CN209945514U - High liquid level test system of aircraft refueling vehicle - Google Patents
High liquid level test system of aircraft refueling vehicle Download PDFInfo
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- CN209945514U CN209945514U CN201920942032.1U CN201920942032U CN209945514U CN 209945514 U CN209945514 U CN 209945514U CN 201920942032 U CN201920942032 U CN 201920942032U CN 209945514 U CN209945514 U CN 209945514U
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- 238000012360 testing method Methods 0.000 title claims abstract description 103
- 239000007788 liquid Substances 0.000 title claims abstract description 60
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000007667 floating Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000009423 ventilation Methods 0.000 claims description 6
- 238000005188 flotation Methods 0.000 abstract description 4
- 230000001815 facial effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Abstract
The utility model relates to an aircraft refueling vehicle high liquid level test system belongs to tank vehicle liquid level control technical field. The system comprises an oil filling bottom valve and an oil filling bottom valve at the bottom of an oil tank, a high liquid level switch and a breather valve at the top of the oil tank; a valve core linked with the bottom buoy is arranged in the high liquid level switch; the bottom of the floating barrel is provided with a test air cavity which can expand vertically and stretch elastically; the test air cavity is respectively communicated with the oil tank and the air transmission source through the on-off switching control piece; when the oil is filled, the on-off switching control element is in a state that the test air cavity is communicated with the oil tank to block the air source; when the buoy is tested, the on-off switching control piece is in a state that the test air cavity is communicated with the air source to block the oil tank. The utility model discloses ingenious test air cavity has been solved because of the unable normal oil filling problem that the negative pressure inflation leads to can accomplish the high liquid level test of flotation pontoon with the help of the facial make-up air supply, thereby made things convenient for test operation greatly.
Description
Technical Field
The utility model relates to a refuel car high liquid level test system, especially an aircraft refuel car high liquid level test system belong to tank vehicle liquid level control technical field.
Background
As shown in fig. 1, it is common for aircraft fuelling vehicles to have a bottom tank 1 with a bottom fill valve 2 and a bottom fill valve 5 at the bottom and a top level switch 3 at the top, the high level switch 3 having an air inlet P on one side communicating with an air source G and an air outlet a on the other side communicating with a bottom valve switch 4 and having a float bowl 3-1 inside which is connected to a spool. When the float bowl is in a sinking position, the valve core is in an opening state which enables the air inlet to be communicated with the air outlet, and when the float bowl is in a floating position, the valve core is in a stopping state which enables the air inlet to be not communicated with the air outlet; the bottom valve switch has an open state corresponding to the on state of the high liquid level switch and an off state corresponding to the off state of the high liquid level switch. Therefore, in the process of loading oil by the oil loading bottom valve, when the oil tank is not full and the high liquid level switch is in an opening state because the floating barrel is not floated, the bottom valve switch is in an openable ventilation state under the action of air pressure from an upper oil loading air source (high-pressure air source), the oil loading bottom valve is opened under the action of the air pressure after the bottom valve switch is controlled to be in the ventilation state, and the oil loading bottom valve continues to load the oil into the oil tank; when the oil tank is full and the high liquid level switch is in a cut-off state due to floating of the floating barrel, the bottom valve switch is automatically in a gas-off state under the self-resetting action, and the oil-loading bottom valve automatically resets and closes after losing pressure, so that oil loading is stopped continuously and oil in the oil tank is prevented from flowing back.
In essence, the high level switch shown in fig. 1 is used in series with a pneumatically controlled oil bottom valve, and when the oil in the tank is loaded to a predetermined height, the float bowl in the high level switch floats upwards to trigger the valve core to cut off the air passage, thereby closing the oil bottom valve. The opening and closing performance of the high liquid level switch not only determines whether the oil filling operation can be normally operated, but also concerns about the oil filling safety, so that the buoy of the high liquid level switch needs to be checked regularly.
