Efficient dual condenser air conditioning

Abstract

The present invention relates to the technical field of vehicle-mounted air conditioning equipment, and discloses an air conditioning device with high efficiency of double condensers, including: a driving refrigeration system composed of a condenser A, an evaporator A, an evaporator B, and a driving compressor A; a parking refrigeration system composed of a condenser B, an evaporator C, and a parking compressor B; a ventilation system composed of an axial flow fan, a centrifugal fan A, and a centrifugal fan B; an electric control system composed of a driving DC power supply, a parking AC power supply, a control unit, and a power converter, and the driving DC power supply supplies power to the driving compressor A, the axial flow fan, the centrifugal fan A, and the centrifugal fan B through the control unit. The present invention has a simple structure, is easy to manufacture, has low cost, high efficiency, is easy to install, has a low failure rate, high reliability, is easy to maintain, and can efficiently achieve air conditioning. In addition, it can effectively protect the refrigeration system, is safe and reliable, and saves energy.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle-mounted air conditioning equipment, and in particular to an air conditioning device with high efficiency double condensers. Background Art

[0002] Special mobile vehicles are equipped with special air conditioners, which have functions such as cooling and heating, and provide a good temperature and humidity environment for the equipment and personnel in the vehicle. Due to the mobile and all-weather characteristics of special vehicles, and the generators equipped with special vehicles are often powered by oil engines, the output power of oil engines is not very large, which limits the power consumption of special air conditioners; the power provided by the oil engine also limits the starting current of special air conditioners.

[0003] High-efficiency double-condenser air conditioning devices have become the preferred solution for temperature regulation of special large-heat enclosed spaces due to their high efficiency, low starting current, low power consumption, high reliability, low cost, energy saving and many other advantages. Based on the development needs of the special high-power electronic heating equipment industry, many special high-power electronic heating equipment currently need to be temperature regulated within the full operating range, especially when the ambient temperature is high and the temperature needs to be reduced, but at the same time the power consumption of the air conditioner is limited. Based on this power requirement, how to achieve temperature regulation within the full operating temperature range and other technologies have put forward new requirements for the air conditioning system. The air conditioning system uses steam compression to achieve refrigeration. For high-power refrigeration systems, some use single refrigeration system variable frequency control to achieve low current starting and power limitation, but to achieve refrigeration within the full operating range, this type of refrigeration requires many adjustment devices, such as setting up frequency converters, condensing pressure regulating valves, and using stepless speed regulation for fans for condensation cooling. The above methods are complex to adjust and have high manufacturing costs; some use dual systems to achieve time-sharing start-up, but the dual condensers and dual fans in the dual systems are independently controlled, and the condensation and heat dissipation of the two systems are unrelated. In this way, when a single refrigeration system is turned on, the evaporation fan is shared, and the air intake of the evaporation fan is the same as that of the dual refrigeration system, resulting in a mismatch between the evaporation effect and the condensation heat dissipation effect, and the condensation air volume is only half of the original. When the ambient temperature is high, the condensation load is large and the condensation effect is poor, which can easily cause the refrigeration system to work abnormally and the compressor protection cannot refrigerate normally. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose an air conditioning device with high efficiency double condensers.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A highly efficient double-condenser air conditioning device includes a refrigeration system A, a refrigeration system B, a ventilation system, and an electric control system. The refrigeration system A includes a compressor A, a condenser AⅠ, a condenser AⅡ, a liquid storage device A, a filter A, a thermal expansion valve A, an evaporator A, and a gas-liquid separator A;

[0007] The refrigeration system B includes a compressor B, a condenser BⅠ, a condenser BⅡ, a liquid storage device B, a filter B, a thermal expansion valve B, an evaporator B, and a gas-liquid separator B;

