阅读说明：本技术 液压系统隔离肺装置 (Lung isolation device of hydraulic system ) 是由 杨棋君 于 2019-03-24 设计创作，主要内容包括：本发明公开了一种液压系统隔离肺装置,储气装置的上端空腔通过管路与油箱连通,储气装置的上端空腔通过隔板设有气压调节装置。本发明的储气装置安装在主架内,内部储气装置为全封闭式结构,通过封闭管路与油箱连接,以保证油箱内部气体交换功能,正常状态下油箱液位变化所需的气体由气囊内的干燥洁净气体循环提供,所以不与外界气体交换,特殊状态下的放气与欠压也仅是极少量气体的进出,所以不会堵塞进出气口。(The invention discloses a lung isolating device of a hydraulic system. The air storage device is arranged in the main frame, the internal air storage device is of a totally enclosed structure and is connected with the oil tank through a closed pipeline so as to ensure the internal air exchange function of the oil tank, air required by the liquid level change of the oil tank in a normal state is circularly provided by dry clean air in the air bag, so that the air storage device is not exchanged with external air, and air release and under-pressure in a special state are only the inlet and outlet of a small amount of air, so that an air inlet and an air outlet cannot be blocked.)

1. A hydraulic system lung isolation device, comprising: the upper end cavity of the gas storage device (1) is communicated with the oil tank (22) through a pipeline, and the upper end cavity of the gas storage device (1) is provided with a gas pressure adjusting device through a partition plate (5).

2. The hydraulic system lung isolation apparatus of claim 1 wherein: the gas storage device (1) is arranged in the main frame (2), and the bottom of the main frame (2) is provided with a protective net (19).

3. The hydraulic system lung isolation apparatus of claim 1 wherein: the cavity is the inner cavity of upper cover (3), and baffle (5) set up the inner cavity in upper cover (3), divide into upper cavity (31) and lower cavity (32) with the inner cavity of upper cover (3), set up air pressure adjusting device in the central through hole of baffle (5).

4. The hydraulic system lung isolation apparatus of claim 1 wherein: the air pressure adjusting device comprises a two-way safety valve (6), and the diameter of the periphery of the two-way safety valve (6) is matched with the diameter of the central through hole of the partition plate (5).

5. The hydraulic system isolation lung device of claim 4, wherein: the two-way safety valve is characterized in that a sealing ring (12) is arranged in the two-way safety valve (6), an upper boss (16) and a lower boss (25) are arranged at the center of the sealing ring (12), the upper boss (16) and the lower boss (25) are fixedly connected with a pressing sleeve (17) and a sliding rod (14) respectively, and elastic elements are sleeved on the pressing sleeve (17) and the sliding rod (14) respectively.

6. The hydraulic system lung isolation apparatus of claim 1 wherein: the device also comprises a filtering and drying device (8), wherein the filtering and drying device (8) is arranged in the upper cavity (31); the filtering and drying device (8) is arranged on the periphery of the two-way safety valve (6).

7. The hydraulic system lung isolation apparatus of claim 3 wherein: a plurality of air holes (15) are formed in the position, corresponding to the upper cavity (31), of the outer surface of the upper cover (3), the air holes (15) are communicated with the atmospheric environment, a joint is arranged in the position, corresponding to the lower cavity (32), of the outer surface of the upper cover (3), and the oil tank (22) is connected with the joint through a pipeline.

8. The hydraulic system isolation lung device of claim 4, wherein: the two-way safety valve (6) is respectively provided with through holes (13) on the outer surface of the upper part and the lower part of the sealing ring (12).

9. The hydraulic system lung isolation apparatus of claim 1 wherein: the bottom of the gas storage device (1) is provided with a liquid outlet (18), and a liquid outlet switch device (24) is arranged at the liquid outlet (18).

10. The hydraulic system lung isolation apparatus of claim 1 wherein: the opening sleeve (4) of the gas storage device (1) is internally provided with a filtering and drying net (23).

Technical Field

The invention relates to the technical field of hydraulic pressure, in particular to a lung isolating device of a hydraulic system.

