Aviation low-flow-resistance valve device

Abstract

The utility model discloses an aviation low-flow-resistance valve device, and particularly relates to the field of valve devices, the aviation low-flow-resistance valve device comprises a diaphragm box cover, a corrugated pipe, a shell cover and a sliding rod which are welded into a whole, the diaphragm box cover is connected to the end of the corrugated pipe and the end of the shell cover, the corrugated pipe is located in the shell cover, and the sliding rod is located in the corrugated pipe. The end, away from the diaphragm box cover, of the shell cover is connected with a valve seat through a bolt, one end of the sliding rod penetrates through the shell cover and extends into the valve seat, the valve seat is connected with a lubricating oil system, a sealing valve moving back and forth is arranged in the valve seat, and the end of the sealing valve is connected with the end of the sliding rod. Opening of the sealing valve on the right side is achieved by controlling the sealing area of the sealing valve and the pre-tightening force of the spring, so that control over the pressure in a lubricating oil system cavity is achieved, the circulation area of ventilation gas can be guaranteed in all states, exhaust resistance is reduced, the pressure in the lubricating oil system cavity is reduced, and the requirement for large ventilation quantity is met.

Description

Technical Field

[0001] The utility model relates to the field of valve devices, and more specifically, to an aviation low-flow-resistance valve device. Background Art

[0002] At present, the valve device used in the lubricating oil system of an aero-engine can sense the changes in the external atmospheric pressure, the pressure and temperature in the lubricating oil system cavity, and adjust the gas flow area by changing the working stroke of the bellows, so as to adjust the pressure in the lubricating oil system to be kept within a proper range. However, the valve device in the prior art has obvious disadvantages: due to the limitation of the structure, its exhaust path is long, the flow area is small, and there is reflux during the gas flow process, resulting in excessive exhaust resistance, which in turn causes excessive pressure in the lubricating oil system cavity and has an adverse impact on the sealing performance and reliability of the system. With the continuous development of aero-engines, the flight envelope of the engine and the pressure change range of the lubricating oil system are larger, and the ventilation volume of the system also increases accordingly. The existing valve device can no longer solve the problem of excessive exhaust resistance, and it is urgent to develop a valve device with a new structure. Summary of the Utility Model

[0003] To solve the above technical problems, the utility model provides an aviation low-flow-resistance valve device, which includes a diaphragm cover, a bellows, a housing cover and a sliding rod welded into a whole. The diaphragm cover is connected to the ends of the bellows and the housing cover. The bellows is located inside the housing cover, and the sliding rod is located inside the bellows. A valve seat is connected to the end of the housing cover away from the diaphragm cover by bolts. One end of the sliding rod penetrates through the housing cover and extends into the valve seat. The valve seat is connected to the lubricating oil system. A sealing valve that moves back and forth is arranged inside the valve seat. The end of the sealing valve is connected to the end of the sliding rod. The sliding rod moves back and forth inside the valve seat through the bellows, and the sealing valve moves back and forth inside the valve seat through the sliding rod and the bellows.

[0004] In a preferred embodiment, a through first air hole is opened at the end of the valve seat away from the diaphragm cover, and a through air groove is opened on the outer wall of the valve seat. The diameter of the end of the sealing valve away from the sliding rod is larger than that of the first air hole and covers the first air hole during the back-and-forth movement.

[0005] In a preferred embodiment, a recessed slot is opened at the end of the sliding rod located outside the housing cover, a spring is installed in the slot, one end of the sealing valve close to the sliding rod extends into the slot and is connected to the spring, and a snap ring for limiting the end of the sealing valve in the slot is also arranged in the slot.

[0006] In a preferred embodiment, a plurality of second air holes are further opened at the end of the housing cover away from the diaphragm cover, and the space between the outside of the bellows and the inside of the housing cover is communicated with the inside of the valve seat through the second air holes.

[0007] In a preferred embodiment, an internal hollow limiting tube is fixed on the inner wall of the membrane box cover, an inwardly recessed limiting hole is opened at the end of the sliding rod located inside the corrugated tube, the limiting tube is inserted into the limiting hole, and a plurality of penetrating connecting holes are opened at one end of the limiting tube close to the membrane box cover.

