An energy-saving device for recovering lubricating oil leaking from the shaft seal of an oil-injected screw compressor.

Abstract

This utility model relates to the technical field of lubricating oil recovery and energy-saving devices for shaft seal leakage in oil-injected screw compressors. Specifically, it relates to a lubricating oil recovery and energy-saving device for shaft seal leakage in oil-injected screw compressors, including a leakage collection chamber, a screw compressor, a vacuum generator, a one-way valve, and an oil recovery filter assembly. The screw compressor is located on one side of the leakage collection chamber. The one-way valve is connected to the vacuum generator, and the vacuum generator is connected to the screw compressor. The oil recovery filter assembly includes a housing, an oil inlet threaded connector, an oil outlet threaded connector, a breather cap, two oil filters, and a sensing structure. The oil inlet threaded connector is fixedly connected to the housing, and the oil outlet threaded connector is fixedly connected to the housing. The breather cap is located on top of the housing. The oil inlet threaded connector is connected to the leakage collection chamber, and the oil outlet threaded connector is connected to the one-way valve. Through the above structural design, the problem of the existing technology where the lubricating oil content is very small, resulting in a large waste of compressed air and thus a large waste of electrical energy is solved.

Description

Technical Field

[0001] This utility model relates to the technical field of energy-saving devices for recovering and saving lubricating oil leaking from the shaft seal of an oil-injected screw compressor, and in particular to an energy-saving device for recovering and saving lubricating oil leaking from the shaft seal of an oil-injected screw compressor. Background Technology

[0002] Oil-injected screw compressors are essential industrial equipment in fields such as chemical engineering and steelmaking. The screw compressor itself is a core and crucial compression and gas-generating component. The quality and wear resistance of the screw compressor's shaft seal determine whether lubricating oil leaks outside the compressor. When the shaft seal wears and fails, the leakage will be greater, causing the lubricating oil inside the compressor to flow along the shaft and drip onto the central support or base of the equipment, affecting its appearance.

[0003] The current common practice is to make an oil drain hole at the shaft seal end cover, and install a one-way valve and a vacuum generator on the drain hole. Compressed air from the oil-gas separator core is drawn through the negative pressure generated by the vacuum generator to guide the small amount of lubricating oil leaking from the shaft seal to the inlet of the screw compressor.

[0004] This practice has always involved the mixed transportation of oil and gas, with a very small proportion of lubricating oil, resulting in a lot of wasted compressed air and consequently, a significant waste of electrical energy. Utility Model Content

[0005] The purpose of this invention is to provide an energy-saving device for recovering leaking lubricating oil from the shaft seal of an oil-injected screw compressor, which solves the problem of existing technologies where the lubricating oil content is very low, resulting in a large waste of compressed air and thus a significant waste of electrical energy.

[0006] To achieve the above objectives, this utility model provides an energy-saving device for recovering leaking lubricating oil from the shaft seal of an oil-injected screw compressor. The device includes a leakage collection chamber, a screw compressor, a vacuum generator, a one-way valve, and an oil recovery filter assembly. The screw compressor is located on one side of the leakage collection chamber, and the vacuum generator is located on one side of the screw compressor. The one-way valve is connected to the vacuum generator, and the vacuum generator is connected to the screw compressor. The oil recovery filter assembly includes a housing, an inlet threaded connector, an outlet threaded connector, a breather cap, two oil filters, and a sensing structure. The inlet threaded connector is fixedly connected to the housing and located above the housing. The outlet threaded connector is fixedly connected to the housing and located on one side of the housing. The two oil filters are fixedly connected to the housing and are respectively located on both sides of the housing. The breather cap is located above the housing. The sensing structure is located on one side of the housing. The inlet threaded connector is connected to the leakage collection chamber, and the outlet threaded connector is connected to the one-way valve.

[0007] The sensing structure includes a transparent vernier tube, an upper liquid level photosensitive switch, and a lower liquid level photosensitive switch. The transparent vernier tube is fixedly connected to the housing and located on one side of the housing. The upper liquid level photosensitive switch is located at the upper end of the transparent vernier tube, and the lower liquid level photosensitive switch is located at the lower end of the transparent vernier tube.

[0008] The oil-injected screw compressor shaft seal leakage lubricating oil recovery and energy-saving device also includes an electric valve, which is connected to the vacuum generator.

[0009] The oil-injected screw compressor shaft seal leakage lubricating oil recovery and energy-saving device further includes an oil filtration system, an oil-gas separation system, a minimum pressure valve, a temperature control valve, an aftercooler, and an oil cooler. The oil filtration system is connected to the screw compressor, the oil-gas separation system is connected to the electric valve, the minimum pressure valve is connected to both the oil-gas separation system and the aftercooler, the temperature control valve is connected to the oil filtration system, the oil-gas separation system, and the oil cooler, and the oil cooler is connected to the aftercooler.

