Negative pressure cutoff structure and valve

Abstract

The negative pressure cutoff structure comprises an opening and closing piston, a first through hole is formed in the end of the opening and closing piston in the axial direction, and one or more second through holes formed in the radial direction are formed in the circumferential wall of the opening and closing piston; the sealing ring is sleeved on the periphery of the opening and closing piston; the free end of the telescopic part can extend into the opening and closing piston, so that the first through hole and the second through hole are communicated or disconnected; when the first through hole and the second through hole are in a communicated state, the opening and closing piston is pushed by media along with the sealing ring and moves towards the side, away from the medium channel, of the valve body, so that the inlet end and the outlet end of the valve body are communicated. The purpose of closing or opening the valve can be achieved only by changing the pressure direction of the fluid, and extra cutoff power does not need to be provided externally.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a negative pressure flow interruption structure and valve. Background Technology

[0002] Liquid fuels are widely used in the gas industry due to their lower economic costs. Patented steel tanks are required when filling liquid fuels such as liquefied petroleum gas (LPG). These steel tanks are equipped with valves suitable for liquid fuel media.

[0003] In existing technologies, to prevent leaks during fuel filling from going undetected and posing a safety hazard, a dedicated ball valve with an alarm and sensor is installed at the material inlet of the valve. Once a gas leak is detected, the sensor sends a signal back to the ball valve and issues an alarm. The built-in motor of the ball valve can automatically or be remotely controlled to move the built-in plug, causing the pipeline to disconnect. However, since the ball valve takes 6-8 seconds or even longer to open or close, the closing speed is too slow. In addition, the ball valve with alarm function has a relatively complex structure, and its power source is an internally installed motor, which is also expensive. Utility Model Content

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] Negative pressure flow interruption structure and valve, including:

[0006] An opening and closing piston has a first through hole axially opened at its end, and one or more second through holes radially opened on the peripheral wall of the opening and closing piston.

[0007] A sealing ring is fitted around the outer periphery of the opening and closing piston;

[0008] The telescopic part has a free end that can extend into the opening and closing piston to connect or disconnect the first through hole and the second through hole.

[0009] When the first through hole and the second through hole are in a connected state, the opening and closing piston is pushed by the medium along with the sealing ring and moves toward the medium passage away from the valve body, so that the inlet end and outlet end of the valve body are connected:

[0010] When the first through hole and the second through hole are disconnected, the opening and closing piston moves along the medium channel side near the valve body under the negative pressure formed on the outside, so as to disconnect the inlet and outlet of the valve body.

[0011] Furthermore, the diameters of the first through hole and the second through hole are not equal.

[0012] Furthermore, the diameter of the first through hole is greater than the sum of the diameters of one or more second through holes.

[0013] Furthermore, the sealing ring has a Y-shaped cross-section, and the opening and closing piston has an annular groove on its circumference for installing the sealing ring.

[0014] Furthermore, a piston pad is provided at the end of the opening and closing piston.

[0015] Furthermore, the telescopic part includes an iron core rod, an iron core guide sleeve sleeved around the outer periphery of the iron core rod, and a coil component.

[0016] Furthermore, the iron core guide sleeve has a third through hole distributed circumferentially, and a compression spring and a steel ball acting on the outer periphery of the iron core rod are provided in the third through hole.

[0017] Furthermore, this application also discloses a valve, which includes a valve body and the aforementioned negative pressure interruption structure, wherein the valve body is provided with a cavity for installing the negative pressure interruption structure, and the valve body is provided with a flow guiding channel, with the inlet end connected to the cavity via the flow guiding channel.

[0018] Furthermore, a handwheel is provided on the valve body, and a self-closing component is provided at the outlet end of the valve body.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] By installing this flow-stopping structure inside the valve body, the pressure generated by the internal fluid itself can be used to close or open the valve simply by changing the direction of the fluid pressure, without the need for additional external flow-stopping power.

[0021] This solution uses an opening and closing piston installed inside the valve body. The opening and closing piston has a first through hole and a second through hole. When fluid enters the through holes, a flow velocity and pressure difference are generated between them. The opening and closing piston is activated by the pressure of the medium itself. The closing is quick and reliable, and the sealing effect is good. Since this flow-cutting structure is set inside the valve body, it forms a whole and the structure is more compact. At the same time, there is no need to install other auxiliary ball valves and motors, which also ensures good economy. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the valve in an embodiment of this utility model;

[0023] Figure 2 This is a cross-sectional view of the valve in an embodiment of the present utility model;

[0024] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0025] Figure 4 This is a cross-sectional view of the valve after the negative pressure flow interruption structure has been removed in an embodiment of this utility model.

