A water-cooled screw chiller unit

Abstract

This utility model discloses a water-cooled screw chiller unit, including a unit casing and a unit base. The unit casing houses a screw compressor, a condenser, a throttling device, an evaporator, and a refrigerant circulation pipeline. The screw compressor, condenser, throttling device, and evaporator are sequentially connected through the refrigerant circulation pipeline. The condenser has a spiral guide plate inside, and the evaporator has multiple corrugated heat exchange tubes inside. The two ends of the condenser and evaporator are provided with double sealing rings at the connection points with the refrigerant circulation pipeline. The double sealing rings include an inner fluororubber sealing layer and an outer metal spiral wound gasket sealing layer.

Description

Technical Field

[0001] This utility model belongs to the technical field of water chiller units, and more specifically, it relates to a water-cooled screw water chiller unit. Background Technology

[0002] Water-cooled screw chillers are core equipment that relies on a screw compressor to compress refrigerant and achieve a refrigeration cycle through a condenser (water-cooled), a throttling device, and an evaporator. They are widely used in applications requiring large cooling capacity output. Existing screw chiller technology has the following main problems:

[0003] 1. Low energy efficiency ratio: Traditional units often use fixed flow path design for condensers and evaporators. The heat exchange efficiency of cooling water and refrigerant is limited by uneven flow velocity distribution. Especially under partial load conditions (such as low cooling capacity demand), the compressor still operates in a high energy consumption state, resulting in a decrease in overall energy efficiency.

[0004] 2. Scale buildup in condensers affects heat dissipation: Long-term circulation of cooling water in water-cooled condensers can easily lead to the growth of scale and algae, which, after adhering to the inner wall of the heat exchange tubes, significantly reduce the heat transfer coefficient, requiring frequent shutdowns for cleaning and affecting the stability of continuous operation.

[0005] 3. Inconvenient maintenance: Core components such as screw compressors and heat exchangers are usually integrated in a sealed enclosure. During maintenance, a large number of pipes or the outer casing need to be disassembled, which is time-consuming and labor-intensive. In addition, some units are not equipped with fault warning functions, which can easily lead to shutdown accidents due to minor problems.

[0006] 4. Insufficient noise and vibration control: Screw compressors vibrate significantly during operation. If the vibration damping structure is not designed properly, it will cause the unit noise to exceed the standard (especially when operating at night), affecting the surrounding environment. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a water-cooled screw chiller unit to solve the problems mentioned in the background section.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a water-cooled screw chiller unit, comprising a unit casing and a unit base, characterized in that: the unit casing houses a screw compressor, a condenser, a throttling device, an evaporator, and a refrigerant circulation pipeline; the screw compressor, condenser, throttling device, and evaporator are sequentially connected via the refrigerant circulation pipeline; the condenser contains a spiral guide plate, and the evaporator contains multiple corrugated heat exchange tubes; double sealing rings are provided at the connection points between the condenser and evaporator and the refrigerant circulation pipeline, the double sealing rings comprising an inner fluororubber sealing layer and an outer metal spiral wound gasket sealing layer.

[0009] Preferably, the surface of the unit housing is further provided with an intelligent control component, which includes a control box located on the surface of the unit housing, an integrated temperature sensor, a pressure sensor located inside the unit housing, and a PID controller located inside the control box.

[0010] Preferably, the outer casing of the unit is provided with sound insulation cotton and a damping coating.

[0011] Preferably, the spiral angle of the spiral guide plate is 15° to 45°, the surface corrugation height of the corrugated heat exchange tube is 2mm to 5mm, and the corrugation spacing is 10mm to 20mm.

[0012] Preferably, the bottom of the screw compressor is provided with a composite vibration damping structure, which includes a rubber vibration damping base disposed at the bottom of the screw compressor, a hydraulic damper located between the bottom of the screw compressor and the unit base, and the unit base is disposed at the bottom of the hydraulic damper.

[0013] Preferably, the condenser and evaporator surfaces are provided with pull-out access doors.

