Screw air compressor with special oil way lubricating system

Abstract

The utility model discloses a screw air compressor with a special oil way lubrication system, which comprises a compressor body, an oil gas barrel, an air-cooled cooler and an auxiliary oil pump, the oil gas barrel is provided with an air inlet, an oil discharge port and an oil outlet, the air inlet is connected with the exhaust end of the compressor body, the oil discharge port is connected with the air-cooled cooler, and the auxiliary oil pump is connected with the air-cooled cooler. And an inlet and an outlet of the auxiliary oil pump are connected to the oil outlet and the compressor body respectively, so that lubricating oil in the oil gas barrel enters the compressor body through the auxiliary oil pump. The auxiliary oil pump is used for forcibly supplying oil to the bearing lubricating oil way, part abrasion is reduced, maintenance frequency and cost are reduced, and the service life of the screw air compressor is prolonged. Meanwhile, the medium-pressure screw compressor can reliably operate in a medium-pressure screw compressor system with the exhaust pressure of 2.0 MPa or above, and therefore many problems existing in the prior art are solved.

Description

Technical Field

[0001] This utility model relates to a screw air compressor with a special oil circuit lubrication system. Background Technology

[0002] Air compressors, as general-purpose machines that increase gas pressure by compressing air, are widely used in various industrial settings. Currently, the operating pressure range of commonly used screw air compressors is typically between 0.7 and 1.3 MPa. However, for products requiring a supply pressure above 2.0 MPa, reciprocating compressors or combined compressors using two single-screw compressors for pressurization are more commonly used. Reciprocating compressors suffer from piston ring wear, leading to a significant decrease in efficiency over time, high operating costs, and poor reliability. Using two single-screw compressors for pressurization results in a complex system that requires precise control of the operating parameters of both compressors to ensure load balance and prevent overloading of any single compressor. Furthermore, regular maintenance and repair of both compressors are necessary, resulting in higher maintenance costs.

[0003] For existing medium-pressure screw compressors with a gas supply pressure of 2.0 MPa or higher, in order to ensure the service life of the compressor main unit, the common practice is to increase the operating internal pressure of the compressor system to ensure sufficient oil inlet pressure for lubricating the machine bearings, or to use a compressor main unit with an integrated oil pump for forced lubrication. The disadvantages of the former are that the increased operating pressure requires higher pressure resistance of the components, which not only increases operating and material costs, but also increases mechanical wear of the main unit and shortens the service life of the equipment due to long-term high-pressure operation. While compressor main units with oil pumps have the advantage of forced lubrication, they also have high processing costs, high power consumption, and difficult installation and maintenance. In particular, the pressurization effect is poor when the unit is operating under changing conditions, which leads to a shortened service life of the machine. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings of existing products. This invention provides a screw air compressor with a special oil circuit lubrication system.

[0005] This utility model is achieved through the following technical solution:

[0006] A screw air compressor with a special oil circuit lubrication system includes a compressor body, an oil-gas separator, an air-cooled cooler, and an auxiliary oil pump. The oil-gas separator has an air inlet, an oil outlet, and an oil outlet. The air inlet is connected to the exhaust end of the compressor body, and the oil outlet is connected to the air-cooled cooler, so that the compressor body, the oil-gas separator, and the air-cooled cooler are sequentially connected. The inlet and outlet of the auxiliary oil pump are respectively connected to the oil outlet and the compressor body, so that the lubricating oil in the oil-gas separator enters the compressor body through the auxiliary oil pump.

[0007] Furthermore, the screw air compressor with a special oil circuit lubrication system also includes a temperature-controlled oil filter base, the two ends of which are respectively connected to the oil outlet and the inlet of the auxiliary oil pump, and are connected to the oil-gas tank and the auxiliary oil pump.

[0008] Furthermore, the temperature-controlled oil filter seat has an oil inlet, a cold oil outlet, and a hot oil outlet. The oil inlet is connected to the oil outlet, and the cold oil outlet is connected to the inlet of the auxiliary oil pump. The screw air compressor with a special oil circuit lubrication system also includes an oil cooler. The oil cooler has a heat source inlet and a heat source outlet. The heat source inlet is connected to the hot oil outlet, and the heat source outlet is connected to the inlet of the auxiliary oil pump.

