass valve to maintain the current state.

[0016] In an optional implementation, adjusting the opening degree of the first bypass valve based on the first current heat dissipation amount (Q1) of the air-cooled condenser and the second current heat dissipation amount (Q2) of the evaporative air-cooled condenser includes: If Q2 / (Q1 + Q2) is less than the lower limit value of the heat dissipation ratio, increase the opening degree of the first bypass valve by a second set opening degree until the opening degree of the first bypass valve reaches the maximum opening degree.

[0017] In an optional implementation, adjusting the opening degree of the first bypass valve based on the first current heat dissipation amount (Q1) of the air-cooled condenser and the second current heat dissipation amount (Q2) of the evaporative air-cooled condenser includes: If Q2 / (Q1 + Q2) is greater than the upper limit value of the heat dissipation ratio, decrease the opening degree of the first bypass valve by a third set opening degree until the first bypass valve is closed.

[0018] In an optional implementation, the control method includes: When the heat pump unit is in the refrigeration mode and the outdoor wet bulb temperature is less than the wet bulb temperature threshold, control the first heat exchange flow path of the heat pump unit to be in the closed state, and control both the first bypass flow path and the second heat exchange flow path to be in the conducting state, and control the evaporative air-cooled condenser to be in the working state, and control the air-cooled condenser to be in the non-working state.

[0019] In an optional implementation, the first bypass flow path includes a first bypass valve, and the control method includes: When the heat pump unit is in the refrigeration mode and the outdoor wet bulb temperature is less than the wet bulb temperature threshold, control the opening degree of the first bypass valve to be the maximum opening degree.

[0020] In an optional implementation, the heat pump unit includes a second bypass flow path, and the control method includes: When the heat pump unit is in the refrigeration mode, and the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold, and the outdoor dry bulb temperature is less than or equal to the dry bulb temperature threshold, control both the first heat exchange flow path and the second bypass flow path to be in the conducting state, and control both the second heat exchange flow path and the first bypass flow path to be in the closed state, and control the air-cooled condenser to be in the working state, and control the evaporative air-cooled condenser to be in the non-working state.

[0021] In an optional implementation, the second bypass flow path includes a second bypass valve, and the control method includes: When the heat pump unit is in the cooling mode, and when the outdoor wet-bulb temperature is greater than or equal to the wet-bulb temperature threshold and the outdoor dry-bulb temperature is less than or equal to the dry-bulb temperature threshold, control the opening degree of the second bypass valve to the maximum opening degree.

[0022] In an optional implementation manner, the control method includes: When the heat pump unit is in the heating mode, control both the first heat exchange flow path and the second bypass flow path to be in the conducting state, control the first bypass flow path and the second heat exchange flow path to be in the closed state, control the evaporative air-cooled condenser to be in the non-operating state, and control the air-cooled condenser to be in the operating state.

[0023] In an optional implementation manner, the control method includes: When the heat pump unit is in the heating mode, based on the liquid outlet temperature of the shell-and-tube heat exchanger of the air conditioner and the set temperature threshold, adjust the operating frequency of the first fan of the air-cooled condenser.

[0024] In an optional implementation manner, the control method includes: When the heat pump unit is in the cooling mode, and when the evaporative air-cooled condenser is in the operating state, based on the high-pressure of the evaporative air-cooled condenser, adjust the operating frequency of the second fan of the evaporative air-cooled condenser.

[0025] In an optional implementation manner, the control method includes: When the heat pump unit is in the cooling mode, and when the air-cooled condenser is in the operating state, based on the high-pressure of the air-cooled condenser, adjust the operating frequency of the first fan of the air-cooled condenser.

[0026] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: In the present disclosure, a heat pump unit may include a series flow path, and the series flow path may include a first heat exchange flow path, an intermediate flow path, and a second heat exchange flow path. The first heat exchange flow path includes an air-cooled condenser, and the second heat exchange flow path includes an evaporative condenser. The first heat exchange flow path, the intermediate flow path, and the second heat exchange flow path are connected in sequence. Moreover, the first end of the first heat exchange flow path is connected to the first total refrigerant port of the heat pump unit, and the second end of the second heat exchange flow path is connected to the second total refrigerant port, thereby forming a series flow path, that is, the series flow path includes a series-connected air-cooled condenser and an evaporative condenser. In addition, the heat pump unit is further provided with a first bypass flow path corresponding to the first heat exchange flow path. The first end of the first bypass flow path is connected in parallel with the first heat exchange flow path in the heat pump unit. When the heat pump unit is in the refrigeration mode, and when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is greater than the dry bulb temperature threshold, both the series flow path and the first bypass flow path are in the conducting state. That is to say, the first heat exchange flow path, the second heat exchange flow path, the intermediate flow path, and the first bypass flow path are all in the conducting state, and both the evaporative condenser and the air-cooled condenser are in the working state. In this case, part of the refrigerant of the heat pump unit can exchange heat through the series-connected air-cooled condenser and evaporative condenser, and another part of the refrigerant can bypass the air-cooled condenser and directly exchange heat through the evaporative condenser. Since the lower the outdoor wet bulb temperature, the better the heat exchange effect of the evaporative condenser, and the lower the outdoor dry bulb temperature, the better the heat exchange effect of the air-cooled condenser, and the evaporative condenser uses spray water evaporation heat exchange, and its heat exchange energy efficiency is greater than that of the air-cooled condenser. Therefore, when both the outdoor wet bulb temperature and the outdoor dry bulb temperature are relatively high, the present disclosure uses part of the refrigerant to exchange heat through a series flow path that first connects the air-cooled condenser in series and then connects the evaporative condenser in series, and simultaneously uses another part of the refrigerant to bypass the air-cooled condenser and directly enter the evaporative condenser for heat exchange, so that the evaporative condenser can participate in heat exchange more fully, improve the energy efficiency of the entire heat pump unit, and enhance the user's refrigeration experience.

[0027] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention.

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated. The drawings in the figures do not constitute a scale limitation.

[0031] Figure 1 It is a schematic diagram of the flow path of a heat pump unit shown according to an exemplary embodiment.