The existing high liquid level switch test structure is shown in figure 2, the upper part of the high liquid level switch is inserted on an oil tank 1 through a flange 1-1, the bottom of a buoy 3-1 connected with a valve core in the high liquid level switch is provided with a test air cavity 3-2 capable of expanding vertically and elastically, and the test air cavity 3-2 is connected to a test port 3-3 of an external air source through a pipeline. During testing, only a proper amount of gas is injected into the testing gas cavity, the testing gas cavity can expand and jack up the buoy to simulate the floating of the buoy after oil is loaded, and after the gas in the testing gas cavity is released, the testing gas cavity recovers and the buoy resets accordingly; therefore, the aim of testing whether the buoy is normal can be fulfilled. The sensitivity of the test structure is high, but the test air cavity can not be directly connected with a high-pressure air source for an airplane refueling truck, otherwise, the test air cavity is easily damaged by continuous high pressure. Therefore, at present, an air pump is often equipped, and the air pump is used for inflating the test port and then observing the test port during testing. The simple method is complicated in operation and low in efficiency, and therefore suffers from the following problems.
A more serious problem is that the tank 1 of the aircraft fuelling vehicle is provided with a breather valve 6, as required by the relevant standards (QC/T1064 and 2017 road transport flammable liquid hazardous cargo tank vehicle breather valve). Because the air suction opening pressure of the breather valve is-4 kPa to-2 kPa, the oil tank always keeps negative pressure during the oil filling process, at the moment, the gas in the test gas cavity expands to enable the test gas cavity to jack up the buoy as in a test state, and as a result, the oil filling bottom valve is always kept in a closed state and cannot be normally switched to oil filling operation.
Disclosure of Invention
The utility model discloses a first aim at: aiming at the problems in the prior art, the high liquid level test system can avoid the expansion of a test air cavity due to negative pressure, thereby ensuring the normal refueling and oil filling of an aircraft refueling truck.
The utility model discloses further aim at: the airplane refueling vehicle high liquid level testing system can ensure that a testing air cavity is not damaged when the buoy high liquid level test is completed by means of an upper air source, and meanwhile, a corresponding testing method is provided, so that the testing operation is greatly facilitated.
In order to reach above first purpose, the utility model discloses aircraft refueling vehicle high liquid level test system's technical scheme as follows: the device comprises an oil filling bottom valve and an oil filling bottom valve which are arranged at the bottom of an oil tank, and a high liquid level switch and a breather valve which are arranged at the top of the oil tank; the high liquid level switch is externally provided with an air inlet and an air outlet, and is internally provided with a valve core linked with the bottom buoy; when the float bowl is in a sinking position, the valve core is in an opening state which enables the air inlet to be communicated with the air outlet; when the buoy is in a floating position, the valve core is in a cut-off state which enables the air inlet and the air outlet to be blocked; the oil filling bottom valve is provided with a controlled opening state corresponding to the ventilation state of the air control bottom valve switch and a reset closing state corresponding to the air-off reset state of the air control bottom valve switch; the bottom of the floating barrel is provided with a test air cavity capable of expanding vertically and elastically stretching;
the test air cavity is respectively communicated with the oil tank and the air transmission source through an on-off switching control piece; when the oil is filled, the on-off switching control element is in a state that the test air cavity is communicated with the oil tank to block the gas transmission source; when the buoy is tested, the on-off switching control piece is in a state that the test air cavity is communicated with the air transmission source to block the oil tank.
When refueling, because with jar interior and test air cavity intercommunication, consequently kept pressure balance, refuel the operation in-process test air cavity and can not expand because of the oil tank negative pressure to guarantee that the tank service truck normally refuels and subsequent oil filling. When the buoy needs to be tested, the on-off switching control piece is switched to the testing air cavity to be communicated with the air transmission source so as to block the state of the oil tank, and the test buoy is very convenient.
In order to achieve a further purpose, the gas transmission source adopts an upper air source, the testing gas cavity is branched through a testing port through a first two-position three-way gas control valve and an on-off switching control piece and then is connected with the upper air source and an air inlet of the high liquid level switch, the first two-position three-way gas control valve is provided with a gas pressure driving on position and a pressure relief resetting position, and an air outlet of the high liquid level switch is further branched and communicated with the gas pressure driving air inlet of the first two-position three-way gas control valve.
