Spring quick shut-off valve

Abstract

The utility model relates to a spring quick shut-off valve which comprises a valve body. The valve rod is rotationally connected with the valve body so as to control the flux of fluid in the valve body; the base is fixedly connected with the valve body; the driving gear is coaxially and fixedly connected with the valve rod; the number of the driving racks is two, the two driving racks are arranged on the two sides of the driving gear respectively and meshed with the driving gear, and the driving racks are connected with the base and can move in a reciprocating mode. The quick-closing spring is connected with the driving rack and the base, and the valve is in a closed state under the action of the quick-closing spring; the base is provided with a moving piece used for controlling the driving rack to move in a reciprocating mode. The dual-driving rack is adopted for driving, so that stress of the driving gear and the valve rod is more balanced, jamming is not prone to occurring, stress of teeth can be greatly reduced during dual-rack driving, the possibility that the teeth of the driving rack and the teeth of the driving gear are broken is reduced, meanwhile, a gap between the dual-driving rack and the driving gear is smaller, and the service life of the valve rod is prolonged. And the valve is not easy to shake.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of valve production, and in particular to a spring quick-closing valve. BACKGROUND

[0002] The quick-closing valve is an important component of the safety system of a steam turbine unit of a power plant, and is an important safety device for ensuring safe operation of the steam turbine unit and preventing steam backflow in a pipeline from causing an overspeed accident of the steam turbine unit.

[0003] The valve in the prior art comprises a valve body, a valve rod and a driving device, the valve body is connected with a pipeline, the valve rod is rotationally connected with the valve body to control the flux of fluid in the valve body, and the driving device is connected with the valve rod to drive the valve rod to rotate, but the valve rod is prone to shaking when being driven by the driving device to operate. TECHNICAL PROBLEM

[0004] In order to improve the problem of valve shaking, the application provides a spring quick-closing valve.

[0005] The spring quick-closing valve provided by the application adopts the following technical scheme:

[0006] The spring quick-closing valve comprises:

[0007] a valve body;

[0008] a valve rod, which is rotationally connected with the valve body to control the flux of fluid in the valve body;

[0009] a base, which is fixedly connected with the valve body;

[0010] a driving gear, which is fixedly connected coaxially with the valve rod;

[0011] two driving racks, which are arranged on the two sides of the driving gear and are in mesh with the driving gear, the driving racks are connected with the base and can reciprocate;

[0012] a quick-closing spring, which connects the driving racks and the base, and under the elastic force of the quick-closing spring, the valve rod is in a state of closing the valve body;

[0013] a moving piece arranged on the base and used for controlling the reciprocation of the driving racks.

[0014] By adopting the technical scheme, the driving device in the related art adopts a rack and pinion transmission mechanism to convert straight stroke output of an oil cylinder or a gas cylinder into angular stroke output, but the current rack and pinion has only single-side power output, the driving mode causes uneven force on the pinion, and the pinion is prone to jamming and tooth breakage, and in addition, a certain gap between the pinion and the rack causes valve shaking; in the application, the double driving racks drive the driving pinion, so that the force on the driving pinion and the valve rod is more balanced, and the double driving racks can greatly reduce the force on the teeth, thereby reducing the possibility of tooth breakage of the driving racks and the driving pinion, and the gap between the double driving racks and the driving pinion is smaller, so that the valve is less prone to shaking.

[0015] Further, the moving part comprises a moving cylinder, a cylinder body of the moving cylinder is fixedly connected with the base, and a piston rod of the moving cylinder is fixedly connected with the driving rack.

[0016] Further, the base is fixedly connected with a shell, the shell is correspondingly arranged with the driving rack, and the shell is arranged outside the corresponding driving rack.

[0017] Further, the shell is provided with a displacement sensor on a side away from a cylinder bottom of the moving cylinder.

[0018] Further, the control valve group of the moving cylinder is fixedly connected with the base.

[0019] Further, the driving pinion extends into the shell on both sides.

[0020] Further, the quick closing spring is located in the cylinder body of the moving cylinder, and one end of the quick closing spring abuts against the cylinder bottom of the moving cylinder, and the other end of the quick closing spring abuts against the piston of the moving cylinder.

[0021] In summary, the application has the following beneficial technical effects: the double driving racks drive the driving pinion, so that the force on the driving pinion and the valve rod is more balanced, and the double driving racks can greatly reduce the force on the driving racks and the driving pinion, thereby reducing the possibility of tooth breakage of the driving racks and the driving pinion, and the gap between the double driving racks and the driving pinion is smaller, so that the valve is less prone to shaking; in addition, the control valve group of the moving cylinder is integrated on the base in the application, so that the spring quick closing valve has higher integration, thereby achieving the purpose of saving space. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of the embodiment of the application.

[0023] 100, valve body; 200, valve stem; 300, base; 310, moving part; 320, housing; 321, displacement sensor; 330, control valve group; 400, drive gear; 500, drive rack; 600, quick closing spring. DETAILED DESCRIPTION

[0024] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] The embodiments of the present application disclose a spring quick closing valve. Referring to Figure 1 , the spring quick closing valve comprises a valve body 100, a valve stem 200, a base 300, a drive gear 400, a drive rack 500 and a quick closing spring 600.

