A device for lubricating a screw compressor without stopping

Abstract

The utility model discloses a kind of screw compressor not stopping to inject lubricating oil's device, including booster diaphragm pump, screw compressor, the booster diaphragm pump top arbitrary one end is connected instrument wind interface through power pipeline, the oil inlet in the bottom of booster diaphragm pump is connected oil supplementing port through oil inlet pipeline, the oil outlet in the bottom of booster diaphragm pump is connected lubricating oil outlet through oil outlet pipeline, the lubricating oil outlet is connected screw compressor first-stage oil separation cylinder blowdown at oil hose, and the oil supplementing port is accessed in lubricating oil barrel.This utility model solves the problem of complex operation, suitable for single filling and prone to safety hazards in prior art lubricating oil injection.The utility model is suitable for different specifications of screw coalbed gas and air type compressor oil supplement, and a online oil supplementing device is suitable for all with pressure oil separation barrel lubricating oil injection, with wide application range, and injection amount is not limited.

Description

Technical Field

[0001] This utility model belongs to the field of screw compressor maintenance, specifically relating to a device for adding lubricating oil to a screw compressor without stopping it. Background Technology

[0002] The lubrication methods of screw process compressors are divided into oil lubrication and oilless lubrication. At present, oil lubrication is still the main method, using drip oil or oil spray oil. Oil spray screw compressors are the most widely used type in the Mabi project.

[0003] The lubrication process of an oil-injected screw compressor is as follows:

[0004] The screw compressor draws in coalbed methane from the intake pipe, pre-filters it through an intake filter separator, and then filters it again through a 0.3-micron filter element before entering the compressor rotor chamber for compression. The rotor is driven by a 10KV main motor via a diaphragm coupling. A precisely controlled, continuous injection of compressor oil into the rotor chamber lubricates and cools the rotating screw, and also provides a sealing function. After compression, the oil-containing coalbed methane is discharged from the compressor head and directly enters the oil-gas separator through a pipeline to separate the oil from the compressed coalbed methane. The separated oil is cooled in an oil-air cooler and then flows through an oil filter back to the injection port. The separated compressed coalbed methane passes through the oil-gas separator, filtering out some of the oil, resulting in an oil content of only 1-3 mg / m³ in the compressed air. 3 Then, the compressed coalbed methane passes through a minimum pressure check valve and returns to the process cooler for further cooling. After cooling, the compressed coalbed methane passes through an oil-water separator and finally enters the external pipeline. The temperature control valve maintains the normal oil temperature throughout the entire operation, ensuring that the screw compressor operates at the optimal temperature in all operating stages.

[0005] During the operation of a screw compressor, the amount of lubricating oil will gradually decrease due to prolonged operation or failure of the oil separator filter, resulting in reduced oil-gas separation efficiency. This decrease in lubricating oil can lead to malfunctions such as bearing damage. Replenishing lubricating oil requires stopping the compressor and depressurizing. In projects where there is no backup screw compressor, replenishing lubricating oil necessitates sacrificing production time. Therefore, we are researching a method to inject lubricating oil into the lubrication system via a high-pressure pump without shutting down the compressor, thereby reducing the number of compressor shutdowns and air loss.

[0006] The specification of Chinese utility model patent (CN207539037U) discloses a screw compressor and its lubricating oil replenishment device, which adds lubricating oil to an external oil storage tank, and after sealing, opens the filling valve and connecting valve. After equalizing the pressure, the lubricating oil in the oil storage tank flows into the oil distribution tank by gravity, thus achieving the purpose of adding lubricating oil. It is only applicable to air screw compressors.

