A screw compressor set with non-stop oil filling device

Abstract

The utility model belongs to a kind of screw compressor set with not stopping oiling device;Including screw compressor, the oil inlet of screw compressor is connected with the oil outlet of oil-gas separator by pipeline, the oil return of screw compressor is connected with the oil return of oil-gas separator by pipeline, the oil inlet of oil-gas separator is connected with oil extraction pipeline unit by pipeline circulation pressurizing unit;The oil-gas separator is equipped with first pressure sensor, and the pipeline circulation pressurizing unit is equipped with second pressure sensor;It has the advantages of reasonable process design, reducing the labor intensity of field operator, improving work efficiency, realizing the long-period operation of screw compressor, avoiding the frequent start-stop of screw compressor to affect the operation safety and service life defects.

Description

Technical Field

[0001] This utility model belongs to the field of screw compressor lubrication technology, specifically a non-stop lubrication device for screw compressor units. Background Technology

[0002] Existing screw compressor units require lubricating oil to lubricate the high-speed rotating screw during operation to ensure safe and stable operation. When the lubricating oil level is low, the screw compressor unit needs to be replenished with lubricating oil in a timely manner. However, the lubricating oil inside the screw compressor unit has a certain pressure. Therefore, during the replenishment process, the screw compressor must be stopped to release the pressure in the unit system, and then the oil pipe must be manually connected to replenish the lubricating oil inside the screw compressor unit. The above process is labor-intensive, and the frequent start-up and shutdown of the equipment not only affects the working efficiency of the equipment, but also affects the stability and service life of the equipment. Utility Model Content

[0003] To overcome the above deficiencies, this utility model provides a non-stop refueling device for screw compressor units to solve the technical problems existing in the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A non-stop refueling device for a screw compressor unit includes a screw compressor. The oil inlet of the screw compressor is connected to the oil outlet of an oil-gas separator via a pipeline, and the oil return port of the screw compressor is connected to the oil return port of the oil-gas separator via a pipeline. The oil inlet of the oil-gas separator is connected to an oil extraction pipeline unit via a pipeline circulation pressurization unit. The oil-gas separator is equipped with a first pressure sensor, and the pipeline circulation pressurization unit is equipped with a second pressure sensor.

[0006] The beneficial effects of this utility model are as follows: This utility model utilizes an oil extraction pipeline unit to supply lubricating oil to a pipeline circulation pressurization unit, and performs circulation pressurization within the pipeline circulation pressurization unit. When the pressure within the pipeline circulation pressurization unit is greater than the pressure within the oil-gas separator, the pipeline circulation pressurization unit supplies lubricating oil to the oil-gas separator. The oil-gas separator is connected to the screw compressor (both have the same pressure), that is, lubricating oil is added to the running screw compressor through the oil-gas separator, thereby achieving the purpose of refueling the screw compressor without stopping it; the oil-gas separator and the screw compressor described in this utility model are in a connected state. The lubricating oil in the oil-gas separator enters the screw compressor through the oil inlet to lubricate the high-speed rotating screw. Part of the compressed gas and lubricating oil enter the oil-gas separator through the oil return ports of the screw compressor and the oil-gas separator. After the gas is separated, the lubricating oil circulates back into the screw compressor for reuse. Based on the above, this invention achieves the characteristic of replenishing oil inside the screw compressor without stopping by allowing the lubricating oil pressurized by the pipeline circulation pressurization unit to enter the oil-gas separator. The timing of lubricating oil addition can be confirmed by setting a first pressure sensor and a second pressure sensor.

[0007] Preferably, the pipeline circulation pressurization unit includes an oil pump, the inlet end of which is connected to the oil extraction pipeline unit via a pipeline, the outlet end of which is connected to the oil inlet of the oil-gas separator, and a bypass pipeline with a return oil regulating valve is provided between the corresponding pipeline at the inlet end of the oil pump and the corresponding pipeline at the outlet end of the oil pump; a second pressure sensor is provided on the pipeline between the outlet end of the oil pump and the bypass pipeline.

[0008] Preferably, a check valve is provided between the outlet end of the oil pump and the second pressure sensor.

[0009] Preferably, the oil extraction pipeline unit includes an oil extraction pipe, the first end of which is connected to the bottom of the oil tank, a flow meter is provided in the middle of the oil extraction pipe, and a control valve is provided at the end of the oil extraction pipe.

[0010] Preferably, the oil-gas separator is equipped with a liquid level sensor, and an oil separator shut-off valve and an oil separator regulating valve are provided between the oil inlet of the oil-gas separator and the pipeline circulation pressurization unit.

[0011] Preferably, both the pipeline circulation pressurization unit and the oil extraction pipeline unit are housed within the casing.

