Air conditioner heat pump unit

Abstract

The air conditioner heat pump unit comprises a heat exchange loop, a water using pipeline, an electric appliance box and a heat exchange device, the heat exchange loop comprises a compressor, a four-way reversing valve, an inner heat exchanger and an outer heat exchanger which are sequentially connected, the inner heat exchanger is a heat exchange device for refrigerant and water, the water using pipeline comprises a water inlet pipe and a water outlet pipe, and the water inlet pipe is connected with a water inlet of the inner heat exchanger; the heat exchange device is arranged close to the electric appliance box and used for conducting heat exchange on the electric appliance box so as to adjust the temperature of the electric appliance box, the heat exchange device comprises a refrigerant path and a water path, the refrigerant path is connected with the heat exchange loop and used for circulating a refrigerant so as to conduct heat exchange on the electric appliance box, and the water path is connected between the water inlet pipe and the water outlet pipe; and the water is circulated for heat exchange of the electric appliance box. According to the operation condition of the unit, a refrigerant circulation mode or a water circulation mode is selected to conduct heat exchange on air near the electric appliance box, so that the effect of preventing condensation and overheating of the electric appliance box is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an air-conditioning heat pump unit. Background Art

[0002] During the operation of an air-conditioning heat pump unit, cold water and hot water can be produced. When the unit operates in a low-temperature and high-humidity environment or a high-temperature and high-humidity environment, condensation is likely to occur inside the electrical box. If too much condensed water accumulates, it may flow to electrical components and the substrate, resulting in short-circuit failure of the electronic control module or even causing fires. Once the electronic control components fail, the unit cannot operate, the comfort level decreases, and the user experience is affected.

[0003] Currently, to solve this problem, the temperature exchange between the inside and outside of the electrical box is often isolated by pasting a thermal insulation layer to solve the condensation problem of the electrical box 9. In addition, when the air-conditioning heat pump unit is operating in the refrigeration mode, the electrical load is relatively high during high-temperature operation and the heat generation is serious. Most manufacturers use the refrigerant heat dissipation method to cool the electrical box, which is contrary to the method of pasting a thermal insulation layer to prevent condensation.

[0004] The above information disclosed in this background art is only used to increase the understanding of the background art of this application. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

[0005] To address the problems pointed out in the background art, the present invention proposes an air-conditioning heat pump unit that selects to use the refrigerant cycle or the water cycle to exchange heat with the air near the electrical box according to the operating conditions of the unit, so as to achieve the effects of adjusting the temperature of the electrical box, preventing condensation and overheating of the electrical box.

[0006] To achieve the above invention purpose, the present invention is implemented by the following technical solutions: In some embodiments of the present application, an air-conditioning heat pump unit is provided, including: A heat exchange circuit, which includes a compressor, a four-way reversing valve, an internal heat exchanger, and an external heat exchanger connected in sequence. The internal heat exchanger is a heat exchange device for refrigerant and water; A water pipeline, which includes a water inlet pipe and a water outlet pipe. The water inlet pipe is connected to the water inlet of the internal heat exchanger, and the water outlet pipe is connected to the water outlet of the internal heat exchanger; An electrical box; A heat exchange device, which is arranged near the electrical box and is used to exchange heat with the electrical box to adjust the temperature of the electrical box. The heat exchange device includes: A refrigerant path, which is connected to the heat exchange circuit and is used to circulate refrigerant to exchange heat with the electrical box; A water path, which is connected between the water inlet pipe and the water outlet pipe and is used to circulate water to exchange heat with the electrical box.

[0007] The air-conditioning heat pump unit is provided with a heat exchange device which is arranged close to the electrical box and used for heat exchange of the electrical box. Specifically, it exchanges heat with the air near the electrical box, cools or heats the air near the electrical box, so as to adjust the temperature of the electrical box, increase or decrease the temperature of the electrical box, avoid condensation or overheating of the electrical box, improve the safety of the electrical box, and improve the operation reliability of the air-conditioning heat pump unit.

[0008] The heat exchange device uses refrigerant or water to exchange heat and adjust the temperature of the electrical box. The refrigerant used by the heat exchange device comes from the heat exchange circuit, and the water used by the heat exchange device comes from the water pipeline.

[0009] In different operating modes of the air-conditioning heat pump unit and at different ambient temperatures, there is a possibility of condensation or overheating of the electrical box. The system needs to select whether to use refrigerant or water circuit to cool or heat the electrical box according to different operating parameters, so as to achieve the purpose of effective anti-condensation and anti-overheating.

[0010] The air-conditioning heat pump unit adjusts the temperature of the electrical box through the heat exchange device, without the need to paste a heat insulation layer on the electrical box. It reasonably applies the current operating conditions of the unit, uses the refrigerant or water with the existing temperature in the unit to heat or cool the electrical box, and saves energy consumption.

[0011] In some embodiments, the heat exchange device selectively selects the refrigerant circuit or the water circuit to exchange heat with the electrical box as needed.

[0012] In some embodiments, when the unit is heating, the ambient temperature Ta is within the set range A, and the temperature Tfin of the electrical box < the preset value T1, the electrical box has a risk of condensation; When the outlet water temperature Tw of the internal heat exchanger ≥ the preset value T12, T12 ≥ T1, a part of the water in the outlet pipe flows into the water circuit to heat the electrical box; When the outlet water temperature Tw of the internal heat exchanger < the preset value T13, T13 ≤ T1 ≤ T12, a part of the high-temperature refrigerant discharged by the compressor flows into the refrigerant circuit to heat the electrical box.

[0013] In some embodiments, when the unit is heating and the temperature Tfin of the electrical box ≥ the preset value T2, the electrical box has a risk of overheating; When the outlet water temperature Tw of the internal heat exchanger ≤ the temperature Te of the refrigerant before entering the external heat exchanger, a part of the water in the outlet pipe flows into the water circuit to cool the electrical box; When the water outlet temperature Tw of the internal heat exchanger is greater than the temperature Te of the refrigerant before entering the external heat exchanger, a part of the refrigerant flowing out of the internal heat exchanger flows into the refrigerant path to cool the electrical box.

[0014] In some embodiments, when the unit is refrigerating, the ambient temperature Ta is within the set range B, and the temperature Tfin of the electrical box is less than the preset value T3, the electrical box has a risk of condensation. A part of the high-temperature refrigerant discharged by the compressor flows into the refrigerant path to heat up the electrical box.