Thus, when the fuelling vehicle is not fully loaded, a high liquid level test is carried out, the upper loading gas source switch is opened to enable high-pressure gas to enter from the gas inlet P and exit from the gas outlet A of the high liquid level switch, and the high-pressure gas is led to the pneumatic driving gas inlet of the first two-position three-way pneumatic control valve to enable the valve to be in a connection position; and then, the air source and the air path are controlled to be communicated, so that high-pressure air is communicated to the testing port of the high liquid level switch, the testing air cavity expands and the buoy floats under normal conditions, the valve core of the high liquid level switch blocks the air inlet and the air outlet, the air pressure of the first two-position three-way air control valve drives the air inlet to be cut off, the first two-position three-way air control valve resets to block the air path, and the continuous air transmission of the testing air cavity is cut off. The result flotation pontoon sinks at the action of gravity and resets, and the test air cavity loses heart, and the case switches over to the open mode of air inlet and gas outlet intercommunication, and high liquid level switch's P, A mouths put through once more, and the process above the repetition, the reciprocal lift of flotation pontoon, until the test observation is accomplished, control and block the air supply gas circuit, stop the test. The continuous input of the gas at the test port is cut off in due time by skillfully utilizing the self feedback of the high liquid level switch, so that the test gas cavity can be ensured to be intact when the high liquid level test of the buoy is carried out by means of a high-pressure gas source.
The utility model discloses further perfect is: the on-off switching control piece is formed by combining a second two-position three-way pneumatic control valve and an on-off control valve, and the upper air source is communicated with an air pressure driving air inlet of the second two-position three-way pneumatic control valve through the on-off control valve; the second two-position three-way pneumatic control valve is provided with a branch passage position which is driven by air pressure and is communicated with the upper air source and the air inlet at the same time, and a tank through position which is decompressed, reset and communicated with the oil tank.
The utility model discloses further perfection is again: and a quick exhaust valve is arranged between the air control bottom valve switch and the oil filling bottom valve.
Drawings
Fig. 1 is a schematic structural diagram of a high liquid level testing system of a refueling truck in the prior art.
Fig. 2 is a schematic diagram of a test structure of a high level switch of the prior art.
Fig. 3 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a second embodiment of the present invention.
Detailed Description
Example one
The aircraft refueling vehicle high liquid level testing system of the embodiment is as shown in fig. 3, an oil filling bottom valve 2 (HDF Qs-100/10C type of Chongqing science and technology development Co., Ltd.) and an oil filling bottom valve 5 (the same as the oil filling bottom valve) are arranged at the bottom of an oil tank 1, and a high liquid level switch 3 (HANV-3 SP-500 type of Eulbeck F.A. sensing Co., Ltd. Germany) and a breather valve 6 (KT 031 type of Karpc liquid flow apparatus Co., Ltd. Changzhou) are arranged at the top of the oil tank 1. The high liquid level switch 3 is externally provided with an air inlet P and an air outlet A, and is internally provided with a valve core linked with the bottom float 3-1. Referring to fig. 2, the bottom of the buoy 3-1 is provided with a bellows type test air cavity 3-2 which can expand vertically and stretch elastically. The air outlet A is communicated with an air control bottom valve switch 4 and an air pressure driving air inlet of the air control bottom valve switch 4, which control the oil filling bottom valve 2 through a quick exhaust valve 12 (VSC-554-1/4 model of Shanghai Kangmao pneumatic control element Co., Ltd.), namely the quick exhaust valve 12 is arranged between the air control bottom valve switch 4 and the oil filling bottom valve 3. The test air cavity is respectively communicated with the oil tank 1 and a special test gas transmission source G' through a test port 3-3 positioned on the high liquid level switch 3 and a two-position three-way ball valve 8 serving as an on-off switching control piece. The quick exhaust valve 12 can play a role in accelerating the exhaust of the air chamber of the oil filling bottom valve, so that the oil filling bottom valve is closed at a higher speed. In the figure 9 is a built-in quick exhaust valve and Z is a high level indicator.
When oil is added, the two-position three-way ball valve is operated to enable the test air cavity to be communicated with the oil tank and block an air transmission source; because the tank is communicated with the test air cavity, the pressure balance between the tank and the test air cavity is always kept, and the negative pressure expansion of the test air cavity in the oiling operation process is thoroughly avoided, and the oil bottom valve is kept in a closed state and can not be normally switched to the oil filling operation. When the buoy needs to be tested, the two-position three-way ball valve is controlled to be switched to the testing air cavity to be communicated with the air transmission source so as to block the communication with the oil tank, and then a proper amount of gas can be injected into the testing air cavity to expand the testing air cavity, and the buoy is jacked up as the oil material is loaded under normal conditions; and after the gas of the test gas cavity is released, the test gas cavity is recovered, and the buoy is reset.
