WO2013131436A1 - Air-conditioning unit with heat recovery - Google Patents

Description

 Heat recovery air conditioning unit

 Technical field

 The invention belongs to the field of HVAC, and particularly relates to an air conditioning unit that uses a refrigeration system for heat energy recovery.

 Background technique

At present, the recovery of air conditioning exhaust heat energy usually adopts rotary wheel type and plate fin type, and the heat exchange efficiency is low. There is penetration and contact between exhaust air and fresh air, which pollutes fresh air and is unsanitary. In addition, such air conditioning units do not have For cold and heat sources, heat exchange equipment should be added, and a cold and heat source should be provided from the outside.

 Summary of the invention

 The object of the present invention is to provide a heat recovery air conditioning unit with reasonable structure, hygienic cleaning and sufficient energy saving.

The solution of the invention is that the heat recovery air conditioning unit is composed of a blowing box, a fan box, a refrigeration system and a power distribution control system. The air supply box is composed of a fresh air outlet, a return air outlet, a filter, a blower, an evaporator, an air supply port, and an additional functional section. The exhaust fan is composed of an air inlet, a fresh air outlet, a filter, a condenser, an exhaust fan, an air outlet, and an additional functional section. The refrigeration system consists of a compressor, a condenser, an expansion throttle, an evaporator, an auxiliary device, a refrigerant circulation pipe, and a refrigerant. The refrigeration system is a heat pump system or a single cooling system. The power distribution control system is composed of power distribution equipment and automatic control equipment.

When the equipment is running, the outdoor fresh air and return air are sucked into the air supply box by the blower, and after cooling (summer) or heating (winter) of the evaporator of the refrigeration system, the air is processed to the set parameters and sent to each through the air supply system. Air conditioning area. The indoor exhaust and the outdoor fresh air are sucked into the exhaust box by the exhaust fan, and are discharged to the outside after being heated (summer) or cooled (winter) by the condenser of the refrigeration system.

When the refrigeration system works in summer, because the indoor air temperature is lower than that of the outdoor, the condenser of the refrigeration system in the exhaust fan is cooled by the indoor exhaust air and the outdoor fresh air, and the cooling capacity is absorbed by the condenser. In the blower box, the outdoor fresh air and the indoor return air are cooled and cooled by the evaporator of the refrigeration system and sent to the air-conditioned room. In this way, the cooling capacity in the indoor exhaust air is recovered and utilized by the refrigeration cycle of the refrigeration system.

When the refrigeration system works in winter, the condenser of the refrigeration system in the exhaust fan is converted into an evaporator. Since the indoor air temperature is higher than the outdoor, the indoor exhaust air and the outdoor fresh air are used to heat the evaporator of the refrigeration system in the exhaust fan, and the heat is evaporated. Absorbed. In the blower box, the evaporator of the refrigeration system is converted into a condenser, and the outdoor fresh air and the indoor return air are heated by the condenser and sent to the air-conditioned room. In this way, the heat in the indoor exhaust air is recovered and utilized by the heating cycle of the refrigeration system.

The power distribution equipment of the power distribution control system provides power for the refrigeration system, the blower, the exhaust fan, the electric air volume adjustment air outlet, and the automatic control equipment. The automatic control equipment automatically adjusts the refrigeration system, the blower, the exhaust fan, and the electric motor according to the changes of indoor and outdoor air parameters. The air volume adjusts the operating state of the tuyere to ensure efficient and stable operation of the air conditioning unit.

 DRAWINGS

 Figure 1 is a structural diagram of a connected heat recovery air conditioning unit

 Figure 2 is a structural diagram of a split heat recovery air conditioning unit

 Figure 3 is a structural diagram of a split type dual-type heat pump heat recovery air conditioning unit

 Figure 4 is a structural diagram of a heat pump heat recovery air conditioning unit with a connected reheater

 Figure 5 is a structural diagram of a heat pump heat recovery air conditioning unit with a split type reheater

 Figure 6 is a heat pump system diagram (1)

 Figure 7 is a heat pump system diagram (2)

 Figure 8 is a heat pump system diagram (3)

 Figure 9 is a heat pump system diagram (4)

 Figure 10 is a heat pump system diagram (5)

 Figure 11 is a heat pump system diagram (6)

 Figure 12 is a heat pump system diagram (7)

 Figure 13 is a heat pump system diagram (8)

 Figure 14 is a heat pump system diagram (9)

 Figure 15 is a heat pump system diagram (10)

 Figure 16 is a heat pump system diagram (11)

 Figure 17 is the construction diagram of the cylinder type reservoir

 Figure 18 is a diaphragm type reservoir construction diagram

 Figure 19 is a heat pump system diagram (12)

 Figure 20 is a three-control multi-connection heat pump heat recovery air conditioning unit structure diagram

 Figure 21 is a system diagram of two-regulated multi-heat pump heat recovery air conditioning unit

 Figure 22 is a multi-connected reheat heat pump heat recovery air conditioning unit system diagram

 Figure 23 is a multi-connection dual cold source heat pump heat recovery air conditioning unit system diagram

 Description of the reference signs:

 1, air supply box, 2, exhaust box, 3, 21, fresh air outlet, 4, return air, 5, 20, filter, 6 , 51 , 57 , evaporator , 7 , partition , 8 , 67 , 69 , 70 , 72 , refrigerant circulation pipe , 9 , blower , 10 , 13 , exhaust vent , 11 , 12, air supply, 14, electric control box, 15, exhaust fan, 16, compressor, 17, flap, 18, humidifier, 19, condenser, 22, air inlet, 23 , reheater, 24, oil return capillary, 25 Oil separator, 26, water cooler, 27, four-way reversing valve, 29, 31, 37, 40, 58, 89, 93, 97, 103, 104, 106, 109, expansion throttle, 30, 36, 46, 59, 79, 105, accumulator, 28, 32, 42, 47, 60, 68, 71, 88, 92, 96, drying filter, 33, gas-liquid separator, 34, 35, 77, 78 , 80, 81, 86, 87, 90, 91, 94, 95, 108, Solenoid valves, 38, 39, 52, 53 , 54 , 55 , 98 , 99 , 100 , 101 , 102 , check valves , 41 , 43 , 44 , 45, 50, 61, valves, 48, 49, electric control valve, 56, liquid mirror, 62, cylinder housing, 63, piston, 64, orifice tube, 65 , insulation, 66, 73, cylinder end cap, 74, tank, 75, diaphragm, 76, grille, 82, low pressure air pipe, 83, high pressure air pipe, 84, high pressure liquid pipe, 85 , room air conditioner, 107, heat exchanger

 Specific implementation

 Figure 1 is a structural diagram of a connected heat recovery air conditioning unit, which is provided by a blower box 1 and a bellows box 2 The refrigeration system and the power distribution control system are composed of four parts.

