Heat pump unit, air conditioner and control method

Abstract

The present disclosure provides a heat pump unit, an air conditioner, and a control method. When the heat pump unit is in cooling mode, and 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. That is, a portion of the refrigerant is used to exchange heat through the series flow path, which is first connected in series with an air-cooled condenser and then in series with an evaporative condenser, while another portion of the refrigerant is used to bypass the air-cooled condenser and directly enter the evaporative condenser for heat exchange. This allows the evaporative condenser to more fully participate in heat exchange, thereby improving the energy efficiency of the entire heat pump unit and enhancing the user's cooling experience.

Description

Technical Field

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

[0002] Conventional heat pump units are only equipped with evaporative cooling condensers, which have only summer cooling function and lack winter heating function. The reason is that the outdoor temperature in winter is often below zero degrees Celsius, the spray water freezes, and the evaporative cooling condenser has poor heat exchange effect as an evaporator.

[0003] Some related technologies use a heat pump unit that combines an evaporative cooling condenser with an air-cooled condenser to address the winter heating problem of the evaporative cooling condenser. However, when the heat pump unit is cooling in the summer, if the air-cooled condenser is connected in series first and then the evaporative cooling condenser, the evaporative cooling condenser will not heat up sufficiently, resulting in poor energy efficiency. Summary of the Invention

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

[0005] According to a first aspect of an embodiment of the present disclosure, a heat pump unit is provided, the heat pump unit comprising a first refrigerant main port, a second refrigerant main port, and a series flow path, the series flow path comprising 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 being in communication with the first refrigerant main port, a second end of the first heat exchange flow path being in communication with the first end of the intermediate flow path, a first end of the second heat exchange flow path being in communication with the second end of the intermediate flow path, a second end of the second heat exchange flow path being in communication with the second refrigerant main port, the first heat exchange flow path comprising an air-cooled condenser, and the second heat exchange flow path comprising an evaporative cooling condenser;

[0006] The heat pump unit includes a first bypass flow path corresponding to the first heat exchange flow path, the first refrigerant main port is connected to the first end of the first bypass flow path, and the first end of the intermediate flow path is connected to the second end of the first bypass flow path;

[0007] Among them, when the heat pump unit is in 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, the series flow path and the first bypass flow path are both in a conducting state, and the evaporative cooling condenser and the air-cooled condenser are both in a working state.

[0008] 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, 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 cooling condenser is communicated with the second end of the third flow path, the fourth refrigerant port of the evaporative cooling 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;

[0009] 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;

[0010] Among them, when the heat pump unit is in 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 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 on state.

[0011] In an optional embodiment, the opening size of the first bypass valve is adjustable, and the initial opening of the first bypass valve is a first set opening. When the first bypass valve is in a conducting state, the opening of the first bypass valve is adjusted at intervals of a first set time based on a first current heat dissipation of the air-cooled condenser and a second current heat dissipation of the evaporative cooling condenser.

[0012] 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 connected to the second end of the intermediate flow path, and a second end of the second bypass flow path is connected to the second refrigerant main port;

[0013] Among them, when the heat pump unit is in 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, the first heat exchange flow path and the second bypass flow path are both in a conducting state, the second heat exchange flow path and the first bypass flow path are in a closed state, the air-cooled condenser is in a working state, and the evaporative cooling condenser is in a non-working state.

[0014] In an optional embodiment, the second bypass flow path includes a second bypass valve, and the second bypass valve is used to control the on state and the off state of the second bypass flow path.

[0015] In an optional embodiment, when the heat pump unit is in 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 connected state, the air-cooled condenser is in a working state, and the evaporative cooling condenser is in a non-working state.

[0016] In an optional embodiment, when the heat pump unit is in 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, the air-cooled condenser is in a non-working state, and the evaporative cooling condenser is in a working state.

[0017] According to a second aspect of an embodiment of the present disclosure, an air conditioner is provided, comprising a heat pump unit as described in any one of the first aspects.

[0018] According to a third aspect of an embodiment of the present disclosure, a control method is provided. The control method is applied to the heat pump unit according to any one of the first aspects, and the control method includes:

[0019] When the heat pump unit is in 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, the series flow path and the first bypass flow path of the heat pump unit are controlled to be in a conducting state, and the air-cooled condenser and the evaporative cooling condenser are controlled to be in a working state.

[0020] In an optional embodiment, the first bypass flow path includes a first bypass valve, and the control method includes:

[0021] When the heat pump unit is in cooling 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, the first bypass valve is controlled to be turned on with a first set opening as an initial opening, and the opening of the first bypass valve is adjusted at intervals of a first set time based on a first current heat dissipation (Q1) of the air-cooled condenser and a second current heat dissipation (Q2) of the evaporative cooling condenser.

[0022] In an optional embodiment, adjusting the opening of the first bypass valve based on the first current heat dissipation (Q1) of the air-cooled condenser and the second current heat dissipation (Q2) of the evaporative cooling condenser includes:

[0023] If Q2 / (Q1+Q2) is greater than or equal to the lower limit of the heat dissipation ratio and less than or equal to the upper limit of the heat dissipation ratio, the opening of the first bypass valve is controlled to maintain the current state.

[0024] In an optional embodiment, adjusting the opening of the first bypass valve based on the first current heat dissipation (Q1) of the air-cooled condenser and the second current heat dissipation (Q2) of the evaporative cooling condenser includes:

[0025] If Q2 / (Q1+Q2) is less than the lower limit of the heat dissipation ratio, the opening of the first bypass valve is increased by a second set opening until the opening of the first bypass valve reaches the maximum opening.

