CN114923012B - Control method of ball valve - Google Patents
Control method of ball valve Download PDFInfo
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- CN114923012B CN114923012B CN202210861943.8A CN202210861943A CN114923012B CN 114923012 B CN114923012 B CN 114923012B CN 202210861943 A CN202210861943 A CN 202210861943A CN 114923012 B CN114923012 B CN 114923012B
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- valve rod
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- valve
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000006073 displacement reaction Methods 0.000 claims abstract description 52
- 238000013507 mapping Methods 0.000 claims description 14
- 238000012937 correction Methods 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 4
- 239000000945 filler Substances 0.000 description 3
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K29/00—Arrangements for movement of valve members other than for opening and closing the valve, e.g. for grinding-in, for preventing sticking
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0647—Spindles or actuating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0647—Spindles or actuating means
- F16K5/0652—Spindles or actuating means for remote operation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to a control method of a ball valve, which comprises the following steps: s1: detecting a lag angle generated in the rotation process of the valve rod; s2: judging whether the lag angle is larger than a preset threshold value or not, and if the lag angle is larger than the preset threshold value, executing a step S3; otherwise, continuing to execute the step S1; s3: controlling a power device to push a driving rod to move along the axial direction of the valve rod by a first preset displacement according to the detected lag angle, and continuously receiving the detected lag angle; s4: after the step S3 is executed, if the hysteresis angle is still detected to exist, continuously controlling the power device to push the driving rod to move along the axial direction of the valve rod for a first preset displacement; s5: and repeating the step S4 until the lag angle is not detected, and controlling the power device to stop acting. Thereby, the hysteresis angle of the ball valve can be effectively reduced or eliminated in a short time or without assembling and disassembling the ball valve.
Description
Technical Field
The invention belongs to the field of valves, and particularly relates to a control method of a ball valve.
Background
The high-pressure ball valve is widely applied to industries such as petroleum refining, long-distance pipelines, chemical engineering and the like, is mainly used as a valve for cutting off, distributing and changing the flow direction of a medium in a pipeline, and is opened or closed by rotating a valve rod. In such a ball valve, when the valve stem is rotated, a driving force is generated at a contact surface between the valve stem and the ball valve body, and the ball valve body is rotated against a resistance generated by a fluid pressure to open the valve. During rotation of the ball valve body, high stress concentrations occur at the opposite corners of the valve stem to ball valve body interface. In the frequent opening and closing process of the ball valve body, the relative angle of the contact surface of the valve rod and the ball valve body is easy to deform, so that a hysteresis angle is generated in the opening or closing process of the ball valve body, namely, the valve rod can rotate for a section of idle stroke and then drive the ball valve body to open or close, and the service performance of the ball valve is seriously influenced.
However, the high-pressure ball valve is mostly used in a field transportation environment with rare people, so that a maintainer cannot detect and maintain the ball valve in real time. Also, for some important ball valves in a transportation pipeline, long downtime is not allowed. Therefore, it is very important how to complete the correction of the hysteresis angle in a short time or without attaching and detaching the ball valve.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a control method of a ball valve, which can effectively reduce or eliminate the lag angle of the ball valve in a short time or under the condition of not dismounting the ball valve, and improve the service performance of the ball valve.
In order to achieve the above purpose, the invention provides the following technical scheme:
a control method of a ball valve comprises a ball valve body, a valve rod and a power device; the ball valve comprises a ball valve body, a valve rod, a filling body, a base and a driving rod, wherein the valve rod is used for driving the ball valve body to rotate; the power device is used for driving the driving rod to move axially along the valve rod and pushing the base to move axially, so that the filling body is deformed in the radial direction of the valve rod, and the lag angle between the valve rod and the ball valve body is eliminated; the control method comprises the following steps:
s1: detecting a lag angle of the valve rod in the rotating process;
s2: judging whether the lag angle is larger than a preset threshold value or not, and if the lag angle is larger than the preset threshold value, executing a step S3; otherwise, continuing to execute the step S1;
s3: controlling the power device to drive the driving rod to move along the axial direction of the valve rod by a first preset displacement according to the detected lagging angle, and continuously receiving the detected lagging angle;
s4: after the step S3 is executed, if the hysteresis angle is still detected to exist, continuing to control the power device to drive the driving rod to move the first preset displacement along the axial direction of the valve rod;
s5: and repeating the step S4 until the lag angle is not detected, and controlling the power device to stop acting.