[0008] In the refrigeration system A, compressor A, condenser A, liquid reservoir A, filter A, thermal expansion valve A, evaporator A, and gas-liquid separator A constitute a refrigeration cycle loop; in the refrigeration system B, compressor B, condenser B, liquid reservoir B, filter B, thermal expansion valve B, evaporator B, and gas-liquid separator B constitute a refrigeration cycle loop; condenser AⅠ, condenser AⅡ, condenser BⅠ, condenser BⅡ, evaporator A, and evaporator B realize heat exchange between the refrigeration cycle loop of refrigeration system A and the refrigeration cycle loop of refrigeration system B;

[0009] The ventilation system includes an axial flow fan A for condenser AⅠ in refrigeration system A and condenser BⅠ in refrigeration system, an axial flow fan B for condenser AⅡ in refrigeration system B and condenser BⅡ in refrigeration system, and a centrifugal fan A for evaporator A and evaporator B to supply air to the room;

[0010] The electric control system includes a power supply and a control unit, wherein the power supply is connected to compressor A, compressor B, axial flow fan A, axial flow fan B and centrifugal fan through the control unit.

[0011] Preferably, the refrigeration system A includes a compressor A, a condenser AⅠ, a condenser AⅡ, a liquid reservoir A, a filter A, a thermal expansion valve A, an evaporator A, and a gas-liquid separator A, wherein the outlet end of the compressor A is connected to one end of the condenser AⅠ and the condenser AⅡ respectively through pipelines, the other ends of the condenser AⅠ and the condenser AⅡ are merged and communicated with the liquid reservoir A through a pipeline, the liquid reservoir A is also connected to one end of the filter through a pipeline, the other end of the filter is connected to the inlet of the expansion valve A through a pipeline, the outlet of the expansion valve A is connected to one end of the evaporator A through a pipeline, the other end of the evaporator A is connected to the inlet of the gas-liquid separator A through a pipeline, and the other end of the gas-liquid separator A is connected to the inlet end of the compressor A through a pipeline, thereby forming a refrigeration cycle loop of the refrigeration system A.

[0012] Preferably, the refrigeration system B includes a compressor B, a condenser BⅠ, a condenser BⅡ, a liquid reservoir B, a filter B, a thermal expansion valve B, an evaporator B, and a gas-liquid separator B, wherein the outlet end of the compressor B is connected to one end of the condenser BⅠ and the condenser BⅡ respectively through pipelines, the other ends of the condenser BⅠ and the condenser BⅡ are merged and communicated with the liquid reservoir B through a pipeline, the liquid reservoir B is also connected to one end of the filter through a pipeline, the other end of the filter is connected to the inlet of the expansion valve B through a pipeline, the outlet of the expansion valve B is connected to one end of the evaporator B through a pipeline, the other end of the evaporator B is connected to the inlet of the gas-liquid separator B through a pipeline, and the other end of the gas-liquid separator B is connected to the inlet end of the compressor B through a pipeline, thereby forming a refrigeration cycle loop of the refrigeration system B.

[0013] Preferably, the condenser AⅠ and the condenser BⅠ are coupled together and are equipped with an axial flow fan A together.

[0014] Preferably, the condenser AⅡ and the condenser BⅡ are coupled together and are equipped with an axial flow fan B together.

[0015] Preferably, the evaporator A and the evaporator B are coupled together and are equipped with a centrifugal fan.

[0016] Preferably, the fluorine filling nozzle A in the refrigeration system A is connected to the pipeline between the gas-liquid separator A and the compressor A through a bypass.

[0017] Preferably, the fluorine filling nozzle B in the refrigeration system B is connected to the pipeline between the gas-liquid separator B and the compressor B through a bypass.

[0018] Preferably, the protection system is also included, the protection system includes a temperature sensor A, a low-pressure protector A, and a low-pressure protector B, wherein the temperature sensor A is arranged at the air inlet of the coupled evaporator A and the evaporator B to monitor the air inlet temperature of the evaporator, the low-pressure protector A is bypassed and connected to the pipeline between the evaporator A and the compressor A, and the low-pressure protector B is bypassed and connected to the pipeline between the evaporator C and the gas-liquid separator;

[0019] The temperature sensor A, low-pressure protector A, and low-pressure protector B are respectively connected to the control unit, and the control unit controls power supply to compressors A and B in refrigeration systems A and B based on signals from the temperature sensor A and low-pressure protectors A and B.

