CN209800727U

CN209800727U - Power station stop valve

Info

Publication number: CN209800727U
Application number: CN201920424974.0U
Authority: CN
Inventors: 金泽润
Original assignee: Zhejiang Zhongyuan Valve Co Ltd
Current assignee: Zhejiang Zhongyuan Valve Co Ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2019-12-17
Anticipated expiration: 2029-03-29

Abstract

The utility model discloses a power station stop valve, which comprises a valve body, valve gap and valve rod, the inside valve pocket that is provided with and gets into end and discharge end and be linked together of valve body, be provided with the disk seat in the valve pocket, the valve rod one end in the valve pocket is provided with can with disk seat matched with valve clack, the valve clack holds the first valve clack in chamber including built-in, it is provided with the second valve clack that can slide from top to bottom in holding the intracavity to hold the intracavity, the clearance has between second valve clack and the first valve clack, the valve rod passes the one end and the second valve clack fixed connection of first valve clack, first valve clack is provided with towards the one side of getting into the end and can with the intercommunicating pore that holds the chamber and be linked together, one side of first valve clack. The utility model has the advantages of it is following: the stop valve has the function of flow regulation, and the flow regulation is quicker and more convenient under the condition of reducing the opening moment of the valve clack.

Description

Power station stop valve

Technical Field

The utility model relates to a valve field, in particular to power station stop valve.

Background

The stop valve generally comprises a valve body, a valve seat, a valve cover, a valve clack, a valve rod and a transmission mechanism, wherein the transmission mechanism drives the valve rod and the valve clack to move up and down, so that opening and closing or adjusting control of a valve body channel medium is realized. For a high-temperature stop valve of a thermal power station, a valve body and a valve cover of the high-temperature stop valve generally adopt forged steel parts, and hard alloy materials are welded on a valve clack and a valve seat sealing surface in a surfacing mode, so that the temperature resistance and the anti-scouring performance are improved.

However, the existing stop valve suitable for the thermal power station has the problem that the valve body flow channel generally adopts a high-inlet-low-outlet structure in order to improve the sealing performance when the stop valve is closed, so that the opening moment of the valve clack is very large, and the use requirement of quick adjustment cannot be met. Meanwhile, the flow channel opening mode is a straight-through type, and the flow in the opening process is difficult to control, so that the use of the stop valve in a power station is simplified, and the improvement is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a power station stop valve, this stop valve have flow control's function, make flow control more swift and convenient under the condition that alleviates valve clack opening moment.

The above technical purpose of the present invention can be achieved by the following technical solutions: the utility model provides a power station stop valve, includes valve body, valve gap and valve rod, the inside valve pocket that is provided with and gets into the end and discharge end and be linked together of valve body, be provided with the disk seat in the valve pocket, the one end of valve rod in the valve pocket is provided with can with disk seat matched with valve clack, the valve clack is including the built-in first valve clack that holds the chamber, it is provided with the second valve clack that can slide from top to bottom holding the intracavity, the clearance has between second valve clack and the first valve clack, the one end and the second valve clack fixed connection that the valve rod passed first valve clack, one side that first valve clack got into the end is provided with can with the intercommunicating pore that holds the chamber and be linked together, one side of first valve clack is provided with the water conservancy diversion hole that a plurality.

The utility model discloses a further set up to: the number of the flow guide holes is two.

The utility model discloses a further set up to: an included angle of 60 degrees is formed between the axial lead of each flow guide hole and the axial lead of the valve rod.

The utility model discloses a further set up to: first valve clack is including the first fixed block of two mutual symmetry settings, two the one end of first fixed block can be dismantled and be connected with same gland, the one end of valve rod is passed the gland and is connected with the second valve clack.

The utility model discloses a further set up to: the up end of second valve clack is provided with the installation pole, the valve rod supplies the installation pipe that the installation pole was pegged graft towards the lower terminal surface fixedly connected with of second valve clack, the lower terminal surface of installation pipe is provided with a plurality of along its circumference evenly distributed's flexure strip, every the flexure strip all is provided with the fixture block towards one side of installation pole, the outer wall of installation pole is provided with the draw-in groove that a plurality of can supply the fixture block embedding, every the draw-in groove all corresponds with a fixture block, a plurality of the outer wall threaded connection of flexure strip has same adapter sleeve.