[0015] In some embodiments, when the unit is refrigerating and the temperature Tfin of the electrical box is greater than or equal to the preset value T4, the electrical box has a risk of overheating. When the water outlet temperature Tw of the internal heat exchanger is less than or equal to the temperature Te of the refrigerant before entering the external heat exchanger, a part of the water in the water outlet pipe flows into the water path to cool the electrical box. When the water outlet temperature Tw of the internal heat exchanger is greater than the temperature Te of the refrigerant before entering the external heat exchanger, a part of the refrigerant flowing out of the external heat exchanger flows into the refrigerant path to cool the electrical box.

[0016] In some embodiments, the refrigerant inlet of the refrigerant path is connected to the first refrigerant branch and the second refrigerant branch. The first refrigerant branch is connected to the refrigerant pipeline between the external heat exchanger and the internal heat exchanger, and the second refrigerant branch is connected to the refrigerant pipeline between the exhaust pipe of the compressor and the four-way reversing valve. The refrigerant outlet of the refrigerant path is connected to the third refrigerant branch, and the third refrigerant branch is connected between the suction pipe of the compressor and the four-way reversing valve. A first refrigerant on-off valve is provided on the first refrigerant branch, a second refrigerant on-off valve is provided on the second refrigerant branch, and a third refrigerant on-off valve is provided on the third refrigerant branch. The second refrigerant branch and the third refrigerant branch form a refrigerant circuit to introduce the high-temperature refrigerant discharged from the compressor into the refrigerant path to heat up the electrical box. The first refrigerant branch and the third refrigerant branch form a refrigerant circuit to introduce the low-temperature refrigerant flowing out of the internal heat exchanger or the external heat exchanger into the refrigerant path to cool the electrical box.

[0017] In some embodiments, the water inlet of the water path is connected to the first water branch. The first water branch is connected to the water outlet pipe, and a first water on-off valve is provided on the first water branch. The water outlet of the water path is connected to the second water branch. The second water branch is connected to the water inlet pipe, and a second water on-off valve is provided on the second water branch. The first water branch and the second water branch form a water circuit to introduce the water in the water outlet pipe into the water path, so as to heat up or cool down the electric appliance box.

[0018] In some embodiments, a power device is provided on the second water branch. The power device is arranged between the second water on-off device and the water inlet pipe and is used for draining the water in the water path.

[0019] In some embodiments of the present application, an air-conditioning heat pump unit is provided, including: A heat exchange circuit, which includes a compressor, a four-way reversing valve, an internal heat exchanger, and an external heat exchanger connected in sequence. The internal heat exchanger is a heat exchange device for refrigerant and water; A water pipeline, which includes a water inlet pipe and a water outlet pipe. The water inlet pipe is connected to the water inlet of the internal heat exchanger, and the water outlet pipe is connected to the water outlet of the internal heat exchanger; An electric appliance box; A heat exchange device, which is arranged close to the electric appliance box. The heat exchange device uses refrigerant or water to exchange heat and adjust the temperature of the electric appliance box. The refrigerant used by the heat exchange device comes from the heat exchange circuit, and the water used by the heat exchange device comes from the water pipeline.

[0020] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become clearer. Description of the Drawings

[0021] 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 accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative labor.

[0022] Figure 1 It is a schematic diagram of the principle of an air-conditioning heat pump unit according to an embodiment; Figure 2 It is a schematic diagram of the structure of a heat exchange device according to an embodiment; Figure 3 It is a schematic diagram of the heating principle of an air-conditioning heat pump unit according to an embodiment; Figure 4 It is one of the schematic diagrams of the anti-condensation principle of an air-conditioning heat pump unit in the heating mode according to an embodiment; Figure 5 It is the second schematic diagram of the anti-condensation principle of an air-conditioning heat pump unit in the heating mode according to an embodiment; Figure 6 It is one of the schematic diagrams of the anti-overheating principle of an air-conditioning heat pump unit in the heating mode according to an embodiment; Figure 7 Schematic diagram II of the anti-overheating principle in the heating mode of an air-conditioning heat pump unit according to an embodiment; Figure 8 Schematic diagram of the refrigeration principle of an air-conditioning heat pump unit according to an embodiment; Figure 9 Schematic diagram of the anti-condensation principle in the refrigeration mode of an air-conditioning heat pump unit according to an embodiment; Figure 10 Schematic diagram I of the anti-overheating principle in the refrigeration mode of an air-conditioning heat pump unit according to an embodiment; Figure 11 Schematic diagram II of the anti-overheating principle in the refrigeration mode of an air-conditioning heat pump unit according to an embodiment; Figure 12 Schematic diagram of the heating control logic of an air-conditioning heat pump unit according to an embodiment; Figure 13 Schematic diagram of the refrigeration control logic of an air-conditioning heat pump unit according to an embodiment; Reference numerals: 1. Compressor; 2. Four-way reversing valve; 3. Outdoor heat exchanger; 4. Indoor heat exchanger; 5. User side; 6. Heat exchange device; 9. Electrical box; 10. Power device; 61. Refrigerant circuit; 611. Refrigerant inlet; 612. Refrigerant outlet; 62. Water circuit; 621. Water inlet of the water circuit; 622. Water outlet of the water circuit; 71. First refrigerant on-off valve; 72. Second refrigerant on-off valve; 73. Third refrigerant on-off valve; 74. First water on-off valve; 75. Second water on-off valve; 81. Ambient temperature sensor; 82. Refrigerant temperature sensor; 83. Outlet water temperature sensor; 84. Electrical temperature sensor; 85. Suction pressure sensor; 011. First refrigerant branch; 012. Second refrigerant branch; 013. Third refrigerant branch; 021. First water branch; 022. Second water branch; 031. Water inlet pipe; 032. Water outlet pipe. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0024] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0025] The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0026] In the description of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication between two elements inside. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0028] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, 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 reference 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. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0029] This embodiment discloses an air-conditioning heat pump unit, which, referring to Figure 1 , includes a heat exchange circuit, a water supply pipeline, an electrical box 9, a heat exchange device 6, etc.

[0030] The heat exchange circuit is a refrigerant heat exchange circuit, including a compressor 1, a four-way reversing valve 2, an internal heat exchanger 4, and an external heat exchanger 3 connected in sequence through refrigerant pipelines. The internal heat exchanger 4 is a heat exchange device 6 for refrigerant and water, and is used to produce circulating water for the user side 5.

[0031] The water supply pipeline includes a water inlet pipe 031 and a water outlet pipe 032. The water inlet pipe 031 is connected to the water inlet of the internal heat exchanger 4, and the water outlet pipe 032 is connected to the water outlet of the internal heat exchanger 4. Water flows into the internal heat exchanger 4 through the water inlet pipe 031, exchanges heat with the refrigerant in the internal heat exchanger 4, and the heated water flows out from the water outlet pipe 032 to provide the user with service water at the required temperature.

