Stepped pressure relief device, system and method for hydraulic system of aviation ground support equipment

Abstract

The invention discloses an aviation ground support equipment hydraulic system step pressure relief device, system and method, which comprises a pressure transmitter, pressure relief stop valve groups and an overflow valve, an integrated mounting block is of a rectangular structure, the pressure transmitter is arranged on one side of the integrated mounting block, the pressure relief stop valve groups are arranged at the upper end and the lower end of the integrated mounting block, and the overflow valve is arranged on the integrated mounting block. The overflow valve is arranged on the adjacent side of the pressure transmitter, the integrated mounting block is provided with an oil supply port and an oil return port, the oil supply port and the pressure transmitter are arranged on the same side, and the oil return port is arranged on the opposite side of the oil supply port; according to the stepped pressure relief method, a medium flowing channel is formed in an integrated mounting block, a pressure transmitter, a pressure relief stop valve set and an overflow valve are communicated through the integrated mounting block, the system pressure is quickly relieved to zero step by step in a two-stage pressure relief mode during pressure relief, the pressure relief time is short, and on the premise that the pressure relief time is not obviously prolonged, the pressure relief efficiency is greatly improved. And the pressure of the hydraulic system is quickly and safely released to zero, so that the influence on the safe operation of the aircraft hydraulic system is prevented.

Description

Technical Field

[0001] The present invention belongs to the technical field of aviation ground support equipment, and in particular relates to a stepped pressure relief device, system and method for a hydraulic system of aviation ground support equipment. Background Art

[0002] The pressure of hydraulic system of modern aircraft has been gradually increased from 3000PSI to 5000PSI, and even to 6000PSI for some models. As the pressure of hydraulic system of aircraft becomes higher and higher, the system pressure of corresponding ground support equipment also increases accordingly. The increased hydraulic system pressure has certain safety risks when the pressure is released. After the test of aviation ground support equipment is completed or when the system pipeline is difficult to connect or separate, the system pipeline needs to be depressurized. The traditional hydraulic system adopts proportional relief valve and electromagnetic relief valve to release pressure. When the equipment is in a high pressure state, the pressure is released to zero at one time. Due to the high system pressure, when the pressure relief is turned on, the oil in the hydraulic system flows rapidly under the huge pressure difference between the oil supply and return oil, and the oil backflow occurs at the filter, causing the filter element of the aircraft hydraulic system to collapse under the action of the reverse impact force, resulting in a serious accident of aircraft hydraulic system pollution. In addition, when the aviation ground support equipment is under long-term pressure maintenance, hydraulic sealing test, and hydraulic strength test, if the pressure relief device is not sealed well, the test will fail or affect the judgment of the test results due to leakage in the system. Summary of the invention

[0003] The object of the present invention is to provide a stepped pressure relief device, system and method for a hydraulic system of aviation ground support equipment. Through the stepped pressure relief method, a medium flow channel is provided in an integrated mounting block, and a pressure transmitter, a pressure relief stop valve group and a relief valve are connected through the integrated mounting block. During pressure relief, the system pressure is rapidly relieved to zero step by step through a two-stage pressure relief method. The pressure relief time is short. Under the premise of not significantly increasing the pressure relief time, the pressure of the hydraulic system is rapidly and safely relieved to zero, thereby preventing the safe operation of the aircraft hydraulic system from being affected.

[0004] The present invention is achieved through the following technical solutions: The step pressure relief device of the hydraulic system of aviation ground support equipment comprises a pressure transmitter, a pressure relief stop valve group and a relief valve, wherein the integrated mounting block is a rectangular structure, the pressure transmitter is arranged on one side of the integrated mounting block, the pressure relief stop valve group is arranged at the upper and lower ends of the integrated mounting block, the relief valve is arranged on the adjacent side of the pressure transmitter, and the integrated mounting block is used to connect the pressure transmitter, the pressure relief stop valve group and the relief valve; an oil supply port and an oil return port are arranged on the integrated mounting block, the oil supply port is arranged on the same side as the pressure transmitter, and the oil return port is arranged on the opposite side of the oil supply port.

