CN213066611U

CN213066611U - Magnetic suspension centrifugal unit and air conditioner

Info

Publication number: CN213066611U
Application number: CN202021211332.1U
Authority: CN
Inventors: 梁相之; 何林; 黄童毅; 罗建飞; 李明; 刘廷亮; 彭金成
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-05-12
Filing date: 2020-06-24
Publication date: 2021-04-27
Anticipated expiration: 2030-06-24

Abstract

The utility model discloses a magnetic suspension centrifugal unit and air conditioner, its circulation main line including intercommunication magnetic suspension centrifugal compressor, condenser, evaporimeter be equipped with between magnetic suspension centrifugal compressor's the gas vent and the air inlet and inhale the exhaust bypass pipeline the condenser with still be equipped with the hot gas bypass pipeline that shunts the high-temperature gas who gets into the condenser to the evaporimeter between the evaporimeter, inhale the exhaust bypass pipeline and/or hot gas bypass pipeline is equipped with and falls the structure of making an uproar. The utility model discloses be equipped with at suction exhaust bypass pipeline and/or steam bypass pipeline and fall the structure of making an uproar, can reduce the noise of magnetic suspension centrifuge set when shutting down and/or start.

Description

Magnetic suspension centrifugal unit and air conditioner

Technical Field

The utility model relates to a compressor technical field, concretely relates to magnetic suspension centrifugal unit and air conditioner.

Background

The magnetic suspension centrifugal compressor eliminates the original oil circuit lubrication system, adopts electromagnetic force to suspend the rotor for friction-free rotation, and reduces energy consumption and noise caused by friction. Since an oil supply system is not required and the cost can be reduced, the magnetic levitation centrifugal compressor is widely used in various places such as an air conditioning system. When the magnetic suspension centrifugal compressor is applied to an air conditioning system, the core technology of the magnetic suspension centrifugal compressor is to control the floating of a rotor and adapt to the reliability of the rotor under various working conditions. In an air conditioning system, in order to ensure that the system always moves under a given return air pressure state, a hot gas bypass pipeline is usually arranged to bypass a high-temperature gaseous refrigerant at a high-pressure end to a low-pressure end of the system, and usually the high-temperature high-pressure gas inlet end of a condenser is bypassed to an inlet of an evaporator; in addition, in order to prevent the magnetic suspension centrifugal compressor from generating exhaust backflow to impact the suspended rotor at the closing moment of the check valve when the exhaust pressure is gradually reduced during shutdown, an exhaust and intake bypass pipeline is additionally arranged on the air suction side and the air exhaust side of the compressor. Both the exhaust and intake bypass line and the hot gas bypass line are prone to produce whistling noise.

SUMMERY OF THE UTILITY MODEL

The defect of noise appears easily when the machine is started or is shut down to current air conditioning system's magnetic suspension centrifugal unit, the utility model provides a magnetic suspension centrifugal unit has adopted the structure of making an uproar of falling, the production that can the noise reduction.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a magnetic suspension centrifugal unit, its includes the circulation main line of intercommunication magnetic suspension centrifugal compressor, condenser, evaporimeter be equipped with between magnetic suspension centrifugal compressor's the gas vent and the air inlet and inhale the exhaust bypass pipeline the condenser with still be equipped with the hot gas bypass pipeline that shunts the high-temperature gas who gets into the condenser to the evaporimeter between the evaporimeter, inhale the exhaust bypass pipeline and/or hot gas bypass pipeline is equipped with the structure of making an uproar of falling.

Through more repeated use, the magnetic suspension centrifugal unit often produces noise when shutting down. The utility model discloses the people discovers through the research, and the noise that produces when shutting down is because magnetic suspension centrifugal compressor unit during stop work magnetic suspension centrifugal compressor's shutdown in-process, its inside impeller rotational speed can reduce gradually, this moment magnetic suspension centrifugal compressor's exhaust pressure is also following and is reducing gradually, reduces to certain extent when the exhaust pressure, magnetic suspension centrifugal compressor inspiratory refrigerant by inhale the exhaust bypass pipe and balance, the refrigerant enters into the noise that has produced in the twinkling of an eye of inhaling exhaust bypass pipeline by the circulation main line of magnetic suspension centrifugal compressor's gas vent, consequently inhale exhaust bypass pipeline and be equipped with and fall the structure of making an uproar, can effectively reduce the noise.

When the magnetic suspension centrifugal compressor is started, the hot gas bypass pipeline which plays a role in anti-surge control can generate noise, so that the noise reduction structure is arranged on the hot gas bypass pipeline, and the noise can be effectively reduced.

Furthermore, the noise reduction structure is arranged at the air inlet of the air suction and exhaust bypass pipeline and/or the air outlet of the air suction and exhaust bypass pipeline.

