A screw process gas compressor and an exhaust process within the same

Abstract

The application provides a screw type process gas compressor and an internal exhaust process thereof, and the internal exhaust process mainly comprises the following steps: power-on before starting, opening a waste gas outlet, opening a nitrogen inlet, exhausting waste gas by nitrogen, closing the nitrogen inlet, opening a process gas inlet, detecting the gas concentration of the waste gas outlet, closing the waste gas outlet, opening an outlet, and closing before stopping, wherein the process gas is replaced by nitrogen before stopping, nitrogen is conveyed into the compressor before compressing the process gas, so that the waste gas in the compressor is exhausted, the purity of the process gas is increased by using the inertness and stability of nitrogen, the process gas in the compressor is exhausted by conveying nitrogen into the compressor after compressing the process gas, the safety of the operator during disassembly, maintenance and maintenance is facilitated, and the process gas explosion during disassembly is prevented.

Description

Technical Field

[0001] This invention relates to air compressors, and more particularly to a screw-type process gas compressor and its internal exhaust process. Background Technology

[0002] An air compressor, or simply air compressor, is a device that compresses gas. Most air compressors are reciprocating piston type, rotary vane type, or rotary screw type. The rotary vane type is similar in structure to a water pump, while the rotary screw type compresses air by changing the gas volume.

[0003] The inventor previously developed an air compressor with application publication number CN115450915A, which includes a compressor host and a motor for driving the compressor host. The side of the host host is equipped with a gas-liquid separator, a radiator and a filter. The radiator is connected to the cavity of the host host. The host host is cooled by spraying cooling liquid into the cavity. The compressed gas and the cooling liquid are mixed into a gas-liquid mixture under pressure and then enter the gas-liquid separator for separation, thereby achieving the purpose of reducing the gas temperature.

[0004] When compressing process gases, residual exhaust gas inside the compressor mixes with the process gas, which leads to a decrease in the purity of the process gas and affects the compression quality. At the same time, the compression of active gases after mixing may pose certain dangers. Summary of the Invention

[0005] In view of this, the first objective of the present invention is to provide an internal exhaust process that has the advantage of exhausting waste gas from inside the compressor.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: an internal exhaust process, mainly comprising the following steps: S1: Pre-start procedure: Power on the compressor and its control box; S2: Open exhaust gas outlet: Control the exhaust gas valve to open; S3: Open nitrogen inlet: Control the opening of the nitrogen valve to allow nitrogen to enter the compressor; S4: Compressed nitrogen: Nitrogen is compressed by the compressor and enters the gas-liquid separator (6) to replace the exhaust gas in the compressor and the gas-liquid separator (6), and nitrogen is discharged through the exhaust outlet. S5: Close nitrogen inlet: Controls the nitrogen valve to close and stops nitrogen input; S6: Open the process gas inlet: Control the process gas inlet valve to open and replace the nitrogen in the compressor and gas-liquid separator (6) with process gas; S7: Detection: Detect the gas concentration at the exhaust outlet through the gas sampling port; S8: Close the exhaust gas outlet: When the gas concentration at the gas sampling monitoring port in S7 meets the standard, close the exhaust gas outlet valve; S9: Open the outlet: Control the outlet valve to open and allow process gas to be discharged; S10: Pre-shutdown treatment: Control the opening of the waste gas outlet valve to divert process gas; S11: Replace process gas: Close the outlet valve and the process gas inlet valve, and at the same time open the nitrogen inlet valve. Replace the process gas in the compressor and gas-liquid separator (6) with nitrogen and discharge it from the exhaust outlet. S12: Shutdown: Close all valves of the compressor and disconnect the power.

[0007] By using the above-mentioned technical means, nitrogen is introduced into the compressor before the process gas is compressed, thereby expelling the waste gas from the compressor. By utilizing the inertness and stability of nitrogen, the purity of the process gas is increased. By introducing nitrogen back into the compressor after the process gas is compressed, the process gas inside the compressor is expelled. This facilitates the safety of operators during disassembly, inspection, and maintenance, and prevents process gas explosions during disassembly.

[0008] A second objective of this invention is to provide a screw-type process gas compressor for implementing an internal exhaust process.

[0009] The present invention provides a screw-type process gas compressor, comprising a compression chamber and a drive motor. The compression chamber has an inlet and an outlet at both ends, and a gas-liquid separator and a radiator are also provided on the side of the compressor. The gas-liquid separator has an inlet and an outlet at both ends, and a gas pipe connects the outlet and the inlet. A return pipe connects the radiator and the compression chamber, and the radiator drives coolant into the compression chamber.

