Oil separator of water-cooling screw unit

Abstract

The utility model discloses an oil separator of a water-cooling screw unit, which relates to the technical field of oil separators and comprises a barrel, an oil return pipe and an air inlet pipe are fixedly mounted at the lower end of the side surface of the barrel, a separation unit and a detection unit are fixedly mounted inside the barrel, the upper end of the barrel is connected with an end cover through bolts, and an exhaust pipe is fixedly mounted on the end cover. The oil-gas separation device has the beneficial effects that the rotating spiral filter screen drives an oil-gas mixture to rotate, so that oil is centrifugally separated, the oil capturing and separating efficiency and quality are improved through the spiral filter screen, the filter screen and the oil-gas mixture are cooled through a cold air conveying assembly, a gas guide cavity and a heat exchange pipe, condensation and separation of the oil are accelerated, and the oil-gas separation efficiency is improved. Through a multi-element cooperation mode of centrifugal separation and cooling capture, the oil-liquid separation efficiency and quality are effectively improved, a filter screen firstly separates most of oil liquid, the separation pressure and the blocking risk of a subsequent filter element mechanism are reduced, and the service life and the replacement period of the filter element mechanism are greatly prolonged.

Description

An oil separator for a water-cooled screw compressor unit Technical Field

[0001] This utility model relates to the field of oil separator technology, and in particular to an oil separator for a water-cooled screw compressor unit. Background Technology

[0002] Water-cooled screw chillers are a type of water-cooled chiller. Since their main component uses screw compressors, the separator is an auxiliary device in water-cooled screw chillers. Its function is to separate the lubricating oil from the high-pressure steam discharged from the compressor and reintroduce the lubricating oil into the compressor to ensure the efficient operation of the unit.

[0003] A search revealed that Chinese patent application CN219199573U discloses an oil separator for a water-cooled screw compressor unit, which mainly achieves oil-gas separation through a first separation component and a second separation component.

[0004] Compared with existing technologies in related fields, traditional oil separators rely on gravity, simple filters, and other methods to separate oil and gas. This results in insufficient oil-liquid separation, which increases the burden on the filter element, shortens its service life, and reduces separation efficiency and quality. Summary of the Invention

[0005] The purpose of this invention is to provide an oil separator for a water-cooled screw compressor unit in order to solve the above-mentioned problems.

[0006] This utility model achieves the above objectives through the following technical solutions:

[0007] An oil separator for a water-cooled screw compressor unit includes a cylinder, an oil return pipe and an air inlet pipe fixedly installed on the lower side of the cylinder, a separation unit and a detection unit fixedly installed inside the cylinder, and an end cover connected to the upper end of the cylinder by bolts, with an exhaust pipe fixedly installed on the end cover.

[0008] The separation unit includes a filter element mechanism, a motor, and a rotating shaft. A cold air delivery assembly is fixedly installed inside the cylinder. The filter element mechanism is installed inside the upper part of the cylinder and is located above the cold air delivery assembly. The motor is fixedly installed on the lower surface of the cylinder. The rotating shaft is a sealed rotatable connection between the cylinder and the cold air delivery assembly. The rotating shaft is fixedly connected to the output shaft of the motor. A filter screen is fixedly installed on the rotating shaft. An air guide chamber communicating with the cold air delivery assembly is provided inside the rotating shaft. The filter screen is located below the cold air delivery assembly.

[0009] Furthermore, the cold air conveying assembly includes an air guide seat, an inlet pipe, and an outlet pipe. The inlet pipe and the outlet pipe are respectively installed on both sides of the cylinder. The portions of the inlet pipe and the outlet pipe located inside the cylinder are fixedly connected to the air guide seat. The inlet pipe and the outlet pipe are respectively connected to both ends of the air guide chamber.

[0010] Furthermore, the filter screen is spiral-shaped, and an anti-stick coating is fixed on the surface of the filter screen.

[0011] Furthermore, a support rod is fixedly installed on the rotating shaft, and an elastic block is fixedly installed at the end of the support rod. A scraper is fixedly connected to the elastic block, and the scraper is slidably connected to the inner wall of the cylinder.

[0012] Furthermore, heat exchange tubes are fixedly arranged on the rotating shaft, the heat exchange tubes are connected to the air guide cavity, and the heat exchange tubes are attached to the lower surface of the filter screen.

[0013] Furthermore, the detection unit includes a first pressure detection mechanism and a second pressure detection mechanism. The first pressure detection mechanism is fixedly installed on the upper surface of the end cap, and the second pressure detection mechanism is installed on the side of the cylinder. The first pressure detection mechanism and the second pressure detection mechanism are respectively connected to the upper and lower ends of the filter element mechanism.

