A pressure retaining device

Abstract

The application discloses a pressure maintaining device, relates to the technical field of aircraft volume device and pipeline system design, and comprises a shell in a rotary body inner space structure and an end cover, the shell and the end cover are sealingly connected to form a device inner cavity, an air outlet valve capable of sliding in the axial direction and realizing air outlet on-off control is assembled in the device inner cavity, an air outlet valve spring provides sealing compression force and reset power for the air outlet valve, an air inlet valve capable of sliding in the axial direction and realizing air inlet on-off control is assembled in the inner cavity, and an air inlet valve spring provides sealing compression force and reset power for the air inlet valve. The application realizes self-adaptive regulation and control of pressure by relying on the mechanical linkage of the air inlet valve spring, the air outlet valve spring, the air inlet valve and the air outlet valve, does not need manual intervention in the whole process, has high automation degree, can automatically and accurately match the output and input of gas pressure and flow, has small error and high regulation and control precision, greatly improves work efficiency, and meets the high-precision control requirement.

Description

Technical Field

[0001] This invention relates to the field of aircraft volumetric devices and piping system design technology, specifically a pressure maintaining device. Background Technology

[0002] Aircraft volumetric devices and piping systems, when used on the ground and in the air, often require pressure maintenance due to changes in their internal media and operating conditions to meet normal operation requirements. Currently, to achieve this pressure maintenance, exhaust and intake devices are used separately to control gas output and input, thereby keeping the pressure within the design range.

[0003] Exhaust and intake devices are widely used and can solve the problem, but these devices are complex in structure, occupy a lot of space, have a low degree of automation, and low working efficiency. In particular, the pressure and flow matching accuracy is not high, making it difficult to meet the requirements of high-precision control. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide a pressure maintaining device to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pressure maintaining device for automatically controlling the pressure in the volumetric device and piping system of an aircraft and maintaining the pressure value within a set range, comprising a shell and an end cap having a rotating hollow structure, wherein the shell and the end cap are sealed together to form the inner cavity of the device;

[0006] The device is equipped with an axially sliding air outlet valve that controls the air outlet flow, an air outlet valve spring that provides sealing pressure and reset force for the air outlet valve, and a clamping nut that cooperates with the air outlet valve spring for positioning. The air outlet valve has an inner cavity in which an axially sliding air inlet valve that controls the air inlet flow, an air inlet valve spring that provides sealing pressure and reset force for the air inlet valve, and a bushing that cooperates with the air inlet valve spring for positioning.

[0007] One end of the vent valve spring is installed in the groove of the compression nut, and the other end is installed in the groove of the vent valve. The vent valve contacts the inner wall of the end cover and slides axially along it.

[0008] One end of the intake valve spring is installed in the groove of the bushing, and the other end is installed in the groove of the intake valve. The intake valve contacts the inner wall of the exhaust valve and the bushing and slides axially along them.

[0009] The end of the vent valve near the connecting thread of the housing is vulcanized with an annular rubber body to achieve vent sealing. The annular rubber body is used to press and fit with the stepped surface of the housing to form an vent sealing structure.

[0010] The end of the intake valve away from the housing's connecting thread is vulcanized with a conical rubber body to achieve an intake seal. The conical rubber body is used to press against the inner surface of the outlet valve to form an intake seal structure.

[0011] The end cap is equipped with a filter screen for filtering the outside air entering the device. The filter screen is fixedly installed at the air inlet end face inside the end cap and completely covers the air inlet. A sealing ring is provided at the connection between the housing and the end cap to achieve a seal.

[0012] The bushing is fixedly connected to the inner cavity of the vent valve by threads, and the clamping nut is fixedly connected to the inner cavity of the housing by threads, thereby achieving axial positioning of each component in the inner cavity of the device;

[0013] One end of the housing is provided with a connecting thread for connection to the aircraft's volume device or piping system, and the other end is adapted to be connected to an end cap. The end of the end cap away from the housing is provided as a connecting end for connection to the aircraft's outer skin.