 The box body is made of steel plate and other materials, and is insulated with a heat insulating material such as polyurethane. An inspection door is provided on the cabinet to facilitate access and maintenance of the personnel. Air supply box 1 Disconnected from the exhaust box 2 by the partition 7 and placed with insulation material to prevent hurricane and heat exchange between fresh air and exhaust air. Air supply box 1 , air exhaust box 2 Can be made in one piece, the required equipment is installed in a complete box, the integrated air conditioning unit is not convenient to transport, install and repair, but saves materials; can also be made into a segmented combination, with different functions The equipment is placed in several functional sections, and is made into a number of small boxes, which are assembled into a whole after being on the scene. For example: air box In 1 , the fresh air outlet 3, the return air outlet 4, and the filter 5 are made into the inlet air mixing filter section, and so on, and can be made into a blower section, an evaporator section, and a humidifying and blowing section. Air exhaust box 2 It can be made into the inlet air mixing filter section, the condenser section, the cooling main unit, the electric control box section and the exhaust fan section. Each section can be disassembled for easy transportation, installation and overhaul. Air supply box 1 , air exhaust box 2 Other functional sections may be added as needed, such as an additional electric heating section, an air disinfection section, an anechoic section, an inspection section, and the like.

 The main part of the refrigeration system (equipment such as compressor 16) can be placed in the cabinet or outside the cabinet, evaporator 6 and condenser 19 The equipment such as the refrigerant circulation pipe 8 is located in the casing. Evaporator 6, condenser 19 The heat exchanger in the form of a direct expansion structure coil is used to ensure that the refrigerant evaporates and condenses therein, and the heat exchanger is made of a copper tube and an aluminum fin, and the refrigeration system is a single cooling system.

 Electrical control box for distribution control system 14 It is equipped with controller, display, power distribution equipment, etc., which can be hung outside the box, or embedded in the box, or separated from the box. Various power distribution and control equipment and pipelines are distributed in the box. Crossing the partition 7 All kinds of pipelines should be sealed to prevent air leakage.

 During the summer equipment operation, under the action of the blower 9 in the blower box 1, the outdoor high temperature and high humidity fresh air from the fresh air outlet 3, the indoor return air from the return air outlet 4 Enter the box, mix and filter by filter 5, remove the filter through the evaporator 6, and cool down and dehumidify. After reaching the set temperature and humidity, pass the blower 9 and send it from the air supply port 11 to the air-conditioning area. At this time, the air outlet 10 Closed; under the action of the exhaust fan 15 in the exhaust fan 2, the outdoor fresh air enters the box from the fresh air outlet 21, the indoor exhaust air from the air inlet 22, and is filtered by the filter 20 to be filtered by the filter 20 and passed through the condenser. It is heated and heated, and then discharged to the outside through the exhaust fan 15 and the exhaust vent 13 at this time, and the air supply port 12 is closed. In the blower box 1, the evaporator 6 evaporates and absorbs heat, and the air supply is cooled and dehumidified; in the exhaust box 2 In the middle, the condenser 19 is cooled by the indoor and outdoor air, and the amount of cold in the indoor exhaust is recycled.

 When the winter equipment is working, the air conditioning unit sends hot air to the air-conditioned room. Because the refrigeration system is a single cooling system, the air supply port 11 and the air outlet 13 need to be closed. , open the exhaust vent 10, the air supply port 12, the air supply box 1 is converted into a ventilating box, and the air venting box 2 is converted into a blowing box. Under the action of the blower 9 in the blower box 1, the outdoor low temperature fresh air from the fresh air outlet 3 The indoor exhaust air enters the box from the air return port 4, and is filtered by the filter 5 after being mixed. It is cooled and cooled by the evaporator 6, and is discharged to the outside through the blower 9 and the exhaust vent 10; the exhaust fan is arranged in the exhaust box 2 Under the action of 15, the outdoor fresh air enters the tank from the fresh air outlet 21 and the indoor return air from the air inlet 22, and is filtered by the filter 20 to be filtered by the filter and passed through the condenser. It is heated and heated. If the humidity is low, the humidifier 18 is humidified. After the set humidity is reached, it is sent to the air-conditioning area from the air supply port 12 through the water deflector 17 and the exhaust fan 15. In the blower box 1, the evaporator 6 The heat is evaporated to absorb the heat in the exhaust air; in the exhaust box 2, the condenser 19 condenses and releases heat, heating the indoor return air and the outdoor fresh air, and the heat in the indoor exhaust is recycled. Before the winter equipment is running, the exhaust box should be 2 Clean and avoid air conditioning and air pollution.

 In this way, by switching the damper, the single cold cooling system can also be used to deliver cold air in summer and hot air in winter.

 When the equipment is running, the power distribution equipment of the power distribution control system is the refrigeration system, the blower 9 , and the exhaust fan 15 The electric air volume adjustment air outlet and the automatic control system provide power. The refrigeration system is a variable capacity system, the compressor 16 is a variable capacity compressor, the blower 9 and the exhaust fan 15 are frequency conversion speed control fans, and the fresh air outlets 3, 21 , return air outlet 4, exhaust vent 10, 13, air supply port 11, 12, air inlet 22 For the electric air volume adjustment air outlet, the manual and electric dual-purpose air volume adjustment air outlet can also be used, and the automatic control device controls the compressor according to the change of the indoor and outdoor air parameters. The amount of exhaust gas, automatically adjusts the cooling capacity or heating capacity of the refrigeration system, controls the blower 9 and the exhaust fan 15 The speed of rotation and the opening of each tuyere automatically adjust the air volume to ensure efficient and stable operation of the air conditioning unit. The automatic control system has controllers, displays, sensors, actuators, etc., usually using microcomputer control (such as PLC Controller), with autonomous setting parameters, fault detection, automatic alarm and other functions, can be controlled by the touch screen on-site, remote control through computer keyboard, mouse, and network control through LAN, Internet.

During summer operation, the evaporator 6 generates a large amount of low-temperature condensed water. In order to save energy, this part of the low-temperature condensed water can be sprayed into the exhaust box 2 by gravity gravity or water pump pressure for cooling exhaust or condensation. 19. A condensate collecting pan is placed under the evaporator 6, and the condensed water is collected and discharged to the outside of the tank. Air supply box 1 , The air exhaust box 2 can be placed indoors or placed outdoors, such as on the roof, to reduce the floor space. In addition, the direction of the intake and exhaust and the position of the tuyere can also be adjusted as needed.