[0032] The refrigeration cycle of the heat exchange circuit includes a series of processes, involving compression, condensation, expansion, and evaporation, for cooling or heating the indoor space.

[0033] The low-temperature and low-pressure refrigerant enters the compressor 1, and the compressor 1 compresses it into a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0034] The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant formed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor 1. The evaporator can achieve the refrigeration effect by using the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled.

[0035] The internal heat exchanger and the external heat exchanger are used as condensers or evaporators. When the internal heat exchanger is used as a condenser, the air-conditioning heat pump unit is used as a heater in the heating mode, and when the internal heat exchanger is used as an evaporator, the air-conditioning heat pump unit is used as a cooler in the refrigeration mode.

[0036] The electrical box 9 is used to control the operation of the air-conditioning heat pump unit, and heat will be generated during its operation. When the air-conditioning heat pump unit operates in a low-temperature and high-humidity environment and a high-temperature and high-humidity environment, it is easy to cause condensation inside the electrical box 9. If too much condensed water accumulates, it may flow to the electrical components and the substrate, resulting in short-circuit failure of the electronic control module or even causing fires, etc. Once the electronic control components fail, the unit cannot operate, the comfort level decreases, and the user experience is affected.

[0037] To solve this problem, in this embodiment, a heat exchange device 6 is provided. It is arranged close to the electrical box 9 and used to exchange heat for the electrical box 9. Specifically, it exchanges heat for the air near the electrical box 9, cools or heats the air near the electrical box 9, so as to achieve the purpose of adjusting the temperature of the electrical box 9, increase or decrease the temperature of the electrical box 9, avoid condensation or overheating of the electrical box 9, improve the safety of the electrical box 9, and improve the operation reliability of the air-conditioning heat pump unit.

[0038] The heat exchange device 6 uses refrigerant or water to exchange heat and adjust the temperature of the electrical box 9. The refrigerant used by the heat exchange device 6 comes from the heat exchange circuit, and the water used by the heat exchange device 6 comes from the water pipeline.

[0039] In different operating modes of the air-conditioning heat pump unit and at different ambient temperatures, there is a possibility of condensation or overheating in the electrical box 9. The system needs to select whether to use refrigerant or water to cool or heat the electrical box 9 according to different operating parameters.

[0040] That is to say, the heat exchange device 6 selectively selects the refrigerant path 61 or the water path 62 as needed to exchange heat for the electrical box 9, heats or cools the electrical box 9, so as to achieve the purpose of effectively preventing condensation and overheating.

[0041] The air-conditioning heat pump unit adjusts the temperature of the electrical box 9 through the heat exchange device 6, and does not need to paste a heat insulation layer on the electrical box 9. It reasonably applies the current operating conditions of the unit, uses the refrigerant or water with the existing temperature in the unit to heat or cool the electrical box 9, and saves energy.

[0042] In some embodiments, the structure of the heat exchange device 6 refers to Figure 2 , which includes a refrigerant path 61 and a water path 62. Combining Figure 1 , the refrigerant path 61 is connected to the heat exchange circuit and used to circulate refrigerant to exchange heat for the electrical box 9; the water path 62 is connected between the water inlet pipe 031 and the water outlet pipe 032 and used to circulate water to exchange heat for the electrical box 9.

[0043] When the system determines that it is necessary to use high-temperature refrigerant to heat the electrical box 9 or low-temperature refrigerant to cool the electrical box 9, the refrigerant path 61 is turned on and the water path 62 is closed.

[0044] The refrigerant path 61 is connected to multiple different positions of the heat exchange circuit through multiple refrigerant branches, and a refrigerant switch is provided on each refrigerant branch. The refrigerant switch is used to control the conduction or closing of the corresponding refrigerant branch.

[0045] According to the operating conditions of the heat pump unit and the status of the electrical box 9 (dew condensation risk or overheating risk), if the system determines that it is necessary to use refrigerant to exchange heat with the electrical box 9, the system selects to conduct the corresponding refrigerant branch and closes the remaining refrigerant branches, so as to draw out the refrigerant at the required temperature (high-temperature refrigerant or low-temperature refrigerant) from the refrigerant pipeline of the heat exchange circuit, and use the high-temperature refrigerant to raise the temperature of the electrical box 9, or use the low-temperature refrigerant to lower the temperature of the electrical box 9.

[0046] The water circuit 62 is connected to the water inlet pipe 031 and the water outlet pipe 032 through a water branch. A water switch is arranged on the water branch, and the water switch is used to control the conduction or closing of the water branch.

[0047] According to the operating conditions of the heat pump unit and the status of the electrical box 9 (dew condensation risk or overheating risk), if the system determines that it is necessary to use the water circuit 62 to exchange heat with the electrical box 9, the system selects to conduct the water branch, so as to draw out the water in the water outlet pipe 032 to the heat exchange device 6, and use the high-temperature water to raise the temperature of the electrical box 9, or use the low-temperature water to lower the temperature of the electrical box 9.

[0048] In some embodiments, the system determines whether there is a risk of dew condensation or overheating in the electrical box 9, which is related to parameters such as the ambient temperature Ta, the temperature Tfin of the electrical box 9, the temperature Te of the refrigerant before entering the external heat exchanger 3, the outlet water temperature Tw of the internal heat exchanger 4, and the suction pressure Ps of the compressor 1.

[0049] The ambient temperature Ta is detected by the ambient temperature sensor 81. The ambient temperature sensor 81 is arranged around the air-conditioning heat pump unit and is used to detect the ambient temperature around the unit during operation.

[0050] The temperature Tfin of the electrical box 9 is detected by the electrical temperature sensor 84. The electrical temperature sensor 84 is arranged inside the electrical box 9 and is used to detect the temperature of the electrical box 9.

[0051] The temperature Te of the refrigerant before entering the external heat exchanger 3 is detected by the refrigerant temperature sensor 82. The refrigerant temperature sensor 82 is arranged on the refrigerant pipeline between the internal heat exchanger 4 and the external heat exchanger 3 and is used to detect the temperature of the refrigerant before entering the external heat exchanger 3.

[0052] The outlet water temperature Tw of the internal heat exchanger 4 is detected by the outlet water temperature sensor 83. The outlet water temperature sensor 83 is arranged on the water outlet pipe 032 and is used to detect the outlet water temperature of the internal heat exchanger 4.

[0053] The suction pressure Ps of the compressor 1 is detected by the suction pressure sensor, which is arranged on the suction pipe of the compressor 1 and is used to detect the suction pressure of the compressor 1.