[0014] Furthermore, a safety exhaust valve is fixedly installed on the upper surface of the end cap, and the safety exhaust valve is connected to the inside of the cylinder.

[0015] The advantages compared to existing technologies are as follows:

[0016] 1. The rotating spiral filter screen drives the oil-gas mixture to rotate, causing the oil to separate centrifugally. The spiral shape of the filter screen increases the contact area with the oil and gas, improving the efficiency and quality of oil capture and separation. At the same time, the cold air delivery component, air guide chamber, and heat exchange pipe cool the filter screen and the oil-gas mixture, accelerating the condensation and separation of the oil. Through the multi-faceted synergistic approach of centrifugal separation and cooling capture, the efficiency and quality of oil separation are effectively improved. The filter screen separates most of the oil first, reducing the separation pressure on the subsequent filter element mechanism, reducing the risk of filter element clogging, significantly extending the service life and replacement cycle of the filter element mechanism, reducing operation and maintenance costs, and ensuring the cleanliness of the separated gas.

[0017] 2. The rotating shaft drives the scraper to scrape against the inner wall of the cylinder through the support rod and elastic block, cleaning the oil adhering to the inner wall of the cylinder, preventing the oil from being mixed with gas again, further ensuring the separation effect, and maintaining the high efficiency and stability of oil-liquid separation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 is a first isometric structural schematic diagram of the oil separator of a water-cooled screw compressor unit according to the present invention.

[0020] Figure 2 is a partial cross-sectional structural schematic diagram of the oil separator of a water-cooled screw compressor unit according to the present invention;

[0021] Figure 3 is an enlarged structural schematic diagram of point A in Figure 2 of the oil separator of the water-cooled screw compressor unit described in this utility model;

[0022] Figure 4 is a partial structural schematic diagram of the oil separator of a water-cooled screw compressor unit according to the present invention;

[0023] Figure 5 is an enlarged structural schematic diagram of point B in Figure 4 of the oil separator of the water-cooled screw compressor unit described in this utility model;

[0024] Figure 6 is a second isometric structural schematic diagram of the oil separator of a water-cooled screw compressor unit according to the present invention.

[0025] The annotations in the attached figures are explained as follows:

[0026] 1. Cylinder body; 2. End cap; 301. Filter element mechanism; 302. Motor; 303. Rotating shaft; 304. Air guide chamber; 305. Air guide seat; 306. Feed pipe; 307. Discharge pipe; 308. Filter screen; 309. Support rod; 310. Elastic block; 311. Scraper; 312. Heat exchange tube; 4. Oil return pipe; 5. Exhaust pipe; 6. Air inlet pipe; 7. First pressure detection mechanism; 8. Second pressure detection mechanism; 9. Safety exhaust valve. Detailed Implementation

[0027] As shown in Figures 1-6, an oil separator for a water-cooled screw compressor unit includes a cylinder 1. An oil return pipe 4 and an air inlet pipe 6 are fixedly installed on the lower side of the cylinder 1. A separation unit and a detection unit are fixedly installed inside the cylinder 1. An end cap 2 is bolted to the upper end of the cylinder 1, and an exhaust pipe 5 is fixedly installed on the end cap 2. The cylinder 1 and the end cap 2 are connected by bolts for easy maintenance and repair. The air inlet pipe 6 and the oil return pipe 4 are connected to the compressor of the water-cooled screw compressor unit, and the exhaust pipe 5 is connected to the condenser of the water-cooled screw compressor unit. During operation, the compressor of the water-cooled screw compressor unit delivers an oil-gas mixture to the air inlet pipe 6, which then enters the cylinder 1. The separation unit separates the oil-gas mixture, and the detection unit monitors the pressure inside the cylinder 1 in real time during the separation process to ensure safety. The separated oil flows back to the compressor of the water-cooled screw compressor unit through the oil return pipe 4, and the separated gas flow is discharged to the condenser of the water-cooled screw compressor unit for further processing through the exhaust pipe 5.