 In the above device, the air supply box 1 has a return air inlet 4 It can handle indoor return air. The unit is suitable for all air conditioning systems, such as variable air volume air conditioning systems, suitable for large shopping malls and office buildings. When there is no return air outlet 4 At the time, the equipment is a brand-new air-conditioning unit, and the air supply is fresh air, clean and sanitary, and is suitable for hotels and hospitals with high air hygiene standards.

 Figure 2 is a split heat recovery air conditioning unit, the air supply box 1 and The exhaust fan box 2 is separated. When the device is shipped from the factory, the refrigerant circulating pipe 8 connected to the main body of the refrigeration system by the evaporator 6 or the condenser 19 is disconnected and sealed, and the various lines connected to the electric control box 14 are also disconnected. When the field is installed, the refrigerant circulation pipe 8 is connected through a quick joint, and various types of lines are connected to the electric control box 14. The two cabinets can be placed in different positions according to the needs of the user, and the arrangement is more flexible. For example, the air exhaust box 2 can be placed on the roof to save floor space and reduce the noise of the unit.

 Figure 3 is a split type Dual-machine heat pump heat recovery air conditioning unit with two independent refrigeration systems. One of them is a heat pump system for cooling or heating the air, and the other is a single cooling system or a heat pump system for reheating the cooled air, or both for reheating or For cooling; or two separate refrigeration systems are single cooling systems, one for air cooling and the other for air reheat, heating or cooling. Two sets The units are spared each other, and although the equipment is added, the reliability is improved. Therefore, the device has the double cold source, the double heat source, the cold one heat source, the single cold source and the single heat source required for the air conditioner, and can meet various air conditioning working conditions. In Figure 3, the two independent refrigeration systems are all heat pump systems. When the air conditioner needs to be reheated in summer, in the new bellows 1, the evaporator 6 on the left side is converted into a condenser, used as a reheater, and the indoor return air. After being mixed with the outdoor fresh air, the temperature is dehumidified by the right evaporator 6 and then heated by the evaporator 6 on the left side to the set supply air temperature. At this time, in the exhaust box 2, the condenser 19 on the left side is converted. For the evaporator, the indoor exhaust The outdoor fresh air is cooled and cooled, and then sent to the right condenser 19 for condensation heat dissipation, which improves the cooling efficiency, offsets the increased energy consumption due to reheating, and the cooling capacity in the indoor exhaust is recycled. Because there are two refrigeration systems with two evaporators, which are dual cold sources, the right evaporator 6 can be used for outdoor fresh air cooling and dehumidification, with condensed water production, for wet evaporators, the left evaporator 6 can be used for The dry return of indoor return air, non-condensed water generation, is a dry evaporator, so as to achieve independent control of temperature and humidity of air in summer, the process is: right return air outlet 4 is closed or canceled, outdoor high temperature and humid fresh air from fresh air outlet 3 After entering, passing the dehumidification of the right evaporator 6 to become dry air, mixing with the indoor return air entering the left return air inlet 4, and then cooling the temperature through the left evaporator 6, reaching the set temperature and then feeding to the air conditioner. Room due to The right evaporator 6 is used for cooling and dehumidification, and its evaporation temperature is about 6 ° C, while the left evaporator 6 is not used for dehumidification, and its evaporation temperature can be increased to about 16 ° C. The efficiency of the refrigeration system has been significantly improved to achieve energy saving. The above equipment can also be made into the connected type shown in Figure 1. The air conditioning unit and the two sets of refrigeration systems are under the precise control of the automatic control equipment to ensure coordinated, efficient and stable operation.

 Figure 4 is a heat pump heat recovery air conditioning unit with a reheater, also known as a reheat heat pump heat recovery air conditioning unit, with a The evaporator 6 and a reheater 23, wherein the reheater 23 can be converted into an evaporator to form a double evaporator, so that the device can not only have a summer reheat function, but also can realize In summer, the temperature and humidity of the air are independently controlled. When the reheat function is used, the return air opening 4 between the evaporator 6 and the reheater 23 is closed, and the indoor return air enters from the right return air outlet 4, and the outdoor fresh air is supplied from the fresh air outlet 3 After entering, the two are mixed, first dehumidified by the temperature of the evaporator 6, and then heated by the reheater 23 to the set supply air temperature. When the summer temperature and humidity are independently controlled, it is located The return air opening 4 between the evaporator 6 and the reheater 23 is opened, the reheater 23 is converted into an evaporator, the right return air outlet 4 is closed, and the outdoor hot and humid fresh air enters from the fresh air outlet 3 through The evaporator 6 is cooled and dehumidified to become dry air, mixed with the indoor return air entering the left return air inlet 4, and then passed through the dry cooling of the reheater 23 to reach the set temperature and then sent to the air-conditioned room.

 Figure 5 is a split heat pump heat recovery air conditioning unit with a reheater. The air supply box 1 is separated from the air exhaust box 2, It is flexible in layout, making efficient use of space, and easy to transport and install.

 Fig. 6 is a heat pump system diagram of the above heat recovery air conditioning unit. When the system performs a refrigeration cycle, the refrigerant cycle process is: compressor 16 → oil separator 25 → water cooler 26 → four-way switching valve 27 → condenser 19 → drying filter 28 → expansion throttle 29 → reservoir 30 → expansion throttle 31 → drying filter 32 → evaporator 6→ four-way reversing valve 27→ gas-liquid separator 33→ Compressor 16 ; When the system performs a heating cycle, the refrigerant cycle is: compressor 16 → oil separator 25 → water cooler 26 → four-way switching valve 27 → evaporator 6 → drying filter 32 → expansion throttle 31 → reservoir 30 → expansion throttle 29 → drying filter 28 → condenser 19→ four-way reversing valve 27→ gas-liquid separator 33→ Compressor 16 .

 The high pressure, high temperature gaseous refrigerant discharged from the compressor 16 is separated from the lubricating oil in the oil separator 25 through the oil return capillary 24 The lubricating oil is returned to the compressor 16, and the lubricating oil can also be refluxed by other means.

The water cooler 26 is provided with a heater. When the high-temperature refrigerant passes, the tap water is heated to provide the user with domestic hot water, and the fuel cost is saved. At the same time, since the heat of the refrigerant is absorbed by the tap water, the fresh air volume for condensing the refrigerant is used. It can reduce the power consumption of the fan. The water cooler 26 can be in the form of a spiral tube type, a shell tube type, a sleeve type or the like, and a closed type pressurized container or an open type pressureless container is used. In Fig. 6, an open type pressureless container is used, which is away from The closer the compressor 16 exhausts, the better the heat recovery. in winter, The water cooler 26 usually stops working, does not produce hot water, and the condensation heat of the refrigerant is used for heating the air conditioner. If the water cooler 25 can also produce hot water in winter, it is necessary to increase the system capacity and increase the heat generation, such as: increasing the compressor. The power of 16 increases the amount of fresh air outside the exhaust box 2 and the amount of exhaust air of the exhaust fan 15.

