Exhaust valve vibration force device

Abstract

The present application relates to the technical field of vibration fixture design of air product exhaust valve, and particularly relates to a force applying device which needs to apply corresponding force on the disc plate of an exhaust valve during a vibration test of the exhaust valve. The exhaust valve to be tested comprises a valve shell, an exhaust valve disc plate and a rotating shaft of the exhaust valve. The exhaust valve disc plate is fixed in the valve shell through the rotating shaft of the exhaust valve and horizontally swings with the rotating shaft of the exhaust valve. The vibration force applying device comprises a valve fixture, a spring limiting rod, a rectangular spring, a spring supporting block, a valve conversion block, a shaft and a cylindrical roller bearing. The vibration force applying device can apply vibration force to the exhaust valve according to a given vibration value and additionally apply force to the disc plate of the exhaust valve. During the vibration process, the force is evenly and stably transmitted to the disc plate of the exhaust valve, and the vibration force applying device has sufficient service life and can perform reproducible verification tests.

Description

Technical Field

[0001] This invention relates to the field of design technology for vibration fixtures for exhaust valves of aviation products, and in particular to a force-applying device on the disc plate of an exhaust valve that requires the application of a corresponding force during vibration testing of an exhaust valve of an aviation product. Background Technology

[0002] When the exhaust valve is in operation, it needs to withstand temperature stress, vibration stress, and pressure differential stress between the inside and outside of the cargo hold. During in-flight adjustment, the maximum pressure differential occurs between the inside and outside of the cargo hold, and the exhaust valve reaches its minimum adjustment opening. To simulate the pressure differential force generated under exhaust valve vibration, a force-applying device needs to be designed. To apply force to the exhaust valve, the pressure differential stress is converted into the force on the disc plate: F=P×S F — Force exerted by the disc (N) P—Maximum pressure difference between inside and outside the cabin (kPa) S—Area under stress (m²) The traditional design method involves first fixing the valve to a vibration fixture, then fixing one end of a rubber band to the valve disc and the other end to the vibration fixture. The tension applied to the rubber band is then measured as the force exerted on the disc. This method has several problems: ① The rubber band has a short lifespan, is prone to aging, requires frequent replacement, cannot reproduce previously conducted tests, and has poor data traceability. ② To tighten the rubber band and achieve sufficient applied force, the vibration-applying fixture is larger than the pure vibration fixture, resulting in poor load transfer characteristics. ③ The rubber band is prone to breakage during the vibration test, affecting data acquisition. ④ The rubber band fixation is unreliable; the valve disc rotates continuously during vibration, affecting the rubber band's tension and causing unstable force. Summary of the Invention

[0003] The purpose of this invention is to provide an exhaust valve vibration force application device that applies a vibration force to the exhaust valve at a given vibration value while simultaneously applying an additional force to the exhaust valve disc. During the vibration process, the force is transmitted evenly and stably to the exhaust valve disc, and the vibration force application device has a sufficient service life for reproducible verification tests.

[0004] The technical solution of the present invention: To achieve the above-mentioned objectives, a vibration force-applying device for an exhaust valve is proposed. The exhaust valve to be tested includes a valve housing, an exhaust valve disc, and an exhaust valve rotating shaft. The exhaust valve disc is fixed inside the valve housing via the exhaust valve rotating shaft and swings horizontally with the exhaust valve rotating shaft. The vibration force-applying device includes: a valve clamp, a spring limiting rod, a rectangular spring, a spring support block, a valve conversion block, a shaft, and a cylindrical roller bearing. The valve clamp includes an upper clamping plate and a lower clamping plate fixedly connected by bolts. The upper clamping plate has a through hole in its center, and the valve housing is fixed to the upper clamping plate. A vibration device is externally connected to the lower end of the lower clamping plate. A spring limiting rod is fixed to the lower clamping plate at the position corresponding to the through hole of the upper clamping plate. A rectangular spring is fitted onto the spring limiting rod. The lower end of the spring support block has an opening and is fitted onto the upper end of the spring limiting rod. The top of the inner cavity of the spring support block has a groove that fits into the spring limiting rod, and the protrusions around the groove contact the rectangular spring. A cylindrical roller bearing is fitted and fixed to the shaft, and the shaft is fixed to the top of the spring support block. The top of the spring support block has a groove for accommodating the cylindrical roller bearing. The valve conversion block is hollow and semi-cylindrical, attached and fixed to the outer circle of the exhaust valve rotating shaft. The outer circle of the valve conversion block is tangentially engaged with the cylindrical roller bearing. When the valve conversion block is fixedly connected to the valve drive shaft, due to the spatial position of the valve disc and the effect of gravity, the outer circle of the valve conversion block is pressed against the cylindrical roller bearing, which in turn drives the spring support block to compress the rectangular spring, thereby applying force to the valve disc. When the exhaust valve disc rotates, the outer circle of the valve conversion block is pressed against the cylindrical roller bearing, which enables continuous and stable application of force to the valve disc.

