Screw type two-stage pressurizing air compressor

Abstract

The utility model discloses a screw type two-stage supercharging air compressor which comprises a first-stage compression system, a drying machine and a second-stage compression system which are sequentially communicated through pipelines in the air circulation direction. The first-stage compression system comprises a first compression device, a first separation device and a first cooling device, and the second-stage compression system comprises a second compression device, a second separation device and a second cooling device. Air is subjected to primary compression and oil-gas separation through the first-stage compression system, then is subjected to secondary compression and oil-gas separation through the second-stage compression system after being subjected to moisture removal through the first water-vapor separator and the drying machine so as to form clean and dry high-pressure gas, the performance is stable, the compression process is reliable, and therefore the gas production quality and the gas production efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air compressors, in particular to a screw-type two-stage booster air compressor. Background Art

[0002] With the continuous development of industrial technology, air compressors are increasingly used in various fields. Screw air compressors are a type of positive displacement compressor. Air enters the housing between the teeth of the parallel meshing yin and yang rotors. During the rotation of the yin and yang rotors, the volume between the teeth is reduced to achieve the purpose of air compression. It has the advantages of compact structure, stable operation, and easy maintenance, and has become a mainstream product on the market.

[0003] The Chinese utility model authorization announcement is CN208268066U, which discloses a two-stage single-screw compressor unit for process gas compression, which includes a first-stage single-screw compressor, an intercooler, a second-stage single-screw compressor and a gas-water separator connected in sequence, and uses two output shafts of a motor to drive two independent compressor main engines respectively, and the water-gas mixture of the secondary compression is separated by the gas-water separator. Although the unit space is more compact and the cost is lower, the air is compressed by the first-stage single-screw compressor to form a water-gas mixture, and the mixed gas is compressed again by the second-stage single-screw compressor to generate high-pressure gas. After the two compressions, the high-pressure gas contains more water, and only a gas-water separator cannot completely separate the water in the compressed gas. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the utility model provides a screw-type two-stage booster air compressor. The air is initially compressed and oil-gas separated by a first-stage compression system, and the water is removed by a steam-water separator and a freeze dryer. Then, the air is compressed again and oil-gas separated by a second-stage compression system to form clean high-pressure gas. The utility model has a simple structure and a reliable compression process.

[0005] The utility model adopts a technical solution to solve the technical problem: to provide a screw-type two-stage booster air compressor, characterized in that: along the air flow direction, it includes a primary compression system, a dryer and a secondary compression system which are sequentially connected through a pipeline;

[0006] The primary compression system comprises a first compression device, a first separation device and a first cooling device, and the secondary compression system comprises a second compression device, a second separation device and a second cooling device;

[0007] The air is initially compressed by the first compression device and then transported to the first separation device through the first oil and gas pipeline for oil and gas separation. The separated lubricating oil is sent back to the first compression device through the first return pipeline. The separated low-pressure air is transported to the first cooling device through the first air pipeline A for cooling, and then transported to the dryer for drying through the first air pipeline B. The dried low-pressure air is transported to the second compression device through the docking pipeline for secondary compression, and then transported to the second separation device through the second oil and gas pipeline for oil and gas separation. The separated lubricating oil is sent back to the second compression device through the second return pipeline. The separated high-pressure air is transported to the second cooling device through the second air pipeline for cooling, and then transported to the back-end gas-using equipment through the high-pressure air output pipeline.

[0008] The first air duct B is provided with a first water vapor separator.

[0009] As a further improvement of the utility model, the first compression device includes a first main engine, a first air intake control valve and a first air filter connected to the air intake interface of the first main engine through a first air intake pipeline, and a first driving motor for driving the first main engine to rotate to achieve air compression;

[0010] The first separation device comprises a first separation barrel, in which an oil-gas separation core A, an oil-gas mixing chamber A and an oil containing chamber A are sequentially arranged from top to bottom, and the first separation barrel has an air outlet interface arranged at the top, an oil-gas mixing interface communicating with the oil-gas mixing chamber A, and an oil outlet interface communicating with the oil containing chamber A;

[0011] Both ends of the first oil and gas pipeline are respectively connected to the oil and gas mixing interfaces of the first host and the first separation barrel, and a first temperature sensor is provided on the first oil and gas pipeline;

[0012] Both ends of the first reflux pipeline are respectively connected to the oil inlet interface of the first main engine and the oil outlet interface of the first separation barrel.