The utility model discloses a further set up to: and one end of each elastic sheet facing the valve clack is provided with a stop dog for limiting the displacement of the fastener.

The utility model discloses a further set up to: and one side of the valve seat, which faces the valve clack, is provided with a valve seat sealing surface, and one side of the valve clack, which faces the valve seat, is provided with a valve clack sealing surface which can be matched with the valve seat sealing surface.

The utility model discloses a further set up to: the two flow guide holes are arranged at equal intervals.

To sum up, the utility model discloses following beneficial effect has: when the flow needs to be adjusted, the hand wheel is driven to drive the valve rod to ascend, and the valve rod can drive the second valve clack to move upwards in the containing cavity, so that the communication hole is communicated with the flow guide hole through the containing cavity, and the medium in the inlet end sequentially passes through the communication hole and the containing cavity and is finally discharged from the flow guide hole. Because the diversion holes are provided with a plurality of diversion holes and are axially arranged along the valve rod, the valve rod drives the second valve flap to move upwards in the accommodating cavity by different strokes, so that the diversion holes with corresponding number are communicated with the medium, and the flow regulation effect is further realized. If the stop valve needs to be completely started, the valve rod directly drives the second valve clack to move upwards until the top end of the second valve clack is abutted against the first valve clack; at this time, the first valve clack can be driven to move upwards by the second valve clack continuously through the upward movement of the valve rod. In this state, the shutoff valve completely opens the flow passage and is in a fully open state. If the stop valve needs to be closed, the motion state of the stop valve is opposite to the motion state, the stop valve finally moves to the bottom surface of the second valve clack to be abutted against the first valve clack, and the second valve clack applies force to the first valve clack under the action of the valve rod, so that the first valve clack is tightly matched with the valve seat. It should be noted that, because the first valve flap is not directly moved during opening, the second valve flap is moved first and is gradually communicated with the valve cavity through the flow guide hole. The medium pressure in the middle cavity is gradually released, so that the up-and-down pressure of the valve clack is balanced, and the valve clack is convenient to open.

Drawings

FIG. 1 is a schematic structural view of an embodiment;

fig. 2 is an exploded view of the second valve flap and valve stem mounting arrangement.

Reference numerals: 1. a valve body; 2. a valve cover; 3. a valve stem; 4. an entrance end; 5. a discharge end; 6. a valve cavity; 7. a valve seat; 8. a first valve flap; 9. a second valve flap; 10. a gap; 11. a communicating hole; 12. a flow guide hole; 13. a first fixed block; 14. a gland; 15. mounting a rod; 16. installing a pipe; 17. an elastic sheet; 18. a clamping block; 19. a card slot; 20. fastening sleeves; 21. and a stop block.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, the stop valve for the power station comprises a valve body 1, a valve cover 2 and a valve rod 3, wherein a valve cavity 6 communicated with an inlet end 4 and an outlet end 5 is arranged in the valve body 1, and a valve seat 7 is arranged in the valve cavity 6. The valve rod 3 is provided with a valve clack which can be matched with the valve seat 7 at one end in the valve cavity 6, and a hand wheel (not shown in the attached drawing) is arranged at one end of the valve rod 3 far away from the valve clack.

The valve clack includes built-in first valve clack 8 who holds the chamber, holds the intracavity and is provided with the second valve clack 9 that can slide from top to bottom in holding the intracavity, has clearance 10 between second valve clack 9 and the first valve clack 8. One end of the valve rod 3 passing through the first valve clack 8 is fixedly connected with the second valve clack 9. One side of the first valve clack 8 facing the inlet end 4 is provided with a communication hole 11 which can be communicated with the containing cavity, one side of the first valve clack 8 is provided with a plurality of guide holes 12 which are arranged along the axial direction of the valve rod 3, and medium in the valve is communicated with the outlet end 5 through the communication hole 11 and the guide holes 12 in sequence from the inlet end 4.

