Double-layer oil tank hydraulic system capable of preventing oil emulsification in high-humidity environment

Abstract

The invention discloses a double-layer oil tank hydraulic system capable of preventing oil emulsification in a high-humidity environment, and particularly relates to the technical field of groove type solar heat collection fields and offshore wind power hydraulic system hydraulic stations. The double-layer oil tank hydraulic system comprises an outer shell and a built-in oil tank installed in the outer shell, and a connecting flange is connected between the bottom of the built-in oil tank and the inner wall of the bottom of the outer shell; an air buffering cavity is formed between the built-in oil tank and the inner wall of the outer shell, an air inlet channel is arranged at one side end of the outer shell, an air inlet filter screen is installed on the air inlet channel, and an air filter is installed on the outer wall of the outer shell and located on the outer side of the air inlet filter screen. Through structural innovation and intelligent control, oil liquid is isolated from wet air, condensate water is prevented from being generated and invaded, the problems of oil liquid emulsification and element corrosion in the high-humidity environment are solved, the wet air invasion path is blocked through physical isolation and drying agent cyclic utilization, and the manual maintenance frequency is reduced.

Description

Technical Field

[0001] The present invention relates to the technical fields of trough solar thermal collector fields and hydraulic stations of offshore wind power hydraulic systems. More specifically, the present invention relates to a double-layer fuel tank hydraulic system for preventing oil emulsification in a high-humidity environment. Background Art

[0002] In a trough solar thermal collector field hydraulic station built in a grassland climate zone and in an offshore wind power system, the day-night temperature difference (usually reaching 15 - 25 °C) in a high-humidity environment will cause the liquid level in the fuel tank to change, triggering "breathing", resulting in periodic gas exchange between the outside wet air and the inside of the fuel tank. When the night temperature drops below the dew point (typical dew point temperature 20 - 25 °C), water vapor condenses into suspended water droplets of 0.5 - 10 μm on the inner wall of the fuel tank and in the hydraulic oil, thereby causing the following problems: 1. Emulsification of hydraulic oil: When the water content exceeds 0.15%, the emulsification of the oil causes a decrease in lubricating performance; 2. Corrosion of components: The annual corrosion rate of iron-based materials reaches 0.1 - 0.3 mm, shortening the service life of hydraulic components; 3. Deterioration of lubricating performance: The viscosity index decreases by 15 - 25%, exacerbating component wear.

[0003] In the prior art, a single-layer fuel tank relies on desiccants or simple sealing, which cannot solve the periodic moisture absorption problem caused by the day-night temperature difference. Moreover, the desiccant regeneration efficiency is low and there is a lack of a failure emergency design, resulting in a 3 - 5-fold increase in the system failure rate and a 20 - 35% increase in the average annual maintenance cost. In a 100 MW trough solar power plant, there are 1,400 hydraulic systems, and most of the failures are caused by oil emulsification problems, seriously affecting the annual power generation, and the maintenance cost of hydraulic equipment is high. Therefore, there is an urgent need for a hydraulic system with active dehumidification, intelligent control, and redundant protection. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a double-layer fuel tank hydraulic system for preventing oil emulsification in a high-humidity environment.

[0005] To achieve the above object, the present invention provides the following technical solution: A double-layer fuel tank hydraulic system for preventing oil emulsion in a high-humidity environment, including an outer casing and an inner fuel tank installed inside the outer casing. A connecting flange is connected between the bottom of the inner fuel tank and the inner wall of the bottom of the outer casing, and an air buffer chamber is formed between the inner wall of the inner fuel tank and the outer casing. An air inlet channel is provided at one end of the outer casing, and an air inlet filter is installed on the air inlet channel. An air filter is installed on the outer wall of the outer casing outside the air inlet filter, and silica gel desiccant is filled outside the air inlet filter in the air inlet channel. An electric heating wire is spirally installed in the filling area of the silica gel desiccant. A side partition for isolating the air inlet channel from the air buffer chamber is provided inside the outer casing. A number of side plate through holes and a plurality of staggered moisture inlet through holes are provided inside the side partition. Among them, a diversion hood connected to each moisture inlet through hole is installed inside the air buffer chamber, and an exhaust fan is installed at the end of each diversion hood. A normally open air inlet valve is provided at the top of the inner fuel tank, and the normally open air inlet valve is communicated with the side plate through holes. A fixed cylinder is fixedly communicated with the outer wall of the top of the outer casing on one side of the air filter. A snap ring is provided on the inner wall of the end of the fixed cylinder, and a rubber sleeve clamped inside the snap ring is connected to the end of the fixed cylinder. A temperature and humidity sensor is installed on the top of the outer casing, and a diversion plate is connected to the inner wall of the bottom of the outer casing.