[0005] Furthermore, the pressure relief stop valve group includes a first-level pressure relief stop valve and a second-level pressure relief stop valve, and the first-level pressure relief stop valve and the second-level pressure relief stop valve are arranged relatively to each other on the integrated mounting block; a first oil inlet hole and a first oil return hole are arranged at the position of the first-level pressure relief stop valve, and a second oil inlet hole and a second oil return hole are arranged at the position of the second-level pressure relief stop valve; the first oil inlet hole and the second oil inlet hole are both connected to the oil supply port; the first oil return hole is connected to the overflow valve, and the overflow valve is connected to the oil return port; the second oil return hole is connected to the oil return port.

[0006] Furthermore, a third oil inlet hole and a third oil return hole are provided on the integrated mounting block at the position of the overflow valve, the third oil inlet hole is communicated with the first oil return hole, and the third oil return hole is communicated with the oil return port.

[0007] The invention discloses a stepped pressure relief system for a hydraulic system of aviation ground support equipment, comprising an integrated installation unit, a pressure detection unit, a pressure relief unit and an overflow pressure relief unit, wherein the pressure detection unit, the pressure relief unit and the overflow pressure relief unit are respectively connected to the integrated installation unit, and the integrated installation unit enables the pressure detection unit, the pressure relief unit and the overflow pressure relief unit to communicate with each other; the pressure detection unit is used for detecting the oil inlet pressure of the hydraulic system, the pressure relief unit is used for stepped pressure relief, and the overflow pressure relief unit cooperates with the pressure relief unit for overpressure overflow.

[0008] Furthermore, the pressure relief unit includes a primary pressure relief element and a secondary pressure relief element, and the primary pressure relief element and the secondary pressure relief element are arranged opposite to each other on the integrated installation unit.

[0009] The step pressure relief method of the hydraulic system of aviation ground support equipment is to relieve the pressure of the hydraulic system through the step pressure relief device of the hydraulic system of aviation ground support equipment, and comprises the following steps: S1: Connect the oil supply port and oil return port of the pressure relief device to the pressure relief system and the equipment tank respectively, and connect the pressure relief device to the external control system; S2: Set the overpressure alarm value of the pressure transmitter and the opening threshold of the secondary pressure relief stop valve; S3: Set the opening threshold of the overflow valve; S4: When the system pressure exceeds the pressure alarm value, the first-level pressure relief stop valve is opened to release the pressure. When the pressure reaches the opening threshold of the second-level pressure relief stop valve, the second-level pressure relief valve is opened to release the pressure quickly.

[0010] Furthermore, the overpressure alarm value of the pressure transmitter is 110%-115% of the initial pressure of the system.

[0011] Furthermore, the opening threshold of the overflow valve is 50%-62.5% of the initial pressure of the system.

[0012] Furthermore, the opening threshold of the secondary pressure relief stop valve is 65%-68% of the initial pressure of the system.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1) In the present invention, a medium flow channel is provided in the integrated mounting block by a step-by-step pressure relief method, and the pressure transmitter, the pressure relief stop valve group and the overflow valve are connected through the integrated mounting block. During pressure relief, the system pressure is gradually and quickly relieved to zero by a two-stage pressure relief method. The pressure relief time is short. Under the premise of not significantly increasing the pressure relief time, the pressure of the hydraulic system is quickly and safely relieved to zero, thereby preventing the safe operation of the aircraft hydraulic system from being affected.

[0014] 2) In the present invention, a reasonable layout is adopted to reduce the number of pipeline connection points, reduce the risk of pipeline leakage, and improve the reliability and stability of aviation ground support equipment during long-term pressure maintenance, hydraulic sealing test and hydraulic strength test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a structural schematic diagram of the stepped pressure relief device of the hydraulic system of aviation ground support equipment of the present invention.

[0017] Figure 2 It is a schematic diagram of the integrated installation block structure in the present invention.

[0018] Figure 3 It is a schematic diagram of the internal medium flow channel of the integrated mounting block in the present invention.

