Limiting type electromagnetic gas emergency cut-off valve

Abstract

The utility model discloses a limiting type electromagnetic gas emergency cut-off valve which comprises a valve body, a movable iron core assembly, a baffle, a valve plug assembly, a spring, a leather film, a coil assembly and a pull rod assembly. The baffle and the valve plug assembly are arranged in the leather membrane, the two ends of the spring are ground to be flat and arranged on the baffle and the valve plug assembly in a sleeving mode, the upper end of the spring abuts against the baffle, the lower end of the spring abuts against the valve plug assembly, and the upper end of the movable iron core assembly sequentially penetrates through the valve plug assembly, the baffle and the leather membrane, then is installed in the coil assembly and is connected with the lower end of the pull rod assembly. The piston assembly can move downwards under the action of the coil assembly to drive the valve plug assembly to block the small valve body nozzle, or move upwards under the action of the pull rod assembly to drive the valve plug assembly to be separated from the small valve body nozzle; due to the fact that the two ends of the spring are of the grinding flat structure, the end face of the spring can be attached to the corresponding baffle and the valve plug assembly more easily, and the positioning accuracy of the spring is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas emergency shut-off valves, in particular to a position-limiting electromagnetic gas emergency shut-off valve. Background Art

[0002] The electromagnetic gas emergency shut-off valve is a safety device for gas pipelines. Under normal conditions, it opens, allowing gas to flow through the pipeline. When an external signal activates the electromagnetic coil, the shut-off valve rapidly closes, preventing gas flow. The gas emergency shut-off valve primarily uses the up-and-down motion of a moving iron core to drive the valve plug to open or seal the valve body seal. Existing shut-off valves feature a spring mounted on the lower end of the moving iron core. When power is removed, the moving iron core descends under the action of gravity and the spring's restoring force, sealing the valve body seal and achieving an emergency shut-off of gas. However, existing springs can easily slip out of position during use, resulting in inaccurate positioning. Utility Model Content

[0003] In view of the defects in the prior art, the purpose of the present invention is to provide a precisely positioned limit-type electromagnetic gas emergency shut-off valve.

[0004] The technical solution adopted in this utility model is:

[0005] 1. A limit-type electromagnetic gas emergency shut-off valve, comprising a valve body, a moving iron core assembly, a baffle, a valve plug assembly, a spring, a diaphragm, a coil assembly and a pull rod assembly; the valve body is provided with an inlet, an outlet and a valve body small mouth connecting the inlet and the outlet, the lower end of the coil assembly is detachably connected to the valve body, and the diaphragm is installed between the coil assembly and the valve body; the baffle and valve plug assembly are arranged in the diaphragm, the two ends of the spring are smoothed, and it is sleeved on the baffle and valve plug assembly, the upper end of the spring abuts against the baffle, and the lower end of the spring abuts against the valve plug assembly, the upper end of the moving iron core assembly passes through the valve plug assembly, the baffle and the diaphragm in sequence, and is installed in the coil assembly, and is connected to the lower end of the pull rod assembly, and can move downward under the action of the coil assembly to drive the valve plug assembly to seal on the valve body small mouth, or move upward under the action of the pull rod assembly to drive the valve plug assembly to separate from the valve body small mouth.

[0006] Furthermore, the valve plug assembly includes a pressure plate and a sealing gasket, the pressure plate is connected to the lower end of the moving iron core assembly, and the sealing gasket is sleeved on the pressure plate.

[0007] Furthermore, the moving iron core assembly includes a moving iron core and a connecting rod, the pressure plate, baffle and membrane are all installed on the moving iron core, the upper end of the moving iron core is connected to the lower end of the connecting rod, and the upper end of the connecting rod is connected to the pull rod assembly.

[0008] Furthermore, the lower end of the moving iron core has a connecting portion that expands radially thereto, and the pressure plate has a connecting cavity with an open lower side. A connecting hole is provided at the top of the connecting cavity. The inner diameter of the connecting hole is larger than the outer diameter of the upper end of the moving iron core and smaller than the outer diameter of the connecting portion. The upper end of the moving iron core passes through the connecting hole, and the connecting portion is confined within the connecting cavity.

