CN111059086B - Adaptive closed hydraulic tank - Google Patents

Abstract

The invention discloses a self-adaptive closed hydraulic oil tank, which comprises an oil tank body, a liquid-gas isolation mechanism arranged on the oil tank body, a degassing and dehydrating mechanism arranged at the top of the oil tank body and a filtering and cooling circulation mechanism arranged on the oil tank body, wherein the filtering and cooling circulation mechanism is arranged on the oil tank body; the degassing and dewatering mechanism comprises a damping channel communicated with the inside of the oil tank body, an air inlet one-way valve connected with the damping channel, an oil-water separator connected with the air inlet one-way valve, a vacuum generator connected with the oil-water separator and a high-speed travel reversing valve; the high-speed travel reversing valve is communicated with the filtering and cooling circulating mechanism, and the vacuum generator is connected with the exhaust one-way valve for exhausting gas.

Description

Adaptive closed hydraulic tank

Technical field

The invention relates to the field of oil tanks, and in particular to an adaptive closed hydraulic oil tank.

Background technique

The actual operation experience of hydraulic systems shows that pollution is the main cause of failure of hydraulic systems. Hydraulic system pollutants originate from residues in the manufacturing process of hydraulic components, external infiltrations, and products generated during system operation. They mainly include solid particles, water, air, chemical pollutants, microorganisms, and polluted energy. These pollutants not only accelerate the wear of components, block the gaps and damping channels in components, but also accelerate the oxidation and deterioration of the hydraulic medium, corrode the metal surface, and excessive heat energy reduces the viscosity of the hydraulic medium, increasing the amount of leakage, and contamination mixed in the hydraulic working medium. Materials seriously affect the reliability of the hydraulic system and the service life of the components.

Existing hydraulic oil tanks mostly adopt an open structure, and the liquid level in the oil tank is connected to the atmosphere through an air filter. This kind of oil tank is very disadvantageous for hydraulic pumps with poor self-priming ability, especially hydraulic pumps operating at high altitudes, and often This causes the hydraulic pump inlet pressure to decrease and cause cavitation of the hydraulic pump, seriously affecting the normal operation of the hydraulic system. In addition, most existing hydraulic oil tanks consider the heat dissipation of the tank itself. In order to extend the flow channel, reduce the flow rate, and fully separate the air and precipitated solid particles in the hydraulic medium, the tank volume is generally designed according to 5 to 7 times the system flow rate, so For occasions where the space volume is limited, especially for mobile machinery, it is unsatisfactory. The existing hydraulic oil tank requires the main pump device to be operated online to achieve filtration and purification of the hydraulic medium. It is unable to achieve energy-saving offline cycle cleaning, and it is impossible to realize the online and offline degassing and dehydration functions of the hydraulic medium.

For this reason, an adaptive closed hydraulic oil tank is needed to overcome the above defects and meet the needs of use.

Contents of the invention

In view of this, this patent invented an adaptive closed hydraulic oil tank, which is used in various hydraulic systems, especially suitable for hydraulic media with high gas content, water content, cleanliness, temperature range, relative pressure requirements and the tank body. A hydraulic system with small volume, high integration, and can operate online/offline.

An adaptive closed hydraulic oil tank, including an oil tank body, a liquid-gas isolation mechanism provided on the oil tank body, a degassing and dehydration mechanism provided on the top of the oil tank body, and a filtering and cooling circulation mechanism provided on the oil tank body; the degassing The dehydration mechanism includes a damping channel connected to the inside of the fuel tank body, an air inlet check valve connected to the damping channel, an oil-water separator connected to the air inlet check valve, a vacuum generator connected to the oil-water separator, and a vacuum generator connected to the oil-water separator. The generator is connected to a high-speed stroke reversing valve; the high-speed stroke reversing valve is connected to the filtration cooling cycle mechanism, and the vacuum generator is connected to an exhaust check valve for discharging gas.

Further, the filtration and cooling cycle mechanism includes an oil suction filter connected to the oil tank body, a cooling circulation pump device connected to the oil suction filter, an oil pressure filter connected to the cooling circulation pump device, and an oil pressure filter connected to the oil pressure filter. A plate heat exchanger; the plate heat exchanger is connected to a high-speed stroke reversing valve.

