Shaft seal oil return structure of a screw supercharger

Abstract

The embodiments of this application provide a shaft seal oil return structure for a screw compressor, including an oil return pipeline and a pneumatic control pipeline. The oil return pipeline connects the shaft seal oil return point of the screw compressor to the system air inlet, and the pneumatic control pipeline connects a high-pressure control air source to the space between two one-way valves on the oil return pipeline. Oil droplets dripping from the shaft seal can accumulate between the two one-way valves under gravity, and then be automatically recovered into the machine to participate in the system circulation under the pressure difference between the high-pressure control air source and the system air inlet. This can reduce the additional operation and maintenance time of operators, reduce manual maintenance costs, reduce operational safety hazards and environmental pollution.

Description

Technical Field

[0001] This utility model relates to the field of screw compressors, specifically to a shaft seal oil return structure for a screw compressor. Background Technology

[0002] In general, the oil return from the shaft seal of a screw compressor requires the placement of an oil collection tray at the dripping point to collect the dripping oil droplets, or the oil droplets to be led to the drain outlet outside the machine casing via a connecting pipeline. This requires regular handling by operators. If the handling is not timely or appropriate, it may cause pollution inside the machine casing or in the environment, increasing safety hazards. Utility Model Content

[0003] In view of this, the embodiments of this utility model provide a shaft seal oil return structure for a screw supercharger to reduce manual maintenance costs, minimize operational safety hazards, and reduce environmental pollution.

[0004] This utility model provides a shaft seal oil return structure for a screw compressor, including an oil return pipeline and a pneumatic control pipeline; the two ends of the oil return pipeline are respectively connected to the shaft seal oil return point of the screw compressor and the system air inlet, and two one-way valves that unidirectionally flow towards the system air inlet are installed on the oil return pipeline;

[0005] A solenoid valve is installed on the pneumatic control pipeline. One end of the pneumatic control pipeline is connected to a high-pressure control air source, and the other end of the pneumatic control pipeline is connected between the two check valves.

[0006] Optionally, the solenoid valve is configured to periodically connect the high-pressure control gas source to the two check valves at set times.

[0007] Optionally, the solenoid valve is a two-position three-way solenoid valve, and the three ports of the two-position three-way solenoid valve are respectively connected to the high-pressure control air source, between the two check valves, and the atmosphere.

[0008] Optionally, one end of the pneumatic control line is connected to the system exhaust port of the screw compressor.

[0009] The present invention has the following beneficial effects: by connecting the screw press shaft seal oil return point and the system air inlet through the oil return pipeline, and by connecting the high-pressure control air source to the two one-way valves on the oil return pipeline through the pneumatic control pipeline, the oil droplets dripping from the shaft seal can be collected between the two one-way valves under the action of gravity, and then automatically recovered into the machine to participate in the system circulation under the pressure difference between the high-pressure control air source and the system air inlet. This can reduce the additional operation and maintenance time of operators, reduce the cost of manual maintenance, reduce operational safety hazards and environmental pollution. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0012] The numbers in the diagram represent:

[0013] 1. Oil return line; 2. Pneumatic control line; 3. Shaft seal oil return point; 4. System air inlet; 5. Check valve; 6. High-pressure control air source; 7. Two-position three-way solenoid valve. Detailed Implementation

[0014] 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.

[0015] Please see Figure 1 As shown, an embodiment of this utility model provides a shaft seal oil return structure for a screw compressor, including an oil return pipeline 1 and a pneumatic control pipeline 2. The two ends of the oil return pipeline 1 are connected to the shaft seal oil return point 3 (atmospheric pressure) and the system air inlet 4 (low pressure) of the screw compressor, respectively. Two one-way valves 5 are installed on the oil return pipeline 1, both of which are unidirectionally open towards the system air inlet 4. Oil droplets dripping from the shaft seal can accumulate between the two one-way valves 5 under gravity.

[0016] A solenoid valve is installed on the pneumatic control line 2. One end of the pneumatic control line 2 is connected to the high-pressure control air source 6 (high pressure), and the other end is connected to the space between two one-way valves 5. This allows oil droplets that accumulate between the two one-way valves 5 to be automatically recovered into the machine and participate in the system circulation under the action of pressure difference. Specifically, one end of the pneumatic control line 2 can be directly connected to the system exhaust port of the screw compressor, using the high-pressure gas discharged from the system exhaust port as the control air.

[0017] Furthermore, the solenoid valve can be configured to periodically connect the high-pressure control air source 6 to the two one-way valves 5 at set times, thereby automatically recovering the collected oil droplets into the machine through the pressure difference.

[0018] Specifically, in this embodiment of the invention, the solenoid valve is a two-position three-way solenoid valve 7. The three ports of the two-position three-way solenoid valve 7 are respectively connected to the high-pressure control air source 6, between the two check valves 5, and to the atmosphere. The two-position three-way solenoid valve 7 can periodically connect the high-pressure control air source 6 to the two check valves 5 according to a set time. Through the pressure difference, the oil droplets accumulated between the two check valves 5 are discharged into the system air inlet 4. After the oil discharge is completed, the two-position three-way solenoid valve 7 returns to its original position, closing the high-pressure control air source 6 and releasing the pressure between the two check valves 5 to the atmosphere, making it convenient to collect the dripping oil droplets again.

[0019] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this utility model. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A shaft seal oil return structure for a screw compressor, characterized in that: It includes an oil return line and a pneumatic control line; the two ends of the oil return line are respectively connected to the shaft seal oil return point of the screw compressor and the air inlet of the system, and two one-way valves that unidirectionally flow towards the air inlet of the system are installed on the oil return line; A solenoid valve is installed on the pneumatic control pipeline. One end of the pneumatic control pipeline is connected to a high-pressure control air source, and the other end of the pneumatic control pipeline is connected between the two check valves.

2. The shaft seal oil return structure of a screw compressor according to claim 1, characterized in that: The solenoid valve is configured to periodically connect the high-pressure control gas source to the two check valves at set times.

3. The shaft seal oil return structure of a screw compressor according to claim 1, characterized in that: The solenoid valve is a two-position three-way solenoid valve, and the three ports of the two-position three-way solenoid valve are respectively connected to the high-pressure control air source, between the two check valves, and the atmosphere.

4. The shaft seal oil return structure of a screw compressor according to claim 1, characterized in that: One end of the pneumatic control pipeline is connected to the system exhaust port of the screw compressor.

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