[0010] Using the above-mentioned technical means, coolant is introduced into the compression chamber through the return pipe to reduce the temperature of the gas in the compression chamber and form a gas-liquid mixture. By setting a gas-liquid separator on the side of the compressor and introducing the gas-liquid mixture into the gas-liquid separator, process gas and water are separated.

[0011] Preferably, the compression chamber has an internal cavity, a screw is installed inside the cavity, an injection hole is provided on the inner wall of the cavity, the return pipe is connected to the injection hole, and a flow control device is also provided inside the inner wall of the cavity to control the flow rate of coolant entering the cavity.

[0012] By using the above-mentioned technical means, the flow rate of coolant entering the cavity is controlled by the flow control device, thereby preventing coolant from accumulating in the cavity or entering too little coolant, which would affect the gas compression quality and compression temperature.

[0013] Preferably, the injection hole (15) includes a piston chamber (17), a liquid hole one (18) and a liquid hole two (19). The piston chamber (17) is opened on the inner wall of the air outlet one (5). The liquid hole one (18) and the liquid hole two (19) are both connected to the piston chamber (17). The flow control device (16) includes a piston block (22) and an impeller (23). One end of the piston block (22) is disposed in the piston chamber (17) and is slidably connected to the piston chamber (17). The impeller (23) is rotatably connected to the inner wall of the air outlet one (5). A rocker arm (24) is also provided between the impeller (23) and the tail of the piston block (22). One end of the rocker arm (24) is eccentrically hinged to the end face of the impeller (23), and the other end is hinged to the tail of the piston block (22).

[0014] By using the above-mentioned technical means, the screw is rotated by the drive motor to form unidirectional air pressure, so that the speed ratio of the impeller and the drive motor is consistent. The piston block is driven by the rocker arm to move in the piston chamber, thereby realizing the spraying of coolant. The faster the drive motor rotates, the greater the gas flow and the greater the amount of coolant sprayed, thus automatically adjusting the coolant spraying efficiency.

[0015] Preferably, a one-way valve is hinged to one side of the air pipe near the air outlet. The one-way valve is provided with a sealing rubber plate and an elastic element. The elastic element drives the one-way valve to close the air pipe.

[0016] By using the above-mentioned technical means, the one-way valve plate closes the first outlet, so that the one-way valve plate automatically closes when the compressor is turned off. This prevents gas from flowing back into the cavity when the gas-liquid separator has high pressure, which would cause the screw to reverse and affect the service life of the air compressor.

[0017] Preferably, a square connecting pipe is provided on the side of the air pipe near the air outlet. One end of the square connecting pipe is hinged to the one-way valve plate, and the other end is provided with a through groove. A stop rod is provided in the through groove. An inclined guide block is also provided at the tail of the piston block. An inclined guide surface is provided at the end of the stop rod. When the one-way valve plate is closed, one end of the one-way valve plate presses against the stop rod and moves the inclined guide surface against the inclined guide block, and pushes the piston block toward the liquid hole two to block the communication between the liquid hole one and the liquid hole two.

[0018] Through the above-mentioned technical means, the force of the one-way valve plate when it is closed and the pressure in the gas-liquid separator cause the push rod to press against the inclined guide block, thereby blocking the liquid hole one by the piston block and preventing the coolant from entering the cavity when the compressor is turned off, which would cause the screw and other parts to rust.

[0019] Preferably, a reset block is also provided on the inner wall of the trachea, and a tension spring is provided between the reset block and the push rod. The tension spring is used to pull the push rod upward and to disengage the inclined guide surface from the inclined guide block.

[0020] By using the above-mentioned technical means, a tension spring is installed between the reset block and the push rod, thereby separating the push rod from the inclined guide block during the operation of the compressor, thus reducing the wear between the push block and the inclined guide block and increasing their service life. Attached Figure Description

[0021] Figure 1 This is a process flow diagram of Example 1; Figure 2 This is a schematic diagram of the structure of Example 2; Figure 3 This is a cross-sectional schematic diagram of Example 2; Figure 4 for Figure 3 Enlarged view of part A; Figure 5 This is a schematic diagram of the flow control device.