Further, the liquid-gas isolation mechanism includes a bladder-type accumulator connected to the oil tank body and a stop valve provided between the fuel tank body and the bladder-type accumulator.

Furthermore, the high-speed stroke reversing valve is also connected to the inside of the fuel tank body.

Further, the degassing and dehydration mechanism further includes a pressure gauge switch connected to the damping channel and a vacuum gauge connected to the pressure gauge switch.

Furthermore, a magnetic flap liquid level gauge for detecting liquid level is provided on the side of the oil tank body.

Furthermore, a corrugated structure for lengthening the length of the flow channel is provided inside the fuel tank body.

Furthermore, the bottom of the tank body forms an angle of 5-10° with respect to the horizontal direction, and a drain stop valve for discharging impurities is provided at the lowest point of the tank body.

The beneficial effects of the present invention are:

The adaptive closed hydraulic tank of this technical solution can not only perform cyclic degassing and dehydration, but also perform cyclic filtration, cooling and continuous heating. It can finally reach a water content of ≤10ppm and a gas content of ≤1%, and maintain the temperature range of the hydraulic medium. 20℃～50℃, cleanliness ≤3μm, strong adaptability; good sealing, not only effectively prevents the hydraulic medium of the tank body from contacting the atmosphere, but also keeps the relative pressure of the hydraulic medium between 0.05MPa～0.14MPa, which is very good It solves the problem of insufficient self-priming capacity of the hydraulic pump; it has a small volume and does not consider the heat dissipation of the fuel tank itself. The volume of the fuel tank is usually 1/10 of the traditional fuel tank. It is widely used in occasions with limited space and volume. It is especially suitable for mobile machinery hydraulic equipment. Medium; The various components that make up the fuel tank body can be flexibly arranged according to actual needs, with a high degree of integration, which can not only achieve energy-saving offline cycle cleaning, but also achieve online filtration and purification.

Description of the drawings

The present invention will be further described below in conjunction with the accompanying drawings and examples:

Figure 1 is a schematic structural diagram of the present invention;

Figure 2 is a schematic structural diagram of the hydraulic system of the present invention;

Figure 3 is a schematic diagram of the internal layout of the box of the present invention;

Figure 4 is a schematic diagram of the vacuum generator of the present invention when it is running downward;

Figure 5 is a schematic diagram of the vacuum generator of the present invention when it is running upward.

Detailed ways

Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the hydraulic system of the present invention; Figure 3 is a schematic structural diagram of the internal arrangement of the box of the present invention; Figure 4 is a schematic diagram of the vacuum generator of the present invention when it is running downward; Figure 5 is a schematic diagram of the vacuum generator of the present invention when it is running downwards; A schematic diagram of the invented vacuum generator when it is running upward; as shown in the figure; an adaptive closed hydraulic oil tank, including an oil tank body 1, a liquid-gas isolation mechanism 4 provided on the oil tank body 1, and a detachment mechanism provided on the top of the oil tank body 1 The gas dehydration mechanism 7 and the filter cooling circulation mechanism 8 provided on the oil tank body 1; the degassing and dehydration mechanism includes a damping channel 71 connected with the inside of the oil tank body 1, an air inlet check valve 72 connected to the damping channel 71, An oil-water separator 73 is connected to the air intake check valve 72, a vacuum generator 75 is connected to the oil-water separator 73, and a high-speed stroke reversing valve 78 is connected to the vacuum generator 75; the high-speed stroke reversing valve 78 is connected to the filter cooling cycle mechanism 8, and the vacuum generator 75 is connected with an exhaust check valve 77 for discharging gas; the adaptive closed hydraulic oil tank of this technical solution can not only perform cyclic degassing and dehydration, but also Moreover, it can perform cyclic filtration, cooling and continuous heating, and finally can reach a water content of ≤10ppm and a gas content of ≤1%. The temperature range of the hydraulic medium can be maintained at 20℃~50℃, and the cleanliness should be ≤3μm. It has strong adaptability and good sealing performance. It not only effectively prevents the hydraulic medium in the tank body 1 from contacting the atmosphere, but also keeps the relative pressure of the hydraulic medium between 0.05MPa and 0.14MPa, which effectively solves the problem of insufficient self-priming capacity of the hydraulic pump; the volume is small and the tank is not considered Due to its own heat dissipation, the volume of the fuel tank is usually 1/10 of the traditional fuel tank. It is widely used in situations where the space volume is limited, and is especially suitable for mobile machinery and hydraulic equipment; the various components that constitute the fuel tank body 1 can be flexibly arranged and integrated according to actual needs. High efficiency, it can not only realize energy-saving offline cycle cleaning, but also realize online filtration and purification.

