CN110925454A - Large-diameter all-welded ball valve - Google Patents

Large-diameter all-welded ball valve Download PDF

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Publication number
CN110925454A
CN110925454A CN201911402736.0A CN201911402736A CN110925454A CN 110925454 A CN110925454 A CN 110925454A CN 201911402736 A CN201911402736 A CN 201911402736A CN 110925454 A CN110925454 A CN 110925454A
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resistor
valve
valve body
ball valve
upper half
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CN110925454B (en
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严珊珊
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JIANGSU SHENGTAI VALVE Co.,Ltd.
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严珊珊
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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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
    • F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • 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
    • F16K37/0025—Electrical or magnetic means
    • F16K37/005—Electrical or magnetic means for measuring fluid parameters
    • 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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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Taps Or Cocks (AREA)

Abstract

The invention relates to the technical field of valves, and provides a large-caliber all-welded ball valve which comprises a valve body, a valve core and a valve rod, wherein the valve body is longitudinally divided into an upper half valve body and a lower half valve body, a through hole is formed in the center of the upper half valve body, the valve core is a sphere with a liquid flow hole, the valve core is wrapped in the valve body by the upper half valve body and the lower half valve body, and the valve rod penetrates through the through hole in the upper half valve body and is fixedly connected with the valve core; the upper half valve body and the lower half valve body are welded on the butt joint face, the butt joint face of the upper half valve body is provided with a boss, the butt joint face of the lower half valve body is provided with a groove, and the boss is inserted into the groove to be matched with the groove. According to the large-caliber all-welded ball valve, the boss and the groove which are matched with each other are arranged on the combined welding surface of the valve body, so that mutual positioning can be performed before welding in the process of combination, deviation errors caused by combination are avoided, matching precision is improved, welding fusion quality can be prevented from being contacted with a valve core, and the manufacturing yield is improved.