 The four-way reversing valve 27 is used for the conversion of the cooling and heating conditions of the heat pump system, and it can also be replaced by a solenoid valve or a check valve.

The expansion restrictor 29, 31 is a one-way expansion throttle. When cooling, the expansion throttle 29 is fully open and 31 throttled. When heating, the expansion throttle 31 is fully open and 29 throttled, usually using electronic expansion. Valves, regulating refrigerant flow is faster and more accurate, and other expansion restrictors, such as capillary tubes, can be used for small systems.

 The accumulator 30 is used to store excess high pressure liquid refrigerant when the heat pump system load changes.

 The gas-liquid separator 33 is used for the separation of the gaseous and liquid refrigerants to ensure that the refrigerant entering the compressor is in a gaseous state to avoid liquid hammering.

The compressor 16 is a variable capacity compressor such as a variable frequency rotor type, a scroll type, or a screw type compressor. When the system cooling capacity and heating capacity change, the compressor 16 also changes the capacity output in time to achieve energy-saving operation. when There are multiple compressors in the heat pump system. 16 When operating in parallel, the compressor 16 All of them use fixed-capacity compressors, or all of them use variable-capacity compressors, or a combination of variable-capacity compressors and fixed-capacity compressors. The above combination can realize variable-capacity operation and achieve energy-saving.

 In addition, in the heat pump system, in addition to the oil return capillary 24, In addition to the auxiliary devices such as the oil separator 25, the four-way switching valve 27, the accumulator 30, the drying filter 28, 32, and the gas-liquid separator 33, other auxiliary equipment such as a sight glass and a regenerator are provided. , recooler, temperature, pressure sensor, etc. The automatic control system automatically adjusts the operating status of the system according to changes in system temperature and pressure, and maintains efficient operation of the heat pump system.

 Figure 7 is a heat pump system diagram of a reheat heat pump heat recovery air conditioning unit with a reheater 23, check valves 38, 39 It can also be replaced by a solenoid valve or an electric control valve. When the system performs a reheat refrigeration cycle, the refrigerant cycle process is: compressor 16 → oil separator 25 → water cooler 26 → four-way reversing valve 27 → condenser 19 → reheater 23 → Check valve 38 → Dry filter 28 → Expansion restrictor 29 → Reservoir 36 → Expansion throttle 31 → Dry filter 32 → Evaporator 6 → Four-way selector valve 27 → Gas-liquid separator 33 → Compression Machine 16; When the system performs a heating cycle, the refrigerant cycle is: compressor 16 → oil separator 25 → water cooler 26 → four-way switching valve 27 → evaporator 6 → drying filter 32 → expansion throttle 31 → reservoir 30 → expansion throttle 29 → drying filter 28 → condenser 19→ four-way reversing valve 27→ gas-liquid separator 33→ Compressor 16 .

 When the refrigeration cycle, the high temperature and high pressure refrigerant is The condenser 19 is condensed by the indoor exhaust air and the outdoor fresh air for the first time, takes away a part of the heat of condensation, and then enters the reheater 23 for the second condensation, thereby completing the entire condensation process, which is precisely controlled by the automatic control system. . In this process, the reheater 23 is in series with the condenser 19 and the evaporator 6. . After the indoor return air and the outdoor fresh air are cooled and dehumidified by the evaporator 6, the reheater 23 is reheated to the supply air temperature, and the required heat is the heat of condensation discharged from the heat pump system without additional heat. The indoor exhaust is used to cool the condenser 19, and the amount of cold therein is recycled, achieving energy saving.

 When the heating cycle is repeated, the evaporator 6 is converted into a condenser for heating the air, opening The expansion restrictor 37, a part of the refrigerant is throttled as a low-temperature refrigerant, and is exchanged with the liquid refrigerant having a relatively high temperature in the accumulator 36 to evaporate and absorb heat, and the temperature is increased. Then, open the solenoid valve 34, A part of the refrigerant enters the scroll compressor 16 with the intermediate interface to perform the air-filling compensation; the electromagnetic valve 35 is opened. A portion of the higher temperature refrigerant enters the gas-liquid separator 33, which improves the suction temperature of the compressor 16, improves the operating conditions, and improves the heating efficiency of the heat pump system in winter.

 Figure 8 is a heat pump system diagram of another reheat heat pump heat recovery air conditioning unit, valves 41, 43, 44, 45 A solenoid valve or an electric control valve can be used. When the system performs a reheat refrigeration cycle, the valves 41, 44, the expansion throttle 29 are closed, and the rest are opened, and the expansion throttle 31 is throttled. The refrigerant circulation process is: compressor 16 → oil separator 25 → four-way switching valve 27 → condenser 19 → drying filter 28 → expansion throttle 40 → reheater 23 → valve 43 → reservoir 30 → expansion restrictor 31 → drying filter 32 → evaporator 6 → valve 45 → four-way switching valve 27 → gas-liquid separator 33 → compressor 16 .

 When the system performs the heating cycle, the valve 45, the expansion restrictor 29, 31 are opened, the rest are closed, and the expansion throttle 29 is throttled. The refrigerant circulation process is: compressor 16 → oil separator 25 → four-way reversing valve 27 → valve 45 →Evaporator 6→Drying filter 32→Expansion restrictor 31→Accumulator 30→Expansion restrictor 29→Drying filter 28→Condenser 19→Four-way reversing valve 27→Gas-liquid separator 33→Compression Machine 16, when the valve 43, 45, the expansion throttle 40 is closed, the valves 41, 44 are opened, and the reheater 23 can also be used as a condenser to heat the air, and the evaporator 6 is used alternately.

 When the system performs a non-reheat refrigeration cycle, valves 44, 45, expansion restrictors 29, 31, 40 open, valve 41 , 43 is closed, the expansion restrictors 31, 40 are throttled, and the refrigerant circulation process is: compressor 16 → oil separator 25 → four-way switching valve 27 → condenser 19 → drying filter 28, here two-way, one way → expansion throttle 40 → reheater 23 → valve 44, another way →Expansion restrictor 29→Accumulator 30→Expansion restrictor 31→Drying filter 32→Evaporator 6→Valve 45, where the two channels merge → Four-way reversing valve 27→Gas-liquid separator 33→ Compression Machine 16, The reheater 23 is converted into an evaporator, the system forms two evaporators, has a dual cold source, and the reheater 23 and the evaporator 6 are converted into a parallel relationship by adjusting the expansion restrictors 29, 31, 40 and the valve 44, 45 Opening degree and other means The evaporation temperature of the evaporator 6 is about 6 ° C, and the evaporation temperature of the reheater 23 is about 16 ° C. The fresh air can be cooled and dehumidified by the evaporator 6, and the indoor return air is dry-cooled by the reheater 23, thereby realizing Independent control of the temperature and humidity of the air.

