Marine air-suspended variable frequency centrifugal water chiller

Abstract

This utility model relates to a marine air-suspension variable frequency centrifugal chiller unit. The exhaust port of the dynamic pressure air-suspension centrifugal compressor is connected to a condenser. The condenser outputs two separate lines: one line connects via an electronic expansion valve to the inlet of the motor cooling system of the dynamic pressure air-suspension centrifugal compressor, and the outlet of the motor cooling system connects to the return air port of the dynamic pressure air-suspension centrifugal compressor; the other line splits into two separate inlets, one for a plate heat exchanger and the other for a gas supply. The outlet of the other gas supply line connects via a pressure sensor and a temperature sensor to the gas supply port of the dynamic pressure air-suspension centrifugal compressor. The outlet of the first gas supply line connects via an electronic expansion valve to the first thermal stage of a dry evaporator, and then via a gas-liquid separator to the return air port of the dynamic pressure air-suspension centrifugal compressor. Its structure is simple, capable of adapting to complex load changes on ships, and can provide integrated real-time cooling for the compressor motor, ensuring stable and safe compression and cooling under complex load variations.

Description

Technical Field

[0001] This utility model relates to a chiller unit, specifically a marine air-suspended variable frequency centrifugal chiller unit. Background Technology

[0002] As the shipbuilding industry's demands for refrigeration equipment become increasingly stringent, traditional marine chiller units generally employ centrifugal compressors with mechanical bearings, which suffer from drawbacks such as high frictional losses and low energy efficiency. The lubrication system of mechanical contact bearings is prone to oil film rupture under ship rolling conditions, leading to bearing wear and downtime. Furthermore, under the complex and variable heat load demands of ships, the compressor motor cannot effectively cool its own heat, directly impacting compression and refrigeration efficiency. Summary of the Invention

[0003] This utility model provides a marine air-suspended variable frequency centrifugal chiller unit with a simple structure that can match the complex load changes of ships and integrate real-time cooling of the compressor motor.

[0004] The technical solution adopted in this utility model is: a marine air-suspension variable frequency centrifugal chiller unit, characterized in that: it includes a dynamic pressure air-suspension centrifugal compressor, the exhaust port of the dynamic pressure air-suspension centrifugal compressor is connected to a condenser, the condenser outputs two separate paths, one path is connected to the inlet of the motor cooling system of the dynamic pressure air-suspension centrifugal compressor via an electronic expansion valve, the outlet of the motor cooling system is connected to the return air port of the dynamic pressure air-suspension centrifugal compressor, the other path is divided into two paths, one path is sent to the inlet of a plate heat exchanger and the other path is sent to the inlet of another process, the outlet of the other process is connected to the gas supply port of the dynamic pressure air-suspension centrifugal compressor via a pressure sensor and a temperature sensor, the outlet of the first process is connected to the first thermal stage of a dry evaporator via an electronic expansion valve, and then connected to the return air port of the dynamic pressure air-suspension centrifugal compressor via a gas-liquid separator.

[0005] The other hot section of the dry evaporator is externally connected via flexible joints.

[0006] The exhaust gas from the dynamic pressure air suspension centrifugal compressor is connected to the condenser via a control valve and / or a check valve.

[0007] The condenser outlet is connected in sequence via a ball valve, a dryer filter, and a sight glass before splitting into two paths.

[0008] The outlet of the motor cooling system is connected to the gas-liquid separator.

[0009] The exhaust port of the dynamic pressure air suspension centrifugal compressor is externally connected to an exhaust temperature sensor, an exhaust pressure sensor, and a high-pressure switch, while the return air port of the dynamic pressure air suspension centrifugal compressor is externally connected to a return air temperature sensor, a return air pressure sensor, and a low-pressure switch.

[0010] The condenser is connected to an external safety valve.

[0011] This invention employs a dynamic pressure air-suspension centrifugal compressor, which can meet the high-precision refrigeration requirements of low energy consumption and real-time matching with complex load changes on ships. After combining with the condenser, one path is sent to the compressor motor cooling system. The motor cooling system performs heat exchange and cooling on the compressor motor, and the cooled gas returns to the return port of the dynamic pressure air-suspension centrifugal compressor, meeting the compressor motor cooling requirements in real time and ensuring the safe, stable operation and service life of the compressor under variable frequency conditions. The other path passes through an electronic expansion valve in one of the two processes of plate heat exchanger and exchanges heat with the other path to replenish gas and increase enthalpy for the dynamic pressure air-suspension centrifugal compressor, further improving the thermodynamic efficiency and operational stability of the compressor under complex load changes, and achieving stable system pressure under fluctuating conditions. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the present invention.

