Normal-pressure liquid fuel tank valve

Abstract

The utility model discloses a normal pressure liquid fuel tank valve, which is matched with a normal pressure tank for use, and comprises a valve body, a valve rod is arranged in the valve body, a pressing cap is arranged at the upper end of the valve body, a hand wheel is arranged at the upper end of the pressing cap, a hexagonal flange nut is arranged in the middle of the hand wheel, and the hexagonal flange nut is arranged in the middle of the valve body. A first valve assembly is installed at the lower end of the valve rod, a liquid phase opening is formed in one side of the valve body, a gas phase opening is formed in the lower end of the valve body, the liquid phase opening, the gas phase opening and the valve body are integrally formed in a casting mode, a self-closing mechanism is arranged in the liquid phase opening, a second valve assembly is installed in the gas phase opening, and the self-closing mechanism is connected with the self-closing mechanism. A pressure relief spring is installed outside the second valve assembly, a pressure adjusting screw plug is installed at one end of the gas phase opening, and the pressure adjusting screw plug is connected with the gas phase opening through threads, so that leakage when a pipeline falls off is avoided, and negative pressure is prevented from being generated in the tank body in the using process.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a normal pressure liquid fuel tank valve. Background Art

[0002] Normal pressure liquid fuel tank valve is a key equipment, widely used in various liquid fuel storage and distribution systems. Valves play a vital role in these systems to ensure the safe storage, accurate metering and effective delivery of fuel. Normal pressure liquid fuel tank valve is mainly used to control the inlet and outlet flow of liquid fuel, prevent fuel leakage and excessive overflow, and ensure the safe operation of the system. The valve is usually composed of valve body, valve cover, valve seat, valve disc, actuator and other components. Its working principle is to change the on-off state of the flow channel by rotating or lifting the valve disc, thereby achieving control of the fluid.

[0003] The Chinese patent announcement number is CN206130105U, and the authorization announcement date is April 26, 2017. A drain valve mechanism includes a valve body, a hollow valve cavity is formed in the valve body, the two ends of the valve cavity are respectively an inlet and an outlet, a valve hole is provided at the outlet of the valve cavity, a valve core is provided in the valve cavity, the core cone of the valve core can float, the core seat of the valve core is clamped on the inner wall of the valve cavity, and an extension spring and a contraction spring made of shape memory alloy are connected between the core seat and the core cone. After power is turned on, the extension spring and the contraction spring heat up and change phases, and the extension spring and the contraction spring control the up and down movement of the core cone, thereby controlling the opening and closing of the valve mechanism, and the structure is simple, which is very convenient for the disassembly and assembly of the valve core. This patent is intended to provide a drain valve mechanism to simply and conveniently control the flow of fluid and facilitate the disassembly and assembly of the valve core.

[0004] Although the above-mentioned prior art can be applied to fuel tanks, in actual use, on the one hand, excessive delivery pressure will cause the gas phase tube to fall off, causing fuel leakage; on the other hand, when the internal pressure of the fuel tank is too low, negative pressure problems are prone to occur. Therefore, it does not meet the existing needs. In this regard, we propose a normal pressure liquid fuel tank valve. Utility Model Content

[0005] The utility model aims to provide a normal pressure liquid fuel tank valve to solve the problems of leakage when the pipeline is easily detached and negative pressure generated in the tank body during use proposed in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a normal pressure liquid fuel tank valve, comprising a valve body, a valve stem is arranged inside the valve body, a pressure cap is installed on the upper end of the valve body, a hand wheel is installed on the upper end of the pressure cap, a hexagonal flange nut is installed at the middle position of the hand wheel, the outer part of the hexagonal flange nut is fixed to the hand wheel, and the hexagonal flange nut is matched with the upper end of the valve stem through a thread, a first valve assembly is installed on the lower end of the valve stem, a liquid phase port is arranged on one side of the valve body, a gas phase port is arranged on the lower end of the valve body, and the liquid phase port, the gas phase port and the valve body are integrally cast, a self-closing mechanism is arranged inside the liquid phase port, a second valve assembly is installed inside the gas phase port, a pressure relief spring is installed on the outer side of the second valve assembly, a pressure regulating screw plug is installed at one end of the gas phase port, and the pressure regulating screw plug is connected to the gas phase port through a thread.

[0007] Preferably, a first spring is installed between the bottom of the hexagonal flange nut and the upper end of the valve stem.

[0008] Preferably, the self-closing mechanism includes a movable component, and the movable component and the liquid phase port are slidingly limited, the outer ring inside the movable component is provided with four to six first through holes distributed in an annular shape, a conical part is provided at the middle position of one side of the movable component, and the conical part and the movable component are integrally formed, a fixed component is provided on one side of the conical part, and the fixed component is fixed to the liquid phase port, a second through hole is provided at the middle position of the fixed component, a second spring is installed on the outside of the conical part, and both ends of the second spring are respectively fixed to the movable component and the fixed component.

[0009] Preferably, a gasket is provided between the bottom of the hand wheel and the pressure cap.