[0006] As a further improvement of the technical solution of the present invention, hydrophilic coatings with a thickness of not less than 0.3 mm are sprayed on the inner wall of the outer casing and the outer wall of the inner fuel tank, and the hydrophilic coating is a polyethylene glycol modified coating.

[0007] As a further improvement of the technical solution of the present invention, the diversion plate is fixedly welded to the inner wall of the outer casing, and the inclination angle of the inclined surface of the diversion plate is 15°. The provided diversion plate forms a diversion groove, and a drain valve is provided at the bottom.

[0008] As a further improvement of the technical solution of the present invention, the rubber sleeve includes a rubber ring clamped inside the fixed cylinder. Inner convex rings and outer convex rings are respectively provided at both ends of the rubber ring on the inner and outer sides of the fixed cylinder, and a number of micropores are provided inside the rubber ring.

[0009] As a further improvement of the technical solution of the present invention, the temperature and humidity sensor is used to monitor the humidity inside the outer fuel tank in real time. When the detected humidity exceeds the preset threshold and the device is in the night shutdown state, the following actions are triggered: a. Send an alarm signal immediately to prompt the operator that the desiccant has reached the moisture absorption saturation; b. Start the electric heating wire to heat the silica gel desiccant (the temperature is controlled at 100-120 °C) to evaporate the adsorbed moisture and make it regenerate.

[0010] As a further improvement of the technical solution of the present invention, an oil circuit unit is provided on the built-in fuel tank. The oil circuit unit includes an oil suction pipe, a return pipe, and a hydraulic pump. A fuel injection and sewage discharge valve is provided at the bottom of the built-in fuel tank. One end of the oil suction pipe is connected to the bottom end of the built-in fuel tank, and the other end of the oil suction pipe is connected to a hydraulic pump. A return pipe for returning oil is connected to the top of the built-in fuel tank. The fuel injection and sewage discharge valve is used for initial fuel injection and regular sewage discharge.

[0011] As a further improvement of the technical solution of the present invention, the single-chip microcomputer is connected to a remote monitoring platform through a wireless signal, and an audible and visual alarm is provided on the remote monitoring platform.

[0012] As a further improvement of the technical solution of the present invention, a medium is injected into the built-in fuel tank, and the medium is hydraulic oil.

[0013] As a further improvement of the technical solution of the present invention, a single-chip microcomputer is installed on the outer wall of the top of the outer casing, and a bottom partition for optimizing the air flow path with the side partition is provided at the bottom of the outer casing.

[0014] The control logic of the temperature and humidity sensor is as follows: when the humidity in the air buffer chamber is detected to be ≥ the preset threshold (60%RH) and the device is shut down, a signal is transmitted to the single-chip microcomputer, and the single-chip microcomputer sends an alarm signal to the remote monitoring platform immediately. Subsequently, the electric heating wire is triggered to heat the silica gel desiccant at 100-120°C for half an hour.

[0015] The beneficial effects of the present invention: A double-layer fuel tank hydraulic system for preventing oil emulsification in a high-humidity environment designed by the present invention, through structural innovation and intelligent control, isolates the oil from contact with humid air, prevents the generation and intrusion of condensed water, solves the problems of oil emulsification and component corrosion in a high-humidity environment, blocks the intrusion path of humid air through physical isolation and the recycling of desiccants, reduces the frequency of manual maintenance, and only starts the electric heating wire when the device is shut down at night, avoiding heating interference with the system temperature during operation, realizing energy conservation and efficient regeneration. The desiccant regeneration is the main protection, and the hydrophilic coating for guiding water drainage is a redundant design, covering the waterproof requirements of the entire scenario, reducing the moisture content of the hydraulic oil, avoiding emulsification, reducing the annual corrosion rate of hydraulic components, extending the service life, controlling the fluctuation of the oil viscosity index within 5%, maintaining stable lubrication performance, reducing the system failure rate, and reducing the average annual maintenance cost. Brief Description of the Drawings

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is an enlarged view of part A in Fig. 1 of the present invention.

