CN219888872U - Valve rod lifting structure capable of preventing rotation from falling off - Google Patents
Valve rod lifting structure capable of preventing rotation from falling off Download PDFInfo
- Publication number
- CN219888872U CN219888872U CN202320457103.5U CN202320457103U CN219888872U CN 219888872 U CN219888872 U CN 219888872U CN 202320457103 U CN202320457103 U CN 202320457103U CN 219888872 U CN219888872 U CN 219888872U
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- valve rod
- lifting
- cross
- lifting nut
- nut
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- 238000009434 installation Methods 0.000 claims description 5
- 230000007547 defect Effects 0.000 abstract description 2
- 230000001788 irregular Effects 0.000 abstract description 2
- 238000001125 extrusion Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- JJLJMEJHUUYSSY-UHFFFAOYSA-L Copper hydroxide Chemical compound [OH-].[OH-].[Cu+2] JJLJMEJHUUYSSY-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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- Lift Valve (AREA)
Abstract
The utility model relates to the technical field of high-temperature high-pressure speed regulation main valves of steam turbines of thermal power plants, and discloses a valve rod lifting structure capable of preventing rotary falling, which comprises the following components: the anti-rotation lifting nut structure is arranged in the cross lifting sleeve, and the anti-rotation clamping block is arranged outside the cross lifting sleeve; the valve rod lifting structure capable of preventing the rotation and the falling is mainly in a threaded connection and cylindrical transverse pin connection mode; the valve rod lifting structure capable of preventing the valve rod from rotating and falling comprises a cross lifting sleeve, a valve rod, an anti-rotation transverse pin, a slotted lifting nut, a guide cylindrical pin, a round plug screw, an anti-rotation clamping block and a high-temperature bolt which are sequentially pressed and installed into a whole; according to the utility model, the self-locking principle of screw thread and cylindrical pin extrusion is utilized, so that the defect that the valve rod rotates and falls off due to irregular vibration generated by high-temperature high-pressure steam flow disturbance is effectively overcome, the reliability of a high-temperature high-pressure speed regulation main valve is ensured, and the running stability of a steam turbine generator set and a power grid is improved.
Description
Technical Field
The utility model relates to the technical field of high-temperature high-pressure speed regulation main valves of thermal power plants, in particular to a valve rod lifting structure capable of preventing rotary falling.
Background
The load and the rotating speed of a steam turbine of a thermal power plant are realized by a steam distribution mechanism, the steam turbine is controlled by a digital electrohydraulic control system, a high-pressure speed regulating main steam valve is an important regulating device and is important thermal equipment, the equipment performance of the high-pressure speed regulating main steam valve directly influences the regulating characteristic and economy of a unit, the high-pressure speed regulating main steam valve changes the steam flow entering a cylinder according to the instruction of the system to achieve the regulation of the load and the rotating speed, the operating mode of the high-pressure speed regulating main steam valve adopts a lever mechanism, the high-pressure speed regulating main steam valve is operated by a single-side oil motor which is closed by a spring, about 11 megapascal hydraulic oil is required to be opened by a servo valve, the servo valve receives the instruction of the system to operate a valve switch, and after the operating rotating speed is reached, the opening degree of the valve is controlled by the speed regulating system to meet the supply quantity of steam under various loads. The valve rod of the high-pressure speed-regulating main steam valve is directly connected with a cross lifting sleeve in the control seat in a threaded mode, an anti-rotation pin is assembled and fixed, after a unit runs for a period of time, the valve is subjected to lifting force during opening and closing and peak shaving of a power grid and disturbance exciting force of high-temperature and high-pressure steam flow, the valve rod is subjected to irregular vibration, disturbance impact and shearing fracture, the valve rod and the cross lifting sleeve are caused to fall off, or the valve rod is withdrawn, the valve rod and the cross head are connected with threads in a clamping manner, so that the high-pressure speed-regulating main steam valve cannot act, the running of a steam turbine and the safety of the unit are seriously influenced, the reliability of the high-pressure speed-regulating main steam valve directly influences the load of the unit and the economy of the unit, and the stable running of the power grid are influenced.
Disclosure of Invention
The utility model provides a valve rod lifting structure capable of preventing rotation and falling off, which aims at the defects existing in the prior art.