[0008] Technical effects and advantages of the utility model:

[0009] 1. The utility model realizes the opening of the right sealing valve by controlling the sealing area of ​​the sealing valve and the preload force of the spring, thereby realizing the control of the pressure in the lubricating oil system cavity, ensuring the flow area of ​​the ventilation gas in various states, reducing the exhaust resistance, reducing the pressure in the lubricating oil system cavity, and meeting the requirements of large ventilation volume;

[0010] 2. The gas exhaust channel in the low flow resistance valve is short, the airflow has no return, the exhaust is smooth, and the pressure change response is sensitive, which improves the ventilation performance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the utility model when the valve is opened;

[0013] Figure 3 This is a schematic diagram of the internal cross-sectional structure of the utility model when the valve is closed;

[0014] Figure 4 It is a schematic diagram of the internal sectional structure of the utility model.

[0015] Explanation of the reference numerals: 1 diaphragm box cover, 2 bellows, 3 housing cover, 4 sliding rod, 5 valve seat, 6 sealing valve, 7 first air hole, 8 air groove, 9 slot, 10 spring, 11 retaining spring, 12 second air hole, 13 limiting tube, 14 limiting hole, 15 connecting hole. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific purposes.

[0017] like Figures 1-4An aviation low-flow-resistance valve device shown in the figure includes a diaphragm cover 1, a bellows 2, a housing cover 3, and a slide rod 4 welded into a whole. The diaphragm cover 1 is connected to the ends of the bellows 2 and the housing cover 3. The bellows 2 is located inside the housing cover 3, and the slide rod 4 is located inside the bellows 2. A valve seat 5 is connected by bolts to the end of the housing cover 3 away from the diaphragm cover 1. One end of the slide rod 4 penetrates through the housing cover 3 and extends into the interior of the valve seat 5. The valve seat 5 is connected to the lubricating oil system. A sealing valve 6 that moves back and forth is provided inside the valve seat 5. The end of the sealing valve 6 is connected to the end of the slide rod 4. The slide rod 4 moves back and forth inside the valve seat 5 through the bellows 2, and the sealing valve 6 moves back and forth inside the valve seat 5 through the slide rod 4 and the bellows 2.

[0018] Based on the above, the diaphragm cover 1, the bellows 2, the housing cover 3, and the slide rod 4 are welded to form a component, and this component is subjected to vacuum pumping after welding is completed.

[0019] The device is fixed by the valve seat 5. The bellows 2 expands and contracts according to the change of the internal and external pressure difference, thereby driving the slide rod 4 and the sealing valve 6 to expand and contract, realizing the opening and closing of the valve.

[0020] A through first air hole 7 is opened at the end of the valve seat 5 away from the diaphragm cover 1. An air groove 8 that penetrates is opened on the outer wall of the valve seat 5. The diameter of the end of the sealing valve 6 away from the slide rod 4 is larger than that of the first air hole 7 and covers the first air hole 7 during the back-and-forth movement.

[0021] A recessed slot 9 is opened at the end of the slide rod 4 outside the housing cover 3. A spring 10 is installed in the slot 9. One end of the sealing valve 6 close to the slide rod 4 extends into the interior of the slot 9 and is connected to the spring 10. A snap ring 11 that limits the end of the sealing valve 6 in the slot 9 is also provided in the slot 9.

[0022] Based on the above, the spring 10 and the sealing valve 6 are installed together into the hole of the slide rod 4 (the spring 10 is in a pre-compressed state), the sealing valve 6 is limited by the snap ring 11, and finally the valve seat 5 and the housing cover 3 are connected by bolts.

[0023] A number of second air holes 12 are also opened at the end of the housing cover 3 away from the diaphragm cover 1. The space between the outside of the bellows 2 and the inside of the housing cover 3 is communicated with the inside of the valve seat 5 through the second air holes 12.

[0024] A hollow limiting tube 13 is fixed on the inner wall of the diaphragm cover 1. A recessed limiting tube 14 is opened at the end of the slide rod 4 located inside the bellows 2. The limiting tube 13 is inserted into the interior of the limiting tube 14. A number of through connection holes 15 are opened at the end of the limiting tube 13 close to the diaphragm cover 1.