[0032] Figure 2 It is a schematic diagram of the flow path of an air conditioner shown according to an exemplary embodiment.

[0033] Figure 3 It is a schematic diagram of the control method of a heat pump unit in the cooling mode shown according to an exemplary embodiment.

[0034] Figure 4 It is a schematic diagram of the control method of a heat pump unit in the heating mode shown according to an exemplary embodiment.

[0035] Wherein: 1. First heat exchange flow path; 11. First flow path; 111. First control valve; 12. Second flow path; 121. Second control valve; 13. Air-cooled condenser; 131. First fan; 2. Second heat exchange flow path; 21. Third flow path; 211. Third control valve; 22. Fourth flow path; 221. Fourth control valve; 23. Evaporative air condenser; 231. Second fan; 3. Intermediate flow path; 4. First bypass flow path; 41. First bypass valve; 5. Second bypass flow path; 51. Second bypass valve; 6. First refrigerant main port; 7. Second refrigerant main port; 10. Heat pump unit; 20. Electronic expansion valve; 30. Shell-and-tube heat exchanger; 40. Compressor; 50. Four-way valve; 101. First air outlet temperature sensor; 102. First air inlet temperature sensor; 103. Second air outlet temperature sensor; 104. Second air inlet temperature sensor; 105. Pressure sensor; 106. Water outlet temperature sensor. Detailed implementation manners

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0037] The following disclosure provides many different embodiments or examples for implementing different aspects of the present invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various embodiments and / or arrangements discussed.

[0038] For ease of description, spatially relative terms may be used in this document to describe the relative positional relationship or movement of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms, such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", "front", "rear", etc. This spatially relative relationship term is intended to include different orientations of the device in use or operation other than the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip, attitude change, or motion state change, then these directional indications will change accordingly. For example, an element described as "below" or "beneath" another element or feature will then be oriented as "above" or "over" another element or feature. Therefore, the exemplary term "below" can include both the upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or in other directions) and the spatially relative descriptors used in this document are interpreted accordingly.

[0039] It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application schematically. Therefore, only the components related to the present application are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation may be arbitrarily changed, and the component layout type may also be more complex.

[0040] The following will describe the implementation manners of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation manners. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application and not for limiting the protection scope of the present application.

[0041] To solve the technical problem in the prior art that in a heat pump unit where an air-cooled condenser is connected in series first and then an evaporative condenser is connected in series, heat exchange is insufficient during summer refrigeration, resulting in poor energy efficiency of the heat pump unit, the present disclosure provides a heat pump unit, an air conditioner, and a control method.

[0042] In the present disclosure, the heat pump unit may include a series flow path. The series flow path may include a first heat exchange flow path, an intermediate flow path, and a second heat exchange flow path. The first heat exchange flow path includes an air-cooled condenser, and the second heat exchange flow path includes an evaporative condenser. The first heat exchange flow path, the intermediate flow path, and the second heat exchange flow path are connected in sequence. Moreover, the first end of the first heat exchange flow path is connected to the first refrigerant header of the heat pump unit, and the second end of the second heat exchange flow path is connected to the second refrigerant header, thereby forming a series flow path, that is, the series flow path includes a series-connected air-cooled condenser and an evaporative condenser. Additionally, the heat pump unit is further provided with a first bypass flow path corresponding to the first heat exchange flow path. The first end of the first bypass flow path is in parallel with the first heat exchange flow path in the heat pump unit. When the heat pump unit is in the cooling mode, and when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is greater than the dry bulb temperature threshold, both the series flow path and the first bypass flow path are in the conducting state. That is to say, the first heat exchange flow path, the second heat exchange flow path, the intermediate flow path, and the first bypass flow path are all in the conducting state, and both the evaporative condenser and the air-cooled condenser are in the operating state. In this case, part of the refrigerant of the heat pump unit can exchange heat through the series-connected air-cooled condenser and evaporative condenser, and another part of the refrigerant can bypass the air-cooled condenser and directly exchange heat through the evaporative condenser. Since the lower the outdoor wet bulb temperature, the better the heat exchange effect of the evaporative condenser, and the lower the outdoor dry bulb temperature, the better the heat exchange effect of the air-cooled condenser, and the evaporative condenser uses spray water evaporation heat exchange, and its heat exchange energy efficiency is greater than that of the air-cooled condenser. Therefore, when both the outdoor wet bulb temperature and the outdoor dry bulb temperature are relatively high in the present disclosure, part of the refrigerant is used to exchange heat through a series flow path that first connects the air-cooled condenser in series and then connects the evaporative condenser in series, and at the same time, another part of the refrigerant bypasses the air-cooled condenser and directly enters the evaporative condenser for heat exchange, so that the evaporative condenser can participate in heat exchange more fully, improving the energy efficiency of the entire heat pump unit and enhancing the user's cooling experience.

[0043] In one exemplary embodiment, referring to Figures 1 to 3 As shown, a heat pump unit 10 is provided, as well as an air conditioner including the above heat pump unit 10, and a control method applied to the heat pump unit 10. In this embodiment, the heat pump unit 10 includes a first refrigerant header 6, a second refrigerant header 7, and a series flow path. In the cooling mode, the first refrigerant header 6 is the refrigerant inlet of the heat pump unit 10, and the second refrigerant header 7 is the refrigerant outlet of the heat pump unit 10.

[0044] Among them, the series flow path includes a series-connected first heat exchange flow path 1, an intermediate flow path 3, and a second heat exchange flow path 2. The first heat exchange flow path 1 includes an air-cooled condenser 13, that is, the first heat exchange flow path 1 is the heat exchange flow path of the air-cooled condenser 13. The second heat exchange flow path 2 includes an evaporative condenser 23, that is, the second heat exchange flow path 2 is the heat exchange flow path of the evaporative condenser 23.