[0018] Figure 3This is a schematic structural diagram of the rubber ferrule in the present invention.

[0019] The reference numerals are: 1, air filter; 2, intake filter screen; 3, silica gel desiccant; 4, electric heating wire; 5, bottom partition board; 6, side partition board; 7, drain valve; 8, temperature and humidity sensor; 9, normally open intake valve; 10, return oil pipe; 11, suction oil pipe; 12, connecting flange; 13, oil injection and sewage discharge valve; 14, medium; 15, built-in fuel tank; 16, outer shell; 17, side plate through hole; 18, flow guiding plate; 19, wet intake through hole; 20, flow guiding cover; 21, exhaust fan; 22, fixed cylinder; 23, snap ring; 24, rubber ferrule; 25, single-chip microcomputer; 241, rubber ring; 242, built-in convex ring; 243, external convex ring. Specific embodiments

[0020] 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] As shown in the appendix Figures 1-3A double-layer fuel tank hydraulic system for preventing oil emulsion in a high-humidity environment, as shown, includes an outer casing 16 and an internal fuel tank 15 installed inside the outer casing 16. A medium 14 is arranged inside the internal fuel tank 15. A connecting flange 12 is connected between the bottom of the internal fuel tank 15 and the inner wall of the bottom of the outer casing 16, and an air buffer chamber is formed between the inner wall of the internal fuel tank 15 and the outer casing 16. An air inlet channel is arranged at one end of the outer casing 16, and an air inlet filter 2 is installed on the air inlet channel. An air filter 1 is installed on the outer wall of the outer casing 16 outside the air inlet filter 2, and silica gel desiccant 3 is filled outside the air inlet filter 2 in the air inlet channel. An electric heating wire 4 is spirally installed in the filling area of the silica gel desiccant 3. A side partition 6 for isolating the air inlet channel from the air buffer chamber is arranged inside the outer casing 16. A number of side plate through holes 17 and a plurality of staggered moisture inlet through holes 19 are arranged inside the side partition 6. Among them, a flow guide cover 20 connected to each moisture inlet through hole 19 is installed inside the air buffer chamber, and an exhaust fan 21 is installed at the end of each flow guide cover 20. A normally open air inlet valve 9 is arranged at the top of the internal fuel tank 15, and the normally open air inlet valve 9 is communicated with the side plate through holes 17. A fixed cylinder 22 is fixedly communicated with the outer wall of the top of the outer casing 16 on one side of the air filter 1. A snap ring 23 is arranged on the inner wall of the end of the fixed cylinder 22, and a rubber sleeve 24 stuck inside the snap ring 23 is connected to the end of the fixed cylinder 22. A temperature and humidity sensor 8 is installed on the top of the outer casing 16, and a flow guide plate 18 is connected to the inner wall of the bottom of the outer casing 16. A single-chip microcomputer 25 is installed on the outer wall of the top of the outer casing 16. A bottom partition 5 for optimizing the air flow path with the side partition 6 is arranged at the bottom of the outer casing 16.

[0022] As shown in the appendix Figure 1 As shown, hydrophilic coatings with a thickness of not less than 0.3 mm are sprayed on the inner wall of the outer casing 16 and the outer wall of the internal fuel tank 15. The hydrophilic coating is a polyethylene glycol modified coating. The flow guide plate 18 is fixedly welded to the inner wall of the outer casing 16, and the inclined surface angle of the flow guide plate 18 is 15°. The arranged flow guide plate 18 forms a flow guide groove, and a drain valve 7 is arranged at the bottom. If the desiccant regeneration fails subsequently, the condensed water gathers along the flow guide groove to the drain valve 7 through the hydrophilic coating. When the temperature and humidity sensor 8 detects that the humidity continues to be high and the electric heating wire regeneration is ineffective, the drain valve 7 is automatically opened to discharge the condensed water.