[0010] The oil-injected screw compressor shaft seal leakage lubricating oil recovery and energy-saving device also includes an air-cooled permanent magnet variable frequency motor and a coupling transmission system, wherein the coupling transmission system is connected to the screw compressor and the air-cooled permanent magnet variable frequency motor respectively.

[0011] This utility model discloses an energy-saving device for recovering leaking lubricating oil from the shaft seal of an oil-injected screw compressor. The inlet threaded connector is fixedly connected to the housing and located above it. The outlet threaded connector is fixedly connected to the housing and located on one side of it. Two oil filters are fixedly connected to the housing and respectively disposed on both sides of the housing. A breather cap is disposed above the housing. A sensing structure is disposed on one side of the housing. The inlet threaded connector is connected to the leakage collection chamber, and the outlet threaded connector is connected to the one-way valve. Lubricating oil leaking from the shaft seal of the screw compressor flows into the interior of the housing due to gravity. Compressed air, through a vacuum generator, generates negative pressure to guide the lubricating oil stored in the housing into the oil inlet. The breather cap facilitates the easier return of any leaking lubricating oil to the air inlet of the screw compressor. The oil filters filter the stored lubricating oil using an inward-inward-outward method. Attached Figure Description

[0012] 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.

[0013] Figure 1 This is a schematic diagram of the structure of the energy-saving device for recovering leaking lubricating oil from the shaft seal of an oil-injected screw compressor according to this utility model.

[0014] Figure 2 This is a partial structural schematic diagram of the present invention.

[0015] Figure 3 This is a schematic diagram of the structure of the oil recovery filter assembly of this utility model.

[0016] 1-Air-cooled permanent magnet variable frequency motor, 2-Screw compressor, 3-Coupling transmission system, 4-Intake filter system, 5-Minimum pressure valve, 6-Aftercooler, 7-Oil-gas separation system, 8-Temperature control valve, 9-Oil cooler, 10-Oil filtration system, 11-Oil filter, 12-Collection chamber, 13-One-way valve, 14-Vacuum generator, 15-Electric valve, 16-Oil recovery filter assembly, 17-Inlet threaded connector, 18-Outlet threaded connector, 19-Breathe cap, 20-Upper liquid level photosensitive switch, 21-Lower liquid level photosensitive switch, 22-Transparent oil level indicator tube, 23-Housing shell. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0018] Please see Figures 1 to 3This utility model provides an energy-saving device for recovering leaking lubricating oil from the shaft seal of an oil-injected screw compressor. It includes a leakage collection chamber 12, a screw compressor 2, a vacuum generator 14, a one-way valve 13, and an oil recovery filter assembly 16. The screw compressor 2 is located on one side of the leakage collection chamber 12, and the vacuum generator 14 is located on one side of the screw compressor 2. The one-way valve 13 is connected to the vacuum generator 14, and the vacuum generator 14 is connected to the screw compressor 2. The oil recovery filter assembly 16 includes a housing 23, an oil inlet threaded connector 17, an oil outlet threaded connector 18, a breather cap 19, and two oil... The system includes a filter 24 and a sensing structure. The oil inlet threaded connector 17 is fixedly connected to the housing 23 and located above the housing 23. The oil outlet threaded connector 18 is fixedly connected to the housing 23 and located on one side of the housing 23. Two oil filters 24 are fixedly connected to the housing 23 and are respectively disposed on both sides of the housing 23. The breather cap 19 is disposed above the housing 23. The sensing structure is disposed on one side of the housing 23. The oil inlet threaded connector 17 is connected to the leakage collection chamber 12. The oil outlet threaded connector 18 is connected to the one-way valve 13.

[0019] In this embodiment, the lubricating oil leaking from the screw compressor 2 through the shaft seal flows into the interior of the housing 23 by gravity. Compressed air generates negative pressure through the vacuum generator 14 to guide the lubricating oil stored in the housing 23 into the oil inlet. The breather cap 19 is designed to make it easier for any lubricating oil to be drawn back to the air inlet of the screw compressor 2. The oil filter 24 filters the stored lubricating oil according to the method of internal inflow and external outflow.

[0020] Furthermore, the sensing structure includes a transparent vernier tube, an upper liquid level photosensitive switch 20, and a lower liquid level photosensitive switch 21. The transparent vernier tube is fixedly connected to the housing 23 and is located on one side of the housing 23. The upper liquid level photosensitive switch 20 is disposed at the upper end of the transparent vernier tube, and the lower liquid level photosensitive switch 21 is disposed at the lower end of the transparent vernier tube.

[0021] In this embodiment, as the communicating vessels move away from each other, lubricating oil enters the interior of the transparent vernier tube, and the upper liquid level photosensitive switch 20 and the lower liquid level photosensitive switch 21 respectively sense and emit signals corresponding to the amount of oil.