Example two
The high liquid level testing system of the refueling truck of the embodiment is shown in fig. 4, and the basic structure is the same as that of the first embodiment. Because the gas transmission source also adopts facial make-up air supply G, in order to avoid lasting high pressure to make the test air cavity impaired, this embodiment has add: the testing air cavity is connected with an air loading source G and an air inlet P of the high liquid level switch 3 through a testing port 3-3 through a first two-position three-way air control valve 7 and a back branch of an on-off switching control piece, and an air outlet A of the high liquid level switch 3 is also communicated with an air pressure driving air inlet of the first two-position three-way air control valve 7 through a four-way 10 branch. The first two-position three-way pneumatic control valve 7 is provided with a pneumatic drive connection position and a pressure relief resetting disconnection position.
Although the on-off switching control member may be a single two-position three-way ball valve or a two-position three-way manual valve as in the first embodiment, in order to realize the "one-key operation" of the oil filling and the testing, the on-off switching control member is formed by combining a second two-position three-way pneumatic control valve 8 'and an on-off control valve 8 ", the air source G is communicated with the pneumatic driving air inlet of the second two-position three-way pneumatic control valve 8' through the on-off control valve 8", the second two-position three-way pneumatic control valve 8 'has a branch passage position where the pneumatic driving is communicated with the air source G and the air inlet P of the high liquid level switch 3 through a branch of a four-way valve 11', and the.
When refueling, open the facial make-up air supply, the flotation pontoon will be in the position of sinking, the air supply advances through P mouth, A mouthful goes out, control first two position three-way valve 7 is in the switch-on position, control the air supply of second two three-way air control valve 8' air pressure drive air inlet of switch-on/off control valve 8 "control disconnection this moment, make it be in the logical jar position of switch-on oil tank 1, can make jar interior and test air cavity intercommunication, keep pressure balance between them, the inflation can not appear in the test air cavity among the operation process of refueling to guarantee aircraft tank service truck normally refuel and oil charging. In the oil loading process, when the oil tank is not filled with the oil float 3-1 and is at a sinking position, the valve core is linked to be in an opening state which enables the air inlet P to be communicated with the air outlet A, the air control bottom valve switch 4 is in an opening ventilation state which can be controlled to be opened, and once the ventilation state is opened, the oil loading bottom valve 2 is opened under the action of air pressure to allow oil to be loaded. When the oil tank is filled with the oil float 3-1 and is positioned at a floating position, the valve core is linked to be in a stop state which enables the air inlet P and the air outlet A to be blocked, the air control bottom valve switch 4 is reset to be in an air closing and cutting-off state, the oil filling bottom valve 2 automatically resets and closes after air pressure is lost, oil loading is stopped continuously, and oil in the oil tank is prevented from flowing back.
When a high liquid level test is required to be carried out when the fuelling vehicle is not fully loaded, the gas source G switch is opened to enable high-pressure gas to enter from the port P and exit from the port A of the high liquid level switch 3 and lead to the air pressure driving air inlet of the first two-position three-way pneumatic control valve 7, so that the valve is in a connection position; then, the on-off control valve 8 ' is switched to control and connect the air source of the air pressure driving air inlet of the second two-position three-way air control valve 8 ', so that the air source is positioned at a branch passage position which is connected with the air source G and the air inlet P of the high liquid level switch 3 through the four-way valve 11 '. Thereafter, the high pressure gas is led to the test port of the high liquid level switch 3; under normal conditions, the test air cavity 3-2 expands, the buoy 3-1 floats, the valve core of the high liquid level switch 2 blocks the air inlet P and the air outlet A, so that the air pressure of the first two-position three-way pneumatic control valve 7 drives the air inlet to cut off air, the first two-position three-way pneumatic control valve 7 resets to cut off the air circuit, and the continuous air transmission of the test air cavity 3-2 is cut off. As a result, the buoy 3-1 sinks and resets under the action of gravity, the test air cavity 3-2 leaks air, the valve core is switched to the opening state that the air inlet P is communicated with the air outlet A, the P, A port of the high liquid level switch 3 is communicated again, the processes are repeated, the buoy 3-1 rises and falls in a reciprocating mode until the test observation is finished, and the test can be stopped by blocking the air source air circuit.
Therefore, the problems of difficult oiling and subsequent oil filling caused by expansion of the test air cavity due to negative pressure of the oil tank are properly solved, the air pressure feedback of the high liquid level switch is skillfully utilized to cut off the gas at the test port in time, and the test air cavity is prevented from being damaged; and the switching of refueling oil loading and test all can through controlling the on-off control valve, very convenient.