[0010] Preferably, a sealing gasket is provided at the bottom of the pressure cap, and the sealing gasket is in contact with the valve body and the valve stem respectively.

[0011] Preferably, an O-ring is provided at a middle position inside the pressure cap, and an inner wall of the O-ring is in contact with the valve stem.

[0012] Preferably, the diameter of the second through hole is larger than that of the first through hole.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model is suitable for the opening and closing device of fuel liquid, and can work stably under high pressure and high temperature difference. By turning the hand wheel counterclockwise, the hexagonal flange nut is driven to rotate. Under the friction between its internal thread and the thread on the upper end of the valve stem, the rotational motion is converted into linear motion, thereby driving the first valve assembly to rise, realizing the connection between the liquid phase port and the gas phase port, thereby transporting the fuel liquid. The pressure maintaining performance of the mechanism is stable, and the sealing and anti-deformation performance can be guaranteed.

[0015] 2. The utility model provides a self-closing mechanism in the liquid phase port. When the valve is in the open state, the cone is impacted by the pressure of the tank body. As the pressure continues to increase, the movable component is displaced by the cone. At this time, the fuel can pass through the first through hole inside the movable component from the second through hole, and then enter the valve body, and then enter the pipeline from the gas phase port at one end of the valve body to realize the transportation of the fuel. When the valve is closed or the tank pressure is reduced, the pressure on the cone is relatively small. At this time, under the action of the second spring, the movable component moves toward the fixed component, and the cone enters the inside of the second through hole again, forming a seal on the second through hole, realizing the self-closing function. This structure can prevent the tank from generating negative pressure during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a front view of the valve body of the utility model;

[0018] Figure 3 It is a side view of the valve body of the utility model;

[0019] Figure 4 This is a bottom view of the valve body of the utility model;

[0020] Figure 5 It is a three-dimensional diagram of the self-closing mechanism of the utility model.

[0021] In the figure: 1. valve body; 2. hand wheel; 3. hexagonal flange nut; 4. first spring; 5. gasket; 6. pressure cap; 7. valve stem; 8. first valve assembly; 9. sealing gasket; 10. O-ring; 11. liquid phase port; 12. movable component; 13. conical member; 14. fixed component; 15. gas phase port; 16. second spring; 17. first through hole; 18. second through hole; 19. second valve assembly; 20. pressure relief spring; 21. pressure regulating plug. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] See also Figure 1-5 The utility model provides an embodiment: a normal pressure liquid fuel tank valve, comprising a valve body 1, a valve stem 7 is arranged inside the valve body 1, a pressure cap 6 is installed on the upper end of the valve body 1, a hand wheel 2 is installed on the upper end of the pressure cap 6, a hexagonal flange nut 3 is installed at the middle position of the hand wheel 2, the outer part of the hexagonal flange nut 3 is fixed to the hand wheel 2, and the hexagonal flange nut 3 is threadedly matched with the upper end of the valve stem 7, a first valve assembly 8 is installed on the lower end of the valve stem 7, a liquid phase port 11 is arranged on one side of the valve body 1, a gas phase port 15 is arranged on the lower end of the valve body 1, and the liquid phase port 11, the gas phase port 15 and the valve body 1 are integrally cast, a self-closing mechanism is arranged inside the liquid phase port 11, a second valve assembly 19 is installed inside the gas phase port 15, and the second valve assembly 19 A pressure relief spring 20 is installed on the outside, a pressure regulating plug 21 is installed on one end of the gas phase port 15, and the pressure regulating plug 21 is connected to the gas phase port 15 by threads. The valve assembly usually includes one or more valves, which are opened or closed under specific conditions to control the flow of fuel. When the pressure or liquid level in the fuel tank reaches a preset value, the valve in the valve assembly will open or close according to the changes in these conditions, thereby regulating the inflow and outflow of fuel. The main function of the pressure relief spring is to push the valve to open through its elastic effect when the pressure inside the valve body is too high, thereby releasing excessive pressure. The pressure regulating plug is used to adjust the pressure inside the valve body. By rotating the plug, the size or position of the channel inside it can be changed, thereby controlling the flow rate of the fuel.

[0024] When in use, the hand wheel 2 is turned counterclockwise to drive the hexagonal flange nut 3 to rotate. Under the friction between its internal thread and the thread on the upper end of the valve stem 7, the rotational motion is converted into linear motion, thereby driving the first valve assembly 8 to rise, realizing the connection between the liquid phase port 11 and the gas phase port 15, thereby delivering the fuel liquid.

[0025] See also Figure 1 A first spring 4 is installed between the bottom of the hexagonal flange nut 3 and the upper end of the valve stem 7, and the elastic support can ensure the tightening effect of the hexagonal flange nut 3 on the valve stem 7 after the adjustment of the threads.