 Figure 9 is also a heat pump system diagram of a reheat heat pump heat recovery air conditioning unit. When the system performs a reheat refrigeration cycle, the valve 44 Closed, the rest is opened, the expansion restrictor 31 acts as a throttling, and the refrigerant circulation process is: compressor 16 → oil separator 25 → four-way reversing valve 27, here two-way, one way → electric regulating valve 48 →Condenser 19→Drying filter 28→Expansion restrictor 29, the other way → Electric regulating valve 49 → Reheater 23 → Drying filter 47 → Expansion restrictor 40, the two roads meet here → reservoir 46 → expansion restrictor 31 → drying filter 32 → evaporator 6 → valve 45 → four-way switching valve 27 → gas-liquid separator 33 → compressor 16 , in the process, Both the condenser 19 and the reheater 23 are condensers and are in a parallel relationship.

 When the system performs a heating cycle, the valves 44, 45, the expansion restrictors 29, 31, 40, and the electric regulating valve 48 are opened. The electric regulating valve 49 is closed, the expansion restrictor 29 is throttled, and the reheater 23 and the evaporator 6 are converted into a condenser to heat the air to form a parallel relationship. The refrigerant circulation process is: the compressor 16 → Oil separator 25 → four-way reversing valve 27, here two-way, one way → valve 45 → evaporator 6 → drying filter 32 → expansion throttle 31 → accumulator 46, another way → valve 44 → Reheater 23 → Drying Filter 47 → Expansion Tractor 40, where the two channels meet → Expansion damper 29 → Drying filter 28 → Condenser 19 → Electric regulating valve 48 → Four-way selector valve 27 → gas-liquid separator 33 → compressor 16 . When the valve 44 is opened and 45 is closed, the reheater 23 acts as a condenser to separately heat the air, and the evaporator 6 does not operate; when the valve 45 Open, 44 closed, evaporator 6 as a condenser to separately heat the air, reheater 23 does not work. During the winter heating cycle, the expansion throttle 37, the solenoid valves 34, 35 are opened, The flash steam in the accumulator 46 enters the scroll compressor 16 with the intermediate port to perform the aeration supplement, and may also enter the gas-liquid separator 33, thereby improving the suction temperature of the compressor 16, and improving the temperature. Operating conditions, The heat pump system has also improved heating efficiency in winter.

 When the system performs a non-reheating refrigeration cycle, the electric regulating valve 49 is closed, and the rest is opened, and the expansion restrictors 31, 40 are throttled. The refrigerant circulation process is as follows: compressor 16 → oil separator 25 → four-way reversing valve 27 → electric regulating valve 48 →Condenser 19→Drying filter 28→Expansion restrictor 29, here two-way, one way→Expansion restrictor 40→Drying filter 47→Reheater 23→Valve 44, another way → reservoir 46 → expansion restrictor 31 → drying filter 32 → evaporator 6 → valve 45, where the two channels meet → four-way switching valve 27 → gas-liquid separator 33 → compressor 16 The reheater 23 is converted into an evaporator, the system forms two evaporators, has a double cold source, can be cooled and dehumidified by the evaporator 6 for fresh air, and is re-heated by the reheater 23 for indoor return air or indoor return air and cooling and dehumidification. The outdoor mixed air of the fresh air is dry-cooled, thereby achieving independent control of the temperature and humidity of the air.

 Figure 10 The heat pump system has two evaporators 6, 51, which are connected in parallel in the system. It can also be called parallel double-cooled source heat pump. The heat recovery air conditioning unit can realize the independent control of the temperature and humidity of the air when the refrigeration cycle is performed. The refrigerant circulation process is: the compressor 16 → oil separator 25 → four-way switching valve 27 → condenser 19 → drying filter 28 → expansion throttle 29, here two-way, one way → valve 50 → evaporator 51 → valve 44, another way → Reservoir 30 → Expansion damper 31 → Drying filter 32 → Evaporator 6 → Valve 45, where the two channels meet → Four-way directional control valve 27 → Gas-liquid separator 33 → Compressor 16 . High temperature and high pressure liquid refrigerant first passed The first throttling of the expansion restrictor 29 becomes a low-temperature low-pressure liquid refrigerant having an evaporation temperature of about 16 ° C, a part of which flows into the evaporator 51, and a part of which is throttled by the expansion throttle 31 to become an evaporation temperature. The low-temperature low-pressure liquid refrigerant of about 6 °C enters the evaporator 6, and cools and dehumidifies the outdoor high-temperature and high-humidity air, and then directly sends it into the air-conditioned room, or mixes with the indoor return air, and then cools down through the evaporator 51. And then sent to the air-conditioned room. The low-temperature low-pressure liquid refrigerant with an evaporation temperature of about 16 °C flows through the evaporator 51 to treat the indoor air returning, or the indoor mixed air of the indoor return air and the cooling and dehumidification, and only performs the cooling treatment without dehumidification treatment, and finally Transfer to an air-conditioned room.

 When the system performs a heating cycle, the expansion restrictor 29 acts as a throttle, and the evaporators 6, 51 Converted to a condenser to heat the air, both can work at the same time, or work separately.

 Figure 11 is also a parallel double cold source heat pump heat recovery air conditioning unit. The expansion restrictor 31 is an evaporator 6 A low-temperature low-pressure liquid refrigerant having an evaporation temperature of about 6 ° C is provided to cool and dehumidify the outdoor high-temperature and high-humidity air; the expansion throttle 40 is an evaporator 51 Providing a low-temperature low-pressure liquid refrigerant with an evaporation temperature of about 16 ° C, and only performing a cooling treatment on the indoor return air, or the indoor mixed air after the indoor return air and the cooling and dehumidification, without performing dehumidification treatment, thereby realizing the air Independent control of temperature and humidity.

 Figure 12 The heat pump system is similar to Figure 10, but due to the addition of the check valve, When the temperature and humidity are independently controlled, the expansion throttle 29 has a better throttling effect.