[0009] Furthermore, the screw air compressor with a special oil circuit lubrication system also includes an oil filter, the two ends of which are respectively connected to the temperature-controlled oil filter holder and the auxiliary oil pump.

[0010] Furthermore, the auxiliary oil pump is a magnetically driven gear pump.

[0011] Furthermore, the screw air compressor with a special oil circuit lubrication system also includes a vacuum generator, the two ends of which are respectively connected to the shaft seal failure oil return port of the compressor body and the main air inlet of the compressor body, so that the lubricating oil leaking from the shaft seal failure oil return port is drawn into the main body of the compressor body.

[0012] Furthermore, the screw air compressor with a special oil circuit lubrication system also includes a pressure regulating valve, the two ends of which are respectively connected to the oil-gas tank and the vacuum generator.

[0013] Furthermore, the screw air compressor with a special oil circuit lubrication system also includes a one-way valve, the two ends of which are respectively connected to the exhaust end of the compressor body and the air inlet, and are connected to the compressor body and the oil-gas tank.

[0014] Furthermore, the screw air compressor with a special oil circuit lubrication system also includes an intake hose, which is connected to the intake end of the compressor body.

[0015] Furthermore, the screw air compressor with a special oil circuit lubrication system also includes an intake valve, the bottom of which is connected to the intake end of the compressor body, and the intake hose is sealed to the top of the intake valve.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention relates to a screw air compressor with a special oil circuit lubrication system. An auxiliary oil pump is connected to the oil outlet and compressor body via its inlet and outlet, respectively, allowing lubricating oil from the oil-gas separator to enter the compressor body through the auxiliary oil pump. This forced oil supply to the bearing lubrication circuit via the auxiliary oil pump reduces component wear, decreases maintenance frequency and costs, and extends the service life of the screw air compressor. Furthermore, it enables reliable operation in medium-pressure screw compressor systems with discharge pressures above 2.0 MPa, thus solving many problems existing in the prior art. Attached Figure Description

[0018] Figure 1 This is a front view schematic diagram of a screw air compressor with a special oil circuit lubrication system according to an embodiment of the present invention.

[0019] Figure 2 This is a top view of a screw air compressor with a special oil circuit lubrication system according to an embodiment of the present invention.

[0020] Figure 3 This is a side view of a screw air compressor with a special oil circuit lubrication system according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] Compressor body 1

[0023] Oil and gas tank 2

[0024] Air-cooled cooler 3

[0025] Auxiliary oil pump 4

[0026] Temperature-controlled oil filter holder 5

[0027] Oil filter 6

[0028] Oil Cooler 7

[0029] Vacuum generator 8

[0030] Pressure regulating valve 9

[0031] Intake hose 10

[0032] Intake valve 11

[0033] One-way valve 12 Detailed Implementation

[0034] The following description of the embodiments is with reference to the accompanying drawings, which illustrate specific embodiments in which the present invention can be implemented.

[0035] like Figure 1 , Figure 2 and Figure 3As shown, this embodiment discloses a screw air compressor with a special oil lubrication system. This screw air compressor includes a compressor body 1, an oil-gas separator 2, an air-cooled cooler 3, and an auxiliary oil pump 4. The oil-gas separator 2 has an air inlet, an oil outlet, and an oil outlet. The air inlet is connected to the exhaust end of the compressor body 1, and the oil outlet is connected to the air-cooled cooler 3, so that the compressor body 1, the oil-gas separator 2, and the air-cooled cooler 3 are sequentially connected. The compressor body 1 compresses the intake air. The compressed high-temperature air passes through the compressor body's exhaust pipe into the oil-gas separator 2. After the oil-gas mixture is separated by a cyclone separator, the gas passes through a connecting pipe into the air-cooled cooler 3. After being cooled by the air-cooled cooler 3, the gas is discharged to supply external equipment.

