Oil supply device of skid-mounted compressor

Abstract

The invention relates to the technical field of oil supply equipment, and discloses an oil supply device of a skid-mounted compressor, an oil tank is arranged on a rack, oil is controlled through a main pump and an auxiliary pump, the oil tank is provided with an oil tank partition plate, and the oil tank is divided into an oil inlet partition cavity, a defoaming area, an oil cooling area and an oil supply area through the oil tank partition plate; oil in an oil supply area in the oil tank is controlled by the pump to flow out through an oil tank oil outlet formed in the oil tank and flows into the safety valve and the cooler, and when the pressure of the safety valve at a pump outlet pipeline exceeds a safety threshold value, part of oil in front of the safety valve can flow back into the oil inlet partition cavity through a safety valve oil return opening connected with the oil tank; oil liquid flows into the double-cylinder filter to be filtered after heat exchange is completed, then flows into equipment needing oil supply for lubrication and flows into the oil inlet partition cavity through an oil tank oil return opening formed in the oil tank after lubrication is completed, the oil inlet partition cavity is communicated with the defoaming area through the magnetic oil return filter, and the magnetic oil return filter can adsorb scrap iron in the oil liquid.

Description

Technical Field

[0001] The present invention relates to the technical field of oil supply equipment, and particularly to an oil supply device for a skid-mounted compressor. Background Art

[0002] The oil supply device is a circulating and regenerating oil supply device for forced lubrication and cooling of the main engine, and has the characteristics of centralized layout, stable appearance, convenient operation, etc. Based on the special needs of the high rotational speed and variable load of the main engine operation, this oil station provides a continuous, stable, and constant-temperature lubricating and control medium for it, so that it can be reasonably lubricated and cooled, extend the service life of the bearing, reduce the maintenance cost of the main engine, and thus ensure the long-term stable operation of the main engine.

[0003] Skid-mounted is an integrated equipment design method that integrates functional components on an overall base to achieve rapid installation and migration. The skid-mounted oil supply device is to install the oil supply equipment and the equipment to be oil-supplied on the upper part of the base in a detachable connection manner. The oil supply device for skid-mounted equipment needs to have a certain adjustment ability because the oil needs to continuously circulate in the oil supply device and the equipment, and the oil supply device needs to have a certain adjustment ability and filtration ability. There are metal iron filings dropped due to wear in the equipment lubrication area. If not cleaned in time in the oil, it may damage other equipment in the oil supply device. Summary of the Invention

[0004] (1) Technical problems to be solved: Aiming at the deficiencies of the prior art, the present invention provides an oil supply device for a skid-mounted compressor, which has the advantages of protecting the pipeline by repeatedly circulating the oil, and solves the problem of oil circulation in a closed device.

[0005] (2) Technical solutions: To achieve the purpose of repeatedly circulating the oil to protect the pipeline, the present invention provides the following technical solutions: An oil supply device for a skid-mounted compressor, including a frame, a fuel tank, a safety valve, a cooler, and a double-barrel filter. The fuel tank is arranged on the frame, and the oil in the fuel tank is controlled by a main pump and an auxiliary pump. The fuel tank is provided with a fuel tank partition, and the fuel tank is divided into an oil inlet partition chamber, a defoaming area, a cold oil area, and an oil supply area through the fuel tank partition. The oil in the fuel tank located in the oil supply area flows out under the control of a pump through an oil outlet of the fuel tank, and flows into the safety valve and the cooler respectively. When the pressure in the pipeline at the pump outlet exceeds the safety valve value, a part of the oil before the safety valve can flow back to the oil inlet partition chamber through a safety valve oil return port connected to the fuel tank. The cooler is a tubular heat exchanger. After the oil heat exchange is completed, it flows into the double-barrel filter for filtration, and then flows into the equipment that needs to be lubricated with oil. After lubrication, it flows into the oil inlet partition chamber through an oil return port of the fuel tank. The oil inlet partition chamber and the defoaming area are connected through a magnetic oil return filter, and the magnetic oil return filter can adsorb iron filings in the oil.

[0006] A cooler temperature control valve is provided beside the cooler. When the oil in the oil tank flows out, part of it flows into the cooler and part flows into the cooler temperature control valve.

[0007] Maintenance valves are provided on both sides of the cooler temperature control valve.

[0008] An accumulator is provided on the pipeline connecting the double-barrel filter and the equipment that needs to be lubricated with oil. The accumulator can instantaneously maintain the oil pressure for at least 4 s to ensure the safety of the main engine.

