CN209386597U - A magnetic levitation multi-connected air conditioner unit - Google Patents

Abstract

The utility model relates to a kind of magnetic suspension VRF Air Conditioning Systems, including outdoor unit and indoor units；Outdoor unit includes magnetic suspension centrifugal compressor, air-cooled condenser, liquid storage device, vapour liquid separator；Indoor units include more indoor units；Indoor unit includes electric expansion valve, wind-cooled evaporator；The air exit of magnetic suspension centrifugal compressor is communicated by exhaust pipe with the cooling entrance of air-cooled condenser, the coolant outlet of air-cooled condenser is communicated by pipeline with the entrance of liquid storage device, liquid storage device is equipped with liquid return hole and liquor charging mouth, the liquid return hole of liquid storage device is communicated by liquid back pipe with the cooling vent of magnetic suspension centrifugal compressor, the liquor charging mouth of liquid storage device is communicated by liquid pushing tube with the entrance of electric expansion valve, the outlet of electric expansion valve is communicated by pipeline with the entrance of wind-cooled evaporator, the outlet of wind-cooled evaporator is communicated by steam pipe with the entrance of vapour liquid separator, the gas returning port of vapour liquid separator is communicated by muffler with the air entry of magnetic suspension centrifugal compressor.

Description

A magnetic levitation multi-connected air conditioner unit

technical field

The utility model relates to the technical field of multi-connected air-conditioning units, in particular to a magnetic levitation multi-connected air-conditioning unit.

Background technique

Existing multi-connected air-conditioning units are mainly composed of variable frequency scroll compressors, oil separators, air-cooled condensers, axial flow fans, liquid receivers, and multiple indoor units. The indoor units contain evaporators, electronic expansion valves , blower, etc. Its working principle is: high-pressure and high-temperature gas refrigerant is discharged from the exhaust port of the compressor, and part of the lubricating oil will be carried in the discharged refrigerant, and the refrigerant mixed with lubricating oil will be exhausted into the oil separator. Most of the lubricating oil is separated, and returns to the suction port of the compressor through the oil return line, and then flows back to the compressor; a small part of the lubricating oil will flow into the condenser with the refrigerant gas, and the refrigerant will cool and condense in the air-cooled condenser High-pressure and high-temperature liquid refrigerant, the air circulates through the axial flow fan, and the air absorbs the condensation heat of the refrigerant; the liquid refrigerant mixed with a small part of lubricating oil enters the liquid receiver; the liquid refrigerant mixed with a small part of lubricating oil passes through the liquid The pipeline is distributed to multiple indoor units; after entering the indoor unit, it is throttled by the electronic expansion valve to form a low-temperature and low-pressure gas-liquid two-phase mixture; then the refrigerant mixed with a small amount of lubricating oil enters the evaporator, and the low-pressure and low-temperature liquid refrigerant Absorbing the heat of the indoor air, the refrigerant evaporates into a gas, and the indoor temperature drops; the low-pressure and low-temperature refrigerant gas returns to the suction port of the compressor along with the gas pipeline, and a small part of the lubricating oil is driven by the return air flow rate, and the The air pipe wall flows back to the compressor. However, when only some indoor units are running, the flow rate of the return air main pipe is too low to bring the lubricating oil back to the suction port of the compressor; A small portion of lubricating oil in the evaporator is carried back to the compressor.

Therefore, when the existing multi-connected air-conditioning unit compressor adopts lubricating oil, the lubricating oil will bring the following disadvantages: (1) the lubricating oil will enter the heat exchanger with the refrigerant, affecting the heat exchange of the heat exchanger efficiency; (2) In order to have sufficient lubricating oil in the compressor, the lubricating oil in the refrigeration system must be brought back to the compressor, which requires a complex oil return system; (3) When the multi-connected air conditioner unit is operating at part load, Only some of the indoor units are turned on, and the flow rate of the total air return pipe is too low to bring the lubricating oil in the evaporator back to the compressor. It is necessary to turn on all the indoor units at regular intervals to run the oil return cycle, resulting in unnecessary energy consumption; (4) In order to ensure the return of oil, the return air pipe needs to have sufficient refrigerant flow rate, and the diameter of the return air pipe must be limited, which will cause the resistance of the return air pipe to be too large and reduce the energy efficiency ratio of the unit. The technical problem to be solved by the invention is that the oil return system of the unit caused by lubricating oil is complicated, and the energy efficiency of the unit is low.