7. In order to solve the problems, the technical scheme adopted by the utility model is as follows: the utility model provides a valve rod lifting structure that anti-rotation drops, includes cross lifting sleeve (9), its characterized in that: the inside of the cross lifting sleeve (9) is provided with a cylindrical step threaded hole, a valve rod (1), a screw plug (4), a lifting nut (5) and an anti-rotation transverse pin (6), an adjusting cushion block (8) is arranged in the cross lifting sleeve (9), the lifting nut (5) is used for being connected with the cross lifting sleeve (9) as the valve rod (1), the outer circle of the lifting nut (5) is in clearance fit with a hole at the upper part of the cross lifting sleeve (9), a guide groove is formed in the outer circle of the lifting nut (5), and a guide pin (7) is arranged on the cross lifting sleeve (9) to prevent the lifting nut (5) from rotating and ensure that the lifting nut (5) can move up and down; the positioning of the lifting nut is completed by a screw plug (4), and threads are formed on the surface of the screw plug (4) and are matched and screwed with the internal threads of a cross lifting sleeve (9); the end face of the cross lifting sleeve (9) is provided with a threaded hole, the cylindrical surface of the valve rod (1) is provided with four planes, the anti-rotation clamping block (2) is attached to the four planes of the valve rod (1) and fixed at the threaded hole of the end face of the cross lifting sleeve (9) by the bolts (3), and the adjusting cushion block (8) is used for transmitting impact force to the control seat (10), so that the difficulty degree in installation can be reduced.
Furthermore, a guide groove is formed in the lifting nut (5), the lifting nut (5) and the cross lifting sleeve (9) are matched to form a pin hole, and the guide pin (7) is inserted to prevent the lifting nut (5) from rotating.
Further, a valve rod lifting structure of anti-rotation drop its characterized in that: the valve rod (1) and the lifting nut (5) are connected through threads, so that the valve rod (1) and the lifting nut (5) can be prevented from rotating relatively, the valve rod (1) and the lifting nut (5) are matched to form an anti-rotation pin hole, an anti-rotation pin (6) is inserted into the pin hole of the valve rod (1) and the lifting nut (5), the anti-rotation pin is jointly installed in a cylindrical hole of the cross lifting sleeve (9), and the valve rod (1) of the lifting nut (5) can be guaranteed to move up and down.
Further, a valve rod lifting structure of anti-rotation drop its characterized in that: the positioning of the lifting nut (5) is completed by the screw plug (4), the outer surface of the screw plug (4) is provided with threads, the cross lifting sleeve (9) is screwed tightly with the end surface of the lifting nut (5) by the screw plug (4), the screw plug (4) is prevented from withdrawing, and the screw plug (4) is tightly pressed by the clamping block (2).
Further, a valve rod lifting structure of anti-rotation drop its characterized in that: the clamping block (2) is provided with a bolt hole, a square hole and a step plane, the clamping block (2) is of a two-half structure, four planes machined on the cylindrical surface of the valve rod (1) are identical to the square hole of the clamping block (2), the two halves of the clamping block (2) are closed and attached to the four planes of the valve rod (1), the end face of the cross lifting sleeve (9) is fixed by the bolt (3), and meanwhile, the step plane compresses the screw plug (4).
Further, a valve rod lifting structure of anti-rotation drop its characterized in that: an adjusting cushion block (8) is arranged at the top of the valve rod (1), so that installation difficulty is prevented, threads of the valve rod lifting nut (5) are directly stressed and damaged, and the adjusting cushion block (8) is tightly attached to the top of the valve rod (1).
Advantageous effects
The utility model provides a valve rod lifting structure capable of preventing rotation and falling. The beneficial effects are as follows:
1. this valve rod lifting structure that anti-rotation drops, through setting up the processing plane laminating location of the anti-rotation fixture block of two halves four sides location and valve rod, four planes evenly atress effectively suppresses the valve rod and receives the high frequency that high temperature high pressure steam excitation produced and shake rotatory, eight bolt holes of anti-rotation fixture block equipartition of two halves four sides location, the cross promotes the cover terminal surface and joins in marriage the screw hole, with eight superalloy bolts very firm fixing of two halves anti-rotation fixture block on the cross promotion sheathe in, adopt moment of torsion pretension when the bolt-up, effectively prevent the not hard up effect that the high temperature thermal stress produced to anti-rotation fixture block.
