CN216590006U

CN216590006U - Main steam valve spring elasticity reinforcing means

Info

Publication number: CN216590006U
Application number: CN202122633153.8U
Authority: CN
Inventors: 王小龙; 张艳珍; 刘上源; 王赢月; 侯世剑
Original assignee: Lingyuan Iron & Steel Group Co ltd; Lingyuan Iron and Steel Co Ltd
Current assignee: Lingyuan Iron and Steel Co Ltd
Priority date: 2021-10-31
Filing date: 2021-10-31
Publication date: 2022-05-24
Anticipated expiration: 2031-10-31

Abstract

A main steam valve spring elasticity enhancing device is provided with a spring, an annular gasket, a piston, a cylinder body center rod, a valve rod and a valve core; the spring, the annular gasket and the piston are arranged in the cylinder body, a first through hole matched with the central rod is formed in the upper end of the cylinder body, and the bottom end of the central rod penetrates through the first through hole, the spring and the annular gasket and is fixed to the top of the piston; the end part of the bottom end of the cylinder body is provided with a second through hole matched with the valve rod, the upper end of the valve rod penetrates through the second through hole and is fixed at the bottom of the cylinder body, and the bottom end of the valve rod is provided with a valve core; and oil ports are arranged on the side walls of the two sides of the cylinder body and are positioned between the piston and the bottom end of the cylinder body. The annular gasket is additionally arranged between the spring and the piston and used for compensating the effective length of the spring lost due to elastic decline, the problems that the steam main steam valve is closed lagged and is not tight and a steam source cannot be cut off quickly and reliably due to the elastic decline of the spring are solved, the structure and the manufacture are simple, and the purposes of enhancing the elasticity of the spring, prolonging the service life of the spring and realizing safe and efficient production are achieved.

Description

Main steam valve spring elasticity reinforcing means

Technical Field

The utility model relates to the technical field of main steam valves of steam turbines, in particular to a main steam valve spring elasticity enhancing device.

Background

The air inlet and the air exhaust of the steam turbine are mainly realized through the matching action of various valves, wherein a high-pressure main steam valve is a valve which enables main steam to enter the steam turbine and can be quickly closed, and when an accident happens, the main steam valve can immediately and reliably cut off the air inlet of the steam turbine to realize safe stop, so that the main steam valve is an important protection device for the safe operation of a steam turbine air supply system. The existing main steam valve opening process: the oil inlet valve is opened, power oil enters the cylinder body to establish oil pressure, the piston is pushed to move upwards, the valve core moves upwards synchronously, the valve core is far away from the valve, the main steam valve is opened, the opening state of the main steam valve is maintained through the oil pressure, and at the moment, the spring is in a compressed state; the main steam valve closing process: the oil drain valve is opened, the oil inlet valve is closed, oil drain is opened, oil pressure is reduced, the spring extends to push the piston to move downwards, the valve core moves downwards to the valve, and the main steam valve is closed.

The spring is a main device for realizing the quick closing of the main steam valve, and in the use process of the main steam valve, the reciprocating opening and closing of the main steam valve are continuously stretched and compressed along with the spring, the elasticity of the spring is weakened after long-term use, the length of the spring is shortened, the spring cannot be replaced or repaired in time under special conditions or during production, the main steam valve is closed lagged and not tight, a steam source cannot be quickly and reliably cut off, and the safety is seriously damaged.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a main steam valve spring elasticity enhancing device, wherein an annular gasket with a certain thickness is additionally arranged between a spring and a piston, so that the problems that the main steam valve is lagged in closing and not tight and the air source cannot be quickly and reliably cut off due to the fact that the elasticity of the spring is weakened and the length of the spring is shortened in long-term use are solved.

The technical scheme for solving the technical problems is as follows: a main steam valve spring elasticity enhancing device comprises a spring, an annular gasket, a piston, a cylinder body, a central rod, a valve rod and a valve core; the spring, the annular gasket and the piston are arranged in the cylinder body, a first through hole matched with the central rod is formed in the upper end of the cylinder body, and the bottom end of the central rod sequentially penetrates through the first through hole, the spring and the annular gasket to be fixed to the top of the piston; the end part of the bottom end of the cylinder body is provided with a second through hole matched with the valve rod, the upper end of the valve rod penetrates through the second through hole and is fixed at the bottom of the cylinder body, and the bottom end of the valve rod is provided with the valve core; and oil ports are arranged on the side walls of the two sides of the cylinder body and are positioned between the piston and the bottom end of the cylinder body.

As a preferable scheme of the main steam valve spring elasticity enhancing device, the annular gasket is fixed between the spring and the piston; the bottom end of the spring is abutted against the upper end face of the annular gasket.

As a preferable scheme of the main steam valve spring elasticity enhancing device, the spring, the annular gasket, the piston, the center rod, the valve rod and the valve core are coaxially arranged.