[0026] Figure 5 This is a three-dimensional structural diagram of the negative pressure interruption structure in an embodiment of the present invention (view 1);

[0027] Figure 6 This is a three-dimensional structural diagram of the negative pressure interruption structure in an embodiment of this utility model (viewpoint two);

[0028] Figure 7 This is a schematic diagram of the main structure of the negative pressure interruption structure in an embodiment of this utility model;

[0029] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure of AA;

[0030] Figure 9 This is an exploded structural diagram of the negative pressure flow interruption structure in an embodiment of this utility model (viewpoint 1);

[0031] Figure 10 This is a schematic diagram of the exploded structure of the negative pressure flow interruption structure in an embodiment of this utility model (perspective 2);

[0032] Figure 11 This is a three-dimensional structural diagram of the opening and closing piston in an embodiment of the present utility model (view 1);

[0033] Figure 12 This is a three-dimensional structural diagram of the opening and closing piston in an embodiment of the present utility model (view 2);

[0034] The reference numerals in the accompanying drawings include:

[0035] 1. Opening and closing piston, 10. First through hole, 11. Second through hole, 12. Annular groove, 13. Piston pad, 14. Sealing ring, 2. Telescopic part, 20. Iron core rod, 21. Iron core guide sleeve, 21. Third through hole, 210. Compression spring, 211. Steel ball, 212. Coil component, 22. Valve body, 30. Cavity, 31. Guide channel, 32. Handwheel, 33. Inlet, 34. Outlet, 4. Self-closing assembly. Detailed Implementation

[0036] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] The accompanying drawings are for illustrative purposes only and represent schematic diagrams, not actual physical objects. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The same or similar reference numerals in the drawings of the embodiments of this utility model correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" appear, indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0038] like Figure 1 - Figure 12 As shown, the negative pressure flow interruption structure and valve of this utility model include:

[0039] The piston 1 for opening and closing has a first through hole 10 axially opened at its end, and one or more second through holes 11 radially opened on its peripheral wall.

[0040] Sealing ring 14 is fitted around the outer periphery of the opening and closing piston 1;

[0041] The telescopic part 2 has a free end that can extend into the opening and closing piston 1 so that the first through hole 10 and the second through hole 11 can be connected or disconnected.

[0042] When the first through hole 10 and the second through hole 11 are in a connected state, the opening and closing piston 1 is pushed by the medium along with the sealing ring 14 and moves toward the medium channel side away from the valve body 3 so that the liquid inlet end of the valve body 3 is connected to the outlet end 34.

[0043] When the first through hole 10 and the second through hole 11 are disconnected, the opening and closing piston 1 moves along the medium channel side near the valve body 3 under the negative pressure formed on the outside, so as to disconnect the inlet end 33 and the outlet end 34 of the valve body 3.

[0044] As a necessary condition for the formation of negative pressure, the diameter of the first through hole 10 is greater than the sum of the diameters of one or more second through holes 11.

[0045] In the actual machining of parts, the diameter of the first through hole 10 is no greater than 2mm, and the diameter of the second through hole 11 is no greater than 0.5mm.

[0046] The sealing ring 14 has a Y-shaped cross-section, and the opening and closing piston has an annular groove 12 for installing the sealing ring 14.

[0047] The opening and closing piston 1 is provided with a piston pad 13 at its end. The piston pad 13 provides better protection for the flow interruption and sealing of the opening and closing piston 1.

[0048] The telescopic part 2 in this technical solution can take many forms, such as screw, cylinder and other structures. In this embodiment, magnetic drive is used to drive the corresponding parts to move with a small force or to act directly on the opening and closing piston 1, so that the first through hole 10 and the second through hole 11 are connected or disconnected, forming a negative pressure, so that the opening and closing piston 1 moves and controls the opening and closing of the medium.

[0049] Specifically, in this embodiment, the telescopic part 2 includes an iron core rod 20, an iron core guide sleeve 21 sleeved around the outer periphery of the iron core rod 20, and a coil component 22. The telescopic part 2 serves as a control component, and its coil component 22 consists of a copper coil, a coil shell, and an outer protective sleeve, such as... Figure 3 , Figure 9 , Figure 10 As shown. The coil component can be remotely controlled. When the copper coil is energized, the coil component, the iron core rod, and the iron core guide sleeve form an electromagnet, causing the iron core rod to move towards and into the opening and closing piston. The end of the iron core rod has an iron core rubber head, which blocks or obstructs the first through hole and / or continues to apply thrust to the opening and closing piston, eliminating the pressure difference on both sides of the opening and closing piston. The opening and closing piston is subjected to the negative pressure suction at the main medium channel of the valve body and / or the thrust applied to the iron core rod by the coil component, enabling the opening and closing piston to quickly block the medium channel. Conversely, when the coil component is de-energized, the main medium channel opens.