When the flow needs to be adjusted, the hand wheel is driven to drive the valve rod 3 to ascend, the valve rod 3 can drive the second valve flap 9 to move upwards in the containing cavity, so that the communication hole 11 is communicated with the diversion hole 12 through the containing cavity, and the medium in the inlet end 4 is discharged from the diversion hole 12 through the communication hole 11 and the containing cavity in sequence. Because the diversion holes 12 are provided with a plurality of diversion holes and are axially arranged along the valve rod 3, the valve rod 3 drives the second valve clack 9 to move upwards in the containing cavity by different strokes, so that the diversion holes 12 with corresponding numbers are communicated with media, and the function of regulating the flow is further achieved. If the stop valve needs to be completely started, the valve rod 3 directly drives the second valve flap 9 to move upwards until the top end of the second valve flap 9 is abutted against the first valve flap 8; at this point, the upward movement of the valve rod 3 continues, and the first flap 8 is moved upward by the second flap 9. In this state, the shutoff valve completely opens the flow passage and is in a fully open state. If the stop valve needs to be closed, the motion state of the stop valve is opposite to the motion state, and finally the stop valve moves to the bottom surface of the second valve clack 9 to be abutted against the first valve clack 8, and under the action of the valve rod 3, the second valve clack 9 applies force to the first valve clack 8, so that the first valve clack 8 and the valve seat 7 are in tight fit.

It should be noted that, when opening, the first valve flap 8 is not directly moved, but the second valve flap 9 is moved first, and gradually communicates with the valve cavity 6 through the diversion hole 12. The medium pressure in the middle cavity is gradually released, so that the up-and-down pressure of the valve clack is balanced, and the valve clack is convenient to open.

Further, the number of the diversion holes 12 is preferably two in the present embodiment.

Furthermore, an included angle of 60 degrees is formed between the axis of each guide hole 12 and the axis of the valve rod 3. Through the water conservancy diversion hole 12 that the slope set up, make its water conservancy diversion hole 12 have the inclination that is convenient for the medium inflow towards the one side that holds the chamber, have the effect of drainage.

Further, the first valve flap 8 comprises two first fixing blocks 13 which are symmetrically arranged, and one end of each of the two first fixing blocks 13 is detachably connected with the same gland 14. One end of the valve stem 3 is connected to the second valve flap 9 through a gland 14.

Further, an installation rod 15 is arranged on the upper end face of the second valve flap 9, and an installation pipe 16 for inserting the installation rod 15 is fixedly connected to the lower end face of the valve rod 3 facing the second valve flap 9. The lower terminal surface of installation pipe 16 is provided with a plurality of along its circumference evenly distributed's flexure strip 17, and every flexure strip 17 all is provided with fixture block 18 towards one side of installation pole 15, and the outer wall of installation pole 15 is provided with a plurality of draw-in groove 19 that can supply fixture block 18 to imbed, and every draw-in groove 19 all corresponds with a fixture block 18. The outer walls of the elastic pieces 17 are in threaded connection with the same fastening sleeve 20.

The stop valve used in the power station can flush the valve clack, and the flushed medium is high in temperature and pressure, so that the service life of the valve clack can be shortened. When the valve clack needs to be maintained, the valve cover 2 is firstly detached from the valve body 1, and the valve clack and the valve rod 3 are taken out together. If the first valve clack 8 is damaged, the limiting of the two connected first fixed blocks 13 is released by removing the pressing cover 14, and then the first valve clack is replaced according to the actual damaged part; if the second valve flap 9 is damaged, the fastening sleeve 20 is rotated upwards on the basis of removing the gland 14, at the moment, the lower ends of the elastic pieces 17 gradually expand outwards, and meanwhile, each elastic piece 17 drives the corresponding clamping block 18 to gradually separate from the clamping groove 19 on the outer wall of the mounting rod 15. And after the fixture block 18 is completely separated from the clamping groove 19, the valve rod 3 and the second valve clack 9 can be detached, and the second valve clack 9 can be replaced. When the valve flap needs to be installed, the installation rod 15 arranged on the second valve flap 9 is inserted into the installation pipe 16 at the bottom end of the valve rod 3 in the movement process of the valve flap, and then the fastening sleeve 20 is rotated to be gradually close to the bottom end of the elastic piece 17, so that the clamping block 18 positioned on one side of the elastic piece 17 is gradually embedded into the clamping groove 19, and the installation of the second valve flap 9 is realized. After the second valve flap 9 is mounted, the second valve flap 9 is locked and enclosed in the accommodating cavity by the two first fixing blocks 13 which are symmetrical to each other and the gland 14.