[0013] As a further improvement of the present invention, the first cooling device includes a low-pressure cooler and a heat dissipation mechanism A for promoting heat dissipation of the low-pressure cooler.

[0014] The first reflux pipeline is provided with a three-way connector to form a first reflux branch A and a first reflux branch B, the two ends of the first reflux branch A are respectively connected to the lower interface of the three-way connector and the oil inlet interface of the first main engine, one end of the first reflux branch B is connected to the upper interface of the three-way connector, and the other end is connected to the first reflux branch A after passing through the oil inlet and oil outlet of the low-pressure cooler in sequence, and the first reflux pipeline A is provided with a low-pressure temperature control valve at the horizontal interface close to the three-way connector;

[0015] The two ends of the first air duct A are respectively connected to the air outlet interface on the first separation barrel and the air inlet interface of the low-pressure cooler, and the first air duct A is provided with a low-pressure pressure maintaining valve and a low-pressure pressure sensor in sequence along the air flow direction;

[0016] Both ends of the first air duct B are connected to the air outlet interface of the low-pressure cooler and the air inlet interface of the dryer respectively.

[0017] As a further improvement of the present invention, a first oil-gas separation oil return pipeline is connected to the top of the first separation barrel, one end of the first oil-gas separation oil return pipeline is connected to the oil-gas separation core oil return interface of the first host through a first oil return one-way valve, and the other end is connected to the oil-gas separation core A of the first separation barrel;

[0018] The first separation barrel further comprises a first sewage discharge pipe arranged at the bottom thereof, and an oil filling interface arranged at one side of the bottom. The first sewage discharge pipe is provided with a first one-way ball valve.

[0019] As a further improvement of the present invention, the second compression device includes a second main engine, an intake check valve connected to the intake interface of the second main engine through a second intake pipe and a second air filter, and a second drive motor for driving the second main engine to rotate to achieve air compression;

[0020] The air inlet interface of the second host is provided with a three-way connector to form two air inlets, and the second air inlet pipeline is connected to one of the air inlets of the second host;

[0021] One end of the docking pipe is connected to another air inlet of the second host, and the other end is connected to the air outlet interface of the dryer, and an air intake pressure maintaining valve is provided on the docking pipe.

[0022] As a further improvement of the present invention, the second separation device includes a second separation barrel, in which an oil-gas separation core B, an oil-gas mixing chamber B and an oil containing chamber B are sequentially arranged from top to bottom; and the second separation barrel has an air outlet interface arranged at the top thereof, an oil-gas mixing interface communicating with the oil-gas mixing chamber B, and an oil outlet interface communicating with the oil containing chamber B;

[0023] The two ends of the second oil and gas pipeline are respectively connected to the oil and gas mixing interfaces of the second main engine and the second separation barrel, and a second temperature sensor and an exhaust check valve are provided on the second oil and gas pipeline along the air circulation direction;

[0024] Both ends of the second reflux pipeline are respectively connected to the oil inlet interface of the second main engine and the oil outlet interface of the second separation barrel.

[0025] As a further improvement of the present invention, the second cooling device includes a high-pressure cooler and a heat dissipation mechanism B for promoting heat dissipation of the high-pressure cooler.

[0026] A three-way connector is provided on the second reflux pipeline to form a second reflux branch A and a second reflux branch B, the two ends of the second reflux branch A are respectively connected to the lower interface of the three-way connector and the oil inlet interface of the second main engine, one end of the second reflux branch B is connected to the upper interface of the three-way connector, and the other end is connected to the second reflux branch A after passing through the oil inlet and the oil outlet of the high-pressure cooler in sequence, and the second reflux pipeline A is provided with a high-pressure temperature control valve at one end close to the three-way connector;

[0027] The two ends of the second air pipeline are respectively connected to the air outlet interface of the second separation barrel and the air inlet interface of the high-pressure cooler, and the second air pipeline is provided with a high-pressure pressure maintaining valve and a high-pressure pressure sensor in sequence along the air flow direction;

[0028] One end of the high-pressure air output pipeline is connected to the air outlet of the high-pressure cooler, and the other end is connected to the air-using equipment.

[0029] As a further improvement of the present invention, a second oil-gas separation return oil pipeline is connected to the top of the second separation barrel, one end of the second oil-gas separation return oil pipeline is connected to the oil-gas separation core return oil interface of the second main engine through a second oil return one-way valve, and the other end is connected to the oil-gas separation core B of the second separation barrel;

[0030] The second separation barrel further comprises a second sewage discharge pipe arranged at the bottom thereof, and an oil filling interface arranged at one side of the bottom, and a second one-way ball valve is arranged on the second sewage discharge pipe.