A control method of a ball valve comprises a ball valve body, a valve rod and a power device; the ball valve comprises a valve rod, a ball valve body, a packing body, a base and a driving rod, wherein the valve rod is used for driving the ball valve body to rotate; the power device is used for driving the driving rod to move axially along the valve rod and pushing the base to move axially, so that the filling body is deformed in the radial direction of the valve rod, and the lag angle between the valve rod and the ball valve body is eliminated; the control method comprises the following steps:
s1: detecting a lag angle of the valve rod in the rotating process;
s2: judging whether the lag angle is larger than a preset threshold value or not, and if the lag angle is larger than the preset threshold value, executing a step S3; otherwise, continuing to execute the step S1;
s3: according to the detected lag angle, acquiring a predetermined displacement corresponding to the lag angle from a mapping table, multiplying the predetermined displacement by a correction coefficient to obtain a control displacement, and controlling the power device to drive the driving rod to move along the axial direction of the valve rod by the control displacement; wherein the mapping table is obtained according to a preliminary experiment;
s4: after the step S3 is executed, if the hysteresis angle is still detected to exist, the power device is continuously controlled to drive the driving rod to move along the axial direction of the valve rod for a second preset displacement;
s5: and repeating the step S4 until the lag angle is not detected, and controlling the power device to stop acting.
Preferably, if the detected lag angle is not in the predetermined mapping table, performing interpolation according to an interval in which the lag angle is located to obtain the predetermined displacement.
Preferably, the base comprises a base, a convex body is arranged on one side of the base facing the filling body, and a connecting body is arranged on the other side of the base and is abutted against the driving rod; the width at the two ends of the bulge body is larger than the width in the middle of the bulge body, the filling body comprises a guide groove which is arranged in a penetrating mode, and the bulge body is clamped in the guide groove.
Preferably, the ball valve is provided with a sensor for detecting the lag angle generated by the ball valve during use, and the control device controls the power device to move according to the received lag angle detected by the sensor.
Preferably, the protrusion disposed on the base has a curved surface shape, and a plane section connected to an end of the curved surface shape, and an equation of a cross-sectional curve of the curved surface shape is:
in the formula:Lis the length of the load bearing segment;hthe width of the guide groove in the filling body;θis the lag angle.
Compared with the prior art, the control method of the ball valve provided by the invention has the following beneficial technical effects:
1. in the invention, the filling body is arranged in the valve rod, the penetrating guide groove is arranged on the filling body, and the bulge body is arranged on the base. When the ball valve generates a lag angle in the using process, the driving rod is driven to axially move along the valve rod by controlling the power device, so that when the driving rod pushes the filling body to move downwards, the filling body expands and deforms along the radial direction of the valve rod, the bearing section of the valve rod also deforms along the radial direction of the valve rod, the bearing surface of the bearing section is fully contacted with the ball valve body at the moment, and the lag angle of the ball valve is eliminated. The ball valve provided by the invention can effectively reduce or eliminate the lag angle of the ball valve in a short time or under the condition of not dismounting the ball valve, not only solves the technical problem that the ball valve in the prior art cannot be detected and maintained in real time, improves the service performance of the ball valve, but also avoids the shutdown maintenance of an important transportation pipeline.
2. In order to effectively compensate the lag angle, the ball valve is also provided with a sensor which is used for detecting the lag angle generated by the ball valve in the using process, and the control device controls the power device to move according to the received lag angle detected by the sensor. In the specific compensation process, when a larger lag angle is detected, the power device is controlled to drive the driving rod to move by the first predetermined displacement to compensate the lag angle. And in the compensation process, as long as the lag angle is detected, the driving rod is continuously driven to move by the first preset displacement to compensate the lag angle until the lag angle is detected, so that the lag angle of the ball valve is effectively reduced or eliminated in a short time or under the condition of not disassembling and assembling the ball valve, and the service performance of the ball valve is improved.
3. In order to improve the compensation efficiency, the other control method provided by the invention adopts a mapping table between a predetermined lag angle and a displacement, firstly obtains a predetermined displacement corresponding to the lag angle from the mapping table according to the detected lag angle, and multiplies the predetermined displacement by a correction coefficient to obtain a control displacement, thereby carrying out first compensation. It is then detected whether the lag angle is still present, and the power means is then selectively controlled to move the drive rod by a second predetermined displacement to compensate for the lag angle. The method realizes remote and accurate elimination of the lag angle, simultaneously considers the efficiency and obviously saves the time of the whole control process.
