A liquid cooling device for frequency converter

Abstract

The utility model relates to the technical field of air conditioning, and specifically to a frequency converter liquid cooling heat dissipation device, comprising a first compressor, a first outdoor heat exchanger, a first indoor heat exchanger, a first liquid cooling pipe and a first throttle valve; one end of the first compressor is connected to one end of the first outdoor heat exchanger; the other end of the first outdoor heat exchanger is connected to one end of the first liquid cooling pipe; the other end of the first liquid cooling pipe is connected to one end of the first throttle valve; the other end of the first throttle valve is connected to one end of the first indoor heat exchanger; the other end of the first indoor heat exchanger is connected to the other end of the first compressor; and a first outdoor fan is provided at the first outdoor heat exchanger. The utility model places the liquid cooling pipe between the outdoor heat exchanger and the throttle valve, and controls the rotation speed of the outdoor fan to control the condensation pressure, thereby preventing the generation of condensation and saving costs.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to a frequency converter liquid cooling and heat dissipation device. Background Art

[0002] When used for high-power inverters, conventional air-cooled heat sinks are difficult to meet the temperature rise requirements when the unit is overloaded. The electronic control module may be damaged due to overheating, or overtemperature frequency reduction may be triggered, which cannot meet the performance of the unit and the load requirements of the room. In order to solve the problem of heat dissipation difficulty of the above-mentioned air-cooled heat sinks, liquid cooling is used for inverter heat dissipation, but liquid cooling will inevitably encounter a high risk of condensation.

[0003] Existing liquid cooling solutions to avoid condensation:

[0004] 1. Add air-cooled heat sinks and small fans outside the aluminum plate of the liquid cooling pipeline. When the temperature of the liquid cooling pipe is lower than the dew point temperature, turn on the fan to disturb the air around the inverter and the liquid cooling aluminum plate to reduce the surrounding air temperature. At the same time, cool the air-cooled heat sink to avoid condensation caused by overcooling. However, adding air-cooled heat sinks and fans on the basis of liquid cooling is equivalent to using two sets of electronic control solutions. Liquid cooling solves the problem that air cooling cannot effectively dissipate heat when the outdoor temperature is high, and air cooling solves the condensation problem of liquid cooling. The solution is complex and requires the addition of dew point detection devices, cooling fan control and other logic. The added devices and logic are not related to the operation of the whole machine and increase costs.

[0005] 2. Moderately heat the liquid-cooled aluminum plate shell. When the aluminum plate temperature is higher than the dew point temperature, condensation will not occur. However, heating the liquid-cooled aluminum plate to avoid condensation requires an additional heating device and dew point temperature detection-related devices and logic. The added devices and logic are irrelevant to the operation of the entire machine and increase costs.

[0006] 3. Place the liquid cooling pipeline between the condenser condensation branch and the subcooling flow path to reduce the risk of condensation caused by supercooling. Placing the liquid cooling pipeline between the condenser condensation branch and the subcooling flow path can only solve the condensation problem of the single cooling model and the inverter heat sink placed outdoors. It is not suitable for heat pump models and the problem of the compressor / inverter being indoors. When the compressor / inverter is indoors, the liquid cooling pipeline can only be placed after the subcooling flow path, and when the outdoor temperature is lower than the indoor temperature (especially the outdoor low temperature) and the indoor humidity is high, the temperature after supercooling must be lower than the dew point temperature, resulting in condensation problems. When used for heat pump models, the outdoor is the evaporator, and the liquid cooling pipeline is installed after the expansion valve. After the expansion valve throttling, cooling and reducing the pressure, the temperature in the liquid cooling pipe will be lower than the dew point temperature corresponding to the outdoor return air temperature and humidity, resulting in condensation problems. When heating at low temperatures, even the liquid cooling pipeline will freeze, which poses a high risk to the inverter. Utility Model Content

[0007] The purpose of the utility model is to provide a frequency converter liquid cooling device to effectively prevent condensation from occurring in view of the above-mentioned deficiencies in the prior art.