[0036] The inlet and outlet of the auxiliary oil pump 4 are connected to the oil outlet and the compressor body 1, respectively, so that the lubricating oil in the oil-gas separator 2 enters the compressor body 1 through the auxiliary oil pump 4. The auxiliary oil pump 4 provides forced oil supply to the compressor body 1, delivering the lubricating oil from the oil-gas separator 2 to various lubrication points of the compressor body 1 under pressure. This ensures sufficient lubrication of all moving parts under high load or high speed, guaranteeing adequate lubrication and preventing shutdowns or damage due to insufficient lubrication, thus ensuring continuous operation of the equipment. It also reduces component wear, decreases maintenance frequency and costs, and extends the service life of the screw air compressor. Furthermore, it enables reliable operation in medium-pressure screw compressor systems with discharge pressures above 2.0 MPa, thereby solving many problems existing in current technologies.

[0037] In this embodiment, the auxiliary oil pump 4 is a magnetically driven gear pump. The auxiliary oil pump 4 is a magnetically driven gear pump, which adopts a magnetic sealing method and has the advantages of no leakage, high temperature resistance, high reliability, low maintenance, and high energy efficiency. It also has the characteristics of low noise, long life and high safety, ensuring the normal operation of the entire system under high temperature and high pressure environment.

[0038] The screw air compressor with a special oil lubrication system also includes a one-way valve 12. The two ends of the one-way valve 12 are connected to the discharge end and the air inlet of the compressor body 1, respectively, and are connected to the compressor body 1 and the oil-gas tank 2. The discharge end of the compressor body 1 is connected to the oil-gas tank 2 through the one-way valve 12 and the compressor body's discharge pipe, preventing the pressure inside the oil-gas tank 2 from backflowing into the compressor body 1 when the compressor is stopped, thus avoiding damage to its internal parts and affecting its service life.

[0039] The compressor body 1 is driven by a permanent magnet variable frequency motor, enabling the screw rotor inside the compressor body 1 to rotate at high speed under the drive of the permanent magnet variable frequency motor. A pressure maintaining valve and a pressure maintaining valve outlet pipe are installed between the oil-gas tank 2 and the air-cooled cooler 3, so that the gas in the oil-gas tank 2 enters the air-cooled cooler 3 after passing through the pressure maintaining valve and the pressure maintaining valve outlet pipe. A pressure gauge is installed on the oil-gas tank 2 to detect the pressure inside the oil-gas tank 2.

[0040] The screw air compressor with a special oil lubrication system also includes a temperature-controlled oil filter 5. The two ends of the temperature-controlled oil filter 5 are connected to the oil outlet and the inlet of the auxiliary oil pump 4, respectively, and are connected to the oil-gas separator 2 and the auxiliary oil pump 4. The lubricating oil in the oil-gas separator 2 can enter the temperature-controlled oil filter 5, and after passing through the temperature-controlled oil filter 5, it flows sequentially into the auxiliary oil pump 4 and the compressor body 1. The temperature-controlled oil filter 5 can control the temperature of the lubricating oil, thereby controlling the temperature of the lubricating oil entering the compressor body 1 and ensuring the stable operation of the screw air compressor.

[0041] The temperature-controlled oil filter holder 5 has an oil inlet, a cold oil outlet, and a hot oil outlet. The oil inlet is connected to the oil outlet, and the cold oil outlet is connected to the inlet of the auxiliary oil pump 4. The screw air compressor with a special oil circuit lubrication system also includes an oil cooler 7, which has a heat source inlet and a heat source outlet. The heat source inlet is connected to the hot oil outlet, and the heat source outlet is connected to the inlet of the auxiliary oil pump 4. The lubricating oil in the oil-gas separator 2 enters the temperature-controlled oil filter holder 5 through the oil inlet. The temperature-controlled oil filter holder 5 causes the cold oil to enter the auxiliary oil pump 4 through the cold oil outlet. After being pressurized by the auxiliary oil pump 4, the oil enters the compressor body 1 for forced lubrication. The hot oil in the temperature-controlled oil filter holder 5 flows through the hot oil outlet to the heat source inlet and then into the oil cooler 7. After being cooled by the oil cooler 7, the hot oil flows through the heat source outlet back into the auxiliary oil pump 4 and the compressor body 1. This allows for temperature control of the lubricating oil entering the compressor body 1, thereby ensuring the stable operation of the screw air compressor.