Utility model content

Aiming at the technical problems existing in the prior art, the purpose of this utility model is: to provide a magnetic levitation multi-connected air conditioner unit, which does not require lubricating oil, and does not need a specially designed oil return pipeline for the air conditioner unit. The unit is simple and reliable.

In order to achieve the above object, the utility model adopts the following technical solutions:

A magnetic suspension multi-connected air conditioner unit, including an outdoor unit and an indoor unit; the outdoor unit includes a magnetic suspension centrifugal compressor, an air-cooled condenser, a liquid storage device, and a vapor-liquid separator; the indoor unit includes multiple indoor units; the indoor unit includes Electronic expansion valve, air-cooled evaporator;

The exhaust outlet of the magnetic levitation centrifugal compressor communicates with the cooling inlet of the air-cooled condenser through the exhaust pipe, and the cooling outlet of the air-cooled condenser communicates with the inlet of the liquid receiver through a pipe. The liquid port, the liquid return port of the liquid receiver communicates with the cooling port of the magnetic levitation centrifugal compressor through the liquid return pipe, the liquid delivery port of the liquid receiver communicates with the inlet of the electronic expansion valve through the liquid delivery pipe, and the outlet of the electronic expansion valve passes through The pipeline communicates with the inlet of the air-cooled evaporator, the outlet of the air-cooled evaporator communicates with the inlet of the gas-liquid separator through the steam pipe, and the air return port of the gas-liquid separator communicates with the suction port of the magnetic levitation centrifugal compressor through the gas return pipe. The magnetic levitation multi-connected air conditioner unit uses a frequency conversion oil-free magnetic levitation centrifugal compressor, which avoids the problems of complex structure and low energy efficiency of the air conditioner unit caused by lubricating oil.

Further, the exhaust pipe is provided with a one-way valve to prevent the compressed gas from flowing back to the exhaust outlet in reverse.

Further, the liquid delivery pipe is provided with a fluorine pump, and the fluorine pump assists the liquid delivery pipe to supply liquid to multiple indoor units, which can meet the long-distance and high-drop usage of the indoor and outdoor units.

Further, there are several indoor units, and several indoor units are installed in parallel, the electronic expansion valves of several indoor units are all connected with the liquid delivery pipe, and the air-cooled evaporators of several indoor units are all connected with the steam pipe . Increase the utilization efficiency of the indoor unit.

Further, the cooling port of the magnetic levitation centrifugal compressor is connected with the motor of the magnetic levitation centrifugal compressor through a cooling pipeline, and a solenoid valve is arranged on the cooling pipeline. The solenoid valve is used to control the opening and stopping of the coolant in the cooling pipeline, and the coolant is used to cool the motor of the compressor.

Further, the magnetic levitation multi-connected air conditioner unit also includes an axial flow fan; the axial flow fan is installed on the air-cooled condenser. The axial flow fan is beneficial to the heat dissipation of the air-cooled condenser.

Further, the indoor unit also includes a blower for circulating air, and is used for delivering cold air indoors.

In general, the utility model has the following advantages:

The magnetic levitation multi-connected air conditioner unit has no lubricating oil in the system, no special oil return pipeline and control system, and the air conditioner unit is simple and reliable; since no oil enters the heat exchanger, the heat exchange efficiency is high; at the same time, the air conditioner unit does not need to guarantee Therefore, the steam pipe and return pipe with the largest diameter can be selected to reduce the suction resistance and increase the energy efficiency ratio. Fluorine pumps are used to assist liquid supply to multiple indoor units, which can meet the long-distance and high-drop usage of indoor and outdoor units.

Description of drawings

Figure 1 is a block diagram of the structure of the magnetic levitation multi-connected air conditioner unit.

Fig. 2 is a schematic diagram of connection of various structures of the magnetic levitation multi-connected air conditioner unit.