[0054] Based on the detection data of the above-mentioned various sensors, the air-conditioning heat pump unit judges the state of the electrical box 9, determines whether there is a risk of condensation or overheating in the electrical box 9, and controls the on-off of the refrigerant switch and the water switch to select whether to draw out the refrigerant from the heat exchange circuit or draw out water from the water outlet pipe 032 to heat up or cool down the electrical box 9, so as to prevent the electrical box 9 from condensation or overheating.

[0055] In some embodiments, when the air-conditioning heat pump unit is heating, the ambient temperature Ta is within the set range A, and the temperature Tfin of the electrical box 9 < the preset value T1, the electrical box 9 has a risk of anti-condensation and needs to be heated up.

[0056] When the outlet water temperature Tw of the internal heat exchanger 4 ≥ the preset value T12, T12 ≥ T1, select to use high-temperature water to heat up the electrical box 9. At this time, a part of the water in the water outlet pipe 032 flows into the water path 62 in the heat exchange device 6 to heat up the electrical box 9 and prevent the electrical box 9 from condensation.

[0057] When the outlet water temperature Tw of the internal heat exchanger 4 < the preset value T13, T13 ≤ T1 ≤ T12, select to use high-temperature refrigerant to heat up the electrical box 9. A part of the high-temperature refrigerant discharged from the compressor 1 flows into the refrigerant path 61 in the heat exchange device 6 to heat up the electrical box 9 and prevent the electrical box 9 from condensation.

[0058] That is to say, under specific ambient temperature conditions, when the temperature Tfin of the electrical box 9 < the preset value T1, the electrical box 9 has a risk of condensation and needs to be heated up. At this time, the system judges whether the water temperature Tw in the water outlet pipe 032 is higher than the preset value T12. If the outlet water temperature Tw of the internal heat exchanger 4 ≥ the preset value T12, the system selects to use the water in the water outlet pipe 032 to exchange heat with the electrical box 9 to heat up the electrical box 9 and achieve the purpose of anti-condensation; if the outlet water temperature Tw of the internal heat exchanger 4 < the preset value T13, the system selects to use the high-temperature refrigerant in the heat exchange circuit to exchange heat with the electrical box 9 to heat up the electrical box 9 and achieve the purpose of anti-condensation.

[0059] In some embodiments, when the unit is heating and the temperature Tfin of the electrical box 9 ≥ the preset value T2, the electrical box 9 has a risk of overheating and needs to be cooled down.

[0060] When the outlet water temperature Tw of the internal heat exchanger 4 ≤ the temperature Te before the refrigerant enters the external heat exchanger 3, select to use low-temperature water to cool down the electrical box 9. At this time, a part of the water in the water outlet pipe 032 flows into the water path 62 of the heat exchange device 6 to cool down the electrical box 9 and prevent the electrical box 9 from overheating.

[0061] When the water outlet temperature Tw of the internal heat exchanger 4 is greater than the temperature Te of the refrigerant before it enters the external heat exchanger 3, a low-temperature refrigerant is selected to cool the electrical box 9. A part of the refrigerant flowing out of the internal heat exchanger 4 flows into the refrigerant path 61 of the heat exchange device 6 to cool the electrical box 9 and prevent the electrical box 9 from overheating.

[0062] That is to say, when the unit is in the heating mode and under all ambient temperature conditions, when the temperature Tfin of the electrical box 9 is greater than or equal to the preset value T2, the electrical box 9 has a risk of overheating and needs to be cooled. At this time, the system judges the magnitude relationship between the water temperature Tw in the outlet pipe 032 and the refrigerant temperature in the heat exchange circuit. If the water outlet temperature Tw of the internal heat exchanger 4 is less than or equal to the temperature Te of the refrigerant before it enters the external heat exchanger 3, the system selects the water in the outlet pipe 032 to exchange heat with the electrical box 9 to cool the electrical box 9 and achieve the purpose of preventing overheating; if the water outlet temperature Tw of the internal heat exchanger 4 is greater than the temperature Te of the refrigerant before it enters the external heat exchanger 3, the system selects the low-temperature refrigerant in the heat exchange circuit to exchange heat with the electrical box 9 to cool the electrical box 9 and achieve the purpose of preventing overheating.

[0063] In some embodiments, when the air-conditioning heat pump unit is in the cooling mode, the ambient temperature Ta is within the set range B, and the temperature Tfin of the electrical box 9 is less than the preset value T3, the electrical box 9 has a risk of condensation and needs to be heated.

[0064] Under this operating condition, a high-temperature refrigerant is used to heat the electrical box 9. A part of the high-temperature refrigerant discharged from the compressor 1 flows into the refrigerant path 61 of the heat exchange device 6 to heat the electrical box 9 and achieve the purpose of preventing condensation of the electrical box 9.

[0065] In some embodiments, when the unit is in the cooling mode and the temperature Tfin of the electrical box 9 is greater than or equal to the preset value T4, the electrical box 9 has a risk of overheating and needs to be cooled.

[0066] When the water outlet temperature Tw of the internal heat exchanger 4 is less than or equal to the temperature Te of the refrigerant before it enters the external heat exchanger 3, the system selects low-temperature water to cool the electrical box 9. At this time, a part of the water in the outlet pipe 032 flows into the water path 62 of the heat exchange device 6 to cool the electrical box 9 and achieve the purpose of preventing the electrical box 9 from overheating.

[0067] When the water outlet temperature Tw of the internal heat exchanger 4 is greater than the temperature Te of the refrigerant before it enters the external heat exchanger 3, the system selects low-temperature refrigerant to cool the electrical box 9. At this time, a part of the refrigerant flowing out of the external heat exchanger 3 flows into the refrigerant path 61 of the heat exchange device 6 to cool the electrical box 9 and achieve the purpose of preventing the electrical box 9 from overheating.

[0068] That is to say, when the unit is refrigerating, at all ambient temperature conditions, when the temperature Tfin of the electrical box 9 ≥ the preset value T4, there is a risk of overheating in the electrical box 9, and the electrical box 9 needs to be cooled. At this time, the system judges the magnitude relationship between the water temperature Tw in the outlet pipe 032 and the refrigerant temperature in the heat exchange circuit. If the outlet water temperature Tw of the internal heat exchanger 4 ≤ the temperature Te of the refrigerant before entering the external heat exchanger 3, the system selects to use the water in the outlet pipe 032 to exchange heat with the electrical box 9 to cool the electrical box 9 and achieve the purpose of preventing overheating; if the outlet water temperature Tw of the internal heat exchanger 4 > the temperature Te of the refrigerant before entering the external heat exchanger 3, the system selects to use the low-temperature refrigerant in the heat exchange circuit to exchange heat with the electrical box 9 to cool the electrical box 9 and achieve the purpose of preventing overheating.