[0007] This patent requires secondary lubrication, involves multiple valves, is prone to secondary contamination, and has a small filling volume, making overflow easy. It also poses risks of slipping, falling, and mechanical injury to operators. It is suitable for lubricating a single air screw compressor, but requires adding a lubricating tank, connecting pipelines, valves, and other permanent facilities to the compressor, increasing the equipment's footprint, affecting the original unit design, potentially causing pipeline rupture due to equipment vibration, increasing the original chassis weight, potentially causing weld cracking due to uneven stress, and potentially leading to lubricating oil leakage or even fire hazards due to pipeline or valve damage. It is suitable for air screw compressors (commonly known as air compressors) used as power sources for industrial production instrument air or fresh air systems, and is generally suitable for non-explosion-proof areas. It requires operating different valves in stages; incorrect or reversed operation sequence will cause lubricating oil to splash from the screw compressor, causing personal injury, environmental pollution, and even fire and explosion. Summary of the Invention

[0008] To overcome the shortcomings of existing technologies in lubricating oil filling operations, their applicability to single-unit filling, and the potential for safety hazards, this utility model provides a device suitable for oil replenishment of screw-type coalbed methane and air-type compressors of different specifications. One online oil replenishment device is applicable to all pressurized oil tanks for lubricating oil filling, with a wide range of applications; it is also a device for lubricating oil filling of screw compressors without stopping the machine, with no limit on the filling amount.

[0009] The technical solution adopted by this utility model to achieve the above objectives is:

[0010] A device for adding lubricating oil to a screw compressor without stopping the compressor includes a booster diaphragm pump and a screw compressor. One end of the top of the booster diaphragm pump is connected to an instrument air inlet via a power pipeline. The oil inlet at the bottom of the booster diaphragm pump is connected to a makeup oil port via an oil inlet pipeline. The oil outlet at the bottom of the booster diaphragm pump is connected to a lubricating oil outlet via an oil outlet pipeline. The lubricating oil outlet is connected to the drain port of the first-stage oil separator of the screw compressor via a hose. The makeup oil port is connected to a lubricating oil tank. This invention connects the makeup oil port to the lubricating oil tank, connects the instrument air inlet to the instrument air inlet, and connects the oil outlet hose to the drain port of the first-stage oil separator of the screw compressor and secures it. The makeup oil pipeline is opened, and the instrument air pressure is adjusted to 0.7–0.8 MPa. After the makeup oil outlet pressure gauge reaches 1.1 MPa, the makeup oil switch is opened to start adding oil. After the oil level is full, the driver pressure is adjusted to 0 MPa, the pressure relief port is opened, and excess lubricating oil is returned to the oil tank.

[0011] Furthermore, an adjustable refueling speed regulating valve and an oil mist lubricator are sequentially installed on the power pipeline. A first pressure gauge for driving the regulating valve is installed on the regulating valve. The oil mist lubricator is a lubricating oil cup at the instrument air inlet, providing lubrication for the moving parts inside the pump as the instrument air enters. An adjustable valve is provided at the instrument air inlet to adjust the pressure of the instrument air, thereby adjusting the operating frequency of the booster pump.

[0012] Furthermore, the booster diaphragm pump is equipped with a pump head check valve at the bottom to prevent backflow of lubricating oil.

[0013] Furthermore, a high-pressure switch and a four-way pipe are sequentially installed on the oil outlet pipe. The bottom of the four-way pipe is connected to a pressure relief pipe, which is sequentially connected to a pressure relief switch and a pressure relief port. A second pressure gauge is connected to the top of the four-way pipe. The oil circuit is equipped with a pressure relief port, allowing the high-pressure lubricating oil to be released after refueling. The pressure relief switch should be a throttling valve to control the pressure relief rate. After the oil replenishment outlet pressure gauge reaches 1.1 MPa, open the oil replenishment switch to begin refueling; once the oil level is full, adjust the driver pressure to 0 MPa, open the pressure relief port, and allow excess lubricating oil to flow back into the oil tank.

[0014] Preferably, the first and second pressure gauges are shock-resistant pressure gauges to avoid shortening their lifespan due to shocks during operation; the high-pressure switch is a high-pressure ball valve or a shut-off valve for easy and quick operation.

[0015] Preferably, the instrument air interface is a quick-connect instrument air interface, the oil filler port is a quick-connect oil filler port, and the lubricating oil outlet is a quick-connect lubricating oil outlet. Quick-connect plugs are provided at the oil inlet and outlet for easy refueling later.

[0016] Preferably, the connecting parts between the power pipeline, the oil inlet pipeline, the oil outlet pipeline and the booster diaphragm pump are all made of 304 stainless steel, and the four-way pipe is a 304 stainless steel four-way pipe.