[0028] As shown in Figures 1-6, the separation unit includes a filter element mechanism 301, a motor 302, and a rotating shaft 303. A cold air conveying assembly is fixedly installed inside the cylinder 1. The filter element mechanism 301 is installed inside the upper part of the cylinder 1, above the cold air conveying assembly. The motor 302 is fixedly installed on the lower surface of the cylinder 1. The rotating shaft 303 provides a sealed rotatable connection between the cylinder 1 and the cold air conveying assembly. The rotating shaft 303 is fixedly connected to the output shaft of the motor 302, and a filter element is fixedly installed on the rotating shaft 303. The filter screen 308 and the rotating shaft 303 are equipped with an air guide chamber 304 that connects to the cold air conveying assembly. The filter screen 308 is located below the cold air conveying assembly. The filter element mechanism 301 is installed inside the cylinder 1. After the oil-gas mixture enters the cylinder 1, the rotating shaft 303 is driven to rotate by the motor 302. The rotating shaft 303 drives the filter screen 308 to rotate, and the rotating filter screen 308 drives the oil-gas mixture inside the cylinder 1 to rotate, which facilitates the centrifugal separation of the oil. At the same time, the rotation of the filter screen 308... During operation, the filter screen 308 increases the contact area with the oil-gas mixture, capturing and separating the oil. As the filter screen 308 rotates, the captured oil falls off, preventing it from accumulating on the filter screen 308 and ensuring its effective oil capture and separation. Simultaneously, the cold air delivery component delivers cold air into the air guide chamber 304. The cold air in the air guide chamber 304 exchanges heat with the filter screen 308 through the rotating shaft 303, cooling the surrounding oil-gas mixture and promoting oil condensation and separation. This effectively improves the efficiency and quality of oil-gas separation. The airflow, after initial separation by the filter screen 308, enters the filter element mechanism 301, where it further filters and separates the oil in the oil-gas mixture, ensuring the cleanliness of the separated gas. By increasing the oil separation effect of the filter screen 308, the pressure of the filter element mechanism 301 in separating the oil is reduced, extending its service life and lowering costs.

[0029] As shown in Figures 2-4 and 6, the cold air conveying assembly includes an air guide seat 305, an inlet pipe 306, and an outlet pipe 307. The inlet pipe 306 and outlet pipe 307 are respectively installed on both sides of the cylinder 1. The portions of the inlet pipe 306 and outlet pipe 307 located inside the cylinder 1 are fixedly connected to the air guide seat 305. The inlet pipe 306 and outlet pipe 307 are respectively connected to both ends of the air guide chamber 304. The inlet pipe 306 and outlet pipe 307 are not interconnected. The inlet pipe 306 is connected to the cold air end of the water-cooled screw compressor unit. During operation, cold air flows through the inlet pipe 305. 6. The cold air enters the air guide seat 305 and then enters the air guide chamber 304. When the cold air flows in the air guide chamber 304, it can exchange heat and cool down the rotating shaft 303. The cooled cold air enters the discharge pipe 307 through the air guide chamber 304 and is discharged through the discharge pipe 307. The cold air circulation is formed by the air guide seat 305, the feed pipe 306, the discharge pipe 307 and the air guide chamber 304. The circulating cold air cools the oil-gas separation area through the rotating shaft 303. The cold air cooling accelerates the oil accumulation and improves the separation effect.

[0030] As shown in Figures 2-5, the filter screen 308 is spiral-shaped, and an anti-stick coating is fixed on its surface. During the oil-gas separation process, the filter screen 308 is rotated by the rotating shaft 303. After the oil and gas enter the cylinder 1, they flow spirally along the trajectory of the spiral filter screen 308, which facilitates the separation of oil under the action of centrifugal force. The spiral design increases the contact area between the filter screen 308 and the oil and gas, so that the oil is separated under the action of centrifugal force and the capture action of the filter screen 308, which enhances the centrifugal separation effect and capture rate of oil. The anti-stick coating can effectively reduce the adhesion of oil on the surface of the filter screen 308, ensure the continuous and efficient operation of the filter screen 308, avoid the impact of oil accumulation on the separation efficiency, and extend the cleaning and maintenance cycle of the filter screen 308.

[0031] As shown in Figures 2, 4, and 5, a support rod 309 is fixedly installed on the rotating shaft 303. An elastic block 310 is fixedly installed at the end of the support rod 309. A scraper 311 is fixedly connected to the elastic block 310. The scraper 311 is slidably connected to the inner wall of the cylinder 1. During the oil-gas separation process, under the elastic force of the elastic block 310, the elastic block 310 supports the scraper 311 to adhere to the inner wall of the cylinder 1, ensuring the cleaning effect of the scraper 311 on the inner wall of the cylinder 1. The rotating shaft 303 drives the scraper 311 to rotate along the inner wall of the cylinder 1 through the support rod 309 and the elastic block 310. The scraper 311 scrapes the separated oil off the inner wall of the cylinder 1, so that the separated oil falls into the lower end of the cylinder 1 for easy oil processing. At the same time, the scraping and cleaning of the oil on the inner wall of the cylinder 1 by the scraper 311 prevents the oil from being mixed with gas again, ensuring the efficiency of oil-gas separation.