[0026] In an optional embodiment, adjusting the opening of the first bypass valve based on the first current heat dissipation (Q1) of the air-cooled condenser and the second current heat dissipation (Q2) of the evaporative cooling condenser includes:

[0027] If Q2 / (Q1+Q2) is greater than the upper limit of the heat dissipation ratio, the opening of the first bypass valve is adjusted down to a third set opening until the first bypass valve is closed.

[0028] In an optional embodiment, the control method includes:

[0029] When the heat pump unit is in cooling mode and the outdoor wet-bulb temperature is lower than the wet-bulb temperature threshold, the first heat exchange flow path of the heat pump unit is controlled to be in a closed state, the first bypass flow path and the second heat exchange flow path are controlled to be in a conducting state, the evaporative cooling condenser is controlled to be in a working state, and the air-cooled condenser is controlled to be in a non-working state.

[0030] In an optional embodiment, the first bypass flow path includes a first bypass valve, and the control method includes:

[0031] When the heat pump unit is in cooling mode and the outdoor wet-bulb temperature is less than the wet-bulb temperature threshold, the opening of the first bypass valve is controlled to be the maximum opening.

[0032] In an optional embodiment, the heat pump unit includes a second bypass flow path, and the control method includes:

[0033] When the heat pump unit is in 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, the first heat exchange flow path and the second bypass flow path are controlled to be in a conducting state, and the second heat exchange flow path and the first bypass flow path are controlled to be in a closed state, and the air-cooled condenser is controlled to be in a working state, and the evaporative cooling condenser is controlled to be in a non-working state.

[0034] In an optional embodiment, the second bypass flow path includes a second bypass valve, and the control method includes:

[0035] When the heat pump unit is in 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, the opening of the second bypass valve is controlled to be maximum.

[0036] In an optional embodiment, the control method includes:

[0037] When the heat pump unit is in heating mode, the first heat exchange flow path and the second bypass flow path are controlled to be in a conducting state, and the first bypass flow path and the second heat exchange flow path are controlled to be in a closed state, and the evaporative cooling condenser is controlled to be in a non-working state, and the air-cooled condenser is controlled to be in a working state.

[0038] In an optional embodiment, the control method includes:

[0039] When the heat pump unit is in heating mode, the operating frequency of the first fan of the air-cooled condenser is adjusted based on the outlet liquid temperature of the shell and tube heat exchanger of the air conditioner and a set temperature threshold.

[0040] In an optional embodiment, the control method includes:

[0041] When the heat pump unit is in cooling mode and the evaporative cooling condenser is in working state, the operating frequency of the second fan of the evaporative cooling condenser is adjusted based on the high pressure of the evaporative cooling condenser.

[0042] In an optional embodiment, the control method includes:

[0043] When the heat pump unit is in cooling mode and the air-cooled condenser is in operation, the operating frequency of the first fan of the air-cooled condenser is adjusted based on the high pressure of the air-cooled condenser.

[0044] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: In the present disclosure, the 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 cooling condenser. The first heat exchange flow path, the intermediate flow path, and the second heat exchange flow path are connected in sequence, and the first end of the first heat exchange flow path is connected to the first refrigerant main port of the heat pump unit, and the second end of the second heat exchange flow path is connected to the second refrigerant main port, thereby forming a series flow path, that is, the series flow path includes an air-cooled condenser and an evaporative cooling condenser in series. In addition, the heat pump unit is also provided with a first bypass flow path corresponding to the first heat exchange flow path, and the first end of the first bypass flow path and the first bypass flow path are connected in parallel with the first heat exchange flow path in the heat pump unit. When the heat pump unit is in 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 greater than the dry-bulb temperature threshold, the series flow path and the first bypass flow path are both in a conducting state. In other words, 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 a conducting state, and the evaporative cooling condenser and the air-cooled condenser are both in an operating state. In this case, part of the refrigerant in the heat pump unit can be heat-exchanged through the series-connected air-cooled condenser and the evaporative cooling condenser, while the remaining refrigerant can bypass the air-cooled condenser and directly exchange heat with the evaporative cooling condenser. Because the lower the outdoor wet-bulb temperature, the better the heat exchange effect of the evaporative cooling condenser, and the lower the outdoor dry-bulb temperature, the better the heat exchange effect of the air-cooled condenser, and the evaporative cooling condenser uses spray water evaporation for heat exchange, and its heat exchange energy efficiency is greater than that of the air-cooled condenser. Therefore, when the outdoor wet-bulb temperature and the outdoor dry-bulb temperature are both high, the present invention adopts a series flow path of part of the refrigerant to perform heat exchange through the series connection of the air-cooled condenser and then the evaporative cooling condenser, and simultaneously adopts another part of the refrigerant to cross the air-cooled condenser and directly enter the evaporative cooling condenser for heat exchange, so that the evaporative cooling condenser can participate in the heat exchange more fully, thereby improving the energy efficiency of the entire heat pump unit and improving the user's cooling experience.

[0045] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0048] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications 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 figures in the drawings do not constitute proportional limitations.

[0049] Figure 1 FIG. 1 is a flow path diagram of a heat pump unit according to an exemplary embodiment.

[0050] Figure 2 FIG. 1 is a flow path diagram of an air conditioner according to an exemplary embodiment.