[0042] In this embodiment, both the oil-cooled cooler 7 and the air-cooled cooler 3 adopt water cooling. Compared with traditional air cooling, water has a higher specific heat capacity and thermal conductivity than air. Therefore, the oil-cooled cooler 7 and the air-cooled cooler 3 can more effectively remove heat, making them suitable for equipment that operates under high load or for long periods of time. They also have lower operating noise, more stable temperature control, and help maintain the normal operating temperature of various components of the air compressor. This reduces the thermal stress and wear on components caused by high temperatures and extends the service life of the equipment.

[0043] The screw air compressor with a special oil lubrication system also includes an oil filter 6, whose two ends are connected to a temperature-controlled oil filter holder 5 and an auxiliary oil pump 4, respectively. The oil filter 6 performs a filtering function; its inlet is connected to the temperature-controlled oil filter holder 5 and the heat source outlet, while its outlet is connected to the auxiliary oil pump 4. This allows both the cold oil in the temperature-controlled oil filter holder 5 and the hot oil cooled by the oil cooler 7 to be filtered through the oil filter 6, effectively removing particulate matter and contaminants from the lubricating oil. The oil filter 6 can use a high-precision filter element to effectively remove particulate matter and contaminants from the lubricating oil. This series flow path design ensures effective cooling and separation of compressed air, resulting in high-quality compressed air and providing reliable assurance for subsequent applications. A pressure gauge is installed in the lubricating oil delivery pipeline to monitor the lubricating oil pressure.

[0044] The screw air compressor with a special oil lubrication system also includes a vacuum generator 8. The two ends of the vacuum generator 8 are connected to the oil return port of the compressor body 1 (due to shaft seal failure) and the main air inlet of the compressor body 1, respectively, so that the lubricating oil leaking from the oil return port is drawn into the main unit of the compressor body 1. When the main shaft seal of the compressor body 1 fails, the leaking lubricating oil is drawn into the main unit of the compressor body 1 through an external oil circuit and the vacuum generator 8, preventing the main unit of the compressor body 1 from experiencing reduced lubrication and increased equipment wear due to oil leakage caused by shaft seal failure. This effectively addresses the problem of compressor shaft seal failure and ensures the normal operation of the screw air compressor. Simultaneously, it enables reliable operation in medium-pressure screw compressor systems with discharge pressures above 2.0 MPa, thus solving many problems existing in current technologies.

[0045] The screw air compressor with a special oil lubrication system also includes a pressure regulating valve 9, whose two ends are connected to the oil-gas tank 2 and the vacuum generator 8, respectively. The pressure regulating valve 9 is used to reduce the control gas pressure of the vacuum generator 8. Specifically, the oil return port of the compressor body 1 due to shaft seal failure is led to the main unit's air inlet through a connecting pipeline. The vacuum generator 8 is installed at the air inlet, and a pure, slightly oily gas source is introduced from the oil-gas tank 2. The high-pressure gas in the oil-gas tank 2 is reduced to a suitable low-pressure gas through the pressure regulating valve 9 and introduced into the vacuum generator 8. The vacuum generator 8 is used to draw the leaked lubricating oil into the main unit of the compressor body 1. The advantage of this is that when the compressor main unit's shaft seal fails, it avoids the compressor main unit from leaking oil due to shaft seal failure, which would lead to a decrease in lubrication effect and accelerated wear and damage to the equipment. The vacuum generator 8 is pneumatically controlled.

[0046] The screw air compressor with a special oil lubrication system also includes an intake hose 10, which is connected to the intake end of the compressor body 1. By connecting the intake hose 10 to the intake end of the compressor body 1, the intake hose 10 is used to draw fresh air from the outside into the compressor body 1. The intake hose 10 is made of pressure-resistant and high-temperature-resistant materials, which not only ensures the sealing of the pipeline but also plays a role in buffering vibration and compensating for deformation, ensuring a stable and reliable intake process.