As the preferable scheme of the main steam valve spring elasticity enhancing device, the valve core is positioned on the outer side of the cylinder body, a valve is arranged on the front side of the valve core, and the valve core and the valve are coaxially arranged. .

As the preferred scheme of the main steam valve spring elasticity enhancing device, a switch valve is arranged on a pipeline at the rear side of the oil port and used for adjusting oil inlet or oil discharge of the oil port.

As the preferred scheme of the main steam valve spring elasticity enhancing device, the first through hole is in sealing arrangement, and the second through hole is in sealing arrangement.

As the preferred scheme of the main steam valve spring elasticity enhancing device, the annular gasket is made of heat-resistant stainless steel.

The utility model has the beneficial effects that: the piston is provided with a spring, an annular gasket, a piston, a cylinder body, a central rod, a valve rod and a valve core; the spring, the annular gasket and the piston are arranged in the cylinder body, a first through hole matched with the central rod is formed in the upper end of the cylinder body, and the bottom end of the central rod sequentially penetrates through the first through hole, the spring and the annular gasket to be fixed to the top of the piston; the end part of the bottom end of the cylinder body is provided with a second through hole matched with the valve rod, the upper end of the valve rod penetrates through the second through hole and is fixed at the bottom of the cylinder body, and the bottom end of the valve rod is provided with a valve core; the side walls of the two sides of the cylinder body are provided with oil ports which are positioned between the piston and the bottom end of the cylinder body. The annular gasket is additionally arranged between the spring and the piston and used for compensating the length of the spring lost due to elastic decline, so that the problems that the main steam valve is closed late and not tight and a steam source cannot be cut off quickly and reliably in an accident state due to the elastic decline of the spring and the shortening of the spring are effectively solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.

FIG. 1 is a schematic structural view of a main steam valve spring elasticity enhancing device provided in an embodiment of the present invention;

FIG. 2 is a front view of a main steam valve spring enhancement device annular gasket provided in an embodiment of the present invention;

fig. 3 is a top view of an annular gasket of a main steam valve spring elasticity enhancing device provided in an embodiment of the present invention.

In the figure, 1, a spring; 2. an annular gasket; 3. a piston; 4. a cylinder body; 5. a center pole; 6. a valve stem; 7. a valve core; 8. a first through hole; 9. a second through hole; 10. an oil port; 11. a valve; 12. and (4) switching on and off the valve.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Referring to fig. 1, 2 and 3, a main steam valve spring elasticity enhancing device is provided, which comprises a spring 1, an annular gasket 2, a piston 3, a cylinder 4, a central rod 5, a valve rod 6 and a valve core 7; the spring 1, the annular gasket 2 and the piston 3 are arranged in the cylinder body 4, a first through hole 8 matched with the central rod 5 is formed in the upper end of the cylinder body 4, and the bottom end of the central rod 5 sequentially penetrates through the first through hole 8, the spring 1 and the annular gasket 2 to be fixed to the top of the piston 3; the end part of the bottom end of the cylinder body 4 is provided with a second through hole 9 matched with the valve rod 6, the upper end of the valve rod 6 penetrates through the second through hole 9 and is fixed at the bottom of the cylinder body 4, and the bottom end of the valve rod 6 is provided with the valve core 7; and oil ports 10 are formed in the side walls of two sides of the cylinder body 4, and the oil ports 10 are positioned between the piston 3 and the bottom end of the cylinder body 4.

In this embodiment, the annular gasket 2 is fixed between the spring 1 and the piston 3; the bottom end of the spring 1 is abutted against the upper end face of the annular gasket 2. Add annular gasket 2 between spring 1 and piston 3, the 1 bottom of spring is moved to annular gasket 2 up end by the 3 tops of piston, aim at, when 1 elasticity decline length of spring shortens for the length of 1 loss of compensation spring, in order to reach 1 life of extension spring, the purpose of keeping 1 elastic effect of spring, can be fast, timely, reliable cut off the air supply and provide the guarantee for steam turbine accident situation time main steam valve, further provide the necessary guarantee for enterprise's safety in production.

In this embodiment, the spring 1, the annular gasket 2, the piston 3, the central rod 5, the valve rod 6, and the valve core 7 are coaxially disposed. The coaxial arrangement of each component aims to prevent the components from moving to generate relative displacement in the reciprocating opening and closing process of the main steam valve, and guarantee is provided for the safe and reliable operation and the sealing performance of the device.

In this embodiment, the valve core 7 is located outside the cylinder 4, a valve 11 is disposed on the front side of the valve core 7, and the valve core 7 and the valve 11 are coaxially disposed. The valve core 7 and the valve 11 are coaxially arranged, so that the valve core 7 and the valve 11 are completely closed, and a basic guarantee is provided for completely cutting off a gas source of the main steam valve and ensuring the safety of the steam turbine.

