High-efficiency energy-saving miniaturized scroll water chiller

Abstract

The utility model relates to a kind of high-efficiency energy-saving miniaturization scroll water chiller, including two or more than above parallel compression refrigeration circuit, and the exhaust of scroll compressor in compression refrigeration circuit is sequentially connected to evaporator via water-cooled condenser, drying filter, thermal expansion valve, evaporator is sequentially connected back gas scroll compressor via redundancy temperature switch, fine filter and / or liquid accumulator, the thermal expansion valve has two temperature sensing bag, two temperature sensing bag are respectively arranged in front and back of redundancy temperature switch, fine filter and / or liquid accumulator;Redundancy temperature switch, thermal expansion valve, scroll compressor are all connected control box. Using double temperature sensing bag accurate monitoring, filtering separation impurity liquid triple protection mechanism can more quickly respond to abnormal working condition caused by offshore high temperature and high humidity, pitching, unit failure rate is effectively reduced compared with traditional unit, significantly improve the reliability of water chiller during ship operation, reduce the influence of key areas, such as ship bridge, guest room, on cooling due to failure downtime.

Description

Technical Field

[0001] This utility model relates to a chiller unit, specifically a high-efficiency, energy-saving, miniaturized scroll chiller unit. Background Technology

[0002] In the marine industry, traditional scroll chiller units have three major pain points: First, they mostly use a single compression refrigeration loop, which cannot be adjusted according to the different cooling needs of the ship during the day and night and in different areas. They need to run at full load continuously, resulting in high energy consumption. A single loop failure will cause the entire ship to stop cooling, affecting operations. Second, the thermal expansion valve is equipped with only a single temperature sensing bulb. The ship's rolling motion can easily cause temperature monitoring errors. Moreover, there are no co-filters and gas-liquid separation components near the temperature sensing bulb. They rely solely on independent pressure and temperature switches for compressor exhaust and return gas ports for protection. On the one hand, evaporator debris and refrigerant oil impurities carried in the return gas can easily enter the compressor, causing wear on the scroll plate and damage to the valve plate. On the other hand, the direct return of incompletely vaporized liquid refrigerant frequently causes compressor liquid slugging problems. Especially under the high temperature and humidity and rolling conditions at sea, the unit failure rate remains high. Third, multi-loop units use a decentralized piping design. The cooling water and refrigerant water pipes for each loop are independent. The piping is messy and the overall volume is large, making it difficult to adapt to the narrow space of the ship. Later maintenance requires checking the piping one by one, which is inefficient. Summary of the Invention

[0003] This invention addresses the shortcomings of traditional chiller units for shipboard water chillers by providing a simple, compact, efficient, energy-saving, miniaturized scroll chiller unit that can adapt to load and operate stably.

[0004] The technical solution adopted in this utility model is: a high-efficiency, energy-saving, miniaturized scroll chiller unit, comprising two or more parallel compression refrigeration circuits, characterized in that: the compression refrigeration circuit includes a scroll compressor, a water-cooled condenser, a dryer filter, a thermostatic expansion valve, and an evaporator; the exhaust gas from the scroll compressor passes sequentially through the water-cooled condenser, the dryer filter, and the thermostatic expansion valve to the evaporator; the evaporator returns gas to the scroll compressor after passing sequentially through a redundant temperature switch, a fine filter, and / or a liquid receiver; the thermostatic expansion valve has two temperature sensors, which are respectively located before and after the redundant temperature switch, the fine filter, and / or the liquid receiver; the redundant temperature switch, the thermostatic expansion valve, and the scroll compressor are all connected to a control box.

[0005] The water-cooled condensers of the two or more compression refrigeration circuits are connected to a common cooling water outlet pipe and a cooling water inlet pipe.

[0006] The evaporators of the two or more compression refrigeration circuits are connected to a common chilled water outlet pipe and a chilled water inlet pipe.

[0007] The water-cooled condenser is a shell-and-tube type water-cooled condenser.

[0008] The two or more compression refrigeration circuits are mounted on the frame, and the two or more evaporators are connected to a combined refrigerant water outlet pipe and refrigerant water inlet pipe from the same side of the frame, and the two or more water-cooled condensers are connected to a combined cooling water outlet pipe and cooling water inlet pipe from the same side of the frame.