[0047] The screw air compressor with a special oil lubrication system also includes an intake valve 11. The bottom of the intake valve 11 is connected to the intake end of the compressor body 1, and the intake hose 10 is sealed to the top of the intake valve 11. The intake hose 10 is used to connect to the outside of the intake valve 11 to draw fresh air from the outside into the compressor body 1. The intake hose 10 can be made of pressure-resistant and wear-resistant rubber hose to ensure the reliability of the intake process.

[0048] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A screw air compressor with a special oil circuit lubrication system, characterized in that, It includes a compressor body, an oil-gas tank, an air-cooled cooler, and an auxiliary oil pump. The oil-gas tank has an air inlet, an oil outlet, and an oil outlet. The air inlet is connected to the exhaust end of the compressor body, and the oil outlet is connected to the air-cooled cooler, so that the compressor body, the oil-gas tank, and the air-cooled cooler are connected in sequence. The inlet and outlet of the auxiliary oil pump are respectively connected to the oil outlet and the compressor body, so that the lubricating oil in the oil-gas tank enters the compressor body through the auxiliary oil pump.

2. The screw air compressor with a special oil circuit lubrication system as described in claim 1, characterized in that, The screw air compressor with a special oil circuit lubrication system also includes a temperature-controlled oil filter base, the two ends of which are respectively connected to the oil outlet and the inlet of the auxiliary oil pump, and are connected to the oil-gas tank and the auxiliary oil pump.

3. The screw air compressor with a special oil circuit lubrication system as described in claim 2, characterized in that, The temperature-controlled oil filter has an oil inlet, a cold oil outlet, and a hot oil outlet. The oil inlet is connected to the oil outlet, and the cold oil outlet is connected to the inlet of the auxiliary oil pump. The screw air compressor with a special oil circuit lubrication system also includes an oil cooler. The oil cooler has a heat source inlet and a heat source outlet. The heat source inlet is connected to the hot oil outlet, and the heat source outlet is connected to the inlet of the auxiliary oil pump.

4. The screw air compressor with a special oil circuit lubrication system as described in claim 2, characterized in that, The screw air compressor with a special oil circuit lubrication system also includes an oil filter, the two ends of which are connected to the temperature-controlled oil filter holder and the auxiliary oil pump, respectively.

5. The screw air compressor with a special oil circuit lubrication system as described in claim 1, characterized in that, The auxiliary oil pump is a magnetically driven gear pump.

6. The screw air compressor with a special oil circuit lubrication system as described in claim 1, characterized in that, The screw air compressor with a special oil circuit lubrication system also includes a vacuum generator. The two ends of the vacuum generator are respectively connected to the oil return port of the shaft seal failure of the compressor body and the air inlet of the compressor body, so that the lubricating oil leaking from the oil return port of the shaft seal failure is drawn into the main body of the compressor body.

7. The screw air compressor with a special oil circuit lubrication system as described in claim 6, characterized in that, The screw air compressor with a special oil circuit lubrication system also includes a pressure regulating valve, the two ends of which are respectively connected to the oil-gas tank and the vacuum generator.

8. The screw air compressor with a special oil circuit lubrication system as described in claim 1, characterized in that, The screw air compressor with a special oil circuit lubrication system also includes a one-way valve, the two ends of which are respectively connected to the exhaust end of the compressor body and the air inlet, and are connected to the compressor body and the oil-gas tank.

9. The screw air compressor with a special oil circuit lubrication system as described in claim 1, characterized in that, The screw air compressor with a special oil circuit lubrication system also includes an intake hose, which is connected to the intake end of the compressor body.

10. The screw air compressor with a special oil circuit lubrication system as described in claim 9, characterized in that, The screw air compressor with a special oil circuit lubrication system also includes an intake valve, the bottom of which is connected to the intake end of the compressor body, and the intake hose is sealed to the top of the intake valve.

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