Self-operated multifunctional composite valve for aviation ground support equipment

Abstract

This utility model discloses a self-operated multi-functional composite valve for aviation ground support equipment. The valve body has an upper chamber and a lower chamber. The upper chamber contains an overflow assembly and an upper valve core assembly, while the lower chamber contains a lower valve core assembly and a venting guide assembly. The venting guide assembly in the lower chamber allows gas or liquid to enter the lower chamber of the valve body and limits the lower valve core assembly, enabling it to slide up and down along the insertion hole of the venting guide seat in the venting guide assembly. The overflow assembly in the upper chamber allows for air intake, exhaust, and liquid drainage. The upper valve core assembly is inserted into and slides up and down within the limiting hole of the overflow seat in the overflow assembly. A spring is fitted on the upper valve core of the upper valve core assembly. When the upper valve core is not subjected to external hydraulic pressure, its bottom abutment part abuts against the bottom of the upper chamber, and its central hole is used for ventilation. The lower valve core assembly rises under the buoyancy of the liquid, sealing the valve body. Increased oil pressure on the upper valve core allows overflow through the overflow seat.

Description

Technical Field

[0001] The utility model belongs to the technical field of aviation ground support equipment, and specifically relates to a self-operated multi-function composite valve for aviation ground support equipment. Background Art

[0002] In consideration of maintenance convenience and economy, the liquid tank of ground support equipment is usually an open type liquid tank, which is communicated with the atmosphere. Ventilation is required during normal operation of the equipment to ensure the oil suction environment of the oil pump. The positions of the hydraulic system, liquid cooling system, lubricating oil system and fuel system of modern heavy fighter aircraft are higher than those of the liquid tank and pipelines of ground support equipment. When the ground support equipment is docked with the liquid supply and return ports of the aircraft and not yet debugged, the oil in the aircraft hydraulic system will naturally flow back to the equipment liquid tank, causing the liquid level of the liquid tank to increase. When the liquid level reaches the high liquid level limit, it is necessary to close the air outlet to prevent oil overflow.

[0003] When the ground support equipment is tested jointly with the aircraft, if the valve of the aircraft hydraulic system operates incorrectly, it may cause oil to channel from the aircraft hydraulic system into the liquid tank of the ground support equipment, resulting in an increase of the liquid level in the liquid tank of the ground support equipment. After the liquid tank is filled with oil, the internal pressure of the liquid tank will rise. The liquid tank of the ground support equipment is a normal pressure liquid tank, and its pressure resistance is generally low. When the liquid tank pressure exceeds 0.345 MPa, there is a risk of rupture or deformation of the liquid tank.

[0004] Existing protection devices for liquid tanks usually use a linkage control of a liquid level sensor and an electric stop valve or a manual stop valve to manually control the ventilation and self-sealing of the liquid tank with the atmosphere, and need to use a linkage control of a pressure sensor and an electric stop valve or a mechanical overflow valve for high-pressure overflow. The manual stop valve requires manual opening or closing according to the process steps of the equipment, and it often happens that the operator fails to open or close the manual stop valve in time, resulting in serious consequences such as the liquid tank and the connecting pipelines of the liquid tank being sucked flat or the pipeline bursting caused by the internal pressure not being discharged in time. The electric stop valve needs to be linked with liquid level and pressure sensors, which requires a large number of valves and sensors, has complex control logic, and when the ground support equipment is connected to the aircraft, the complex electromagnetic environment on the aircraft may cause misoperation of the valve and affect the protection effect of the liquid tank.

[0005] The main function of the existing float valve is to discharge the gas at the inlet, with the gas flowing from the valve inlet to the valve outlet. The ventilation function of the liquid tank of aviation ground equipment is mainly used to introduce ambient air, so as to ensure that the internal air pressure of the liquid tank is consistent with the ambient air pressure when the support equipment is working, and the gas flows from the valve outlet to the valve inlet. In addition, the existing float valve is provided with a buffer cavity, a sealing gasket, a floating valve core, a pressure pad, a housing and other components, which has a large number of parts, complex structure and poor reliability, and cannot be applied to the ventilation of oil tanks. In addition, although the existing mechanical overflow valve has a mature structure, it has a single function and cannot concurrently have the ventilation function.