[0051] Figure 3 The figure is a schematic diagram showing a method for controlling a heat pump unit in a cooling mode according to an exemplary embodiment.

[0052] Figure 4 FIG. 4 is a schematic diagram showing a method for controlling a heat pump unit in a heating mode according to an exemplary embodiment.

[0053] in:

[0054] 1. First heat exchange 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 path; 21. Third flow path; 211. Third control valve; 22. Fourth flow path; 221. Fourth control valve; 23. Evaporative cooling 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

[0055] 10. Heat pump unit; 20. Electronic expansion valve; 30. Shell and tube heat exchanger; 40. Compressor; 50. Four-way valve;

[0056] 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 DESCRIPTION

[0057] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0058] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0059] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0060] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. Therefore, the illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0061] The following will describe the embodiments of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand the other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways 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 the purpose of illustrating the present application and are not intended to limit the scope of protection of the present application.

[0062] In order to solve the technical problem in the prior art that a heat pump unit that first connects an air-cooled condenser in series and then connects an evaporative cooling condenser in series suffers from insufficient heat exchange during summer cooling, 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.

[0063] In the present disclosure, a heat pump unit may include a series flow path, which 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 cooling condenser. The first heat exchange flow path, the intermediate flow path, and the second heat exchange flow path are connected in sequence, and the first end of the first heat exchange flow path is connected to the first refrigerant main port of the heat pump unit, and the second end of the second heat exchange flow path is connected to the second refrigerant main port, thereby forming a series flow path, that is, the series flow path includes an air-cooled condenser and an evaporative cooling condenser in series. In addition, the heat pump unit is further provided with a first bypass flow path corresponding to the first heat exchange flow path, and 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 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 greater than the dry-bulb temperature threshold, the series flow path and the first bypass flow path are both in a conducting state. In other words, 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 a conducting state, and the evaporative cooling condenser and the air-cooled condenser are both in an operating state. In this case, part of the refrigerant in the heat pump unit can be heat-exchanged through the series-connected air-cooled condenser and the evaporative cooling condenser, while the remaining refrigerant can bypass the air-cooled condenser and directly exchange heat with the evaporative cooling condenser. Because the lower the outdoor wet-bulb temperature, the better the heat exchange effect of the evaporative cooling condenser, and the lower the outdoor dry-bulb temperature, the better the heat exchange effect of the air-cooled condenser, and the evaporative cooling condenser uses spray water evaporation for heat exchange, and its heat exchange energy efficiency is greater than that of the air-cooled condenser. Therefore, when the outdoor wet-bulb temperature and the outdoor dry-bulb temperature are both high, the present invention adopts a series flow path of part of the refrigerant to perform heat exchange through the series connection of the air-cooled condenser and then the evaporative cooling condenser, and simultaneously adopts another part of the refrigerant to cross the air-cooled condenser and directly enter the evaporative cooling condenser for heat exchange, so that the evaporative cooling condenser can participate in the heat exchange more fully, thereby improving the energy efficiency of the entire heat pump unit and improving the user's cooling experience.

[0064] In one exemplary embodiment, reference Figures 1 to 3 As shown, a heat pump unit 10, an air conditioner including the heat pump unit 10, and a control method for the heat pump unit 10 are provided. In this embodiment, the heat pump unit 10 includes a first refrigerant main port 6, a second refrigerant main port 7, and a series flow path. In cooling mode, the first refrigerant main port 6 serves as the refrigerant inlet of the heat pump unit 10, and the second refrigerant main port 7 serves as the refrigerant outlet of the heat pump unit 10.

[0065] The series flow path includes a first heat exchange flow path 1, an intermediate flow path 3, and a second heat exchange flow path 2 connected in series. 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 cooling condenser 23, that is, the second heat exchange flow path 2 is the heat exchange flow path of the evaporative cooling condenser 23.

[0066] The first end of the first heat exchange flow path 1 is connected to the first refrigerant main port 6, the second end of the first heat exchange flow path 1 is connected to the first end of the intermediate flow path 3, the first end of the second heat exchange flow path 2 is connected to the second end of the intermediate flow path 3, and the second end of the second heat exchange flow path 2 is connected to the second refrigerant main port 7. When the heat pump unit 10 is in cooling mode, the first refrigerant main port 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 to the second heat exchange flow path 2, and then transmitted to the outside of the heat pump unit 10 through the second refrigerant main port 7.

[0067] The heat pump unit 10 may include a first bypass flow path 4 corresponding to the first heat exchange flow path 1. The first refrigerant main port 6 is connected to the first end of the first bypass flow path 4, and the first end of the intermediate flow path 3 is connected to the second end of the first bypass flow path 4. In other words, the first bypass flow path 4 is connected in parallel with the first heat exchange flow path 1, and can divert the refrigerant transmitted from the first refrigerant main port 6 to the heat pump unit 10.

[0068] When the heat pump unit 10 is in cooling mode and both the outdoor wet-bulb temperature Twet and the outdoor dry-bulb temperature Tdry are high, that is, 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, the series flow path and the first bypass flow path 4 are both in a conducting state, and the evaporative cooling condenser 23 and the air-cooled condenser 13 are both in an operating state. In other words, 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 a conducting state, and the evaporative cooling condenser 23 and the air-cooled condenser 13 are both in an operating state.