[0017] Preferably, the booster diaphragm pump, power pipeline, oil inlet pipeline, oil outlet pipeline, and pressure relief pipeline are all fixed to the flat trolley using pipeline supports. The refueling device is mounted on the flat trolley, with its internal pipelines fixed, and only the instrument air interface, oil inlet, and oil outlet externally connected.

[0018] This utility model involves inserting the filler port of a diaphragm booster pump into a finished lubricating oil tank. The pump pressurizes the oil, and its outlet is connected to the drain valve at the bottom of the screw compressor. The return valve is slowly closed, and once the outlet pressure reaches the equalization or overpressure of the oil separator tank of the screw compressor, the oil filling valve is opened to add lubricating oil into the oil separator tank, thus achieving the purpose of adding lubricating oil. This invention is applicable to screw compressors for coalbed methane, natural gas, and air.

[0019] This invention directly uses the original lubricating oil drum for filling, allowing for a large filling volume. It eliminates the need for secondary handling and prevents lubricating oil spillage that could cause slips and falls. A one-way valve connects the filling port to the oil separator tank; during filling, simply short-circuit the filling port to the oil separator tank's drain port. Even if the valve leaks internally, the one-way valve will not allow pressure from the oil separator tank to flow back to the filling pump, ensuring personal safety. The lubricating oil filling port pressure is slowly increased to the oil separator tank pressure via a return valve before the filling port valve is opened, allowing for a slow pressure rise. This allows for early intervention in case of danger, eliminating the risk of lubricating oil splashing and pressure shock to pipelines and the oil separator tank, thus extending the equipment's service life.

[0020] This invention is applicable to all screw-type coalbed methane and air compressors. It requires no additional facilities to the equipment, does not affect the original design of the equipment, and will not cause accidents such as cracking of equipment pipelines and containers. For screw compressors with different interfaces, only the original equipment drain port connector needs to be replaced for applicability. It is suitable for the filling of air screw compressors and natural gas and coalbed methane screw compressors. Because there is no power source, it meets the explosion-proof requirements and can be used in relatively harsh explosion-proof environments.

[0021] When using this invention, simply connect the diaphragm booster pump instrument air duct and the inlet and outlet pipelines, slowly increase the pressure to the oil separator tank pressure, and then open the oil injection valve to add oil. The operation is simple. Even if there is an operational error, the return valve will automatically open to release the pressure to the lubricating oil tank, which will not cause personal injury or environmental pollution. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of the connection principle of this utility model.

[0024] Explanation of reference numerals in the attached diagram: 1. Booster diaphragm pump; 2. Instrument air inlet; 3. Oil replenishment port; 4. Lubricating oil outlet; 5. Power pipeline; 6. Regulating valve; 7. First pressure gauge; 8. Oil mist lubricator; 9. Oil inlet pipeline; 10. High-pressure switch; 11. Four-way pipe; 12. Second pressure gauge; 13. Pressure relief pipeline; 14. Pressure relief switch; 15. Pressure relief port; 16. Pump head check valve; 17. Oil outlet pipeline. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0026] Example 1

[0027] like Figure 1As shown, the screw compressor non-stop lubrication device of this embodiment includes a booster diaphragm pump 1 and a screw compressor. One end of the top of the booster diaphragm pump 1 is connected to the instrument air interface 2 via a power pipe 5. The oil inlet at the bottom of the booster diaphragm pump 1 is connected to the oil replenishment port 3 via an oil inlet pipe 9. The oil outlet at the bottom of the booster diaphragm pump 1 is connected to the lubricating oil outlet 4 via an oil outlet pipe. The lubricating oil outlet 4 is connected to the drain port of the first-stage oil separator of the screw compressor via a hose. The oil replenishment port 3 is connected to the lubricating oil tank. In this invention, the oil replenishment port 3 is connected to the lubricating oil tank, the instrument air interface is connected to the instrument air, and the oil outlet hose is connected to the drain port of the first-stage oil separator of the screw compressor and secured. The oil replenishment pipeline is opened, and the instrument air pressure is adjusted to 0.7–0.8 MPa.