2. This valve rod lifting structure that anti-rotation drops through setting up the tight laminating of anti-rotation fixture block of two halves four sides location and promotion nut positioning screw plug, promotes nut positioning screw plug and adopts screw thread and cross to promote the cover hookup, very easily produces the screw thread phenomenon of loosening under high temperature, and the anti-rotation fixture block of two halves four sides location compresses tightly the positioning screw plug of promotion nut when preventing the rotatory of valve rod high frequency flutter, effectively prevents the not hard up spin of promotion nut positioning screw plug.
3. This valve rod lifting structure that anti-rotation drops, through setting up an anti-rotation cross pin, will prevent rotating the pinhole of crossing lifting nut and valve rod and joining in marriage, round pin axle length is slightly less than lifting nut's surface, must not influence the step screw hole that penetrates the cross lifting sleeve of lifting nut and valve rod during the assembly, lifting nut adopts threaded connection with the valve rod, and the cross pin setting is effective to prevent the screw thread loosens the valve rod and spin out phenomenon under the high temperature state.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a cross-sectional view of a valve stem lifting structure for preventing rotational misalignment;
FIG. 2 is a schematic view of the anti-rotation cross pin and the lift nut stem;
FIG. 3 is a schematic view of an anti-rotation latch
FIG. 4 is a general schematic of a stem lifting structure for preventing rotational misalignment.
Reference numerals illustrate:
the device comprises a valve rod 1, an anti-rotation clamping block 2, a high-temperature bolt 3, a screw plug 4, a lifting nut 5, an anti-rotation transverse pin 6, a guide pin 7, an adjusting cushion block 8, a cross lifting sleeve 9 and a control seat 10.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
Referring to fig. 1 to 4, the utility model provides a valve rod lifting structure capable of preventing rotation and falling, which comprises a cross lifting sleeve (9), and is characterized in that: the inside of the cross lifting sleeve (9) is provided with a cylindrical step threaded hole, a valve rod (1), a screw plug (4), a lifting nut (5) and an anti-rotation transverse pin (6), an adjusting cushion block (8) is arranged in the cross lifting sleeve (9), the lifting nut (5) is used for being connected with the cross lifting sleeve (9) as the valve rod (1), the outer circle of the lifting nut (5) is in clearance fit with a hole at the upper part of the cross lifting sleeve, a guide groove is formed in the outer circle of the lifting nut (5), a guide pin (7) is arranged on the cross lifting sleeve (9) to prevent the lifting nut (5) from rotating, and the lifting nut (5) can move up and down during combined installation; the positioning of the lifting nut is completed by a screw plug (4), and threads are formed on the surface of the screw plug (4) and are matched and screwed with the internal threads of a cross lifting sleeve (9); the end face of the cross lifting sleeve (9) is provided with a threaded hole, four planes are machined on the cylindrical surface of the valve rod (1), the anti-rotation clamping block (2) is attached to the four planes of the valve rod (1), the eight high-temperature bolts (3) are fixed at the threaded hole of the end face of the cross lifting sleeve (9), the adjusting cushion block (8) can ensure that the threads of the valve rod (1) are not stressed when the valve is closed, the impact force generated when the valve is closed is directly transmitted to the operating seat (10), the service life of a high-temperature high-pressure speed regulation main valve is effectively prolonged, and the gap between the end face of the valve rod (1) and the cross lifting sleeve (9) is adjusted through the adjusting cushion block (8).
The working principle of the utility model is as follows:
a cylindrical step deep hole is machined in a cross lifting sleeve (9), threads are formed in a larger aperture of a lower step, four planes are machined on the cylindrical surface of a valve rod (1), a longitudinal guide groove is formed in the outer circular surface of a lifting nut (5), after the valve rod (1) is connected with the lifting nut (5) through threads, an anti-rotation transverse pin (6) is inserted into a pin hole, after an adjusting cushion block (8) is installed, the anti-rotation transverse pin is integrally inserted into the cylindrical step hole of the cross lifting sleeve (9), a screw plug (4) is screwed with the cross lifting sleeve (9) through threaded fit, a pin hole inserting guide pin (7) is arranged at the position of the outer circular guide groove of the lifting nut (5), four planes matched with the valve rod (1) are integrally machined on an anti-rotation clamping block (2), a step plane matched with the end face of the screw plug (4) is integrally machined, the anti-rotation clamping block (2) is divided into two halves, after the adjusting positioning of the anti-rotation clamping block (2) is tightly contacted with the screw plug (4) of the valve rod (1), the cross lifting sleeve (9) is integrally inserted into a bolt hole, the high-temperature bolt (3) is formed, and high-temperature pre-tightening torque is carried out by the high-temperature bolt (3).