[0008] The purpose of the utility model is achieved through the following technical solutions: A frequency converter liquid cooling and heat dissipation device comprises a first compressor, a first outdoor heat exchanger, a first indoor heat exchanger, a first liquid cooling pipe and a first throttle valve;

[0009] One end of the first compressor is connected to one end of the first outdoor heat exchanger; the other end of the first outdoor heat exchanger is connected to one end of the first liquid cooling pipe; the other end of the first liquid cooling pipe is connected to one end of the first throttle valve; the other end of the first throttle valve is connected to one end of the first indoor heat exchanger; the other end of the first indoor heat exchanger is connected to the other end of the first compressor;

[0010] The first outdoor heat exchanger is provided with a first outdoor fan.

[0011] The utility model is further configured such that a first pressure sensor is provided between one end of the first compressor and one end of the first outdoor heat exchanger.

[0012] The utility model is further configured such that the first throttle valve is an expansion valve.

[0013] A frequency converter liquid cooling and heat dissipation device, comprising a second compressor, a second outdoor heat exchanger, a second indoor heat exchanger, a second liquid cooling pipe, a second throttle valve, a one-way throttle valve and a four-way valve;

[0014] One end of the second outdoor heat exchanger is connected to one end of the one-way throttle valve; the other end of the one-way throttle valve is connected to one end of the second liquid cooling pipe; the other end of the second liquid cooling pipe is connected to one end of the second throttle valve; the other end of the second throttle valve is connected to one end of the second indoor heat exchanger; the other end of the second indoor heat exchanger, one end of the compressor, the other end of the compressor and the other end of the second outdoor heat exchanger are respectively connected to the four-way valve;

[0015] The second outdoor heat exchanger is provided with a second outdoor fan.

[0016] The utility model is further configured such that a second pressure sensor is provided between one end of the second compressor and the four-way valve.

[0017] The utility model is further configured such that the second throttle valve is an expansion valve.

[0018] The utility model is further configured that the four-way valve includes a first interface, a second interface, a third interface and a fourth interface; the first interface is connected to one end of the second compressor; the second interface is connected to the other end of the second outdoor heat exchanger; the third interface is connected to the other end of the second compressor; the fourth interface is connected to the other end of the second indoor heat exchanger;

[0019] When the first interface is connected to the second interface, the third interface is connected to the fourth interface; when the first interface is connected to the fourth interface, the second interface is connected to the third interface.

[0020] The utility model is further configured such that an indoor fan is provided at the second indoor heat exchanger.

[0021] Beneficial effects of the utility model: the utility model places a liquid cooling pipe between an outdoor heat exchanger and a throttle valve, and controls the rotation speed of an outdoor fan to control the condensation pressure, thereby preventing the generation of condensation and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the utility model. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0023] Figure 1 It is a structural principle diagram of Embodiment 1 of the present utility model;

[0024] Figure 2 It is a structural principle diagram of Embodiment 2 of the present utility model;

[0025] Among them: 11, the first compressor; 12, the first outdoor heat exchanger; 13, the first indoor heat exchanger; 14, the first liquid cooling pipe; 15, the first throttle valve; 2, the first outdoor fan; 3, the first pressure sensor; 41, the second compressor; 42, the second outdoor heat exchanger; 43, the second indoor heat exchanger; 44, the second liquid cooling pipe; 45, the second throttle valve; 46, the one-way throttle valve; 5, the four-way valve; 51, the first interface; 52, the second interface; 53, the third interface; 54, the fourth interface; 6, the second outdoor fan; 7, the second pressure sensor; 8, the indoor fan. DETAILED DESCRIPTION

[0026] The utility model is further described in conjunction with the following embodiments.