[0050] The core guide sleeve 21 has a third through hole distributed around its circumference. A compression spring 211 and a steel ball 212 acting on the outer circumference of the core rod 20 are installed within the third through hole. Correspondingly, annular grooves can be provided on the core rod to correspond to these steel balls. The coil component 22 enables the core rod 20 to reciprocate. Both opening and closing require energization to complete the reciprocating motion. After the motion is completed, the core maintains its position through self-positioning. Self-positioning is achieved by the three steel balls 212 and spring 211 installed in the core guide sleeve 21 and the two annular grooves on the core rod 20. Figure 3 As shown.

[0051] In addition, this application also discloses a valve, which includes a valve body 3 and the aforementioned negative pressure interruption structure. The valve body 3 is provided with a cavity 30 for installing the negative pressure interruption structure, and a flow guide channel 31 is provided on the valve body 3. The inlet end 33 is connected to the cavity 30 via the flow guide channel 31.

[0052] Since this valve adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0053] In addition, a handwheel 32 is provided on the valve body 3, and a self-closing component 4 is provided at the outlet 34 of the valve body 3. The handwheel 32 is a basic component of the valve, and national standards have stipulated specific requirements for it; the handwheel 32 is a mandatory component. Furthermore, the self-closing component 4 further enhances safety by closing the connection in case of pipe detachment. The aforementioned connection method and specific structure can be easily implemented using existing technology, and therefore possess at least the beneficial effects of the technical solution described in the above embodiments, which will not be elaborated further here.

[0054] This valve is applied to tanks containing media including but not limited to methanol, liquefied petroleum gas, and other fuel media such as liquefied dimethyl ether.

[0055] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A negative pressure interruption structure, characterized in that, include: An opening and closing piston has a first through hole axially opened at its end, and one or more second through holes radially opened on the peripheral wall of the opening and closing piston. A sealing ring is fitted around the outer periphery of the opening and closing piston; The telescopic part has a free end that can extend into the opening and closing piston to connect or disconnect the first through hole and the second through hole. When the first through hole and the second through hole are in a connected state, the opening and closing piston is pushed by the medium along with the sealing ring and moves toward the medium channel side away from the valve body, so that the inlet end and outlet end of the valve body are connected. When the first through hole and the second through hole are disconnected, the opening and closing piston moves along the medium channel side near the valve body under the negative pressure formed on the outside, so as to disconnect the inlet and outlet of the valve body.

2. The negative pressure interruption structure as described in claim 1, characterized in that: The diameters of the first through hole and the second through hole are not equal.

3. The negative pressure interruption structure as described in claim 2, characterized in that: The diameter of the first through hole is greater than the sum of the diameters of one or more second through holes.

4. The negative pressure interruption structure as described in claim 1, characterized in that: The sealing ring has a Y-shaped cross-section.

5. The negative pressure interruption structure as described in claim 4, characterized in that: The opening and closing piston has an annular groove on its circumference for installing the sealing ring.

6. The negative pressure interruption structure as described in claim 1, 4, or 5, characterized in that: A piston pad is provided at the end of the opening and closing piston.

7. The negative pressure interruption structure as described in claim 1, 2, or 4, characterized in that: The telescopic part includes an iron core rod, an iron core guide sleeve sleeved around the outer periphery of the iron core rod, and a coil component.

8. The negative pressure interruption structure as described in claim 7, characterized in that: The iron core guide sleeve has a third through hole distributed circumferentially. A compression spring and a steel ball acting on the outer circumference of the iron core rod are installed in the third through hole.

9. A valve, comprising a valve body, characterized in that: The valve body has a negative pressure interruption structure as described in any one of claims 1 to 8, the valve body is provided with a cavity for installing the negative pressure interruption structure, the valve body is provided with a flow guiding channel, and the inlet end is connected to the cavity via the flow guiding channel.

10. A valve as described in claim 9, characterized in that: The valve body is equipped with a handwheel, and the outlet end of the valve body is equipped with a self-closing component.

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