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (6)
1. The utility model provides a valve rod lifting structure that anti-rotation drops, includes cross lifting sleeve (9), its characterized in that: the inside of the cross lifting sleeve (9) is provided with a cylindrical step threaded hole, a valve rod (1), a screw plug (4), a lifting nut (5) and an anti-rotation transverse pin (6), an adjusting cushion block (8) is arranged in the cross lifting sleeve (9), the lifting nut (5) is used for being connected with the cross lifting sleeve (9) as the valve rod (1), the outer circle of the lifting nut (5) is in clearance fit with a hole at the upper part of the cross lifting sleeve, a guide groove is formed in the outer circle of the lifting nut (5), and a guide pin (7) is arranged on the cross lifting sleeve (9) to prevent the lifting nut (5) from rotating and ensure that the lifting nut (5) can move up and down; the positioning of the lifting nut is completed by a screw plug (4), and threads are formed on the surface of the screw plug (4) and are matched and screwed with the internal threads of a cross lifting sleeve (9); the end face of the cross lifting sleeve (9) is provided with a threaded hole, the cylindrical surface of the valve rod (1) is provided with four planes, the clamping block (2) is attached to the four planes of the valve rod (1) and fixed to the threaded hole of the end face of the cross lifting sleeve (9) through the bolts (3), the adjusting cushion block (8) is attached to the end face of the valve rod (1), impact force is conducted to the control seat (10), and meanwhile the difficulty in installation can be reduced.
2. The anti-rotational drop valve stem lifting structure of claim 1, wherein: the lifting nut (5) is provided with a guide groove, the lifting nut (5) and the cross lifting sleeve (9) are matched with a pin hole, and the guide pin (7) is inserted to prevent the lifting nut (5) from rotating.
3. The anti-rotational drop valve stem lifting structure of claim 1, wherein: the valve rod (1) adopts threaded connection with the lifting nut (5), in order to prevent relative rotation of the valve rod (1) and the lifting nut (5), the valve rod (1) and the lifting nut (5) are matched with anti-rotation pin holes, the anti-rotation transverse pin (6) is inserted into the pin holes of the valve rod (1) and the lifting nut (5), and is jointly installed in the cylindrical holes of the cross lifting sleeve (9), and the valve rod (1) of the lifting nut (5) is guaranteed to move up and down.
4. The anti-rotational drop valve stem lifting structure of claim 1, wherein: the positioning of the lifting nut (5) is completed by the screw plug (4), the outer surface of the screw plug (4) is provided with threads, the cross lifting sleeve (9) is screwed tightly with the end surface of the lifting nut (5) by the screw plug (4), the screw plug (4) is prevented from withdrawing, and the screw plug (4) is tightly pressed by the clamping block (2).
5. The anti-rotational drop valve stem lifting structure of claim 1, wherein: the clamping block (2) is provided with a bolt hole, a square hole and a step plane, the clamping block (2) is of a two-half structure, four planes machined on the cylindrical surface of the valve rod (1) are identical to the square hole of the clamping block (2), the two halves of the clamping block (2) are closed and attached to the four planes of the valve rod (1), the end face of the cross lifting sleeve (9) is fixed by the bolt (3), and meanwhile, the step plane compresses the screw plug (4).
6. The anti-rotational drop valve stem lifting structure of claim 1, wherein: an adjusting cushion block (8) is arranged at the top of the valve rod (1), so that the installation is difficult, the threads of the valve rod lifting nut (5) are directly stressed and damaged, and the adjusting cushion block (8) is tightly attached to the end face of the top of the valve rod (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320457103.5U CN219888872U (en) | 2023-03-13 | 2023-03-13 | Valve rod lifting structure capable of preventing rotation from falling off |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320457103.5U CN219888872U (en) | 2023-03-13 | 2023-03-13 | Valve rod lifting structure capable of preventing rotation from falling off |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219888872U true CN219888872U (en) | 2023-10-24 |
Family
ID=88397880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320457103.5U Active CN219888872U (en) | 2023-03-13 | 2023-03-13 | Valve rod lifting structure capable of preventing rotation from falling off |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219888872U (en) |
-
2023
- 2023-03-13 CN CN202320457103.5U patent/CN219888872U/en active Active
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