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

In order to facilitate a unified review of the various reference signs in the drawings of the specification, the unified description of the reference signs appearing in the drawings of the specification is as follows:

1 is magnetic levitation centrifugal compressor, 2 is air-cooled condenser, 3 is liquid receiver, 4 is vapor-liquid separator, 5 is indoor unit, 6 is electronic expansion valve, 7 is air-cooled evaporator, 8 is exhaust Outlet, 9 is the exhaust pipe, 10 is the pipeline, 11 is the liquid return pipe, 12 is the liquid delivery pipe, 13 is the steam pipe, 14 is the air return pipe, 15 is the one-way valve, 16 is the fluorine pump, 17 is the axial flow fan , 18 is the blower, 19 is the cooling inlet, 20 is the cooling outlet, 21 is the inlet of the liquid reservoir, 22 is the liquid return port, 23 is the liquid delivery port, 24 is the cooling port, 25 is the inlet of the electronic expansion valve, 26 is The outlet of the electronic expansion valve, 27 is the inlet of the air-cooled evaporator, 28 is the outlet of the air-cooled evaporator, 29 is the inlet of the vapor-liquid separator, 30 is the air return port, and 31 is the suction port.

As shown in Figure 1 and Figure 2, a magnetic levitation multi-connected air conditioner unit includes an outdoor unit and an indoor unit; the outdoor unit includes a magnetic levitation centrifugal compressor, an air-cooled condenser, a liquid storage device, and a vapor-liquid separator; the indoor unit Including multiple indoor units; indoor units include electronic expansion valves, air-cooled evaporators;

The exhaust outlet of the magnetic suspension centrifugal compressor communicates with the cooling inlet of the air-cooled condenser through the exhaust pipe. The magnetic suspension centrifugal compressor compresses the refrigerant gas into a high-temperature and high-pressure refrigerant gas, and then the high-temperature and high-pressure refrigerant gas is discharged The gas is discharged from the outlet, and then flows along the exhaust pipe to the air-cooled condenser. The cooling outlet of the air-cooled condenser communicates with the inlet of the liquid receiver through a pipe. The air-cooled condenser is a heat exchanger, which is a device that can transfer part of the heat of the hot fluid to the cold fluid. The air-cooled condenser The cooling inlet and the cooling outlet are respectively an inlet and an outlet for heat transfer of the refrigerant. The high-temperature and high-pressure refrigerant gas is condensed into high-temperature and high-pressure refrigerant liquid in the air-cooled condenser and stored in the liquid receiver. The liquid receiver is equipped with a liquid return port and a liquid delivery port. The liquid return port of the liquid receiver communicates with the cooling port of the magnetic levitation centrifugal compressor through the liquid return pipe, and a small amount of high-temperature and high-pressure refrigerant liquid passes through the liquid return pipe through the liquid return port. Returning to the cooling port of the magnetic levitation centrifugal compressor, the small amount of high temperature and high pressure refrigerant liquid is used to cool the motor of the magnetic levitation centrifugal compressor; the liquid delivery port of the liquid receiver communicates with the inlet of the electronic expansion valve through the liquid delivery pipe , Most of the high-temperature and high-pressure refrigerant liquid flows from the liquid delivery port to the electronic expansion valve of the indoor unit through the liquid delivery pipe. The outlet of the electronic expansion valve communicates with the inlet of the air-cooled evaporator through a pipe, and the high-temperature and high-pressure refrigerant liquid flows from the electronic expansion valve to the air-cooled evaporator, and the electronic expansion valve plays the role of throttling. After the high-temperature and high-pressure refrigerant liquid is throttled by the electronic expansion valve, it becomes a low-temperature and low-pressure gas-liquid two-phase mixture. The outlet of the air-cooled evaporator communicates with the inlet of the vapor-liquid separator through a steam pipe, and the low-temperature and low-pressure gas-liquid two-phase mixture evaporates under the action of the air-cooled evaporator to become a low-temperature and low-pressure refrigerant vapor, and a low-temperature and low-pressure refrigerant vapor Flow along the steam pipe to the vapor-liquid separator. The air return port of the gas-liquid separator communicates with the suction port of the magnetic levitation centrifugal compressor through the air return pipe. When the indoor unit fails, or the moment the unit is just started, the refrigerant liquid in the indoor unit may not evaporate completely, resulting in liquid in the low-temperature and low-pressure refrigerant vapor. The vapor-liquid separator can separate the low-temperature and low-pressure refrigerant vapor The gas is separated from the liquid, and the separated liquid is stored in the gas-liquid separator. The separated gas flows back to the magnetic levitation centrifugal compressor through the air return port along the air return pipe, and finally the magnetic levitation centrifugal compressor recompresses the gas into high temperature The high-pressure refrigerant gas then continuously circulates the above process again. The magnetic levitation multi-connected air conditioner unit uses a frequency conversion oil-free magnetic levitation centrifugal compressor. Compared with the existing frequency conversion scroll compressor, this magnetic levitation multi-connected air conditioner unit avoids the complex structure and low energy efficiency of the air conditioner unit caused by lubricating oil. question.

