A screw and piston series air compressor system

Abstract

This utility model relates to the field of medium and high pressure air compressor technology, and discloses a screw and piston series air compressor system, including a base on which a piston air compressor, a dual-output shaft variable frequency motor, and a screw air compressor are sequentially mounted. The dual-output shaft variable frequency motor simultaneously drives the crankshaft of the piston air compressor and the rotor of the screw air compressor. The screw air compressor has an air filter, an intake valve group, and a screw cylinder at its inlet end, and an oil-gas separator at its exhaust end. The oil-gas separator, oil-gas tank, and screw air compressor form a lubricating oil circulation. The piston air compressor adopts a four-stage compression structure, consisting of a piston cylinder, an air-water separator, an intercooler, and an exhaust tank connected sequentially. The first-stage compression structure is connected to the exhaust port of the oil-gas separator, and each stage of the compression structure is connected through a medium-pressure pipeline. This utility model combines screw and piston air compressors, improves compression efficiency through multi-stage compression, meets medium and high pressure requirements, and is suitable for various industrial scenarios.

Description

Technical Field

[0001] This utility model relates to the field of medium and high pressure air compressor technology, and in particular to a screw and piston series air compressor system. Background Technology

[0002] An air compressor is a device that compresses atmospheric air into high-pressure gas through mechanical work. It is widely used in industrial production, energy, chemical, and medical fields to provide power sources and transport gas. Commonly used air compressors include reciprocating air compressors, screw air compressors, centrifugal compressors, vane air compressors, and scroll air compressors. Reciprocating air compressors compress gas through the reciprocating motion of a piston, while screw air compressors compress gas by using meshing twin screw rotors to reduce the volume required for gas compression.

[0003] Chinese utility model patent CN218787869 U discloses a screw-piston composite medium-high pressure air compressor. The screw air compressor first pressurizes the gas, and the output gas, after passing through an oil-gas filter and a pressure stabilizing cylinder, directly enters the piston air compressor for a second pressurization, ultimately reaching a pressure of over 10 MPa. However, its pressure control strategy only achieves a simple two-stage pressurization, failing to solve the problem of precise pressure regulation under different operating conditions, and thus cannot meet the needs of some high-precision production processes. Utility Model Content

[0004] The purpose of this invention is to provide a screw and piston series air compressor system with multi-stage compression and precise pressure regulation.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a screw and piston series air compressor system, including a base, on which a piston air compressor, a dual-output shaft variable frequency motor and a screw air compressor are sequentially fixed. The dual-output shaft variable frequency motor is connected to the crankshaft of the piston air compressor and the rotor of the screw air compressor respectively. The air inlet end of the screw air compressor is provided with an air filter, an intake valve group and a screw cylinder from top to bottom. The exhaust end of the screw air compressor is connected to an oil-gas separator. An oil-gas tank is fixedly installed at one end of the base near the screw air compressor. The oil outlet of the oil-gas separator is connected to the oil-gas tank through a return oil pipeline. The oil-gas tank is connected to the bearing of the screw air compressor through a lubricating oil pump. The exhaust port of the oil-gas separator is connected to the air inlet of the piston air compressor through a medium-pressure pipeline. The piston air compressor includes a multi-stage series piston compression mechanism. An air storage tank is fixedly installed at one end of the base near the piston air compressor. The exhaust port of the piston air compressor is connected to the air storage tank through a high-pressure pipeline.

[0006] By adopting the above technical solution, the dual-output shaft variable frequency motor drives the crankshaft of the piston air compressor and the rotor of the screw air compressor to rotate. Air passes through the air filter and intake valve group of the screw air compressor and enters the screw cylinder to be compressed. The compressed gas enters the oil-gas separator for oil-gas separation. The separated oil returns to the oil-gas tank through the return oil pipeline, while the gas separated by the oil-gas separator enters the piston air compressor through the medium pressure pipeline for further compression. Finally, the high-pressure gas is transported to the air storage tank through the high-pressure pipeline from the exhaust port of the piston air compressor.