[0028] Furthermore, an adjustable refueling speed regulating valve 6 and an oil mist lubricator 8 are sequentially installed on the power pipeline 5. A first pressure gauge 7 for driving the regulating valve is installed on the regulating valve. The oil mist lubricator 8 is a lubricating oil cup for the instrument air inlet, which provides lubrication for the moving parts inside the pump as the instrument air enters the booster pump. The instrument air inlet is equipped with an adjustable valve 6, which adjusts the pressure of the instrument air, thereby adjusting the operating frequency of the booster pump.

[0029] Furthermore, the booster diaphragm pump 1 is equipped with a pump head check valve 16 at the bottom to prevent backflow of lubricating oil.

[0030] Furthermore, a high-pressure switch 10 and a four-way pipe 11 are sequentially installed on the oil outlet pipe 17. The bottom of the four-way pipe 11 is connected to a pressure relief pipe 13, and a pressure relief switch 14 and a pressure relief port 15 are sequentially connected to the pressure relief pipe 13. A second pressure gauge 12 is connected to the top of the four-way pipe 11. The oil circuit is equipped with a pressure relief port 15, which allows the high-pressure lubricating oil to be released after refueling. The pressure relief switch 14 should be a throttling valve to control the pressure relief rate. After the oil replenishment outlet pressure gauge reaches 1.1 MPa, the oil replenishment switch is opened to start oil refueling; after the oil level is full, the driver pressure is adjusted to 0 MPa, and the pressure relief port 15 is opened to allow excess lubricating oil to flow back into the oil tank.

[0031] Preferably, the first pressure gauge 7 and the second pressure gauge 12 are shock-resistant pressure gauges to avoid shortening the life of the pressure gauges due to shocks during operation; the high-pressure switch 10 is a high-pressure ball valve or a shut-off valve for easy and quick operation.

[0032] Preferably, the connecting parts between the power pipeline 5, the oil inlet pipeline 9, the oil outlet pipeline 17 and the booster diaphragm pump 1 are all made of 304 stainless steel, and the four-way pipe 11 is a 304 stainless steel four-way pipe 11.

[0033] Example 2

[0034] like Figure 1As shown, the screw compressor non-stop lubrication device of this embodiment includes a booster diaphragm pump 1 and a screw compressor. One end of the top of the booster diaphragm pump 1 is connected to the instrument air interface 2 via a power pipe 5. The oil inlet at the bottom of the booster diaphragm pump 1 is connected to the oil replenishment port 3 via an oil inlet pipe 9. The oil outlet at the bottom of the booster diaphragm pump 1 is connected to the lubricating oil outlet 4 via an oil outlet pipe. The lubricating oil outlet 4 is connected to the drain port of the first-stage oil separator of the screw compressor via a hose. The oil replenishment port 3 is connected to the lubricating oil tank. In this invention, the oil replenishment port 3 is connected to the lubricating oil tank, the instrument air interface is connected to the instrument air, and the oil outlet hose is connected to the drain port of the first-stage oil separator of the screw compressor and secured. The oil replenishment pipeline is opened, and the instrument air pressure is adjusted to 0.7–0.8 MPa.

[0035] Furthermore, an adjustable valve 6 and an oil mist lubricator 8 are sequentially installed on the power pipeline 5. The oil mist lubricator 8 is a lubricating oil cup for the instrument air inlet, which provides lubrication for the moving parts inside the pump as the instrument air enters the booster pump; the instrument air inlet is equipped with an adjustable valve, which adjusts the pressure of the instrument air, thereby adjusting the operating frequency of the booster pump.

[0036] Furthermore, the booster diaphragm pump 1 is equipped with a pump head check valve 16 at the bottom to prevent backflow of lubricating oil.

[0037] Furthermore, a high-pressure switch 10 and a four-way pipe 11 are sequentially installed on the oil outlet pipe 17. The bottom of the four-way pipe 11 is connected to a pressure relief pipe 13, and a pressure relief switch 14 and a pressure relief port 15 are sequentially connected to the pressure relief pipe 13. A second pressure gauge 12 is connected to the top of the four-way pipe 11. The oil circuit is equipped with a pressure relief port 15, which allows the high-pressure lubricating oil to be released after refueling. The pressure relief switch 14 should be a throttling valve to control the pressure relief rate. After the oil replenishment outlet pressure gauge reaches 1.1 MPa, the oil replenishment switch is opened to start oil refueling; after the oil level is full, the driver pressure is adjusted to 0 MPa, and the pressure relief port 15 is opened to allow excess lubricating oil to flow back into the oil tank.