[0045] Among them, the first end of the first heat exchange flow path 1 is communicated with the first refrigerant header 6, the second end of the first heat exchange flow path 1 is communicated with the first end of the intermediate flow path 3, the first end of the second heat exchange flow path 2 is communicated with the second end of the intermediate flow path 3, and the second end of the second heat exchange flow path 2 is communicated with the second refrigerant header 7. When the heat pump unit 10 is in the refrigeration mode, the first refrigerant header 6 can transmit the refrigerant to the first heat exchange flow path 1, and then from the first heat exchange flow path 1 through the intermediate flow path 3, it is transmitted to the second heat exchange flow path 2, and then is transmitted to the outside of the heat pump unit 10 via the second refrigerant header 7.

[0046] Among them, the heat pump unit 10 may include a first bypass flow path 4 corresponding to the first heat exchange flow path 1. The first end of the first refrigerant header 6 is communicated with the first end of the first bypass flow path 4, and the first end of the intermediate flow path 3 is communicated with the second end of the first bypass flow path 4. That is, the first bypass flow path 4 is in parallel with the first heat exchange flow path 1 and can divert the refrigerant transmitted from the first refrigerant header 6 to the heat pump unit 10.

[0047] Among them, when the heat pump unit 10 is in the refrigeration mode and when both the outdoor wet bulb temperature T_wet and the outdoor dry bulb temperature T_dry are relatively high, that is, when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold B and the outdoor dry bulb temperature is greater than the dry bulb temperature threshold C, both the series flow path and the first bypass flow path 4 are in the conducting state, and both the evaporative condenser 23 and the air-cooled condenser 13 are in the working state. That is to say, the first heat exchange flow path 1, the second heat exchange flow path 2, the intermediate flow path 3, and the first bypass flow path 4 are all in the conducting state, and both the evaporative condenser 23 and the air-cooled condenser 13 are in the working state.

[0048] Among them, the heat pump unit 10 may include a control device, and the control device can determine the mode of the heat pump unit 10 based on the mode in which the air conditioner is currently located. For example, if the air conditioner is in the refrigeration mode, it is considered that the heat pump unit 10 is in the refrigeration mode. In addition, the control device can also obtain the outdoor wet bulb temperature and the outdoor dry bulb temperature, and can judge the magnitude relationship between the outdoor wet bulb temperature and the wet bulb temperature threshold, and judge the magnitude relationship between the outdoor dry bulb temperature and the dry bulb temperature threshold. When the control device determines that the heat pump unit 10 is in the refrigeration mode and determines that the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is greater than the dry bulb temperature threshold, the control device can control both the series flow path and the first bypass flow path 4 of the heat pump unit 10 to be in the conducting state, and control both the air-cooled condenser 13 and the evaporative condenser 23 to be in the working state.

[0049] It should be noted that the lower the outdoor wet-bulb temperature, the better the heat exchange effect of the evaporative condenser 23, and the lower the outdoor dry-bulb temperature, the better the heat exchange effect of the air-cooled condenser 13. Moreover, the evaporative condenser 23 uses spray water evaporation for heat exchange, and its heat exchange energy efficiency is greater than that of the air-cooled condenser 13. Therefore, in this embodiment, when the heat pump unit 10 is in the cooling mode and both the outdoor wet-bulb temperature and the outdoor dry-bulb temperature are relatively high, that is, when the outdoor wet-bulb temperature is greater than or equal to the wet-bulb temperature threshold and the outdoor dry-bulb temperature is greater than the dry-bulb temperature threshold, part of the refrigerant of the heat pump unit 10 can exchange heat through the series-connected air-cooled condenser 13 and evaporative condenser 23, and another part of the refrigerant can bypass the air-cooled condenser 13 and directly exchange heat through the evaporative condenser 23, so that the evaporative condenser 23 can participate in heat exchange more fully, improving the energy efficiency of the entire heat pump unit 10 and enhancing the user's cooling experience.

[0050] In an exemplary embodiment, as shown in Figures 1 to 4 a heat pump unit 10, an air conditioner including the above heat pump unit 10, and a control method applied to the heat pump unit 10 are provided. This embodiment can be a further improvement of the above embodiment. Among them, the heat pump unit 10 may include a second bypass flow path 5 corresponding to the second heat exchange flow path 2. The first end of the second bypass flow path 5 is communicated with the second end of the intermediate flow path 3, and the second end of the second bypass flow path 5 is communicated with the second refrigerant header 7. That is to say, in the heat pump unit 10, the second bypass flow path 5 is connected in parallel with the second heat exchange flow path 2.

[0051] Among them, when the heat pump unit 10 is in the heating mode, the control device can control both the first heat exchange flow path 1 and the second bypass flow path 5 to be in the conducting state, control the first bypass flow path 4 and the second heat exchange flow path 2 to be in the closed state, control the air-cooled condenser 13 to be in the working state, and control the evaporative condenser 23 to be in the non-working state.

[0052] It should be noted that since the evaporative condenser 23 is prone to icing during winter heating, in this embodiment, when the heat pump unit 10 is in the heating mode, the air-cooled condenser 13 can be used for heat exchange and heating, while the evaporative condenser 23 is closed, so as to better ensure the normal heating of the heat pump unit 10.

[0053] In this embodiment, the heat pump unit 10 constituted by the first heat exchange flow path 1, the intermediate flow path 3, the second heat exchange flow path 2, the first bypass flow path 4, the second bypass flow path 5, etc. can realize heating by using the air-cooled condenser 13 in the heating mode, thereby avoiding the icing of the evaporative-cooled condenser 23 and better ensuring the heating effect of the heat pump unit 10. In addition, in the cooling mode, when both the outdoor wet bulb temperature and the outdoor dry bulb temperature are relatively high, a part of the refrigerant first exchanges heat and cools down by using the air-cooled condenser 13, and then exchanges heat and cools down by using the evaporative-cooled condenser 23, and another part of the refrigerant directly exchanges heat and cools down by using the evaporative-cooled condenser 23, thereby better ensuring the sufficient heat dissipation of the evaporative-cooled condenser 23 and improving the cooling effect in the cooling mode.

[0054] That is to say, the heat pump unit 10 of this embodiment can not only use the air-cooled condenser 13 for heating, but also use the air-cooled condenser 13 and the evaporative-cooled condenser 23 for cooling at the same time, and can better ensure the sufficient heat dissipation of the evaporative-cooled condenser 23 during cooling, improving the cooling effect.