[0009] A heater for heating the oil supply is provided in the cold oil area.

[0010] The magnetic return oil filter is integrally cylindrical. The upper end is communicated with the oil inlet separation chamber, and the lower end is communicated with the defoaming area. In the magnetic return oil filter, annular guide vanes and adsorption magnetic groups for adsorbing iron filings are arrayed along the axis from top to bottom.

[0011] The distance between the annular guide vanes gradually increases from top to bottom, and the oil forms a spiral downward flow in the magnetic return oil filter.

[0012] The adsorption magnetic group is divided into a first magnetic pole group, a second magnetic pole group and a third magnetic pole group, and their magnetic field intensities are different. In the magnetic return oil filter, from top to bottom are the first magnetic pole group, the second magnetic pole group and the third magnetic pole group. The magnetic field intensity of the second magnetic pole group is the largest, and the magnetic field intensity of the third magnetic pole group is the smallest. Each group in the adsorption magnetic group has 6 magnetic poles arranged in a circumferential array, and the N and S poles are arranged alternately.

[0013] A magnetic ring is provided at the bottom outlet of the magnetic return oil filter. The magnetic ring is close to the inner wall of the magnetic return oil filter, and a slope is provided inside the magnetic ring. The slope is an upward convex inclined plane.

[0014] A handle is provided on the magnetic return oil filter.

[0015] (3) Beneficial effects: Compared with the prior art, the present invention provides an oil supply device for a skid-mounted compressor, which has the following beneficial effects: 1. In the oil supply device of the skid-mounted compressor, the oil tank is intelligently divided into an oil inlet chamber, a defoaming area, a cold oil area and an oil supply area by a partition, forming a progressive process for oil treatment. The return oil is first adsorbed by iron filings through a magnetic filter to intercept worn metal particles, and then enters the defoaming area to slow down the flow rate and separate bubbles, avoiding cavitation damage to the oil pump. The heater equipped in the cold oil area precisely adjusts the viscosity of the oil to ensure stable lubrication performance in low-temperature environments. The oil supply area centrally outputs clean oil, which is shunted to the safety valve and the cooler after being jointly controlled by the main and auxiliary pumps. The safety valve automatically relieves pressure and returns oil when the pressure exceeds the limit, realizing oil circulation and reuse while protecting the pipeline. The linkage design of the cooler and the temperature control valve not only dissipates heat efficiently through tube heat exchange, but also dynamically adjusts the bypass oil volume, accurately controlling the outlet oil temperature at 46-48°C, avoiding energy waste caused by excessive cooling and preventing the lubrication effect from being affected by oil temperature fluctuations. The redundant configuration of the double-barrel filter supports online switching. Combined with the front interception of the magnetic filter, the service life of the filter element is greatly extended. The maintenance valve provided beside the cooler temperature control valve enables fault handling without shutting down the machine. The oil in the system continuously undergoes multi-stage treatments such as magnetic adsorption, fine filtration and purification, sedimentation and stratification, and temperature equilibrium, forming a closed-loop self-cleaning mechanism, effectively separating iron filings, bubbles and even trace amounts of moisture. The compact partition integrated design realizes the composite functions of defoaming, heating and sedimentation in a limited space. Combined with the side-by-side layout of the tube cooler and the filter, the equipment footprint is significantly optimized. In addition, the suppression of turbulence in the defoaming area reduces the operating noise, and the partition structure disperses the impact energy of the oil. The intelligent switching of the main and auxiliary pumps and the environmental adaptability of the temperature control system ensure that the system can still stably output under extreme working conditions from -20°C to 50°C, finally achieving the core advantages of low maintenance cost, long-term operation and high energy efficiency ratio, providing a lasting and reliable lubrication guarantee for the compressor.