[0006] To address the above issues, it is necessary to develop a self-operated multi-functional composite valve for aviation ground support equipment that can solve these problems. Utility Model Content

[0007] The purpose of this utility model is to provide a self-operated multi-functional composite valve for aviation ground support equipment. It can automatically perform functions such as venting, self-sealing, and pressure relief according to the liquid level inside the liquid tank. The valve has a high degree of integration. The valve as a whole is a self-operated integrated pure mechanical structure. It does not require sensors to feed back the pressure and liquid level in the liquid tank, nor does it require a controller to control the valve component's movement or the real-time operation status of the equipment. It also does not require electrical control. A single valve can complete the self-adaptation and self-adjustment of the three states of the liquid tank. It has a high degree of integration and good reliability.

[0008] This utility model is achieved through the following technical solution: A self-operated multi-functional composite valve for aviation ground support equipment includes a valve body mechanism, a lower valve core assembly, and an upper valve core assembly. The bottom of the valve body mechanism is connected to the equipment's liquid tank. Both the lower and upper valve core assemblies are disposed within the valve body mechanism and are movably connected to it. The bottom of the lower valve core assembly extends into the equipment's liquid tank. The valve body mechanism, in conjunction with the upper and lower valve core assemblies, enables the composite valve to achieve venting, self-sealing, and overflow states. Ventilation state: The upper valve core assembly and the lower valve core assembly are spaced apart, and the gas flows freely through the upper valve core assembly in the valve body mechanism; Self-sealing state: The bottom of the lower valve core assembly is buoyed by the liquid in the equipment tank and comes into contact with the upper valve core assembly, blocking the upper valve core assembly and keeping the valve body mechanism in a sealed state; Overflow state: When the self-sealing composite valve is in a self-sealing state, liquid continues to be added to the equipment liquid tank. The liquid enters the valve body mechanism and squeezes the upper valve core assembly, causing both the upper and lower valve core assemblies to rise, thus releasing the sealing state of the valve body mechanism and allowing the liquid to overflow and release pressure.

[0009] Preferably, the valve body mechanism includes a first flange, a second flange, a valve body, a venting guide assembly, and an overflow assembly. The valve body is disposed between the first flange and the second flange, which fix the valve body. Both the venting guide assembly and the overflow assembly are disposed within the valve body. The venting guide assembly is disposed at the bottom of the valve body, and the lower valve core assembly is inserted into and slidably connected to the venting guide assembly. The venting guide assembly is used to vent the valve body and limit the movement of the lower valve core assembly. The overflow assembly is disposed at the top of the valve body, and the upper valve core assembly is inserted into and connected to the overflow assembly. The overflow assembly limits the movement of the upper valve core assembly and is used for liquid overflow.

[0010] Preferably, the valve body is provided with an upper chamber and a lower chamber, the overflow assembly and the upper valve core assembly are both disposed in the upper chamber, the venting guide assembly is disposed in the lower chamber, and the diameter of the upper chamber is larger than the diameter of the lower chamber.

[0011] Preferably, the venting guide assembly includes a venting guide seat and a first elastic retaining ring. The venting guide seat is disposed in the lower chamber and is axially limited by the side wall of the lower chamber. A first annular groove is provided on the side wall of the lower chamber below the venting guide seat. The first elastic retaining ring is disposed in the first annular groove and axially limits the venting guide seat. An insertion hole is provided in the middle of the venting guide seat, and the lower valve core assembly is inserted into the insertion hole of the venting guide seat. Ventilation holes are provided around the insertion hole on the venting guide seat.

[0012] Preferably, the lower valve core assembly includes a float, a connecting rod, and a lower valve core. The connecting rod passes through the vent guide seat and is threaded to the float and the lower valve core at both ends, respectively. The lower valve core is located in the lower chamber of the valve body, the float is located outside the valve body, and the top of the lower valve core abuts against the bottom of the upper valve core assembly.