[0012] Preferably, a PLC control system is provided on the outer wall of the housing. The signal input terminal of the PLC control system is connected to the flow meter, the liquid level sensor, the first pressure sensor, and the second pressure sensor. The signal output terminal of the PLC control system is connected to the oil pump, the oil inlet separator regulating valve, the oil return regulating valve, and the control valve, respectively.

[0013] A non-stop refueling device for a screw compressor unit, manufactured according to the above scheme, supplies lubricating oil to a pipeline circulation pressurization unit via an oil extraction pipeline unit. The lubricating oil circulates and is pressurized within the pipeline circulation pressurization unit. Simultaneously, the pressure data from a first pressure sensor and a second pressure sensor are monitored. When the pressure in the second pressure sensor exceeds the pressure in the first pressure sensor, the lubricating oil in the pipeline circulation pressurization unit enters the oil-gas separator. Through the circulation established between the oil-gas separator and the screw compressor, the device achieves the characteristic of refueling the screw compressor without stopping it. This invention constructs a circulation pressurization system within the pipeline circulation pressurization unit. This system primarily uses an oil pump to achieve oil extraction and circulation for lubrication via the oil extraction pipeline unit. The purpose of this invention is to pressurize the oil and deliver the lubricating oil to the oil-gas separator. By incorporating a level sensor, the liquid level within the oil-gas separator can be monitored, allowing for timely replenishment of lubricating oil when the level is insufficient. A flow meter is also included; the combination of the flow meter and the level sensor allows for the prediction of the required lubricating oil replenishment amount and the calculation of the remaining lubricating oil in the oil tank. This enables the delivery of a fixed quantity of lubricating oil to the pipeline circulation and pressurization unit, and facilitates timely replacement of the oil tank when the lubricating oil level is low. The invention offers advantages such as a rational process design, reduced labor intensity for on-site operators, improved work efficiency, long-cycle operation of the screw compressor, and avoidance of frequent start-stop cycles that could affect operational safety and service life. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the control principle of this utility model.

[0017] In the diagram: 1. Screw compressor; 2. Oil-gas separator; 3. First pressure sensor; 4. Second pressure sensor; 5. Oil pump; 6. Oil return regulating valve; 7. Check valve; 8. Oil suction pipe; 9. Oil tank; 10. Flow meter; 11. Control valve; 12. Liquid level sensor; 13. Oil inlet separator shut-off valve; 14. Oil inlet separator regulating valve; 15. Housing; 16. PLC control system. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] The following is in conjunction with the appendix Figure 1 This application provides a further detailed description of a non-stop refueling device for a screw compressor unit. The device includes a screw compressor 1, whose inlet is connected to the outlet of an oil-gas separator 2 via a pipe, and whose return port is connected to the return port of the oil-gas separator 2 via a pipe. The inlet of the oil-gas separator 2 is connected to an oil extraction pipeline unit via a pipeline circulation pressurization unit. A first pressure sensor 3 is installed on the oil-gas separator 2, and a second pressure sensor 4 is installed on the pipeline circulation pressurization unit. This invention is a non-stop lubrication device designed based on an existing screw compressor 1. The device uses a pipeline circulation pressurization unit to circulate and pressurize the lubricating oil from the oil extraction pipeline unit, making its pressure greater than the pressure of the lubricating oil inside the screw compressor 1. Simultaneously, it constructs an operating lubricating oil circulation unit between the screw compressor 1 and the oil-gas separator 2. While ensuring the normal operation of the screw compressor 1 by circulating between the screw compressor 1 and the oil-gas separator 2, the pressurized lubricating oil from the pipeline circulation pressurization unit is injected into the oil-gas separator 2, thus achieving lubrication without stopping the screw compressor 1. The timing of the pressurized lubricating oil injection in this invention is mainly determined by the pressure displayed by the first pressure sensor 3 and the second pressure sensor 4. Specifically, the pressure of the injected pressurized lubricating oil should be greater than the pressure inside the oil-gas separator 2, that is, the pressure displayed by the second pressure sensor 4 should be greater than the pressure displayed by the first pressure sensor 3. Preferably, the pressure difference between the two pressure sensors is 0.1–0.3 MPa.