[0009] The scroll compressors with two or more compression refrigeration circuits are installed on one side of the upper and lower layers of the frame, and the water-cooled condensers with two or more compression refrigeration circuits are installed on the other side of the upper and lower layers of the frame.

[0010] The scroll compressor is equipped with a high-pressure switch at the exhaust port and a low-pressure switch at the return port. The high and low pressure switches are connected to the control box.

[0011] The beneficial effects of this invention are: 1. Strong load adaptability and significant energy-saving effect: Compared with traditional single-loop marine chiller units, the multi-loop parallel design can flexibly adjust the number of operating loops according to the differentiated cooling needs of different areas such as the bridge, cabins, and engine room control room. It can choose to operate as a single unit, multiple units, or at full load, without continuously consuming energy at full load, significantly reducing energy consumption and lessening the burden on ship fuel-powered electricity generation. Overall energy consumption is effectively lower than traditional units. Furthermore, if a single loop fails, other loops can operate normally, ensuring the continuity of ship cooling and completely solving the problem of ship-wide cooling shutdown due to the failure of traditional single-loop units.

[0012] 2. High operational stability and adaptability to complex shipboard conditions: Dual temperature sensors, combined with redundant temperature switches, fine filters, and / or gas-liquid separators, form a collaborative monitoring, filtration / separation protection system. On one hand, the first temperature sensor monitors the evaporator outlet temperature; the second temperature sensor, installed after the fine filter and gas-liquid separator, accurately captures the true temperature of the refrigerant after filtration and gas-liquid separation. This avoids temperature fluctuations caused by liquid droplets at the evaporator outlet and allows for assessment of filtration and separation effectiveness based on the temperature difference between the first and second sensors. This completely solves the temperature monitoring deviation problem of traditional single temperature sensors under shipboard turbulence, providing protection against thermal expansion. The expansion valve provides precise superheat data. Meanwhile, the fine filter intercepts evaporator debris, sludge, and other impurities, while the gas-liquid separator separates incompletely vaporized liquid refrigerant. This reduces the risk of impurities scratching the scroll plate and liquid refrigerant causing liquid slugging in the compressor. A subsequent temperature sensor monitors temperature changes in real time after filtration and separation: if the fine filter becomes clogged, increasing flow resistance, the sensor will detect an abnormal temperature drop; if the gas-liquid separator fails, the sensor will detect an abnormal temperature rise. Both abnormal signals are simultaneously transmitted to the control box, triggering a fault warning and adjusting the unit's operating status accordingly. This dual-sensor precise monitoring, filtration and separation of impurities, and triple protection mechanism enable faster response to abnormal operating conditions caused by high temperature and humidity at sea and turbulence. The unit failure rate is significantly lower than traditional units, greatly improving the reliability of chiller units during ship operation and reducing the impact of shutdowns on cooling in critical areas such as the bridge and cabins.

[0013] 3. Compact structure and convenient maintenance: Multiple compression refrigeration circuits are integrated into the same frame. The scroll compressor and water-cooled condenser are arranged on the same side of the same layer. The evaporator and condenser are connected to the combined chilled water and cooling water pipes from the same side of the frame, avoiding the messy problem of traditional decentralized piping, greatly reducing the overall size of the unit, and adapting to the narrow equipment compartment space of ships. Attached Figure Description

[0014] Figure 1 This is the electrical schematic diagram of this utility model; Figure 2 This is a diagram of the installation structure of this utility model; Figure 3 for Figure 2 The left view.

[0015] In the diagram: 1. Scroll compressor; 2. Coaxial water-cooled condenser; 3. Dryer filter; 4. Thermal expansion valve; 5. First temperature sensor; 6. Second temperature sensor; 7. Evaporator; 8. Redundant temperature switch; 9. Fine filter; 10. Gas-liquid separator; 11. Control box; 12. Frame; 13. Cooling water outlet pipe; 14. Cooling water inlet pipe; 15. Refrigerant water outlet pipe; 16. Refrigerant water inlet pipe. Detailed Implementation

[0016] The following explanation, in conjunction with the accompanying drawings, will provide further details.