4. In order to effectively eliminate the hysteresis angle in the case where the bearing section is mostly drum-shaped after the failure of the valve stem, in a preferred embodiment of the present invention, the outer shape of the convex body is designed, and the convex body is provided with a curved outer shape and a flat section connected to an end of the curved outer shape, so that the deformed portion of the bearing section can be more efficiently restored to a state where the hysteresis angle is eliminated. And the concave curved section can avoid extruding the part which is not deformed in the middle, thereby obviously improving the service performance of the ball valve.
Drawings
FIG. 1 is a schematic view of the overall structure of a high pressure ball valve;
FIG. 2 is a schematic view of a valve stem of the high pressure ball valve under force;
FIG. 3 is a schematic structural view of the high pressure ball valve of the present invention;
FIG. 4 is a partial schematic view of the high pressure ball valve of the present invention;
FIG. 5 is a partial schematic view of the high pressure ball valve of the present invention;
FIG. 6 is a partial schematic view of the high pressure ball valve of the present invention;
fig. 7 is a schematic view of the base structure of the present invention.
Wherein, the meaning of the marked symbols in the figures is as follows:
1. a valve cover; 2. a valve seat; 3. a valve body; 4. a ball valve body; 5. a top cover; 6. a valve stem; 41. a boss; 61. a base; 62. a filler; 63. a drive rod; 64. a load-bearing section; 611. a base; 612. a protrusion; 613. a linker; 614. a first contact surface; 621. a guide groove; 622. a second contact surface; 6121. a curved surface profile; 6122. a planar segment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.
Thus, the following detailed description of the embodiments of the invention is not intended to limit the scope of the invention as claimed, but is merely representative of some embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments of the present invention and the features and technical solutions thereof may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like refer to orientations or positional relationships based on those shown in the drawings, or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and such terms are used for convenience of description and simplification of the description, and do not refer to or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1-5, the present invention provides a high pressure ball valve, comprising: a valve body 3; two valve covers 1 arranged at the left end and the right end of the valve body 3; a top cover 5 disposed on the upper side of the valve body 3; the valve seat 2 and the ball valve body 4 are arranged in the valve body 3, one end of the valve seat 2 is abutted against the valve cover 1, and the other end of the valve seat 2 is abutted against the ball valve body 4; with valve rod 6 that ball valve body 4 transmission is connected, 6 one end of valve rod is inserted in ball valve body 4, and the other end is followed top cap 5 is worn out, works as the drive when valve rod 6 rotates, valve rod 6 drive ball valve body 4 winds valve seat 2 rotates, and F is the sign of valve rod atress direction.
Wherein, an installation groove is arranged in the valve rod 6, and a filling body 62, a base 61 and a driving rod 63 are sequentially arranged in the installation groove from bottom to top; the base 61 comprises a base 611, one side of the base 611 facing the filling body 62 is provided with a convex body 612, the other side is provided with a connecting body 613, and the connecting body 613 is abutted to the driving rod 63; the widths of the two ends of the protruding body 612 are greater than the width of the middle of the protruding body, the filling body 62 includes a guide groove 621 which is arranged in a penetrating manner, and the protruding body 612 is clamped in the guide groove 621; a power device (not shown in the drawings) drives the driving rod 63 to move axially along the valve rod 6, and pushes the base 61 to move axially, so that the filling body 62 expands and deforms along the radial direction of the valve rod 6, and further the bearing section 64 of the valve rod 6 deforms along the radial direction of the valve rod 6, thereby eliminating the lag angle between the valve rod 6 and the ball valve body 4. Wherein, the lag angle is the idle stroke angle rotated before the valve rod drives the ball valve body to act.
Preferably, the protruding body 612 is provided with a first contact surface 614, and the guide groove 621 is provided with a second contact surface 622, so that when the driving rod 63 pushes the base 61, the first contact surface 614 is abutted against the second contact surface 622.
In the invention, the filling body is arranged in the valve rod, the penetrating guide groove is arranged on the filling body, and the bulge body is arranged on the base, so that the width of two ends of the bulge body is larger than that of the middle part of the bulge body. When the ball valve generates a lag angle in the using process, the driving rod is driven to move axially along the valve rod by controlling the power device, so that when the driving rod pushes the filling body to move downwards, the filling body expands and deforms along the radial direction of the valve rod, the bearing section of the valve rod also deforms along the radial direction of the valve rod, the bearing surface of the bearing section is fully contacted with the ball valve body, the lag angle of the ball valve is eliminated, and the using performance of the ball valve is improved.