Background

In a hydraulic system, an oil tank is an indispensable oil storage device, most of the hydraulic systems are open systems at present, and the oil tank matched with the hydraulic systems is an open oil tank. Because the diameters of the rod diameter and the plug diameter of the hydraulic cylinder are different and the hydraulic components are different, the oil quantity of an oil tank is unequal due to the fact that the hydraulic cylinder moves forwards and backwards in normal work of a hydraulic system, namely the oil level height of the oil tank can be changed at any time, in order to guarantee normal work of the system, the oil tank cannot be arranged into a closed container, and therefore the common hydraulic system is arranged into an open structure communicated with the atmosphere. The working principle of the open type oil tank is that when the oil level in the oil tank rises, air above the oil level is discharged into the atmosphere through the common air filtering vent, so that the pressure of the oil tank cannot be increased; when the oil level drops, the atmosphere enters the oil tank through the air port, so that the pressure of the oil tank cannot be reduced. Because the amount of oil liquid in an oil tank of most hydraulic systems is greatly changed during working, the amount of air for supplement and discharge is large, and the requirement on supplement and discharge time is short, a relatively coarse air filter is generally selected or a certain safety ventilation coefficient is enlarged conventionally, during actual working, along with the descending of the oil level of the oil tank, air entering from the atmosphere contains various pollutants and water vapor, and after entering the tank through an air vent of the oil tank, the air is easy to oxidize or corrode hydraulic oil in the oil tank to pollute the hydraulic oil, the traditional open structure hydraulic system exchanges with outside air every time when executing one action (liquid level ascending or descending), and outside air carries pollution sources (dust and water vapor) to enter continuously, so that a filter screen of the air vent is relatively easy to block, and the dust and the water vapor are easy to enter the oil to cause quick damage of the oil, the failure is frequent, so the higher the frequency of use of such hydraulic systems, the faster the oil becomes contaminated. The hydraulic oil with serious pollution can cause damage to a hydraulic system, and the damage is mainly manifested by increased faults of all components of the system, poor reliability, low efficiency, high cost, short service life and the like.

If chinese utility model patent CN203476855U discloses a hydraulic tank, the box that holds oil is equipped with gas outlet and gasbag intercommunication, is equipped with pressure regulator on the passageway that box business turn over gas port and gasbag communicate, and oil pipe seals in inserting the oil tank. The air bag is communicated with the cavity on the liquid level of the oil tank to adjust the change of the internal pressure of the oil tank caused by the change of the liquid level, so that the direct contact between the oil level of the existing open oil tank and the gas mixed with various harmful components is avoided, but the air in the air bag of the hydraulic oil tank still comes from the atmosphere without being filtered, and the gas in the atmosphere still can carry impurities and water vapor into the hydraulic oil tank in the air inlet and outlet adjusting process, so that the hydraulic oil is polluted, and the fault of a hydraulic system is caused.

Like chinese utility model patent CN204704169U discloses a hydraulic system gasbag formula constant voltage closed oil tank, through falling into oil absorption district and oil return district with the box of closed oil tank to set up the complete sealing that complicated control element realized the oil tank in the box, thereby guarantee cleanliness and oil quality. However, the air bag type constant-pressure closed oil tank of the hydraulic system has a complex structure and has requirements on the pressure resistance of the oil tank, related pressure resistance tests are required before use, and the test cost is high; meanwhile, a control element needs to be additionally arranged, so that the equipment cost investment is high, and the economic applicability is low.

Disclosure of Invention

The applicant aims at the defects that the closed oil tank of the existing hydraulic system is complex in structure, high in pressure resistance test cost and equipment input cost, low in economic applicability and the like, and provides a hydraulic system isolation lung device reasonable in structure.

The technical scheme adopted by the invention is as follows:

a lung isolating device of a hydraulic system is characterized in that a cavity at the upper end of a gas storage device is communicated with an oil tank through a pipeline, and a gas pressure adjusting device is arranged in the cavity at the upper end of the gas storage device through a partition plate.

As a further improvement of the above technical solution:

the gas storage device is arranged in the main frame, and the bottom of the main frame is provided with a protective net.

The cavity is the inner cavity of the upper cover, the partition board is arranged in the inner cavity of the upper cover, the inner cavity of the upper cover is divided into an upper cavity and a lower cavity, and the air pressure adjusting device is arranged in the central through hole of the partition board.

The air pressure adjusting device comprises a two-way safety valve, and the diameter of the periphery of the two-way safety valve is matched with the diameter of the central through hole of the partition plate.

The two-way safety valve is characterized in that a sealing ring is arranged in the two-way safety valve, an upper boss and a lower boss are arranged in the center of the sealing ring, the upper boss and the lower boss are respectively and fixedly connected with a pressing sleeve and a sliding rod, and elastic elements are respectively sleeved on the pressing sleeve and the sliding rod.