[0022] Furthermore, the oil-injected screw compressor shaft seal leakage lubricating oil recovery and energy-saving device also includes an electric valve 15, which is connected to the vacuum generator 14.

[0023] In this embodiment, the electrical system is controlled by a PLC control and display system 11. When the oil level reaches the upper liquid level photosensitive switch 20, the PLC control and display system 11 signals the electric valve 15 to inject compressed air into the vacuum generator 14. When the oil level reaches the lower liquid level photosensitive switch, the electric valve 15 closes, and oil pumping stops.

[0024] Furthermore, the oil-injected screw compressor shaft seal leakage lubricating oil recovery and energy-saving device also includes an oil filtration system 10, an oil-gas separation system 7, a minimum pressure valve 5, a temperature control valve 8, an aftercooler 6, and an oil cooler 9. The oil filtration system 10 is connected to the screw compressor 2, the oil-gas separation system 7 is connected to the electric valve 15, the minimum pressure valve 5 is connected to both the oil-gas separation system 7 and the aftercooler 6, the temperature control valve 8 is connected to the oil filtration system 10, the oil-gas separation system 7, and the oil cooler 9, and the oil cooler 9 is connected to the aftercooler 6.

[0025] In this embodiment, the aftercooler 6 and the oil cooler 9 reduce the system temperature, and the oil-gas separation system 7 separates the oil-gas mixture generated during the compression process to ensure the quality of the compressed air.

[0026] Furthermore, the oil-injected screw compressor shaft seal leakage lubricating oil recovery and energy-saving device also includes an air-cooled permanent magnet variable frequency motor 1 and a coupling transmission system 3, wherein the coupling transmission system 3 is connected to the screw compressor 2 and the air-cooled permanent magnet variable frequency motor 1 respectively.

[0027] In this embodiment, the coupling transmission system 3 connects the air-cooled permanent magnet variable frequency motor 1 and the screw host 2, and the air-cooled permanent magnet variable frequency motor 1 provides kinetic energy to the screw host 2.

[0028] 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. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. An energy-saving device for recovering leaking lubricating oil from the shaft seal of an oil-injected screw compressor, comprising a leakage collection chamber, a screw compressor main unit, a vacuum generator, and a one-way valve, wherein the screw compressor main unit is disposed on one side of the leakage collection chamber, the vacuum generator is disposed on one side of the screw compressor main unit, the one-way valve is connected to the vacuum generator, and the vacuum generator is connected to the screw compressor main unit, characterized in that, It also includes an oil recovery filtration assembly, which includes a housing, an inlet threaded connector, an outlet threaded connector, a breather cap, two oil filters, and a sensing structure. The inlet threaded connector is fixedly connected to the housing and located above the housing. The outlet threaded connector is fixedly connected to the housing and located on one side of the housing. The two oil filters are fixedly connected to the housing and respectively disposed on both sides of the housing. The breather cap is disposed above the housing. The sensing structure is disposed on one side of the housing. The inlet threaded connector is connected to the leakage collection chamber, and the outlet threaded connector is connected to the one-way valve.

2. The energy-saving device for recovering and saving lubricating oil leaking from the shaft seal of an oil-injected screw compressor as described in claim 1, characterized in that, The sensing structure includes a transparent vernier tube, an upper liquid level photosensitive switch, and a lower liquid level photosensitive switch. The transparent vernier tube is fixedly connected to the housing and located on one side of the housing. The upper liquid level photosensitive switch is located at the upper end of the transparent vernier tube, and the lower liquid level photosensitive switch is located at the lower end of the transparent vernier tube.

3. The oil-injected screw compressor shaft seal leakage lubricating oil recovery and energy-saving device as described in claim 2, characterized in that, The oil-injected screw compressor shaft seal leakage lubricating oil recovery and energy-saving device also includes an electric valve, which is connected to the vacuum generator.

4. The oil-injected screw compressor shaft seal leakage lubricating oil recovery and energy-saving device as described in claim 3, characterized in that, The oil-injected screw compressor shaft seal leakage lubricating oil recovery and energy-saving device also includes an oil filtration system, an oil-gas separation system, a minimum pressure valve, a temperature control valve, an aftercooler, and an oil cooler. The oil filtration system is connected to the screw compressor, the oil-gas separation system is connected to the electric valve, the minimum pressure valve is connected to both the oil-gas separation system and the aftercooler, the temperature control valve is connected to the oil filtration system, the oil-gas separation system, and the oil cooler, and the oil cooler is connected to the aftercooler.

5. The oil-injected screw compressor shaft seal leakage lubricating oil recovery and energy-saving device as described in claim 4, characterized in that, The oil-injected screw compressor shaft seal leakage lubricating oil recovery and energy-saving device also includes an air-cooled permanent magnet variable frequency motor and a coupling transmission system, wherein the coupling transmission system is connected to the screw compressor and the air-cooled permanent magnet variable frequency motor respectively.

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