[0020] Furthermore, the pipeline circulation pressurization unit includes an oil pump 5. The inlet end of the oil pump 5 is connected to the oil extraction pipeline unit via a pipeline, and the outlet end of the oil pump 5 is connected to the oil inlet of the oil-gas separator 2. A bypass pipeline with a return oil regulating valve 6 is provided between the corresponding pipeline at the inlet end of the oil pump 5 and the corresponding pipeline at the outlet end of the oil pump 5. A second pressure sensor 4 is provided on the pipeline between the outlet end of the oil pump 5 and the bypass pipeline. The oil pump 5 described in this utility model can allow the lubricating oil in the oil extraction pipeline unit to enter the pipeline circulation pressurization unit, and can also realize the circulation pressurization of the lubricating oil in the pipeline circulation pressurization unit. At the same time, it can also deliver the pressurized lubricating oil to the oil-gas separator 2. In the specific operation process, the oil pump 5, the outlet end of the oil pump 5, the inlet end of the oil pump 5, and the bypass pipeline with the return oil regulating valve 6 constitute the circulation pressurization channel for the lubricating oil, and the pressure of the lubricating oil is detected in real time by the second pressure sensor 4.

[0021] Furthermore, a check valve 7 is provided between the outlet end of the oil pump 5 and the second pressure sensor 4.

[0022] Furthermore, the oil extraction pipeline unit includes an oil extraction pipe 8, the first end of which is connected to the inner bottom of the oil tank 9. A flow meter 10 is installed in the middle of the oil extraction pipe 8, and a control valve 11 is installed at the end of the oil extraction pipe 8. This utility model, by setting the flow meter 10, can detect the flow rate of lubricating oil through the oil extraction pipe 8, thereby determining the amount of lubricating oil in the oil tank 9. When the amount of lubricating oil in the oil tank 9 is low, it can be replaced in a timely manner.

[0023] Furthermore, the oil-gas separator 2 is equipped with a liquid level sensor 12, and an oil inlet separator shut-off valve 13 and an oil inlet separator regulating valve 14 are provided between the oil inlet of the oil-gas separator 2 and the pipeline circulation pressurization unit. The liquid level sensor 12 in this invention is used to detect the liquid level in the oil-gas separator 2 in real time to determine the timing for adding lubricating oil online. Furthermore, the amount of lubricating oil to be added can be determined by the liquid level sensor 12 and the volume of the oil-gas separator 2. By cooperating with the flow meter 10, the oil extraction pipeline unit accurately extracts lubricating oil into the pipeline circulation pressurization unit, thereby achieving the characteristic of saving oil pump energy consumption. During normal use, the oil inlet separator shut-off valve 13 is in the normally open state. When lubricating oil needs to be added, the oil inlet separator regulating valve 14 can be opened.

[0024] Furthermore, both the pipeline circulation pressurization unit and the oil extraction pipeline unit are located inside the housing 15.

[0025] Furthermore, such as Figure 1 , 2As shown, a PLC control system 16 is provided on the outer wall of the housing 15. The signal input terminal of the PLC control system 16 is connected to the flow meter 10, the liquid level sensor 12, the first pressure sensor 3 and the second pressure sensor 4. The signal output terminal of the PLC control system 16 is connected to the oil pump 5, the oil inlet separator regulating valve 14, the oil return regulating valve 6 and the control valve 11 respectively. This invention can be controlled manually or automatically, preferably automatically. When the level sensor 12 indicates that the lubricating oil level in the oil-gas separator 2 is lower than a preset threshold, the oil pump 5 and control valve 11 are activated. The lubricating oil in the oil tank 9 enters the pipeline circulation and pressurization unit through the flow meter 10. The flow meter 10 displays the cumulative flow to determine the amount of lubricating oil in the oil tank 9. When the amount of lubricating oil in the oil tank 9 is insufficient, the oil tank can be replaced in time. At the same time, the flow meter 10 and the level sensor 12 work together to enable the oil extraction pipeline unit to accurately extract lubricating oil into the pipeline circulation and pressurization unit, thereby saving oil pump energy consumption. After the lubricating oil enters the pipeline circulation and pressurization unit, the control valve 11 is closed (the oil separator regulating valve 14 is always closed). Lubricating oil is pressurized by oil pump 5 and then enters the bypass pipeline with return oil regulating valve 6 through check valve 7, and then re-enters oil pump 5 for pressurization and circulation. During this circulation process, the pressure gradually increases. When the pressure displayed by the second pressure sensor 4 is greater than the pressure displayed by the first pressure sensor 3, the PLC control system 16 controls the opening of the return oil regulating valve 6 to gradually decrease and the opening of the oil inlet separator regulating valve 14 to gradually increase, until the return oil regulating valve 6 is completely closed and the oil inlet separator regulating valve 14 is completely open. When the level sensor 12 detects that the lubricating oil level in the oil-gas separator 3 reaches a preset threshold, the PLC control system 16 controls the opening of the return oil regulating valve 6 to gradually increase and the opening of the oil inlet separator regulating valve 14 to gradually decrease, until the return oil regulating valve 6 is completely open and the oil inlet separator regulating valve 14 is completely closed. This process can further reduce the labor intensity of on-site operators without stopping the screw compressor 1.