[0009] Furthermore, the top of the pressure plate extends upward to form a first guide portion, and the bottom of the pressure plate extends radially thereto to form a first extension portion, and the sealing gasket is wrapped around the first extension portion.

[0010] Furthermore, the inner edge of the top of the sealing gasket extends upward to form a second guide portion, the vertical height of the second guide portion is smaller than the vertical height of the first guide portion, and the lower end of the spring is sleeved on the first guide portion and the second guide portion and abuts against the sealing gasket.

[0011] Furthermore, the top of the baffle extends radially to form a second extension portion, and the bottom of the second extension portion extends downward to form a third guide portion. The upper end of the spring is sleeved on the third guide portion and abuts against the second extension portion.

[0012] Furthermore, a half-moon-shaped section is provided on the side surface of the connecting portion.

[0013] Furthermore, the coil assembly is connected to the valve body via screws.

[0014] Furthermore, the coil assembly is equipped with a strong magnet.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0017] Figure 1 A schematic diagram of the structure of a position-limiting electromagnetic gas emergency shut-off valve provided in an embodiment of the present application;

[0018] Figure 2 A schematic structural diagram of a pressure plate provided in an embodiment of the present application;

[0019] Figure 3 This is a schematic structural diagram of the moving iron core provided in an embodiment of the present application.

[0020] Among them, the coil assembly 1, the pull rod assembly 2, the moving iron core assembly 3, the connecting rod 31, the moving iron core 32, the connecting part 321, the half-moon section 322, the membrane 4, the valve body 5, the valve body nozzle 51, the baffle 6, the spring 7, the valve plug assembly 8, the pressure plate 81, the connecting cavity 811, the connecting hole 812, the first guide part 813, the first extension part 814, and the sealing gasket 82. DETAILED DESCRIPTION

[0021] It should be noted that the functions and methods described in this utility model are merely routine adaptations of existing technologies. Therefore, the improvements made by this utility model to existing technologies essentially lie in the connections between hardware components, rather than in the functions and methods themselves. In other words, while this utility model touches upon some functions and methods, it does not include improvements to these functions and methods themselves. The description of the functions and methods in this utility model is intended to better illustrate and facilitate a better understanding of this utility model.

[0022] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0023] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which this utility model belongs.

[0024] See also Figures 1 to 3 The present application is a limit type electromagnetic gas emergency shut-off valve, comprising a valve body 5, a moving iron core assembly 3, a baffle 6, a valve plug assembly 8, a spring 7, a diaphragm 4, a coil assembly 1 and a pull rod assembly 2; the valve body 5 is provided with an inlet, an outlet and a small nozzle of the valve body 5 connecting the inlet and the outlet, the lower end of the coil assembly 1 is detachably connected to the valve body 5, and the diaphragm 4 is installed between the coil assembly 1 and the valve body 5; the baffle 6 and the valve plug assembly 8 are arranged in the diaphragm 4, the two ends of the spring 7 are ground flat, and the sleeve It is arranged on the baffle 6 and the valve plug assembly 8, the upper end of the spring 7 abuts against the baffle 6, and the lower end of the spring 7 abuts against the valve plug assembly 8. The upper end of the moving iron core assembly 3 passes through the valve plug assembly 8, the baffle 6 and the membrane 4 in sequence, and is installed in the coil assembly 1, and is connected to the lower end of the pull rod assembly 2. It can move downward under the action of the coil assembly 1 to drive the valve plug assembly 8 to seal on the small mouth of the valve body 5, or move upward under the action of the pull rod assembly 2 to drive the valve plug assembly 8 to separate from the small mouth of the valve body 5.