[0020] Compared with the prior art, the present invention provides a highly efficient double condenser air conditioning device, which has the following beneficial effects:

[0021] 1. The system power supply is turned on according to the evaporation air inlet temperature, which has stable control, saves energy and ensures the normal use of the air conditioner;

[0022] 2. When dual systems need to be started, an interval start time is set to avoid simultaneous start of the compressors and impact on the oil generator;

[0023] 3. When the single refrigeration system is turned on, the refrigeration capacity is increased, the refrigeration power consumption is reduced, the energy efficiency ratio is improved, and energy saving is achieved;

[0024] 4. At higher temperatures, when the single refrigeration system is turned on, the condensing load is reduced, the compressor protection is avoided, and normal refrigeration cannot be performed;

[0025] 5. Effectively reduces the frequency of starting the dual systems and meets the air cooling requirements of the entire operating range.

[0026] The parts not involved in the device are the same as the prior art or can be implemented by the prior art. The invention has a simple structure, is easy to manufacture, has a low cost, a high efficiency, is easy to install, has a low failure rate, a high reliability, is easy to maintain, and can efficiently achieve air conditioning. In addition, it can effectively protect the refrigeration system, is safe and reliable, and saves energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A system schematic diagram of a high-efficiency double-condenser air conditioning device proposed by the present invention. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] Reference Figure 1 , with a high-efficiency double-condenser air conditioning device, including refrigeration system A, refrigeration system B, ventilation system, and electronic control system. Refrigeration system A includes compressor A, condenser AⅠ, condenser AⅡ, liquid storage tank A, filter A, thermal expansion valve A, evaporator A, and gas-liquid separator A;

[0030] Refrigeration system B includes compressor B, condenser BⅠ, condenser BⅡ, liquid storage tank B, filter B, thermal expansion valve B, evaporator B, gas-liquid separator B;

[0031] In refrigeration system A, compressor A, condenser A, liquid receiver A, filter A, thermal expansion valve A, evaporator A, and gas-liquid separator A constitute a refrigeration cycle loop. In refrigeration system B, compressor B, condenser B, liquid receiver B, filter B, thermal expansion valve B, evaporator B, and gas-liquid separator B constitute a refrigeration cycle loop. Condenser AⅠ, condenser AⅡ, condenser BⅠ, condenser BⅡ, evaporator A, and evaporator B realize heat exchange between the refrigeration cycle loop of refrigeration system A and the refrigeration cycle loop of refrigeration system B.

[0032] The ventilation system includes an axial flow fan A for condenser AⅠ in refrigeration system A and condenser BⅠ in refrigeration system, an axial flow fan B for condenser AⅡ in refrigeration system B and condenser BⅡ in refrigeration system, and a centrifugal fan A for supplying air to the room for evaporator A and evaporator B;

[0033] The electric control system includes a power supply and a control unit, wherein the power supply is connected to compressor A, compressor B, axial flow fan A, axial flow fan B and centrifugal fan through the control unit.

[0034] Refrigeration system A includes compressor A, condenser AⅠ, condenser AⅡ, liquid storage A, filter A, thermal expansion valve A, evaporator A, and gas-liquid separator A, wherein the outlet end of compressor A is connected to one end of condenser AⅠ and condenser AⅡ through pipelines, the other ends of condenser AⅠ and condenser AⅡ are connected to the inside of liquid storage A through pipelines, the inside of liquid storage A is also connected to one end of filter A through pipelines, the other end of filter A is connected to the inlet of expansion valve A through pipelines, the outlet of expansion valve A is connected to one end of evaporator A through pipelines, the other end of evaporator A is connected to the inlet of gas-liquid separator A through pipelines, and the other end of gas-liquid separator A is connected to the inlet end of compressor A through pipelines, thereby forming a refrigeration cycle loop of refrigeration system A.