[0031] As a further improvement of the present invention, the heat dissipation mechanism A and the heat dissipation mechanism B are heat dissipation fans respectively arranged beside the low-pressure cooler and the high-pressure cooler, or are cooling water circulation systems respectively connected to the low-pressure cooler and the high-pressure cooler.

[0032] As a further improvement of the utility model, it also includes a discharge system, the discharge system includes a first discharge pipeline provided at the top of the first separation barrel and communicated with the inner cavity thereof, a second discharge pipeline provided at the top of the second separation barrel and communicated with the inner cavity thereof, and a discharge solenoid valve for controlling the on-off of the first discharge pipeline and the second discharge pipeline, and a muffler is provided at the air outlet of the discharge solenoid valve;

[0033] A high-pressure vent valve is provided on the second discharge pipeline;

[0034] The first air duct A is connected to a third discharge pipeline on one side close to the air outlet of the low-pressure pressure maintaining valve, and the third discharge pipeline is provided with a low-pressure vent valve whose opening and closing is controlled by the discharge solenoid valve.

[0035] The beneficial effects of the utility model are as follows: the primary compression system and the secondary compression system are started simultaneously, linked and controlled, and the structure is simple; the air is initially compressed and separated from the oil and gas by the primary compression system, and the air is compressed again and separated from the oil and gas by the secondary compression system after the moisture is removed by the dryer to form clean high-pressure gas, with stable performance and reliable compression process, thereby improving the gas production quality and gas production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0037] Figure 2 This is a structural schematic diagram of the second embodiment of the utility model.

[0038] Combined with the accompanying drawings, the following description is given:

[0039] 1. Primary compression system; 11. First compression device; 111. First main engine; 112. First air intake control valve; 113. First air filter; 114. First drive motor; 12. First separation device; 121. Oil-gas separation core A; 122. Oil-gas mixing chamber A; 123. Oil containing chamber A; 124. First sewage pipe; 13. First cooling device; 131. Low-pressure cooler; 14. First oil-gas pipe; 141. First temperature sensor; 15. First return pipe; 151. First return branch A; 152, first return branch B; 153, low-pressure temperature control valve; 16, first air pipeline A; 161, low-pressure pressure maintaining valve; 162, low-pressure pressure sensor; 17, first air pipeline B; 171, first water vapor separator; 18, first oil-gas separation oil return pipeline; 181, first oil return check valve; 2, dryer; 3, two-stage compression system; 31, second compression device; 311, second main engine; 312, air intake check valve; 313, second air filter; 314 , second drive motor; 32, second separation device; 321, oil-gas separation core B; 322, oil-gas mixing chamber B; 323, oil containing chamber B; 324, second sewage pipe; 33, second cooling device; 331, high-pressure cooler; 34, second oil-gas pipeline; 341, second temperature sensor; 342, exhaust check valve; 35, second return pipeline; 351, second return branch A; 352, second return branch B; 353, high-pressure temperature control valve; 36, second air pipeline; 36 1. High-pressure pressure maintaining valve; 362. High-pressure pressure sensor; 37. High-pressure air output pipeline; 38. Second oil-gas separation return pipeline; 381. Second return oil check valve; 4. Docking pipeline; 41. Intake pressure maintaining valve; 5A. Cooling fan; 5B. Cooling water circulation system; 6. Discharge system; 61. First discharge pipeline; 62. Second discharge pipeline; 621. High-pressure vent valve; 63. Discharge solenoid valve; 64. Muffler; 65. Third discharge pipeline; 651. Low-pressure vent valve. DETAILED DESCRIPTION

[0040] A preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.

[0041] See also Figure 1 and 2 The utility model provides a screw-type two-stage booster air compressor, which includes a primary compression system 1, a dryer 2 and a secondary compression system 3 which are connected in sequence through pipelines along the air flow direction; the air is initially compressed and oil-gas separated by the primary compression system 1 to obtain low-pressure air, which is dried by the dryer 2 to remove moisture in the low-pressure air, and then compressed and oil-gas separated again by the secondary compression system 3 to obtain high-pressure gas suitable for equipment requiring high-pressure air.

[0042] See also Figure 1, the utility model provides embodiment 1.