[0026] The specific working process of this utility model is as follows: This utility model is applicable to online lubrication of screw compressor 1. The technical solution is as follows: the oil tank 9 is connected to the first end of the oil extraction pipe 8. The oil extraction pipe 8 draws the lubricating oil in the oil tank 9 into the pipeline circulation pressurization unit, so that the lubricating oil is pressurized during the circulation process in the pipeline circulation pressurization unit. When the pressure displayed in the second pressure sensor 4 is greater than the pressure displayed in the first pressure sensor 3, the lubricating oil in the pipeline circulation pressurization unit enters the oil-gas separator 2, so as to achieve the purpose of replenishing lubricating oil in the screw compressor 1 without stopping. This invention, while constructing a pipeline circulation pressurization unit, also constructs an online lubricating oil circulation pipeline between the screw compressor 1 and the oil-gas separator 2. The lubricating oil is pressurized to its working pressure by the pipeline circulation pressurization unit, and then the pressurized lubricating oil in the pipeline circulation pressurization unit is replenished into the oil-gas separator 2, thus achieving the feature of online replenishment of lubricating oil to the screw compressor 1. This invention can be controlled manually or automatically, using the pressure difference between the first pressure sensor 3 and the second pressure sensor 4 as the timing for lubricating oil compensation. Simultaneously, the level sensor 12 displays the lubricating oil level in the oil-gas separator 2, providing a basis for starting and stopping this invention. Furthermore, in conjunction with the flow meter 10, it can determine the amount of lubricating oil entering the pipeline circulation pressurization unit, thereby reducing the energy loss of the oil pump 5. At the same time, the flow meter 10 can also determine the amount of lubricating oil in the oil tank 9, enabling timely replacement when the amount of lubricating oil in the oil tank 9 is insufficient.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A non-stop refueling device for a screw compressor unit, comprising a screw compressor (1), wherein the oil inlet of the screw compressor (1) is connected to the oil outlet of an oil-gas separator (2) via a pipe, and the oil return port of the screw compressor (1) is connected to the oil return port of the oil-gas separator (2) via a pipe, characterized in that: The oil inlet of the oil-gas separator (2) is connected to the oil extraction pipeline unit through the pipeline circulation pressurization unit; The oil-gas separator (2) is equipped with a first pressure sensor (3), and the pipeline circulation pressurization unit is equipped with a second pressure sensor (4).

2. The non-stop refueling device for a screw compressor unit according to claim 1, characterized in that: The pipeline circulation pressurization unit includes an oil pump (5). The inlet end of the oil pump (5) is connected to the oil extraction pipeline unit through a pipeline, and the outlet end of the oil pump (5) is connected to the oil inlet of the oil-gas separator (2). A short-path pipeline with a return oil regulating valve (6) is provided between the corresponding pipeline at the inlet end of the oil pump (5) and the corresponding pipeline at the outlet end of the oil pump (5); A second pressure sensor (4) is installed on the pipeline between the outlet end of the oil pump (5) and the bypass pipeline.

3. The non-stop refueling device for a screw compressor unit according to claim 2, characterized in that: A check valve (7) is provided between the outlet end of the oil pump (5) and the second pressure sensor (4).

4. A non-stop refueling device for a screw compressor unit according to claim 2, characterized in that: The oil extraction pipeline unit includes an oil extraction pipe (8), the first end of which is connected to the bottom of the oil tank (9), a flow meter (10) is provided in the middle of the oil extraction pipe (8), and a control valve (11) is provided at the end of the oil extraction pipe (8).

5. A non-stop refueling device for a screw compressor unit according to claim 4, characterized in that: The oil-gas separator (2) is equipped with a liquid level sensor (12), and an oil separator shut-off valve (13) and an oil separator regulating valve (14) are provided between the oil inlet of the oil-gas separator (2) and the pipeline circulation pressurization unit.

6. A non-stop refueling device for a screw compressor unit according to claim 5, characterized in that: Both the pipeline circulation pressurization unit and the oil extraction pipeline unit are located inside the housing (15).

7. A non-stop refueling device for a screw compressor unit according to claim 6, characterized in that: A PLC control system (16) is provided on the outer wall of the housing (15). The signal input terminal of the PLC control system (16) is connected to the flow meter (10), the liquid level sensor (12), the first pressure sensor (3) and the second pressure sensor (4). The signal output terminal of the PLC control system (16) is connected to the oil pump (5), the oil inlet separator regulating valve (14), the oil return regulating valve (6) and the control valve (11) respectively.

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