The filter drying device is arranged in the upper cavity; the filtering and drying device is arranged on the periphery of the two-way safety valve.

A plurality of air holes are formed in the position, corresponding to the upper cavity, of the outer surface of the upper cover, the air holes are communicated with the atmospheric environment, a joint is arranged in the position, corresponding to the lower cavity, of the outer surface of the upper cover, and the oil tank is connected with the joint through a pipeline.

The outer surfaces of the two-way safety valve, which are positioned at the upper part and the lower part of the sealing ring, are respectively provided with a through hole.

The bottom of the gas storage device is provided with a liquid outlet, and the liquid outlet is provided with a liquid outlet switch device.

The opening sleeve of the gas storage device is internally provided with a filtering and drying net.

The invention has the following beneficial effects:

the air storage device is arranged in the main frame, the internal air storage device is of a totally enclosed structure and is connected with the oil tank through a closed pipeline so as to ensure the internal air exchange function of the oil tank, air required by the liquid level change of the oil tank in a normal state is circularly provided by dry clean air in the air bag, so that the air storage device is not exchanged with external air, and air release and under-pressure in a special state are only the inlet and outlet of a small amount of air, so that an air inlet and an air outlet cannot be blocked.

The top of the invention is provided with the two-way safety valve, and a high-precision gas filtering and drying device is arranged between the two-way safety valve and the outside air, so that the gas entering and exiting the two-way safety valve is ensured to be clean and dry. Because the hydraulic system can produce oil mist in the operation process, the gas is filtered and dried in time when being discharged, the oil mist is effectively prevented from leaking, and the environment is protected from being polluted.

When the internal air storage device is in a normalized state, the internal air pressure and the external air pressure are balanced, and the sealing ring and the partition plate in the middle of the two-way safety valve are in the same horizontal position, so that the internal air storage device is completely sealed and isolated from an air source; when the air pressure of the internal air storage device is smaller than the atmospheric pressure, the two-way safety valve slides downwards, and external air is filtered and dried and then is supplemented to enter the internal air storage device through the through hole on the two-way safety valve so as to balance the internal air pressure; when the air pressure of the internal air storage device is larger than the atmospheric pressure, the two-way safety valve slides upwards, and the air in the air storage device is discharged to the atmospheric environment through the through hole on the two-way safety valve. The internal gas storage device is in a sealing state in a normal working state, gas is supplied only when the gas storage device is short of gas, and the gas filtering and drying device plays a role in filtering and drying during gas supply so as to ensure cleanness and drying of the supplied gas.

According to the invention, the protective net is arranged at the bottom of the main frame, the main frame can protect the air storage device, the air storage device is prevented from being damaged by external force during carrying or working, and the protective net can prevent external mosquitoes or small animals from entering the air storage device to bite down.

The invention can strictly isolate the oil in the oil tank from the atmospheric environment, prevent pollutants and moisture in the air from entering the oil tank, and ensure the drying and cleaning of the air and the quality of oil products. The invention has simple integral structure, can solve overpressure deflation and underpressure air supply through the up-and-down movement of the two-way safety valve, can flexibly control and adjust the up-and-down movement of the two-way safety valve through the air pressure difference between the internal air storage device and the atmospheric pressure, does not need to add additional control elements, and reduces the investment cost of equipment. The invention has no pressure resistance requirement on the oil tank, can be suitable for wide and common oil tanks, and has good economic applicability.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a right side view of the present invention.

FIG. 3 is a cross-sectional view of a gas storage device of the present invention in its normal state.

FIG. 4 is a cross-sectional view of a gas storage device of the present invention when deflated.

Fig. 5 is a sectional view of the air storage device of the present invention when inflated.

Fig. 6 is an enlarged view of a portion a in fig. 3.

Fig. 7 is a perspective view of the two-way relief valve.

Fig. 8 is a working principle diagram of the present invention.

In the figure: 1. a gas storage device; 2. a main frame; 3. an upper cover; 4. opening the sleeve; 5. A partition plate; 6. a two-way safety valve; 7. a spring; 8. a filtering and drying device; 9. A first connector; 10. a second joint; 11. a support; 12. a seal ring; 13. a through hole; 14. a slide bar; 15. air holes; 16. an upper boss; 17. pressing the sleeve; 18. a liquid discharge port; 19. a protective net; 20. quickly connecting a plug; 21. a barometer; 22. an oil tank; 23. filtering and drying the net; 24. A liquid discharge switch device; 25. a lower boss; 31. an upper cavity; 32. a lower cavity.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 and 2, the air storage device 1 of the present invention is disposed in a rectangular main frame 2, the upper end of the air storage device 1 is fixed to the main frame 2 through an opening sleeve 4, and a square upper cover 3 is fixedly disposed on the top of the main frame 2.