[0013] Preferably, anti-loosening nuts are provided on the connecting rod at the positions of the float and the lower valve core.

[0014] Preferably, the overflow assembly includes an overflow seat and a second elastic retaining ring. The overflow seat is disposed in the upper chamber and is axially limited by the side wall of the upper chamber. A second annular groove is provided on the side wall of the upper chamber above the overflow seat. The second elastic retaining ring is disposed in the second annular groove and axially limits the overflow seat. A limiting hole is provided in the middle of the overflow seat, and the upper valve core assembly is inserted into the limiting hole of the overflow seat. An overflow hole is provided on the overflow seat around the guide hole.

[0015] Preferably, the upper valve core assembly includes an upper valve core and a spring. The upper valve core includes an abutment portion and a sliding portion. The sliding portion is inserted into and slidably connected to the limiting hole of the overflow seat. The abutment portion abuts against the bottom of the upper chamber of the valve body. The diameter of the abutment portion is larger than the diameter of the sliding portion and the lower chamber of the valve body. The upper valve core is provided with a central hole that passes through the abutment portion and the sliding portion. The diameter of the lower valve core is larger than the diameter of the central hole. The top of the lower valve core abuts against the abutment portion of the upper valve core to seal the valve body. The spring is sleeved on the sliding portion, and both ends of the spring abut against the abutment portion and the overflow seat, respectively.

[0016] Preferably, the lower valve core has a first limiting groove on its edge, and a first O-ring is provided in the first limiting groove, which abuts against the upper valve core.

[0017] Preferably, a second limiting groove is provided at the bottom of the upper chamber of the valve body, and a second O-ring is provided in the second limiting groove, and the abutting part of the upper valve core abuts against the second O-ring.

[0018] Compared with the prior art, this utility model has the following advantages and beneficial effects: 1) In this utility model, the device can automatically perform functions such as venting, self-sealing, and pressure relief according to the liquid level inside the equipment tank, providing reliable safety protection for the equipment tank. The valve has a high degree of integration, and the valve as a whole is a self-operated integrated pure mechanical structure. It does not require sensors to feed back the pressure and liquid level in the tank, nor does it require a controller to control the valve components or the real-time operation of the equipment. It also does not require electrical control. One valve can complete the self-adaptation and self-adjustment of the three states of the tank. It has a high degree of integration and good reliability.

[0019] 2) In this utility model, an upper chamber and a lower chamber are provided in the valve body. An overflow assembly and an upper valve core assembly are provided in the upper chamber, and a lower valve core assembly and a venting guide assembly are provided in the lower chamber. The venting guide assembly in the lower chamber allows gas or liquid to enter the lower chamber of the valve body and limits the lower valve core assembly, allowing it to slide up and down along the insertion hole in the center of the venting guide seat in the venting guide assembly. The overflow assembly in the upper chamber allows for air intake, air exhaust, and liquid drainage. The upper valve core assembly is inserted and fitted with the limiting hole in the overflow seat of the overflow assembly and is limited in position. The valve core slides up and down in the hole. The upper valve core of the upper valve core assembly is fitted with a spring. When the upper valve core is not subjected to external hydraulic pressure, its bottom abutting part abuts against the bottom of the upper chamber. Its central hole is used for ventilation. When the lower valve core assembly rises under the influence of liquid buoyancy and abuts against the bottom of the upper valve core, the central hole is blocked, so that the valve body is in a sealed state. When the oil in the equipment liquid tank continues to increase and the pressure increases, the oil will squeeze and push open the upper valve core. The oil enters the upper chamber of the valve body and is discharged through the overflow hole of the overflow seat, so that the valve body has multiple functions such as ventilation, self-sealing and overflow.