[0025] In this application, a baffle 6 and a valve plug assembly 8 are arranged in the membrane 4, and a spring 7 is sleeved on the baffle 6 and the valve plug assembly 8, with its upper end abutting against the baffle 6 and the lower end abutting against the valve plug assembly 8. Since the two ends of the spring 7 adopt a ground structure, the end face of the spring 7 is easier to fit tightly against the corresponding baffle 6 and valve plug assembly 8, thereby improving the positioning accuracy of the spring 7.

[0026] One end of the valve body 5 is provided with an inlet, and the other end is provided with an outlet. A small nozzle of the valve body 5 is provided between the inlet and the outlet, and the upper end thereof is open for communicating the inlet and the outlet.

[0027] After the coil is wound, it is injection molded into a coil assembly 1 , in which a strong magnet is installed; the coil assembly 1 is connected to the valve body 5 by screws.

[0028] The valve plug assembly 8 includes a pressure plate 81 and a sealing gasket 82. The pressure plate 81 is connected to the lower end of the moving iron core assembly 3, and the sealing gasket 82 is sleeved on the pressure plate 81.

[0029] The moving iron core assembly 3 includes a moving iron core 32 and a connecting rod 31. The pressure plate 81, the baffle 6 and the membrane 4 are all installed on the moving iron core 32. The upper end of the moving iron core 32 is connected to the lower end of the connecting rod 31, and the upper end of the connecting rod 31 is connected to the pull rod assembly 2.

[0030] Specifically, blind holes are provided at the upper and lower ends of the connecting rod 31. The lower end of the pull rod assembly 2 is inserted into the blind hole at the upper end of the connecting rod 31 and fixed. The upper end of the moving iron core 32 passes through the pressure plate 81, the baffle 6 and the membrane 4, and is inserted into the blind hole at the lower end of the connecting rod 31 and is threadedly connected and fixed thereto to realize the connection between the moving iron core 32, the connecting rod 31 and the pull rod assembly 2.

[0031] The lower end of the moving iron core 32 has a connecting portion 321 that expands radially toward it, and the pressure plate 81 has a connecting cavity 811 with an open lower side. A connecting hole 812 is provided at the top of the connecting cavity 811. The inner diameter of the connecting hole 812 is larger than the outer diameter of the upper end of the moving iron core 32 and smaller than the outer diameter of the connecting portion 321. The upper end of the moving iron core 32 passes through the connecting hole 812. Since the outer diameter of the connecting portion 321 is larger than the inner diameter of the connecting hole 812, it cannot pass through and is restricted in the connecting cavity 811; the sealing gasket 82 is wrapped around the outer periphery of the connecting portion 321.

[0032] With the above structure, when the coil assembly 1 is in the power-off state, the pull rod assembly 2 is pulled up, the moving iron core assembly 3 is attracted to the coil assembly 1, the valve plug seal is separated from the small mouth of the valve body 5, the inlet and outlet of the valve body 5 are connected through the small mouth, the solenoid valve is in the normally open state, and the spring 7 is compressed at the same time; when the coil assembly 1 is energized, magnetic force is generated, the magnetic pole direction of the moving iron core 32 is opposite to the direction of the strong magnetic pole installed in the coil assembly 1, the moving iron core 32 loses adsorption and moves downward rapidly, and with the restoring force of the spring 7, the valve plug assembly 8 moves downward, and the sealing gasket 82 on the valve plug assembly 8 fits tightly with the small mouth of the valve body 5, disconnecting the passage between the inlet and outlet of the valve body 5, and the solenoid valve is in the instantaneous closed state.

[0033] In order to further improve the positioning accuracy of the spring 7, the top of the pressure plate 81 extends upward to form a first guide portion 813, and the height of the first guide portion 813 is 5 mm. The bottom of the pressure plate 81 extends radially thereto to form a first extension portion 814, and the sealing gasket 82 is wrapped around the first extension portion 814; the top inner edge of the sealing gasket 82 extends upward to form a second guide portion, and the vertical height of the second guide portion is less than the vertical height of the first guide portion 813. The upper outer edge of the second guide portion is an arc-shaped transition, and the lower end of the spring 7 is sleeved on the first guide portion 813 and the second guide portion, and abuts against the sealing gasket 82.