[0005] In one possible embodiment, a limiting plate is further included, which is disposed on both sides of the spring support block and fixed to the lower clamping plate respectively. The contact surface between the limiting plate and the spring support block is fitted with a small clearance.

[0006] In one possible embodiment, the exhaust valve to be tested further includes an electric mechanism, and the force-applying device further includes a bracket and a bracket base. The bracket base has a double-ear structure and is fixed to the side of the lower clamping plate. The bracket and the double-ear structure of the bracket base are rotatably connected and fixed by fastening screws when they reach a designated position. The electric mechanism located on the side of the valve housing is supported by the bracket.

[0007] In one possible embodiment, the spring support block is provided with an arcuate groove for limiting the shaft, and the shaft is embedded and fixed in the annular groove.

[0008] In one possible embodiment, the spring limiting rod is fixedly connected to the lower clamping plate by threads.

[0009] In one possible embodiment, the specific method for achieving the required force value by controlling the compression amount of the rectangular compression spring includes: determining the force value applied to the exhaust valve disc; selecting N rectangular compression springs of a certain specification according to the area of ​​the exhaust valve disc to be tested, performing a compression test on each rectangular compression spring, obtaining the standard compression curve of each rectangular compression spring, and comparing the obtained compression amount with the height difference between the free state of the exhaust valve and the height difference between the exhaust valve fixedly installed on the fixture to verify whether the force value has been achieved.

[0010] In one possible embodiment, the lower part of the clamp is connected to the vibration device, and the mounting holes are evenly distributed and designed as symmetrical octagons.

[0011] In one possible embodiment, the rectangular compression spring is made of an alloy.

[0012] The beneficial effects of this invention are: it achieves the function of applying force to the exhaust valve under vibration, while ensuring the service life of the force-applying device, covering the service life of the exhaust valve, and enabling reproducible test verification. The applied force is stable and reliable during vibration, the fixture has a compact overall structure, is easy to operate, and can be effectively extended to other exhaust valves. Attached Figure Description

[0013] Figure 1A This is a front view outline of a preferred embodiment of the present invention; Figure 1B This is the AA section view in Figure 1; Figure 1C This is a global view of a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the compression curve of a certain type of rectangular compression spring; Figure 3 It is a diagram of a rolling bearing; Figure 4 This is a working diagram of a rolling bearing; Figure 5 This is a schematic diagram of the limit rod; Figure 6 This is a schematic diagram of the limit block; Figure 7 This is a schematic diagram of the bracket fixing method; Figure 8 This is an installation diagram of a certain type of exhaust valve 1; Figure 9 This is a schematic diagram of the installation of a certain type of exhaust valve 2. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0016] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] like Figures 1A-1C As shown, 1-8 and 13-15 are respectively the lower part of the clamp, the upper part of the clamp, the rectangular spring, the spring limit rod, the spring support block, the valve conversion block, the bracket, the bracket base, the shaft, the cylindrical roller bearing, and the limit plate. 9-12 and 16 are pins and threaded sleeves of different specifications. The lower part 1 of the clamp is connected to the vibration equipment to apply vibration stress.