[0023] As shown in the appendix Figures 1-3 As shown, the rubber sleeve 24 includes a rubber ring 241 stuck inside the fixed cylinder 22. Inner convex rings 242 and outer convex rings 243 are respectively arranged at both ends of the rubber ring 241 on the inner and outer sides of the fixed cylinder 22. A number of micropores are arranged inside the rubber ring 241. The arranged rubber sleeve 24 is convenient for use. When the desiccant is regenerated and a high-temperature and high-pressure state is formed, the rubber ring 241 on the rubber sleeve 24 expands outward under the action of heat and air pressure, gradually expanding the micropores. At this time, the high-temperature, high-pressure and moisture are discharged.

[0024] As shown in the appendix Figure 1 The humidity and temperature sensor 8 is used to monitor the humidity inside the external fuel tank in real time. When the detected humidity exceeds the preset threshold and the device is in the night shutdown state, the following actions are triggered: a. Send an alarm signal immediately to prompt the operator that the desiccant has reached saturation in moisture absorption; b. Start the electric heating wire to heat the silica gel desiccant, control the temperature at 100 - 120 °C, and evaporate the adsorbed moisture to regenerate it.

[0025] As shown in the appendix Figure 1 As shown, an oil circuit unit is provided on the built-in fuel tank 15. The oil circuit unit includes an oil suction pipe 11, a return oil pipe 10, and a hydraulic pump. An oil injection and sewage discharge valve 13 is provided at the bottom of the built-in fuel tank 15. One end of the oil suction pipe 11 is connected to the bottom end of the built-in fuel tank 15, and the other end of the oil suction pipe 11 is connected to a hydraulic pump. The top of the built-in fuel tank 15 is connected to a return oil pipe 10 for returning oil. The oil injection and sewage discharge valve 13 is used for initial oil injection and regular sewage discharge.

[0026] As shown in the appendix Figure 1 As shown, the single-chip microcomputer 25 is connected to the remote monitoring platform through a wireless signal, and an audible and visual alarm is provided on the remote monitoring platform.

[0027] Among them, for the humidity and temperature sensor 8, the single-chip microcomputer 25 and other electrical structures in the present invention, common model types on the market can be selected, and the specific models and appearance structures are not specifically limited.

[0028] Among them, the control logic of the humidity and temperature sensor 8 is: when the humidity in the air buffer chamber is detected to be ≥ the preset threshold (60%RH) and the device is shut down, the signal is transmitted to the single-chip microcomputer 25, and the single-chip microcomputer 25 immediately sends an alarm signal to the remote monitoring platform, and then triggers the electric heating wire 4 to heat the silica gel desiccant 3 at 100 - 120 °C for half an hour.