[0014] The housing has an HB-external thread connector. The end of the housing away from the connecting thread has a standard internal thread. The end of the end cap connected to the housing is a standard external thread connector that is compatible with the standard internal thread. The end of the end cap is a circular flange. The air inlet communicating with the inner cavity of the end cap is opened in the middle of the flange.

[0015] The air outlet inside the connecting thread of the housing is connected to the inner cavity of the housing to enable gas flow between the device and the aircraft volume device or pipeline system.

[0016] The sealing ring is an elastic sealing element, which is embedded between the threaded connection mating surfaces of the housing and the end cover to achieve static sealing at the connection point between the two.

[0017] In summary, the present invention has the following main beneficial effects:

[0018] This invention achieves adaptive pressure control by relying on the mechanical linkage of the intake valve spring, the exhaust valve spring, the intake valve, and the exhaust valve. The entire process requires no manual intervention, has a high degree of automation, and can automatically and accurately match the output and input of gas pressure and flow. It has small errors, high control accuracy, and greatly improves work efficiency, meeting the requirements of high-precision control.

[0019] Meanwhile, a filter screen is installed inside the air intake to filter the incoming air, ensuring the cleanliness of the input gas. At the same time, the integrated structural design reduces the number of connecting parts and control nodes, improving the reliability of the device. It can stably maintain the pressure in the aircraft's volumetric device and piping system within the set range, adapting to its complex working conditions on the ground and in the air. Attached Figure Description

[0020] Figure 1 This is an exploded view of the entire invention;

[0021] Figure 2 This is a cross-sectional view of the entire invention;

[0022] Figure 3 This is a first-view structural diagram of the entire invention;

[0023] Figure 4 This is a second-view structural diagram of the entire invention.

[0024] In the diagram: 1. Housing; 2. End cap; 3. Bushing; 4. Compression nut; 5. Filter screen; 6. Inlet valve spring; 7. Outlet valve spring; 8. Inlet valve; 9. Outlet valve; 10. Sealing ring; 11. Inlet; 12. Outlet; 13. Annular rubber body; 14. Conical rubber body; 15. Connecting thread. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] The embodiments of the present invention will now be described.

[0027] Example 1

[0028] like Figure 1-4 As shown, this embodiment discloses a pressure maintaining device, which is applied in the field of aircraft volume device and pipeline system design technology. It can automatically regulate the internal pressure of the aircraft volume device and pipeline system to keep it stably within a set range. The specific structure and assembly method of the device are described in detail below. This embodiment does not limit the specific dimensions of the components, as long as the components are assembled and adapted.

[0029] This pressure holding device includes a housing 1, an end cap 2, a bushing 3, a clamping nut 4, a filter screen 5, an inlet valve spring 6, an outlet valve spring 7, an inlet valve 8, an outlet valve 9, and a sealing ring 10. The housing 1 is a rotating hollow structure, with a connecting thread 15 machined at one end to connect with the aircraft's volume device or piping system. The connecting thread 15 is an HB4-3 external thread connector. An outlet 12 communicating with the inner cavity of the housing 1 is opened inside the connecting thread 15 end of the housing 1. A standard internal thread is opened at the end of the housing 1 away from the connecting thread 15, and a stepped surface is machined on the inner side of the housing 1 to provide a mating basis for the outlet seal.

[0030] End cap 2 is also a rotating hollow structure. One end is a standard external thread connector that is compatible with the standard internal thread of shell 1, and the other end is a circular flange structure, which serves as the connection end for connecting with the outer skin of the aircraft. An air inlet 11 communicating with the inner cavity of end cap 2 is provided in the middle of the flange to provide a channel for outside air to enter.

[0031] The vent valve 9 has a hollow structure with an independent inner cavity. An annular rubber body 13 is vulcanized at the end of the vent valve 9 near the connecting thread 15 of the housing 1. The annular rubber body 13 can be pressed tightly against the inner stepped surface of the housing 1 to form an vent sealing structure. A conical rubber body 14 is vulcanized at the end of the vent valve 8 away from the connecting thread 15 of the housing 1. The conical rubber body 14 can be pressed tightly against the inner surface of the vent valve 9 to form an inlet sealing structure.

