Limiting structure of emergency ventilation valve

Abstract

The utility model discloses an emergency ventilation valve limiting structure, and relates to the technical field of emergency ventilation valves. The transmission mechanism is in gear transmission with a valve plate of the valve shell, the limiting structure comprises a limiting block, one end of the limiting block is in contact with the valve plate for limiting, and the other end of the limiting block is connected with the valve shell through a bolt. Due to the fact that the electric mechanism can only provide acting force on one side at the same time, the limiting block can provide acting force on the other side, and it is ensured that the valve plate can be stably located at the opening position or the closing position.

Description

Technical Field

[0001] The utility model relates to the technical field of emergency ventilation valves, and more specifically to a position limiting structure of emergency ventilation valves. Background Art

[0002] The emergency ventilation valve is installed on the aircraft skin. According to the instructions of the controller, it opens in an emergency state to guide the ram air along the pipeline into the interior of the aircraft's environmental control system. All aircraft need to be installed with emergency ventilation valves to meet the working needs of the environmental control system that requires a cold air source.

[0003] At present, similar products abroad are shown in Figure 8, which is the emergency ventilation valve of the Il-76 large aircraft. This structure has defects in actual use: the valve plate is not closed tightly, there is a transmission mechanism from the electric mechanism to the valve plate, and the transmission mechanism is a gear transmission. In theory, it is impossible to completely eliminate the gap.

[0004] A valve panel that is not closed tightly will affect the maintenance's judgment of whether the valve panel is in a faulty or normal state. At the same time, if the valve panel is not fully restrained for a long time, it will repeatedly impact the transmission mechanism and cause wear. Over time, tiny movements will turn into real faults, affecting flight safety.

[0005] Therefore, a kind of emergency ventilation valve limiting structure which can ensure that the valve plate can be stably in the open position or the closed position is developed. Summary of the invention

[0006] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and to provide an emergency ventilation valve limiting structure.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: an emergency ventilation valve limiting structure, including an electric mechanism, a transmission mechanism connected to the electric mechanism, and a valve housing, wherein the transmission mechanism and the valve plate of the valve housing are gear-driven, and the characteristics are:

[0008] It also includes a limiting structure, which includes a limiting block located on the inner side of the flow channel of the valve housing, one end of the limiting block contacts the valve plate for limiting position, and the other end is connected to the valve housing through bolts.

[0009] In the above technical solution, the limit block includes a connecting section connected to the valve housing and a limit section contacting and limiting the valve plate, and a step is provided between the connecting section and the limit section, and the step faces the inner side of the flow channel of the valve housing.

[0010] In the above technical solution, the direction of the limit block is adjusted according to the opening requirement of the valve plate.

[0011] In the above technical solution, nuts are provided at both ends of the bolt; gaskets are provided between the nut and the valve housing and between the nut and the limit block.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1) Since the electric mechanism can only provide a force on one side at the same time, the limit block of the utility model can provide a force on the other side to ensure that the valve plate can be stably in the open position or the closed position.

[0014] 2) The limit structure of the utility model is simple in structure, but it has greatly improved the flight safety and reliability.

[0015] 3) The direction of the limit block of the utility model is variable and can be adjusted according to the opening requirements of the valve plate to ensure that the valve plate can be stably in the open position or the closed position, with high flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an exploded view of the utility model.

[0017] Figure 2 It is a structural schematic diagram of the limiting structure.

[0018] Figure 3 It is a structural schematic diagram of the utility model.

[0019] Figure 4 It is a structural schematic diagram of the valve plate and the limiting structure when the valve plate is stably in the closed position.

[0020] Figure 5 for Figure 4 Cross-sectional view at AA in the middle.

[0021] Figure 6 It is a structural diagram of the valve plate and the limiting structure when the door plate is stably in the open position.

[0022] Figure 7 for Figure 6 Cross-sectional view at BB in the middle.

[0023] Figure 8 It is a structural schematic diagram of the prior art.

[0024] Among them, 1-electric mechanism, 2-transmission mechanism, 3-valve housing, 31-valve plate, 32-valve outlet, 33-valve inlet, 4-limiting structure, 41-limiting block, 411-connecting section, 412-limiting section, 413-step, 42-bolt, 421-nut, 422-gasket, 5-spring. DETAILED DESCRIPTION

[0025] 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.

[0026] Referring to the attached drawings, it can be seen that the emergency ventilation valve limiting structure includes an electric mechanism 1, a transmission mechanism 2 connected to the electric mechanism 1, and a valve housing 3. The transmission mechanism 2 is gear-driven with a valve plate 31 of the valve housing 3, and is characterized in that:

[0027] It also includes a limiting structure 4, which includes a limiting block 41 located on the inner side of the flow channel of the valve housing 3, one end of the limiting block 41 contacts the valve plate 31 for limiting, and the other end is connected to the valve housing 3 through a bolt 42; there is a through hole on the valve housing 3, and the position of the through hole can be adjusted according to the opening requirement of the valve plate 31 to ensure that the electric mechanism 1 provides a force on one side and the limiting block 41 provides a force on the other side, so that the valve plate 31 can be stably in the open position or the closed position.

[0028] The limiting block 41 includes a connecting section 411 connected to the valve housing 3 and a limiting section 412 contacting and limiting the valve plate 31 . A step 413 is provided between the connecting section 411 and the limiting section 412 , and the step 413 faces the inner side of the flow channel of the valve housing 3 .

[0029] The direction of the limit block 41 is adjusted according to the opening requirement of the valve plate 31 .

[0030] Nuts 421 are disposed at both ends of the bolt 42 ; gaskets 422 are disposed between the nut 421 and the valve housing 3 , and between the nut 421 and the limiting block 41 .

[0031] like Figure 4 As shown, the method of adding a spring in the transmission mechanism 2 to apply the preload force is commonly used at home and abroad, but the spring force is not stable and difficult to install.

[0032] The limit block 41 of the utility model is installed on the inner side of the flow channel of the valve housing 3 and is fixed by bolts 42, washers 422 and nuts 421. The bolts 42, washers 421 and nuts 422 are all standard parts; the direction of the limit block 41 is variable and can be adjusted according to the opening requirements of the valve plate 31.

[0033] Other parts not described belong to the prior art.

Claims

1. An emergency ventilation valve limiting structure, comprising an electric mechanism (1), a transmission mechanism (2) connected to the electric mechanism (1), and a valve housing (3), wherein the transmission mechanism (2) and a valve plate (31) of the valve housing (3) are gear-driven, and characterized in that: It also includes a limiting structure (4), the limiting structure (4) including a limiting block (41) located inside the flow channel of the valve housing (3), one end of the limiting block (41) contacts the valve plate (31) for limiting, and the other end is connected to the valve housing (3) via a bolt (42).

2. The emergency ventilation valve limiting structure according to claim 1 is characterized in that: The limit block (41) comprises a connecting section (411) connected to the valve housing (3) and a limit section (412) contacting and limiting the valve plate (31), a step (413) being provided between the connecting section (411) and the limit section (412), the step (413) facing the inner side of the flow channel of the valve housing (3).

3. The emergency ventilation valve limiting structure according to claim 1 is characterized in that: The orientation of the limit block (41) is adjusted according to the opening requirement of the valve plate (31).

4. The emergency ventilation valve limiting structure according to claim 1 is characterized in that: Nuts (421) are provided at both ends of the bolt (42); gaskets (422) are provided between the nut (421) and the valve housing (3), and between the nut (421) and the limiting block (41).

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