[0016] 2. The oil supply device of the skid-mounted compressor adopts a layout with gradually changing spacing of annular guide vanes from top to bottom, forming a high-speed flow channel in the inlet section. By means of accelerating the oil flow to scour, it avoids the accumulation of iron filings at the inlet, and at the same time quickly brings large iron filings into the deep area. When reaching the outlet section, the spacing of the guide vanes expands, and the flow velocity naturally decays, providing sufficient action time for magnetic adsorption. The three axially distributed magnetic pole groups adopt a differential magnetic field intensity gradient (strong → strongest → weak) and an alternating arrangement of circumferential N / S poles, constructing a three-dimensional magnetic field trap in space. The axial "wavy" magnetic field forces the iron filings to migrate to the high magnetic field strength area, and the radial "funnel-shaped" magnetic field gathers the particles towards the center, forming a three-dimensional capture effect, greatly improving the adsorption efficiency of suspended iron filings. The magnetic ring at the bottom and the slope structure form a secondary interception barrier. In the oil flow deceleration area, through the synergistic action of magnetic suction and inclined plane blockage, the escaped fine iron filings are adsorbed by the magnetic ring and accumulate along the slope, preventing them from returning to the oil circulation. The overall structure realizes the dynamic matching of the flow velocity field and the magnetic field intensity, not only solving the pain point of easy blockage of traditional magnetic filters, but also using the gradient magnetic field to achieve hierarchical capture from coarse particles to ultra-fine iron filings. Combined with the original hot and cold oil zoning and double-barrel filtration of the system, it forms a multi-level linkage purification network, significantly extending the filter element life and reducing the maintenance frequency.

[0017] 3. The oil supply device of the skid-mounted compressor has an accumulator connected in series to the outlet pipeline of the double-barrel filter. Its airbag structure stores hydraulic energy during normal operation. When the main pump switches or sudden pressure fluctuations occur, it can instantaneously release the stored oil fluid, continuously maintaining a safe oil pressure for more than 4 seconds, effectively filling the time difference for the auxiliary pump to start, and avoiding dry friction of key components such as bearings due to pressure loss during the switching moment. The dynamic absorption ability of the accumulator for pressure pulsation can suppress the hydraulic shock caused by sudden changes in load, protecting precision valve parts from damage caused by pressure oscillation. The built-in shell-and-tube heater in the cold oil area and the temperature control valve of the cooler form a two-way temperature control closed loop. The heating rod conducts heat indirectly through the shell, avoiding carbonization of the oil fluid caused by local overheating, and accurately raising the oil fluid temperature in a low-temperature environment, maintaining the viscosity in the optimal lubrication range, preventing both the delay in the formation of the oil film during cold start and the energy consumption waste caused by over-reliance on the cooler in high-temperature seasons. These two improvements are deeply integrated with the magnetic filter and the partitioned oil tank of the original system. The magnetic filter preferentially intercepts iron filings to reduce the wear of subsequent components, the accumulator ensures pressure continuity, the heater and the cooler cooperate to maintain the thermal balance of the oil fluid, supplemented by the redundant filtration of the double-barrel filter, jointly constructing an all-round protection system from pressure buffering, temperature adaptation to impurity removal, significantly improving the operation reliability of the compressor under variable load and wide temperature range conditions, and at the same time extending the service life of the core components. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the present invention Figure One 。

[0019] Figure 2Schematic diagram of the structure of the present invention Figure Two 。

[0020] Figure 3 Schematic diagram of the structure of the present invention Figure Three 。

[0021] Figure 4 Schematic diagram of the structure of the present invention Figure Four 。

[0022] Figure 5 Schematic diagram of the structure of the magnetic oil return filter of the present invention.

[0023] Figure 6 Schematic diagram of the section of the magnetic oil return filter of the present invention.

[0024] Figure 7 Schematic diagram of the setting of the adsorption magnetic group of the present invention.

[0025] Figure 8 Schematic diagram of the details of the temperature control valve and the maintenance valve of the present invention.