[0025] Furthermore, when the device is on the ground, the sealing chamber formed between the bellows 2 and the shell cover 3 and the diaphragm box cover 1 is in a vacuum state, the bellows 2 is in a compressed state, and at the same time, the diaphragm box cover 1 is designed with a limit tube 13 and a limit tube 14 to cooperate to limit the compression displacement of the bellows 2. At this time, the sealing valve 6 is in an open state.

[0026] As the device rises with the flight altitude, the bellows 2 does not produce displacement changes before the action altitude. When the device is at the set altitude, the external atmospheric pressure decreases due to the increase in altitude, and the force generated by the pressure difference is just balanced with the force generated by the bellows 2. The sealing valve 6 starts to move to the right, and the gas in the lubricating oil system cavity can be discharged to the outside through the first air hole 7 and the air groove 8 through the gap between the valve seat 5 and the sealing valve 6.

[0027] When the height continues to rise, the bellows 2 stretches, and the air inside the housing cover 3 is discharged to the outside through the second air hole 12 and the air groove 8. The sealing valve 6 and the slide rod 4 gradually move to the right, so that the sealing valve 6 is closed. When the bellows 2 is at the set closing height, the output displacement of the bellows 2 reaches the maximum. At this time, the sealing valve 6 is just in the closed state. If you want to open the right sealing valve 6 again, the difference between the cavity pressure of the lubricating oil system and the external pressure needs to be greater than the preload force of the spring 10, so as to ensure the pressure in the cavity.

[0028] The utility model controls the action and closing of the sealing valve 6 by controlling the stiffness and preload displacement of the bellows 2, and realizes the opening of the right sealing valve 6 by controlling the sealing area of ​​the sealing valve 6 and the preload force of the spring 10, thereby realizing the control of the pressure in the lubricating oil system cavity.

[0029] It can ensure the flow area of ​​ventilation gas in various states, reduce exhaust resistance, lower the pressure in the lubricating oil system cavity, and meet the requirements of large ventilation volume.

[0030] The gas exhaust channel in the low flow resistance valve is short, the airflow has no return, the exhaust is smooth, and the pressure change response is sensitive, which improves the ventilation performance of the system.

[0031] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. Structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the field unless otherwise specified and limited.

Claims

1. An aviation low flow resistance valve device, characterized in that: It includes a diaphragm box cover, a bellows, a shell cover and a sliding rod welded as a whole, the diaphragm box cover is connected to the ends of the bellows and the shell cover, the bellows is located inside the shell cover, the sliding rod is located inside the bellows, a valve seat is connected to the end of the shell cover away from the diaphragm box cover by bolts, one end of the sliding rod penetrates the shell cover and extends to the inside of the valve seat, the valve seat is connected to the lubricating oil system, a sealing valve that moves back and forth is provided inside the valve seat, the end of the sealing valve is connected to the end of the sliding rod, the sliding rod moves back and forth inside the valve seat through the bellows, and the sealing valve moves back and forth inside the valve seat through the sliding rod and the bellows.

2. The low flow resistance valve device for aviation according to claim 1, characterized in that: A first air hole is provided at one end of the valve seat away from the membrane box cover, and a penetrating air groove is provided on the outer wall of the valve seat. The diameter of the sealing valve at one end away from the sliding rod is larger than the first air hole and covers the first air hole during the back and forth movement.

3. The low flow resistance valve device for aviation according to claim 1, characterized in that: An inwardly recessed groove is provided at the end of the slide rod located outside the shell cover, a spring is installed in the groove, one end of the sealing valve close to the slide rod extends into the groove and is connected to the spring, and a retaining spring is also provided in the groove to limit the end of the sealing valve in the groove.

4. The low flow resistance valve device for aviation according to claim 1, characterized in that: A plurality of second air holes are also provided at one end of the shell cover away from the membrane box cover, and the space outside the bellows and inside the shell cover is communicated with the inside of the valve seat through the second air holes.

5. The low flow resistance valve device for aviation according to claim 1, characterized in that: An internal hollow limiting tube is fixed on the inner wall of the membrane box cover, an inwardly recessed limiting hole is opened at the end of the slide rod located inside the corrugated tube, the limiting tube is inserted into the limiting hole, and a plurality of penetrating connecting holes are opened at one end of the limiting tube close to the membrane box cover.

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