[0043] The primary compression system 1 of the screw-type two-stage booster air compressor comprises a first air compression device 11, a first separation device 12 and a first cooling device 13, and the secondary compression system 3 comprises a second air compression device 31, a second separation device 32 and a second cooling device 33; wherein, after the air is preliminarily compressed by the first air compression device 11, it is transported to the first separation device 12 through the first oil and gas pipeline 14 for oil and gas separation, the separated lubricating oil is sent back to the first air compression device 11 through the first return pipeline 15, the separated low-pressure air is transported to the first cooling device 13 through the first air pipeline A16 for cooling, and then transported to the dryer 2 for drying through the first air pipeline B17, the dried low-pressure air is transported to the second air compression device 31 through the docking pipeline 4 for secondary compression, and then transported to the second separation device 32 through the second oil and gas pipeline 34 for oil and gas separation, the separated lubricating oil is sent back to the second air compression device 31 through the second return pipeline 35, the separated high-pressure air is transported to the second cooling device 33 through the second air pipeline 36 for cooling, and then transported to the rear-end gas-using equipment through the high-pressure air output pipeline 37.

[0044] Specifically, the first air compression device 11 includes a first main unit 111, a first air intake control valve 112 and a first air filter 113 connected to the air intake interface of the first main unit 111 through a first air intake pipe, and a first drive motor 114 for driving the first main unit 111 to rotate to achieve air compression. Among them, the first main unit 111 is the core of compressed air. The first drive motor 114 is connected to the first main unit 111 through a coupling D-004, so that the screw of the first main unit 111 rotates to compress the air. By setting the coupling gas D-004, the purpose of buffering, shock absorption and improving the dynamic performance of the shaft system can be achieved. A first-level air filter pressure difference switch P1 is installed on the first air filter 113. When the air filter pressure loss exceeds the setting, the customer is prompted to replace it in time to avoid losses.

[0045] The first separation device 12 includes a first separation barrel, which can supply oil to the first main engine and compress the air at the same time, and is provided with an oil-gas separation core A121, an oil-gas mixing chamber A122 and an oil accommodating chamber A123 from top to bottom, and the first separation barrel has an air outlet interface arranged at the top, an oil-gas mixing interface connected to the oil-gas mixing chamber A121, and an oil outlet interface connected to the oil accommodating chamber A123; the first separation barrel is also provided with a first-level system pressure sensor P3 and a low-pressure safety valve D-009, the first-level system pressure sensor P3 is used to detect the pressure in the barrel in real time, and when it exceeds the set value, it reminds to replace the oil-gas separation core A121 in time, and the low-pressure safety valve D-009 provides safety protection, thereby improving the safety of the system.

[0046] The two ends of the first oil and gas pipeline 14 are respectively connected to the oil and gas mixing interfaces of the first main engine 111 and the first separation barrel, and the first oil and gas pipeline 14 is provided with a first temperature sensor 141, that is, the oil and gas mixture compressed by the first main engine 111 enters the first separation barrel through the first oil and gas pipeline 14, and the oil and gas are separated by the oil and gas separation core A121. The oil sinks to the bottom of the first separation barrel by gravity, and the first one-way ball valve at the bottom is used to open or close the first sewage pipe 124 for maintenance or emptying the first separation barrel.

[0047] The first cooling device 13 includes a low-pressure cooler 131 and a heat dissipation fan 5A arranged beside the low-pressure cooler 131. The heat dissipation fan 5A takes away the heat on the surface of the low-pressure cooler 131 by continuously circulating air, maintaining the normal operating temperature of the compressor, thereby preventing the compressor from overheating and malfunctioning. The two ends of the first air duct A16 are respectively connected to the air outlet interface on the first separation barrel and the air inlet interface of the low-pressure cooler 131, and the first air duct A16 is sequentially provided with a low-pressure pressure maintaining valve 161 and a low-pressure pressure sensor 162 along the air circulation direction. The low-pressure pressure maintaining valve 161 is set to an opening pressure of 4.5 bar to protect the normal operation of the screw lubrication system of the first main engine 111.

[0048] The two ends of the first air duct B17 are respectively connected to the air outlet interface of the low-pressure cooler 131 and the air inlet interface of the dryer 2, and a water vapor separator 171 is provided on the first air duct B17. An automatic drain valve is installed on the water vapor separator. When the set value is reached, the water remaining in the water vapor separator 171 is drained, and the compressed air after the water vapor separation enters the dryer 2. The dryer 2 adopts a refrigerated dryer. The refrigerated dryer uses the expansion and vaporization of the refrigerant to reduce the air temperature. The water in the air condenses into water droplets and settles down, so that the air becomes dry and the water content is greatly reduced.

