Drain valve with cam structure

Abstract

The utility model relates to a drain valve with a cam structure. The drain valve comprises a screw cap, a locking assembly, a valve assembly, a shell assembly, a valve spring, a cam assembly, a wrench and a chain assembly. The locking assembly is arranged on the side portion of a lower opening of the cavity, the locking assembly is provided with a locking shell, a spring pin is arranged in the locking shell, a shifting piece is formed on the spring pin, and the spring pin can be popped out of the locking shell to be located at a clamping position by shifting the shifting piece; a clamping groove is formed in the upper edge face of the rotary cover, the spring pin can be pushed and pressed when the rotary cover rotates to the position close to the final position, when the spring pin is clamped into the clamping groove, the rotary cover is clamped, and the spring pin can prevent the rotary cover from loosening. A traditional threaded plug drainage structure is changed into a valve structure, and later use and maintenance are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft fuel nitrogen inerting, in particular to a cam structured liquid discharge valve. Background Art

[0002] In the aircraft fuel nitrogen inerting process, a drain valve needs to be installed between the nitrogen outlet at the end of the system and the fuel tank inlet to manually discharge the condensed water in the pipeline.

[0003] Liquid water in the system's output pipe needs to be drained through the drain valve to prevent fuel contamination. Existing drain devices are typically designed as threaded plugs, which are simple in structure. However, the drain valve requires frequent opening by ground crew members, who must first break the thread lock before unscrewing it. After opening, they must tighten it with a torque wrench and then re-lock the thread lock, causing inconvenience in use and maintenance. Utility Model Content

[0004] The purpose of the utility model is to provide a liquid discharge valve with a cam structure design, which can solve the problem of inconvenience in later use and maintenance.

[0005] The technical solution of the utility model is:

[0006] The utility model provides a cam structure liquid discharge valve, comprising: a rotary cover 1, a locking assembly 3, a valve assembly 5, a housing assembly 6, a valve spring 7, a cam assembly 8, a wrench 9 and a chain assembly 10;

[0007] The housing assembly includes a main housing and an upper cover; the main housing upper cover is fixedly connected to form a cavity with a lower opening, the valve assembly 5 and the valve spring 7 are disposed in the cavity, and the valve assembly 5 divides the cavity into an upper chamber and a lower chamber; a liquid passage is provided in the main housing corresponding to the upper chamber, and the valve assembly 5, under the action of the valve spring 7, prevents the upper and lower chambers from communicating, thereby closing the passage from the lower opening to the liquid passage; when the valve assembly is pushed to compress the valve spring 7, the upper and lower chambers can be connected, and at the same time, the passage from the lower opening to the liquid passage is opened;

[0008] The cam assembly 8 is arranged in the lower cavity, and the cam assembly 8 includes a shaft, a cam and a wrench. The shaft can rotatably pass through the housing corresponding to the lower cavity. The cam and the wrench are both fixed to the shaft and can rotate integrally with the shaft. The cam is located in the lower cavity, and the wrench is located outside the lower cavity. The cam is used to push the valve assembly to compress the valve spring 7, and the wrench is used to operate the shaft to rotate.

[0009] The lower opening of the cavity has an external thread, and the screw cap 1 has an internal thread. The screw cap 1 is threadedly matched with the lower opening of the cavity, and the lower opening of the cavity can be closed by rotating the screw cap;

[0010] The locking assembly 3 is provided on the side of the lower opening of the cavity. The locking assembly 3 comprises a locking housing. A spring pin is provided in the locking housing, and the spring pin is formed with a paddle. When the paddle is paddled, the spring pin can be ejected from the locking housing to a locked position.

[0011] A slot is formed on the upper edge of the rotary cover, which pushes a spring pin when the rotary cover rotates to a position close to the end. When the spring pin is engaged in the slot, the rotary cover is locked, and the spring pin can prevent the rotary cover from loosening.

[0012] Furthermore, the main shell and the upper cover are fixed by threaded connection.

[0013] Furthermore, the outer surface of the screw cap is provided with straight knurling to increase friction and facilitate unscrewing by maintenance personnel.

[0014] Furthermore, the cam and the shaft are fixedly connected via a pin.

[0015] Furthermore, the utility model further comprises a chain and a chain head, wherein the two chain heads are respectively mounted on the wrench and the screw cap, and the chain heads are connected by a chain. When the screw cap is unscrewed, it can fall naturally through the chain without having to find another place to store it or worry about it being lost.