[0007] The present invention is further configured such that: the piston air compressor is a four-stage compression structure, the compression structure includes a piston cylinder, an air-water separator, an intercooler and a piston exhaust tank connected in sequence, the piston cylinder of the first stage compression structure is connected to the exhaust port of the oil-gas separator, the piston exhaust tank and the piston cylinder between adjacent compression structures are connected by a medium-pressure pipeline, and the piston exhaust tank of the last stage compression structure is an air storage tank.

[0008] By adopting the above technical solution, the piston air compressor uses a four-stage compression structure, so that the gas passes through four stages of compression in sequence, gradually increasing the pressure.

[0009] A further feature of this invention is that both the screw exhaust tank and the exhaust tank of the compression structure are equipped with pressure sensors and temperature sensors. An electrical control cabinet is also fixedly installed on the base, and a PLC is configured inside the electrical control cabinet. The PLC is connected to the pressure sensor signal.

[0010] By adopting the above technical solution, the PLC adjusts the opening of the screw air compressor's intake valve to control the intake volume based on the real-time air pressure value transmitted by the pressure sensor, and adjusts the load rate of each stage of the piston air compressor's cylinders, thereby achieving precise control of the output pressure of the entire air compressor system.

[0011] A further feature of this invention is that the intercooler is a shell-and-tube heat exchanger, the heat exchange tubes are made of copper, and the outlet temperature of the intercooler is controlled within the range of 35-40℃.

[0012] By adopting the above technical solution, when the high-temperature compressed gas flows in the tube side and the cooling medium flows in the shell side, the two exchange heat through the tube wall, thereby reducing the temperature of the compressed gas.

[0013] A further feature of this invention is that a wastewater tank is fixedly connected to the upper end of the screw air compressor, and the drain outlets of the air-water separator are all connected to the wastewater tank.

[0014] By adopting the above technical solution, the gas-water separator discharges the separated wastewater into a wastewater tank, thereby achieving centralized collection and treatment of wastewater.

[0015] A further feature of this invention is that the electrical control cabinet is also equipped with a touch screen display and status indicator lights. The touch screen display is used to display the measured values ​​of the pressure sensor and temperature sensor in real time, and the status indicator lights are used to display fault alarms.

[0016] By adopting the above technical solution, operators can intuitively understand the system's operating status through the touch screen, and the status indicator lights will display corresponding alarms according to the system's fault conditions.

[0017] A further feature of this invention is that a lifting structure is provided at each of the four corners of the base, and the lifting structure is a ring-shaped lifting lug.

[0018] By adopting the above technical solution, and by setting annular lifting lugs at the four corners of the base, the lifting rope can be passed through the annular lifting lugs, and the air compressor system can be lifted and moved to the designated position using lifting equipment.

[0019] The beneficial effects of this utility model are:

[0020] 1. The piston air compressor of this utility model has a four-stage compression structure. Compared with single-stage compression, it can increase the output pressure while reducing energy consumption and equipment wear, and improve the safety and stability of the entire air compressor system.

[0021] 2. The piston air compressor of this utility model is equipped with a shell and tube heat exchanger to control the temperature within a suitable range, which is beneficial to improve compression efficiency, reduce gas loss in subsequent compression processes, and also reduce the risk of equipment failure due to high temperature.

[0022] 3. The electrical control cabinet of this utility model is equipped with a touch screen and status indicator lights, which makes it convenient for operators to monitor the system operation status in real time, detect problems in time and take corresponding measures, thereby improving the operability and maintenance convenience of the equipment.

[0023] 4. The air compressor base of this utility model is equipped with a hoisting structure, which facilitates the handling, installation and maintenance of the air compressor system, and improves the mobility and installation efficiency of the equipment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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.

[0025] Figure 1 This is a schematic diagram of the overall structure of a screw and piston series air compressor system according to this utility model.

[0026] Figure 2This is a schematic diagram of the screw air compressor structure of a screw and piston series air compressor system according to this utility model.

[0027] Figure 3 This is a schematic diagram of the piston air compressor structure of a screw and piston series air compressor system according to this utility model.