 In the heat pump system, the two evaporators 6, 57 are in series relationship, which can also be called a series double cold source heat pump heat recovery air conditioning unit. When the system performs a refrigeration cycle, the expansion restrictor 31 acts as a throttling, and the refrigerant cycle process is: compressor 16 → Oil separator 25 → Four-way switching valve 27 → Condenser 19 → Drying filter 28 → Expansion restrictor 29 → Reservoir 30 → Expansion throttle 31 → Drying filter 32 → Evaporator 6 → Evaporator 57→ four-way reversing valve 27→ gas-liquid separator 33→ The compressor 16 and the expansion throttle 31 are evaporators 6 A low-temperature low-pressure liquid refrigerant with an evaporation temperature of about 6 ° C is provided, and the outdoor high-temperature and high-humidity air is cooled and dehumidified, and then the refrigerant becomes a gas-liquid mixture of about 16 ° C, enters the evaporator 57, and is secondarily evaporated. The indoor air return, or the indoor return air and the outdoor fresh air mixed air after the cooling and dehumidification are dry-cooled, so the double cold source serial split control mode can also achieve independent control of temperature and humidity; During the heating cycle, the expansion throttle 29 is throttled, the two evaporators 6, 57 are converted into condensers, and the refrigerant cycle is: compressor 16 → Oil separator 25 → Four-way switching valve 27 → Evaporator 57 → Evaporator 6 → Drying filter 32 → Expansion restrictor 31 → Reservoir 30 → Expansion throttle 29 → Drying filter 28 → Condenser 19→ four-way reversing valve 27→ gas-liquid separator 33→ Compressor 16, the outdoor cold air is first heated by the evaporator 6, mixed with the indoor return air, and then reheated by the evaporator 57.

 Figure 14 is also a series of dual cold source heat pump heat recovery air conditioning units, but with Different from Fig. 13, the one-way expansion restrictor 29 is replaced with a two-way expansion throttle 58. When the system performs a refrigeration cycle, the refrigerant cycle is: compressor 16 → Oil separator 25 → Four-way switching valve 27 → Condenser 19 → Drying filter 28 → Expansion restrictor 58 → Drying filter 28 → Evaporator 57 → Drying filter 32 → Expansion restrictor 31 → Drying filtration 32 → evaporator 6 → four-way reversing valve 27 → gas-liquid separator 33 → The compressor 16 and the expansion restrictor 58 are evaporators 57 Providing a low-temperature low-pressure liquid refrigerant with an evaporation temperature of about 16 ° C, and performing dry cooling treatment on the indoor return air, or the indoor fresh air mixed air after cooling and dehumidification, a part of the liquid refrigerant absorbs heat and evaporates, and then the refrigerant It becomes a gas-liquid mixture of about 16 ° C, and then passes through the secondary depth throttling of the expansion restrictor 31 to become a low-temperature low-pressure liquid refrigerant having an evaporation temperature of about 6 ° C. In the evaporator 6, secondary evaporation, cooling and dehumidifying the outdoor high temperature and high humidity air, can also achieve independent control of temperature and humidity; when the system performs heating cycle, The expansion restrictor 58 acts as a throttle, the expansion throttle 31 is fully open, the two evaporators 6, 57 are converted into a condenser, and the refrigerant cycle is: compressor 16 → oil separator 25 → four-way switching valve 27 → evaporator 6 → drying filter 32 → expansion throttle 31 → drying filter 32 → evaporator 57 → drying filter 28 → expansion throttle 58 → dry filtration 28 → condenser 19 → four-way switching valve 27 → gas-liquid separator 33 → Compressor 16, the outdoor cold air is first heated by the evaporator 6, mixed with the indoor return air, and then reheated by the evaporator 57. when When the two-way expansion restrictor 58 is replaced with a one-way expansion throttle, two unidirectional expansion throttles shall be provided, and the throttle direction shall be reversed during installation.

 In the heat pump system shown in Figure 15, The expansion restrictor 58 is a bi-directional expansion restrictor which replaces the one-way expansion restrictor 29, 31 of Fig. 13, and the accumulator 59 is of a cylinder type or a diaphragm type. The accumulator, which replaces the accumulator 30 and the desiccant filters 28, 32 in Fig. 13, has the same function as the system of Fig. 13, but the refrigeration system is simplified. Cylinder type, diaphragm type The construction of the reservoir is shown in Figures 17 and 18.

 The function of the heat pump system shown in Figure 16 is the same as that of Figure 8, due to the use of a bi-directional expansion restrictor 58, cylinder or diaphragm. With the reservoir 59, the system is simplified.

 Figure 17 is a structural view of a cylinder type reservoir, which is composed of a cylinder casing 62, a piston 63, cylinder end caps 66, 73, The drying filter 68, 71, the refrigerant circulation pipes 67, 69, 70, 72, etc. are installed in the refrigerant circulation line between the evaporator and the condenser, and the refrigerant circulation pipes 67, 72 Connected to the evaporator and the condenser respectively, the refrigerant circulation pipes 69 and 70 are respectively connected to the bidirectional expansion restrictor, and the refrigerant circulation pipes 67, 69 and 70, 72 are respectively connected to the cylinder end caps. On the 66, 73, the cylinder is connected, and the nozzle is close to the bottom of the cylinder end cover. Installed in the cylinder end caps 66, 73 The drying filter 68, 71 is composed of a desiccant and a filter, and the desiccant may be a molecular sieve or the like, and the filter may be a filter or the like for filtering impurities and moisture in the refrigerant. Piston 63 It is possible to slide in the cylinder. When the system performs the refrigeration cycle, the high-pressure liquid refrigerant from the condenser enters the cylinder end cap 73 through the refrigerant circulation pipe 72, and is treated by the drying filter 71. Into the cylinder, a part of the excess high-pressure liquid refrigerant is stored in the cylinder, and a part is again introduced into the bi-directional expansion restrictor through the refrigerant circulation pipe 70, and is throttled into a low-pressure liquid refrigerant through the refrigerant circulation pipe. From the cylinder end cap 66 back to the cylinder, and finally through the drying filter 68, the refrigerant circulation pipe 67 It flows out of the cylinder and enters the evaporator. Since one end of the cylinder is a high-pressure liquid refrigerant, and the other end is a low-pressure liquid refrigerant, a pressure difference is formed on both sides of the piston 63, thereby pushing the piston 63. Moving from the high pressure end to the low pressure end, the figure moves from right to left, up to the cylinder end cap 66. Thus on the right side of the piston 63 and the cylinder end cap 73 A large cavity space is formed between them to ensure that excess high-pressure liquid refrigerant is stored therein. Piston 63 with a fine orifice tube 64, a small amount of high pressure liquid refrigerant from the orifice tube 64 Throttle to the low pressure side, and a small amount of high pressure liquid refrigerant is throttled from the fitting gap between the piston 63 and the cylinder wall to the low pressure side. Orifice tube 64 The ends may have a downwardly curved small tube which extends below the liquid level to ensure that the liquid refrigerant at the bottom is throttled and has an insulating layer in the piston 63. Can reduce heat transfer. When the system performs the heating cycle, the refrigerant flows in the reverse direction, the left side of the piston 63 becomes the high pressure side, and the right side becomes the low pressure side, which is pushed to the right end, to the cylinder end cover 73. The excess high pressure liquid refrigerant is then stored in the cylinder on the left side of the piston 63.