As shown in fig. 3 and 6, a horizontal partition plate 5 is arranged inside the upper cover 3, the partition plate 5 divides the inner cavity of the upper cover 3 into an upper cavity 31 and a lower cavity 32, a plurality of air holes 15 are formed in the outer surface of the upper cover 3 corresponding to the upper cavity 31, and the air holes 15 communicate the upper cavity 31 with the atmosphere; the lower cavity 32 is communicated with the gas storage device 1 through the open sleeve 4. In this example, the first joint 9 and the second joint 10 are arranged on the outer surface of the upper cover 3 at positions corresponding to the lower cavity 32. As shown in fig. 8, the first connector 9 is communicated with the fuel tank 22 through a pipeline, and the air pressure gauge 21 is connected between the first connector 9 and the fuel tank 22 to monitor the air pressure change in the system. The second connector 10 is communicated with the inflating device through a quick connector 20. The inner volume of the gas storage device 1 is significantly larger than the gas space of the fuel tank 22.

The annular filtering and drying device 8 is arranged in the upper cavity 31 and arranged at the periphery of the two-way safety valve 6, and the filtering and drying device 8 is used for filtering and drying air entering from the outside; the bracket 11 is positioned in the lower cavity 32 and fixed on the lower end surface of the partition plate 5, the cylindrical two-way safety valve 6 is arranged on the central through hole of the partition plate 5 through the bracket 11, and the peripheral diameter of the two-way safety valve 6 is matched with the diameter of the central through hole of the partition plate 5.

As shown in fig. 6 and 7, a sealing ring 12 is horizontally disposed in the middle position of the two-way safety valve 6 in the height direction, through holes 13 are respectively disposed on the outer surfaces of the two-way safety valve 6 at the upper and lower portions of the sealing ring 12, and in this example, a row of through holes 13 are respectively disposed on the outer surfaces of the two-way safety valve 6 at the upper and lower portions of the sealing ring 12. When the invention is in a normal state, the sealing ring 12 and the partition plate 5 are positioned at the same horizontal position, the upper row of through holes 13 is positioned in the upper cavity 31, and the lower row of through holes 13 is positioned in the lower cavity 32. An upper boss 16 and a lower boss 25 are arranged at the center of the sealing ring 12, as shown in fig. 3 and 6, a pressure sleeve 17 and a sliding rod 14 are vertically arranged on the central shaft of the two-way safety valve 6, and the pressure sleeve 17 is positioned in an upper cavity 31 and fixedly connected with the upper boss 16 through threads; the slide rod 14 is located in the lower cavity 32, and its upper end is fixedly connected with the lower boss 25 through a screw thread, and its lower end passes through the bracket 11. The pressing sleeve 17 and the sliding rod 14 are respectively sleeved with a spring 7, two ends of the spring 7 in the upper cavity 31 respectively abut against the upper cover 3 and the upper boss 16, and two ends of the spring 7 in the lower cavity 32 respectively abut against the lower boss 25 and the bracket 11. The two-way safety valve 6 keeps the position through the spring force of the lower end to realize the sealing of the internal gas storage device 1, and when the two-way safety valve 6 slides up and down, the two-way safety valve can reset through the spring force. The pressing sleeve 17 and the sliding rod 14 can also be sleeved with other elastic elements, and the position holding and the resetting after the sliding are realized through the elastic force of the elastic elements.

The two-way safety valve 6 can slide up and down along the inner hole wall of the central through hole of the partition plate 5, is always matched with the central through hole of the partition plate 5 in the sliding process, and the limit position of the upward sliding does not contact with the inner end surface of the upper cover 3, and similarly, the limit position of the downward sliding does not contact with the upper end surface of the horizontal part of the bracket 11. The sliding rod 14 and the pressing sleeve 17 can move up and down along with the two-way safety valve 6, and the sliding rod 14 is always matched with the through hole corresponding to the bracket 11 when moving upwards to the upper limit position.