In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.
Claims (4)
1. A high liquid level test system of an aircraft refueling truck comprises an oil filling bottom valve (2) and a refueling bottom valve (5) which are arranged at the bottom of an oil tank (1), and a high liquid level switch (3) and a breather valve (6) which are arranged at the top of the oil tank; the high liquid level switch is externally provided with an air inlet (P) and an air outlet (A), and is internally provided with a valve core linked with the bottom float bowl (3-1); when the float bowl is in a sinking position, the valve core is in an opening state which enables the air inlet to be communicated with the air outlet; when the buoy is in a floating position, the valve core is in a cut-off state which enables the air inlet and the air outlet to be blocked; the air outlet is communicated with an air control bottom valve switch (4) for controlling the oil filling bottom valve and an air pressure driving air inlet of the air control bottom valve, and the oil filling bottom valve is provided with a controlled opening state corresponding to the ventilation state of the air control bottom valve switch and a reset closing state corresponding to the air-off reset state of the air control bottom valve switch; the bottom of the buoy is provided with a test air cavity (3-2) which can expand vertically and stretch elastically; the method is characterized in that:
the test air cavity is respectively communicated with the oil tank and the air transmission source through an on-off switching control piece; when oil is added, the on-off switching control element is in a state that the test air cavity is communicated with the oil tank to block an air source; when the buoy is tested, the on-off switching control piece is in a state that the test air cavity is communicated with the air source to block the oil tank.
2. The aircraft refueling vehicle high liquid level testing system as claimed in claim 1, wherein: the gas transmission source adopts an upper air source, the testing air cavity is branched to be connected with the upper air source and the air inlet of the high liquid level switch through a testing port through a first two-position three-way pneumatic control valve and an on-off switching control piece, the first two-position three-way pneumatic control valve is provided with a pneumatic drive connection position and a pressure relief resetting disconnection position, and the air outlet of the high liquid level switch is further branched to be communicated with the pneumatic drive air inlet of the first two-position three-way pneumatic control valve.
3. The aircraft refueling vehicle high liquid level testing system as claimed in claim 2, wherein: the on-off switching control piece is formed by combining a second two-position three-way pneumatic control valve and an on-off control valve, and the upper air source is communicated with an air pressure driving air inlet of the second two-position three-way pneumatic control valve through the on-off control valve; the second two-position three-way pneumatic control valve is provided with a branch passage position which is driven by air pressure and is communicated with the upper air source and the air inlet at the same time, and a tank through position which is decompressed, reset and communicated with the oil tank.
4. An aircraft refueling vehicle high liquid level testing system as claimed in claim 3, wherein: and a quick exhaust valve is arranged between the air control bottom valve switch and the oil filling bottom valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920942032.1U CN209945514U (en) | 2019-06-21 | 2019-06-21 | High liquid level test system of aircraft refueling vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920942032.1U CN209945514U (en) | 2019-06-21 | 2019-06-21 | High liquid level test system of aircraft refueling vehicle |
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| CN209945514U true CN209945514U (en) | 2020-01-14 |
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| CN201920942032.1U Withdrawn - After Issue CN209945514U (en) | 2019-06-21 | 2019-06-21 | High liquid level test system of aircraft refueling vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110160607A (en) * | 2019-06-21 | 2019-08-23 | 航天晨光股份有限公司 | A kind of aircraft bowser high liquid level test macro |
| CN110217505A (en) * | 2019-06-21 | 2019-09-10 | 航天晨光股份有限公司 | A kind of tank service truck high liquid level test macro |
-
2019
- 2019-06-21 CN CN201920942032.1U patent/CN209945514U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110160607A (en) * | 2019-06-21 | 2019-08-23 | 航天晨光股份有限公司 | A kind of aircraft bowser high liquid level test macro |
| CN110217505A (en) * | 2019-06-21 | 2019-09-10 | 航天晨光股份有限公司 | A kind of tank service truck high liquid level test macro |
| CN110160607B (en) * | 2019-06-21 | 2023-12-12 | 航天晨光股份有限公司 | High liquid level test system of aircraft refueling truck |
| CN110217505B (en) * | 2019-06-21 | 2024-03-29 | 航天晨光股份有限公司 | High liquid level test system of refueling truck |
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