[0035] Refrigeration system B includes compressor B, condenser BⅠ, condenser BⅡ, liquid reservoir B, filter B, thermal expansion valve B, evaporator B, and gas-liquid separator B, wherein the outlet end of compressor B is connected to one end of condenser BⅠ and condenser BⅡ respectively through pipelines, the other ends of condenser BⅠ and condenser BⅡ are connected to the inside of liquid reservoir B through pipelines, the inside of liquid reservoir B is also connected to one end of filter B through pipelines, the other end of filter B is connected to the inlet of expansion valve B through pipelines, the outlet of expansion valve B is connected to one end of evaporator B through pipelines, the other end of evaporator B is connected to the inlet of gas-liquid separator B through pipelines, and the other end of gas-liquid separator B is connected to the inlet end of compressor B through pipelines, thereby forming a refrigeration cycle loop of refrigeration system B.

[0036] Condenser AⅠ and condenser BⅠ are coupled together and are equipped with axial flow fan A together.

[0037] Condenser AⅡ and condenser BⅡ are coupled together and are equipped with axial flow fan B together.

[0038] Evaporator A and evaporator B are coupled together and are equipped with a centrifugal fan.

[0039] The fluorine filling nozzle A in the refrigeration system A is bypassed and connected to the pipeline between the gas-liquid separator A and the compressor A.

[0040] The fluorine filling nozzle B in the refrigeration system B is bypassed and connected to the pipeline between the gas-liquid separator B and the compressor B.

[0041] It also includes a protection system, which includes a temperature sensor A, a low-pressure protector A, and a low-pressure protector B, wherein the temperature sensor A is arranged at the air inlet of the coupled evaporator A and the evaporator B to monitor the air inlet temperature of the evaporator, the low-pressure protector A is bypassed and connected to the pipeline between the evaporator A and the compressor A, and the low-pressure protector B is bypassed and connected to the pipeline between the evaporator C and the gas-liquid separator;

[0042] The temperature sensor A, the low-pressure protector A and the low-pressure protector B are respectively connected to the control unit, and the control unit controls the power supply to the compressors A and B in the refrigeration systems A and B based on the signals of the temperature sensor A and the low-pressure protectors A and B.

[0043] In the present invention:

[0044] Condenser AⅠ2 is coupled with condenser BⅡ11 and is equipped with axial flow fan A17.

[0045] Condenser AⅡ3 is coupled with condenser BⅠ10 and is equipped with axial flow fan B18.

[0046] Evaporator A7 and evaporator B15 are coupled together and share a centrifugal fan 19 .

[0047] The fluorine filling nozzle A20 is connected to the pipeline between the gas-liquid separator A8 and the compressor A1 through a bypass.

[0048] The fluorine filling nozzle B21 is connected to the pipeline between the gas-liquid separator B16 and the compressor B9 through a bypass.

[0049] A temperature sensor 22 is provided at the air inlet after the evaporator A7 and the evaporator B15 are coupled.

[0050] A low-pressure protector A23 is provided between the gas-liquid separator A8 and the compressor A1, and a low-pressure protector A24 is provided between the gas-liquid separator B16 and the compressor B9.

[0051] The present invention will be further described below with reference to the accompanying drawings:

[0052] When the return air temperature is higher than the set temperature by more than +5°C, both refrigeration system A and refrigeration system B work, and the start interval of compressor A1 in refrigeration system A and compressor B9 in refrigeration system B is 10 seconds; when the return air temperature is between the set temperature by +2°C and +5°C, refrigeration system A and refrigeration system B work in turn.