 Figure 18 is a structural view of a diaphragm type reservoir, which is composed of a tank body 74, a diaphragm 75, a drying filter 68, 71, and a refrigerant circulation pipe. 67, 69, 70, 72, etc. It is connected in the same way as the cylinder type reservoir in Figure 16 in the refrigeration system. The diaphragm 75 is a high-strength, non-leaking elastic or flexible material that is located in the tank At the center of 74, divide it into two separate spaces. When the system is shut down and the pressure is balanced, the diaphragm 75 is in a relaxed state of any shape. A refrigerant circulation pipe 67, 69 is connected to the lower portion of the tank 74. , 70 , 72 and drying filters 68 , 71 , the refrigerant circulation pipes 67 , 69 are connected to the left space of the diaphragm 75 , and the refrigerant circulation pipes 70 , 72 and the diaphragm 75 . The space on the right side is connected, and the orifice tube 64 connects the spaces on both sides of the diaphragm 75. When the refrigerant circulation pipes 70, 72 are connected to the high pressure end, the high pressure liquid refrigerant enters through the refrigerant circulation pipe 72, and is After the drying filter 71 is processed, it enters the tank 74, and a part of the excess high-pressure liquid refrigerant is stored therein, and a part passes through the refrigerant circulation pipe. Entering the bi-directional expansion restrictor, it is throttled into a low-pressure liquid refrigerant, flows back into the tank through the refrigerant circulation pipe 69, and finally passes through the drying filter 68 and the refrigerant circulation pipe 67. It flows out of the cylinder and enters the evaporator. Since the right side is a high-pressure liquid refrigerant, the left side is a low-pressure liquid refrigerant, and a pressure difference is formed on both sides of the diaphragm 75, and the diaphragm 75 extends or expands to the left, closely adhering to the tank 74 The inner wall forms a large space on the right side, in which the high-pressure liquid refrigerant circulates, and the excess portion is stored therein; conversely, the refrigerant flows in the opposite direction, and the diaphragm 75 expands to the right. Grille 76 blocks diaphragm 75 Stretch downwards to prevent blockage of the refrigerant circulation pipe nozzle.

 The accumulator 79 in Figure 19 is connected to the bi-directional expansion throttle valve via solenoid valves 80, 81. Both ends are located above it and are located below the condenser 19 and the evaporator 6. When the refrigeration cycle is performed, when the condenser 19 is used as a condenser, the solenoid valves 77, 81 are opened, and the rest are closed, and the solenoid valve 77 It is connected to the inlet end of the condenser 19 and communicates with the liquid level of the refrigerant in the accumulator 79 to ensure that the high-pressure liquid refrigerant enters and exits the accumulator by its own gravity. Without flashing or vaporization of the liquid refrigerant. When the heating cycle is performed, when the evaporator 6 is used as a condenser, the solenoid valves 78, 80 are opened, the rest are closed, and the solenoid valve 78 is connected. The inlet end of the evaporator 6 communicates with the liquid level of the refrigerant in the accumulator 79 to ensure that the high-pressure liquid refrigerant enters and exits the accumulator 79 by its own gravity without flashing or vaporizing the liquid refrigerant. If solenoid valve 78 Close, the expansion throttle 37, the solenoid valves 34, 35 are opened, and the flash steam generated by the accumulator 79 can be used to increase the air supply and improve the intake temperature of the compressor 16 to improve the operating conditions and improve the operating conditions. Heat pump system winter heating efficiency. The reservoir 79 can be referred to as a gravity flow reservoir.

 Figure 20 shows a three-control multi-connected heat pump heat recovery air conditioning unit. In the figure, a wind exhaust box 2 has a blower box 1 , a room air conditioner 85, it can bring more units. The reheater 23 is connected in parallel with the evaporator 6 on the refrigeration system. When the solenoid valves 91, 95 are closed, 90, 94 are opened, the expansion restrictors 93, 97 Throttle is turned on, reheater 23, evaporator 6 is converted to evaporator for cooling air; when solenoid valves 90, 94 are closed, 91, 95 are open, expansion restrictor 93, 97 Open but not throttled, the reheater 23, the evaporator 6 is converted into a condenser for heating the air; thus, by means of valve switching, adjusting the opening of the expansion throttle, etc., the reheater 23 and the evaporator 6 Can be converted to a dry evaporator, or a wet evaporator, or a condenser, dry air cooling, or dehumidification, or heating, or reheat, so the air box 1 Not only can reheat air treatment, but also independent control of temperature and humidity of air.

 Figure 21 is a two-control multi-connected heat pump heat recovery air conditioning unit, which is combined with Figure 20 The functions of the heat pump heat recovery air conditioning unit are the same, and the air can be reheated or the temperature and humidity can be independently controlled by means of valve switching, adjusting the opening degree of the expansion throttle, and the like.

 Figure 22 is a multi-reheat heat pump heat recovery air conditioning unit, which is in The single-type reheat heat pump heat recovery air conditioning unit of Figures 4, 5 and 9 has a plurality of air supply boxes 1 and a fan box 2, and the scope and function are expanded. When a reheater in a blower box 1 23 When the evaporator 6 is heating, the reheater 23 in the other blower box 1 can be converted into an evaporator for cooling, and it also has three-control and two-control multi-connection The heat pump heat recovery air conditioning unit can simultaneously cool and heat.

 Figure 23 is a multi-connected dual cold source heat pump heat recovery air conditioning unit, which is in The single-type double-cooled-source heat pump heat recovery air-conditioning unit of Figures 10, 11, 12, 13, and 14 is provided with a plurality of blower boxes 1 and a blower box 2, and the scope and function are expanded.

 Similarly, the single-unit heat pump heat recovery air conditioning units of Figures 7, 8, 15, and 16 can also be made multi-connected.

The above description is only a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, equivalent changes, and modifications made to the above embodiments in accordance with the technical spirit of the present invention are within the scope of the present invention.