[0069] The heat pump unit 10 may include a control device, which may determine the mode of the heat pump unit 10 based on the current mode of the air conditioner. For example, if the air conditioner is in cooling mode, the heat pump unit 10 is considered to be in cooling mode. In addition, the control device may also obtain the outdoor wet-bulb temperature and the outdoor dry-bulb temperature, and may determine the size of the outdoor wet-bulb temperature and the wet-bulb temperature threshold, as well as the size of the outdoor dry-bulb temperature and the dry-bulb temperature threshold. When the control device determines that the heat pump unit 10 is in cooling 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 may control the series flow path and the first bypass flow path 4 of the heat pump unit 10 to be in a conducting state, and control the air-cooled condenser 13 and the evaporative cooling condenser 23 to be in an operating state.

[0070] It should be noted that, since the lower the outdoor wet-bulb temperature, the better the heat exchange effect of the evaporative cooling condenser 23, and the lower the outdoor dry-bulb temperature, the better the heat exchange effect of the air-cooled condenser 13, and the evaporative cooling condenser 23 adopts spray water evaporation heat exchange, 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 cooling mode, and when the outdoor wet-bulb temperature and the outdoor dry-bulb temperature are both high, that is, 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 in the heat pump unit 10 can be heat-exchanged through the series-connected air-cooled condenser 13 and the evaporative cooling condenser 23, and the other part of the refrigerant can bypass the air-cooled condenser 13 and directly exchange heat through the evaporative cooling condenser 23, so that the evaporative cooling condenser 23 can participate in heat exchange more fully, thereby improving the energy efficiency of the entire heat pump unit 10 and improving the user's cooling experience.

[0071] In one exemplary embodiment, reference Figures 1 to 4 As shown, a heat pump unit 10, an air conditioner including the heat pump unit 10, and a control method for the heat pump unit 10 are provided. This embodiment can further improve the above embodiment, wherein 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 connected to the second end of the intermediate flow path 3, and the second end of the second bypass flow path 5 is connected to the second refrigerant main port 7. In other words, in the heat pump unit 10, the second bypass flow path 5 is connected in parallel with the second heat exchange flow path 2.

[0072] Among them, when the heat pump unit 10 is in the heating mode, the control device can control the first heat exchange path 1 and the second bypass path 5 to be in the on state, and control the first bypass path 4 and the second heat exchange path 2 to be in the closed state, and control the air-cooled condenser 13 to be in the working state, and control the evaporative cooling condenser 23 to be in the non-working state.

[0073] It should be noted that since the evaporative cooling condenser 23 is prone to ice during heating in winter, in this embodiment, when the heat pump unit 10 is in heating mode, the air-cooled condenser 13 can be used for heat exchange heating, while the evaporative cooling condenser 23 is turned off, thereby better ensuring normal heating of the heat pump unit 10.

[0074] In this embodiment, the heat pump unit 10, which is composed of 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, and the second bypass flow path 5, can achieve heating using the air-cooled condenser 13 in the heating mode, thereby avoiding ice formation in the evaporative cooling condenser 23 and better ensuring the heating effect of the heat pump unit 10. In addition, in the cooling mode, when the outdoor wet-bulb temperature and the outdoor dry-bulb temperature are both high, a portion of the refrigerant first uses the air-cooled condenser 13 for heat exchange and cooling, and then uses the evaporative cooling condenser 23 for heat exchange and cooling, while the other portion of the refrigerant directly uses the evaporative cooling condenser 23 for heat exchange and cooling, thereby better ensuring sufficient heat dissipation of the evaporative cooling condenser 23 and improving the cooling effect in the cooling mode.

[0075] That is to say, the heat pump unit 10 of this embodiment can use the air-cooled condenser 13 for heating, and can also use the air-cooled condenser 13 and the evaporative cooling condenser 23 for cooling at the same time, and can better ensure that the evaporative cooling condenser 23 dissipates heat sufficiently during cooling, thereby improving the cooling effect.

[0076] In addition, in this embodiment, the air conditioner may include a shell and tube heat exchanger 30, which includes a refrigerant passage and a hot water passage. When the heat pump unit 10 is in heating mode, the refrigerant outlet of the shell and tube heat exchanger 30 is connected to the first refrigerant main port 6.

[0077] When the heat pump unit 10 is in 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 path of the air conditioner's shell and tube heat exchanger 30 and a set temperature threshold. An outlet water temperature sensor 106 can be provided on the outlet water pipeline of the shell and tube heat exchanger 30 to detect the outlet water temperature.

[0078] In some embodiments, reference Figure 1 、 Figure 2 and Figure 4As shown, when the heat pump unit 10 is in 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 a conducting state, and control the third control valve 211, the fourth control valve 221, and the first bypass valve 41 to be in a closed state, with the second bypass valve 51 in a fully open state. The control device can also control the second fan 231 to be in an inoperative state (i.e., in an OFF state), control the first fan 131 to be in an operative state, and control the first fan 131 to be turned on with the first set frequency X as the initial frequency. In this embodiment, after each second set time period, the outlet water temperature T1 of the shell and tube heat exchanger 30 is detected, and the difference between the outlet water temperature T1 and the set temperature threshold Tset is calculated. When |T1-Tset|≥A, where A is the outlet water temperature difference limit (which can be set according to actual needs), the frequency of the first fan 131 can be adjusted according to the formula: Frequency of the first fan 131 = Initial frequency X + a*(T1-Tset). Wherein, a is a constant that can be set according to actual needs and is not limited to this. When |T1-T is set to |<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 time, the water temperature can be re-detected and the above-mentioned judgment and control can be performed again. This cycle is repeated until the frequency of the first fan 131 is adjusted to the maximum value, at which point the frequency will no longer be increased; or until the first fan 131 is turned off, at which point the frequency will no longer be reduced.