[0022] Reference numerals: 1. Compression chamber; 2. Drive motor; 3. Screw; 4. Air inlet 1; 5. Air outlet 1; 6. Gas-liquid separator; 7. Radiator; 8. Air inlet 2; 9. Air outlet 2; 10. Drain outlet; 11. Air pipe; 12. Return pipe; 13. Water filter; 14. Cavity; 15. Liquid injection hole; 16. Flow control device; 17. Piston chamber; 18. Liquid hole 1; 19. Liquid hole 2; 20. One-way valve plate; 21. Nozzle; 22. Piston block; 23. Impeller; 24. Rocker arm; 25. Square connecting pipe; 26. One-way valve plate; 27. Sealing plate; 28. Hinge rod; 29. ​​Through groove; 30. Push rod; 31. Angled guide block; 32. Reset block; 33. Tension spring; 34. Angled guide surface. Detailed Implementation

[0023] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and mastered. Example 1:

[0024] An internal exhaust process mainly includes the following steps: S1: Pre-start process, which powers on the compressor and its control box, at which point all valves are closed; S2: Open the exhaust gas outlet by controlling the exhaust gas valve to open via the control cabinet; S3: Open the nitrogen inlet and control the nitrogen valve to open via the control cabinet, allowing nitrogen to enter the compressor. S4: Compressed nitrogen gas. Nitrogen gas is compressed by the compressor and enters the gas-liquid separator 6, so that the nitrogen gas replaces the exhaust gas in the compressor and the gas-liquid separator 6. At the same time, nitrogen gas and exhaust gas are discharged through the exhaust gas outlet. The nitrogen gas input time is 30 seconds. S5: Close the nitrogen inlet. Close the nitrogen inlet via the control cabinet to stop nitrogen input. S6: Open the process gas inlet. The process gas inlet is opened by controlling the control cabinet. The process gas replaces the nitrogen in the compressor and gas-liquid separator 6. Nitrogen is an inert gas, so the process gas is less likely to cause explosions or other dangers. S7: Detection, detecting the concentration of process gas at the exhaust outlet; S8: Close the exhaust gas outlet. When the gas concentration reaches the standard, the exhaust gas outlet will be closed through the control cabinet. S9: Open the air outlet. The air outlet is opened through the control cabinet to allow the process gas to be discharged. S10: Pre-shutdown treatment, the process gas is diverted by opening the exhaust gas outlet through the control cabinet; S11: Replace process gas. Close the gas outlet and process gas inlet through the control cabinet, and open the nitrogen inlet for 30 seconds. Replace the process gas in the compressor and gas-liquid separator 6 with nitrogen and discharge it from the exhaust outlet. S12: Shut down the machine, close all valves of the compressor and disconnect the power.

[0025] By utilizing the inertness and stability of nitrogen, the purity of the process gas is increased. By re-introducing nitrogen into the compressor after compressing the process gas, the process gas inside the compressor is discharged, which facilitates the safety of operators during disassembly, inspection, and maintenance, and prevents process gas explosions caused by collisions of parts during disassembly. Example 2:

[0026] The screw-type process gas compressor includes a compression chamber 1 and a drive motor 2. A screw 3 is installed inside the compression chamber 1, with one end of the screw 3 protruding from the compression chamber 1 and connected to the drive motor 2. An air inlet 4 and an air outlet 5 are respectively provided at both ends of the compression chamber 1. The air inlet 4 and the air outlet 5 are respectively located at the tail and head of the screw 3. A gas-liquid separator 6 and a radiator 7 are also provided on the side of the compressor. The gas-liquid separator 6 is a water-gas separator. An air inlet 8 and an air outlet 9 are respectively provided at both ends of the gas-liquid separator 6. A drain outlet 10 is provided at the bottom. A gas pipe 11 connects the air outlet 5 and the air inlet 8. After the compressed gas enters the gas-liquid separator 6 from the compression chamber 1, it is separated by gravity. The water sinks to the bottom of the gas-liquid separator 6, and the gas is discharged from the upper air outlet 9.

[0027] Inlet 4 includes a nitrogen inlet and a process gas inlet. Inlet 4 is equipped with a flame arrester and a filter to prevent explosion and filter gas impurities. An exhaust temperature sensor is also installed at outlet 5 to detect the temperature of outlet 5. Outlet 9 includes a process gas outlet and a waste gas outlet. A gas concentration meter is installed at the waste gas outlet to detect the quality of the gas.

[0028] A return pipe 12 connects the radiator 7 and the compression chamber 1. After the radiator 7 lowers the temperature of the coolant, it drives the coolant to enter the compression chamber 1 through the return pipe 12. The coolant is softened water. The gas-liquid separator 6 is connected to the radiator 7 and a water filter 13 is also installed between them. The wastewater after gas-liquid separation enters the radiator 7 again for cooling after passing through the water filter 13, thereby increasing the environmental friendliness of the equipment. A liquid level float switch is installed in the gas-liquid separator 6. When the water level is too high, the drain port 10 at the bottom of the separator opens to drain the water.