[0055] In addition, in this embodiment, the air conditioner may include a shell-and-tube heat exchanger 30, and the shell-and-tube heat exchanger 30 includes a refrigerant passage and a hot water passage. Among them, when the heat pump unit 10 is in the heating mode, the refrigerant outlet of the shell-and-tube heat exchanger 30 is communicated with the first refrigerant main port 6.

[0056] Among them, when the heat pump unit 10 is in the heating mode, the control device can adjust the operating frequency of the first fan 131 of the air-cooled condenser 13 based on the outlet water temperature of the hot water passage of the shell-and-tube heat exchanger 30 of the air conditioner and the set temperature threshold. A water outlet temperature sensor 106 can be provided on the water outlet pipeline of the shell-and-tube heat exchanger 30 for detecting its outlet water temperature.

[0057] In some embodiments, referring to Figure 1 、 Figure 2 and Figure 4As shown, when the heat pump unit 10 is in the heating mode, the control device can control the first control valve 111, the second control valve 121, and the second bypass valve 51 to be in the conducting state, and control the third control valve 211, the fourth control valve 221, and the first bypass valve 41 to be in the closed state, and the second bypass valve 51 to be in the fully open state. The control device can also control the second fan 231 to be in the non-operating state (i.e., the closed state), control the first fan 131 to be in the operating state, and control the first fan 131 to start at the first set frequency X as the initial frequency. In this embodiment, every time the second set duration passes, the outlet water temperature T1 of the shell-and-tube heat exchanger 30 is detected, and the difference between it and the set temperature threshold Tset is calculated. Among them, when |T1 - Tset| ≥ A, where A is the limit value of the outlet water temperature difference (which can be set according to actual needs), the frequency of the first fan 131 can be adjusted according to the formula: the frequency of the first fan 131 = the initial frequency X + a*(T1 - Tset). Where a is a constant, which can be set according to actual needs and is not limited here. When |T1 - Tset| < A, the frequency of the first fan 131 can be controlled to maintain the current state. After each adjustment of the frequency of the first fan 131, after the first set duration, the outlet water temperature can be detected again, and the above judgment and control can be carried out again. This cycle continues until the frequency of the first fan 131 is adjusted to the maximum value, then the frequency will not increase anymore; or, until the first fan 131 is turned off, then the frequency will not decrease anymore.

[0058] In this embodiment, by reasonably adjusting the frequency of the first fan 131, the heat exchange effect of the heat pump unit 10 can be better improved, thereby better ensuring the heating effect of the heat pump unit 10. It should be noted that the frequency of the first fan 131 can be adjusted by other methods in addition to the above method, and this is not limited here.

[0059] In an exemplary embodiment, refer to Figures 1 to 3 As shown, a heat pump unit 10, an air conditioner including the above heat pump unit 10, and a control method applied to the heat pump unit 10 are provided. In this embodiment, the first heat exchange flow path 1 includes a first flow path 11 and a second flow path 12, and the second heat exchange flow path 2 includes a third flow path 21 and a fourth flow path 22.

[0060] Among them, the first end of the first flow path 11 is communicated with the first refrigerant header 6, the first refrigerant port of the air-cooled condenser 13 is communicated with the second end of the first flow path 11, the second refrigerant port of the air-cooled condenser 13 is communicated with the first end of the second flow path 12, the second end of the second flow path 12 is communicated with the first end of the intermediate flow path 3, the second end of the intermediate flow path 3 is communicated with the first end of the third flow path 21, the third refrigerant port of the evaporative air-cooled condenser 23 is communicated with the second end of the third flow path 21, the fourth refrigerant port of the evaporative air-cooled condenser 23 is communicated with the first end of the fourth flow path 22, and the second end of the fourth flow path 22 is communicated with the second refrigerant header 7. That is, the first flow path 11, the air-cooled condenser 13, the second flow path 12, the intermediate flow path 3, the third flow path 21, the evaporative air-cooled condenser 23, and the fourth flow path 22 form a series flow path of the heat pump unit 10.

[0061] Among them, control valves can be provided on the first flow path 11, the second flow path 12, the third flow path 21, and the fourth flow path 22 respectively to control the on and off of the corresponding flow paths. By way of example, the first flow path 11 includes a first control valve 111, the second flow path 12 includes a second control valve 121, the third flow path 21 includes a third control valve 211, and the fourth flow path 22 includes a fourth control valve 221. It should be noted that the control valve in this embodiment can be a globe valve or other valve types, and no limitation is made thereto.

[0062] In addition, the first bypass flow path 4 may include a first bypass valve 41. When the heat pump unit 10 is in the refrigeration mode, and when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is greater than the dry bulb temperature threshold, the first control valve 111, the second control valve 121, the third control valve 211, the fourth control valve 221, and the first bypass valve 41 are all in the on state, so that both the series flow path and the first bypass flow path 4 are in the on state.

[0063] That is, in this embodiment, the on and off of the series flow path can be controlled by the first control valve 111, the second control valve 121, the third control valve 211, and the fourth control valve 221, and the on and off of the first bypass flow path 4 can be controlled by the first bypass valve 41.

[0064] Among them, the control device of the heat pump unit 10 can be electrically connected to the above-mentioned first control valve 111, second control valve 121, third control valve 211, fourth control valve 221, and first bypass valve 41. When it is determined that the heat pump unit 10 is in the refrigeration mode, and when the outdoor wet-bulb temperature is greater than or equal to the wet-bulb temperature threshold, and the outdoor dry-bulb temperature is greater than the dry-bulb temperature threshold, the control device can control the first control valve 111, second control valve 121, third control valve 211, fourth control valve 221, and first bypass valve 41 to be in the conducting state, so that the series flow path and the first bypass flow path 4 are both in the conducting state. At the same time, the control device can control the evaporative air-cooled condenser 23 and the air-cooled condenser 13 to be in the working state. In this case, a part of the refrigerant first exchanges heat and refrigerates using the air-cooled condenser 13, and then exchanges heat and refrigerates using the evaporative air-cooled condenser 23, and another part of the refrigerant directly exchanges heat and refrigerates using the evaporative air-cooled condenser 23, so as to better ensure the sufficient heat dissipation of the evaporative air-cooled condenser 23 and improve the refrigeration effect of the refrigeration mode.