[0020] 3) In this utility model, the float, connecting rod and lower valve core of the lower valve core assembly are all made of metal. The middle part of the float is hollow and its own weight is relatively large. When most of the volume of the float is immersed in the liquid, the buoyancy of the liquid can lift the float and the lower valve core, so that they abut against the bottom of the upper valve core. However, due to the action of the spring on the upper valve core, the buoyancy of the liquid on the float alone cannot lift the upper valve core. Therefore, continuous sealing can be achieved in the valve body. If the liquid continues to rise and enters the lower chamber of the valve body, the liquid will squeeze the upper valve core and lift it up, so as to achieve the purpose of depressurizing the equipment liquid tank. The composite valve is a purely mechanical design that does not consume energy. The self-sealing time of the valve body can be controlled by adjusting the size or height of the float, and the overflow pressure parameter of the equipment liquid tank can be controlled by adjusting the elastic coefficient of the spring.

[0021] 4) In this utility model, the valve components are connected by threads or snap rings, which makes disassembly convenient. The valve can be repaired using common snap ring pliers and wrenches. The average repair time (MTTR) is ≤20 minutes, which enables the valve to be repaired quickly after a failure, reducing downtime and impact. Under the premise of meeting functional requirements, the valve has simplified components, minimized the types and number of parts, improved product reliability, and reduced product manufacturing costs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the multifunctional composite valve in this utility model.

[0024] Figure 2 This is a top view of the multifunctional composite valve in this utility model.

[0025] Figure 3 for Figure 2 A cross-sectional view of the structure along the AA direction.

[0026] Figure 4 This is a schematic diagram of the valve body in this utility model.

[0027] Figure 5 This is a schematic diagram of the assembly structure of the lower valve core assembly and the vent guide seat in this utility model.

[0028] Figure 6 This is a schematic diagram of the assembly structure of the overflow seat and the upper valve core assembly in this utility model.

[0029] Wherein: 1-valve body, 11-upper chamber, 111-second annular groove, 112-second limiting groove, 113-second O-ring, 12-lower chamber, 121-first annular groove, 2-lower valve core assembly, 21-float, 22-connecting rod, 23-lower valve core, 231-first limiting groove, 232-first O-ring, 24-anti-loosening nut, 3-upper valve core assembly, 31-upper valve core, 311-center hole, 32-spring, 4-overflow assembly, 41-overflow seat, 411-overflow hole, 42-second elastic retaining ring, 5-venting guide assembly, 51-venting guide seat, 511-venting hole, 52-first elastic retaining ring, 6-first flange, 7-second flange. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0031] Example 1: A self-operated multi-functional composite valve for aviation ground support equipment, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the device includes a valve body mechanism, a lower valve core assembly 2, and an upper valve core assembly 3. The bottom of the valve body mechanism is connected to the equipment's liquid tank. Both the lower valve core assembly 2 and the upper valve core assembly 3 are located within the valve body mechanism and are movably connected to it. The valve body mechanism, the lower valve core assembly 2, and the upper valve core assembly 3 are all made of 304 stainless steel, which has strong corrosion resistance. The valve body mechanism includes a first flange 6, a second flange 7, a valve body 1, a venting guide assembly 5, and an overflow assembly 4. The valve body 1 has an upper chamber 11 and a lower chamber 12. The overflow assembly 4 and the upper valve core assembly 3 are both located in the upper chamber 11, and the venting guide assembly 5 is located in the lower chamber 12. Both the upper chamber 11 and the lower chamber 12 are cylindrical cavity structures, with the diameter of the upper chamber 11 being larger than the diameter of the lower chamber 12. The valve body 1 is positioned between the first flange 6 and the second flange 7. The first flange 6 and the second flange 7 fix the valve body 1. The second flange 7 is positioned below the first flange 6 and is connected to the equipment liquid tank. The first flange 6 is connected to the external liquid storage tank.