[0029] Working principle: The present invention designs a double-layer fuel tank hydraulic system for preventing oil emulsion in a high-humidity environment. The built-in fuel tank 15 is fixed at the center of the external fuel tank 16 through a connecting flange 12, and a 50-mm gap is formed between the two to form an air buffer chamber. The inner wall of the outer casing 16 and the outer wall of the built-in fuel tank 15 are sprayed with a hydrophilic coating with a thickness of not less than 0.3 mm. The inner wall is welded with a flow guide plate 18 to form a flow guide groove inclined at 15°. The bottom is connected to a drain valve 7. The air inlet channel is sequentially installed with an air filter 1, an air inlet filter screen 2, and a silica gel desiccant 3. The end is connected to the through hole 17 on the top side plate of the outer casing 16 through a normally open air inlet valve 9. The bottom of the built-in fuel tank 15 is provided with an oil suction pipe 11 connected to a hydraulic pump, and the top is provided with a return oil pipe 10 to receive the system return oil. The bottom oil injection and sewage discharge valve 13 is used for initial oil injection and regular sewage discharge. The humidity and temperature sensor 8 is installed on the inner wall of the external fuel tank. The electric heating wire 4 is wound under the silica gel desiccant 3, and both are electrically connected to the control system; During use, external air is filtered by impurities through the air filter 1 and the intake screen 2, and then the moisture is removed by the silica gel desiccant 3. The dry air enters the outer housing 16 through the normally open intake valve 9 to balance the air pressure generated by the liquid level change of the built-in fuel tank 15, preventing the wet air from directly contacting the hydraulic oil. When the equipment stops operating at night, if the temperature and humidity sensor 8 detects that the humidity exceeds the standard, the electric heating wire 4 starts to heat the silica gel desiccant 3, and the regenerated desiccant restores its moisture absorption capacity. When the desiccant is regenerated and in a high-temperature and high-pressure state, the rubber ring 241 on the rubber ferrule 24 expands outward under the action of heat and air pressure, gradually expanding the micropores. At this time, the high-temperature, high-pressure and moisture are discharged. When the desiccant fails or the heating fails, the hydrophilic coating guides the condensed water to flow along the diversion groove to the drain valve 7, and the system automatically drains water according to the continuously exceeding humidity signal to prevent the condensed water from seeping into the built-in fuel tank 15. Moreover, when the temperature and humidity sensor 8 detects that the temperature and humidity in the air buffer chamber are relatively high, the exhaust fan 21 can be turned on to return the gas to the filling area of the silica gel desiccant 3; Among them, the temperature and humidity sensor 8 collects the humidity data inside the outer housing 16 every 10 minutes. The preset alarm threshold is 60%RH corresponding to the dew point temperature of 22°C. When the humidity ≥ 60%RH and the equipment is in a stopped state, it is judged by detecting the current of the hydraulic pump. The single-chip microcomputer 25 sends a fault code to the remote monitoring platform and gives an audible and visual alarm; the electric heating wire 4 is started within 5 minutes after the alarm, with a heating power of 500W, and continuously heated for 30 minutes to raise the temperature of the silica gel desiccant 3 to 110°C and maintain it for 15 minutes. After the heating ends, it stops automatically, and the desiccant regeneration is completed; If the humidity is still ≥ 60%RH after 3 consecutive regenerations, the control system determines that the desiccant has failed, automatically opens the drain valve 7 for ten minutes to drain the condensed water in the diversion groove, and at the same time triggers a prompt for manual replacement of the desiccant.

[0030] Among them, in the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments of the present disclosure are involved. Other structures can refer to the usual designs. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-layer fuel tank hydraulic system for preventing oil emulsion in a high-humidity environment, characterized in that: It includes an outer housing (16) and a built-in fuel tank (15) installed inside the outer housing (16). A connecting flange (12) is connected between the bottom of the built-in fuel tank (15) and the inner wall of the bottom of the outer housing (16), and an air buffer chamber is formed between the inner wall of the built-in fuel tank (15) and the inner wall of the outer housing (16). An air inlet channel is provided at one end of the outer housing (16), and an air inlet filter (2) is installed on the air inlet channel. An air filter (1) is installed on the outer wall of the outer housing (16) outside the air inlet filter (2), and silica gel desiccant (3) is filled outside the air inlet filter (2) in the air inlet channel. An electric heating wire (4) is spirally installed in the filling area of the silica gel desiccant (3). A side partition plate (6) for isolating the air inlet channel from the air buffer chamber is provided inside the outer housing (16). A number of side plate through holes (17) and a plurality of staggered moisture inlet through holes (19) are provided inside the side partition plate (6). Among them, a flow guide cover (20) connected to each moisture inlet through hole (19) is installed inside the air buffer chamber, and an exhaust fan (21) is installed at the end of each flow guide cover (20). A normally open air inlet valve (9) is provided at the top of the built-in fuel tank (15), and the normally open air inlet valve (9) is communicated with the side plate through hole (17). A fixed cylinder (22) is fixedly communicated with the outer wall of the top of the outer housing (16) on one side of the air filter (1). A snap ring (23) is provided on the inner wall of the end of the fixed cylinder (22), and a rubber snap sleeve (24) stuck inside the snap ring (23) is connected to the end of the fixed cylinder (22). A temperature and humidity sensor (8) is installed on the top of the outer housing (16), and a flow guide plate (18) is connected to the inner wall of the bottom of the outer housing (16).