[0049] In addition, in order to realize the recycling of lubricating oil and save energy, a three-way connector is provided on the first reflux pipe 15 to form a first reflux branch A151 and a first reflux branch B152. The two ends of the first reflux branch A151 are respectively connected to the lower interface of the three-way connector and the oil inlet interface of the first main engine 111. The first reflux branch A151 is also provided with a water vapor separator D-016 to separate water from the oil, and a valve P4 is provided on it to control its switch to drain water. One end of the first reflux branch B152 is connected to the upper interface of the three-way connector, and the other end is connected to the first reflux branch A151 after passing through the oil inlet and oil outlet of the low-pressure cooler 131 in sequence. The first reflux pipe A15 is provided with a low-pressure temperature control valve 153 at the horizontal interface close to the three-way connector. The proportion of lubricating oil entering the cooler is controlled by the low-pressure temperature control valve 153, thereby ensuring that the exhaust temperature of the compressor is within the set range, and the oil temperature returning to the first main engine remains constant, thereby extending the use of the oil.

[0050] The top of the first separation barrel is connected with a first oil-gas separation oil return pipeline 18, one end of which is connected to the oil-gas separation core oil return interface of the first main engine 111 through a first oil return one-way valve 181, and the other end is connected to the oil-gas separation core A121 of the first separation barrel. The first oil return one-way valve 181 is used to promptly suck out the lubricating oil remaining at the bottom of the oil-gas separation core A121 to meet the oil content of the first compressed air outlet below 3ppm, and at the same time prevent the oil and gas from flowing back to the first main engine during shutdown, causing an increase in the amount of oil in the main engine, resulting in difficulty in starting.

[0051] Furthermore, the second air compression device 31 includes a second host 311, an intake one-way valve 312 and a second air filter 313 connected to the intake interface of the second host 311 through a second intake pipe, and a second drive motor 314 connected to the second host 311 through a coupling D-022; the intake interface of the second host 311 is provided with a three-way connector to form two air inlets, and the second intake pipe is connected to one of the air inlets of the second host 311; one end of the docking pipe 4 is connected to the other air inlet of the second host 311, and the other end is connected to the air outlet interface of the dryer 2, and a precision filter D-019 and a first-level intake pressure maintaining valve 41 are provided on the docking pipe 4 along the air circulation direction, and the opening pressure of the intake pressure maintaining valve 41 is 2bar-2.2bar, and a second-level intake temperature sensor T2 and a second-level intake pressure sensor P5 are installed on the second intake pipe to monitor the intake temperature and pressure in real time. The low-pressure air dried by dryer 2 can filter out a large amount of liquid when passing through the precision filter D-019, reaching a minimum residual oil content of only 5ppm. An automatic drain valve is installed on it to drain the water and impurities remaining in the precision filter D-019 when the set value is reached.

[0052] The purpose of setting two air inlets is that when the primary compression system is just started, the internal pressure is not established in the docking pipe 4, and the set exhaust pressure cannot enter the secondary compression system. At this time, the secondary compression system replenishes air from the second air inlet pipe. When the primary compression system reaches the set exhaust pressure, the second air inlet pipe is closed and the air replenishment operation is stopped to ensure the simultaneous startup and startup control of the hosts of the primary compression system and the secondary compression system.

[0053] Furthermore, the second separation device 32 includes a second separation barrel, in which an oil-gas separation core B321, an oil-gas mixing chamber B322 and an oil accommodating chamber B323 are arranged in sequence from top to bottom; and the second separation barrel has an air outlet interface arranged on its top, an oil-gas mixing interface connected to the oil-gas mixing chamber B322, and an oil outlet interface connected to the oil accommodating chamber B323; both ends of the second oil and gas pipeline 34 are respectively connected to the second main engine 311 and the oil and gas mixing interface of the second separation barrel, and a second temperature sensor 341 and an exhaust check valve 342 are provided on the second oil and gas pipeline 34 along the air circulation direction.

[0054] The top of the second separation barrel is connected to a second oil-gas separation return oil pipeline 38, one end of the second oil-gas separation return oil pipeline 38 is connected to the oil-gas separation core return oil interface of the second main engine 311 through a second return oil one-way valve 381, and the other end is connected to the oil-gas separation core B321 of the second separation barrel; the second separation barrel also includes a second sewage pipe 324 arranged at the bottom thereof, and an oil filling interface arranged on one side of the bottom, and a second one-way ball valve is arranged on the second sewage pipe 324, on which a high-pressure safety valve D-032 and a secondary system pressure sensor P7 are also arranged.