[0032] The upper valve core assembly 3 abuts against the bottom of the upper chamber 11, allowing gas to pass through and realizing the venting function of the composite valve. The bottom of the lower valve core assembly 2 protrudes from the bottom of the valve body 1. The venting guide assembly 5 limits the lower valve core assembly 2, and the bottom of the lower valve core assembly 2 extends into the equipment liquid tank. The bottom of the lower valve core assembly 2 rises under the buoyancy of the liquid in the equipment liquid tank and abuts against the bottom of the upper valve core assembly 3, blocking the gas passage of the upper valve core assembly 3 and keeping the valve body mechanism in a sealed state, realizing the self-sealing function of the composite valve. As the liquid in the equipment liquid tank increases, the liquid enters the valve body mechanism and squeezes the upper valve core assembly 3, causing the upper valve core assembly 3 to move upward, releasing the sealing state of the valve body mechanism and allowing the liquid to overflow and release pressure, realizing the pressure relief function of the composite valve.

[0033] Both the venting guide assembly 5 and the overflow assembly 4 are located inside the valve body 1. The venting guide assembly 5 is located in the lower chamber 12 of the valve body 1. The lower valve core assembly 2 is inserted into and slidably connected to the venting guide assembly 5. The venting guide assembly 5 limits the lower valve core assembly 2 so that it cannot shift left or right. The venting guide assembly 5 is used for venting the valve body 1. The overflow assembly 4 is located in the upper chamber 11 of the valve body 1. The upper valve core assembly 3 is inserted into and connected to the overflow assembly 4. The overflow assembly 4 limits the upper valve core assembly 3 to prevent it from shifting left or right during movement. When liquid enters the upper chamber 11 of the valve body 1, the liquid can overflow and be discharged through the overflow assembly 4.

[0034] Example 2: This embodiment, based on the above embodiment, further defines the venting guide assembly 5 and the lower valve core assembly 2, such as... Figure 1 , Figure 3 and Figure 5 As shown, the venting guide assembly 5 includes a venting guide seat 51 and a first elastic retaining ring 52. The venting guide seat 51 is disposed in the lower chamber 12 and is axially limited by the side wall of the lower chamber 12. The side wall of the lower chamber 12 has a stepped annular groove structure for installing the venting guide seat 51 and limiting the venting guide seat 51. A first annular groove 121 is provided on the side wall of the lower chamber 12 below the venting guide seat 51. The first elastic retaining ring 52 is disposed in the first annular groove 121 and axially limits the venting guide seat 51 to prevent the venting guide seat 51 from falling off the valve body 1. An insertion hole is provided in the middle of the venting guide seat 51, and the lower valve core assembly 2 is inserted into the insertion hole of the venting guide seat 51. Vent holes 511 are provided around the insertion hole on the venting guide seat 51. The vent holes 511 have a fan-shaped structure, and liquid can enter the valve body 1 through the vent holes 511.

[0035] The lower valve core assembly 2 includes a float 21, a connecting rod 22, and a lower valve core 23. The float 21 has a cylindrical structure with semi-circular ends. The two ends of the connecting rod 22 are threaded to the ends of the float 21 and the lower valve core 23, respectively. The middle part of the connecting rod 22 passes through the insertion hole of the vent guide seat 51. The lower valve core 23 is located in the lower chamber 12 of the valve body 1 and between the vent guide seat 51 and the upper valve core assembly 3. The float 21 is located outside the valve body 1. When the float 21 is lifted by the buoyancy of the liquid, the top of the lower valve core 23 abuts against the bottom of the upper valve core assembly 3, blocking the gas passage of the upper valve core assembly 3 and sealing the valve body 1. Anti-loosening nuts 24 are provided on the connecting rod 22 at the positions of the float 21 and the lower valve core 23 to prevent the float 21 and the lower valve core 23 from loosening and falling off. Other parts of this embodiment are the same as those in the above embodiment and will not be described again here.