[0016] Furthermore, the valve assembly and the inner surface of the main housing are clearance-fitted, leaving a suitable tolerance zone.

[0017] Furthermore, a shaft sleeve is also provided on the shaft.

[0018] In addition, the following forms or structures may also exist:

[0019] The valve spring is in contact with the valve assembly and the upper cover and is in a compressed state, providing pre-compression force for the valve assembly. The valve assembly shaft cooperates with the upper cover to improve the guiding performance, and the valve assembly seal fits the inner plane of the main shell;

[0020] The installation position passes through the center axis of the valve assembly. The shaft sleeve is sleeved on the shaft between the cam and the main housing, which plays the role of axial limit. The wrench is installed on the shaft and connected to the shaft through a pin. The internal rectangular hole shaft shape is convenient for transmitting torque. When the wrench is pressed down, the wrench drives the shaft and the shaft drives the cam to rotate. When it rotates about 90°, the wrench is blocked by the flange in the middle of the main housing and limited. At this time, the cam rotates 90° to lift the valve assembly to the maximum opening, and the valve opens.

[0021] During operation, the cam should contact the flange surface at the lower end of the valve assembly to ensure that the force point is as close as possible to the center axis of the valve assembly, and the valve assembly and the inner surface of the main shell should not generate a large tilting torque in the axial movement range to avoid valve jamming.

[0022] The working process of this utility model is as follows:

[0023] When draining, first lift the locking button upwards, then unscrew the screw cap, and then press the wrench to open the valve. The liquid water accumulated in the pipeline is discharged through the shell and the valve mouth. After being discharged, turn the wrench to close the valve, and then screw on the screw cap. When it is screwed to the end, the locking button pops out under the action of the spring and inserts into the notch reserved on the screw cap. The screw cap is locked and the working cycle ends.

[0024] The advantages of the utility model are that the traditional threaded plug drainage structure is changed into a valve structure, which is convenient for later use and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the cam structure discharge valve;

[0026] Figure 2 This is a cross-sectional view of the drain valve product;

[0027] Figure 3 It is a structural diagram of the cam assembly;

[0028] Figure 4 is a structural diagram of the locking assembly;

[0029] Figure 5 It is a schematic diagram of the flow of liquid inside the drain valve;

[0030] Among them: 1-screw cover, 2-shaft sleeve, 3-locking assembly, 4-pin, 5-valve assembly, 6-housing assembly, 7-valve spring, 8-cam assembly, 9-wrench, 10-chain assembly, locking housing 31, spring pin 32, and paddle 33. DETAILED DESCRIPTION

[0031] The disclosed examples will be described more fully with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. In fact, many different examples can be described and these examples should not be construed as limited to the examples set forth herein. Instead, these examples are described so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those skilled in the art.

[0032] The utility model provides a liquid discharge valve with a cam structure design, comprising: a rotary cover 1, a locking assembly 3, a valve assembly 5, a housing assembly 6, a valve spring 7, a cam assembly 8, a wrench 9 and a chain assembly 10;

[0033] The housing assembly includes a main housing and an upper cover; the main housing upper cover is fixedly connected to form a cavity with a lower opening, the valve assembly 5 and the valve spring 7 are disposed in the cavity, and the valve assembly 5 divides the cavity into an upper chamber and a lower chamber; a liquid passage is provided in the main housing corresponding to the upper chamber, and the valve assembly 5, under the action of the valve spring 7, prevents the upper and lower chambers from communicating, thereby closing the passage from the lower opening to the liquid passage; when the valve assembly is pushed to compress the valve spring 7, the upper and lower chambers can be connected, and at the same time, the passage from the lower opening to the liquid passage is opened;

[0034] The cam assembly 8 is arranged in the lower cavity, and the cam assembly 8 includes a shaft, a cam and a wrench. The shaft can rotatably pass through the housing corresponding to the lower cavity. The cam and the wrench are both fixed to the shaft and can rotate integrally with the shaft. The cam is located in the lower cavity, and the wrench is located outside the lower cavity. The cam is used to push the valve assembly to compress the valve spring 7, and the wrench is used to operate the shaft to rotate.