[0027] Embodiment 1, by Figure 1 It can be seen that the inverter liquid cooling heat dissipation device described in this embodiment includes a first compressor 11, a first outdoor heat exchanger 12, a first indoor heat exchanger 13, a first liquid cooling pipe 14 and a first throttle valve 15;

[0028] One end of the first compressor 11 is connected to one end of the first outdoor heat exchanger 12; the other end of the first outdoor heat exchanger 12 is connected to one end of the first liquid cooling pipe 14; the other end of the first liquid cooling pipe 14 is connected to one end of the first throttle valve 15; the other end of the first throttle valve 15 is connected to one end of the first indoor heat exchanger 13; the other end of the first indoor heat exchanger 13 is connected to the other end of the first compressor 11;

[0029] The first outdoor heat exchanger 12 is provided with a first outdoor fan 2 .

[0030] Specifically, the present embodiment can be applied to a single cooling type through the above arrangement. By placing the first liquid cooling pipe 14 between the first outdoor heat exchanger 12 and the first throttle valve 15, the present embodiment can control the condensing pressure by controlling the rotation speed of the first outdoor fan 2 (the smaller the rotation speed of the first outdoor fan 2, the slower the heat dissipation, resulting in a higher condensing pressure). For example, when R410A refrigerant is used, when the outdoor temperature is -5°C, the condensing pressure is guaranteed to be higher than 1.6MPa under standard working conditions, and the condensing temperature can be achieved to be higher than 25°C. Even considering the condenser pressure drop, The connecting pipeline pressure drop and supercooling design can also ensure that the refrigerant temperature entering the first liquid cooling tube 14 will not be lower than 15°C, so that there will be no condensation under standard conditions; and under high humidity conditions, the condensing pressure is ensured to be higher than 1.8MPa, and the condensing temperature can be higher than 30°C. Taking into account the condenser pressure drop, the connecting pipeline pressure drop and the supercooling design, it can also be ensured that the refrigerant temperature entering the first liquid cooling tube 14 will not be lower than 20°C, so that there will be no condensation under high humidity conditions; the condensing pressure limit can be evaluated and determined based on the size of the condenser, the outdoor temperature application scenario, and the indoor temperature and humidity application scenario.

[0031] When the first compressor 11, the inverter and the first liquid cooling pipe 14 are placed outdoors, due to the countercurrent heat release of the first outdoor heat exchanger 12 (condenser), the temperature of the first liquid cooling pipe 14 will definitely not be lower than the outdoor return air temperature, and it is even less likely to be lower than the dew point temperature corresponding to the outdoor return air temperature and humidity. At this time, there will be no risk of condensation.

[0032] When the first compressor 11, the inverter and the first liquid cooling pipe 14 are placed indoors, as described above, the temperature of the refrigerant entering the first liquid pipe will not be lower than 20°C. At this time, the dew point temperature may be higher than 20°C only under extreme conditions of high temperature and high humidity indoors, and this situation will not occur suddenly during the normal operation of the air conditioner. Even if high temperature and high humidity conditions occur, in the dehumidification mode, the temperature and humidity will decrease, the dew point temperature will decrease, the dew point temperature will be higher than 20°C for a short time, and the risk of condensation is very low.

[0033] In the inverter liquid cooling device described in this embodiment, a first pressure sensor 3 is provided between one end of the first compressor 11 and one end of the first outdoor heat exchanger 12. Through the above arrangement, the rotation speed of the first outdoor fan 2 can be controlled to control the condensing pressure.

[0034] In the inverter liquid cooling device described in this embodiment, the first throttle valve 15 is an expansion valve. The above arrangement makes the whole system stable and reliable.