[0053] The temperature sensor 22 monitors the indoor return air temperature of the air-conditioning equipment in real time and feeds back to the control unit 25. The control unit 25 automatically compares the return air temperature with the set temperature. When the return air temperature is higher than the set temperature +5°C, the compressor A1, compressor B9, axial flow fan A17, axial flow fan B18, and centrifugal fan 19 are in operation, and the refrigeration systems A and B start to work; when the return air temperature is between the set temperature +2°C and +5°C, the refrigeration system A or refrigeration system B is switched to work; when the return air temperature reaches the set temperature, the compressor A1, compressor B9, axial flow fan A17 and axial flow fan B18 stop working, and the refrigeration systems A and B stop working, and the centrifugal fan 19 continues to work for ventilation. When the return air pressure in the refrigeration system A is low, the low pressure protector A23 is activated, and the compressor A1 stops working. When the return air pressure in the refrigeration system B is low, the low pressure protector B24 is activated, and the compressor B9 stops working.

[0054] When only refrigeration system A is working, compressor A1 works to compress refrigerant into high-temperature and high-pressure gas, which is divided into two paths, one entering condenser AⅠ2 and the other entering AⅡ3. After heat exchange with air, it is cooled into liquid and enters liquid storage A4. After passing through filter A5, it enters expansion valve A6, and becomes low-temperature and low-pressure refrigerant liquid after throttling. After heat exchange in evaporator A7, it becomes gas, passes through gas-liquid separator A8, and enters compressor A1 again. This cycle repeats. At the same time, axial flow fan A17, axial flow fan B18 and centrifugal fan 19 work continuously to force convection heat exchange and realize refrigeration. Temperature sensor B22 monitors the temperature of the indoor return air of the air-conditioning equipment in real time and feeds back to control unit 25. Control unit 25 automatically compares the return air temperature with the set temperature. When the return air temperature reaches the set temperature, compressor A1, axial flow fan A17 and axial flow fan B18 stop working, refrigeration system A stops working, and centrifugal fan 19 continues to work for ventilation.

[0055] When only refrigeration system B is working, compressor B9 works to compress the refrigerant into high-temperature and high-pressure gas, which is divided into two paths, one entering condenser BⅠ10 and the other entering BⅡ11. After heat exchange with air, it is cooled into liquid and enters liquid storage B12. After passing through filter B13, it enters expansion valve B14, and becomes low-temperature and low-pressure refrigerant liquid after throttling. After heat exchange in evaporator B15, it becomes gas, passes through gas-liquid separator B16, and enters compressor B9 again. This cycle repeats. At the same time, axial flow fan A17, axial flow fan B18 and centrifugal fan 19 continue to work to force convection heat exchange to achieve refrigeration. Temperature sensor B22 monitors the temperature of the indoor return air of the air-conditioning equipment in real time and feeds it back to control unit 25. Control unit 25 automatically compares the return air temperature with the set temperature. When the return air temperature reaches the set temperature, compressor B9, axial flow fan A17 and axial flow fan B18 stop working, refrigeration system B stops working, and centrifugal fan 19 continues to work for ventilation.