[0032] The assembly steps for this device are as follows:

[0033] The conical rubber body 14 is fixed to the rod-shaped end of the intake valve 8 away from the intake valve 8. The intake valve 8 is placed into the inner cavity of the exhaust valve 9. Then, the intake valve spring 6 is installed into the inner cavity of the exhaust valve 9, so that one end of the intake valve spring 6 abuts against the groove of the intake valve 8. Then, the inner hole of the bushing 3 is inserted into the rod-shaped end of the intake valve 8. The bushing 3 and the inner cavity of the exhaust valve 9 are fixedly connected by threads, so that the other end of the intake valve spring 6 is engaged in the groove of the bushing 3. The assembly of the intake valve assembly is completed. After assembly, the intake valve 8 can slide axially along the inner wall of the exhaust valve 9 and the bushing 3.

[0034] The assembled intake valve 8 is placed into the inner cavity of the housing 1. Then, the exhaust valve spring 7 is installed into the inner cavity of the housing 1, so that one end of the exhaust valve spring 7 abuts against the groove of the exhaust valve 9. Then, the inner hole of the clamping nut 4 is inserted into the rod-shaped end of the exhaust valve 9. The clamping nut 4 is fixedly connected to the inner cavity of the housing 1 by threads, so that the other end of the exhaust valve spring 7 is engaged in the groove of the clamping nut 4. The assembly of the exhaust valve assembly is completed. After assembly, the exhaust valve 9 can slide axially along the inner wall of the end cover 2.

[0035] The filter screen 5 is fixedly installed at the end face of the air inlet 11 inside the end cover 2, so that the filter screen 5 completely covers the end face opening of the air inlet 11, thereby filtering and intercepting the outside air entering the device.

[0036] The sealing ring 10 is embedded between the standard internal thread of the housing 1 and the standard external thread of the end cover 2. Then, the standard external thread connector of the end cover 2 is screwed into the standard internal thread end of the housing 1 to complete the sealed and fixed connection between the housing 1 and the end cover 2, forming a sealed inner cavity of the whole device. The sealing ring 10 is an elastic sealing element to achieve static sealing at the connection between the two.

[0037] The working principle of this invention is as follows: In use, one end of the housing 1 of the device is connected to the aircraft's volumetric device or piping system via a connecting thread 15, and one end of the end cover 2, where the flange is located, is connected to the outer skin of the aircraft. The entire device achieves adaptive pressure control through the coordinated operation of the internal air intake, air intake valve 8, and air exhaust valve 9, combined with the elastic pressing and reset action of the air intake valve spring 6 and the air exhaust valve spring 7. The core working states are divided into three types: bidirectional sealing, overpressure exhaust, and negative pressure inflation. The operating logic and corresponding technical effects of each state are as follows:

[0038] Two-way sealing condition (pressure within design range)

[0039] When the pressure inside the aircraft's volumetric device or piping system is within the preset design range, the device is in a two-way sealed state, requiring no air intake or exhaust operation. Structurally, this avoids the inefficiency of traditional devices that still require redundant components to be on duty when there is no pressure fluctuation.

[0040] At this time, under the elastic clamping force of the outlet valve 7, the outlet valve 9 is tightly fitted with the inner stepped surface of the housing 1 through the vulcanized annular rubber body 13 at one end, thus sealing the outlet passage; the inlet valve 8 is tightly fitted with the inner surface of the outlet valve 9 through the vulcanized conical rubber body 14 at one end, thus sealing the inlet passage, under the clamping force of the inlet valve spring 6. The synergistic effect of the dual sealing structure ensures the sealing reliability of the device when the pressure is stable. Compared with the traditional separate exhaust and intake devices, there is no need to control the sealing status of the two sets of equipment separately. The automation further improves the working stability, and there is no additional energy consumption, resulting in higher working efficiency.

