Flame burnthrough resistant structure of pressure balance valve
By designing a flame-resistant burn-through structure including a protective cover and a vent hole layout, the problem of insufficient burn-through ability of the existing pressure balance valve under the action of flame is solved, and higher flame-resistant burn-through ability and flight safety guarantee are achieved.
Patent Information
- Application Number
- CN202421511624.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-06-28
AI Technical Summary
The existing pressure balance valves lack the ability to burn through under the action of flame, and cannot effectively prevent the rapid spread of fire from one cabin to another.
设计了一种包括阀体、阀板、保护罩和固定板的抗火焰烧穿结构,通过调整保护罩上的通气孔布局和大小,减少火焰直接接触阀板的面积,同时保持气体流通能力。
It improves the anti-flame burn-through ability of the pressure balance valve, can resist flames and prevent burn-through within 5 minutes, ensuring flight safety.
Smart Images
Figure CN222864252U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pressure balancing valves, more specifically to a flame-proof burning-through structure of a pressure balancing valve. Background Art
[0002] The pressure balance valve is installed in the cargo hold of the aircraft to balance the pressure between the cargo hold and the triangular area to prevent damage to the fuselage structure. Another important function of the pressure balance valve is fire prevention, that is, after a fire in the cargo hold, under the action of the flame, the product cannot be burned through within 5 minutes to prevent the fire from spreading quickly from one compartment to another.
[0003] All aircraft have pressure balancing valves to adaptively balance the pressure between cabins. Figure 7 As shown, this structure failed the burn-through test.
[0004] Therefore, in order to improve the product's ability to resist flame burn-through, it is necessary to develop a pressure balance valve anti-flame burn-through structure. Utility Model Content
[0005] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and provide a pressure balance valve anti-flame burn-through structure.
[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a pressure balance valve flame-proof structure, characterized in that it includes a valve body, a valve plate located in the valve body, a protective cover located at the back of the valve body, and a fixing plate located at the front of the valve body;
[0007] The protective cover is provided with a first vent hole, a second vent hole and a third vent hole at intervals. A fourth vent hole is provided below the first vent hole and the second vent hole, and a fifth vent hole is provided above the second vent hole and the third vent hole.
[0008] In the above technical solution, the protective cover is connected to the skin on the back side of the valve body through screws and nuts.
[0009] In the above technical solution, an extension plate is provided at one end of the front side of the fixing plate, wing plates are provided on both sides of the back side of the fixing plate, and the valve body is located between the two wing plates.
[0010] Compared with the prior art, the utility model has the following advantages:
[0011] 1) The utility model improves the flame-burning resistance of the product by reducing the area of the flame directly contacting the valve plate; and adjusts the size of the vent hole so that the original gas flow area is not affected.
[0012] 2) The utility model provides a guarantee for flight safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the utility model.
[0014] Figure 2 It is a side view of the utility model.
[0015] Figure 3 for Figure 2 Enlarged view of point A in the middle.
[0016] Figure 4 It is a bottom view of the utility model.
[0017] Figure 5 It is a structural schematic diagram of the valve body and valve plate.
[0018] Figure 6 Schematic diagram of the structure of the valve body, valve plate and wing plate
[0019] Figure 7 It is a bottom view of the prior art.
[0020] Among them, 1-valve body, 2-valve plate, 3-protective cover, 31-first air vent, 32-second air vent, 33-third air vent, 34-fourth air vent, 35-fifth air vent, 4-fixing plate, 41-extension plate, 42-wing plate, 51-screw, 52-nut, 6-skin. DETAILED DESCRIPTION
[0021] The following is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but they do not constitute a limitation of the utility model and are only used as examples. At the same time, the advantages of the utility model will become clearer and easier to understand through the description.
[0022] Referring to the attached drawings, it can be seen that the pressure balance valve flame-proof structure is characterized by comprising a valve body 1, a valve plate 2 located in the valve body 1, a protective cover 3 located at the back of the valve body 1, and a fixing plate 4 located at the front of the valve body 1;
[0023] The protective cover 3 is provided with a first vent hole 31, a second vent hole 32 and a third vent hole 33 at intervals. A fourth vent hole 34 is provided below the first vent hole 31 and the second vent hole 32, and a fifth vent hole 35 is provided above the second vent hole 32 and the third vent hole 33.
[0024] The protective cover 3 is connected to the cover 6 on the back side of the valve body 1 via screws 51 and nuts 52 .
[0025] An extension plate 41 is disposed at one end of the front side of the fixing plate 4 , and wing plates 42 are disposed on both sides of the back side of the fixing plate 4 , and the valve body 1 is located between the two wing plates 42 .
[0026] In actual use, the product is fixed on the aircraft frame through the fixing plate 4.
[0027] The material of the protective cover 3 of the utility model is stainless steel or high temperature alloy.
[0028] In the utility model, when viewed from an upward angle, the ventilation holes of the protective cover are unevenly distributed, thereby reducing the area of the flame directly contacting the valve plate, and adjusting the size of the ventilation holes so that the flow capacity of the product gas is not affected.
[0029] The flame burn-through resistance test involved in this utility model comes from the CCAR25 transport aircraft airworthiness standard. It is an important test for the airworthiness certification of this product aircraft and also a key point in the design. The specific contents of the test are as follows:
[0030] Verify in accordance with Part III of Appendix F of CCAR-25-R3 “Test Method for Determining the Flame Penetration Resistance of Cargo Hold Linings”: Within 5 minutes after the application of flame, no specimen shall be burned through, and the peak temperature measured at 102 mm (4 inches) above the upper surface of the horizontal specimen shall not exceed 203°C (400°F).
[0031] In the flame burn-through resistance test, the existing product was found to be unqualified after the test, while the utility model was found to be qualified after the test.
[0032] In summary, the utility model improves the flame-burning resistance of the product without affecting the original gas flow area.
[0033] Other parts not described belong to the prior art.
Claims
1. The pressure balance valve has a flame-resistant structure, which is characterized by: It comprises a valve body (1), a valve plate (2) located inside the valve body (1), a protective cover (3) located at the back of the valve body (1), and a fixing plate (4) located at the front of the valve body (1); The protective cover (3) is provided with a first vent hole (31), a second vent hole (32) and a third vent hole (33) at intervals; a fourth vent hole (34) is provided below the first vent hole (31) and the second vent hole (32) on the protective cover (3); and a fifth vent hole (35) is provided above the second vent hole (32) and the third vent hole (33).
2. The flame-proof structure of the pressure balance valve according to claim 1 is characterized in that: The protective cover (3) is connected to the skin (6) on the back side of the valve body (1) via screws (51) and nuts (52).
3. The flame-proof structure of the pressure balance valve according to claim 2 is characterized in that: An extension plate (41) is provided at one end of the front face of the fixing plate (4), wing plates (42) are provided on both sides of the back face of the fixing plate (4), and the valve body (1) is located between the two wing plates (42).