Furthermore, the air inlet of the hot gas bypass pipeline and/or the air outlet of the hot gas bypass pipeline are/is provided with the noise reduction structure

Furthermore, the noise reduction structure comprises a flow guide pipe, the flow guide pipe is provided with a main pipeline connecting port and a bypass pipeline connecting port, and the pipe diameter of the flow guide pipe is gradually reduced from the main pipeline connecting port to the bypass pipeline connecting port.

Furthermore, the main pipeline connecting port is connected with the circulation main pipeline, and the bypass pipeline connecting port is connected with the exhaust bypass pipeline or the hot gas bypass pipeline.

Furthermore, the suction and exhaust bypass pipeline is provided with a first electromagnetic valve, and the hot gas bypass pipeline is provided with a second electromagnetic valve.

Furthermore, a one-way check valve is arranged on a pipe section of the circulation main pipeline, which is communicated with the exhaust port of the magnetic suspension centrifugal compressor and the air inlet of the condenser, and the air inlet of the air suction and exhaust bypass pipeline is arranged on the pipe section between the exhaust port of the magnetic suspension centrifugal compressor and the one-way check valve.

Further, the diameter of the pipeline of the suction and exhaust bypass pipeline and the diameter of the pipeline of the hot gas bypass pipeline are both smaller than the diameter of the pipeline of the circulation main pipeline.

The utility model also provides an air conditioner, its start controlling means who includes foretell magnetic suspension centrifuge group.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model is provided with the noise reduction structure on the air suction and exhaust bypass pipeline and/or the hot air bypass pipeline, which can reduce the noise of the magnetic suspension centrifugal unit during shutdown and/or startup; the machine set can be started in a balanced mode, and noise can be reduced.

Drawings

Fig. 1 is a schematic structural diagram of a magnetic suspension centrifugal unit according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive step are within the scope of the present invention.

Referring to fig. 1, a magnetic suspension centrifugal unit includes a magnetic suspension centrifugal compressor 10, a condenser 20, and an evaporator 30, the magnetic suspension centrifugal compressor 10, the condenser 20, and the evaporator 30 are communicated through a main circulation pipeline 40, and a refrigerant circulates among the centrifugal compressor 10, the condenser 20, and the evaporator 30 through the main circulation pipeline. The main circulation pipeline 40 is provided with a one-way check valve 41 on a pipeline between the exhaust port of the magnetically levitated centrifugal compressor 10 and the intake port of the condenser 20. During shutdown of the magnetic suspension centrifugal compressor 10, the rotation speed of the impeller is reduced, the exhaust pressure is gradually reduced, and when the exhaust pressure is reduced to a certain degree, high-pressure gas in the condenser 20 flows back into the magnetic suspension centrifugal compressor 10 due to pressure difference in the main circulation pipeline 40, and impacts a rotor to cause faults such as shaft collision of the rotor during shutdown. Therefore, a one-way check valve 41 is added to a pipeline section from the exhaust port of the magnetic suspension centrifugal compressor 10 of the circulation main pipeline 40 to the air inlet port of the condenser 20, so as to prevent the backflow impact of the high-pressure gaseous refrigerant in the condenser 20. While the one-way check valve 41 prevents backflow impact, when the discharge pressure is gradually less than the minimum opening pressure, the check valve closes to cause backflow of the discharge gas to impact the suspended rotor. Therefore, a suction and exhaust bypass pipeline 50 is added on the suction side and the exhaust side (the front end of the one-way check valve 41) of the magnetic suspension centrifugal compressor 10 to solve the problem that the exhaust pressure is not enough to support the check valve when the one-way check valve 41 is closed, and the backflow impacts the rotor.

The exhaust and suction bypass pipeline 50 is provided with a first electromagnetic valve 51 for opening the exhaust and suction bypass pipeline 50 when the engine is stopped. However, during use, every time the first electromagnetic valve 51 is opened, a loud noise may occur in the process of the suction/exhaust bypass line 50 balancing the returned exhaust gas pressure. It is found that the noise is generated because the diameter of the main circulation pipeline 40 is large, and the diameter of the bypass suction and exhaust pipeline 50 is small, so that the cross-sectional area of the gas suddenly enters the small pipeline from the large pipeline, the flow velocity is relatively large, and the noise similar to a whistle is generated. Therefore, a noise reduction structure 52 is added to the intake/exhaust bypass line 50. The noise reduction structure 52 includes a flow guide tube having a main pipe connection port 52a and a bypass pipe connection port 52b, and the diameter of the flow guide tube is gradually reduced from the main pipe connection port 52a to the bypass pipe connection port 52 b. In order to further improve the noise reduction effect, the noise reduction structure is arranged at the air inlet of the air intake and exhaust bypass pipeline 50 and the air outlet of the air intake and exhaust bypass pipeline 50.