[0069] In some embodiments, referring to Figure 1 and Figure 2 , the refrigerant inlet 611 of the refrigerant path 61 is connected to the first refrigerant branch 011 and the second refrigerant branch 012. The first refrigerant branch 011 is connected to the refrigerant pipeline between the external heat exchanger 3 and the internal heat exchanger 4, and the second refrigerant branch 012 is connected to the refrigerant pipeline between the exhaust pipe of the compressor 1 and the four-way reversing valve 2. The refrigerant outlet 612 of the refrigerant path 61 is connected to the third refrigerant branch 013, and the third refrigerant branch 013 is connected to the suction pipe of the compressor 1 and the four-way reversing valve 2.

[0070] A first refrigerant on-off valve 71 is provided on the first refrigerant branch 011, and the first refrigerant on-off valve 71 is used to control the conduction or closing of the first refrigerant branch 011. A second refrigerant on-off valve 72 is provided on the second refrigerant branch 012, and the second refrigerant on-off valve 72 is used to control the conduction or closing of the second refrigerant branch 012. A third refrigerant on-off valve 73 is provided on the third refrigerant branch 013, and the third refrigerant on-off valve 73 is used to control the conduction or closing of the third refrigerant branch 013.

[0071] The second refrigerant branch 012 and the third refrigerant branch 013 form a refrigerant circuit to introduce the high-temperature refrigerant discharged from the compressor 1 into the refrigerant path 61 to heat the electrical box 9.

[0072] The first refrigerant branch 011 and the third refrigerant branch 013 form a refrigerant circuit to introduce the low-temperature refrigerant flowing out of the internal heat exchanger 4 or the external heat exchanger 3 into the refrigerant path 61 to cool the electrical box 9.

[0073] Specifically, referring to Figure 5 or Figure 9 , Figure 5 when the unit is heating, Figure 9When the medium-capacity unit is refrigerating and the system determines that it is necessary to use high-temperature refrigerant to heat up the electrical box 9 to prevent condensation on the electrical box 9, the water circuit 62 of the heat exchange device 6 is closed, the first refrigerant switch 71 is closed, the second refrigerant switch 72 and the third refrigerant switch 73 are opened, the first refrigerant branch 011 is closed, the second refrigerant branch 012 and the third refrigerant branch 013 are conducted. A part of the high-temperature refrigerant discharged from the compressor 1 flows into the refrigerant path 61 of the heat exchange device 6 through the second refrigerant branch 012, and the electrical box 9 is heated up by using the high-temperature refrigerant. The refrigerant in the refrigerant path 61 then flows back to the compressor 1 through the third refrigerant branch 013.

[0074] Refer to Figure 7 When the unit is heating and the system determines that it is necessary to use low-temperature refrigerant to cool down the electrical box 9 to prevent the electrical box 9 from overheating, the water circuit 62 of the heat exchange device 6 is closed, the first refrigerant switch 71 and the third refrigerant switch 73 are opened, the second refrigerant switch 72 is closed, the first refrigerant branch 011 and the third refrigerant branch 013 are conducted, the second refrigerant branch 012 is closed. A part of the low-temperature refrigerant flowing out from the internal heat exchange flows into the refrigerant path 61 of the heat exchange device 6 through the first refrigerant branch 011, and the electrical box 9 is cooled down by using the low-temperature refrigerant. The refrigerant in the refrigerant path 61 then flows back to the compressor 1 through the third refrigerant branch 013.

[0075] Refer to Figure 11 When the unit is refrigerating and the system determines that it is necessary to use low-temperature refrigerant to cool down the electrical box 9 to prevent the electrical box 9 from overheating, the water circuit 62 of the heat exchange device 6 is closed, the first refrigerant switch 71 and the third refrigerant switch 73 are opened, the second refrigerant switch 72 is closed, the first refrigerant branch 011 and the third refrigerant branch 013 are conducted, the second refrigerant branch 012 is closed. A part of the low-temperature refrigerant flowing out from the external heat exchange flows into the refrigerant path 61 of the heat exchange device 6 through the first refrigerant branch 011, and the electrical box 9 is cooled down by using the low-temperature refrigerant. The refrigerant in the refrigerant path 61 then flows back to the compressor 1 through the third refrigerant branch 013.

[0076] In some embodiments, refer to Figure 1 and Figure 2 The water inlet of the water circuit 62 is connected to the first water branch 021. The first water branch 021 is connected to the outlet pipe 032. A first water switch 74 is provided on the first water branch 021. The first water switch 74 is used to control the conduction or closing of the first water branch 021.

[0077] The water outlet of the water circuit 62 is connected to the second water branch 022. The second water branch 022 is connected to the inlet pipe 031. A second water switch 75 is provided on the second water branch 022. The second water switch 75 is used to control the conduction or closing of the second water branch 022.

[0078] The first water branch 021 and the second water branch 022 form a water circuit to introduce the water in the water outlet pipe 032 into the water path 62, so as to heat up or cool down the electrical box 9.

[0079] Specifically, referring to Figure 4 , when the unit is in the heating mode and the system determines that high-temperature water needs to be used to heat up the electrical box 9 to prevent the electrical box 9 from condensing, the refrigerant path 61 of the heat exchange device 6 is closed, the first water switch 74 and the second water switch 75 are opened, the first water branch 021 and the second water branch 022 are conducted, and a part of the high-temperature water in the water outlet pipe 032 flows into the water path 62 of the heat exchange device 6 through the first water branch 021, and the electrical box 9 is heated up by using the high-temperature water, and the water in the water path 62 then flows into the water inlet pipe 031 through the second water branch 022.

[0080] Referring to Figure 7 , when the unit is in the heating mode and the system determines that low-temperature water needs to be used to cool down the electrical box 9 to prevent the electrical box 9 from overheating, the refrigerant path 61 of the heat exchange device 6 is closed, the first water switch 74 and the second water switch 75 are opened, the first water branch 021 and the second water branch 022 are conducted, and a part of the low-temperature water in the water outlet pipe 032 flows into the water path 62 of the heat exchange device 6 through the first water branch 021, and the electrical box 9 is cooled down by using the low-temperature water, and the water in the water path 62 then flows into the water inlet pipe 031 through the second water branch 022.