[0019] Among them: 1-integrated mounting block, 11-oil supply port, 12-oil return port, 13-first oil inlet hole, 14-first oil return hole, 15-second oil inlet hole, 16-second oil return hole, 17-third oil inlet hole, 18-third oil return hole, 2-pressure transmitter, 3-first pressure relief stop valve, 4-secondary pressure relief stop valve, 5-overflow valve. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0021] Embodiment 1: Aviation ground support equipment hydraulic system step pressure relief device, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes a pressure transmitter 2, a pressure relief stop valve group and a relief valve 5. The integrated mounting block 1 is a rectangular structure, and a plurality of medium flow channels are processed inside the integrated mounting block 1; the pressure transmitter 2 is arranged on one side of the integrated mounting block 1 and is threadedly connected to the integrated mounting block 1, the pressure relief stop valve group is arranged at the upper and lower ends of the integrated mounting block 1, the relief valve 5 is arranged on the adjacent side of the pressure transmitter 2 and is located between the pressure relief stop valve group, and the integrated mounting block 1 is used to connect the pressure transmitter 2, the pressure relief stop valve group and the relief valve 5; an oil supply port 11 and an oil return port 12 are arranged on the integrated mounting block 1, the oil supply port 11 is arranged on the same side as the pressure transmitter 2, the through hole for installing the pressure transmitter in the integrated mounting block 1 is arranged side by side with the oil supply port 11 and is connected internally, and the oil return port 12 is arranged on the opposite side of the oil supply port 11; the pressure relief stop valve group includes a first-stage pressure relief stop valve 3 and a secondary pressure relief stop valve 4, the primary pressure relief stop valve 3 and the secondary pressure relief stop valve 4 are arranged relatively on the integrated mounting block 1; a first oil inlet hole 13 and a first oil return hole 14 are arranged at the position of the primary pressure relief stop valve 3 on the integrated mounting block 1, and a second oil inlet hole 15 and a second oil return hole 16 are arranged at the position of the secondary pressure relief stop valve 4 on the integrated mounting block 1; the first oil inlet hole 13 and the second oil inlet hole 15 are both connected with the oil supply port 11 inside the integrated mounting block 1; the first oil return hole 14 is connected with the relief valve 5, and the relief valve 5 is connected with the oil return port 12; the second oil return hole 16 is connected with the oil return port 12; a third oil inlet hole 17 and a third oil return hole 18 are arranged at the position of the relief valve 5 on the integrated mounting block 1, the third oil inlet hole 17 is connected with the first oil return hole 14, and the third oil return hole 18 is connected with the oil return port 12.

[0022] The hydraulic system is connected to the oil supply port 11 of the integrated mounting block 1 through a pipeline, and the oil return port 12 of the integrated mounting block 1 is connected to the oil tank through a pipeline. The hydraulic oil of the hydraulic system enters the primary pressure relief stop valve 3 and the pressure transmitter 2 from the oil supply port 11. When the pressure of the hydraulic system reaches the overpressure alarm value, the primary pressure relief stop valve 3 is opened, and the relief valve 5 is opened after the pressure generated by the hydraulic oil passing through the primary pressure relief stop valve 3; the relief valve 5 is a mechanical pressure regulating valve, and the pressure relief pressure can be adjusted to 0~35MPa through the pressure regulating knob. The setting value of the relief valve 5 is 50%~62.5% of the initial pressure of the system. Therefore, by adjusting the overflow pressure relief pressure, the pressure relief requirements of all military and civil aircraft hydraulic systems with an existing system pressure of 0~6000psi can be met; when the system pressure decreases, and the pressure transmitter 2 determines that it reaches the opening threshold of the secondary pressure relief stop valve 4, the secondary pressure relief stop valve 4 is opened to form a rapid graded pressure relief to avoid the hydraulic system filter element from being crushed under the action of the reverse impact force, causing pollution to the aircraft hydraulic system.