[0026] In the figure: 1, frame; 2, fuel tank; 3, magnetic oil return filter; 4, safety valve; 5, cooler; 6, double - barrel filter; 7, accumulator; 21, fuel tank oil outlet; 22, fuel tank oil return port; 31, annular guide vane; 32, magnetic ring; 33, slope; 34, adsorption magnetic group; 41, safety valve oil return port; 51, cooler temperature control valve; 201, oil inlet partition chamber; 202, cold oil area; 203, fuel tank partition; 2021, heater; 301, handle; 311, first magnetic pole group; 312, second magnetic pole group; 313, third magnetic pole group. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0028] Please refer to Figures 1-4, The oil supply device of the skid-mounted compressor includes a frame 1, an oil tank 2, a safety valve 4, a cooler 5 and a double-barrel filter 6. The oil tank 2 is arranged on the frame 1. The oil in the oil tank 2 is controlled by a main pump and an auxiliary pump. The oil tank 2 is provided with an oil tank partition 203, and the oil tank 2 is separated into an oil inlet partition chamber 201, a defoaming area, a cold oil area 202 and an oil supply area through the oil tank partition 203. The oil in the oil supply area of the oil tank 2 flows out under the control of a pump through an oil tank outlet 21 provided on the oil tank 2 and flows into the safety valve 4 and the cooler 5 respectively. When the pressure in the pump outlet pipeline exceeds the safety valve value, a part of the oil in front of the safety valve 4 can flow back to the oil inlet partition chamber 201 through a safety valve oil return port 41 connected to the oil tank 2. The cooler 5 is a tubular heat exchanger. After the oil exchanges heat, it flows into the double-barrel filter 6 for filtration and then flows into the equipment that needs oil supply and lubrication. After lubrication, it flows into the oil inlet partition chamber 201 through an oil tank oil return port 22 provided on the oil tank 2. The oil inlet partition chamber 201 and the defoaming area are connected through a magnetic oil return filter 3, and the magnetic oil return filter 3 can adsorb iron filings in the oil.

[0029] Refer to Figure 8 , A cooler temperature control valve 51 is provided beside the cooler 5. When the oil in the oil tank 2 flows out, part of it flows into the cooler 5 and part flows into the cooler temperature control valve 51. Maintenance valves are provided on both sides of the cooler temperature control valve 51. When the temperature control valve fails, it can be repaired online. By closing the maintenance valves for the inlet and outlet oil circuits of the temperature control valve, the temperature control valve can be disassembled.

[0030] The oil enters the oil inlet partition chamber 201 of the oil tank 2 through the oil tank oil return port 22 and the safety valve oil return port 41. After the oil is filtered by impurities and iron filings through the magnetic oil return filter 3, it flows out of the oil inlet partition chamber 201. After the dead zone for defoaming the oil supply liquid is separated by the oil tank partition 203 in the oil tank 2, it enters the cold oil area 202 and is heated by a heater 2021. The oil in the oil tank 2 flows out from the oil tank outlet 21 through a pump, passes through a check valve and enters the safety valve 4 and the cooler 5. When the pressure in the pump outlet pipeline reaches or exceeds the set pressure of the safety valve 4, which is 0.66 MPa, the safety valve 4 spool lifts upward against the spring resistance inside the valve. A part of the oil in front of the safety valve 4 is discharged back to the oil inlet partition chamber 201 of the oil tank through the safety valve oil return port 41, so as to reduce the oil pressure in front of the safety valve. The remaining part of the oil exchanges heat with the cooler 5, and part passes through the cooler temperature control valve 51 to ensure that the oil temperature at the outlet of the cooler temperature control valve 51 is controlled at 46 - 48 °C. It enters the double-barrel filter 6, and after filtration, it is supplied to the equipment that needs oil injection and lubrication. After normal oil supply, a layer of oil film is formed on the friction surface of the main engine bearing by the lubricating oil, so that the relative moving pairs are lubricated, and the heat and worn metal particles between the moving pairs are taken away. Then it returns to the oil tank 2 through the oil return pipeline beside the machine, and after being filtered, precipitated and cooled in the oil tank 2, it is sucked out by the oil pump again, thus forming a circulating system.

[0031] An accumulator 7 is provided on the pipeline connecting the double-barrel filter 6 to the equipment that requires oil supply and lubrication. The accumulator 7 can instantaneously maintain the oil pressure for at least 4 s to ensure the safety of the main engine. When supplying oil normally, it stores energy. The oil pressure pushes the internal airbag to contract, compresses the internal nitrogen gas, and converts the hydraulic energy into gas potential energy for storage. When the system pressure fluctuates (such as load changes), the accumulator automatically absorbs or releases energy to maintain pressure stability. When the main engine stops or the main pump fails, there is a short delay in starting the auxiliary pump (gear pump). When the system pressure drops below the pre-charged pressure of the airbag, the airbag expands, quickly pushes the stored oil back into the oil supply pipeline, and the released oil compensates the system pressure, keeping the oil supply pressure greater than the minimum safety value for more than 4 s to ensure that the bearing lubrication is not interrupted during the start-up of the auxiliary pump. When the gear pump reaches the rated pressure, the system resumes stable oil supply. The oil output by the auxiliary pump enters the accumulator again to compress the airbag, preparing for the next switch or pressure fluctuation.

[0032] A heater 2021 for heating the oil supply is provided in the cold oil area 202. The heater 2021 is a heating rod and is provided with a casing on the outside.