There is a one-way valve on the exhaust pipe to prevent the compressed gas from flowing back to the exhaust outlet. The high-temperature and high-pressure refrigerant gas is discharged from the exhaust outlet. After being discharged, it can only flow to the air-cooled condenser along the exhaust pipe. Instead, it cannot reversely flow back from the air-cooled condenser to the exhaust outlet of the magnetic levitation centrifugal compressor.

There is a fluorine pump on the liquid delivery pipe, and the fluorine pump assists the liquid delivery pipe to supply liquid to multiple indoor units, which can meet the long-distance and high-drop usage of indoor units and outdoor units. The control method of the fluorine pump is: when the electronic expansion valve of any indoor unit reaches the maximum opening and the superheat of the return air is greater than 7°C, the fluorine pump is run; otherwise, the fluorine pump is stopped.

There are several indoor units installed in parallel, the electronic expansion valves of several indoor units are all connected with the liquid delivery pipe, and the air-cooled evaporators of several indoor units are all connected with the steam pipe. Each indoor unit is connected between the steam pipe and the liquid delivery pipe. The indoor units are connected in parallel, and the operation of each other does not affect each other. The indoor units can operate independently or any number of indoor units within the design range Run together to increase the efficiency of the indoor unit.

The cooling port of the magnetic levitation centrifugal compressor is connected with the motor of the magnetic levitation centrifugal compressor through a cooling pipeline, and a solenoid valve is arranged on the cooling pipeline. The cooling pipeline is a pipeline system for cooling inside the magnetic levitation centrifugal compressor, which belongs to the prior art, and the cooling pipeline and the motor are not shown in the figure. The solenoid valve is used to control the opening and stopping of the cooling liquid in the cooling pipeline. The cooling liquid is a small amount of liquid flowing back from the liquid reservoir. The cooling liquid is used to cool the motor of the magnetic levitation centrifugal compressor. The cooling liquid flows into the cooling pipeline from the cooling port, and under the control of the solenoid valve, the cooling liquid cools the motor and other components in the magnetic levitation centrifugal compressor.

The magnetic levitation multi-connected air conditioning unit also includes an axial flow fan; the axial flow fan is installed on the air-cooled condenser. The axial flow fan is beneficial to the heat dissipation of the air-cooled condenser. The air-cooled condenser will release heat during the process of condensing the high-temperature and high-pressure refrigerant gas into a high-temperature and high-pressure refrigerant liquid. The axial flow fan will dissipate the heat released in the process. It is beneficial to convert the high-temperature and high-pressure refrigerant gas into high-temperature and high-pressure refrigerant liquid.

The indoor unit also includes a blower for circulating air, which is used for indoor circulation and delivery of cold air to achieve the effect of indoor cooling.