[0023] Embodiment 2: The stepped pressure relief system of the hydraulic system of aviation ground support equipment comprises an integrated installation unit, a pressure detection unit, a pressure relief unit and an overflow pressure relief unit, wherein the pressure detection unit, the pressure relief unit and the overflow pressure relief unit are respectively connected to the integrated installation unit, and the integrated installation unit interconnects the pressure detection unit, the pressure relief unit and the overflow pressure relief unit; the pressure detection unit is used to detect the oil inlet pressure of the hydraulic system, the pressure relief unit is used for graded pressure relief, and the overflow pressure relief unit cooperates with the pressure relief unit for overpressure overflow; the pressure relief unit comprises a primary pressure relief element and a secondary pressure relief element, and the primary pressure relief element and the secondary pressure relief element are arranged relatively on the integrated installation unit; the pressure detection unit is used to detect the oil inlet pressure of the hydraulic system, the pressure relief unit is used for graded pressure relief, and the overflow pressure relief unit cooperates with the pressure relief unit for overpressure overflow; the pressure relief unit comprises a primary pressure relief element and a secondary pressure relief element, and the primary pressure relief element and the secondary pressure relief element are arranged relatively on the integrated installation unit; The unit, pressure relief unit and overflow pressure relief unit are all connected to the external controller. The pressure detection unit can detect the initial pressure value of the hydraulic system. When the initial pressure value is higher than the overpressure alarm value, the pressure detection unit sends monitoring data to the controller. After receiving the detection data, the external controller sends an opening command to the first-level pressure relief unit. The hydraulic oil passes through the overflow pressure relief unit after passing through the first-level pressure relief unit. When the hydraulic oil pressure is greater than the opening threshold of the overflow pressure relief unit, the overflow pressure relief unit opens for overflow pressure relief; when the hydraulic system pressure drops to the opening threshold of the second-level pressure relief unit, the controller sends an opening command to the second-level pressure relief unit, and the second-level pressure relief unit starts to relieve pressure.

[0024] Embodiment 3: The step pressure relief method of the hydraulic system of aviation ground support equipment is to relieve the pressure of the hydraulic system through the step pressure relief device of the hydraulic system of aviation ground support equipment, and comprises the following steps: S1: Connect the oil supply port 11 and the oil return port 12 of the pressure relief device to the hydraulic system to be relieved and the equipment oil tank respectively, and connect the pressure relief device to the external control system; S2: Setting the overpressure alarm value of the pressure transmitter 2 and the opening threshold of the secondary pressure relief stop valve 4; S3: Setting the opening threshold of the overflow valve 5; S4: When the system pressure exceeds the pressure alarm value, the first-level pressure relief stop valve 3 is opened to release the pressure. When the pressure reaches the opening threshold of the second-level pressure relief stop valve 4, the second-level pressure relief valve is opened to release the pressure quickly.

[0025] The overpressure alarm value of the pressure transmitter 2 is 115% of the system initial pressure; the opening threshold of the relief valve 5 is 50%-62.5% of the system initial pressure; the opening threshold of the secondary pressure relief stop valve 4 is 65% of the system initial pressure.

[0026] When the initial pressure of the protected hydraulic system rises to the overpressure alarm value, the first-level pressure relief stop valve 3 is opened, and the hydraulic oil enters the overflow valve 5 through the first-level pressure relief stop valve 3. At this time, the pressure of the hydraulic system is also higher than the overflow pressure of the overflow valve 5. Therefore, the hydraulic system overflows the overflow valve 5 to introduce part of the oil into the oil tank, thereby reducing the pressure of the hydraulic system; when the pressure of the hydraulic system drops to 65% of the initial pressure of the system, it reaches the opening threshold of the second-level pressure relief stop valve 4 set by the pressure transmitter 2. At this time, the pressure transmitter 2 sends a data signal to the external control system, and the external control system delays opening the second-level pressure relief stop valve 4 after receiving the signal, and the system pressure is reduced to 0; the above method is used to achieve the step pressure relief of first reducing the pressure of the hydraulic system to 65% of the system pressure and then unloading from 65% to 0; in the case of high pressure, unloading the system pressure to 0 at one time will cause oil reflux due to the rapid flow of oil under a huge pressure difference, so that the oil supply filter in the aircraft hydraulic system is subjected to reverse hydraulic force during the oil reflux process, causing the filter element to collapse, which will seriously pollute the aircraft hydraulic system.