A fixed circular filtering and drying net 23 is horizontally arranged in the opening sleeve 4 of the gas storage device 1, and when the gas storage device 1 contracts, the filtering and drying net 23 can limit the upward process of the gas storage device 1 and protect the filtering structure in the upper cover 3. The bottom of the gas storage device 1 is provided with a liquid outlet 18, the liquid outlet 18 is provided with a liquid outlet switch device 24, and when oil mist exists in the gas storage device 1 and is precipitated to a certain degree, the oil mist is discharged by opening the liquid outlet switch device 24. The bottom of body frame 2 is equipped with protection network 19, and body frame 2 can protect gas storage device 1, prevents that transport or during operation external force from damaging gas storage device 1, and protection network 19 can prevent that outside mosquito or toy from getting into and gnawing gas storage device 1.

The working principle and the working process of the invention are as follows:

the opening at the upper end of the gas storage device 1 is communicated with the first connector 9, the second connector 10 and the two-way safety valve 6, and the two-way safety valve 6 is communicated with the air hole 15 through the filtering and drying device 8.

In operation, as shown in fig. 1, the fuel tank 22 is connected to the first connector 9 through a pipeline, and the inflator is connected to the second connector 10 through the quick connector 20. The inflating device fills filtered clean air into the air storage device 1, and is closed until the sealing ring 12 of the two-way safety valve 6 is positioned at the same horizontal position with the partition plate 5; the air charging device can be a common air pump for pumping, filtering and drying the atmosphere, or can be pure inert gas such as a nitrogen bottle and the like, so as to ensure that the charged gas does not generate oxidation or water vapor and the like on the oil liquid. As shown in fig. 3, at this time, the air pressures at the upper end and the lower end of the two-way safety valve 6 are equal, there is no air pressure difference between the two, the air storage device 1 is in a normalized state, the air storage device 1 and the oil tank 22 form a closed system, when the oil level of the oil tank 22 drops, the volume of the air cavity in the oil tank 22 increases, and the air in the air storage device 1 is supplemented into the air cavity of the oil tank 22 through a pipeline to maintain the air pressure value in the oil tank 22; when the oil level of the oil tank 22 rises, the volume of the air chamber in the oil tank 22 decreases, and the air in the oil tank 22 enters the air storage device 1 through the pipeline.

As shown in fig. 4, when the gas storage device 1 is in a deflated state, the gas pressure at the upper part of the two-way safety valve 6 is greater than the gas pressure at the lower part, a positive pressure difference occurs, the gas pressure difference is greater than the spring force at the lower end of the two-way safety valve 6, the two-way safety valve 6 slides downwards, and the through hole 13 at the upper part of the two-way safety valve 6 is communicated with the upper cavity and the lower cavity, so as. The external atmosphere enters the inner cavity from the air hole 15, is filtered by the filtering and drying device 8 and then is supplemented into the gas storage device 1 from the through hole 13 at the upper part of the two-way safety valve 6, so that the internal air pressure of the system is kept balanced.

As shown in fig. 5, when the air pressure of the air storage device 1 increases and is in an expanded state, the air pressure at the upper part of the two-way safety valve 6 is smaller than the air pressure at the lower part, a negative pressure difference occurs, the air pressure difference is larger than the spring force at the upper end of the two-way safety valve 6, the two-way safety valve 6 slides upwards, and the through hole 13 at the lower part of the two-way safety valve 6 is communicated with the upper. The gas in the gas storage device 1 enters the atmospheric environment through the through hole 13 at the lower part of the two-way safety valve 6, and overpressure gas is discharged, so that the internal gas pressure of the system is kept balanced, and the safety is ensured.

The invention strictly isolates the oil in the oil tank 22 from the atmospheric environment, prevents pollutants and moisture in the air from entering the oil tank 22, and ensures the cleanliness of the air and the quality of the oil product; and the steps of filtering and drying are carried out simultaneously when the gas is discharged, so that the leakage of oil mist in a hydraulic system is effectively prevented, and the external environment is protected from being polluted. The two-way safety valve 6 is kept in a middle state during normal work, so that the gas in the gas storage device 1 is ensured to be pure; the problems of overpressure deflation and underpressure air supply can be solved through the up-and-down movement of the two-way safety valve 6 under special conditions, the up-and-down movement of the two-way safety valve 6 can be flexibly controlled and adjusted through the air pressure difference between the internal air storage device 1 and the atmospheric pressure, additional control elements are not required to be added, and the equipment investment cost is reduced.

The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, as the invention may be modified in any manner without departing from the spirit thereof.