[0029] The compression chamber 1 has a cavity 14 inside, and the screw 3 is installed inside the cavity 14. A liquid injection hole 15 is provided on the inner wall of the cavity 14. The return pipe 12 communicates with the liquid injection hole 15. A flow control device 16 is also installed inside the inner wall of the cavity 14 to control the flow rate of coolant entering the cavity 14. The liquid injection hole 15 includes a piston chamber 17, a liquid hole 18, and a liquid hole 19. The piston chamber 17 is located on the inner wall of the outlet 5. One end of the liquid hole 18 communicates with the side wall of the piston chamber 17, and the other end communicates with... The return pipe 12 is connected, one end of the liquid hole 19 is connected to the bottom surface of the piston chamber 17, and the other end faces the screw 3. A one-way valve 20 and a nozzle 21 are installed in the liquid hole 19. Both the one-way valve 20 and the nozzle 21 face the cavity 14. The flow control device 16 includes a piston block 22 and an impeller 23. One end of the piston block 22 is installed in the piston chamber 17 and is slidably connected to the piston chamber 17. The impeller 23 is rotatably connected to the inner wall of the outlet 5. A rocker arm 24 is also provided between the impeller 23 and the tail of the piston block 22. The rocker arm 24... One end is hinged to the end face of the impeller 23, and the other end is hinged to the tail of the piston block 22. When gas passes through the outlet 5, the gas drives the impeller 23 to rotate. When the impeller 23 rotates, the rocker arm 24 drives the piston block 22 to move within the piston chamber 17. When the hinge point between the rocker arm 24 and the impeller 23 is furthest from the piston block 22, the liquid hole 18 communicates with the piston chamber 17, and the coolant in the liquid hole 18 enters the piston chamber 17. When the hinge point between the rocker arm 24 and the impeller 23 is closest to the piston block 22, the piston block 22 blocks the liquid hole 18. 18 and piston chamber 17, and push the water in piston chamber 17 out of liquid hole 29. When rocker arm 24 pulls the piston to move, piston chamber 17 is in a negative pressure state. When piston chamber 17 is connected to liquid hole 18, the negative pressure will cause coolant to enter piston chamber 17 quickly. The faster the motor rotates, the greater the air intake, which causes impeller 23 to rotate faster. The more times piston block 22 moves, the more water is sprayed. The water spray volume is proportional to the motor rotation power, thus realizing the function of automatically adjusting the coolant spraying efficiency.

[0030] A square connecting pipe 25 is provided on the side of the air pipe 11 near the air outlet 5. One-way valve plate 20 is also hinged to one end of the inner wall of the square connecting pipe 25. Sealing plate 27 is provided on the one-way valve plate 20. Elastic element, including torsion spring, is provided on the one-way valve plate 20. A hinge rod 28 is provided on one end of the one-way valve plate 20. The torsion spring is sleeved on the hinge rod 28. One end of the torsion spring abuts against the side wall of the air outlet 5, and the other end abuts against the one-way valve plate 20, driving the one-way valve plate 20 to flip down and close the air pipe 11. When the motor is running, the pressure in the cavity 14 of the compression chamber 1 is greater than the pressure in the air pipe 11, thereby pushing the one-way valve plate 20 to open. When the compressor is turned off, the one-way valve plate 20 automatically closes, thereby preventing gas from flowing back into the cavity 14 when the air pressure in the gas-liquid separator 6 is high after the cavity is depressurized, causing the screw 3 to reverse and affecting the service life of the air compressor.

[0031] A through groove 29 is provided at the other end of the square connecting pipe 25. A stop rod 30 is slidably arranged in the through groove 29. An inclined guide block 31 is also provided at the tail of the piston block 22. An inclined guide surface 34 is provided at the end of the stop rod 30. When the one-way valve plate 20 is closed, one end of the one-way valve plate 20 presses against the stop rod 30 and moves the inclined guide surface 34 against the inclined guide block 31, and pushes the piston block 22 to move squarely toward the liquid hole 19. This causes the piston block 22 to block the liquid hole 18, thereby blocking the connection between the liquid hole 18 and the liquid hole 19, preventing coolant from entering the cavity 14 when the compressor is turned off, which would cause parts such as the screw 3 to rust. A reset block 32 is also welded on the inner wall of the gas pipe 11. A tension spring 33 is provided between the reset block 32 and the stop rod 30, so that the stop rod 30 and the inclined guide block 31 are separated during the operation of the compressor, thereby reducing the wear between the stop block and the inclined guide block 31 and increasing their service life.