[0036] Example 3: This embodiment, based on the above embodiment, further defines the overflow assembly 4 and the upper valve core assembly 3, such as... Figure 1 , Figure 3 and Figure 6 As shown, the overflow assembly 4 includes an overflow seat 41 and a second elastic retaining ring 42. The overflow seat 41 has a disc-shaped structure and is disposed in the upper chamber 11. The upper chamber 11 has a stepped structure for installing the overflow seat 41 and axially limiting it. A second annular groove 111 is provided on the side wall of the upper chamber 11 above the overflow seat 41. The second elastic retaining ring 42 is disposed in the second annular groove 111 and axially limits the overflow seat 41 to prevent the overflow seat 41 from coming off the valve body 1. A limiting hole is provided in the middle of the overflow seat 41, and the upper valve core assembly 3 is inserted into the limiting hole of the overflow seat 41. Multiple circular overflow holes 411 are provided on the overflow seat 41 around the guide hole for draining and overflowing.

[0037] The upper valve core assembly 3 includes an upper valve core 31 and a spring 32. The upper valve core 31 includes an abutting part and a sliding part. The sliding part is inserted into and slidably connected to the limiting hole of the overflow seat 41. The abutting part abuts against the bottom of the upper chamber 11 of the valve body 1. The diameter of the abutting part is larger than the diameter of the sliding part and the lower chamber 12 of the valve body 1. The upper valve core 31 is provided with a central hole 311, which is the gas passage. When the upper valve core 31 abuts against the bottom of the upper chamber 11 of the valve body 1, the spring 32 is in the middle position. The central hole 311 is used for ventilation. The central hole 311 is set through the abutment part and the sliding part. The spring 32 is sleeved on the sliding part. The two ends of the spring 32 abut against the abutment part and the overflow seat 41 respectively. Under the action of the spring 32, the upper valve core 31 abuts against the bottom of the upper chamber 11 of the valve body 1. The diameter of the top of the lower valve core 23 is larger than the diameter of the central hole 311. The top of the lower valve core 23 abuts against the abutment part of the upper valve core 31, blocking the central hole 311, thereby closing the valve body 1. The lower valve core 23 has a first limiting groove 231 on its edge, and a first O-ring 232 is provided in the first limiting groove 231. The first O-ring 232 abuts against the abutting part of the upper valve core 31. The bottom of the upper chamber 11 of the valve body 1 has a second limiting groove 112, and a second O-ring 113 is provided in the second limiting groove 112. The abutting part of the upper valve core 31 abuts against the second O-ring 113. The first limiting groove 231 and the second limiting groove 112 are both dovetail groove structures that are narrow at the top and wide at the bottom to prevent the first O-ring 232 and the second O-ring 113 from falling off.

[0038] When the liquid in the equipment tank is low, the float 21 of the lower valve core assembly 2 is not affected by buoyancy. Therefore, under the action of gravity, the lower valve core 23 cannot contact the bottom of the upper valve core 31. Thus, gas enters the valve body 1 through the vent hole 511 of the vent guide seat 51 and exits through the central hole 311 of the upper valve core 31, or enters the valve body 1 through the central hole 311 of the upper valve core 31 and enters the equipment tank through the vent hole 511 of the vent guide seat 51, thus achieving the function of venting the equipment tank. As the liquid rises, the liquid generates buoyancy on the float 21. As the area of ​​the float 21 immersed in the liquid increases, the float 21 will drive the lower valve core 23 to rise, eventually causing the lower valve core 23 to abut against the contact part of the upper valve core 31, sealing the central hole 311 of the upper valve core 31, and making the valve body 1 in a sealed state. The float 21, connecting rod 22, and lower valve core 23 are all made of 304 stainless steel. The stainless steel material is relatively heavy. Under the elastic action of the spring 32 on the upper valve core 31, the buoyancy of the float 21 cannot lift the upper valve core 31. Therefore, when the liquid in the equipment tank does not compress the upper valve core 31, the tank is in a relatively sealed state. As the liquid increases, the liquid enters the lower chamber 12 of the valve body 1, compressing the upper valve core 31. The upper valve core 31 moves upward, and the liquid enters the upper chamber 11 of the valve body 1, eventually flowing out through the overflow hole 411 of the overflow seat 41 to protect the equipment tank. As the liquid overflows, when the liquid in the tank no longer increases, the upper valve core 31 resets under the action of the spring 32 and gravity. The lower valve core 23 also descends and continues to abut against the bottom of the upper valve core 31 under the action of buoyancy. As the liquid in the equipment tank is gradually discharged, the upper valve core 31 also resets, and the valve body 1 returns to the venting state.