[0035] The lower opening of the cavity has an external thread, and the screw cap 1 has an internal thread. The screw cap 1 is threadedly matched with the lower opening of the cavity, and the lower opening of the cavity can be closed by rotating the screw cap;

[0036] The locking assembly 3 is provided on the side of the lower opening of the cavity. The locking assembly 3 comprises a locking housing. A spring pin is provided in the locking housing, and the spring pin is formed with a paddle. When the paddle is paddled, the spring pin can be ejected from the locking housing to a locked position.

[0037] A slot is formed on the upper edge of the rotary cover, which pushes a spring pin when the rotary cover rotates to a position close to the end. When the spring pin is engaged in the slot, the rotary cover is locked, and the spring pin can prevent the rotary cover from loosening.

[0038] The main shell and the upper cover are fixed by threaded connection.

[0039] The outer surface of the screw cap is provided with straight knurling to increase friction and make it easier for maintenance personnel to unscrew it.

[0040] The cam is fixedly connected to the shaft via a pin.

[0041] It also includes a chain and a chain head, with the two chain heads mounted on the wrench and the screw cap respectively, and the chain heads are connected by a chain. When the screw cap is unscrewed, it can fall naturally through the chain, without having to find a place to store it or worry about it being lost.

[0042] There is a clearance fit between the valve assembly and the inner surface of the main housing, leaving a suitable tolerance zone.

[0043] The description of various advantageous arrangements has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the examples disclosed. Many modifications and variations will be apparent to those skilled in the art. In addition, different advantageous examples may describe different advantages compared to other advantageous examples. The selected example or examples are chosen and described to best illustrate the principles of the examples, their practical application, and to enable those skilled in the art to understand the disclosure with various examples with various modifications suitable for the particular use contemplated.

Claims

1. A cam structure liquid discharge valve, characterized in that: It comprises a rotary cover (1), a locking assembly (3), a valve assembly (5), a housing assembly (6), a valve spring (7), a cam assembly (8), a wrench (9) and a chain assembly (10); The housing assembly comprises a main housing and an upper cover; the main housing and the upper cover are fixedly connected to form a cavity with a lower opening, the valve assembly (5) and the valve spring (7) are arranged in the cavity, and the valve assembly (5) divides the cavity into an upper cavity and a lower cavity; the main housing corresponding to the upper cavity is provided with a liquid opening, and the valve assembly prevents the upper cavity and the lower cavity from communicating under the action of the valve spring (7), so that the passage from the lower opening to the liquid opening is closed; when the valve assembly is pushed to compress the valve spring (7), the upper cavity and the lower cavity can be communicated, and at the same time, the passage from the lower opening to the liquid opening is opened; A cam assembly (8) is arranged in the lower cavity, and the cam assembly (8) includes a shaft, a cam, and a wrench. The shaft is rotatable and passes through a housing corresponding to the lower cavity. The cam and the wrench are both fixed to the shaft and can rotate integrally with the shaft. The cam is located in the lower cavity, and the wrench is located outside the lower cavity. The cam is used to push the valve assembly to compress the valve spring (7), and the wrench is used to operate the shaft to rotate. The lower opening of the cavity has an external thread, the screw cap (1) has an internal thread, and the screw cap (1) cooperates with the thread of the lower opening of the cavity, and the lower opening of the cavity can be closed by rotating the screw cap; The locking assembly (3) is provided on the side of the lower opening of the cavity, and the locking assembly (3) has a locking housing. A spring pin is provided in the locking housing, and the spring pin is formed with a paddle. When the paddle is moved, the spring pin can be ejected from the locking housing to be located in a locked position. A slot is formed on the upper edge of the rotary cover, which pushes a spring pin when the rotary cover rotates to a position close to the end. When the spring pin is engaged in the slot, the rotary cover is locked, and the spring pin can prevent the rotary cover from loosening.

2. The cam structure liquid discharge valve according to claim 1, characterized in that: The main shell and the upper cover are fixed by threaded connection.

3. The cam structure liquid discharge valve according to claim 1, characterized in that: The outer surface of the screw cap is provided with straight knurling.

4. The cam structure liquid discharge valve according to claim 1, characterized in that: The cam is fixedly connected to the shaft via a pin.

5. The cam structure liquid discharge valve according to claim 1, characterized in that: The utility model also comprises a chain and a chain head. The two chain heads are respectively mounted on the wrench and the screw cap, and the chain heads are connected by a chain.

6. The cam structure liquid discharge valve according to claim 1, characterized in that: There is a clearance fit between the valve assembly and the inner surface of the main shell.

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