[0018] The core of the invention is the use of a rectangular compression spring to apply force. The service life of a rectangular compression spring is 300,000 to 1,000,000 cycles, and the exhaust valve undergoes a force-induced vibration test approximately once a year, thus completely covering the service life of the exhaust valve. The spring support block 5 and the cylindrical roller bearing 14 are fixed as a whole and act on the rectangular compression spring 3. The valve adapter block 6 and the exhaust valve disc are fixed as a whole. The exhaust valve housing is fixed on the upper part 2 of the clamp. After the exhaust valve is fixed, it forms a compressive force on the rectangular compression spring, which reacts on the valve disc. When the valve disc performs the opening and closing flipping action, the valve adapter block 6 moves with the cylindrical roller bearing 14. The spring compression remains unchanged, and the force remains stable.

[0019] Select appropriate models and quantities of rectangular compression springs, and apply the spring compression force to the valve disc. Based on the area of ​​the exhaust valve disc, select an appropriate number and specifications of rectangular compression springs, and then perform a compression test on each rectangular compression spring. An example of a compression curve is shown below. Figure 2 As shown, after calculating the compression amount of the compression spring, when designing the fixture, the compression amount is the height difference between the free state of the exhaust valve and the height of the exhaust valve fixedly installed on the fixture.

[0020] The compression spring and valve disc are connected by a rolling bearing to ensure stable force on the disc when the exhaust valve flips. The exhaust valve requires continuous flipping of the valve plate under vibration, while simultaneously experiencing pressure differential force. If the spring force acts directly on the valve plate, the spring compression and corresponding compressive force will constantly change with the valve plate's movement, failing to meet usage requirements. Using a cylindrical roller bearing for the transition connection ensures that the spring compression is already established after the exhaust valve is fixed. When the valve plate flips, it rotates with the rolling bearing, maintaining a constant spring compression and compressive force, thus keeping the force acting on the exhaust valve disc plate stable. (See diagram of the rolling bearing.) Figure 3 As shown, the working diagram of the rolling bearing is as follows: Figure 4 As shown.

[0021] The spring support block and bearing are constrained by a limiting plate and a spring limiting rod, allowing only vertical compression of the rectangular spring. Because the exhaust valve is subjected to vibration stress, typically in three mutually perpendicular directions, unconstrained springs under vibration will exhibit twisting and oscillation, resulting in unstable compression force and unstable force acting on the exhaust valve disc. Therefore, limiting rods and limiting blocks are designed, such as… Figure 5 and Figure 6 As shown, the lower end of the limiting rod is threaded and fixed to the lower part 2 of the clamp. A rectangular spring is inserted into the limiting rod to ensure that the rectangular spring is only compressed vertically. The limiting plate ensures that the spring will not move left or right when it is compressed up and down, thus ensuring the stability of the compression force transmission.

[0022] The overall structure is designed based on the shape and connection requirements of the exhaust valve. The fixture has a compact structure, reasonable layout, and is easy to disassemble and assemble. The center of gravity of the exhaust valve is lowered to ensure the transmission characteristics of the fixture under vibration.

[0023] The lower part of the fixture connects to the vibrating equipment. The mounting holes are evenly distributed and designed in a symmetrical octagonal shape. Excess material is removed. Figure 7 As shown in Figure 1, the vibration is effectively transmitted to the fixture. The upper part of the fixture also retains usable material, which is evenly fixed to the bottom of the fixture with screws. The exhaust valve is fixed to the upper part of the fixture, resulting in good vibration transmission characteristics. The fixture components are installed sequentially from top to bottom, making operation simple.

[0024] Figure 8 and Figure 9 These are two examples of the exhaust valve force-applying device under vibration conditions according to the present invention.

[0025] Among them, Ⅰ is the exhaust valve force-applying device under vibration, Ⅱ is the exhaust valve housing, Ⅲ is the exhaust valve disc, Ⅳ is the exhaust valve rotating shaft, Ⅴ is the exhaust valve electric structure, and Ⅵ is the exhaust valve disc fixing point.