Preferably, referring to fig. 3 to 5, in order to ensure the bearing characteristics of the valve rod 6, a boss 41 is provided on the ball valve body 4, a groove for mounting the bearing section 64 is axially formed along the boss 41, the depth of the groove is greater than the height of the boss 41, and the ratio of the width D of the mounting groove formed in the valve rod 6 to the width D of the bearing section is 0.5 to 0.6.
The inventor finds that after the valve rod fails through long-term engineering practice, the bearing section 64 is mostly drum-shaped, and the maximum deformation occurs at the four corners of the bearing section 64, and the gaps between the four corners and the boss 41 are the most main reasons for the lag angle. Therefore, in order to avoid squeezing the undeformed portion and more efficiently return the deformed portion to the state where the hysteresis angle is eliminated, in the following preferred embodiment, the ball valve is further improved.
As shown in fig. 4-7, wherein fig. 6 shows the loading section 64 becoming drum-shaped (the filling body is not shown) after the valve stem 6 has failed, fig. 7 shows a preferred base 61 arrangement of the present invention. The protrusion 612 arranged on the base 61 has a curved surface profile 6121 and a section of a plane section 6122 connected with the end of the curved surface profile 6121, and the equation of the cross-sectional curve of the curved surface profile 6121 is as follows:
in the formula:Lis the length of the load bearing segment;hthe width of the guide groove in the filling body;θis the lag angle.
After the bearing section is changed into a drum shape in the long-term use process, the arrangement mode of the convex body provided by the invention can more efficiently recover the deformed part in the bearing section to the state of eliminating the hysteresis angle. And the concave curved section can avoid extruding the part which is not deformed in the middle, thereby obviously improving the service performance of the ball valve.
Preferably, in order to effectively eliminate the lag angle, the ball valve is further provided with a sensor (not shown) for detecting the lag angle generated during the use of the ball valve, and the control device (not shown) controls the power device to move according to the received lag angle detected by the sensor.
As previously described, the present invention provides a high pressure ball valve that is effective in reducing or eliminating the lag angle of the ball valve. In order to achieve the above object, the present invention further provides a control method of the above ball valve, the control method comprising the steps of:
s1: detecting a lag angle of the valve rod in the rotating process by using a sensor;
s2: judging whether the lag angle is larger than a preset threshold value or not, and if the lag angle is larger than the preset threshold value, executing a step S3; otherwise, continuing to execute the step S1;
s3: controlling the power device to drive the driving rod to move along the axial direction of the valve rod by a first preset displacement according to the lag angle detected by the sensor, and continuously receiving the lag angle detected by the sensor;
s4: after the step S3 is executed, if the sensor still detects that the hysteresis angle exists, continuing to control the power device to drive the driving rod to move the first predetermined displacement along the axial direction of the valve rod; preferably, the first predetermined displacement may be adjusted according to requirements such as efficiency or accuracy; for example, when it is desired to eliminate the hysteresis angle of the ball valve as quickly as possible to improve efficiency, the first predetermined displacement may be set to a greater value, giving the packing a greater radial expansion deformation at each compensation; when the control precision needs to be ensured to reduce unnecessary damage to the ball valve, the first preset displacement can be set to be a smaller value, and the filling body has smaller radial expansion deformation in each compensation;
s5: and step S4 is repeated until the sensor does not detect the lag angle, and the power device is controlled to stop acting.
In the control method, the power device is controlled to drive the driving rod to move by the first preset displacement to compensate the lag angle after the large lag angle is detected. And in the compensation process, as long as the lag angle is detected, the driving rod is continuously driven to move by the first preset displacement to compensate the lag angle until the lag angle is detected, so that the lag angle of the ball valve is effectively reduced or eliminated in a short time or under the condition of not disassembling and assembling the ball valve, and the service performance of the ball valve is improved.