Further, a hot gas bypass line 60 for bypassing the high-temperature gas entering the condenser 20 to the evaporator 30 is provided between the condenser 20 and the evaporator 30. The hot gas bypass line 60 is provided with a second solenoid valve 61 for opening or closing the hot gas bypass line 60. The hot gas bypass line 60 can play a role in preventing surge of the magnetic levitation centrifugal compressor 10. When a plurality of magnetic suspension centrifugal units are connected in parallel to share a water system, only a small number of units can be used when the user load is relatively low, and the rest units are in a standby state. When the load of a user is increased, the standby unit is started, but the standby unit is started at the water temperature with large temperature difference, namely, the temperature difference between the cooling water temperature of the cooling water exchanging heat with the refrigerant at the condenser and the freezing water temperature of the freezing water exchanging heat with the refrigerant at the evaporator is larger. Therefore, the second electromagnetic valve 61 is opened during starting, so that the phenomenon that the impact on the bearing of the magnetic suspension centrifugal compressor 10 during starting is too large due to too large temperature difference, and the bearing displacement fault is caused is prevented. Similarly, when the diameter of the main circulation line 40 is larger and the diameter of the hot gas bypass line 60 is smaller, the gas suddenly enters the small line from the large line, the cross-sectional area is reduced, the flow rate is relatively increased, and thus, noise like whistle noise occurs. Therefore, a noise reduction structure 62 is added to the hot gas bypass line 60. Specifically, the noise reduction structure 62 includes a flow guide tube having a main pipeline connection port 62a and a bypass pipeline connection port 62b, and the diameter of the flow guide tube is gradually reduced from the main pipeline connection port 62a to the bypass pipeline connection port 62 b. In order to further improve the noise reduction effect, the air inlet of the hot gas bypass pipeline 60 and the air outlet of the hot gas bypass pipeline 60 are provided with the noise reduction structure.

Example 2

An air conditioner comprising the magnetic levitation centrifugal machine set as described in embodiment 1.

The above description is a preferred embodiment of the present invention, but the present invention should not be limited to the disclosure of the embodiment and the accompanying drawings, and therefore, all equivalents and modifications that can be accomplished without departing from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A magnetic suspension centrifugal unit is characterized in that: including the circulation main line of intercommunication magnetic suspension centrifugal compressor, condenser, evaporimeter be equipped with between magnetic suspension centrifugal compressor's the gas vent and the air inlet and inhale the exhaust bypass line the condenser with still be equipped with the hot gas bypass line that shunts the high-temperature gas who gets into the condenser to the evaporimeter between the evaporimeter, inhale exhaust bypass line and/or hot gas bypass line is equipped with and falls the structure of making an uproar.

2. The magnetic levitation centrifuge assembly of claim 1, wherein: the noise reduction structure is arranged at the air inlet of the air suction and exhaust bypass pipeline and/or the air outlet of the air suction and exhaust bypass pipeline.

3. The magnetic levitation centrifuge assembly of claim 1, wherein: the air inlet of the hot gas bypass pipeline and/or the air outlet of the hot gas bypass pipeline are/is provided with the noise reduction structure.

4. The magnetic levitation centrifuge assembly of claim 1, wherein: the noise reduction structure comprises a flow guide pipe, the flow guide pipe is provided with a main pipeline connecting port and a bypass pipeline connecting port, and the pipe diameter of the flow guide pipe is gradually reduced from the main pipeline connecting port to the bypass pipeline connecting port.

5. The magnetic levitation centrifuge set of claim 4, wherein: the main pipeline connecting port is connected with the circulating main pipeline, and the bypass pipeline connecting port is connected with the exhaust bypass pipeline or the hot gas bypass pipeline.

6. The magnetic levitation centrifuge assembly of claim 1, wherein: the suction and exhaust bypass pipeline is provided with a first electromagnetic valve, and the hot gas bypass pipeline is provided with a second electromagnetic valve.

7. The magnetic levitation centrifuge assembly of claim 1, wherein: the circulating main pipeline is provided with a one-way check valve in a pipe section which communicates the exhaust port of the magnetic suspension centrifugal compressor with the air inlet of the condenser, and the air inlet of the air suction and exhaust bypass pipeline is provided with a pipe section between the exhaust port of the magnetic suspension centrifugal compressor and the one-way check valve.

8. The magnetic levitation centrifuge assembly of claim 1, wherein: the diameter of the pipeline of the suction and exhaust bypass pipeline and the diameter of the pipeline of the hot gas bypass pipeline are both smaller than the diameter of the pipeline of the circulation main pipeline.

9. An air conditioner, characterized in that: comprising a magnetic levitation centrifugal machine assembly as claimed in any one of claims 1 to 8.