[0055] The second cooling device 33 includes a high-pressure cooler 331 and a heat dissipation fan 5A arranged beside the high-pressure cooler 331. A three-way connector is arranged on the second return pipe 35 to form a second return branch A351 and a second return branch B352. The two ends of the second return branch A351 are respectively connected to the lower interface of the three-way connector and the oil inlet interface of the second main engine 311. A water vapor separator D-029 is also arranged on the second return branch A351 to separate water vapor in the oil, and a valve P8 is arranged on it to control its switch to drain water. One end of the second return branch B352 is connected to the upper interface of the three-way connector, and the other end is connected to the second return branch A351 after passing through the oil inlet and oil outlet of the high-pressure cooler 331 in sequence. The second return pipe A315 is provided with a high-pressure temperature control valve 353 at one end close to the three-way connector.

[0056] The two ends of the second air pipe 36 are respectively connected to the air outlet interface of the second separation barrel and the air inlet interface of the high-pressure cooler 331, and the second air pipe 36 is provided with a high-pressure pressure maintaining valve 361 and a high-pressure pressure sensor 362 in sequence along the air circulation direction; one end of the high-pressure air output pipe 37 is connected to the air outlet of the high-pressure cooler 331, and the other end is connected to the gas-using equipment.

[0057] Furthermore, the screw-type two-stage booster air compressor is also provided with a discharge system 6, which includes a first discharge pipeline 61 arranged at the top of the first separation barrel and connected to its inner cavity, a second discharge pipeline 62 arranged at the top of the second separation barrel and connected to its inner cavity, and a discharge solenoid valve 63 for controlling the opening and closing of the first discharge pipeline 61 and the second discharge pipeline 62, and a muffler 64 is provided at the air outlet of the discharge solenoid valve 63; a high-pressure vent valve 621 is provided on the second discharge pipeline 62; the first air duct A16 is connected to a third discharge pipeline 65 on the side of the air outlet close to the low-pressure pressure maintaining valve 161, and the third discharge pipeline 65 is provided with a low-pressure vent valve 651 whose opening and closing is controlled by the discharge solenoid valve 63. When the screw-type two-stage booster air compressor is shut down, the high-pressure vent valve 621 and the low-pressure vent valve 651 are opened or closed by the discharge solenoid valve 63 to vent the gas in the first air pipe A16 at the rear end of the low-pressure pressure maintaining valve 161 and the first separation barrel and the second separation barrel until the pressure is zero, so as to avoid harm to the human body caused by high-pressure gas when maintaining the system.

[0058] See also Figure 2 , Embodiment 2 provided by the present utility model.

[0059] The difference between this embodiment and the first embodiment is that the heat dissipation mechanism A and the heat dissipation mechanism B are respectively connected to the cooling water circulation system 5B of the low-pressure cooler 131 and the high-pressure cooler 331 .

[0060] The cooling water circulation system 5B specifically includes a first water inlet pipe 5B1 connected to the water inlet of the low-pressure cooler, a first water outlet pipe 5B2 connected to the water outlet, a second water inlet pipe 5B3 connected to the water inlet of the high-pressure cooler, and a second water outlet pipe 5B4 connected to the water outlet.

[0061] The first water inlet pipe 5B1 and the second water inlet pipe 5B3 are connected to the main water inlet pipe, on which a water inlet pressure sensor P9 and a water inlet temperature sensor T4 are provided; the first water outlet pipe 5B2 and the second water outlet pipe 5B4 are connected to the main water outlet pipe, on which a water outlet pressure sensor P10 and a water outlet temperature sensor T5 are provided. The cooling water circulates in the cooler to remove the high temperature of the cooler, thereby ensuring the stable operation of the equipment.

[0062] In summary, the screw-type two-stage booster air compressor provided by the utility model has a primary compression system and a secondary compression system that are started simultaneously and controlled in linkage, and has a simple structure; the air is initially compressed and separated from oil and gas by the primary compression system, and after the moisture is removed by the first water vapor separator and the dryer, it is compressed again and separated from oil and gas by the secondary compression system to form clean and dry high-pressure gas, with stable performance and reliable compression process, thereby improving the gas production quality and gas production efficiency.

