Novel valve rod sealing device
A sealing device and valve stem technology, applied in valve device, shaft seal, valve lift, etc., can solve the problems of easy breakage of valve stem, shutdown, fatigue crack, etc., and achieve the effect of improving safety performance
Inactive Publication Date: 2021-06-08
沂源县华阳能源设备有限公司
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- Description
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AI Technical Summary
Problems solved by technology
[0003] The technical problem to be solved by the present invention is that the valve stem of the main steam valve of the steam turbine in the power plant is worn at the matching parts on both sides during operation, causing the gap to increase and bend. When the valve stem moves up and down, the valve stem bears a variable bending load. In the middle, it is often bent, the valve stem is set on the stem sleeve, the fixed ring, the movable ring, and the leak hole. The movable ring does not move more than 3mm left and right. The fixed ring is 40mm, and the diameter of the movable ring is 43mm. The stem is easy to break, and the new valve cannot be opened or closed tightly, that is, the valve stem is stuck, and the last few millimeters cannot be closed. After replacing the spring, the effect is not good. After a long time, it will cause fatigue cracks, and in severe cases, the valve stem will break. , causing downtime
Method used
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Embodiment Construction
[0020] Below in conjunction with embodiment, further illustrate the present invention.
[0021] see figure 1 , image 3 It can be seen that a novel valve stem sealing device of the present invention includes a valve stem, a sleeve 11 and a sealing ring on the body of the valve stem sealing device. The sleeve 11 is provided with a plurality of movable rings 48, the movable ring 48 and the sleeve There is a gap between the cylinders 11, the gap is that the movable ring 48 can move left and right in the sleeve 11 no more than three millimeters, the upper part of the sleeve 11 is provided with a nut to limit the movement of the sealing ring, and the middle of the valve stem is provided with Air leakage hole 50, the two ends of air leakage hole 50 are provided with air leakage garland 51, the nut is M76×3, the thermal expansion gap is provided in the sleeve 11, and a plurality of fixing rings 49 are arranged in the sleeve 11 to fix The ring 49 is arranged between the two movable ...
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The invention discloses a novel valve rod sealing device. The novel valve rod sealing device comprises a valve rod sealing device body, wherein the valve rod sealing device body is provided with a valve rod, a sleeve and a sealing ring, a plurality of movable rings are arranged in the sleeve, gaps are formed between the movable rings and the sleeve, the gaps are formed in the mode that the movable rings move left and right in the sleeve by not more than 3mm, a nut is arranged on the upper part of the sleeve to limit the sealing ring from moving upwards, an air leakage hole is formed in the middle of the valve rod, and air leakage garlands are arranged at two ends of the air leakage hole. The movable rings are arranged, so that the safety performance is improved. An air leakage aperture is straight, has the air inflation property and is in a zigzag state at present, if modification is performed, the air tightness can be adjusted, and a valve rod groove cannot fall into a movable joint.
Description
technical field [0001] The invention relates to the field of steam turbine equipment, in particular to a novel valve rod sealing device. Background technique [0002] Due to the wear of the valve stem of the main steam valve of the steam turbine in the power plant, the matching parts on both sides are worn during operation, causing the gap to increase and bend. When the valve stem moves up and down, the valve stem bears a variable bending load. In the valve stem sleeve, the fixed ring, the movable ring, the leak hole, the movable ring does not move more than 3mm left and right, the fixed ring is 40mm, and the diameter of the movable ring is 43mm. If it does not open or close tightly, it means that the valve stem is stuck, and the last few millimeters cannot be closed. After replacing the spring, the effect is not good. After a long time, it will cause fatigue cracks, and in severe cases, the valve stem will break and cause shutdown. Contents of the invention [0003] The ...
Claims
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IPC IPC(8): F16K41/02F16K1/32
CPCF16K41/02F16K1/32
Inventor 赵同斌
Owner 沂源县华阳能源设备有限公司