[0079] In this embodiment, by properly adjusting the frequency of the first fan 131, the heat exchange effect of the heat pump unit 10 can be improved, thereby better ensuring the heating effect of the heat pump unit 10. It should be noted that in addition to adjusting the frequency of the first fan 131 in the above manner, it can also be adjusted in other ways, which are not limited to this.

[0080] In one exemplary embodiment, reference Figures 1 to 3 As shown, a heat pump unit 10, an air conditioner including the heat pump unit 10, and a control method for 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.

[0081] Among them, the first end of the first flow path 11 is connected to the first refrigerant main port 6, the first refrigerant port of the air-cooled condenser 13 is connected to the second end of the first flow path 11, the second refrigerant port of the air-cooled condenser 13 is connected to the first end of the second flow path 12, the second end of the second flow path 12 is connected to the first end of the intermediate flow path 3, the second end of the intermediate flow path 3 is connected to the first end of the third flow path 21, the third refrigerant port of the evaporative cooling condenser 23 is connected to the second end of the third flow path 21, the fourth refrigerant port of the evaporative cooling condenser 23 is connected to the first end of the fourth flow path 22, and the second end of the fourth flow path 22 is connected to the second refrigerant main port 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 cooling condenser 23, and the fourth flow path 22 constitute a series flow path of the heat pump unit 10.

[0082] The first flow path 11, the second flow path 12, the third flow path 21, and the fourth flow path 22 can each be provided with a control valve for controlling the opening and closing of the corresponding flow path. For 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 valves in this embodiment can be stop valves or other valve types, without limitation.

[0083] In addition, the first bypass flow path 4 may include a first bypass valve 41. When the heat pump unit 10 is in 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 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 an open state, so that the series flow path and the first bypass flow path 4 are both in an open state.

[0084] That is, in this embodiment, the conduction and closing 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 conduction and closing of the first bypass flow path 4 can be controlled by the first bypass valve 41.

[0085] The control device of the heat pump unit 10 can be electrically connected to 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. When the heat pump unit 10 is determined to be in 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 greater than the dry-bulb temperature threshold, the control device can control 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 to be in a conducting state, thereby ensuring that both the series flow path and the first bypass flow path 4 are in a conducting state. Simultaneously, the control device can control both the evaporative cooling condenser 23 and the air-cooled condenser 13 to be in an operating state. In this case, a portion of the refrigerant first uses the air-cooled condenser 13 for heat exchange and cooling, and then uses the evaporative cooling condenser 23 for heat exchange and cooling. The remaining portion of the refrigerant directly uses the evaporative cooling condenser 23 for heat exchange and cooling, thereby better ensuring sufficient heat dissipation from the evaporative cooling condenser 23 and improving the cooling effect in cooling mode.

[0086] In one exemplary embodiment, reference Figures 1 to 3 As shown, a heat pump unit 10, an air conditioner including the heat pump unit 10, and a control method for the heat pump unit 10 are provided. In this embodiment, the opening of the first bypass valve 41 is adjustable. The initial opening of the first bypass valve 41 is a first set opening. When the first bypass valve 41 is in the open state, the opening of the first bypass valve 41 is adjusted based on the first current heat dissipation of the air-cooled condenser 13 and the second current heat dissipation of the evaporative cooling condenser 23.

[0087] That is to say, when it is determined that the heat pump unit 10 is in 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, when it is necessary to control the first bypass valve 41 to be opened, the control device can first control the first bypass valve 41 to be opened with a first set opening as the initial opening, and then, at every first set time interval, based on the first current heat dissipation Q1 of the air-cooled condenser 13 and the second current heat dissipation Q2 of the evaporative cooling condenser 23, adjust the opening of the first bypass valve 41.

[0088] Among them, when the series flow path and the first bypass flow path 4 are both in the conducting state, and the evaporative cooling condenser 23 and the air-cooled condenser 13 are both in the working state, at every first set time interval t1, the first outlet air temperature t1out1 of the air-cooled condenser 13 is detected by the first outlet air temperature sensor 101, and the second outlet air temperature t1out2 of the evaporative cooling condenser 23 is detected by the second outlet air temperature sensor 103, the first inlet air temperature t1in1 of the air-cooled condenser 13 is detected by the first inlet air temperature sensor 102, and the second inlet air temperature t1in2 of the evaporative cooling 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 cooling condenser 23 can be detected at this time, and the first air volume q1 of the first fan 131 and the second air volume q2 of the second fan 231 can be obtained according to the air volume corresponding to the fan frequency. Then, the first current heat dissipation Q1 of the air-cooled condenser 13 and the second current heat dissipation Q2 of the evaporative cooling condenser 23 are calculated according to heat dissipation Q = c*q*ρ*(t1out - t1in). Where c is the specific heat capacity of air, 0.927 kJ / kg*K; q is the air volume; ρ is the density; t1out is the condenser outlet air temperature; and t1in is the condenser inlet air temperature.