[0034] By providing a first guide portion 813 up to 5 mm in height on the pressure plate 81 , the guide length is increased, which further makes it difficult for the spring 7 to slide out of its original position, thereby increasing the positioning accuracy of the lower end of the spring 7 .

[0035] The top of the baffle 6 extends radially to form a second extension portion, and the bottom of the second extension portion extends downward to form a third guide portion. The upper end of the spring 7 is sleeved on the third guide portion and abuts against the second extension portion.

[0036] By arranging the third guide portion and the second extension portion on the baffle 6 , the positioning accuracy of the upper end of the spring 7 is increased.

[0037] A half-moon-shaped section 322 is provided on the side of the connecting portion 321 of the moving iron core 32 , and a tool can be clamped on the half-moon-shaped section 322 for assembly and tightening, which is not easy to slip and improves production efficiency.

[0038] In this application, unless otherwise specified or limited, the terms "connected," "connect," "fixed," and the like should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0039] In the specification of the present invention, a large number of specific details are described. However, it is understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, systems, and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, systems, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, systems, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. The limited electromagnetic gas emergency shut-off valve is characterized by: The closure of the valve body is constructed by a process of moving the spring and actuating the spring to move the valve body in a direction of moving the valve stem, the process of which is to move the spring upwards to move the valve stem and the valve body in a direction of moving the valve stem. The closure of the valve body is constructed by a process of moving the spring and actuating the spring to move the valve stem in a direction of moving the valve stem. The closure of the valve body is constructed by a process of moving the spring and actuating the spring to move the valve stem in a direction of moving the valve stem.

2. The position-limiting electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: The valve plug assembly includes a pressure plate and a sealing gasket. The pressure plate is connected to the lower end of the moving iron core assembly, and the sealing gasket is sleeved on the pressure plate.

3. The position-limiting electromagnetic gas emergency shut-off valve according to claim 2, characterized in that: The moving iron core assembly includes a moving iron core and a connecting rod. The pressure plate, baffle and membrane are all installed on the moving iron core. The upper end of the moving iron core is connected to the lower end of the connecting rod, and the upper end of the connecting rod is connected to the pull rod assembly.

4. The position-limiting electromagnetic gas emergency shut-off valve according to claim 3, characterized in that: The lower end of the moving iron core has a connecting portion that expands radially thereto, and the pressure plate has a connecting cavity with an open lower side. A connecting hole is provided at the top of the connecting cavity. The inner diameter of the connecting hole is larger than the outer diameter of the upper end of the moving iron core and smaller than the outer diameter of the connecting portion. The upper end of the moving iron core passes through the connecting hole, and the connecting portion is confined within the connecting cavity.

5. The position-limiting electromagnetic gas emergency shut-off valve according to claim 4, characterized in that: The top of the pressing plate extends upward to form a first guide portion, and the bottom of the pressing plate extends radially thereto to form a first extending portion, and the sealing gasket is wrapped around the first extending portion.

6. The position-limited electromagnetic gas emergency shut-off valve according to claim 5, characterized in that: The inner edge of the top of the sealing gasket extends upward to form a second guide portion, the vertical height of the second guide portion is smaller than the vertical height of the first guide portion, and the lower end of the spring is sleeved on the first and second guide portions and abuts against the sealing gasket.

7. The position-limiting electromagnetic gas emergency shut-off valve according to claim 3, characterized in that: The top of the baffle extends radially to form a second extension portion, and the bottom of the second extension portion extends downward to form a third guide portion. The upper end of the spring is sleeved on the third guide portion and abuts against the second extension portion.

8. The position-limiting electromagnetic gas emergency shut-off valve according to claim 4, characterized in that: A half-moon section is provided on the side surface of the connecting portion.

9. The position-limited electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: The coil assembly is connected to the valve body via screws.

10. The position-limited electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: The coil assembly is equipped with a strong magnet.

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