[0033] Refer to Figures 5-7 , the magnetic return oil filter 3 is integrally cylindrical, the upper end is communicated with the oil inlet separation chamber 201, and the lower end is communicated with the defoaming area. Annular guide vanes 31 and adsorption magnetic groups 34 for adsorbing iron filings are arrayed along the axis from top to bottom in the magnetic return oil filter 3. The distance between the annular guide vanes 31 gradually increases from top to bottom, and the oil forms a spiral downward flow in the magnetic return oil filter 3. The adsorption magnetic groups 34 are divided into a first magnetic pole group 311, a second magnetic pole group 312, and a third magnetic pole group 313, and the magnetic field intensities are different. In the magnetic return oil filter 3, the first magnetic pole group 311, the second magnetic pole group 312, and the third magnetic pole group 313 are arranged from top to bottom, and the magnetic field intensity of the second magnetic pole group 312 is the largest, and the magnetic field intensity of the third magnetic pole group 313 is the smallest. Each group in the adsorption magnetic group 34 is provided with 6 magnetic poles arranged in a circumferential array, and the N and S poles are arranged alternately.

[0034] The annular flow guide piece 31 with gradually changing spacing causes the flow velocity of the oil to change when passing through the magnetic oil return filter 3. The oil just entering the magnetic oil return filter 3 is affected by the spacing of the annular flow guide piece 31, and the flow velocity increases, so that a large amount of iron filings are carried by the flowing oil and accelerated to move downward, avoiding siltation and blockage at the inlet of the magnetic oil return filter 3. When approaching the outlet, the flow velocity slows down, which is convenient for the adsorption magnetic group 34 to adsorb iron filings. And due to the different magnetic field intensities of the first magnetic pole group 311, the second magnetic pole group 312 and the third magnetic pole group 313, when observed from the side direction, the magnetic field strength alternates, like continuous valleys and peaks. And the 6 magnetic poles are arranged in a circular array, and the N and S poles are arranged alternately, so that when observed axially, the magnetic field gradually increases from the center to the edge, like the slope of a funnel, and the iron filings will be adsorbed to the central area with the strongest magnetic field, forming a three-dimensional magnetic trap effect.

[0035] A magnetic ring 32 is provided at the bottom outlet of the magnetic oil return filter 3. The magnetic ring 32 is close to the inner wall of the magnetic oil return filter 3. A slope 33 is provided inside the magnetic ring 32. The slope 33 is an upward convex inclined surface. The fine iron filings are affected more by the oil flow than by the magnetic adsorption. By providing the magnetic ring 32 and the slope 33 at the bottom outlet, while the oil flow velocity is reduced, the fine iron filings are attracted by the magnetic ring 32 and blocked by the slope 33, so that they stay on the magnetic ring 32.

[0036] A handle 301 is provided on the magnetic oil return filter 3, which is convenient to lift the magnetic oil return filter 3 during cleaning.