[0028] In the diagram: 1. Dual-output shaft variable frequency motor; 2. Screw air compressor; 21. Air filter; 22. Intake valve assembly; 23. Screw cylinder; 24. Oil-gas separator; 25. Screw exhaust canister; 3. Piston air compressor; 31. Piston cylinder; 32. Air-water separator; 33. Intercooler; 34. Piston exhaust canister; 4. Oil-gas separator; 5. Air storage tank; 6. Wastewater tank; 7. Base; 71. Lifting structure; 8. Electrical control cabinet; 9. Touch screen display; 10. Status indicator light. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0030] An example is a screw and piston series air compressor system, such as... Figures 1-3As shown, the system includes a base 7, on which a piston air compressor 3, a dual-output shaft variable frequency motor 1, and a screw air compressor 2 are sequentially fixed. The dual-output shaft variable frequency motor 1 is connected to the crankshaft of the piston air compressor 3 and the rotor of the screw air compressor 2, respectively. From top to bottom, the intake end of the screw air compressor 2 is equipped with an air filter 21, an intake valve group 22, and a screw cylinder 23. The exhaust end of the screw air compressor 2 is connected to an oil-gas separator 24. An oil-gas tank 4 is fixedly installed at the end of the base 7 near the screw air compressor 2. The oil outlet of the oil-gas separator 24 is connected to the oil-gas tank 4 via a return oil pipeline. The oil-gas tank 4 is connected to the bearing of the screw air compressor 2 via a lubricating oil pump. The exhaust port of the oil-gas separator 24 is connected to the intake port of the piston air compressor 3 via a medium-pressure pipeline. The piston air compressor 3 includes multiple stages of piston compressors connected in series. The compressor has a four-stage compression structure. The compression structure includes a piston cylinder 31, an air-water separator 32, an intercooler 33, and a piston exhaust tank 34 connected in sequence. The piston cylinder 31 of the first-stage compression structure is connected to the exhaust port of the oil-gas separator 24. The piston exhaust tank 34 and piston cylinder 31 of adjacent compression structures are connected through a medium-pressure pipeline. The piston exhaust tank 34 of the last-stage compression structure is the air storage tank 5. The screw exhaust tank 25 and the exhaust tank of the compression structure are equipped with pressure sensors and temperature sensors. An electrical control cabinet 8 is also fixedly installed on the base 7. The electrical control cabinet 8 is equipped with a PLC and the PLC is connected to the pressure sensor signal.

[0031] Its working principle is as follows: After impurities are removed by the air filter 21, the air enters the screw cylinder 23 through the intake valve assembly 22. The dual-output shaft variable frequency motor 1 drives the screw rotor to rotate, compressing the air to about 10 barg. The compressed gas mixes with the lubricating oil and enters the oil-gas separator 24. The separated lubricating oil returns to the oil-gas tank 4 through the return oil pipeline. The pure compressed gas enters the screw exhaust tank 25. The pressure sensor monitors the pressure of the screw exhaust tank 25 in real time. When it reaches 10 barg, the PLC controls the intake valve assembly 22 to reduce the opening or stop the screw air compressor 2 from working to avoid overpressure. Then, the 10 barg gas in the screw exhaust tank 25 enters the piston air compressor 3. The piston cylinder 31 in the first-stage compression structure compresses the air to about 10 barg through the reciprocating motion of the piston. At 17.8 barg, during the compression process, saturated water vapor in the gas condenses into water, forming wastewater with the lubricating oil. After separation by the gas-water separator 32, the wastewater is transported to the wastewater tank 6. The compressed gas enters the intercooler 33, where the temperature drops to 35-40℃. The cooled gas then enters the piston exhaust tank 34, where the pressure sensor monitors the pressure. Once the pressure reaches the target, the gas enters the second-stage compression structure. In the second-stage compression structure, the gas is compressed to 31.7 barg. In the third-stage compression structure, the gas is further compressed to 56.4 barg. After passing through the fourth-stage compression structure, pure 100 barg high-pressure gas is obtained and transported to the gas storage tank 5 through a high-pressure pipeline.

[0032] Specifically, the intercooler 33 adopts a shell-and-tube heat exchanger, and the heat exchange tubes are made of copper. The outlet temperature of the intercooler 33 is controlled within the range of 35-40℃. When the high-temperature compressed gas flows in the tube side and the cooling medium flows in the shell side, the two exchange heat through the tube wall, thereby reducing the temperature of the compressed gas.