[0089] In this embodiment, the air conditioner can be pre-set with a lower limit value W and an upper limit value S for the heat dissipation ratio. If W ≤ Q2 / (Q1+Q2) ≤ S, the opening of the first bypass valve 41 is controlled to maintain its current state. After a first set time t1, the corresponding data is re-checked, and a new judgment is made. If Q2 / (Q1+Q2) < W, the opening of the first bypass valve 41 is controlled to increase by a second set opening. After a first set time t1, the corresponding data is re-checked, and a new judgment is made. If Q2 / (Q1+Q2) > S, the opening of the first bypass valve 41 is controlled to decrease by a third set opening. After a first set time t1, the corresponding data is re-checked, and a new judgment is made. This cycle repeats until the opening of the first bypass valve 41 reaches its maximum opening or the first bypass valve 41 is closed.

[0090] It should be noted that the first, second, and third set openings can be the same or different, and there is no limitation on this. Furthermore, there is no limitation on the specific opening values, and they can be set according to actual needs. The first set duration can also be set according to actual needs, and there is no limitation on its specific value.

[0091] In addition, in this embodiment, the first bypass flow path 4 includes a first check valve, which is located on the side of the first bypass valve 41 close to the intermediate flow path 3. Furthermore, the outlet of the first check valve is located on the side of the first check valve close to the intermediate flow path 3. Therefore, when in cooling mode, backflow of refrigerant in the first bypass flow path 4 can be prevented.

[0092] In this embodiment, the first bypass flow path 4 is provided with a first bypass valve 41 with adjustable opening. When the heat pump unit 10 is in 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 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 cooling condenser 23, so as to perform reasonable refrigerant flow distribution, thereby ensuring that the evaporative cooling condenser 23 is fully heat exchanged and the cooling effect is improved.

[0093] In one exemplary embodiment, reference Figures 1 to 3 As shown, a heat pump unit 10, an air conditioner including the heat pump unit 10, and a control method for the heat pump unit 10 are provided. In this embodiment, when the heat pump unit 10 is in cooling 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, the air-cooled condenser 13 is in a non-operating state, and the evaporative cooling condenser 23 is in an operating state.

[0094] In addition, when the heat pump unit 10 of this embodiment includes the second bypass flow path 5, when the heat pump unit 10 is in cooling mode and the outdoor wet-bulb temperature is lower than the wet-bulb temperature threshold, the second bypass flow path 5 may be in a closed state.

[0095] For example, if the control device determines that the heat pump unit 10 is in the cooling mode and determines that the outdoor wet-bulb temperature is less than the wet-bulb temperature threshold, the first heat exchange path 1 can be closed and the second heat exchange path 2 and the first bypass path 4 can be turned on by controlling the first control valve 111 and the second control valve 121 to be in the closed state and controlling the third control valve 211, the fourth control valve 221 and the first bypass valve 41 to be in the turned-on state.

[0096] When the heat pump unit 10 of this embodiment includes the second bypass flow path 5, the control device can close the second bypass flow path 5 by controlling the second bypass valve 51 to be in a closed state.

[0097] It should be noted that when cooling is performed, the lower the outdoor wet-bulb temperature is, the better the heat exchange effect of the evaporative cooling condenser 23 is. Therefore, this embodiment can only use the evaporative cooling condenser 23 for heat exchange when the heat pump unit 10 is in cooling mode and the outdoor wet-bulb temperature is lower than the wet-bulb temperature threshold, thereby better ensuring the cooling effect.

[0098] In addition, in this embodiment, when the heat pump unit 10 is in cooling mode and the outdoor wet-bulb temperature is lower than the wet-bulb temperature threshold, the opening of the first bypass valve 41 can be controlled to be the maximum opening, that is, the first bypass valve 41 can be controlled to be fully open, thereby better improving the heat exchange effect of the evaporative cooling condenser 23, and further better improving the cooling effect of the entire heat pump unit 10.

[0099] In one exemplary embodiment, reference Figures 1 to 3 As shown, a heat pump unit 10, an air conditioner including the heat pump unit 10, and a control method for 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 is connected to the second end of the intermediate flow path 3, and the second end of the second bypass flow path 5 is connected to the second refrigerant main port 7.

[0100] Among them, when the heat pump unit 10 is in 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, the first heat exchange flow path 1 and the second bypass flow path 5 are both 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 cooling condenser 23 is in a non-working state.

[0101] For example, if the control device determines that the heat pump unit 10 is in the cooling mode, and 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, then the first control valve 111, the second control valve 121 and the second bypass valve 51 can be controlled to be in the on state, and the third control valve 211, the fourth control valve 221 and the first bypass valve 41 can be controlled to be in the closed state, so that the first heat exchange path 1 and the second bypass path 5 are both in the on state, and the second heat exchange path 2 and the first bypass path 4 are in the closed state.

[0102] It should be noted that when cooling is performed, the lower the outdoor wet-bulb temperature, the better the heat exchange effect of the evaporative cooling 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 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, only the air-cooled condenser 13 is used for heat exchange, thereby better ensuring the cooling effect.

[0103] In addition, when the heat pump unit 10 is in 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, the control device can control the opening of the second bypass valve 51 to be the maximum opening, 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 thus improve the cooling effect.