According to the embodiment, the hysteresis angle of the ball valve can be effectively reduced or eliminated on the transportation pipeline in a short time or under the condition of not dismounting the ball valve, and the normal work of the transportation pipeline is ensured. However, in the above embodiment, in order to ensure that the hysteresis angle is accurately compensated by adopting a multi-time compensation method, the efficiency is relatively low, and for this reason, the present invention provides another preferred embodiment:
s1: detecting a lag angle of the valve rod in the rotating process by using a sensor;
s2: judging whether the lag angle is larger than a preset threshold value or not, and if the lag angle is larger than the preset threshold value, executing a step S3; otherwise, continuing to execute the step S1;
s3: acquiring a predetermined displacement corresponding to the lag angle from a mapping table according to the received lag angle detected by the sensor, multiplying the predetermined displacement by a correction coefficient to obtain a control displacement, and controlling the power device to drive the driving rod to move along the axial direction of the valve rod by the control displacement; wherein the mapping table is obtained according to a preliminary experiment; that is, it is determined through experiments that when the hysteresis angle is θ n, the driving rod is driven to move by a predetermined displacement Qn along the axial direction of the valve rod, so that the hysteresis angle can be eliminated.
Illustratively, the predetermined mapping table is as follows:
| lag angle | θ 1 | θ 2 | …… | θn |
| Displacement amount | Q 1 | Q 2 | …… | Qn |
Because the test working condition is inconsistent with the field use working condition, the mode of controlling the displacement is obtained by multiplying the preset displacement by the correction coefficient, and the excessive expansion of the filling body and the excessive deformation of the bearing section caused by the overlarge axial displacement of the valve rod due to the directly adopted displacement obtained by the test are avoided. Preferably, the correction factor is less than 1; preferably, the correction factor is 0.7-0.8.
Preferably, if the detected lag angle is not in the predetermined mapping table, the predetermined displacement amount is obtained by interpolation according to the section in which the lag angle is located.
S4: after the step S3 is executed, if the sensor still detects that the hysteresis angle exists, continuing to control the power device to drive the driving rod to move along the axial direction of the valve rod by a second predetermined displacement; preferably, the second predetermined displacement may be adjusted according to efficiency or accuracy requirements; for example, when it is desired to eliminate the hysteresis angle of the ball valve as quickly as possible to improve efficiency, the second predetermined displacement may be set to a greater value, giving the filler a greater radial expansion deformation at each compensation; when control accuracy needs to be ensured to reduce unnecessary damage to the ball valve, the second predetermined displacement may be set to a smaller value, and the filler body may be provided with a smaller radial expansion deformation in each compensation.
S5: and step S4 is repeated until the sensor does not detect the lag angle, and the power device is controlled to stop acting.
According to the above embodiment, a mapping table between a hysteresis angle and a displacement amount is determined in advance, and according to the detected hysteresis angle, a predetermined displacement amount corresponding to the hysteresis angle is first acquired from the mapping table, and the predetermined displacement amount is multiplied by a correction coefficient to obtain a control displacement amount, thereby performing first compensation. It is then checked whether the lagging angle is still present, and the power means is then selectively controlled to move the drive rod by the second predetermined displacement to compensate for the lagging angle. The method realizes remote and accurate elimination of the lag angle, simultaneously considers the efficiency and obviously saves the time of the whole control process.
The above embodiments are only used for illustrating the invention and not for limiting the technical solutions described in the invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above embodiments, and therefore, any modification or equivalent replacement of the present invention is made; all such modifications and variations are intended to be included herein within the scope of this disclosure and the appended claims.
Claims (8)
1. A control method of a ball valve, characterized in that: the ball valve comprises a ball valve body, a valve rod and a power device; one end of the valve rod is inserted into the ball valve body to form a bearing section, the valve rod is used for driving the ball valve body to rotate, an installation groove is formed in the valve rod, and a filling body, a base and a driving rod are sequentially arranged in the installation groove from bottom to top; the power device is used for driving the driving rod to axially move along the valve rod and pushing the base to axially move, so that the filling body is deformed along the radial direction of the valve rod, and further the bearing section of the valve rod is deformed along the radial direction of the valve rod, so that the lag angle between the valve rod and the ball valve body is eliminated; the control method comprises the following steps:
s1: detecting a lag angle of the valve rod in the rotating process;
s2: judging whether the lag angle is larger than a preset threshold value or not, and if the lag angle is larger than the preset threshold value, executing a step S3; otherwise, continuing to execute the step S1;
s3: controlling the power device to drive the driving rod to move along the axial direction of the valve rod by a first preset displacement according to the detected lagging angle, and continuously receiving the detected lagging angle;
s4: after the step S3 is executed, if the hysteresis angle is still detected to exist, continuing to control the power device to drive the driving rod to move the first preset displacement along the axial direction of the valve rod;
s5: and repeating the step S4 until the lag angle is not detected, and controlling the power device to stop acting.