[0027] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship commonly placed when the product of the invention is used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In addition, if the terms "horizontal" or "vertical" appear in the description of the present invention, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A stepped pressure relief device for the hydraulic system of aviation ground support equipment, characterized in that: It includes an integrated mounting block, a pressure transmitter, a pressure relief stop valve group and a relief valve. The integrated mounting block is a rectangular structure. The pressure transmitter is arranged on one side of the integrated mounting block, the pressure relief stop valve group is arranged at the upper and lower ends of the integrated mounting block, and the relief valve is arranged on the adjacent side of the pressure transmitter. The integrated mounting block is used to connect the pressure transmitter, the pressure relief stop valve group and the relief valve; an oil supply port and an oil return port are arranged on the integrated mounting block. The oil supply port is arranged on the same side as the pressure transmitter, and the oil return port is arranged on the opposite side of the oil supply port.

2. The stepped pressure relief device for the hydraulic system of aviation ground support equipment according to claim 1, characterized in that: The pressure relief stop valve group includes a first-level pressure relief stop valve and a second-level pressure relief stop valve, which are arranged relatively to each other on the integrated mounting block; a first oil inlet hole and a first oil return hole are arranged at the position of the first-level pressure relief stop valve, and a second oil inlet hole and a second oil return hole are arranged at the position of the second-level pressure relief stop valve; the first oil inlet hole and the second oil inlet hole are both connected to the oil supply port; the first oil return hole is connected to the overflow valve, and the overflow valve is connected to the oil return port; the second oil return hole is connected to the oil return port.

3. The stepped pressure relief device for the hydraulic system of aviation ground support equipment according to claim 2, characterized in that: A third oil inlet hole and a third oil return hole are arranged on the integrated mounting block at the position of the overflow valve. The third oil inlet hole is communicated with the first oil return hole, and the third oil return hole is communicated with the oil return port.

4. The hydraulic system step pressure relief system of aviation ground support equipment is characterized by: It includes an integrated installation unit, a pressure detection unit, a pressure relief unit and an overflow pressure relief unit, wherein the pressure detection unit, the pressure relief unit and the overflow pressure relief unit are respectively connected to the integrated installation unit, and the integrated installation unit enables the pressure detection unit, the pressure relief unit and the overflow pressure relief unit to communicate with each other; the pressure detection unit is used to detect the oil inlet pressure of the hydraulic system, the pressure relief unit is used for graded pressure relief, and the overflow pressure relief unit cooperates with the pressure relief unit for overpressure overflow.

5. The hydraulic system step pressure relief system for aviation ground support equipment according to claim 4, characterized in that: The pressure relief unit comprises a primary pressure relief element and a secondary pressure relief element, and the primary pressure relief element and the secondary pressure relief element are arranged opposite to each other on the integrated installation unit.

6. A step-by-step pressure relief method for a hydraulic system of aviation ground support equipment, characterized in that: Relieving pressure on the hydraulic system by the hydraulic system step pressure relief device of aviation ground support equipment according to any one of claims 1 to 3 comprises the following steps: S1: Connect the oil supply port and oil return port of the pressure relief device to the pressure relief system and the equipment tank respectively, and connect the pressure relief device to the external control system; S2: Set the overpressure alarm value of the pressure transmitter and the opening threshold of the secondary pressure relief stop valve; S3: Set the opening threshold of the overflow valve; S4: When the system pressure exceeds the pressure alarm value, the first-level pressure relief stop valve is opened to release the pressure. When the pressure reaches the opening threshold of the second-level pressure relief stop valve, the second-level pressure relief valve is opened to release the pressure quickly.

7. The step-by-step pressure relief method for the hydraulic system of aviation ground support equipment according to claim 6, characterized in that: The overpressure alarm value of the pressure transmitter is 110%-115% of the initial pressure of the system.

8. The step-by-step pressure relief method for the hydraulic system of aviation ground support equipment according to claim 6, characterized in that: The opening threshold of the relief valve is 50%-62.5% of the initial pressure of the system.

9. The step-by-step pressure relief method for the hydraulic system of aviation ground support equipment according to claim 6, characterized in that: The opening threshold of the secondary pressure relief stop valve is 65%-68% of the initial system pressure.

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