[0065] In an exemplary embodiment, as shown in Figures 1 to 3 a heat pump unit 10 is provided, as well as an air conditioner including the above-mentioned heat pump unit 10, and a control method applied to the heat pump unit 10. In this embodiment, the opening degree of the first bypass valve 41 is adjustable. The initial opening degree of the first bypass valve 41 is the first set opening degree. When the first bypass valve 41 is in the conducting state, the opening degree of the first bypass valve 41 is adjusted based on the first current heat dissipation amount of the air-cooled condenser 13 and the second current heat dissipation amount of the evaporative air-cooled condenser 23.

[0066] That is to say, when it is determined that the heat pump unit 10 is in the refrigeration mode, and when the outdoor wet-bulb temperature is greater than or equal to the wet-bulb temperature threshold, and the outdoor dry-bulb temperature is greater than the dry-bulb temperature threshold, when it is necessary to control the first bypass valve 41 to conduct, the control device can first control the first bypass valve 41 to conduct with the first set opening degree as the initial opening degree, and then, every first set time interval, based on the first current heat dissipation amount Q1 of the air-cooled condenser 13 and the second current heat dissipation amount Q2 of the evaporative air-cooled condenser 23, adjust the opening degree of the first bypass valve 41.

[0067] Among them, when both the series flow path and the first bypass flow path 4 are in the conducting state, and both the evaporative air-cooled condenser 23 and the air-cooled condenser 13 are in the operating state, every first set time period t1, the first outlet air temperature t1_out1 of the air-cooled condenser 13 is detected by the first outlet air temperature sensor 101, and the second outlet air temperature t1_out2 of the evaporative air-cooled condenser 23 is detected by the second outlet air temperature sensor 103. The first inlet air temperature t1_in1 of the air-cooled condenser 13 is detected by the first inlet air temperature sensor 102, and the second inlet air temperature t1_in2 of the evaporative air-cooled condenser 23 is detected by the second inlet air temperature sensor 104. At the same time, the first frequency f1 of the first fan 131 of the air-cooled condenser 13 and the second frequency f2 of the second fan 231 of the evaporative air-cooled condenser 23 can be detected, and the first air volume q1 of the first fan 131 and the second air volume q2 of the second fan 231 are obtained according to the air volume corresponding to the fan frequency. Then, according to the heat dissipation Q = c * q * ρ * (t1_out - t1_in), the first current heat dissipation Q1 of the air-cooled condenser 13 and the second current heat dissipation Q2 of the evaporative air-cooled condenser 23 are calculated. Where c: specific heat capacity of air, 0.927 kJ / kg*K; q: air volume; ρ: density; t1_out: outlet air temperature of the condenser; t1_in: inlet air temperature of the condenser.

[0068] Among them, a lower limit value W of the heat dissipation ratio and an upper limit value S of the heat dissipation ratio can be preset in the air conditioner of this embodiment. If W ≤ Q2 / (Q1 + Q2) ≤ S, the opening degree of the first bypass valve 41 is controlled to maintain the current state. After the first set time period t1, the corresponding data is detected again, and then the judgment is made again; if Q2 / (Q1 + Q2) < W, the opening degree of the first bypass valve 41 is controlled to be increased by a second set opening degree. After the first set time period t1, the corresponding data is detected again, and then the judgment is made again; if Q2 / (Q1 + Q2) > S, the opening degree of the first bypass valve 41 is controlled to be decreased by a third set opening degree. After the first set time period t1, the corresponding data is detected again, and then the judgment is made again. This process is repeated until the opening degree of the first bypass valve 41 reaches the maximum opening degree or the first bypass valve 41 is closed.

[0069] It should be noted that the above first set opening degree, second set opening degree, and third set opening degree can be the same or different, and no limitation is made in this regard. And no limitation is made on the specific opening degree value, which can be set according to actual needs. The first set time period can also be set according to actual needs, and no limitation is made on its specific value.

[0070] In addition, in this embodiment, the first bypass flow path 4 includes a first check valve. The first check valve is located on the side of the first bypass valve 41 close to the intermediate flow path 3, and the outlet of the first check valve is located on the side of the first check valve close to the intermediate flow path 3. Based on this, when in the refrigeration mode, the reverse flow of the refrigerant in the first bypass flow path 4 can be avoided.

[0071] In this embodiment, a first bypass flow path 4 is provided with a first bypass valve 41 with adjustable opening. When the heat pump unit 10 is in the refrigeration mode, and when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is greater than the dry bulb temperature threshold, the opening of the first bypass valve 41 can be adjusted based on the first current heat dissipation of the air-cooled condenser 13 and the second current heat dissipation of the evaporative condenser 23, so as to perform reasonable refrigerant flow distribution, thereby ensuring that the evaporative condenser 23 is fully heat-exchanged and improving the refrigeration effect.

[0072] In an exemplary embodiment, referring to Figures 1 to 3 As shown, a heat pump unit 10 is provided, as well as an air conditioner including the above heat pump unit 10, and a control method applied to the heat pump unit 10. In this embodiment, when the heat pump unit 10 is in the refrigeration mode and the outdoor wet bulb temperature is less than the wet bulb temperature threshold, the first heat exchange flow path 1 is in a closed state, the first bypass flow path 4 and the second heat exchange flow path 2 are both in a conducting state, and the air-cooled condenser 13 is in a non-operating state, and the evaporative condenser 23 is in an operating state.

[0073] In addition, when the heat pump unit 10 of this embodiment includes a second bypass flow path 5, when the heat pump unit 10 is in the refrigeration mode and the outdoor wet bulb temperature is less than the wet bulb temperature threshold, the second bypass flow path 5 can be in a closed state.