[0063] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A screw type two-stage booster air compressor, characterized in that: Along the air flow direction, it includes a primary compression system (1), a dryer (2) and a secondary compression system (3) which are sequentially connected through pipelines; The primary compression system (1) comprises a first compression device (11), a first separation device (12) and a first cooling device (13); the secondary compression system (3) comprises a second compression device (31), a second separation device (32) and a second cooling device (33); wherein the air is initially compressed by the first compression device (11) and then transported to the first separation device (12) through the first oil and gas pipeline (14) for oil and gas separation; the separated lubricating oil is returned to the first compression device (11) through the first return pipeline (15); the separated low-pressure air is transported to the first cooling device (13) through the first air pipeline A (16) for cooling; and then transported to the dryer (2) through the first air pipeline B (17) for drying; the dried low-pressure air is transported to the second compression device (31) through the docking pipeline (4) for secondary compression; and then transported to the second separation device (32) through the second oil and gas pipeline (34) for oil and gas separation; the separated lubricating oil is returned to the second compression device (31) through the second return pipeline (35); the separated high-pressure air is transported to the second cooling device (33) through the second air pipeline (36) for cooling; and then transported to the rear-end gas-using equipment through the high-pressure air output pipeline (37); The first air duct B (17) is provided with a first water vapor separator (171).

2. The screw-type two-stage booster air compressor according to claim 1, characterized in that: The first compression device (11) comprises a first main engine (111), a first air intake control valve (112) and a first air filter (113) connected to an air intake interface of the first main engine (111) via a first air intake pipeline, and a first drive motor (114) for driving the first main engine (111) to rotate to achieve air compression; The first separation device (12) comprises a first separation barrel, wherein an oil-gas separation core A (121), an oil-gas mixing chamber A (122) and an oil containing chamber A (123) are arranged in order from top to bottom in the first separation barrel, and the first separation barrel has an air outlet interface arranged at the top, an oil-gas mixing interface communicating with the oil-gas mixing chamber A (122), and an oil outlet interface communicating with the oil containing chamber A (123); Both ends of the first oil and gas pipeline (14) are respectively connected to the oil and gas mixing interface of the first main engine (111) and the first separation barrel, and a first temperature sensor (141) is provided on the first oil and gas pipeline (14); Both ends of the first return pipe (15) are respectively connected to the oil inlet interface of the first main machine (111) and the oil outlet interface of the first separation barrel.

3. The screw-type two-stage booster air compressor according to claim 2, characterized in that: The first cooling device (13) comprises a low-pressure cooler (131) and a heat dissipation mechanism A for promoting heat dissipation of the low-pressure cooler (131). The first return pipe (15) is provided with a three-way connector to form a first return branch A (151) and a first return branch B (152); the two ends of the first return branch A (151) are respectively connected to the lower interface of the three-way connector and the oil inlet interface of the first main engine (111); one end of the first return branch B (152) is connected to the upper interface of the three-way connector, and the other end is connected to the first return branch A (151) after passing through the oil inlet and the oil outlet of the low-pressure cooler (131) in sequence; the first return pipe (15) is provided with a low-pressure temperature control valve (153) at a horizontal interface close to the three-way connector; The two ends of the first air duct A (16) are respectively connected to the air outlet interface on the first separation barrel and the air inlet interface of the low-pressure cooler (131), and the first air duct A (16) is provided with a low-pressure pressure maintaining valve (161) and a low-pressure pressure sensor (162) in sequence along the air flow direction; Both ends of the first air duct B (17) are respectively connected to the air outlet interface of the low-pressure cooler (131) and the air inlet interface of the dryer (2).

4. The screw-type two-stage booster air compressor according to claim 3, characterized in that: A first oil-gas separation oil return pipeline (18) is connected to the top of the first separation barrel; one end of the first oil-gas separation oil return pipeline (18) is connected to the oil-gas separation core oil return interface of the first main engine (111) via a first oil return one-way valve (181), and the other end is connected to the oil-gas separation core A (121) of the first separation barrel; The first separation barrel further comprises a first sewage discharge pipe (124) arranged at the bottom thereof, and an oil injection interface arranged at one side of the bottom; the first sewage discharge pipe (124) is provided with a first one-way ball valve.