[0035] Embodiment 2, by Figure 2 It can be seen that the inverter liquid cooling heat dissipation device described in this embodiment includes a second compressor 41, a second outdoor heat exchanger 42, a second indoor heat exchanger 43, a second liquid cooling pipe 44, a second throttle valve 45, a one-way throttle valve 46 and a four-way valve 5;

[0036] One end of the second outdoor heat exchanger 42 is connected to one end of a one-way throttle valve 46; the other end of the one-way throttle valve 46 is connected to one end of a second liquid cooling pipe 44; the other end of the second liquid cooling pipe 44 is connected to one end of a second throttle valve 45; the other end of the second throttle valve 45 is connected to one end of a second indoor heat exchanger 43; the other end of the second indoor heat exchanger 43, one end of the compressor, the other end of the compressor and the other end of the second outdoor heat exchanger 42 are respectively connected to the four-way valve 5;

[0037] The second outdoor heat exchanger 42 is provided with a second outdoor fan 6 .

[0038] Specifically, this embodiment can be applied to heat pump models through the above-mentioned configuration;

[0039] When cooling, the system refrigerant flows in the direction of the second compressor 41-the second outdoor heat exchanger 42-the one-way throttle valve 46 (which is used as a one-way valve at this time, without throttling effect)-the second liquid cooling pipe 44-the second throttle valve 45-the second indoor heat exchanger 43-the second compressor 41. At this time, the condensation pressure is ensured by controlling the speed of the second outdoor fan 6. At this time, the heat dissipation and anti-condensation effects of the second liquid cooling pipe 44 are completely consistent with those of the single cooling model in Example 1.

[0040] When heating, throttling is mainly performed by the one-way throttle valve 46, and the second throttle valve 45 is used for auxiliary pressure reduction. The selection of the one-way throttle valve 46 should provide a greater throttling effect. The refrigerant flows in the second compressor 41-the second indoor heat exchanger 43-the second throttle valve 45-the second liquid cooling pipe 44-the one-way throttle valve 46 (at this time, it is used as a throttling valve and has a throttling effect)-the second outdoor heat exchanger 42-the second compressor 41.

[0041] The second indoor heat exchanger 43 plays a condensing role during heating, and the refrigerant comes out as a high-pressure supercooled liquid refrigerant. After a small pressure reduction through the second throttle valve 45, the refrigerant before the second liquid cooling pipe 44 after the second throttle valve 45 is still a supercooled liquid refrigerant, but the pressure will be reduced. Considering the heating scenario, the pipeline after condensation generally releases heat, and the temperature before the second liquid cooling pipe 44 after the second throttle valve 45 will be lower than the refrigerant outlet temperature of the second indoor heat exchanger 43, but will not be lower than the ambient temperature of the second liquid cooling pipe 44. Therefore, no matter whether the second compressor 41, the inverter, and the second liquid cooling pipe 44 are placed indoors or outdoors, the dew point temperature will not be higher than the temperature of the liquid cooling pipe, and condensation will not occur. After the refrigerant passes through the second liquid cooling pipe 44, it is reduced in pressure and temperature through the strong throttling effect of the one-way throttle valve 46 to enter the second outdoor heat exchanger 42 for evaporation and heat absorption. The second outdoor heat exchanger 42 plays an evaporation role during heating.

[0042] In the inverter liquid cooling device described in this embodiment, a second pressure sensor 7 is provided between one end of the second compressor 41 and the four-way valve 5. Through the above arrangement, the speed of the second outdoor fan 6 can be controlled to control the condensing pressure during cooling.

[0043] In the inverter liquid cooling device described in this embodiment, the second throttle valve 45 is an expansion valve. The above arrangement makes the whole system stable and reliable.

[0044] In the inverter liquid cooling device described in this embodiment, the four-way valve 5 includes a first interface 51, a second interface 52, a third interface 53 and a fourth interface 54; the first interface 51 is connected to one end of the second compressor 41; the second interface 52 is connected to the other end of the second outdoor heat exchanger 42; the third interface 53 is connected to the other end of the second compressor 41; the fourth interface 54 is connected to the other end of the second indoor heat exchanger 43;

[0045] When the first interface 51 is connected to the second interface 52 , the third interface 53 is connected to the fourth interface 54 ; when the first interface 51 is connected to the fourth interface 54 , the second interface 52 is connected to the third interface 53 .