[0074] Exemplarily, if the control device determines that the heat pump unit 10 is in the refrigeration mode and determines that the outdoor wet bulb temperature is less than the wet bulb temperature threshold, the first control valve 111 and the second control valve 121 can be controlled to be in a closed state, and the third control valve 211, the fourth control valve 221, and the first bypass valve 41 can be controlled to be in a conducting state, so that the first heat exchange flow path 1 is in a closed state, and the second heat exchange flow path 2 and the first bypass flow path 4 are in a conducting state.

[0075] When the heat pump unit 10 of this embodiment includes a second bypass flow path 5, the control device can make the second bypass flow path 5 in a closed state by controlling the second bypass valve 51 to be in a closed state.

[0076] It should be noted that during refrigeration, since the lower the outdoor wet bulb temperature, the better the heat exchange effect of the evaporative condenser 23. Therefore, in this embodiment, when the heat pump unit 10 is in the refrigeration mode and the outdoor wet bulb temperature is less than the wet bulb temperature threshold, only the evaporative condenser 23 can be used for heat exchange, so as to better ensure the refrigeration effect.

[0077] In addition, in this embodiment, when the heat pump unit 10 is in the refrigeration mode and the outdoor wet bulb temperature is lower than the wet bulb temperature threshold, the opening degree of the first bypass valve 41 can be controlled to the maximum opening degree, that is, the first bypass valve 41 can be controlled to be fully open, so as to better improve the heat exchange effect of the evaporative condenser 23, and further better improve the refrigeration effect of the entire heat pump unit 10.

[0078] In an exemplary embodiment, as shown in Figures 1 to 3 a heat pump unit 10, an air conditioner including the above heat pump unit 10, and a control method applied to the heat pump unit 10 are provided. In this embodiment, the heat pump unit 10 includes a second bypass flow path 5 corresponding to the second heat exchange flow path 2. The first end of the second bypass flow path 5 communicates with the second end of the intermediate flow path 3, and the second end of the second bypass flow path 5 communicates with the second refrigerant manifold 7.

[0079] Wherein, when the heat pump unit 10 is in the refrigeration mode, and when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is less than or equal to the dry bulb temperature threshold, both the first heat exchange flow path 1 and the second bypass flow path 5 are in a conducting state, the second heat exchange flow path 2 and the first bypass flow path 4 are in a closed state, and the air-cooled condenser 13 is in a working state, and the evaporative condenser 23 is in a non-working state.

[0080] Exemplarily, if the control device determines that the heat pump unit 10 is in the refrigeration mode, determines that the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold, and determines that the outdoor dry bulb temperature is less than or equal to the dry bulb temperature threshold, the first control valve 111, the second control valve 121, and the second bypass valve 51 can be controlled to be in a conducting state, and the third control valve 211, the fourth control valve 221, and the first bypass valve 41 can be controlled to be in a closed state, so that both the first heat exchange flow path 1 and the second bypass flow path 5 are in a conducting state, and the second heat exchange flow path 2 and the first bypass flow path 4 are in a closed state.

[0081] It should be noted that during refrigeration, the lower the outdoor wet bulb temperature, the better the heat exchange effect of the evaporative condenser 23, and the lower the outdoor dry bulb temperature, the better the heat exchange effect of the air-cooled condenser 13. Therefore, in this embodiment, when the heat pump unit 10 is in the refrigeration mode, and when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is less than or equal to the dry bulb temperature threshold, only the air-cooled condenser 13 is used for heat exchange, so as to better ensure the refrigeration effect.

[0082] In addition, when the heat pump unit 10 is in the cooling mode, and when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold, and the outdoor dry bulb temperature is less than or equal to the dry bulb temperature threshold, the control device can control the opening degree of the second bypass valve 51 to the maximum opening degree, that is, control the second bypass valve 51 to be fully open, so as to better improve the heat exchange effect of the air-cooled condenser 13, and further improve the cooling effect.

[0083] In an exemplary embodiment, as shown in Figures 1 to 3 Figure, a heat pump unit 10, an air conditioner including the above heat pump unit 10, and a control method applied to the heat pump unit 10 are provided. In this embodiment, when the heat pump unit 10 is in the cooling mode, when it is necessary to control the evaporative air-cooled condenser 23 to be in the working state, the evaporative air-cooled condenser 23 can be controlled to start with the third set frequency as the initial frequency; when it is necessary to control the air-cooled condenser 13 to be in the working state, the air-cooled condenser 13 can be controlled to start with the second set frequency as the initial frequency. The second set frequency and the third set frequency can be the same or different, and no limitation is made thereto. The second set frequency and the first set frequency in other embodiments can be the same or different, and no limitation is made thereto either.

[0084] When the air-cooled condenser is in the working state, the operating frequency of the first fan 131 of the air-cooled condenser can be adjusted based on the high-pressure of the air-cooled condenser 13. Among them, after controlling the air-cooled condenser 13 to be in the working state, every third set time interval, the high-pressure P is detected by the pressure sensor 105 in the intermediate flow path 3, and the target deviation from the target high-pressure P' is calculated: when ∣P - P'∣≥D, D is the high-pressure target deviation limit value, then the frequency of the first fan 131 can be adjusted according to the formula: frequency of the first fan 131 = second set frequency + b*(P - P'), where b is the fan frequency adjustment coefficient. After each frequency adjustment, the high-pressure can be detected again, and subsequent judgment and control can be performed. When ∣P - P'∣<D, the first fan 131 can be controlled to maintain the current state, that is, control the frequency of the first fan 131 to remain unchanged, and return to detect the high-pressure again, and perform subsequent judgment and control. This cycle continues until the frequency of the first fan 131 reaches the maximum frequency, then the frequency will no longer increase; or, until the first fan 131 is turned off, then the frequency will no longer decrease.