[0026] I. The inventive points of this invention have been described in detail. The connection points between the exhaust valve and I are VI. Exhaust valve disc fixing point, II. Exhaust valve housing, and V. Exhaust valve electric mechanism. First, connect the lower part 1 of the clamp of I to the vibration equipment. Then, insert bolts sequentially into the valve disc hole, the rotating shaft hole, and the valve adapter block 6 of I for fixing. Next, connect the exhaust valve housing to the upper part 2 of the clamp of I using bolts or clamps. Then, fix the upper part of the clamp and the upper part of the clamp. Spring compression force is formed and acts on the valve disc. Finally, adjust the bracket 7 of I and fix the bracket and the electric mechanism of the exhaust valve.

[0027] Under vibration, the exhaust valve electric mechanism receives a command and drives the valve disc to flip. The spring support block 5 of I and the cylindrical roller bearing 14 rotate the shaft and continuously transmit force to the exhaust valve.

[0028] The bracket 7 of the exhaust valve electric mechanism is mounted on the bottom of the fixture. The bracket base 8 and the bracket 7 are connected by a bushing, allowing the bracket to be adjusted and rigidly fixed to the exhaust valve electric mechanism to avoid installation stress. Figure 7 As shown, this ensures that the overall fixture is minimized while installing with the vibration equipment.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An exhaust valve vibration force amplifying device characterized by comprising: The exhaust valve to be tested includes a valve housing, an exhaust valve disc, and an exhaust valve rotating shaft; the exhaust valve disc is fixed inside the valve housing by the exhaust valve rotating shaft and swings horizontally with the exhaust valve rotating shaft; the vibration force application device includes: a valve clamp, a spring limit rod, a rectangular spring, a spring support block, a valve conversion block, a shaft, and a cylindrical roller bearing; The valve clamp includes an upper clamping plate and a lower clamping plate fixedly connected by bolts. The upper clamping plate has a through hole in its center, and the valve housing is fixed to the upper clamping plate. A vibration device is externally connected to the lower end of the lower clamping plate. A spring limiting rod is fixed to the lower clamping plate at the position corresponding to the through hole in the upper clamping plate. A rectangular spring is fitted onto the spring limiting rod. A spring support block has an opening at its lower end and is fitted onto the upper end of the spring limiting rod. The top of the inner cavity of the spring support block has a groove that engages with the spring limiting rod, and the protrusions around the groove contact the rectangular spring. A cylindrical roller bearing is fitted and fixed to the shaft, which is fixed to the top of the spring support block. The top of the support block has a groove for accommodating the cylindrical roller bearing; the valve conversion block is a hollow semi-cylindrical shape, attached and fixed to the outer circle of the exhaust valve rotating shaft, and the outer circle of the valve conversion block is tangentially engaged with the cylindrical roller bearing; when the valve conversion block is fixedly connected to the valve drive shaft, due to the spatial position of the valve disc and the effect of gravity, the outer circle of the valve conversion block is pressed against the cylindrical roller bearing, and drives the spring support block to compress the rectangular spring, thereby applying force to the valve disc; when the exhaust valve disc rotates, the outer circle of the valve conversion block is pressed against the cylindrical roller bearing, which enables continuous and stable force to be applied to the valve disc.

2. A vibration force amplifier for an exhaust valve according to claim 1, wherein It also includes a limiting plate, which is disposed on both sides of the spring support block and fixed to the lower clamping plate respectively. The contact surface between the limiting plate and the spring support block is a small clearance fit.

3. The vibration force amplifier of claim 1, wherein The exhaust valve to be tested also includes an electric mechanism, and the force-applying device also includes a bracket and a bracket base. The bracket base has a double-ear structure and is fixed to the side of the lower clamping plate. The bracket and the double-ear structure of the bracket base are connected to rotate relative to each other and are fixed by fastening screws when they reach the designated position. The electric mechanism located on the side of the valve housing is supported by the bracket.

4. The vibration force amplifier of claim 1, wherein The spring support block is provided with an arc-shaped groove for limiting the shaft, and the shaft is embedded and fixed in the annular groove.

5. The vibration force amplifier of claim 1, wherein The spring limiting rod is fixedly connected to the lower clamping plate by threads.

6. The vibration force amplifier of claim 1, wherein The lower part of the clamp is connected to the vibration equipment, and the mounting holes are evenly distributed and designed as symmetrical octagons.

7. The vibration force amplifier of claim 1, wherein The rectangular spring is made of an alloy.

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