[0032] Of course, the above are just typical examples of the present invention. In addition, the present invention may have many other specific embodiments. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention.

Claims

1. An internal exhaust process for a screw-type process gas compressor, characterized in that: internal... The exhaust process mainly includes the following steps: S1: Pre-start procedure: Power on the compressor and its control box; S2: Open exhaust gas outlet: Control the exhaust gas valve to open; S3: Open nitrogen inlet: Control the opening of the nitrogen valve to allow nitrogen to enter the compressor; S4: Compressed nitrogen: Nitrogen is compressed by the compressor and enters the gas-liquid separator (6) to replace the exhaust gas in the compressor and the gas-liquid separator (6), and nitrogen is discharged through the exhaust outlet. S5: Close nitrogen inlet: Control the nitrogen valve to close and stop nitrogen input; S6: Open the process gas inlet: Control the process gas inlet valve to open and replace the nitrogen in the compressor and gas-liquid separator (6) with process gas; S7: Detection: Detect the gas concentration at the exhaust outlet through the gas sampling port; S8: Close the exhaust gas outlet: When the gas concentration at the gas sampling monitoring port in S7 meets the standard, close the exhaust gas outlet valve; S9: Open the outlet: Control the outlet valve to open and allow process gas to be discharged; S10: Pre-shutdown treatment: Control the opening of the waste gas outlet valve to divert process gas; S11: Replace process gas: Close the outlet valve and the process gas inlet valve, and at the same time open the nitrogen inlet valve. Replace the process gas in the compressor and gas-liquid separator (6) with nitrogen and discharge it from the exhaust outlet. S12： Shutdown: Close all valves on the compressor and disconnect the power; The screw-type process gas compressor used in the internal exhaust process includes a compression chamber (1) and a drive motor (2). The compression chamber (1) is provided with an air inlet (4) and an air outlet (5) at both ends. The compressor is also provided with a gas-liquid separator (6) and a radiator (7) at the side. The gas-liquid separator (6) is provided with an air inlet (8) and an air outlet (9) at both ends. A gas pipe (11) is connected between the air outlet (5) and the air inlet (8). A return pipe (12) is connected between the radiator (7) and the compression chamber (1). The radiator (7) drives the coolant into the compression chamber (1). The compression chamber (1) has a cavity (14) inside, a screw (3) is installed in the cavity (14), an injection hole (15) is opened on the inner side wall of the cavity (14), the return pipe (12) is connected to the injection hole (15), and a flow control device (16) is also installed in the inner side wall of the cavity (14) to control the flow rate of coolant entering the cavity (14); The injection hole (15) includes a piston chamber (17), a liquid hole one (18) and a liquid hole two (19). The piston chamber (17) is opened on the inner wall of the air outlet one (5). The liquid hole one (18) and the liquid hole two (19) are both connected to the piston chamber (17). The flow control device (16) includes a piston block (22) and an impeller (23). One end of the piston block (22) is set in the piston chamber (17) and is slidably connected to the piston chamber (17). The impeller (23) is rotatably connected to the inner wall of the air outlet one (5). A rocker arm (24) is also provided between the impeller (23) and the tail of the piston block (22). One end of the rocker arm (24) is eccentrically hinged to the end face of the impeller (23), and the other end is hinged to the tail of the piston block (22). The air pipe (11) is also hinged to a one-way valve plate (20) on the side near the air outlet (5). The one-way valve plate (20) is provided with a sealing rubber plate (27) and an elastic element. The elastic element drives the one-way valve plate (20) to close the air pipe (11). A square connecting pipe (25) is provided on the side of the air pipe (11) near the air outlet (5). One end of the square connecting pipe (25) is hinged to the one-way valve plate (20), and the other end is provided with a through groove (29). A push rod (30) is provided in the through groove (29). A inclined guide block (31) is also provided at the tail of the piston block (22). An inclined guide surface (34) is provided at the end of the push rod (30). When the one-way valve plate (20) is closed, one end of the one-way valve plate (20) presses against the push rod (30) and causes the inclined guide surface (34) to move against the inclined guide block (31), and pushes the piston block (22) toward the liquid hole (19) to block the communication between the liquid hole (18) and the liquid hole (19).

2. The internal exhaust process of the screw-type process gas compressor according to claim 1, characterized in that: A reset block (32) is also provided on the inner wall of the trachea (11). A tension spring (33) is provided between the reset block (32) and the push rod (30). The tension spring (33) is used to pull the push rod (30) upward and to disengage the inclined guide surface (34) from the inclined guide block (31).

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