[0085] In addition, when the evaporative air-cooled condenser 23 is in operation, the operating frequency of the second fan 231 of the evaporative air-cooled condenser 23 can be adjusted based on the high-pressure of the evaporative air-cooled condenser 23. Among them, after controlling the evaporative air-cooled condenser 23 to be in operation, every fourth set time period, the high-pressure P is detected by the pressure sensor 105 in the intermediate flow path 3, and the target deviation from the target high-pressure P' is calculated: when ∣P - P'∣≥D, where D is the limit value of the high-pressure target deviation, the frequency of the second fan 231 can be adjusted according to the formula: frequency of the second fan 231 = third set frequency + b*(P - P'), where b is the fan frequency adjustment coefficient. After each frequency adjustment, the high-pressure can be detected again, and subsequent judgment and control can be carried out. When ∣P - P'∣<D, the second fan 231 can be controlled to maintain the current state, that is, the frequency of the second fan 231 remains unchanged, and the high-pressure is detected again, and subsequent judgment and control are carried out. This process is repeated until the frequency of the second fan 231 reaches the maximum frequency, then the frequency is no longer increased; or until the second fan 231 is turned off, then the frequency is no longer decreased.

[0086] It should be noted that the third time period and the fourth time period in this embodiment can be set according to actual needs, and there is no limitation in this regard. In addition, the third time period and the fourth time period can be the same or different, and there is no limitation in this regard.

[0087] In this embodiment, in the refrigeration mode, when the air-cooled condenser 13 is in operation, the frequency of the first fan 131 is adjusted by the high-pressure, which can better improve the heat exchange effect of the air-cooled condenser 13; when the evaporative air-cooled condenser 23 is in operation, the frequency of the first fan 131 is adjusted by the high-pressure, which can better improve the heat exchange effect of the evaporative air-cooled condenser 23. Based on this, this embodiment can better improve the refrigeration effect of the entire heat pump unit 10 and enhance the user experience.

[0088] In an exemplary embodiment, refer to Figures 1 to 3 As shown, a heat pump unit 10, an air conditioner including the above heat pump unit 10, and a control method applied to the heat pump unit 10 are provided. In this embodiment, the air conditioner may include an electronic expansion valve 20, a shell-and-tube heat exchanger 30, a compressor 40, and a four-way valve 50. The electronic expansion valve 20 is provided between the second refrigerant main port 7 and the refrigerant passage of the shell-and-tube heat exchanger 30, and the four-way valve 50 is provided between the first refrigerant main port 6 and the compressor 40. This air conditioner can be used to implement the control method in the above embodiment, so as to achieve better refrigeration and heating effects and enhance the user experience.

[0089] Those skilled in the art should also be further aware that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0090] It should be noted that the phrases "one embodiment", "embodiment", "exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Moreover, when combining specific features, structures, or characteristics with an embodiment, it is within the knowledge scope of those skilled in the art to implement such features, structures, or characteristics in combination with other embodiments, whether explicitly or implicitly described.

[0091] It should be noted that in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including", or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or air conditioning device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article, or air conditioning device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article, or air conditioning device including the said element.

[0092] The above embodiments are only the preferred embodiments given to fully illustrate this application, and the protection scope of this application is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of this application are all within the protection scope of this application.

Claims

1. A heat pump unit, characterized in that, The heat pump unit includes a first refrigerant main port, a second refrigerant main port, and a series flow path. The series flow path includes a first heat exchange flow path, an intermediate flow path, and a second heat exchange flow path connected in series. The first end of the first heat exchange flow path is communicated with the first refrigerant main port, the second end of the first heat exchange flow path is communicated with the first end of the intermediate flow path, the first end of the second heat exchange flow path is communicated with the second end of the intermediate flow path, the second end of the second heat exchange flow path is communicated with the second refrigerant main port. The first heat exchange flow path includes an air-cooled condenser, and the second heat exchange flow path includes an evaporative air-cooled condenser; The heat pump unit includes a first bypass flow path corresponding to the first heat exchange flow path. The first refrigerant main port is communicated with the first end of the first bypass flow path, and the first end of the intermediate flow path is communicated with the second end of the first bypass flow path; Wherein, when the heat pump unit is in the refrigeration mode, and when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is greater than the dry bulb temperature threshold, both the series flow path and the first bypass flow path are in the conducting state, and both the evaporative air-cooled condenser and the air-cooled condenser are in the working state.

2. The heat pump unit according to claim 1, characterized in that, The first heat exchange flow path includes a first flow path and a second flow path, the second heat exchange flow path includes a third flow path and a fourth flow path. The first end of the first flow path is communicated with the first refrigerant main port, the first refrigerant port of the air-cooled condenser is communicated with the second end of the first flow path, the second refrigerant port of the air-cooled condenser is communicated with the first end of the second flow path, the second end of the second flow path is communicated with the first end of the intermediate flow path, the second end of the intermediate flow path is communicated with the first end of the third flow path, the third refrigerant port of the evaporative air-cooled condenser is communicated with the second end of the third flow path, the fourth refrigerant port of the evaporative air-cooled condenser is communicated with the first end of the fourth flow path, and the second end of the fourth flow path is communicated with the second refrigerant main port; The first flow path includes a first control valve, the second flow path includes a second control valve, the third flow path includes a third control valve, the fourth flow path includes a fourth control valve, and the first bypass flow path includes a first bypass valve; Wherein, when the heat pump unit is in the refrigeration mode, and when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is greater than the dry bulb temperature threshold, the first control valve, the second control valve, the third control valve, the fourth control valve, and the first bypass valve are all in the conducting state.

3. The heat pump unit according to claim 2, characterized in that, The opening degree of the first bypass valve is adjustable. The initial opening degree of the first bypass valve is a first set opening degree. When the first bypass valve is in the conducting state, every first set time interval, based on the first current heat dissipation amount of the air-cooled condenser and the second current heat dissipation amount of the evaporative air-cooled condenser, the opening degree of the first bypass valve is adjusted.

4. The heat pump unit according to claim 2, characterized in that, The heat pump unit includes a second bypass flow path corresponding to the second heat exchange flow path. The first end of the second bypass flow path is communicated with the second end of the intermediate flow path, and the second end of the second bypass flow path is communicated with the second refrigerant main port; Among them, when the heat pump unit is in the cooling mode, when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is less than or equal to the dry bulb temperature threshold, both the first heat exchange flow path and the second bypass flow path are in the conducting state, the second heat exchange flow path and the first bypass flow path are in the closed state, and the air-cooled condenser is in the working state while the evaporative-cooled condenser is in the non-working state.