[0056] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An efficient double condenser air conditioning device, comprising a refrigeration system A, a refrigeration system B, a ventilation system, an electric control system and a protection system, characterized in that: The refrigeration system A comprises a compressor A, a condenser AⅠ, a condenser AⅡ, a liquid reservoir A, a filter A, a thermal expansion valve A, an evaporator A, and a gas-liquid separator A; the refrigeration system B comprises a compressor B, a condenser BⅠ, a condenser BⅡ, a liquid reservoir B, a filter B, a thermal expansion valve B, an evaporator B, and a gas-liquid separator B; in the refrigeration system A, the compressor A, the condenser A, the liquid reservoir A, the filter A, the thermal expansion valve A, the evaporator A, and the gas-liquid separator A constitute a refrigeration cycle loop; in the refrigeration system B, the compressor B, the condenser B, the liquid reservoir B, the filter B, the thermal expansion valve B, the evaporator B, and the gas-liquid separator B constitute a refrigeration cycle loop. Condenser AⅠ, condenser AⅡ, condenser BⅠ, condenser BⅡ, evaporator A, and evaporator B realize heat exchange between the refrigeration cycle loop of refrigeration system A and the refrigeration cycle loop of refrigeration system B; the ventilation system includes an axial flow fan A equipped for condenser AⅠ in refrigeration system A and condenser BⅠ in refrigeration system, an axial flow fan B equipped for condenser AⅡ in refrigeration system B and condenser BⅡ in refrigeration system, and a centrifugal fan A equipped for evaporator A and evaporator B to supply air to the room; the electric control system includes a power supply and a control unit, wherein the power supply is connected to compressor A, compressor B, axial flow fan A, axial flow fan B, and centrifugal fan through the control unit; The refrigeration system A comprises a compressor A, a condenser AⅠ, a condenser AⅡ, a liquid storage device A, a filter A, a thermal expansion valve A, an evaporator A, and a gas-liquid separator A, wherein the outlet end of the compressor A is connected to one end of the condenser AⅠ and the condenser AⅡ through pipelines, the other ends of the condenser AⅠ and the condenser AⅡ are connected to the liquid storage device A through pipelines, the liquid storage device A is also connected to one end of the filter through pipelines, the other end of the filter is connected to the inlet of the expansion valve A through pipelines, the outlet of the expansion valve A is connected to one end of the evaporator A through pipelines, the other end of the evaporator A is connected to the inlet of the gas-liquid separator A through pipelines, and the other end of the gas-liquid separator A is connected to the inlet end of the compressor A through pipelines, thereby forming a refrigeration cycle loop of the refrigeration system A; The refrigeration system B comprises a compressor B, a condenser BⅠ, a condenser BⅡ, a liquid storage B, a filter B, a thermal expansion valve B, an evaporator B, and a gas-liquid separator B, wherein the outlet end of the compressor B is connected to one end of the condenser BⅠ and the condenser BⅡ respectively through pipelines, the other ends of the condenser BⅠ and the condenser BⅡ are connected to the liquid storage B through a pipeline, the liquid storage B is also connected to one end of the filter through a pipeline, the other end of the filter is connected to the inlet of the expansion valve B through a pipeline, the outlet of the expansion valve B is connected to one end of the evaporator B through a pipeline, the other end of the evaporator B is connected to the inlet of the gas-liquid separator B through a pipeline, and the other end of the gas-liquid separator A is connected to the inlet end of the compressor B through a pipeline, thereby forming a refrigeration cycle loop of the refrigeration system B; The protection system includes a temperature sensor A, a low-pressure protector A, and a low-pressure protector B, wherein the temperature sensor A is arranged at the air inlet of the coupled evaporators A and B to monitor the air inlet temperature of the evaporators, the low-pressure protector A is bypassed and connected to the pipeline between the evaporator A and the compressor A, and the low-pressure protector B is bypassed and connected to the pipeline between the evaporator C and the gas-liquid separator; the temperature sensor A, the low-pressure protector A, and the low-pressure protector B are respectively connected to the control unit, and the control unit controls the power supply to the compressors A and B in the refrigeration systems A and B based on the signals of the temperature sensor A and the low-pressure protectors A and B.

2. The air conditioning device with high efficiency double condensers according to claim 1, characterized in that: The condenser AⅠ and the condenser BⅠ are coupled together and are equipped with an axial flow fan A together.

3. The air conditioning device with high efficiency double condensers according to claim 1, characterized in that: The condenser AⅡ and the condenser BⅡ are coupled together and are equipped with an axial flow fan B together.

4. The air conditioning device with high efficiency double condensers according to claim 1, characterized in that: The evaporator A and the evaporator B are coupled together and are equipped with a centrifugal fan.

5. The air conditioning device with high efficiency double condensers according to claim 1, characterized in that: The fluorine filling nozzle A in the refrigeration system A is connected to the pipeline between the gas-liquid separator A and the compressor A through a bypass.

6. The high-efficiency double condenser air conditioning device according to claim 1, characterized in that: The fluorine filling nozzle B in the refrigeration system B is connected to the pipeline between the gas-liquid separator B and the compressor B through a bypass.

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