[0041] Overpressure venting condition (pressure exceeds design value)

[0042] When the pressure in the aircraft's volumetric device or piping system increases due to changes in the medium or operating conditions and exceeds the design value, the device automatically triggers the overpressure venting function, which solves the problems of low pressure matching accuracy and lagging venting control in traditional devices.

[0043] At this time, the thrust generated by the internal pressure of the system overcomes the sealing force of the exhaust valve spring 7, pushes the exhaust valve spring 7 to compress, and the exhaust valve 9 moves axially towards one end of the end cover 2. The annular rubber body 13 at its end separates from the inner sealing surface of the housing 1, the pressure holding device opens in the positive direction, and the gas inside the system is discharged outward through the sealing gap.

[0044] During the exhaust process, the device can adjust the opening and closing degree of the exhaust channel in real time according to the pressure change, so as to achieve precise matching of pressure and flow. Compared with the rough exhaust of the traditional exhaust device, the error is smaller and the control accuracy is higher.

[0045] When the internal pressure of the system drops to the design value as the exhaust is discharged, the elastic restoring force of the exhaust valve spring 7 pushes the exhaust valve 9 back to its original position, and the annular rubber body 13 is pressed and sealed again with the inner stepped surface of the housing 1. The device closes in the forward direction, and the exhaust operation stops automatically. No manual intervention is required throughout the process, and the degree of automation is far higher than that of traditional exhaust devices that require manual or semi-manual control.

[0046] Negative pressure inflation state (pressure lower than design value)

[0047] When the pressure inside the aircraft's volumetric device or piping system drops below the design value, the device automatically triggers the negative pressure inflation function, which makes up for the shortcomings of traditional air intake devices such as insufficient flow matching accuracy and lack of guaranteed air cleanliness.

[0048] At this time, the pressure difference formed by the external atmospheric pressure and the negative pressure inside the system overcomes the sealing force of the intake valve spring 6, pushes the intake valve spring 6 to compress, and the intake valve 8 moves axially away from the end cover 2. The conical rubber body 14 at its end separates from the sealing surface of the exhaust valve 9, and the pressure holding device opens in the reverse direction. External air enters the device through the small hole in the middle of the end cover.

[0049] Before air enters, it will pass through the filter screen 5 installed inside the end cover 2 to effectively intercept impurities and ensure the cleanliness of the gas entering the system, solving the problem that traditional air intake devices do not have a dedicated filtration structure and are prone to introducing pollutants.

[0050] During inflation, the device adjusts the air intake channel in real time according to the pressure rise in the system, so as to achieve precise matching between the air intake flow and the system pressure, avoid over-inflation or under-inflation, and improve the accuracy of pressure control.

[0051] When the internal pressure of the system rises back to the design value, the elastic restoring force of the intake valve spring 6 pushes the intake valve 8 back to its original position, and the conical rubber body 14 presses and seals against the inner surface of the exhaust valve 9 again. The device closes in reverse, the inflation operation stops automatically, and the entire process is automated. There is no need to operate the intake device separately, which greatly improves the efficiency of pressure replenishment.

[0052] Overall, the device integrates the intake and exhaust functions into one unit, replacing the separate exhaust and intake devices in traditional technology. This achieves miniaturization and weight reduction in structure, solving the problem of large space occupation in traditional devices.

[0053] Simultaneously, the mechanical linkage of the intake valve spring 6, the exhaust valve spring 7, the intake valve 8, and the exhaust valve 9 enables adaptive pressure control without manual intervention, significantly improving the degree of automation. Furthermore, during the intake and exhaust processes, the flow rate can be precisely matched in real time according to pressure changes, solving the pain point of low pressure and flow matching accuracy in traditional devices. Combined with the filtration function of the filter screen 5, the cleanliness of the intake air is guaranteed. In addition, the integrated structure of the device reduces connecting parts and control nodes, improving the overall reliability of operation and achieving efficient, accurate, and stable pressure maintenance of the aircraft's volumetric devices and piping systems.