The degassing and dehydration mechanism 7 is installed on the top plate of the fuel tank body 1. The vacuum generator 75 is a reciprocating vacuum pump. Its downward movement is in the suction process, that is, the process of generating vacuum. The free air existing in the upper part of the fuel tank body 1 and The air and moisture dissolved in the hydraulic medium are separated through the damping channel 71 and the air intake check valve 72. The greater the degree of vacuum, the greater the content of separated water vapor. When the reciprocating vacuum pump moves to the maximum displacement, the degassing and dehydration mechanism 7 generates the maximum degree of vacuum. At this time, the output end block triggers the control rod of the high-speed stroke reversing valve 78, and the high-speed stroke reversing valve 78 reverses direction, so that the hydraulic medium output from the filter cooling cycle mechanism 8 enters the degassing and dehydration mechanism 7, and the hydraulic medium A large amount of air and moisture are separated. The upward movement of the reciprocating vacuum pump is in the exhaust process, and all the air and moisture separated from the hydraulic medium are exhausted to the atmosphere through the exhaust check valve 77. Such reciprocating motion achieves circular degassing and dehydration of the hydraulic medium; the oil-water separator 73 is built into the vacuum generator 75 to automatically separate the hydraulic oil entering the vacuum generator 75 and discharge the separated moisture along with the gas. Outside the fuel tank body 1.

As shown in Figure 4, O represents oil and A represents gas. When the compound vacuum pump runs downward (the big black arrow in the picture), the free air in the upper part of the tank body 1 and the air and moisture dissolved in the hydraulic medium (i.e. the small black arrow in the picture) Black arrow) is separated from the intake check valve 72 through the damping channel 71. At this time, the high-speed stroke reversing valve 78 does not change direction, and the oil in the tank body 1 (dashed arrow in the figure) first passes through the filter cooling circulation mechanism 8 Then through the high-speed stroke reversing valve 78, the flow will go to the inside of the fuel tank; as shown in Figure 5, O represents oil and A represents gas. When the compound vacuum pump runs downward to the maximum position and starts the reset movement, the high-speed stroke reversal is at this time The valve 78 reverses direction, and the oil in the tank body 1 (dashed arrow in the figure) enters the cavity at the lower end of the reciprocating vacuum pump through the high-speed stroke reversing valve 78 (due to the suction effect of the reciprocating vacuum pump, the upper end of the cavity is under negative pressure state) further degassing and dehydrating the oil, and the oil finally flows out from the opening at the lower end of the cavity.

In this embodiment, the filtration and cooling circulation mechanism 8 includes an oil suction filter 81 connected with the oil tank body 1 , a cooling circulation pump device 82 connected with the oil suction filter 81 , and a pressure oil filter connected with the cooling circulation pump device 82 83 and a plate heat exchanger 84 connected to the pressure oil filter 83; the plate heat exchanger 84 is connected to the high-speed stroke reversing valve 78. The filter cooling circulation mechanism 8 is installed on the right side panel of the fuel tank body 1 . The hydraulic medium outlet of the plate heat exchanger 84 is connected to the inlet of the high-speed stroke reversing valve 78, so that the filtered and cooled hydraulic medium is transported to the degassing and dehydration device 7, realizing the circulating filtering and cooling of the hydraulic medium in the closed device. Degassing and dehydration operations. Plate heat exchanger 84 has a large heat dissipation area, high heat dissipation coefficient, and good heat dissipation effect. It can quickly reduce the temperature of the hydraulic medium to within 50°C, prolong the service life of the oil, and improve the oil quality. By selecting different filtration precision types, the filtration precision of hydraulic media can be reduced to within 3 μm to adapt to the requirements of different hydraulic systems for hydraulic media.