Claims (10)

Heat recovery air conditioning unit, which is composed of air supply box, exhaust air box, refrigeration system and power distribution control system. The air supply box has fresh air outlet, return air outlet, air supply port, evaporator, blower, filter and additional functional sections. The exhaust box has an air inlet, a fresh air outlet, an air outlet, a condenser, an exhaust fan, a filter, and an additional functional section; the refrigeration system is a compressor, a condenser, an expansion throttle, an evaporator, an auxiliary device, Refrigerant circulation pipe and refrigerant composition; distribution control system is composed of power distribution equipment and automatic control equipment, which is characterized in that the fresh air outlet is connected to the outdoor air, the return air inlet is connected to the indoor return air, and the air supply port is connected to the indoor air conditioning system air supply duct. The air inlet is connected to the indoor air exhaust, the air outlet is connected to the outdoor air, the air supply box can be brought back to the air outlet, or the air return port can be omitted; the outdoor fresh air and the indoor return air are sucked into the air supply box by the blower, through the filter, the evaporator, The processing of the additional functional segment reaches the set air conditioning parameter and is sent to the air conditioning area through the air supply port; the outdoor fresh air and the indoor exhaust air are sucked into the exhaust air box by the exhaust fan, and pass through the filter and the condenser. After the additional functional sections are processed, they are discharged to the outside through the exhaust vent; the air supply box and the exhaust ventilator are integrated or segmented, and the air supply box and the exhaust box are sealed and closed; The system can be a heat pump system or a single cooling system. The evaporator is installed in the air supply box. When cooling, it is used to cool the air. When heating, it is converted into a condenser for heating the air. Its condenser Installed in the exhaust ventilator, when cooling, the condensing heat is taken away by the indoor exhaust and the outdoor fresh air. When heating, it is converted into an evaporator to absorb the heat in the indoor exhaust and the outdoor fresh air. Therefore, the indoor exhaust air is cold. The quantity and heat are recovered to achieve the purpose of energy saving; the compressor and auxiliary device of the refrigeration system are installed in the air exhaust box, or installed in the air supply box, and can also be installed outside the air supply box and the air exhaust box; The electric control box of the control system is embedded in the air exhaust box or the air supply box, or is hung outside the air supply box or the air exhaust box, or is arranged separately from the air supply box and the air exhaust box. The heat recovery air conditioning unit according to claim 1, wherein the connection between the air distribution box and the air supply box is integral, split, and multi-connected, and correspondingly, the refrigeration system may be integral and divided. In the form of multiples, they can be placed indoors or outdoors. The heat recovery air conditioning unit according to claim 1, wherein when the refrigeration system is a single cooling system, the air supply box sends cold air in the summer, and the air distribution box can be converted into a air supply box by using a switching of the air valve for Send hot air in winter. The heat recovery air conditioning unit according to claim 1, wherein the dual-type heat pump heat recovery air conditioning unit has two independent refrigeration systems, one of which is a heat pump system for air cooling or heating, and the other The set is a single cold or heat pump system for reheating, heating or cooling of air, or two separate refrigeration systems are single cooling systems, one for air cooling and the other for air reheating and heating Or cooling, so that a variety of cold and heat source combinations can be provided for the air conditioner, which can not only cool, reheat or heat the air, but also convert into a double cold source to achieve independent control of the temperature and humidity of the air. The heat recovery air conditioning unit according to claim 1, wherein the reheat type heat pump heat recovery air conditioning unit has a reheater, and the reheater is connected in parallel or in series with the condenser and the evaporator, and the reheater is also It can be converted into an evaporator, which can not only reheat or heat the air, but also convert it into a double cold source to achieve independent control of the temperature and humidity of the air. The reheater and the evaporator can work simultaneously, or separately. Work, the unit can be made into a single or multiple. The heat recovery air conditioning unit according to claim 1, wherein the double cold source heat pump heat recovery air conditioning unit has two evaporators, and the two are connected in parallel or in series in the refrigeration system to realize independent control of temperature and humidity of the air. Processing, the two evaporators can also be converted into a condenser for heating the air, the two can work at the same time, or work separately, the unit can be made into a single or multiple. The heat recovery air conditioning unit according to claim 1, wherein in the three-control and two-control multi-connected heat pump heat recovery air conditioning unit, the reheater and the evaporator are connected in parallel to the refrigeration system, and the reheater and the evaporator are both It can be converted into a dry evaporator or a wet evaporator or a condenser. The air can be dry-cooled or cooled or dehumidified, or heated. Therefore, the unit can not only reheat the air but also achieve the temperature and humidity of the air. Independent control processing. The heat recovery air conditioning unit is composed of a blower box, a blower box, a refrigeration system and a power distribution control system, and one of the refrigeration systems has a cylinder type liquid storage device capable of storing liquid refrigerant, and is characterized in that the cylinder type The liquid storage device is mainly composed of a cylinder casing, a piston, a cylinder end cover, a drying filter and a refrigerant circulation pipe. The cylinder end cover at both ends of the cylinder casing is provided with a refrigerant circulation pipe and a drying filter, and the refrigerant passes through the refrigerant circulation. When the pipe enters and exits the cylinder, it is processed by the drying filter, and the piston can move in the cylinder. It moves from the high pressure end to the low pressure end, thereby forming a space for storing high-pressure liquid refrigerant in the cylinder, and a part of the high-pressure liquid refrigerant flows to the expansion throttle. The excess portion is stored therein, and the cylinder type reservoir is connected to the refrigerant circulation pipe between the condenser of the refrigeration system and the evaporator, and is connected to the expansion throttle to ensure circulation and throttling of the refrigerant. The heat recovery air conditioning unit is composed of a blower box, a blower box, a refrigeration system, and a power distribution control system, and one of the refrigeration systems has a diaphragm type liquid storage device capable of storing liquid refrigerant, which is characterized by a diaphragm type The liquid storage device is mainly composed of a tank body, a diaphragm, a drying filter and a refrigerant circulation pipe. The diaphragm is made of elastic or flexible material, which is located in the center of the tank body, and is divided into two independent spaces on the left and right sides, and is connected at the lower part of the tank body. There is a refrigerant circulation pipe and a drying filter. When the refrigerant enters and exits the tank through the refrigerant circulation pipe, it is processed through a drying filter, and the refrigerant circulation pipe is connected with the space on both sides of the tank diaphragm, when the refrigerant circulation pipe is When the high pressure end is connected to the side and the low pressure end is connected to the other side, the diaphragm extends or expands from the high pressure side to the low pressure side, and a large space for storing the high pressure liquid refrigerant is formed on the high pressure side, and a part of the high pressure liquid refrigerant flows to the expansion throttle. The excess portion is stored therein, and the diaphragm type reservoir is connected between the condenser of the refrigeration system and the evaporator, and is connected to the expansion restrictor to ensure the circulation of the refrigerant and Flow. The heat recovery air conditioning unit is composed of a blower box, a ventilating box, a refrigeration system, and a power distribution control system, and one of the refrigeration systems has a gravity flow accumulator that can store liquid refrigerant, and is characterized in that it passes Two refrigerant pipes are connected across and above the expansion restrictor, and are located below the condenser and the evaporator, and have a device for preventing liquid refrigerant from flashing and extracting flash steam, liquid The refrigerant enters and exits the accumulator by its own gravity.

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