[0054] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A pressure maintaining device, characterized in that, For automatically controlling the pressure within the volumetric device and piping system of an aircraft and maintaining the pressure value within a set range, it includes a shell (1) with a rotating hollow structure and an end cap (2), wherein the shell (1) and the end cap (2) are sealed together to form the inner cavity of the device; The device is equipped with an air outlet valve (9) that can slide axially and realize air outlet on / off control, an air outlet valve spring (7) that provides sealing pressure and reset power for the air outlet valve (9), and a clamping nut (4) that cooperates with and positions the air outlet valve spring (7). The air outlet valve (9) is provided with an inner cavity, in which an air inlet valve (8) that can slide axially and realize air inlet on / off control is installed, an air inlet valve spring (6) that provides sealing pressure and reset power for the air inlet valve (8), and a bushing (3) that cooperates with and positions the air inlet valve spring (6). The end cap (2) is fitted with a filter screen (5) to filter the outside air entering the device, and a sealing ring (10) is provided at the connection between the housing (1) and the end cap (2) to achieve a seal. One end of the housing (1) is provided with a connecting thread (15) for connecting to the aircraft volume device or pipeline system, and the other end is adapted to be connected to the end cap (2). The end of the end cap (2) away from the housing (1) is provided with a connecting end for connecting to the outer skin of the aircraft.

2. The pressure maintaining device according to claim 1, characterized in that: The connecting thread (15) of the housing (1) is an HB4-3 external thread connector. The end of the housing (1) away from the connecting thread (15) is provided with a standard internal thread. The end of the end cover (2) connected to the housing (1) is provided with a standard external thread connector that is compatible with the standard internal thread. The connecting end of the end cover (2) is a circular flange. The air inlet (11) communicating with the inner cavity of the end cover (2) is opened in the middle of the flange.

3. The pressure maintaining device according to claim 1, characterized in that: One end of the air outlet spring (7) is installed in the groove of the clamping nut (4), and the other end is installed in the groove of the air outlet valve (9). The air outlet valve (9) contacts the inner wall of the end cover (2) and slides axially along it.

4. The pressure maintaining device according to claim 1, characterized in that: One end of the intake valve spring (6) is installed in the groove of the bushing (3), and the other end is installed in the groove of the intake valve (8). The intake valve (8) contacts the exhaust valve (9) and the inner wall of the bushing (3) and slides axially along them.

5. The pressure maintaining device according to claim 1, characterized in that: The end of the vent valve (9) near the connecting thread (15) of the housing (1) is vulcanized with an annular rubber body (13) to achieve vent sealing. The annular rubber body is used to press and fit with the stepped surface of the housing (1) to form an vent sealing structure.

6. The pressure maintaining device according to claim 1, characterized in that: The end of the air intake valve (8) away from the connecting thread (15) of the housing (1) is vulcanized with a conical rubber body (14) to achieve an air intake seal. The conical rubber body (14) is used to press and fit with the inner surface of the air outlet valve (9) to form an air intake seal structure.

7. The pressure maintaining device according to claim 2, characterized in that: The filter (5) is fixedly installed at the end face of the air inlet (11) inside the end cover (2), and the filter (5) completely covers the air inlet (11).

8. The pressure maintaining device according to claim 1, characterized in that: The bushing (3) is fixedly connected to the inner cavity of the air outlet valve (9) by a thread, and the clamping nut (4) is fixedly connected to the inner cavity of the housing (1) by a thread, so as to realize the axial positioning of each component in the inner cavity of the device.

9. The pressure maintaining device according to claim 1, characterized in that: The air outlet (12) inside the connecting thread (15) of the housing (1) is connected to the inner cavity of the housing (1) to realize gas flow between the device and the aircraft volume device or pipeline system.

10. The pressure maintaining device according to claim 1, characterized in that: The sealing ring (10) is an elastic sealing element, which is embedded between the threaded connection mating surfaces of the housing (1) and the end cover (2) to achieve static sealing at the connection point of the two.

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