In this embodiment, the liquid-gas isolation mechanism 4 includes a bladder-type accumulator 42 connected to the fuel tank body 1 and a stop valve 41 disposed between the fuel tank body 1 and the bladder-type accumulator 42; The isolation mechanism 4 is installed on the top plate of the fuel tank body 1 and mainly includes a stop valve 41 and a bladder-type accumulator 42; the stop valve 41 is installed between the top plate of the fuel tank body 1 and the bladder-type accumulator 42 for control. The hydraulic medium between the two is switched on and off; according to the needs of the hydraulic system, the nitrogen pressure value in the bladder accumulator 42 can reach between 0.05MPa and 0.14MPa. The liquid-gas isolation mechanism 4 not only effectively prevents the gas in the tank body 1 from The hydraulic medium is in contact with the atmosphere, and the relative pressure in the tank body 1 is kept greater than 0MPa, so that the hydraulic pump has higher efficiency and can run at higher speeds without the risk of cavitation, thus making the pump work quieter and very It effectively solves the problem of insufficient self-priming capacity of the hydraulic pump.

In this embodiment, the high-speed stroke reversing valve 78 is connected with the inside of the fuel tank body 1 . When the filtration and cooling circulation mechanism 8 is not working, the degassing and dewatering work inside the tank can also be realized through the internal communication between the tank body 1 and the degassing and dehydration mechanism 7 , that is, the hydraulic medium inside the tank body 1 passes through the damping channel in sequence. 71. The air intake check valve 72, the oil-water separator 73, the vacuum generator 75, the high-speed stroke reversing valve 78 and flow back into the fuel tank body 1, the gas is discharged from the exhaust check valve 77, the degassing and dehydration mechanism 7 and The filter cooling circulation mechanism 8 can be used in conjunction with each other or can be used alone.

In this embodiment, the degassing and dehydration mechanism 7 further includes a pressure gauge switch 74 connected to the damping channel 71 and a vacuum gauge 76 connected to the pressure gauge switch 74 . The pressure gauge switch 74 controls the communication state between the vacuum gauge 76 and the degassing and dehydration mechanism 7 . By observing the indication of the vacuum gauge 76 , the working status of the degassing and dehydration mechanism 7 can be well understood. The amount of degassing and dehydration per unit time is mainly related to the degree of vacuum, the viscosity of the hydraulic medium, the gas content in the medium, the temperature of the medium and the relative water vapor saturation. The hydraulic medium in the tank body 1 is cyclically degassed and dehydrated. Sampling and testing, and cyclic degassing and dehydration, can finally reach a water content of ≤10ppm and a gas content of ≤1% to meet usage requirements.

In this embodiment, a magnetic flap level gauge 3 for detecting liquid level is provided on the side of the oil tank body 1 . The liquid level gauge is installed on the left side of the fuel tank body 1 to measure three different liquid levels, namely the highest liquid level, the low liquid level and the lowest liquid level. The liquid level gauge is set to automatically alarm and provide visual According to online data, when it detects the lowest liquid level, it can control the main pump motor to cut off power and stop running. A heating device 5 and a temperature detection device 6 are also installed on the tank body. The heating device 5 is an electric heating element for oil. This element is installed in the oil suction area of the oil tank body 1 and can continuously heat the hydraulic medium in the oil tank body 1 and keep the temperature of the hydraulic medium not lower than 20°C. The temperature detection device 6 is a temperature sensor. This sensor is installed in the oil suction area of the oil tank body 1. It can set an automatic alarm and provide visual online data. When it detects that the temperature of the hydraulic medium is less than 20°C, it starts the heating device 5 to work or When the temperature is greater than 50°C, the plate heat exchanger 84 is started to work. When the temperature is between 20°C and 50°C, the heating device 5 and the plate heat exchanger 84 are controlled to stop working. It can be understood that for the detector of this technical solution , the specific installation and connection method of the sensor can adopt the connection and installation method in the existing technology, and will not be described in detail here.

In this embodiment, the fuel tank body 1 is provided with a corrugated structure for lengthening the length of the flow passage; the internal flow passage of the fuel tank body 1 adopts a corrugated structure. The interior of the fuel tank body 1 includes an inlet oil pipe 12, an outlet oil pipe 14, two There are a first guide plate 13 and a second guide plate 11, and a row of small holes with a diameter of about 1mm is provided on the two first guide plates 13 near the bottom of the box (perpendicular to the projection plane in Figure 3, not shown ) to deal with the solid impurities sinking to the bottom, and the height of the second guide plate 11 is greater than the height of the two first guide plates 13. This structure has a long flow channel, low flow rate, and can fully separate the hydraulic medium. Characteristics of moisture, air and precipitated pollution particles.