[0104] In one exemplary embodiment, reference Figures 1 to 3 As shown, a heat pump unit 10, an air conditioner including the above-mentioned 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 cooling mode, when it is necessary to control the evaporative cooling condenser 23 to be in working state, the evaporative cooling condenser 23 can be controlled to be turned on with the third set frequency as the initial frequency; when it is necessary to control the air-cooled condenser 13 to be in working state, the air-cooled condenser 13 can be controlled to be turned on 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 there is no limitation on this. The second set frequency can be the same or different from the first set frequency of other embodiments, and there is no limitation on this.

[0105] When the air-cooled condenser is in operation, the operating frequency of the first fan 131 of the air-cooled condenser can be adjusted based on the high-pressure pressure of the air-cooled condenser 13. After the air-cooled condenser 13 is controlled to be in operation, the high-pressure pressure P is detected by the pressure sensor 105 of the intermediate flow path 3 at intervals of a third set time, and the target deviation from the target high-pressure pressure P' is calculated: when |P-P'|≥D, where D is the high-pressure pressure target deviation limit, 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 pressure can be re-detected, 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, the frequency of the first fan 131 is controlled to remain unchanged, and the high-pressure pressure can be re-detected, and subsequent judgment and control can be performed. This cycle repeats until the frequency of the first fan 131 reaches the maximum frequency, and then the frequency is no longer increased; or, until the first fan 131 is turned off, and then the frequency is no longer reduced.

[0106] Additionally, when the evaporative cooling condenser 23 is in operation, the operating frequency of the second fan 231 of the evaporative cooling condenser 23 can be adjusted based on the high-pressure pressure of the evaporative cooling condenser 23. After the evaporative cooling condenser 23 is controlled to be in operation, the high-pressure pressure P' is detected by the pressure sensor 105 of the intermediate flow path 3 at intervals of a fourth set time, and a target deviation from the target high-pressure pressure P' is calculated: When |P-P'| ≥ D, where D is the high-pressure pressure target deviation limit, 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 factor. After each frequency adjustment, the high-pressure pressure can be re-detected, and subsequent judgment and control can be performed. When |P-P'| < D, the second fan 231 can be controlled to maintain its current state, i.e., the frequency of the second fan 231 is controlled to remain unchanged, and the high-pressure pressure can be re-detected, and subsequent judgment and control can be performed. This cycle repeats until the frequency of the second fan 231 reaches the maximum frequency, and then the frequency is no longer increased; or, until the second fan 231 is turned off, and then the frequency is no longer reduced.

[0107] It should be noted that the third duration and the fourth duration of this embodiment can be set according to actual needs and are not limited thereto. In addition, the third duration and the fourth duration can be the same or different and are not limited thereto.

[0108] In this embodiment, in cooling mode, when the air-cooled condenser 13 is in operation, the frequency of the first fan 131 is adjusted by high pressure, thereby further improving the heat exchange effect of the air-cooled condenser 13. When the evaporative cooling condenser 23 is in operation, the frequency of the first fan 131 is adjusted by high pressure, thereby further improving the heat exchange effect of the evaporative cooling condenser 23. Based on this, this embodiment can further improve the cooling effect of the entire heat pump unit 10 and enhance the user experience.

[0109] In one exemplary embodiment, reference Figures 1 to 3 As shown, a heat pump unit 10, an air conditioner including the heat pump unit 10, and a control method for 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 disposed between the second refrigerant main port 7 and the refrigerant channel of the shell and tube heat exchanger 30, and the four-way valve 50 is disposed between the first refrigerant main port 6 and the compressor 40. This air conditioner can be used to implement the control method described in the above embodiment, thereby achieving better cooling and heating effects and enhancing the user experience.

[0110] Professionals should also be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0111] It should be noted that references in this specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," and the like indicate that the described embodiments may include a particular feature, structure, or characteristic, but not necessarily every embodiment includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0112] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or air-conditioning equipment that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or air-conditioning equipment. In the absence of further limitations, an element defined by the sentence "includes a..." does not exclude the presence of other identical elements in the process, method, article or air-conditioning equipment that includes the element.

[0113] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art based on the present application are within the protection scope of the present 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, a first end of the first heat exchange flow path is connected to the first refrigerant main port, a second end of the first heat exchange flow path is connected to the first end of the intermediate flow path, a first end of the second heat exchange flow path is connected to the second end of the intermediate flow path, and a second end of the second heat exchange flow path is connected to 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 cooling 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 connected to the first end of the first bypass flow path, and the first end of the intermediate flow path is connected to the second end of the first bypass flow path; Wherein, when the heat pump unit is in 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 greater than the dry-bulb temperature threshold, the series flow path and the first bypass flow path are both in a conducting state, and the evaporative cooling condenser and the air-cooled condenser are both in an operating state; The first bypass flow path includes a first bypass valve, the opening size of the first bypass valve is adjustable, the initial opening of the first bypass valve is a first set opening, and when the first bypass valve is in a conducting state, the opening of the first bypass valve is adjusted at intervals of a first set time based on a first current heat dissipation of the air-cooled condenser and a second current heat dissipation of the evaporative cooling condenser.

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 cooling condenser is communicated with the second end of the third flow path, the fourth refrigerant port of the evaporative cooling 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, and the fourth flow path includes a fourth control valve; Among them, when the heat pump unit is in 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 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 on state.

3. 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, a first end of the second bypass flow path is connected to the second end of the intermediate flow path, and a second end of the second bypass flow path is connected to the second refrigerant main port; Among them, when the heat pump unit is in 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, the first heat exchange flow path and the second bypass flow path are both in a conducting state, the second heat exchange flow path and the first bypass flow path are in a closed state, the air-cooled condenser is in a working state, and the evaporative cooling condenser is in a non-working state.