2. A double-layer fuel tank hydraulic system for preventing oil emulsion in a high-humidity environment according to claim 1, characterized in that: The inner wall of the outer housing (16) and the outer wall of the built-in fuel tank (15) are both sprayed with a hydrophilic coating with a thickness of not less than 0.3 mm, and the hydrophilic coating is a polyethylene glycol modified coating.

3. A double-layer fuel tank hydraulic system for preventing oil emulsion in a high-humidity environment according to claim 1, characterized in that: The flow guide plate (18) is fixedly welded to the inner wall of the outer housing (16), and the inclination angle of the inclined surface of the flow guide plate (18) is 15°. The provided flow guide plate (18) forms a flow guide groove, and a drain valve (7) is provided at the bottom.

4. A double-layer fuel tank hydraulic system for preventing oil emulsion in a high-humidity environment according to claim 1, characterized in that: The rubber snap sleeve (24) includes a rubber ring (241) stuck inside the fixed cylinder (22). Built-in convex rings (242) and external convex rings (243) are respectively provided on the inner and outer sides of the two ends of the rubber ring (241) with respect to the fixed cylinder (22), and a number of micropores are provided inside the rubber ring (241).

5. A double-layer fuel tank hydraulic system for preventing oil emulsion in a high-humidity environment according to claim 1, characterized in that: The temperature and humidity sensor (8) is used to monitor the humidity inside the external fuel tank in real time. When it detects that the humidity exceeds the preset threshold and the device is in the night shutdown state, the following actions are triggered: a. Send an alarm signal immediately to prompt the operator that the desiccant has reached saturation in moisture absorption; b. Start the electric heating wire to heat the silica gel desiccant (the temperature is controlled at 100 - 120 °C) to evaporate the adsorbed moisture and regenerate it.

6. A double-layer fuel tank hydraulic system for preventing oil emulsion in a high-humidity environment according to claim 1, characterized in that: An oil circuit unit is provided on the built-in fuel tank (15). The oil circuit unit includes a suction pipe (11), a return pipe (10), and a hydraulic pump. A fuel injection and sewage discharge valve (13) is provided at the bottom of the built-in fuel tank (15). One end of the suction pipe (11) is connected to the bottom end of the built-in fuel tank (15), and the other end of the suction pipe (11) is connected to a hydraulic pump. A return pipe (10) for returning oil is connected to the top of the built-in fuel tank (15). The fuel injection and sewage discharge valve (13) is used for initial fuel injection and regular sewage discharge.

7. A double-layer fuel tank hydraulic system for preventing oil emulsion in a high-humidity environment according to claim 1, characterized in that: The single-chip microcomputer (25) is connected to a remote monitoring platform through a wireless signal, and an audible and visual alarm is provided on the remote monitoring platform.

8. A double-layer fuel tank hydraulic system for preventing oil emulsion in a high-humidity environment according to claim 1, characterized in that: A medium (14) is injected into the interior of the built-in fuel tank (15), and the medium is hydraulic oil.

9. A double-layer fuel tank hydraulic system for preventing oil emulsion in a high-humidity environment according to claim 1, characterized in that: A single-chip microcomputer (25) is installed on the outer wall of the top of the outer housing (16), and a bottom partition (5) for optimizing the air flow path with the side partition (6) is provided at the bottom of the outer housing (16).

10. A double-layer fuel tank hydraulic system for preventing oil emulsification in a high-humidity environment according to claim 1, characterized in that: The control logic of the temperature and humidity sensor (8) is as follows: when it detects that the humidity in the air buffer chamber is ≥ the preset threshold (60%RH) and the device is shut down, it transmits a signal to the single-chip microcomputer (25), and the single-chip microcomputer (25) sends an alarm signal to the remote monitoring platform in the first time, and then triggers the electric heating wire (4) to heat the silica gel desiccant (3) at 100 - 120 °C for half an hour.

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