[0026] The valve body 100 is connected with a pipeline, and the valve stem 200 is rotationally connected with the valve body 100 to control the flux of fluid in the valve body 100. The base 300 is fixedly connected with the valve body 100. The drive gear 400 is coaxially fixedly connected with the valve stem 200, and the axis of the drive gear 400 is arranged in line with the rotation axis of the valve stem 200. Two drive racks 500 and two quick closing springs 600 are arranged, and the drive rack 500 and the quick closing spring 600 correspond to each other. The two drive racks 500 are arranged on the two sides of the drive gear 400 and are engaged with the drive gear 400, and the drive rack 500 can reciprocate in a direction perpendicular to the axial direction of the valve stem 200 to drive the drive gear 400 to reciprocate. The quick closing spring 600 is connected with the corresponding drive rack 500 and the base 300, and under the elastic force of the quick closing spring 600, the corresponding drive rack 500 can drive the drive gear 400 and make the valve stem 200 rotate to the purpose of closing the valve body 100.

[0027] The base 300 is provided with a moving part 310 for controlling the reciprocating movement of the drive rack 500. In the present embodiment, the moving part 310 is a moving oil cylinder, the cylinder body of the moving oil cylinder is fixedly connected with the base 300, and the piston rod of the moving oil cylinder is fixedly connected with the drive rack 500, so that the moving oil cylinder can drive the drive rack 500 to reciprocate. In other embodiments, the moving part 310 can also be a moving air cylinder or a linear motor which can realize linear motion.

[0028] To protect the drive rack 500 from corrosion by dust and other impurities, a housing 320 is fixedly connected to the base 300, and the housing 320 is fitted over the outside of the drive rack 500. Both sides of the drive gear 400 extend into the housing 320, thereby reducing the amount of dust at the meshing points of the drive gear 400 and the drive rack 500.

[0029] To further facilitate the operation of the valve body 100, a displacement sensor 321 is provided on the side of the housing 320 away from the bottom of the moving cylinder to detect the movement position of the drive rack 500 and thus display the rotation angle of the valve stem 200.

[0030] To prevent damage to the quick-closing spring 600, it is placed inside the cylinder of the movable cylinder, with one end contacting the bottom of the cylinder body and the other end contacting the piston rod. Under the elastic force of the quick-closing spring 600, the piston of the movable cylinder is retracted into the cylinder body. In case of emergency, the quick-closing spring 600 can drive the corresponding drive rack 500 to close the valve.

[0031] In order to improve the integration of the spring quick-shut-off valve and reduce its space occupation, the control valve assembly 330 of the moving cylinder is fixedly connected to the base 300. In this embodiment, the control valve assembly 330 of the moving cylinder and the base 300 are connected by bolts.

[0032] Based on the spring-loaded quick-closing valve described in this application, this application also proposes an application of the spring-loaded quick-closing valve, which is mainly used in power plant gas extraction quick-closing valves, steel plant gas quick-closing valves, etc.

[0033] The implementation principle of a spring-loaded quick-closing valve in this application embodiment is as follows: According to the fluid flow requirements in the valve body 100, the operator can activate the moving cylinder to move the drive rack 500 and drive the drive gear 400 to rotate, that is, the valve stem 200 rotates, thereby realizing the adjustment of the fluid flow in the valve body 100.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A spring-loaded quick-closing valve, characterized in that, include: Valve body (100); The valve stem (200) is rotatably connected to the valve body (100) to control the flow rate of fluid inside the valve body (100); The base (300) is fixedly connected to the valve body (100); The drive gear (400) is coaxially and fixedly connected to the valve stem (200); Two drive racks (500) are provided, which are respectively located on both sides of the drive gear (400) and mesh with the drive gear (400). The drive racks (500) are connected to the base (300) and can reciprocate. A quick-closing spring (600) connects the drive rack (500) and the base (300). Under the elastic force of the quick-closing spring (600), the valve stem (200) is in the state of closing the valve body (100). The base (300) is provided with a moving part (310) for controlling the reciprocating movement of the drive rack (500).

2. The spring-loaded quick-closing valve according to claim 1, characterized in that, The moving part (310) includes a moving cylinder, the cylinder body of which is fixedly connected to the base (300), and the piston rod of which is fixedly connected to the drive rack (500).

3. A spring-loaded quick-closing valve according to claim 2, characterized in that, A housing (320) is fixedly connected to the base (300). The housing (320) is correspondingly arranged with the drive rack (500), and the housing (320) is sleeved on the outside of the corresponding drive rack (500).

4. A spring-loaded quick-closing valve according to claim 3, characterized in that, A displacement sensor (321) is provided on the side of the housing (320) away from the bottom of the moving cylinder.

5. A spring-loaded quick-closing valve according to claim 2, characterized in that, The control valve assembly (330) of the movable cylinder is fixedly connected to the base (300).

6. A spring-loaded quick-closing valve according to claim 3, characterized in that, The drive gear (400) extends into the housing (320) on both sides.

7. A spring-loaded quick-closing valve according to claim 6, characterized in that, The quick-closing spring (600) is located inside the cylinder of the movable cylinder, and one end of the quick-closing spring (600) abuts against the bottom of the movable cylinder, while the other end abuts against the piston of the movable cylinder.

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