5. The screw-type two-stage booster air compressor according to claim 4, characterized in that: The second compression device (31) comprises a second main engine (311), an intake check valve (312) and a second air filter (313) connected to an intake interface of the second main engine (311) via a second intake pipe, and a second drive motor (314) for driving the second main engine (311) to rotate to achieve air compression; The air inlet interface of the second main unit (311) is provided with a three-way connector to form two air inlets, and the second air inlet pipeline is connected to one of the air inlets of the second main unit (311); One end of the docking pipe (4) is connected to another air inlet of the second main machine (311), and the other end is connected to an air outlet interface of the dryer (2), and an air intake pressure maintaining valve (41) is provided on the docking pipe (4).

6. The screw-type two-stage booster air compressor according to claim 5, characterized in that: The second separation device (32) comprises a second separation barrel, in which an oil-gas separation core B (321), an oil-gas mixing chamber B (322) and an oil containing chamber B (323) are arranged in order from top to bottom; and the second separation barrel has an air outlet interface arranged at the top thereof, an oil-gas mixing interface communicating with the oil-gas mixing chamber B (322), and an oil outlet interface communicating with the oil containing chamber B (323); The two ends of the second oil and gas pipeline (34) are respectively connected to the oil and gas mixing interface of the second main engine (311) and the second separation barrel, and a second temperature sensor (341) and an exhaust check valve (342) are provided on the second oil and gas pipeline (34) along the air circulation direction; Both ends of the second return pipe (35) are respectively connected to the oil inlet interface of the second main engine (311) and the oil outlet interface of the second separation barrel.

7. The screw-type two-stage booster air compressor according to claim 6, characterized in that: The second cooling device (33) comprises a high-pressure cooler (331) and a heat dissipation mechanism B for promoting heat dissipation of the high-pressure cooler (331). The second return pipe (35) is provided with a three-way connector to form a second return branch A (351) and a second return branch B (352); the two ends of the second return branch A (351) are respectively connected to the lower interface of the three-way connector and the oil inlet interface of the second main engine (311); one end of the second return branch B (352) is connected to the upper interface of the three-way connector, and the other end is connected to the second return branch A (351) after passing through the oil inlet and the oil outlet of the high-pressure cooler (331) in sequence; the second return pipe A (315) is provided with a high-pressure temperature control valve (353) at one end close to the three-way connector; The two ends of the second air pipeline (36) are respectively connected to the air outlet interface of the second separation barrel and the air inlet interface of the high-pressure cooler (331), and the second air pipeline (36) is provided with a high-pressure pressure maintaining valve (361) and a high-pressure pressure sensor (362) in sequence along the air circulation direction; One end of the high-pressure air output pipeline (37) is connected to the air outlet of the high-pressure cooler (331), and the other end is connected to the air-consuming equipment.

8. The screw-type two-stage booster air compressor according to claim 7, characterized in that: A second oil-gas separation oil return pipeline (38) is connected to the top of the second separation barrel; one end of the second oil-gas separation oil return pipeline (38) is connected to the oil-gas separation core oil return interface of the second main engine (311) via a second oil return one-way valve (381), and the other end is connected to the oil-gas separation core B (321) of the second separation barrel; The second separation barrel further comprises a second sewage discharge pipe (324) arranged at the bottom thereof, and an oil injection interface arranged at one side of the bottom; the second sewage discharge pipe (324) is provided with a second one-way ball valve.

9. The screw-type two-stage booster air compressor according to claim 8, characterized in that: The heat dissipation mechanism A and the heat dissipation mechanism B are heat dissipation fans (5A) respectively arranged beside the low-pressure cooler (131) and the high-pressure cooler (331), or are cooling water circulation systems (5B) respectively connected to the low-pressure cooler (131) and the high-pressure cooler (331).

10. The screw-type two-stage booster air compressor according to claim 8, characterized in that: The device further comprises a discharge system (6), the discharge system (6) comprising a first discharge pipeline (61) provided at the top of the first separation barrel and in communication with the inner cavity thereof, a second discharge pipeline (62) provided at the top of the second separation barrel and in communication with the inner cavity thereof, and a discharge solenoid valve (63) for controlling the on-off of the first discharge pipeline (61) and the second discharge pipeline (62), wherein a muffler (64) is provided at the gas outlet of the discharge solenoid valve (63); The second discharge pipeline (62) is provided with a high-pressure discharge valve (621); The first air duct A (16) is connected to a third discharge pipeline (65) at a side of the air outlet close to the low-pressure pressure maintaining valve (161), and the third discharge pipeline (65) is provided with a low-pressure vent valve (651) whose opening and closing is controlled by the discharge solenoid valve (63).

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