[0046] Specifically, through the above-mentioned arrangement, when one end of the second compressor 41 is connected to the other end of the second outdoor heat exchanger 42, the other end of the second compressor 41 is connected to the other end of the second indoor heat exchanger 43; in addition, when one end of the second compressor 41 is connected to the other end of the second indoor heat exchanger 43, the other end of the second compressor 41 is connected to the other end of the second outdoor heat exchanger 42.

[0047] In the inverter liquid cooling device described in this embodiment, an indoor fan 8 is provided at the second indoor heat exchanger 43. Through the above arrangement, the speed of the indoor fan 8 can be controlled during heating to ensure the condensation pressure and condensation temperature during heating.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A liquid cooling device for a frequency converter, characterized in that: It comprises a first compressor (11), a first outdoor heat exchanger (12), a first indoor heat exchanger (13), a first liquid cooling pipe (14) and a first throttle valve (15); One end of the first compressor (11) is connected to one end of the first outdoor heat exchanger (12); the other end of the first outdoor heat exchanger (12) is connected to one end of the first liquid cooling pipe (14); the other end of the first liquid cooling pipe (14) is connected to one end of the first throttle valve (15); the other end of the first throttle valve (15) is connected to one end of the first indoor heat exchanger (13); the other end of the first indoor heat exchanger (13) is connected to the other end of the first compressor (11); The first outdoor heat exchanger (12) is provided with a first outdoor fan (2).

2. The inverter liquid cooling device according to claim 1, characterized in that: A first pressure sensor (3) is provided between one end of the first compressor (11) and one end of the first outdoor heat exchanger (12).

3. The inverter liquid cooling device according to claim 1, characterized in that: The first throttle valve (15) is an expansion valve.

4. A frequency converter liquid cooling device, characterized in that: It comprises a second compressor (41), a second outdoor heat exchanger (42), a second indoor heat exchanger (43), a second liquid cooling pipe (44), a second throttle valve (45), a one-way throttle valve (46) and a four-way valve (5); One end of the second outdoor heat exchanger (42) is connected to one end of a one-way throttle valve (46); the other end of the one-way throttle valve (46) is connected to one end of a second liquid cooling pipe (44); the other end of the second liquid cooling pipe (44) is connected to one end of a second throttle valve (45); the other end of the second throttle valve (45) is connected to one end of a second indoor heat exchanger (43); the other end of the second indoor heat exchanger (43), one end of the compressor, the other end of the compressor and the other end of the second outdoor heat exchanger (42) are respectively connected to a four-way valve (5); The second outdoor heat exchanger (42) is provided with a second outdoor fan (6).

5. The inverter liquid cooling device according to claim 4, characterized in that: A second pressure sensor (7) is provided between one end of the second compressor (41) and the four-way valve (5).

6. The inverter liquid cooling device according to claim 4, characterized in that: The second throttle valve (45) is an expansion valve.

7. The inverter liquid cooling device according to claim 4, characterized in that: The four-way valve (5) comprises a first interface (51), a second interface (52), a third interface (53) and a fourth interface (54); the first interface (51) is connected to one end of the second compressor (41); the second interface (52) is connected to the other end of the second outdoor heat exchanger (42); the third interface (53) is connected to the other end of the second compressor (41); and the fourth interface (54) is connected to the other end of the second indoor heat exchanger (43); When the first interface (51) is connected to the second interface (52), the third interface (53) is connected to the fourth interface (54); when the first interface (51) is connected to the fourth interface (54), the second interface (52) is connected to the third interface (53).

8. The inverter liquid cooling device according to claim 4, characterized in that: An indoor fan (8) is provided at the second indoor heat exchanger (43).

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