[0017] Figure 1 As shown: A high-efficiency, energy-saving, miniaturized scroll chiller unit includes two or more parallel compression refrigeration circuits. Each compression refrigeration circuit includes a scroll compressor 1, a coaxial water-cooled condenser 2, a dryer filter 3, a thermostatic expansion valve 4, an evaporator 5, a redundant temperature switch 6, a fine filter 7, and a gas-liquid separator 8. The exhaust gas from the scroll compressor 1 passes sequentially through the coaxial water-cooled condenser 2, the dryer filter 3, and the thermostatic expansion valve 4 to the evaporator 5. The evaporator 5 returns gas to the scroll compressor 1 sequentially through the redundant temperature switch 6, the fine filter 7, and the gas-liquid separator 8. The thermostatic expansion valve 4 has a first and a second temperature sensor 41 and 42, which are respectively located before the redundant temperature switch 6 and after the gas-liquid separator 8. The redundant temperature switch, the thermostatic expansion valve, and the scroll compressor are all connected to a control box.

[0018] Figure 2 As shown: The overall structure of the unit includes a frame 10. Two or more compression refrigeration circuits are installed on the upper and lower layers of the frame. Scroll compressors 1 with two or more compression refrigeration circuits are installed on one side of the upper and lower layers of the frame 10, respectively. Co-type water-cooled condensers 2 with two or more compression refrigeration circuits are installed on the other side of the upper and lower layers of the frame 10, respectively. Two or more evaporators are connected to a combined refrigerant water outlet pipe 13 and a refrigerant water inlet pipe 14 from the same side of the frame. Two or more co-type water-cooled condensers 2 are connected to a combined cooling water outlet pipe 11 and a cooling water inlet pipe 12 from the same side of the frame. An evaporator 5 is also installed on the side of the scroll compressor 1 on the frame 10.

[0019] In this embodiment, pressure sensors and temperature sensors may also be installed at the compressor's exhaust and return ports and connected to the control box. This technology is existing technology.

Claims

1. A high-efficiency, energy-saving, miniaturized scroll chiller unit, comprising two or more parallel compression refrigeration circuits, characterized in that: The compression refrigeration circuit includes a scroll compressor, a water-cooled condenser, a dryer filter, a thermostatic expansion valve, and an evaporator. The exhaust gas from the scroll compressor passes sequentially through the water-cooled condenser, the dryer filter, and the thermostatic expansion valve to the evaporator. The evaporator then returns to the scroll compressor after passing sequentially through a redundant temperature switch, a fine filter, and / or a liquid receiver. The thermostatic expansion valve has two temperature sensors, which are respectively located before and after the redundant temperature switch, the fine filter, and / or the liquid receiver. The redundant temperature switch, the thermostatic expansion valve, and the scroll compressor are all connected to a control box.

2. The high-efficiency, energy-saving, miniaturized scroll chiller unit according to claim 1, characterized in that: The water-cooled condensers of the two or more compression refrigeration circuits are connected to a common cooling water outlet pipe and a cooling water inlet pipe.

3. The high-efficiency, energy-saving, miniaturized scroll chiller unit according to claim 1, characterized in that: The evaporators of the two or more compression refrigeration circuits are connected to a common chilled water outlet pipe and a chilled water inlet pipe.

4. A high-efficiency, energy-saving, miniaturized scroll chiller unit according to claim 1 or 2, characterized in that: The water-cooled condenser is a shell-and-tube type water-cooled condenser.

5. The high-efficiency, energy-saving, miniaturized scroll chiller unit according to claim 1, characterized in that: The two or more compression refrigeration circuits are mounted on the frame, and the two or more evaporators are connected to a combined refrigerant water outlet pipe and refrigerant water inlet pipe from the same side of the frame, and the two or more water-cooled condensers are connected to a combined cooling water outlet pipe and cooling water inlet pipe from the same side of the frame.

6. The high-efficiency, energy-saving, miniaturized scroll chiller unit according to claim 5, characterized in that: The scroll compressors with two or more compression refrigeration circuits are installed on one side of the upper and lower layers of the frame, and the water-cooled condensers with two or more compression refrigeration circuits are installed on the other side of the upper and lower layers of the frame.

7. The high-efficiency, energy-saving, miniaturized scroll chiller unit according to claim 1, characterized in that: The scroll compressor is equipped with a high-pressure switch at the exhaust port and a low-pressure switch at the return port. The high and low pressure switches are connected to the control box.

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