[0014] This utility model provides a water-cooled screw chiller unit, which has the following beneficial effects:

[0015] 1. By optimizing the heat exchange structure (spiral flow guide and corrugated tube heat exchange) and intelligent frequency conversion control, the unit's overall energy efficiency is improved by 15% to 30% compared with traditional models, and the energy-saving effect is significant under partial load conditions.

[0016] 2. The dual-seal design reduces the risk of refrigerant / cooling water leakage, extends the service life of the unit, and provides supplementary protection for the reliability of core heat exchange components.

[0017] 3. The composite vibration reduction structure reduces vibration transmission, and the soundproof shell reduces noise radiation, solving the problem of excessive noise and vibration in traditional units. Attached Figure Description

[0018] Figure 1 This is a front structural diagram of the present invention.

[0019] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0020] In the diagram, 1. Unit casing; 2. Unit base; 3. Screw compressor; 4. Condenser; 5. Throttling device; 6. Evaporator; 7. Refrigerant circulation pipeline; 8. Spiral guide plate; 9. Corrugated heat exchange tube; 10. Double sealing ring; 11. Intelligent control components; 1101. Control box; 1102. Integrated temperature sensor; 1103. Pressure sensor; 1104. PID controller; 12. Composite vibration damping structure; 1201. Rubber vibration damping base; 1202. Hydraulic damper; 13. Pull-out maintenance door. Detailed Implementation

[0021] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0022] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Please see Figures 1 to 2 This utility model provides a technical solution: a water-cooled screw chiller unit, including a unit housing 1 and a unit base 2. The unit housing 1 is equipped with a screw compressor 3, a condenser 4, a throttling device 5, an evaporator 6 and a refrigerant circulation pipeline 7. The screw compressor 3, condenser 4, throttling device 5 and evaporator 6 are connected in sequence through the refrigerant circulation pipeline 7 to form a complete refrigeration cycle system.

[0025] The condenser 4 is equipped with a spiral guide plate 8, which changes the direction of cooling water flow to make the water flow in a spiral shape, uniformly distributes the flow velocity and destroys the laminar boundary layer, significantly improving the condensation heat exchange efficiency; the evaporator 6 is equipped with multiple corrugated heat exchange tubes 9, which increase the contact area and disturbance effect between the heat exchange tubes and the refrigerant through the corrugated structure, thereby enhancing the evaporation heat exchange performance.

[0026] Double sealing rings 10 are provided at the connection points between the condenser 4 and the evaporator 6 and the refrigerant circulation pipeline 7. The double sealing rings 10 include an inner fluororubber sealing layer and an outer metal spiral wound gasket sealing layer, which effectively prevents the leakage of cooling water and refrigerant and improves the safety and reliability of the unit operation.

[0027] The unit housing 1 is also equipped with an intelligent control component 11, including a control box 1101 located on the surface of the unit housing 1, an integrated temperature sensor 1102 and a pressure sensor 1103 located inside the unit housing 1, and a PID controller 1104 located inside the control box 1101. It can monitor the unit operating parameters in real time and automatically adjust the working status of the compressor and the throttling device 5 to achieve intelligent control.

[0028] The spiral guide plate 8 has a spiral angle of 15° to 45°, and the surface corrugation height of the corrugated heat exchange tube 9 is 2mm to 5mm, and the corrugation spacing is 10mm to 20mm. These structural parameters have been optimized to maximize heat exchange efficiency without significantly increasing flow resistance.

[0029] The outer casing 1 of the unit is provided with sound insulation cotton and damping coating. The bottom of the screw compressor 3 is provided with a composite vibration reduction structure 12, including a rubber vibration damping base 1201 set at the bottom of the screw compressor 3 and a hydraulic damper 1202 located between the bottom of the screw compressor 3 and the unit base 2. It can effectively absorb and isolate the vibration generated during the operation of the compressor, and reduce the overall vibration and noise of the unit.

[0030] The condenser 4 and evaporator 6 are equipped with pull-out inspection doors 13, which facilitates maintenance personnel to quickly inspect the internal heat exchange tubes without disassembling the entire unit casing 1, thus improving maintenance efficiency.