[0081] Referring to Figure 10 , when the unit is in the cooling mode and the system determines that low-temperature water needs to be used to cool down the electrical box 9 to prevent the electrical box 9 from overheating, the refrigerant path 61 of the heat exchange device 6 is closed, the first water switch 74 and the second water switch 75 are opened, the first water branch 021 and the second water branch 022 are conducted, and a part of the low-temperature water in the water outlet pipe 032 flows into the water path 62 of the heat exchange device 6 through the first water branch 021, and the electrical box 9 is cooled down by using the low-temperature water, and the water in the water path 62 then flows into the water inlet pipe 031 through the second water branch 022.

[0082] In some embodiments, a power device 10 is provided on the second water branch 022. The power device 10 is arranged between the second water switch 75 and the water inlet pipe 031 and is used to drain the water in the water path 62.

[0083] The following describes in detail the operation process of the air-conditioning heat pump unit under different working conditions in conjunction with the accompanying drawings. Among them, Figure 3 is a schematic diagram of the heating principle of the air-conditioning heat pump unit, Figure 4 is a schematic diagram of the water path heat exchange principle in the heating mode of the air-conditioning heat pump unit, Figure 5 is a schematic diagram of the high-temperature refrigerant heat exchange principle in the heating mode of the air-conditioning heat pump unit, Figure 6 is a schematic diagram of the water path heat dissipation principle in the heating mode of the air-conditioning heat pump unit, Figure 7Schematic diagram of the low-temperature refrigerant heat dissipation principle in the heating mode of the air-conditioning heat pump unit Figure 8 Schematic diagram of the refrigeration principle of the air-conditioning heat pump unit Figure 9 Schematic diagram of the high-temperature refrigerant heat exchange principle in the refrigeration mode of the air-conditioning heat pump unit Figure 10 Schematic diagram of the water-cooling heat dissipation principle in the refrigeration mode of the air-conditioning heat pump unit Figure 11 Schematic diagram of the low-temperature refrigerant heat dissipation principle in the refrigeration mode of the air-conditioning heat pump unit. In the figure, single arrows represent the refrigerant flow path, and double arrows represent the water flow path.

[0084] Refer to Figure 3 When the unit operates normally in heating mode, the internal heat exchanger 4 is used as a condenser, and the external heat exchanger 3 is used as an evaporator. The heat exchange device 6 is closed, that is, the first refrigerant on-off valve 71, the second refrigerant on-off valve 72, the third refrigerant on-off valve 73, the first water on-off valve 74, and the second water passage valve are normally closed. The refrigerant discharged from the compressor 1 flows through the four-way reversing valve 2, the internal heat exchanger 4, the external heat exchanger 3, the four-way reversing valve 2 in sequence, and then returns to the compressor 1. The water in the water inlet pipe 031 of the user side 5 flows into the internal heat exchanger 4, exchanges heat with the refrigerant, and then flows out from the water outlet pipe 032 to provide water at the required temperature for the user.

[0085] Refer to Figure 12 When the unit operates in heating mode and enters the first detection item, it is judged that {a1 ≤ Ta (ambient temperature) ≤ a2 and Tfin (temperature of the electrical box 9) ≤ b1 and [△Te ≤ b2 or △Ps ≤ c1]}. If so, it is judged that there is a risk of condensation in the electrical box 9, and heating anti-condensation control is entered; otherwise, the fifth detection item is entered, where △Te is the temperature change of the refrigerant before entering the external heat exchanger 3 within time t8, △Te = Te1 - Te2, Te1 is the refrigerant temperature at the current time, Te2 is the refrigerant temperature t8 time ago, △Ps is the change in the suction pressure of the compressor 1 within time t9, △Ps = Ps1 - Ps2, Ps1 is the suction pressure at the current time, and Ps2 is the suction pressure t9 time ago); For heating anti-condensation control, first enter the second detection item and judge [Tw (outlet water temperature of the internal heat exchanger 4) ≥ d1]. If so, water path heat exchange is performed; otherwise, high-temperature refrigerant heat exchange is performed.

[0086] The control logic of water path heat exchange is to use high-temperature water to heat up the electrical box 9. Refer to Figure 4 When the power device 10, the first water on-off valve 74, and the second water on-off valve 75 are opened, a part of the high-temperature hot water produced by the internal heat exchanger 4 is diverted through the first water branch 021 into the water path 62 of the heat exchange device 6 to heat up the electrical box 9 and achieve the function of preventing condensation in the water path. At this time, the first refrigerant on-off valve 71, the second refrigerant on-off valve 72, and the third refrigerant on-off valve 73 are all in the closed state, and the third detection item is entered; The third test item is to judge [Tfin (the temperature of the electrical box 9) ≥ b3 and the duration is t1]. If so, it is judged that there is no condensation risk in the electrical box 9 at this time, and the water circuit drainage control is entered. Otherwise, the water circuit heat exchange continues; The water circuit drainage control is to first close the first water on-off valve 74, and then close the second water on-off valve 75 and the power device 10 after a time t to achieve water circuit drainage. At this time, the heating anti-condensation control ends.

[0087] The control logic of the high-temperature refrigerant heat exchange is to use the high-temperature refrigerant to raise the temperature of the electrical box 9. Refer to Figure 5 , the second refrigerant on-off valve 72 and the third refrigerant on-off valve 73 are opened, so that a part of the high-temperature refrigerant discharged from the compressor 1 is diverted through the second refrigerant branch 012 into the refrigerant path 61 of the heat exchange device 6 to raise the temperature of the electrical box 9 and achieve the anti-condensation function of the refrigerant path. At this time, the first refrigerant on-off valve 71, the first water on-off valve 74, and the second water on-off valve 75 are all in the closed state, and the fourth test item is entered; The fourth test item is the same as the third test item, to judge [Tfin (the temperature of the electrical box 9) ≥ b3 and the duration is t1]. If so, it is judged that there is no condensation risk in the electrical box 9 at this time, and the high-temperature refrigerant heat exchange end control is entered. Otherwise, the high-temperature refrigerant heat exchange continues; The high-temperature refrigerant end control is to close the second refrigerant on-off valve 72 and the third refrigerant on-off valve 73. At this time, the heating anti-condensation control ends.

[0088] The fifth test item is to judge [Tfin (the temperature of the electrical box 9) ≥ b4 and the duration is t2]. If so, it is judged that there is an overheating risk in the electrical box 9 at this time, and the heating heat dissipation control is entered. Otherwise, the heating operation continues without performing other actions.

[0089] For the heating heat dissipation control, first enter the sixth test item to judge [Tw (the outlet water temperature of the internal heat exchanger 4) ≤ Te (the temperature of the refrigerant before entering the external heat exchanger 3)]. If so, the water circuit heat dissipation is entered. Otherwise, the low-temperature refrigerant heat dissipation is entered.