2. The method of claim 1, wherein: the base comprises a base, one side of the base, facing the filling body, is provided with a convex body, the other side of the base is provided with a connecting body, and the connecting body is abutted to the driving rod; the width at the two ends of the bulge body is larger than the width in the middle of the bulge body, the filling body comprises a guide groove which is arranged in a penetrating mode, and the bulge body is clamped in the guide groove.
3. The method of claim 2, wherein: the ball valve is provided with a sensor for detecting the lag angle generated by the ball valve in the using process, and the control device controls the power device to move according to the received lag angle detected by the sensor.
4. A control method of a ball valve, characterized in that: the ball valve comprises a ball valve body, a valve rod and a power device; one end of the valve rod is inserted into the ball valve body to form a bearing section, the valve rod is used for driving the ball valve body to rotate, an installation groove is formed in the valve rod, and a filling body, a base and a driving rod are sequentially arranged in the installation groove from bottom to top; the power device is used for driving the driving rod to axially move along the valve rod and pushing the base to axially move, so that the filling body is deformed along the radial direction of the valve rod, and further the bearing section of the valve rod is deformed along the radial direction of the valve rod, so that the lag angle between the valve rod and the ball valve body is eliminated; the control method comprises the following steps:
s1: detecting a lag angle of the valve rod in the rotating process;
s2: judging whether the lag angle is larger than a preset threshold value or not, and if the lag angle is larger than the preset threshold value, executing a step S3; otherwise, continuing to execute the step S1;
s3: according to the detected lag angle, acquiring a predetermined displacement corresponding to the lag angle from a mapping table, multiplying the predetermined displacement by a correction coefficient to obtain a control displacement, and controlling the power device to drive the driving rod to move along the axial direction of the valve rod by the control displacement; wherein the mapping table is obtained according to a preliminary experiment;
s4: after the step S3 is executed, if the hysteresis angle is still detected to exist, the power device is continuously controlled to drive the driving rod to move along the axial direction of the valve rod for a second preset displacement;
s5: and repeating the step S4 until the lag angle is not detected, and controlling the power device to stop acting.
5. The method of claim 4, wherein: and if the detected lag angle is not in the predetermined mapping table, performing interpolation according to the interval of the lag angle to obtain the predetermined displacement.
6. The method of claim 5, wherein: the base comprises a base, one side of the base, facing the filling body, is provided with a convex body, the other side of the base is provided with a connecting body, and the connecting body is abutted to the driving rod; the width at the two ends of the bulge body is larger than the width in the middle of the bulge body, the filling body comprises a guide groove which is arranged in a penetrating mode, and the bulge body is clamped in the guide groove.
7. The method of claim 6, wherein: the ball valve is provided with a sensor for detecting the lag angle generated by the ball valve in the using process, and the control device controls the power device to move according to the received lag angle detected by the sensor.
8. The method of claim 7, wherein: the convex body arranged on the base is provided with a curved surface appearance and a plane section connected with the end part of the curved surface appearance, and the equation of the section curve of the curved surface appearance is as follows:
in the formula:Lis the length of the load bearing segment;hthe width of the guide groove in the filling body;θis the lag angle.
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| CN202210861943.8A CN114923012B (en) | 2022-07-22 | 2022-07-22 | Control method of ball valve |
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| CN202210861943.8A CN114923012B (en) | 2022-07-22 | 2022-07-22 | Control method of ball valve |
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| CN114923012B true CN114923012B (en) | 2022-10-25 |
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| CN114923012A (en) | 2022-08-19 |
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Address after: No. 67, Section 1, Xueshan Avenue, Dayi County, Chengdu City, Sichuan Province, 611330 Patentee after: Chengdu Chenggao Valve Co.,Ltd. Patentee after: CHENGDU CHENGFENG VALVE Co.,Ltd. Patentee after: Chengfeng FLOW-TECH Group Address before: 611330 No. 67, Gongye Avenue, Dayi County, Chengdu, Sichuan Patentee before: CHENGDU CHENG GAO VALVE Co.,Ltd. Patentee before: CHENGDU CHENGFENG VALVE Co.,Ltd. Patentee before: CHENGDU CHENGFENG FLOW-TECH GROUP Co.,Ltd. |
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