[0039] In the above embodiments, the insertion depth of the connecting rod 22 into the equipment liquid tank is typically within the range of 70mm to 160mm, ensuring that the rigidity of the connecting rod 22 meets the self-sealing requirements. Among the applicable liquids, the lowest density medium is YH-10 type aviation hydraulic oil, with a density of 0.832 g / cm³. 3 The medium with the highest density is 65# military aviation coolant, with a density of 1.023 g / cm³. 3 After the float is fully submerged in 65# military aviation coolant, the float 21 generates buoyancy. When the length of the connecting rod 22 is 70mm, the buoyancy generated by the float 21 is 12.48N, and when the length of the connecting rod 22 is 160mm, the buoyancy generated by the float 21 is 15.345N. The self-weight of the lower valve core 23, connecting rod 22, float 21, anti-loosening nut 24 and other parts is 5.2N~5.8N, the sliding friction is 0.3N, and the downward pressure of the spring 32 is 75N. After the float 21 is submerged in the medium, the downward pressure provided by the spring 32, the self-weight, and the friction can effectively resist the upward buoyancy of the float 21, so that the lower valve core 23 is suspended on the upper valve core 31, providing the compression force for the sealing of the first O-ring 232, ensuring reliable sealing during self-sealing.

[0040] The combined effective working area of ​​the upper and lower valve cores is 2374 mm². 2 When the pressure in the equipment's liquid tank exceeds 0.345 MPa, the hydraulic pressure exceeds the sum of the weight of the upper valve core assembly 3 and the lower valve core assembly 2, as well as the frictional force. Under the action of the hydraulic pressure, the upper valve core 31 is pushed open, initiating overflow and preventing overpressure in the equipment's liquid tank. Alternatively, springs 32 of different stiffness can be used to match the liquid tank protection pressure requirements of different models. Other parts of this embodiment are the same as those in the above embodiments and will not be repeated here.

[0041] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] Furthermore, the use of terms such as "horizontal" or "vertical" in the description of this utility model does not imply that the component is required to be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0043] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A self-operated multi-functional composite valve for aviation ground support equipment, characterized in that, The valve includes a valve body mechanism, a lower valve core assembly, and an upper valve core assembly. The bottom of the valve body mechanism is connected to the equipment's liquid tank. The lower and upper valve core assemblies are both housed within the valve body mechanism and are movably connected to it. The bottom of the lower valve core assembly extends into the equipment's liquid tank. The valve body mechanism, in conjunction with the upper and lower valve core assemblies, enables the composite valve to achieve venting, self-sealing, and overflow states. Ventilation state: The upper valve core assembly and the lower valve core assembly are spaced apart, and the gas flows freely through the upper valve core assembly in the valve body mechanism; Self-sealing state: The bottom of the lower valve core assembly is buoyed by the liquid in the equipment tank and comes into contact with the upper valve core assembly, blocking the upper valve core assembly and keeping the valve body mechanism in a sealed state; Overflow state: When the self-sealing composite valve is in a self-sealing state, liquid continues to be added to the equipment liquid tank. The liquid enters the valve body mechanism and squeezes the upper valve core assembly, causing both the upper and lower valve core assemblies to rise, thus releasing the sealing state of the valve body mechanism and allowing the liquid to overflow and release pressure.