5. The heat pump unit according to claim 4, wherein The second bypass flow path includes a second bypass valve, and the second bypass valve is used to control the conducting state and the closed state of the second bypass flow path.

6. The heat pump unit according to claim 4, characterized in that, When the heat pump unit is in the heating mode, the first bypass flow path and the second heat exchange flow path are in the closed state, the first heat exchange flow path and the second bypass flow path are in the conducting state, and the air-cooled condenser is in the working state while the evaporative-cooled condenser is in the non-working state.

7. The heat pump unit according to any one of claims 1-6, characterized in that, When the heat pump unit is in the cooling mode and the outdoor wet bulb temperature is less than the wet bulb temperature threshold, the first heat exchange flow path is in the closed state, both the first bypass flow path and the second heat exchange flow path are in the conducting state, and the air-cooled condenser is in the non-working state while the evaporative-cooled condenser is in the working state.

8. An air conditioner, characterized in that, The air conditioner includes the heat pump unit according to any one of claims 1-7.

9. A control method, characterized in that, The control method is applied to the heat pump unit according to any one of claims 1-7, and the control method includes: When the heat pump unit is in the cooling mode, and when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is greater than the dry bulb temperature threshold, control both the series flow path and the first bypass flow path of the heat pump unit to be in the conducting state, and control both the air-cooled condenser and the evaporative-cooled condenser to be in the working state.

10. The control method according to claim 9, wherein The first bypass flow path includes a first bypass valve, and the control method includes: When the heat pump unit is in the cooling mode, and when the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold and the outdoor dry bulb temperature is greater than the dry bulb temperature threshold, control the first bypass valve to conduct with the first set opening as the initial opening, and every interval of the first set duration, adjust the opening of the first bypass valve based on the first current heat dissipation amount (Q1) of the air-cooled condenser and the second current heat dissipation amount (Q2) of the evaporative-cooled condenser.

11. The control method according to claim 10, wherein The adjusting the opening of the first bypass valve based on the first current heat dissipation amount (Q1) of the air-cooled condenser and the second current heat dissipation amount (Q2) of the evaporative-cooled condenser includes: If Q2 / (Q1 + Q2) is greater than or equal to the lower limit value of the heat dissipation ratio and less than or equal to the upper limit value of the heat dissipation ratio, control the opening of the first bypass valve to maintain the current state.

12. The control method according to claim 10, wherein The adjusting the opening of the first bypass valve based on the first current heat dissipation amount (Q1) of the air-cooled condenser and the second current heat dissipation amount (Q2) of the evaporative-cooled condenser includes: If Q2 / (Q1 + Q2) is less than the lower limit value of the heat dissipation ratio, increase the opening of the first bypass valve by the second set opening until the opening of the first bypass valve reaches the maximum opening.

13. The control method according to claim 10, characterized in that, Adjusting the opening degree of the first bypass valve based on the first current heat dissipation amount (Q1) of the air-cooled condenser and the second current heat dissipation amount (Q2) of the evaporative air-cooled condenser includes: If Q2 / (Q1+Q2) is greater than the upper limit value of the heat dissipation ratio, lower the opening degree of the first bypass valve by a third set opening degree until the first bypass valve is closed.

14. The control method according to claim 9, wherein The control method includes: When the heat pump unit is in the cooling mode and the outdoor wet bulb temperature is less than the wet bulb temperature threshold, control the first heat exchange flow path of the heat pump unit to be in the closed state, and control both the first bypass flow path and the second heat exchange flow path to be in the conducting state, and control the evaporative air-cooled condenser to be in the working state, and control the air-cooled condenser to be in the non-working state.

15. The control method according to claim 14, wherein The first bypass flow path includes a first bypass valve, and the control method includes: When the heat pump unit is in the cooling mode and the outdoor wet bulb temperature is less than the wet bulb temperature threshold, control the opening degree of the first bypass valve to be the maximum opening degree.

16. The control method according to claim 9, characterized in that, The heat pump unit includes a second bypass flow path, and the control method includes: When the heat pump unit is in the cooling mode, and the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold, and the outdoor dry bulb temperature is less than or equal to the dry bulb temperature threshold, control both the first heat exchange flow path and the second bypass flow path to be in the conducting state, and control both the second heat exchange flow path and the first bypass flow path to be in the closed state, and control the air-cooled condenser to be in the working state, and control the evaporative air-cooled condenser to be in the non-working state.

17. The control method according to claim 16, wherein The second bypass flow path includes a second bypass valve, and the control method includes: When the heat pump unit is in the cooling mode, and the outdoor wet bulb temperature is greater than or equal to the wet bulb temperature threshold, and the outdoor dry bulb temperature is less than or equal to the dry bulb temperature threshold, control the opening degree of the second bypass valve to be the maximum opening degree.

18. The control method according to claim 16, wherein The control method includes: When the heat pump unit is in the heating mode, control both the first heat exchange flow path and the second bypass flow path to be in the conducting state, and control both the first bypass flow path and the second heat exchange flow path to be in the closed state, and control the evaporative air-cooled condenser to be in the non-working state, and control the air-cooled condenser to be in the working state.

19. The control method according to claim 18, wherein, The control method includes: When the heat pump unit is in the heating mode, adjust the operating frequency of the first fan of the air-cooled condenser based on the liquid outlet temperature of the shell-and-tube heat exchanger of the air conditioner and the set temperature threshold.

20. The control method according to any one of claims 9-19, characterized in that, The control method includes: When the heat pump unit is in the cooling mode and the evaporative air-cooled condenser is in the working state, adjust the operating frequency of the second fan of the evaporative air-cooled condenser based on the high pressure of the evaporative air-cooled condenser.

21. The control method according to any one of claims 9-19, characterized in that, The control method includes: When the heat pump unit is in the cooling mode and the air-cooled condenser is in the working state, adjust the operating frequency of the first fan of the air-cooled condenser based on the high pressure of the air-cooled condenser.

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