In this embodiment, the bottom of the fuel tank body 1 forms an angle of 5-10° with respect to the horizontal direction (i.e., the horizontal direction in Figure 1). Preferably, the tilt angle is designed to be 8°. A drain stop valve 2 for discharging impurities is provided at the lowest point. A stop valve 2 is installed on the bottom plate of the fuel tank body 1 close to the wall to completely remove waste liquid and waste residue in the fuel tank.

In this embodiment, the installation positions of the above-mentioned liquid level detection mechanism, liquid-gas isolation mechanism 4, degassing and dehydration mechanism 7, and filter cooling cycle mechanism 8 can be adjusted in time as needed. The hydraulic medium is mineral oil-type hydraulic oil and flame retardant. Liquid and other media can be used, and the scope of application is wide. Each component can be flexibly arranged according to actual needs. The integration level is high. There is no secondary pollution of the hydraulic medium. The device is simple and applicable. It can realize energy-saving cyclic cleaning offline and online. Filtration and purification under normal conditions can be used in a wide range of working conditions.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified. Modifications or equivalent substitutions without departing from the spirit and scope of the technical solution of the present invention shall be included in the scope of the claims of the present invention.

Claims (8)

1. An adaptive closed hydraulic oil tank, which is characterized by: comprising a oil tank body, a liquid-gas isolation mechanism provided on the oil tank body, a degassing and dehydration mechanism provided on the top of the oil tank body, and a filter cooling cycle provided on the oil tank body. Mechanism; the degassing and dehydration mechanism includes a damping channel connected to the inside of the fuel tank body, an air inlet check valve connected to the damping channel, an oil-water separator connected to the air inlet check valve, and an oil-water separator connected to the oil-water separator. A vacuum generator and a high-speed stroke reversing valve connected to the vacuum generator; the high-speed stroke reversing valve is connected to the filter cooling cycle mechanism, and the vacuum generator is connected to an exhaust check valve for discharging gas. ; The vacuum generator is a reciprocating vacuum pump. When the reciprocating vacuum pump moves to the maximum displacement, the degassing and dehydration mechanism generates the maximum degree of vacuum, the high-speed reversing valve reverses direction, and the hydraulic medium output from the filtered cooling cycle mechanism enters In the degassing and dehydration mechanism, the air and moisture in the hydraulic medium are separated. 2. The adaptive closed hydraulic oil tank according to claim 1, characterized in that: the filtering and cooling circulation mechanism includes an oil suction filter connected to the oil tank body, a cooling circulation pump device connected to the oil suction filter, and a cooling system. The circulation pump device is connected to a pressure oil filter and a plate heat exchanger is connected to the pressure oil filter; the plate heat exchanger is connected to the high-speed stroke reversing valve. 3. The adaptive closed hydraulic oil tank according to claim 2, characterized in that: the liquid-gas isolation mechanism includes a bladder-isolated energy accumulator connected to the tank body and a bladder-isolated energy accumulator arranged between the fuel tank body and the bladder-isolated energy storage device. shut-off valve between devices. 4. The adaptive closed hydraulic oil tank according to claim 3, characterized in that the high-speed stroke reversing valve is connected to the inside of the oil tank body. 5. The adaptive closed hydraulic tank according to claim 1, wherein the degassing and dehydration mechanism further includes a pressure gauge switch connected to the damping channel and a vacuum gauge connected to the pressure gauge switch. 6. The adaptive closed hydraulic oil tank according to claim 5, characterized in that: a magnetic flap level gauge for detecting liquid level is provided on the side of the oil tank body. 7. The adaptive closed hydraulic oil tank according to claim 1, characterized in that: a wave structure for lengthening the length of the flow channel is provided inside the oil tank body. 8. The adaptive closed hydraulic oil tank according to claim 7, characterized in that: the bottom of the oil tank body forms an angle of 5-10° with respect to the horizontal direction, and the lowest point of the oil tank body is provided with a hole for discharging impurities. drain shut-off valve.