2. The self-operated multifunctional composite valve for an aviation ground support equipment according to claim 1, characterized in that, The valve body mechanism includes a first flange, a second flange, a valve body, a venting guide assembly, and an overflow assembly. The valve body is disposed between the first flange and the second flange, which fix the valve body in place. Both the venting guide assembly and the overflow assembly are disposed within the valve body. The venting guide assembly is located at the bottom of the valve body, and the lower valve core assembly is inserted into and slidably connected to the venting guide assembly. The venting guide assembly is used to vent the valve body and limit the movement of the lower valve core assembly. The overflow assembly is located at the top of the valve body, and the upper valve core assembly is inserted into and connected to the overflow assembly. The overflow assembly limits the movement of the upper valve core assembly and is used for liquid overflow.

3. The self-operated multifunctional composite valve for an aviation ground support equipment according to claim 2, characterized in that, The valve body is provided with an upper chamber and a lower chamber. The overflow assembly and the upper valve core assembly are both located in the upper chamber, and the venting guide assembly is located in the lower chamber. The diameter of the upper chamber is larger than the diameter of the lower chamber.

4. The self-operated multifunctional composite valve for an aviation ground support equipment according to claim 3, characterized in that, The ventilation guide assembly includes a ventilation guide seat and a first elastic retaining ring. The ventilation guide seat is disposed in the lower chamber and is axially limited by the side wall of the lower chamber. A first annular groove is provided on the side wall of the lower chamber below the ventilation guide seat. The first elastic retaining ring is disposed in the first annular groove and axially limits the ventilation guide seat. An insertion hole is provided in the middle of the ventilation guide seat, and the lower valve core assembly is inserted into the insertion hole of the ventilation guide seat. Ventilation holes are provided around the insertion hole on the ventilation guide seat.

5. The self-operated multifunctional composite valve for an aviation ground support equipment according to claim 4, characterized in that, The lower valve core assembly includes a float, a connecting rod, and a lower valve core. The connecting rod passes through the vent guide seat and is threaded to the float and the lower valve core at both ends, respectively. The lower valve core is located in the lower chamber of the valve body, and the float is located outside the valve body. The top of the lower valve core abuts against the bottom of the upper valve core assembly.

6. The self-operated multifunctional composite valve for an aviation ground support equipment according to claim 5, characterized in that, Anti-loosening nuts are provided on the connecting rod at the positions of the float and the lower valve core.

7. The self-operated multi-functional composite valve for aviation ground support equipment as described in claim 5, characterized in that, The overflow assembly includes an overflow seat and a second elastic retaining ring. The overflow seat is disposed in the upper chamber and is axially limited by the side wall of the upper chamber. A second annular groove is provided on the side wall of the upper chamber above the overflow seat. The second elastic retaining ring is disposed in the second annular groove and axially limits the overflow seat. A limiting hole is provided in the middle of the overflow seat. The upper valve core assembly is inserted into the limiting hole of the overflow seat. An overflow hole is provided on the overflow seat around the guide hole.

8. The self-operated multi-functional composite valve for aviation ground support equipment as described in claim 7, characterized in that, The upper valve core assembly includes an upper valve core and a spring. The upper valve core includes an abutment portion and a sliding portion. The sliding portion is inserted into and slidably connected to the limiting hole of the overflow seat. The abutment portion abuts against the bottom of the upper chamber of the valve body. The diameter of the abutment portion is larger than the diameter of the sliding portion and the lower chamber of the valve body. The upper valve core is provided with a central hole that passes through the abutment portion and the sliding portion. The diameter of the lower valve core is larger than the diameter of the central hole. The top of the lower valve core abuts against the abutment portion of the upper valve core to seal the valve body. The spring is sleeved on the sliding portion, and both ends of the spring abut against the abutment portion and the overflow seat, respectively.

9. The self-operated multi-functional composite valve for aviation ground support equipment as described in claim 8, characterized in that, The lower valve core has a first limiting groove on its edge, and a first O-ring is provided in the first limiting groove. The first O-ring abuts against the abutting part of the upper valve core.

10. The self-operated multi-functional composite valve for aviation ground support equipment as described in claim 8, characterized in that, The bottom of the upper chamber of the valve body is provided with a second limiting groove, and a second O-ring is provided in the second limiting groove. The abutting part of the upper valve core abuts against the second O-ring.

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