In this embodiment, a line at the rear side of the oil port 10 is provided with a switch valve 12, and the switch valve 12 is used for adjusting oil inlet or oil discharge of the oil port 10. The switch valve 12 is adjusted, oil is fed or drained into a cavity between the piston 3 and the bottom end of the cylinder body 4 through the oil port 10, the opening and closing of the main steam valve are achieved, the oil is fed or drained to share the same oil port 10, and the device setting is effectively simplified.

In this embodiment, the first through hole 8 is sealed, and the second through hole 9 is sealed. First through-hole 8 and second through-hole 9 department all do sealed setting, and aim at keeps the interior oil pressure of cylinder body 4 stable, guarantees that the main stop valve opening state is stable, provides the guarantee for steam turbine safe high-efficient operation.

The utility model is provided with a spring 1, an annular gasket 2, a piston 3, a cylinder 4, a central rod 5, a valve rod 6 and a valve core 7; the spring 1, the annular gasket 2 and the piston 3 are arranged in the cylinder body 4, a first through hole 8 matched with the central rod 5 is formed in the upper end of the cylinder body 4, and the bottom end of the central rod 5 sequentially penetrates through the first through hole 8, the spring 1 and the annular gasket 2 to be fixed to the top of the piston 3; a second through hole 9 matched with the valve rod 6 is formed in the end portion of the bottom end of the cylinder body 4, the upper end of the valve rod 6 penetrates through the second through hole 9 to be fixed to the bottom of the cylinder body 4, and a valve core 7 is arranged at the bottom end of the valve rod 6; the side walls of the two sides of the cylinder body 4 are provided with oil ports 10, and the oil ports 10 are positioned between the piston 3 and the bottom end of the cylinder body 4. Compensate the length of loss, annular gasket 2 is fixed in spring 1 with between the piston 3, add the annular gasket 2 of certain thickness between spring 1 and piston 3 to the long-time back of using of compensation, spring 1 is because of elasticity decline, length shortens the lost length, aim at, fail to in time change or maintain the condition to the spring 1 that elasticity descends, keep spring 1 elastic effect, can be fast for the main steam valve, in time, reliable air supply that cuts off guarantees production safety and provides the guarantee, spring 1's life has been prolonged simultaneously. The components in the device are coaxially arranged, so that in the reciprocating opening and closing process of the main steam valve, the transverse relative displacement among the components is effectively avoided, and the safe and efficient operation of equipment and the closing effect of the main steam valve are effectively ensured. The sealing structure design is made at the second through hole 9, which is to keep the oil pressure in the cylinder 4 stable, and provide guarantee for smooth and stable opening of the main steam valve and for keeping the stable opening state. The annular gasket is additionally arranged between the spring and the piston and used for compensating the length of the spring lost due to elastic decline, so that the problems that the main steam valve is closed late and not tight and a steam source cannot be cut off quickly and reliably in an accident state due to the elastic decline of the spring and the shortening of the spring are effectively solved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A main steam valve spring elasticity enhancing device is characterized by comprising a spring (1), an annular gasket (2), a piston (3), a cylinder body (4), a central rod (5), a valve rod (6) and a valve core (7); the spring (1), the annular gasket (2) and the piston (3) are arranged in the cylinder body (4), a first through hole (8) matched with the central rod (5) is formed in the upper end of the cylinder body (4), and the bottom end of the central rod (5) sequentially penetrates through the first through hole (8), the spring (1) and the annular gasket (2) to be fixed to the top of the piston (3); a second through hole (9) matched with the valve rod (6) is formed in the end portion of the bottom end of the cylinder body (4), the upper end of the valve rod (6) penetrates through the second through hole (9) to be fixed to the bottom of the cylinder body (4), and the valve core (7) is arranged at the bottom end of the valve rod (6); and oil ports (10) are formed in the side walls of the two sides of the cylinder body (4), and the oil ports (10) are located between the piston (3) and the bottom end of the cylinder body (4).

2. A main steam valve spring elasticity enhancing device according to claim 1, characterized in that the annular gasket (2) is fixed between the spring (1) and the piston (3); the bottom end of the spring (1) is abutted against the upper end face of the annular gasket (2).

3. A main steam valve spring elasticity enhancing device according to claim 1, characterized in that the spring (1), the annular gasket (2), the piston (3), the central rod (5), the valve stem (6) and the valve core (7) are coaxially arranged.

4. The main steam valve spring elasticity enhancing device of claim 1, characterized in that the valve core (7) is located outside the cylinder (4), a valve (11) is arranged on the front side of the valve core (7), and the valve core (7) and the valve (11) are coaxially arranged.

5. The main steam valve spring elasticity enhancing device of claim 1, characterized in that a switch valve (12) is arranged on a pipeline at the rear side of the oil port (10), and the switch valve (12) is used for adjusting oil feeding or oil discharging of the oil port (10).

6. A main steam valve spring elasticity enhancing device according to claim 1, characterized in that the first through hole (8) is sealed and the second through hole (9) is sealed.

7. A main steam valve spring elasticity enhancing device according to claim 1, characterized in that the annular gasket (2) is made of heat-resistant stainless steel.