[0090] The control logic of the water circuit heat dissipation is to use the low-temperature water to cool down the electrical box 9. Refer to Figure 6 , the power device 10, the first water on-off valve 74, and the second water on-off valve 75 are opened, so that a part of the water produced by the internal heat exchanger 4 is diverted through the first water branch 021 into the water path 62 of the heat exchange device 6 to cool down the electrical box 9 and achieve the water circuit heat dissipation function. At this time, the first refrigerant on-off valve 71, the second refrigerant on-off valve 72, and the third refrigerant on-off valve 73 are all in the closed state, and the seventh test item is entered; The seventh detection item is to judge that [Tfin (the temperature of the electrical box 9) ≤ b5 and the duration is t3]. If so, it is judged that there is no overheating risk for the electrical box 9, and the water circuit evacuation control is entered. Otherwise, the water circuit heat dissipation continues; The water circuit evacuation control is to first close the first water on-off valve 74, and then close the second water on-off valve 75 and the power device 10 after a time t to achieve water circuit evacuation. At this time, the heating and heat dissipation control ends.

[0091] The control of low-temperature refrigerant heat dissipation is to use low-temperature refrigerant to cool the electrical box 9. Refer to Figure 7 , open the first refrigerant on-off valve 71 and the third refrigerant on-off valve 73, so that a part of the low-temperature refrigerant entering the external heat exchanger 3 is diverted through the second refrigerant branch 012 into the refrigerant path 61 of the heat exchange device 6 to dissipate heat and cool the electrical box 9, realizing the refrigerant heat dissipation function. At this time, the second refrigerant on-off valve 72, the first water on-off valve 74, and the second water on-off valve 75 are all in the closed state, and the eighth detection item is entered; The eighth detection item is the same as the seventh detection item, judging that [Tfin (the temperature of the electrical box 9) ≤ b5 and the duration is t3]. If so, it is judged that there is no overheating risk for the electrical box 9, and the refrigerant heat dissipation end control is entered; The refrigerant heat dissipation end control is to close the first refrigerant on-off valve 71 and the third refrigerant on-off valve 73. At this time, the heating and heat dissipation control ends.

[0092] Refer to Figure 8 , when the unit operates in normal refrigeration, the external heat exchanger 3 is used as a condenser, the internal heat exchanger 4 is used as an evaporator, and the heat exchange device 6 is closed, that is, the first refrigerant on-off valve 71, the second refrigerant on-off valve 72, the third refrigerant on-off valve 73, the first water on-off valve 74, and the second water on-off valve 75 are normally closed. The refrigerant discharged from the compressor 1 flows through the four-way reversing valve 2, the external heat exchanger 3, the internal heat exchanger 4, the four-way reversing valve 2 in sequence, and then returns to the compressor 1. The water flowing into the user side 5 through the water inlet pipe 031 flows into the internal heat exchanger 4, exchanges heat with the refrigerant, and then flows out from the water outlet pipe 032 to provide water at the required temperature for the user.

[0093] Refer to Figure 13 , when the unit operates in refrigeration, enter the ninth detection item, judge that [a3 ≤ Ta (ambient temperature) ≤ a4 and Tfin (the temperature of the electrical box 9) ≤ b6 and the duration is t4]. If so, it is judged that the electrical box 9 has a condensation risk, and the refrigeration anti-condensation control is entered. Otherwise, enter the eleventh detection item; The refrigeration anti-condensation control is a control method using high-temperature refrigerant for heat exchange. Refer to Figure 9, at this time, the second refrigerant switch 72 and the third refrigerant switch 73 are turned on, so that a part of the high-temperature refrigerant discharged by the compressor 1 is diverted through the second refrigerant branch 012 into the refrigerant path 61 of the heat exchange device 6 to raise the temperature of the electrical box 9, realizing the function of preventing condensation during refrigeration. At this time, the first refrigerant switch 71, the first water switch 74, and the second water switch 75 are all in the closed state, and the tenth detection item is entered; Tenth detection item, judge [Tfin (temperature of the electrical box 9) ≥ b7 and the duration t5]. If so, it is judged that there is no condensation risk in the electrical box 9 at this time, and the control of the end of the high-temperature refrigerant heat exchange is entered. Otherwise, the high-temperature refrigerant heat exchange continues; The control of the end of the high-temperature refrigerant is to turn off the second refrigerant switch 72 and the third refrigerant switch 73. At this time, the control of preventing condensation during refrigeration ends.

[0094] Eleventh detection item, judge [Tfin (temperature of the electrical box 9) ≥ b8 and the duration t6]. If so, it is judged that the electrical box 9 has an overheating risk, and the refrigeration heat dissipation control is entered. Otherwise, the refrigeration operation continues without performing other actions; Refrigeration heat dissipation control, first enter the twelfth detection item, judge [Tw (outlet water temperature of the internal heat exchanger 4) ≤ Te (temperature of the refrigerant before entering the external heat exchanger 3)]. If so, enter the water path heat dissipation. Otherwise, enter the low-temperature refrigerant heat dissipation; The control of the water path heat dissipation is to use low-temperature water to dissipate heat and cool down the electrical box 9. Refer to Figure 10 , the power device 10, the first water switch 74, and the second water switch 75 are turned on, so that a part of the water produced by the internal heat exchanger 4 is diverted through the first water branch 021 into the water path 62 of the heat exchange device 6 to dissipate heat and cool down the electrical box 9, realizing the function of water path heat dissipation. At this time, the first refrigerant switch 71, the second refrigerant switch 72, and the third refrigerant switch 73 are all in the closed state, and the thirteenth detection item is entered; Thirteenth detection item, judge [Tfin (temperature of the electrical box 9) ≤ b9 and the duration t7]. If so, it is judged that there is no overheating risk in the electrical box 9, and the water path emptying control is entered. Otherwise, the water path heat dissipation continues; The control of the water path emptying is to first turn off the first water switch 74, and then turn off the second water switch 75 and the power device 10 after a time t to realize the water path emptying. At this time, the refrigeration heat dissipation control ends; The control of the low-temperature refrigerant heat dissipation is to use the low-temperature refrigerant to cool down the electrical box 9. Refer to Figure 11, the first refrigerant switch 71 and the third refrigerant switch 73 are opened, so that a part of the low-temperature refrigerant flowing out of the external heat exchanger 3 is diverted through the first refrigerant branch 011 into the refrigerant path 61 of the heat exchange device 6 to dissipate heat from the electrical box 9 and achieve the refrigerant heat dissipation function. At this time, the second refrigerant switch 72, the first water switch 74, and the second water switch 75 are all in the closed state, and the fourteenth detection item is entered; The fourteenth detection item is the same as the thirteenth detection item. It is judged that [Tfin (the temperature of the electrical box 9) ≤ b9 and the duration is t7]. If so, it is judged that there is no overheating risk for the electrical box 9, and the refrigerant heat dissipation end control is entered; The refrigerant heat dissipation end control is to close the first refrigerant switch 71 and the third refrigerant switch 73. At this time, the refrigeration heat dissipation control ends.