[0032] As shown in Figures 4 and 5, heat exchange tubes 312 are fixedly arranged on the rotating shaft 303. The heat exchange tubes 312 are connected to the air guide cavity 304 and are attached to the lower surface of the filter screen 308. During the oil-gas separation process, cold air enters the heat exchange tubes 312 through the air guide cavity 304, thereby cooling the heat exchange tubes 312. Since the heat exchange tubes 312 are attached to the lower surface of the filter screen 308, they exchange heat with the filter screen 308, reducing the temperature of the filter screen 308. When the filter screen 308 rotates, it exchanges heat with the oil and gas, reducing the temperature of the oil and gas, promoting the condensation of oil on the filter screen 308, and accelerating the oil aggregation and separation. At the same time, the rotation of the rotating shaft 303 drives the heat exchange tubes 312, making the cooling effect more uniform and improving the overall separation effect and efficiency.

[0033] As shown in Figures 1, 2, and 6, the detection unit includes a first pressure detection mechanism 7 and a second pressure detection mechanism 8. The first pressure detection mechanism 7 is fixedly installed on the upper surface of the end cover 2, and the second pressure detection mechanism 8 is installed on the side of the cylinder 1. The first pressure detection mechanism 7 and the second pressure detection mechanism 8 are respectively connected to the upper and lower ends of the filter element mechanism 301. During the oil-gas separation process, the first pressure detection mechanism 7 detects the gas pressure at the upper end of the filter element mechanism 301, and the second pressure detection mechanism 8 detects the gas pressure at the lower end of the filter element mechanism 301. The first pressure detection mechanism 7 and the second pressure detection mechanism 8 monitor the pressure difference on both sides of the filter element mechanism 301 in real time, reflecting the operating status of the filter element mechanism 301, such as the degree of blockage. This facilitates the timely detection of problems such as blockage and failure of the filter element mechanism 301, ensuring the stability of the separation process; providing data for equipment maintenance, avoiding the impact of filter element mechanism 301 failure on the oil-gas separation effect, and ensuring separation efficiency and quality.

[0034] As shown in Figures 1 and 6, a safety exhaust valve 9 is fixedly installed on the upper surface of the end cover 2. The safety exhaust valve 9 is connected to the inside of the cylinder 1. During the oil-gas separation process, when the pressure inside the cylinder 1 exceeds the set threshold of the safety exhaust valve 9, the safety exhaust valve 9 can automatically start, thereby releasing the pressure inside the cylinder 1. After the pressure inside the cylinder 1 returns to normal, the safety exhaust valve 9 closes again. The safety exhaust valve 9 provides a safety protection mechanism for the entire oil separator, avoiding risks such as equipment damage and oil-gas leakage due to excessive internal pressure, ensuring the stable operation of the water-cooled screw compressor unit and the oil separator, and improving equipment reliability.

[0035] Working Principle: As shown in Figures 1-6, the compressor of the water-cooled screw chiller delivers the oil-gas mixture to the inlet pipe 6, and then into the cylinder 1. The motor 302 drives the rotating shaft 303 to rotate, which in turn drives the filter screen 308 to rotate. The rotating filter screen 308 causes the oil-gas mixture in the cylinder 1 to rotate, resulting in centrifugal separation of the oil. The separated oil falls to the lower end of the cylinder 1. At the same time, during the rotation of the filter screen 308, the spiral shape of the filter screen 308 increases the contact area with the oil-gas mixture, capturing and separating the oil. The oil separated on the filter screen 308 falls off during the rotation. The airflow after preliminary separation by the filter screen 308 enters the filter element mechanism 301, which filters and separates the oil in the oil-gas mixture again. The separated oil flows back to the compressor of the water-cooled screw chiller through the oil return pipe 4. The separated airflow is discharged to the condenser of the water-cooled screw chiller through the exhaust pipe 5 for further processing.

[0036] As shown in Figures 2-4 and 6, cold air enters the air guide seat 305 through the feed pipe 306 and then enters the air guide chamber 304 through the air guide seat 305. When the cold air flows in the air guide chamber 304, it can exchange heat and cool down the rotating shaft 303 and the heat exchange tube 312. The rotating shaft 303 and the heat exchange tube 312 cool down the filter screen 308, and the filter screen 308 cools down the oil-gas mixture, which facilitates the cooling and condensation of the oil and improves the efficiency of oil separation. The cooled cold air enters the discharge pipe 307 through the air guide chamber 304 and is discharged through the discharge pipe 307.