[0013] In the diagram: 1. Dynamic pressure air suspension centrifugal compressor; 2. Exhaust control valve; 3. Check valve; 4. Condenser; 5. Ball valve; 6. Dryer filter; 7. Sight glass; 8. Cooling electronic expansion valve; 9. Motor; 10. Motor cooling system; 11. Plate heat exchanger; 12. Make-up air electronic expansion valve; 13. Make-up air port; 14. Evaporator electronic expansion valve; 15. Dry evaporator; 16. Gas-liquid separator; 17. Return gas control valve; 18. Make-up air temperature sensor; 19. Make-up air pressure sensor. Detailed Implementation

[0014] The following explanation, in conjunction with the accompanying drawings, will provide further details.

[0015] Figure 1 As shown, a marine air-suspension variable frequency centrifugal chiller unit includes a dynamic pressure air-suspension centrifugal compressor 1, an exhaust control valve 2, a one-way valve 3, a condenser 4, a ball valve 5, a dryer filter 6, a sight glass 7, a cooling electronic expansion valve 8, a plate heat exchanger 11, a make-up air electronic expansion valve 12, an evaporator electronic expansion valve 14, a dry evaporator 15, a gas-liquid separator 16, and a return gas control valve 17.

[0016] The exhaust port of the dynamic pressure air-suspension centrifugal compressor 1 is connected to the condenser 4 via the exhaust pressure sensor, exhaust temperature sensor, high-pressure switch, exhaust control valve 2, and check valve 3. The condenser 4 outlet is then connected to the condenser 4 via the ball valve 5, dryer filter 6, and sight glass 7, then split into two paths. One path connects to the motor cooling system 10 inlet of the motor 9 of the dynamic pressure air-suspension centrifugal compressor 1 via the cooling electronic expansion valve 8. The outlet of the motor cooling system 10 connects to the return air port of the dynamic pressure air-suspension centrifugal compressor 1. The other path splits into two: one path sends to the inlet of the plate heat exchanger 11, and the other path connects to the inlet of another process via the make-up air electronic expansion valve 12. The outlet of the other process connects to the make-up air port 13 of the dynamic pressure air-suspension centrifugal compressor 1 via the make-up air temperature sensor 18 and make-up air pressure sensor 19. The outlet of the first process connects to the first hot section of the dry evaporator 15 via the evaporator electronic expansion valve 14, then to the return air port of the dynamic pressure air-suspension centrifugal compressor 1 via the gas-liquid separator 16, return air control valve 17, return air pressure sensor, and return air temperature sensor. The outlet 10 of the motor cooling system connects to the gas-liquid separator 16.

[0017] Based on this embodiment, the inlet and outlet of the other hot section of the dry evaporator can also be connected externally via flexible joints. A safety valve can be connected externally to the condenser.

Claims

1. A marine air-suspended variable frequency centrifugal chiller unit, characterized in that: It includes a dynamic pressure air suspension centrifugal compressor. The exhaust port of the dynamic pressure air suspension centrifugal compressor is connected to the condenser. The condenser outputs two separate paths. One path is connected to the inlet of the motor cooling system of the dynamic pressure air suspension centrifugal compressor via an electronic expansion valve. The outlet of the motor cooling system is connected to the return port of the dynamic pressure air suspension centrifugal compressor. The other path is split into two paths, one sending to the inlet of a plate heat exchanger and the other to the inlet of another process. The outlet of the other process is connected to the gas supply port of the dynamic pressure air suspension centrifugal compressor via a pressure sensor and a temperature sensor. The outlet of the first process is connected to the first hot pass of a dry evaporator via an electronic expansion valve, and then to the return port of the dynamic pressure air suspension centrifugal compressor via a gas-liquid separator.

2. A marine air-suspended variable frequency centrifugal chiller unit according to claim 1, characterized in that: The other hot section of the dry evaporator is externally connected via flexible joints.

3. A marine air-suspended variable frequency centrifugal chiller unit according to claim 1, characterized in that: The exhaust gas from the dynamic pressure air suspension centrifugal compressor is connected to the condenser via a control valve and / or a check valve.

4. A marine air-suspended variable frequency centrifugal chiller unit according to claim 1 or 3, characterized in that: The condenser outlet is connected in sequence via a ball valve, a dryer filter, and a sight glass before splitting into two paths.

5. A marine air-suspended variable frequency centrifugal chiller unit according to claim 1, characterized in that: The outlet of the motor cooling system is connected to the gas-liquid separator.

6. A marine air-suspended variable frequency centrifugal chiller unit according to claim 1, characterized in that: The exhaust port of the dynamic pressure air suspension centrifugal compressor is externally connected to an exhaust temperature sensor, an exhaust pressure sensor, and a high-pressure switch, while the return air port of the dynamic pressure air suspension centrifugal compressor is externally connected to a return air temperature sensor, a return air pressure sensor, and a low-pressure switch.

7. A marine air-suspended variable frequency centrifugal chiller unit according to claim 1, characterized in that: The condenser is connected to an external safety valve.

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