The working principle of the magnetic levitation multi-connected air conditioner unit: high temperature and high pressure refrigerant gas is discharged through the exhaust outlet of the magnetic levitation centrifugal compressor, and after passing through the check valve, it enters the air-cooled condenser from the cooling inlet of the air-cooled condenser. The high-temperature and high-pressure refrigerant gas in the air-cooled condenser is condensed into high-temperature and high-pressure refrigerant liquid. The air-cooled condenser dissipates heat through the axial flow fan, and the high-temperature and high-pressure refrigerant liquid enters the liquid receiver from the inlet of the liquid receiver. After entering the liquid receiver, the high-temperature and high-pressure refrigerant liquid flows out in two ways, one of which returns to the cooling port of the magnetic levitation centrifugal compressor through the liquid return port through the liquid return pipe, and the cooling port passes through the cooling pipeline and the magnetic levitation centrifugal compressor. There is a solenoid valve on the cooling pipeline to control the spray cooling, which is used to cool the motor of the compressor; the other path of the liquid reservoir flows from the liquid delivery port to the indoor unit through the liquid delivery pipe, and the fluorine on the liquid delivery pipe The pump assists in supplying liquid to multiple indoor units, which can meet the long-distance and high-drop usage conditions of indoor and outdoor units, and make up for the defect of low compression ratio of centrifugal compressors. The high-temperature and high-pressure refrigerant liquid flowing into the indoor unit first passes through the electronic expansion valve and then becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant. After absorbing heat, it evaporates into low-temperature and low-pressure refrigerant vapor; the indoor air is circulated by the blower, and the low-temperature and low-pressure refrigerant vapor enters the steam pipe. The low-temperature and low-pressure refrigerant vapor evaporated by multiple indoor units all flows into the steam pipe, and then returns to the vapor-liquid separator. Under the action of the vapor-liquid separator, a small amount of liquid in the low-temperature and low-pressure refrigerant vapor remains in the vapor-liquid separation In the compressor, the gas in the low-temperature and low-pressure refrigerant vapor returns to the suction port of the compressor, and the cycle continues like this.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the above-mentioned embodiment, and any other changes, modifications and substitutions made without departing from the spirit and principle of the present utility model , combination, and simplification, all should be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (7)

1. a kind of magnetic suspension VRF Air Conditioning System, it is characterised in that: including outdoor unit and indoor units；Outdoor unit includes magnetcisuspension Floating centrifugal compressor, air-cooled condenser, liquid storage device, vapour liquid separator；Indoor units include more indoor units；Indoor unit includes Electric expansion valve, wind-cooled evaporator；

The air exit of magnetic suspension centrifugal compressor is communicated by exhaust pipe with the cooling entrance of air-cooled condenser, air-cooled condensation The coolant outlet of device is communicated by pipeline with the entrance of liquid storage device, and liquid storage device is equipped with liquid return hole and liquor charging mouth, and liquid storage device returns liquid Mouth is communicated by liquid back pipe with the cooling vent of magnetic suspension centrifugal compressor, and the liquor charging mouth of liquid storage device is swollen by liquid pushing tube and electronics The entrance of swollen valve communicates, and the outlet of electric expansion valve is communicated by pipeline with the entrance of wind-cooled evaporator, and wind-cooled evaporator goes out Mouth is communicated by steam pipe with the entrance of vapour liquid separator, and the gas returning port of vapour liquid separator passes through muffler and magnetcisuspension floating centrifugal pressure The air entry of contracting machine communicates.

2. a kind of magnetic suspension VRF Air Conditioning System described in accordance with the claim 1, it is characterised in that: exhaust pipe is equipped with unidirectional Valve.

3. a kind of magnetic suspension VRF Air Conditioning System described in accordance with the claim 1, it is characterised in that: liquid pushing tube is equipped with fluorine Pump.

4. a kind of magnetic suspension VRF Air Conditioning System described in accordance with the claim 1, it is characterised in that: indoor unit has several, It is installed in parallel between several indoor units, the electric expansion valve of several indoor units is connected with liquid pushing tube, several interiors The wind-cooled evaporator of machine is connected with steam pipe.

5. a kind of magnetic suspension VRF Air Conditioning System described in accordance with the claim 1, it is characterised in that: magnetic suspension centrifugal compressor The cooling vent of machine is connect by cooling line with the motor of magnetic suspension centrifugal compressor, and cooling tube is equipped with solenoid valve.

6. a kind of magnetic suspension VRF Air Conditioning System described in accordance with the claim 1, it is characterised in that: magnetic suspension multi-connected air conditioner Unit further includes axial flow blower；Axial flow blower is mounted on air-cooled condenser.

7. a kind of magnetic suspension VRF Air Conditioning System described in accordance with the claim 1, it is characterised in that: indoor unit further includes being used for The pressure fan of circulation air.