4. The heat pump unit according to claim 3, characterized in that: The second bypass flow path includes a second bypass valve, and the second bypass valve is used to control the opening state and the closing state of the second bypass flow path.

5. The heat pump unit according to claim 3, characterized in that: When the heat pump unit is in 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 connected state, the air-cooled condenser is in a working state, and the evaporative cooling condenser is in a non-working state.

6. The heat pump unit according to any one of claims 1 to 5, characterized in that: When the heat pump unit is in cooling mode and the outdoor wet-bulb temperature is lower 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, the air-cooled condenser is in a non-working state, and the evaporative cooling condenser is in a working state.

7. An air conditioner, characterized in that: The air conditioner includes the heat pump unit according to any one of claims 1 to 6.

8. A control method, characterized in that: The control method is applied to the heat pump unit according to any one of claims 1 to 6, and the control method includes: When the heat pump unit is in 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 greater than the dry-bulb temperature threshold, the series flow path and the first bypass flow path of the heat pump unit are controlled to be in a conducting state, and the air-cooled condenser and the evaporative cooling condenser are controlled to be in an operating state; Among them, when the first bypass valve of the first bypass flow path is in the conducting state, the opening of the first bypass valve is adjusted at intervals of a first set time based on the first current heat dissipation (Q1) of the air-cooled condenser and the second current heat dissipation (Q2) of the evaporative cooling condenser.

9. The control method according to claim 8, characterized in that: The control method includes: When the heat pump unit is in 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 greater than the dry-bulb temperature threshold, the first bypass valve is controlled to be opened with a first set opening as an initial opening.

10. The control method according to claim 8, characterized in that: The adjusting the opening of the first bypass valve based on the first current heat dissipation (Q1) of the air-cooled condenser and the second current heat dissipation (Q2) of the evaporative cooling condenser includes: If Q2 / (Q1+Q2) is greater than or equal to the lower limit of the heat dissipation ratio and less than or equal to the upper limit of the heat dissipation ratio, the opening of the first bypass valve is controlled to maintain the current state.

11. The control method according to claim 8, characterized in that: The adjusting the opening of the first bypass valve based on the first current heat dissipation (Q1) of the air-cooled condenser and the second current heat dissipation (Q2) of the evaporative cooling condenser includes: If Q2 / (Q1+Q2) is less than the lower limit of the heat dissipation ratio, the opening of the first bypass valve is increased by a second set opening until the opening of the first bypass valve reaches the maximum opening.

12. The control method according to claim 8, characterized in that: The adjusting the opening of the first bypass valve based on the first current heat dissipation (Q1) of the air-cooled condenser and the second current heat dissipation (Q2) of the evaporative cooling condenser includes: If Q2 / (Q1+Q2) is greater than the upper limit of the heat dissipation ratio, the opening of the first bypass valve is adjusted down to a third set opening until the first bypass valve is closed.

13. The control method according to claim 8, characterized in that: The control method includes: When the heat pump unit is in cooling mode and the outdoor wet-bulb temperature is lower than the wet-bulb temperature threshold, the first heat exchange flow path of the heat pump unit is controlled to be in a closed state, the first bypass flow path and the second heat exchange flow path are controlled to be in a conducting state, the evaporative cooling condenser is controlled to be in a working state, and the air-cooled condenser is controlled to be in a non-working state.

14. The control method according to claim 13, characterized in that: The first bypass flow path includes a first bypass valve, and the control method includes: When the heat pump unit is in cooling mode and the outdoor wet-bulb temperature is less than the wet-bulb temperature threshold, the opening of the first bypass valve is controlled to be the maximum opening.

15. The control method according to claim 8, 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 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, the first heat exchange flow path and the second bypass flow path are controlled to be in a conducting state, and the second heat exchange flow path and the first bypass flow path are controlled to be in a closed state, and the air-cooled condenser is controlled to be in a working state, and the evaporative cooling condenser is controlled to be in a non-working state.

16. The control method according to claim 15, characterized in that: The second bypass flow path includes a second bypass valve, and the control method includes: When the heat pump unit is in 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, the opening of the second bypass valve is controlled to be maximum.

17. The control method according to claim 15, characterized in that: The control method includes: When the heat pump unit is in heating mode, the first heat exchange flow path and the second bypass flow path are controlled to be in a conducting state, and the first bypass flow path and the second heat exchange flow path are controlled to be in a closed state, and the evaporative cooling condenser is controlled to be in a non-working state, and the air-cooled condenser is controlled to be in a working state.

18. The control method according to claim 17, characterized in that: The control method includes: When the heat pump unit is in heating mode, the operating frequency of the first fan of the air-cooled condenser is adjusted based on the outlet liquid temperature of the shell and tube heat exchanger of the air conditioner and a set temperature threshold.

19. The control method according to any one of claims 8 to 18, characterized in that: The control method includes: When the heat pump unit is in cooling mode and the evaporative cooling condenser is in working state, the operating frequency of the second fan of the evaporative cooling condenser is adjusted based on the high pressure of the evaporative cooling condenser.

20. The control method according to any one of claims 8 to 18, characterized in that: The control method includes: When the heat pump unit is in cooling mode and the air-cooled condenser is in operation, the operating frequency of the first fan of the air-cooled condenser is adjusted based on the high pressure of the air-cooled condenser.

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