Further, the end of each elastic sheet 17 facing the valve flap is provided with a stopper 21 for limiting the displacement of the fastener.

Further, a plurality of flow guide holes 12 are arranged at equal intervals.

Further, the valve body 1 and the valve cover 2 are both made of forged steel.

Furthermore, a sealing surface of the valve seat 7 is arranged on one side of the valve seat 7 facing the valve clack, and a sealing surface of the valve clack which can be matched with the sealing surface of the valve seat 7 is arranged on one side of the valve clack facing the valve seat 7.

The specific embodiments are only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a power station stop valve, includes valve body (1), valve gap (2) and valve rod (3), valve body (1) inside be provided with get into valve pocket (6) that end (4) and discharge end (5) are linked together, be provided with disk seat (7) in valve pocket (6), valve rod (3) one end in valve pocket (6) be provided with can with disk seat (7) matched with valve clack, its characterized in that: the valve clack is including built-in first valve clack (8) that hold the chamber, it is provided with second valve clack (9) that can slide from top to bottom holding the intracavity to hold the intracavity, second valve clack (9) and first valve clack (8) between have clearance (10), the one end and second valve clack (9) fixed connection that first valve clack (8) were passed in valve rod (3), one side of first valve clack (8) orientation entering end (4) is provided with can with hold intercommunicating pore (11) that the chamber is linked together, one side of first valve clack (8) is provided with a plurality of along valve rod (3) axial setting's water conservancy diversion hole (12), the medium loops through intercommunicating pore (11) and water conservancy diversion hole (12) and discharge end (5) from entering end (4) in the valve and is linked together.

2. A plant shut-off valve as claimed in claim 1, characterized in that: the number of the flow guide holes (12) is two.

3. A plant shut-off valve as claimed in claim 1, characterized in that: an included angle of 60 degrees is formed between the axial lead of each flow guide hole (12) and the axial lead of the valve rod (3).

4. A plant shut-off valve as claimed in claim 1, characterized in that: first valve clack (8) are including two first fixed block (13) that mutual symmetry set up, two the one end of first fixed block (13) can be dismantled and be connected with same gland (14), the one end of valve rod (3) is passed gland (14) and is connected with second valve clack (9).

5. A plant shut-off valve according to claim 4, characterized in that: the up end of second valve clack (9) is provided with installation pole (15), valve rod (3) are towards installation pipe (16) that lower terminal surface fixedly connected with of second valve clack (9) supplied installation pole (15) to peg graft, the lower terminal surface of installation pipe (16) is provided with elastic sheet (17) of a plurality of along its circumference evenly distributed, every elastic sheet (17) all are provided with fixture block (18) towards one side of installation pole (15), the outer wall of installation pole (15) is provided with draw-in groove (19) that a plurality of can supply fixture block (18) embedding, every draw-in groove (19) all correspond with one fixture block (18), a plurality of the outer wall threaded connection of elastic sheet (17) has same adapter sleeve (20).

6. A plant shut-off valve according to claim 5, characterized in that: one end of each elastic sheet (17) facing the valve clack is provided with a stop block (21) for limiting the displacement of the fastener.

7. A plant shut-off valve as claimed in claim 1, characterized in that: one side of the valve seat (7) facing the valve clack is provided with a valve seat (7) sealing surface, and one side of the valve clack facing the valve seat (7) is provided with a valve clack sealing surface which can be matched with the valve seat (7) sealing surface.

8. A plant shut-off valve as claimed in claim 2, characterized in that: the two diversion holes (12) are arranged at equal intervals.