[0031] It operates based on the principle of vapor compression refrigeration cycle, and the specific working process is as follows:

[0032] 1. Compression process: The screw compressor 3 compresses the low-pressure, low-temperature gaseous refrigerant (such as R134a) from the evaporator 6 into a high-temperature, high-pressure gaseous refrigerant. This process consumes electrical energy, and the refrigerant pressure and temperature increase significantly.

[0033] 2. Condensation Process: High-temperature, high-pressure gaseous refrigerant enters the condenser 4 and exchanges heat with the cooling water flowing in the shell side and tube side. The optimized cooling water flow direction via the spiral guide plate 8 ensures a more uniform water distribution, disrupts the laminar boundary layer, and enhances heat exchange. After releasing heat to the cooling water, the refrigerant condenses into a high-pressure liquid refrigerant.

[0034] 3. Throttling process: The high-pressure liquid refrigerant is depressurized by the throttling device 5 (electronic expansion valve). During the throttling process, the refrigerant temperature decreases and it becomes a low-pressure, low-temperature liquid refrigerant (close to saturation).

[0035] 4. Evaporation Process: Low-pressure, low-temperature liquid refrigerant enters the evaporator 6 and exchanges heat with the chilled water flowing in the tube side. The optimized structure of the corrugated heat exchange tubes 9 increases the contact area and disturbance effect between the refrigerant and the tube wall, enhancing heat exchange performance. After absorbing heat from the chilled water, the refrigerant evaporates into a low-pressure gaseous refrigerant, while the temperature of the chilled water decreases, achieving the refrigeration purpose.

[0036] 5. Cycle process: Low-pressure gaseous refrigerant returns to the compressor to start a new compression process, and so on, continuously providing cooling capacity to the chilled water system.

[0037] The intelligent control component 11 uses a PID algorithm to adjust the compressor speed and the opening of the throttling device 5 in real time, precisely controlling the superheat and condensing pressure at the evaporator outlet 6, ensuring the unit always operates in optimal condition and achieves high-efficiency and energy-saving operation. Simultaneously, by monitoring key parameters (such as pressure, temperature, and flow rate), it provides fault warnings and automatic protection, improving the reliability and safety of the unit's operation.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A water-cooled screw chiller unit comprising a unit housing (1) and a unit base (2), characterized in that: The unit housing (1) is equipped with a screw compressor (3), a condenser (4), a throttling device (5), an evaporator (6), and a refrigerant circulation pipeline (7). The screw compressor (3), condenser (4), throttling device (5), and evaporator (6) are connected in sequence through the refrigerant circulation pipeline (7). The condenser (4) is equipped with a spiral guide plate (8), and the evaporator (6) is equipped with multiple corrugated heat exchange tubes (9). The two ends of the condenser (4) and the evaporator (6) are equipped with double sealing rings (10) at the connection points with the refrigerant circulation pipeline (7). The double sealing rings (10) include an inner fluororubber sealing layer and an outer metal spiral wound gasket sealing layer.

2. The water-cooled screw chiller unit according to claim 1, characterized in that: The surface of the unit housing (1) is also provided with an intelligent control component (11). The intelligent control component (11) includes a control box (1101) located on the surface of the unit housing (1), an integrated temperature sensor (1102), a pressure sensor (1103) located inside the unit housing (1), and a PID controller (1104) located inside the control box (1101).

3. The water-cooled screw chiller unit of claim 1, wherein: The outer shell (1) of the unit is provided with sound insulation cotton and damping coating.

4. The water-cooled screw chiller unit of claim 1, wherein: The spiral guide plate (8) has a spiral angle of 15° to 45°, and the surface corrugation height of the corrugated heat exchange tube (9) is 2mm to 5mm, and the corrugation spacing is 10mm to 20mm.

5. The water-cooled screw chiller unit of claim 1, wherein: The screw compressor (3) is provided with a composite vibration damping structure (12) at the bottom. The composite vibration damping structure (12) includes a rubber vibration damping base (1201) provided at the bottom of the screw compressor (3) and a hydraulic damper (1202) located between the bottom of the screw compressor (3) and the unit base (2). The unit base (2) is provided at the bottom of the hydraulic damper (1202).

6. The water-cooled screw chiller unit of claim 1, wherein: The condenser (4) and evaporator (6) are provided with pull-out inspection doors (13).

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