[0033] Specifically, a sewage tank 6 is fixedly connected to the upper end of the screw air compressor 2, and the drain outlet of the air-water separator 32 is connected to the sewage tank 6. The air-water separator 32 discharges the separated sewage into the sewage tank 6 to achieve centralized collection and treatment of sewage.

[0034] Specifically, the electrical control cabinet 8 is also equipped with a touch screen display 9 and a status indicator light 10. The touch screen display 9 is used to display the measured values ​​of the pressure sensor and temperature sensor in real time, and the status indicator light 10 is used to display fault alarms. Operators can intuitively understand the system operation status through the touch screen display 9, and the status indicator light will display corresponding alarms according to the fault conditions of the system.

[0035] Specifically, the base 7 is provided with a lifting structure 71 at each of its four corners. The lifting structure 71 is a ring-shaped lifting lug. The lifting rope is passed through the ring-shaped lifting lug, and the air compressor system is lifted and moved to the designated position by the lifting equipment.

[0036] The above describes the basic principles, main features, and advantages of this utility model. Standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment adopt conventional models in the prior art, which will not be described in detail here.

[0037] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

Claims

1. A screw and piston series air compressor system, comprising a base (7), wherein a piston air compressor (3), a dual-output shaft variable frequency motor (1), and a screw air compressor (2) are sequentially fixedly mounted on the base (7), characterized in that: The dual-output shaft variable frequency motor (1) is connected to the crankshaft of the piston air compressor (3) and the rotor of the screw air compressor (2) respectively. The air intake end of the screw air compressor (2) is provided with an air filter (21), an intake valve group (22) and a screw cylinder (23) from top to bottom. The exhaust end of the screw air compressor (2) is connected to an oil-gas separator (24). An oil-gas tank (4) is fixedly installed on one end of the base (7) near the screw air compressor (2). The oil outlet of the oil-gas separator (24) is... The oil return line is connected to the oil-gas tank (4), and the oil-gas tank (4) is connected to the bearing of the screw air compressor (2) through the lubricating oil pump. The exhaust port of the oil-gas separator (24) is connected to the air inlet of the piston air compressor (3) through the medium pressure line. The piston air compressor (3) includes a multi-stage series piston compression mechanism. An air storage tank (5) is fixedly installed on the base (7) near the piston air compressor (3). The exhaust port of the piston air compressor (3) is connected to the air storage tank (5) through the high pressure line.

2. The screw and piston series air compressor system according to claim 1, characterized in that: The piston air compressor (3) is a four-stage compression structure. The compression structure includes a piston cylinder (31), an air-water separator (32), an intercooler (33), and a piston exhaust tank (34) connected in sequence. The piston cylinder (31) of the first-stage compression structure is connected to the exhaust port of the oil-gas separator (24). The piston exhaust tank (34) and piston cylinder (31) between two adjacent compression stages are connected by a medium-pressure pipeline. The piston exhaust tank (34) of the last-stage compression structure is an air storage tank (5).

3. The screw and piston series air compressor system according to claim 2, characterized in that: The screw exhaust tank (25) and the exhaust tank of the compression structure are both equipped with pressure sensors and temperature sensors. An electrical control cabinet (8) is also fixedly installed on the base (7). A PLC is configured in the electrical control cabinet (8), and the PLC is connected to the pressure sensor signal.

4. The screw and piston series air compressor system according to claim 2, characterized in that: The intermediate cooler (33) adopts a shell-and-tube heat exchanger, and the heat exchange tube is made of copper. The outlet temperature of the intermediate cooler (33) is controlled within the range of 35-40℃.

5. A screw and piston series air compressor system according to claim 2, characterized in that: The upper end of the screw air compressor (2) is fixedly connected to a sewage tank (6), and the drain outlet of the air-water separator (32) is connected to the sewage tank (6).

6. A screw and piston series air compressor system according to claim 3, characterized in that: The electrical control cabinet (8) is also equipped with a touch screen (9) and a status indicator (10). The touch screen (9) is used to display the measured values ​​of the pressure sensor and the temperature sensor in real time, and the status indicator (10) is used to display fault alarms.

7. The screw and piston series air compressor system according to claim 1, characterized in that: The base (7) is provided with a lifting structure (71) at each of its four corners. The lifting structure (71) is a ring-shaped lifting lug.

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