[0026] See also Figure 1 and Figure 5The self-closing mechanism includes a movable component 12, and the movable component 12 and the liquid phase port 11 are slidably limited. The outer ring inside the movable component 12 is provided with four to six first through holes 17 distributed in an annular shape. A conical member 13 is provided at the middle position of one side of the movable component 12, and the conical member 13 and the movable component 12 are integrally formed. A fixed component 14 is provided on one side of the conical member 13, and the fixed component 14 is fixed to the liquid phase port 11. A second through hole 18 is provided at the middle position of the fixed component 14. A second spring 16 is installed on the outside of the conical member 13, and the two ends of the second spring 16 are respectively fixed to the movable component 12 and the fixed component 14, so as to realize the self-closing function. This structure can prevent the tank from generating negative pressure during use.

[0027] See also Figure 1 A gasket 5 is provided between the bottom of the hand wheel 2 and the pressure cap 6 to ensure the tightness of the contact between the hand wheel 2, the valve body 1 and the pressure cap 6 to prevent leakage of the medium.

[0028] See also Figure 1 A sealing gasket 9 is provided at the bottom of the pressure cap 6, and the sealing gasket 9 is in contact with the valve body 1 and the valve stem 7 respectively, thereby improving the sealing performance between them.

[0029] See also Figure 1 An O-ring 10 is provided at the middle position inside the pressure cap 6, and the inner wall of the O-ring 10 is in contact with the valve stem 7, which further improves the sealing performance and prevents medium leakage.

[0030] See also Figure 5 , the diameter of the second through hole 18 is greater than that of the first through hole 17 .

[0031] Working principle: When in use, the cone 13 is impacted by the pressure of the tank when the valve is open. As the pressure continues to increase, the movable component 12 is displaced by the cone 13. At this time, the fuel can pass through the first through hole 17 inside the movable component 12 from the second through hole 18, and then enter the valve body 1, and then enter the pipeline from the gas phase port 15 at one end of the valve body 1 to realize the fuel transportation. When the valve is closed or the tank pressure is reduced, the pressure on the cone 13 is relatively small. At this time, under the action of the second spring 16, the movable component 12 moves toward the fixed component 14, allowing the cone 13 to enter the second through hole 18 again, forming a seal on the second through hole 18, realizing the self-closing function. This structure can prevent the tank from generating negative pressure during use.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A normal pressure liquid fuel tank valve, comprising a valve body (1), characterized in that: A valve stem (7) is arranged inside the valve body (1), a pressure cap (6) is installed at the upper end of the valve body (1), a hand wheel (2) is installed at the upper end of the pressure cap (6), a hexagonal flange nut (3) is installed at the middle position of the hand wheel (2), the outer part of the hexagonal flange nut (3) is fixed to the hand wheel (2), and the hexagonal flange nut (3) is threadedly matched with the upper end of the valve stem (7), a first valve assembly (8) is installed at the lower end of the valve stem (7), and a liquid phase port (11) is arranged on one side of the valve body (1). The lower end of the valve body (1) is provided with a gas phase port (15), and the liquid phase port (11), the gas phase port (15) and the valve body (1) are integrally cast, the interior of the liquid phase port (11) is provided with a self-closing mechanism, the interior of the gas phase port (15) is installed with a second valve assembly (19), the exterior of the second valve assembly (19) is installed with a pressure relief spring (20), one end of the gas phase port (15) is installed with a pressure regulating screw plug (21), and the pressure regulating screw plug (21) is connected to the gas phase port (15) by means of a thread.

2. The normal pressure liquid fuel tank valve according to claim 1, characterized in that: A first spring (4) is installed between the bottom of the hexagonal flange nut (3) and the upper end of the valve stem (7).

3. The normal pressure liquid fuel tank valve according to claim 1, characterized in that: The self-closing mechanism comprises a movable component (12), and the movable component (12) and the liquid phase port (11) are slidably limited, the outer ring inside the movable component (12) is provided with four to six first through holes (17) distributed in an annular shape, a conical part (13) is provided at the middle position of one side of the movable component (12), and the conical part (13) and the movable component (12) are integrally formed, a fixed component (14) is provided on one side of the conical part (13), and the fixed component (14) is fixed to the liquid phase port (11), a second through hole (18) is provided at the middle position of the fixed component (14), and a second spring (16) is installed on the outside of the conical part (13), and the two ends of the second spring (16) are respectively fixed to the movable component (12) and the fixed component (14).

4. The normal pressure liquid fuel tank valve according to claim 1, characterized in that: A gasket (5) is provided between the bottom of the hand wheel (2) and the pressure cap (6).

5. The normal pressure liquid fuel tank valve according to claim 1, characterized in that: A sealing gasket (9) is provided at the bottom of the pressure cap (6), and the sealing gasket (9) is in contact with the valve body (1) and the valve stem (7) respectively.

6. The normal pressure liquid fuel tank valve according to claim 1, characterized in that: An O-type sealing ring (10) is arranged at a middle position inside the pressure cap (6), and the inner wall of the O-type sealing ring (10) is in contact with the valve stem (7).

7. The normal pressure liquid fuel tank valve according to claim 3, characterized in that: The diameter of the second through hole (18) is larger than that of the first through hole (17).

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