Pressure sensing structure with adjustable pressure sensing hole area

Abstract

The present application belongs to the field of oxygen system design, and particularly relates to a pressure sensing structure with adjustable pressure sensing hole area. The pressure sensing structure comprises a diaphragm assembly, a seat sleeve, a pressure ring, a spring, an adjusting sheet and an adjusting screw. The seat sleeve is a box-shaped structure with an open upper end surface. The diaphragm assembly is placed on the upper end of the seat sleeve. The outer circumference of the diaphragm assembly is fixed by the pressure ring. The spring is arranged above the diaphragm assembly. The seat sleeve bottom surface is provided with a fixed-area air hole. A threaded hole is arranged beside the air hole. The adjusting screw is connected to the seat sleeve bottom surface through the adjusting sheet. The adjusting sheet can partially or completely cover the air hole by rotating around the adjusting screw. The airflow enters the pressure sensing cavity through the air hole and the adjusting sheet. The pressure acts on the diaphragm assembly and is finally transmitted to the spring. The pressure fluctuation or howling of the pressure sensing cavity during the large-flow airflow process is avoided.

Description

Technical Field

[0001] This invention belongs to the field of oxygen system design, specifically relating to a pressure-sensing structure with adjustable pressure-sensing orifice area. Background Technology

[0002] The pressure-sensing structure is an essential component of the oxygen system, primarily used in oxygen pressure regulators to sense oxygen pressure, generate displacement, and transmit force. Currently, the pressure-sensing structure in aircraft oxygen systems generally consists of a diaphragm assembly, a housing, a pressure ring, and springs. The diaphragm assembly is placed on the housing, and the outer circumference is tightened by the pressure ring to ensure airtightness. A spring is positioned above the diaphragm, and the housing has vents of a fixed area. Airflow enters the pressure-sensing chamber through these vents, and the pressure acts on the diaphragm assembly, ultimately being transmitted to the springs. However, in practical applications and during debugging, due to variations in the spring force within tolerance ranges, when the pressure-sensing orifice area is constant, high-flow-rate airflow can cause spring vibration, leading to pressure fluctuations in the pressure-sensing chamber and even whistling, resulting in structural malfunctions. Summary of the Invention

[0003] Purpose of the invention:

[0004] An adjustable pressure sensing structure with an adjustable pressure sensing orifice area is provided. During product assembly and adjustment, the pressure sensing orifice area can be easily adjusted to adapt to the spring stiffness, avoiding spring vibration, pressure fluctuation or whistling in the pressure sensing chamber during high-flow-rate air passage.

[0005] Technical solution:

[0006] An adjustable pressure-sensing structure includes: a diaphragm assembly 1, a seat 2, a pressure ring 3, a spring 4, an adjusting plate 5, and an adjusting screw 6. The seat 2 is a box-shaped structure with an open upper end. The diaphragm assembly 1 is placed on the upper end of the seat 2. The outer circumference of the diaphragm assembly 1 is fixed by the pressure ring 3. A spring is provided above the diaphragm assembly 1. A vent 7 with a fixed area is provided on the bottom surface of the seat 2. A threaded hole is provided next to the vent 7. The adjusting screw 6 passes through the adjusting plate 5 and is connected to the bottom surface of the seat 2. The adjusting plate 5 can partially or completely cover the vent 7 by rotating around the adjusting screw 6. Airflow enters the pressure-sensing chamber through the vent 7 and the adjusting plate 5. The pressure acts on the diaphragm assembly 1 and is finally transmitted to the spring.

[0007] Furthermore, the contact surface between the pressure ring 3 and the diaphragm assembly 1 has a sharp rounded corner 8.

[0008] Furthermore, the diaphragm assembly 1 includes a diaphragm body and a push rod, with the push rod fixed to the diaphragm body by welding.

[0009] Furthermore, the hardness of the diaphragm body is lower than that of the seat sleeve 2.

[0010] Furthermore, the hardness of the diaphragm body is lower than that of the pressure ring 3.

[0011] Furthermore, a step is provided at the upper end of the seat cover 2, and the diaphragm assembly 1 is placed on the step surface and tightened and fixed by the pressure ring 3.

[0012] Furthermore, there are two vent holes 7, two adjusting plates 5, and two adjusting screws 6, and the two adjusting plates 5 are used to adjust the two vent holes 7 respectively.

[0013] Furthermore, the pointed rounded corner 8 is a rounded corner with an radius of 0.5.