[0037] Working principle: The oil passes through the oil tank oil return port 22 and the safety valve oil return port 41 and enters the oil inlet partition chamber 201 of the oil tank 2. The oil flows out of the oil inlet partition chamber 201 after being filtered by impurities and iron filings through the magnetic oil return filter 3. After the dead zone for oil defoaming is separated by the oil tank partition 203 in the oil tank 2, it enters the cold oil area 202 and is heated by the heater 2021. The oil in the pump oil tank 2 flows out from the oil tank oil outlet 21, passes through the check valve and enters the safety valve 4 and the cooler 5. When the pressure of the pump outlet pipeline reaches or exceeds the set pressure of the safety valve 4, which is 0.66 MPa, the safety valve 4 spool lifts upward against the spring resistance in the valve. A part of the oil in front of the safety valve 4 is discharged back to the oil inlet partition chamber 201 of the oil tank through the safety valve oil return port 41, so as to reduce the oil pressure in front of the safety valve. The rest of the oil exchanges heat with the cooler 5, and part of it passes through the cooler temperature control valve 51 to ensure that the oil temperature at the outlet of the cooler temperature control valve 51 is controlled at 46 - 48 °C and enters the double-tube filter 6. After being filtered, it is supplied to the equipment that needs oil injection and lubrication. After normal oil supply, a layer of oil film is formed on the friction surface of the main engine bearing by the lubricating oil, so that the relative moving pairs are lubricated, and the heat and worn metal particles between the moving pairs are carried away and then return to the oil tank 2 through the side oil return pipeline. After being filtered, precipitated and cooled in the oil tank 2, it is sucked out by the oil pump again, and thus a circulation system is formed.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil supply device for a skid-mounted compressor, comprising a frame (1), an oil tank (2), a safety valve (4), a cooler (5) and a double-barrel filter (6), wherein the oil tank (2) is arranged on the frame (1), and the oil liquid in the oil tank (2) is controlled by a main pump and an auxiliary pump, and is characterized in that: The fuel tank (2) is provided with a fuel tank partition (203), and the fuel tank (2) is divided into an oil inlet chamber (201), a defoaming area, a cold oil area (202) and a fuel supply area by the fuel tank partition (203). The oil in the fuel supply area of the fuel tank (2) flows out under the control of a pump through a fuel tank outlet (21) provided on the fuel tank (2), and flows into a safety valve (4) and a cooler (5) respectively. When the pressure in the pump outlet pipeline exceeds the safety valve value, a part of the oil in front of the safety valve (4) can flow back into the oil inlet chamber (201) through a safety valve oil return port (41) connected to the fuel tank (2). The cooler (5) is a tubular heat exchanger. After the oil heat exchange is completed, it flows into a double-barrel filter (6) for filtration, and then flows into the equipment that needs to be lubricated with oil. After lubrication, it flows into the oil inlet chamber (201) through a fuel tank oil return port (22) provided on the fuel tank (2). The oil inlet chamber (201) and the defoaming area are connected through a magnetic oil return filter (3), and the magnetic oil return filter (3) can adsorb iron filings in the oil.

2. The oil supply device of a skid-mounted compressor according to claim 1, characterized in that: A cooler temperature control valve (51) is provided beside the cooler (5). When the oil in the fuel tank (2) flows out, part of it flows into the cooler (5), and part of it flows into the cooler temperature control valve (51).

3. The oil supply device of a skid-mounted compressor according to claim 2, characterized in that: Maintenance valves are provided on both sides of the cooler temperature control valve (51).

4. The oil supply device of a skid-mounted compressor according to claim 1, characterized in that: An accumulator (7) is provided on the pipeline connecting the double-barrel filter (6) and the equipment that needs to be lubricated with oil. The accumulator (7) can instantaneously maintain the oil pressure for at least 4 s.

5. The oil supply device of a skid-mounted compressor according to claim 1, characterized in that: A heater (2021) for heating the oil supply is provided in the cold oil area (202). The heater (2021) is a heating rod and is provided with a sleeve on the outside.

6. The oil supply device of a skid-mounted compressor according to claim 1, characterized in that: The magnetic oil return filter (3) is integrally cylindrical, with the upper end communicating with the oil inlet chamber (201) and the lower end communicating with the defoaming area. Annular guide vanes (31) and an adsorption magnetic group (34) for adsorbing iron filings are arranged in the magnetic oil return filter (3) in an axial array from top to bottom.

7. The oil supply device of a skid-mounted compressor according to claim 6, characterized in that: The distance between the annular guide vanes (31) gradually increases from top to bottom, and the oil forms a spiral downward flow in the magnetic oil return filter (3).

8. The oil supply device of a skid-mounted compressor according to claim 7, characterized in that: The adsorption magnetic group (34) is divided into a first magnetic pole group (311), a second magnetic pole group (312) and a third magnetic pole group (313), and the magnetic field intensities are different. In the magnetic oil return filter (3), the first magnetic pole group (311), the second magnetic pole group (312) and the third magnetic pole group (313) are arranged from top to bottom respectively. The magnetic field intensity of the second magnetic pole group (312) is the largest, and the magnetic field intensity of the third magnetic pole group (313) is the smallest. Each group in the adsorption magnetic group (34) is provided with 6 magnetic poles arranged in a circumferential array, and the N and S poles are arranged alternately.

9. The oil supply device of a skid-mounted compressor according to any one of claims 6-8, characterized in that: A magnetic ring (32) is provided at the bottom outlet of the magnetic oil return filter (3). The magnetic ring (32) is close to the inner wall of the magnetic oil return filter (3), and a slope (33) is provided inside the magnetic ring (32). The slope (33) is an upward convex inclined surface.

10. The oil supply device of a skid-mounted compressor according to claim 9, characterized in that: A handle (301) is provided on the magnetic oil return filter (3).

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