[0095] In the description of the above embodiments, the specific features, structures, materials or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0096] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An air-conditioning heat pump unit, comprising: A heat exchange circuit, which includes a compressor, a four-way reversing valve, an internal heat exchanger, and an external heat exchanger connected in sequence. The internal heat exchanger is a heat exchange device for refrigerant and water; A water pipeline, which includes a water inlet pipe and a water outlet pipe. The water inlet pipe is connected to the water inlet of the internal heat exchanger, and the water outlet pipe is connected to the water outlet of the internal heat exchanger; An electrical box; Characterized in that the unit further includes: A heat exchange device, which is arranged close to the electrical box and is used for heat exchange of the electrical box to adjust the temperature of the electrical box. The heat exchange device includes: A refrigerant path, which is connected to the heat exchange circuit and is used for circulating refrigerant to heat exchange the electrical box; A water path, which is connected between the water inlet pipe and the water outlet pipe and is used for circulating water to heat exchange the electrical box.

2. The air-conditioning heat pump unit according to claim 1, characterized in that The heat exchange device selectively selects either the refrigerant path or the water path to heat exchange the electrical box as needed.

3. The air-conditioning heat pump unit according to claim 1, characterized in that When the unit is in heating mode, the ambient temperature Ta is within the set range A, and the temperature Tfin of the electrical box < the preset value T1, there is a risk of condensation on the electrical box; When the outlet water temperature Tw of the internal heat exchanger ≥ the preset value T12, T12 ≥ T1, a part of the water in the water outlet pipe flows into the water path to heat up the electrical box; When the outlet water temperature Tw of the internal heat exchanger < the preset value T13, T13 ≤ T1 ≤ T12, a part of the high-temperature refrigerant discharged from the compressor flows into the refrigerant path to heat up the electrical box.

4. The air-conditioning heat pump unit according to claim 1, characterized in that When the unit is in heating mode and the temperature Tfin of the electrical box ≥ the preset value T2, there is a risk of overheating of the electrical box; When the outlet water temperature Tw of the internal heat exchanger ≤ the temperature Te of the refrigerant before entering the external heat exchanger, a part of the water in the water outlet pipe flows into the water path to cool down the electrical box; When the outlet water temperature Tw of the internal heat exchanger > the temperature Te of the refrigerant before entering the external heat exchanger, a part of the refrigerant flowing out of the internal heat exchanger flows into the refrigerant path to cool down the electrical box.

5. The air-conditioning heat pump unit according to claim 1, characterized in that When the unit is in cooling mode, the ambient temperature Ta is within the set range B, and the temperature Tfin of the electrical box < the preset value T3, there is a risk of condensation on the electrical box; A part of the high-temperature refrigerant discharged from the compressor flows into the refrigerant path to heat up the electrical box.

6. The air-conditioning heat pump unit according to claim 1, characterized in that When the unit is in cooling mode and the temperature Tfin of the electrical box ≥ the preset value T4, there is a risk of overheating of the electrical box; When the outlet water temperature Tw of the internal heat exchanger ≤ the temperature Te of the refrigerant before entering the external heat exchanger, a part of the water in the water outlet pipe flows into the water path to cool down the electrical box; When the outlet water temperature Tw of the internal heat exchanger is greater than the temperature Te of the refrigerant before it enters the external heat exchanger, a part of the refrigerant flowing out of the external heat exchanger flows into the refrigerant path to cool the electrical box.

7. The air-conditioning heat pump unit according to any one of claims 1 to 6, characterized in that The refrigerant inlet of the refrigerant path is connected to a first refrigerant branch and a second refrigerant branch. The first refrigerant branch is connected to the refrigerant pipeline between the external heat exchanger and the internal heat exchanger, and the second refrigerant branch is connected to the refrigerant pipeline between the exhaust pipe of the compressor and the four-way reversing valve; The refrigerant outlet of the refrigerant path is connected to a third refrigerant branch, and the third refrigerant branch is connected between the suction pipe of the compressor and the four-way reversing valve; A first refrigerant on-off device is provided on the first refrigerant branch, a second refrigerant on-off device is provided on the second refrigerant branch, and a third refrigerant on-off device is provided on the third refrigerant branch; The second refrigerant branch and the third refrigerant branch form a refrigerant circuit to introduce the high-temperature refrigerant discharged from the compressor into the refrigerant path to heat the electrical box; The first refrigerant branch and the third refrigerant branch form a refrigerant circuit to introduce the low-temperature refrigerant flowing out of the internal heat exchanger or the external heat exchanger into the refrigerant path to cool the electrical box.

8. The air-conditioning heat pump unit according to any one of claims 1 to 6, characterized in that The water inlet of the water path is connected to a first water branch, and the first water branch is connected to the outlet pipe. A first water on-off device is provided on the first water branch; The water outlet of the water path is connected to a second water branch, and the second water branch is connected to the inlet pipe. A second water on-off device is provided on the second water branch; The first water branch and the second water branch form a water circuit to introduce the water in the outlet pipe into the water path to heat or cool the electrical box.

9. The air-conditioning heat pump unit according to claim 8, characterized in that A power device is provided on the second water branch, and the power device is arranged between the second water on-off device and the inlet pipe for draining the water in the water path.

10. An air-conditioning heat pump unit, comprising: A heat exchange circuit, which includes a compressor, a four-way reversing valve, an internal heat exchanger, and an external heat exchanger connected in sequence. The internal heat exchanger is a heat exchange device for refrigerant and water; A water pipeline, which includes an inlet pipe and an outlet pipe. The inlet pipe is connected to the water inlet of the internal heat exchanger, and the outlet pipe is connected to the water outlet of the internal heat exchanger; An electrical box; Characterized in that the unit further includes: A heat exchange device, which is arranged close to the electrical box. The heat exchange device uses refrigerant or water to exchange heat and adjust the temperature of the electrical box. The refrigerant used by the heat exchange device comes from the heat exchange circuit, and the water used by the heat exchange device comes from the water pipeline.

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