[0014] Beneficial effects:

[0015] This invention provides a rotatable adjustment plate on the seat cover. By rotating the adjustment plate, the area of ​​the vent hole blocked by the adjustment plate is changed, thereby changing the effective area of ​​the vent hole. During product debugging, the vent hole area can be matched with springs of different stiffness, avoiding spring vibration during use, which could lead to pressure fluctuations in the pressure sensing chamber or whistling. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the pressure-sensing structure with adjustable pressure-sensing hole area of ​​the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of the adjusting plate and adjusting screw assembly;

[0018] Among them, 1-diaphragm assembly, 2-seat sleeve, 3-pressure ring, 4-spring, 5-adjusting plate, 6-adjusting screw, 7-vent hole, 8-sharp rounded corner. Detailed Implementation

[0019] like Figure 1 and 2This invention discloses an adjustable pressure-sensing structure with an adjustable pressure-sensing orifice area, comprising a diaphragm assembly 1, a seat 2, a pressure ring 3, a spring 4, an adjusting plate 5, and an adjusting screw 6. The diaphragm assembly 1 consists of a diaphragm body and a push rod. The push rod is made of metal and is fixed to the diaphragm body by welding or other methods, ensuring an airtight connection. In this embodiment, both the diaphragm and the push rod are made of stainless steel and are connected by welding. The seat 2 is made of metal and has steps for placing the diaphragm assembly. Threads are provided above the steps, and a through hole is provided in the center of the seat for the push rod in the diaphragm assembly 1 to pass through. Near the through hole, a certain number of vent holes 7 and threaded holes are evenly distributed circumferentially. In this embodiment, the seat 2 is made of brass and has two vent holes and two threaded holes. The adjusting plate 5 is made of metal, possessing high rigidity and resistance to high-pressure oxygen environment impact. It has a through hole matching the threaded hole. The adjusting screw 6 passes through this through hole, fixing the adjusting plate 5 to the threaded hole of the seat. When the adjusting screw is loosened, the adjusting plate can rotate around it, gradually covering or fully opening the vent hole. In this example, the adjusting plate 5 is made of brass, rectangular with chamfered edges, and the adjusting screw is also made of brass. The pressure ring 3 is made of metal, with a rounded corner on its contact surface with the diaphragm, and threads on its outer circumference. In this embodiment, the pressure ring 3 is made of brass and its contact surface with the diaphragm is also rounded.

[0020] The contact surface has a radius of 0.5 mm, and the diaphragm can be pressed onto the seat 2 by the pressure ring to achieve an airtight connection. The spring 4 is made of metal and is placed above the diaphragm.

[0021] In actual operation, the gas flows through the vent hole, passes through the gap of the adjusting plate, and enters the pressure-sensing chamber. The pressure acts on the diaphragm assembly and is transmitted to the spring. When a large flow of gas passes through, if the spring vibrates, the adjusting screw is turned and the adjusting plate is rotated to change the area of ​​the adjusting plate covering the vent hole, thereby adjusting the area of ​​the pressure-sensing hole to match the spring stiffness, preventing spring vibration, and eliminating the shaking or whistling of the pressure-sensing chamber.

[0022] The present invention relates to an adjustable pressure sensing structure. By setting a rotatable adjusting plate on the seat sleeve, the area of ​​the vent hole covered by the adjusting plate can be changed, thereby adjusting the area of ​​the pressure sensing hole to match springs of different stiffness. This avoids pressure jitter or howling in the pressure sensing chamber caused by spring vibration during high-flow air passage, and improves the reliability of the pressure sensing mechanism.

Claims

1. A pressure-sensing structure with adjustable pressure-sensing orifice area, characterized in that, include: The system comprises a diaphragm assembly, a seat, a pressure ring, a spring, an adjusting plate, and an adjusting screw. There are two vent holes, two adjusting plates, and two adjusting screws, each used to adjust one vent hole. The seat is a box-shaped structure with an open upper surface. The diaphragm assembly is placed on top of the seat, and its outer circumference is fixed by the pressure ring. A spring is located above the diaphragm assembly. A vent hole of fixed area is located on the bottom surface of the seat, with a threaded hole next to it. The adjusting screw passes through the adjusting plate and connects to the bottom surface of the seat. The adjusting plate rotates around the adjusting screw to partially or completely cover the vent hole. Airflow enters the pressure-sensing chamber through the vent hole and the gap covered by the adjusting plate. Pressure is applied to the diaphragm assembly and ultimately transmitted to the spring. During product assembly and adjustment, the area of ​​the pressure-sensing hole is adjusted to adapt to the spring stiffness, preventing spring vibration and pressure fluctuations or whistling in the pressure-sensing chamber due to spring force tolerance differences during high-flow air passage.

2. The pressure-sensing structure with adjustable pressure-sensing orifice area according to claim 1, characterized in that, The contact surface between the pressure ring and the diaphragm assembly has a sharp, rounded corner.

3. The pressure sensing structure according to claim 1, wherein The diaphragm assembly includes a diaphragm body and a push rod, which is fixed to the diaphragm body by welding.

4. The pressure sensing structure according to claim 3, wherein The hardness of the diaphragm body is lower than that of the seat cover.

5. The pressure sensing structure according to claim 3, wherein The hardness of the diaphragm body is lower than that of the pressure ring.

6. The pressure sensing structure according to claim 3, wherein The upper end of the seat cover is provided with a step, and the diaphragm assembly is placed on the step surface and tightened and fixed by a pressure ring.

7. The pressure sensing structure according to claim 2, wherein The pointed corner is a radius of 0.5.

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