[0038] Preferably, the first pressure gauge 7 and the second pressure gauge 12 are shock-resistant pressure gauges to avoid shortening the life of the pressure gauges due to shocks during operation; the high-pressure switch 10 is a high-pressure ball valve or a shut-off valve for easy and quick operation.

[0039] Preferably, the connecting parts between the power pipeline 5, the oil inlet pipeline 9, the oil outlet pipeline and the booster diaphragm pump 1 are all made of 304 stainless steel, and the four-way pipe 11 is a 304 stainless steel four-way pipe 11.

[0040] Preferably, the instrument air interface 2 is a quick-connect type, the oil filler port 3 is a quick-connect type, and the lubricating oil outlet 4 is a quick-connect type. The oil inlet and outlet are equipped with quick-connect plugs for easy refueling later.

[0041] Preferably, the booster diaphragm pump 1, power pipeline 5, oil inlet pipeline 9, oil outlet pipeline 17, and pressure relief pipeline 13 are all fixed to the flat trolley using pipeline supports. The refueling device is set on the flat trolley, with the internal pipelines fixed, and only the instrument air interface 2, oil inlet, and oil outlet on the outside.

[0042] The above description represents the preferred embodiments of this utility model. The specific embodiments are provided only for a better understanding of the concept of this utility model. For those skilled in the art, several improvements or equivalent substitutions can be made based on the principles of this utility model, and these improvements or equivalent substitutions are also considered to fall within the protection scope of this utility model.

Claims

1. A device for adding lubricating oil to a screw compressor without stopping the compressor, characterized in that, The system includes a booster diaphragm pump and a screw compressor. One end of the top of the booster diaphragm pump is connected to the instrument air interface via a power pipeline. The oil inlet at the bottom of the booster diaphragm pump is connected to the oil replenishment port via an oil inlet pipeline. The oil outlet at the bottom of the booster diaphragm pump is connected to the lubricating oil outlet via an oil outlet pipeline. The lubricating oil outlet is connected to the drain port of the first-stage oil separator of the screw compressor via a hose. The oil replenishment port is connected to the lubricating oil tank.

2. The device for adding lubricating oil to a screw compressor without stopping operation according to claim 1, characterized in that, The power pipeline is sequentially equipped with a regulating valve and an oil mist lubricator for adjusting the refueling speed, and a first pressure gauge for driving the regulating valve is installed on the regulating valve.

3. The device for adding lubricating oil to a screw compressor without stopping operation according to claim 1, characterized in that, The booster diaphragm pump is equipped with a pump head check valve at the bottom.

4. The device for adding lubricating oil to a screw compressor without stopping operation according to claim 2, characterized in that, A high-pressure switch and a four-way pipe are installed sequentially on the oil outlet pipe. The bottom of the four-way pipe is connected to a pressure relief pipe. A pressure relief switch and a pressure relief port are sequentially connected to the pressure relief pipe. A second pressure gauge is connected to the top of the four-way pipe.

5. The device for adding lubricating oil to a screw compressor without stopping operation according to claim 4, characterized in that, Both the first and second pressure gauges are shock-resistant pressure gauges, and the high-pressure switch is a high-pressure ball valve or a shut-off valve.

6. The device for adding lubricating oil to a screw compressor without stopping operation according to claim 5, characterized in that, The instrument air interface is a quick-connect instrument air interface, the oil replenishment port is a quick-connect oil replenishment port, and the lubricating oil outlet is a quick-connect lubricating oil outlet.

7. The device for adding lubricating oil to a screw compressor without stopping operation according to claim 6, characterized in that, The connecting parts between the power pipeline, oil inlet pipeline, oil outlet pipeline and the booster diaphragm pump are all made of 304 stainless steel, and the four-way pipe is a 304 stainless steel four-way pipe.

8. The device for adding lubricating oil to a screw compressor without stopping operation according to claim 6, characterized in that, The booster diaphragm pump, power pipeline, oil inlet pipeline, oil outlet pipeline, and pressure relief pipeline are all fixed on a flat trolley using pipeline supports.

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