[0037] As shown in Figures 2, 4, and 5, the elastic block 310 supports the scraper 311, which is attached to the inner wall of the cylinder 1. The rotating shaft 303 drives the scraper 311 to rotate along the inner wall of the cylinder 1 via the support rod 309 and the elastic block 310. The scraper 311 scrapes off the oil separated on the inner wall of the cylinder 1, causing the separated oil to fall into the lower end of the cylinder 1 for backflow.

[0038] As shown in Figures 1, 2, and 6, during the oil-gas separation process, the gas pressure at the upper end of the filter element mechanism 301 is detected by the first pressure detection mechanism 7, and the gas pressure at the lower end of the filter element mechanism 301 is detected by the second pressure detection mechanism 8. The pressure difference between the two sides of the filter element mechanism 301 is monitored in real time by the first pressure detection mechanism 7 and the second pressure detection mechanism 8 to understand the working status of the filter element mechanism 301. When the filter element mechanism 301 is clogged, it can be replaced in time to ensure the filtration and separation effect of the filter element mechanism 301.

[0039] As shown in Figures 1 and 6, during the oil-gas separation process, when the pressure inside the cylinder 1 exceeds the set threshold of the safety exhaust valve 9, the safety exhaust valve 9 is automatically activated to release the pressure inside the cylinder 1, thereby improving safety.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An oil separator for a water-cooled screw compressor unit, characterized in that, The system includes a cylinder (1), with a return oil pipe (4) and an air inlet pipe (6) fixedly installed on the lower side of the cylinder (1). A separation unit and a detection unit are fixedly installed inside the cylinder (1). An end cap (2) is bolted to the upper end of the cylinder (1), and an exhaust pipe (5) is fixedly installed on the end cap (2). The separation unit includes a filter element mechanism (301), a motor (302), and a rotating shaft (303). A cold air conveying assembly is fixedly installed inside the cylinder (1). The filter element mechanism (301) is installed inside the upper part of the cylinder (1). The filter element mechanism (301) is located above the cold air delivery assembly. The motor (302) is fixedly installed on the lower surface of the cylinder (1). The rotating shaft (303) is sealed and rotatably connected to the cylinder (1) and the cold air delivery assembly. The rotating shaft (303) is fixedly connected to the output shaft of the motor (302). A filter screen (308) is fixedly installed on the rotating shaft (303). An air guide chamber (304) communicating with the cold air delivery assembly is provided inside the rotating shaft (303). The filter screen (308) is located below the cold air delivery assembly.

2. The oil separator for a water-cooled screw compressor unit according to claim 1, characterized in that: The cold air conveying assembly includes an air guide seat (305), an inlet pipe (306), and an outlet pipe (307). The inlet pipe (306) and the outlet pipe (307) are respectively installed on both sides of the cylinder (1). The portions of the inlet pipe (306) and the outlet pipe (307) located inside the cylinder (1) are fixedly connected to the air guide seat (305). The inlet pipe (306) and the outlet pipe (307) are respectively connected to both ends of the air guide cavity (304).

3. The oil separator for a water-cooled screw compressor unit according to claim 1, characterized in that: The filter screen (308) is spiral-shaped, and an anti-stick coating is fixed on the surface of the filter screen (308).

4. The oil separator for a water-cooled screw compressor unit according to claim 1, characterized in that: A support rod (309) is fixedly installed on the rotating shaft (303). An elastic block (310) is fixedly installed at the end of the support rod (309). A scraper (311) is fixedly connected to the elastic block (310). The scraper (311) is slidably connected to the inner wall of the cylinder (1).

5. The oil separator for a water-cooled screw compressor unit according to claim 1, characterized in that: Heat exchange tubes (312) are fixedly arranged on the rotating shaft (303), the heat exchange tubes (312) are connected to the air guide cavity (304), and the heat exchange tubes (312) are attached to the lower surface of the filter screen (308).

6. The oil separator for a water-cooled screw compressor unit according to claim 1, characterized in that: The detection unit includes a first pressure detection mechanism (7) and a second pressure detection mechanism (8). The first pressure detection mechanism (7) is fixedly installed on the upper surface of the end cap (2), and the second pressure detection mechanism (8) is installed on the side of the cylinder (1). The first pressure detection mechanism (7) and the second pressure detection mechanism (8) are respectively connected to the upper and lower ends of the filter element mechanism (301).

7. The oil separator for a water-cooled screw compressor unit according to claim 1, characterized in that: A safety exhaust valve (9) is fixedly installed on the upper surface of the end cap (2), and the safety exhaust valve (9) is connected to the interior of the cylinder (1).

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