Description

Large-diameter all-welded ball valve
Technical Field
The invention relates to the technical field of valves, in particular to a large-diameter all-welded ball valve.
Background
The ball valve is a relatively common valve which controls the flow of fluid through a rotary motion switch, is mainly used for cutting off, distributing and changing the flow direction of a medium in a pipeline, is widely applied to industries such as petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmacy, water conservancy, electric power, municipal administration, steel and the like, and plays a significant role in national economy. The plug body valve core is a sphere and is provided with a cylindrical through hole or a channel passing through the axis of the valve. The ball valve has an action adjusting range of rotating 90 degrees, can be tightly closed only by operating to rotate at a small angle, and is most suitable for being used as a switch and a stop valve. The application should be aware of the environmental conditions such as temperature, pressure and fluid type.
The ball valve structurally comprises a valve body, a valve core (a ball body) and a valve rod, wherein the valve core is driven by the valve rod to rotate around the axis of the ball valve and is used for adjusting and controlling fluid. The large-caliber ball valve generally refers to a ball valve with a nominal diameter range of DN 350-DN 1200, the large-caliber ball valve can be divided into a flange connection ball valve and a welding ball valve according to the combination mode of a valve body, the valve body of the welding ball valve is combined together by a plurality of welding modes, and the precision of the valve body and a valve core is an important quality parameter of the ball valve.
When the large-caliber all-welded ball valve is manufactured, a valve core is required to be installed in a combined valve body before welding, then a welding process is carried out, and on one hand, if a melt penetrates into a welding seam to reach the valve core during welding, the valve core can not rotate in the valve body; on the other hand, due to the influence of the welding process, the matching precision of the valve body and the valve core is easily unqualified, and the yield of the large-diameter all-welded ball valve is influenced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a large-caliber all-welded ball valve which comprises a valve body, a valve core and a valve rod, wherein the valve body is longitudinally divided into an upper half valve body and a lower half valve body, a through hole is formed in the center of the upper half valve body, the valve core is a sphere with a liquid flow hole, the valve core is wrapped in the valve body by the upper half valve body and the lower half valve body, and the valve rod penetrates through the through hole in the upper half valve body and is fixedly connected with the valve core; the upper half valve body and the lower half valve body are welded on the butt joint face, the butt joint face of the upper half valve body is provided with a boss, the butt joint face of the lower half valve body is provided with a groove, and the boss is inserted into the groove to be matched with the groove.
Optionally, the distance between the boss and the groove and the inner wall of the valve body is less than half of the thickness of the valve body.
Optionally, the valve further comprises a sealing element which is arranged in the through hole of the upper half valve body around the valve rod.
Optionally, the valve further comprises a bearing, an inner ring of the bearing is connected with the valve rod in a matched mode, and an outer ring of the bearing is connected with the through hole of the upper half valve body in a matched mode.
Optionally, the lubricating oil storage device further comprises a sealing cover, the sealing cover is arranged at an outer port of the through hole of the upper half valve body after the valve rod penetrates through the sealing cover, a containing cavity is arranged between the bearing and the sealing cover, and lubricating oil is stored in the containing cavity.
Optionally, the outer surface of the valve body wrapped on the valve core is convex, so that the wall thickness of the position is larger than that of other parts of the valve body.
Optionally, the depth dimension of the liquid flow hole of the valve core is larger than the diameter of the liquid flow hole.
Optionally, the valve further comprises a rotating wheel, and the rotating wheel is fixed at the exposed end of the valve rod.
Optionally, still include drive arrangement, controller and pressure sensor, drive arrangement is connected with the valve rod transmission, be equipped with on the valve body with the communicating self-sealing needle valve of inner chamber, pressure sensor installs on self-sealing needle valve with screw-thread fit, the controller is connected with drive arrangement and pressure sensor respectively.
Optionally, the control circuit further includes a control circuit, where the control circuit includes a capacitor C1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, an amplifier F1, an amplifier F2, a diode D1, a diode D2, a transistor V1, a transistor V2, a transistor V3, a transistor V4, and a comparator B1; wherein the content of the first and second substances,
one end of a resistor R5 is connected with the positive electrode of a power supply, the other end of a resistor R5 is connected with a resistor R4 in series, the other end of a resistor R4 is connected with a resistor R3, the other end of a resistor R3 is connected with one end of a resistor R2, the other end of a resistor R2 is connected with the resistor R1 in series, the other end of a resistor R1 is grounded, one end of a capacitor C1 is connected with one end of a resistor R6, and the other end of the capacitor C1 is connected with the ground;
a voltage signal P1 is connected with a non-inverting input end of an amplifier F1, an inverting input end of an amplifier F1 is connected with one end of a resistor R6, an output end of the amplifier F1 is connected with an anode of a diode D1, one end of a resistor R9 is also connected with an anode of a diode D1, the other end of the resistor R9 is connected with one end of a resistor R10, the other end of the resistor R10 is grounded, the other end of the resistor R6 is connected with a collector of a triode V2, a base of a triode V2 is connected with one end of the resistor R10, and an emitter of the triode V2 is grounded;
a voltage signal P2 is connected with an inverting input end of an amplifier F2, a non-inverting input end of the amplifier F2 is connected with one end of a resistor R3, an output end of the amplifier F2 is connected with an anode of a diode D2, one end of a resistor R12 is also connected with an anode of a diode D2, the other end of a resistor R12 is connected with one end of a resistor R11, the other end of a resistor R11 is grounded, one end of a resistor R14 is connected with one end of a resistor R13 in series, the other end of a resistor R14 is connected to a direct current power supply Q1, the other end of a resistor R13 is grounded, a base of a triode V3 is connected with one end of a resistor R11, a collector of a triode V3 is also connected with one end of a resistor R14, an emitter of a triode V3 is grounded, a base of a triode V4 is connected with one end of the R4;
the cathodes of the diodes D1 and D2 are connected, one end of the resistor R7 is connected with one end of the resistor R8 in series, the other end of the resistor R7 is connected with the cathodes of the diodes D1 and D2, the other end of the resistor R8 is grounded, the base of the triode V1 is connected with one end of the resistor R7, the collector of the triode V1 is connected with the input end of the comparator B1, and the emitter of the triode V1 is grounded.
Optionally, the controller includes a motherboard and a processor disposed on the motherboard, the pressure sensor is connected to the motherboard, the processor receives a pressure signal transmitted by the pressure sensor through the motherboard, and the processor is further connected to the driving device;
the driving device is used for driving the valve rod to rotate according to a preset rotation angle on the basis of the current rotation angle according to the pressure signal received by the processor, so as to realize the flow regulation of the fluid, and the driving device comprises the following steps:
step A1: determining the relation between the current rotation angle omega of the valve rod and the flow demand value S according to the formula (1);
Figure BDA0002347874170000031
wherein, oc represents a proportional sign; u represents an average voltage value corresponding to the pressure signal detected by the pressure sensor; u. of0The initial pressure value corresponding to the pressure signal detected by the pressure sensor is represented when the valve rod is at the position with the rotation angle of 0 degrees; u. of1The pressure sensor is used for detecting the pressure signal of the valve rod at the position of which the rotating angle is 90 degrees; n represents the total number of angular adjustments of the valve stem during the liquid flow; thetaiRepresenting the i-th angular adjustment of the valve stem in n adjustments;
step A2: calculating a flow detection value Q passing through the ball valve according to formula (2);
Figure BDA0002347874170000032
wherein P represents a differential pressure value of a pressure signal acquired by the pressure sensor; ρ represents the density of the liquid flowing through the ball valve; g represents the gravitational acceleration; r represents the local resistance of the ball valve;
step A3: correcting the flow detection value obtained by calculation in the step A2 according to a formula (3) to obtain a corrected flow detection value Q';
Figure BDA0002347874170000041
wherein, Δ uiA correction factor representing a pressure value corresponding to the ith angle adjustment of the n adjustments; lambda [ alpha ]minRepresents the minimum drive correction factor of the drive device in n adjustments; lambda [ alpha ]maxRepresents the maximum drive correction factor of the drive unit in n adjustments; xiThe pressure value of the liquid flowing through the ball valve after i times of adjustment is represented; xnThe pressure value of the liquid flowing through the ball valve after n times of adjustment is represented; x1Indicating the pressure value of the liquid flowing through the ball valve after the initial adjustment;
Figure BDA0002347874170000042
a ball valve correction factor indicative of liquid flow through the ball valve; min { } represents a minimum function;
if the corrected flow detection value Q' is smaller than the first threshold value of the flow demand value S, controlling the valve rod to rotate according to a preset increased rotation angle on the basis of the current rotation angle;
if the corrected flow detection value Q' is larger than a second threshold value of the flow demand value S, controlling the valve rod to rotate according to a preset rotation reducing angle on the basis of the current rotation angle;
when the corrected flow rate detection value Q' is within the range from the first threshold value to the second threshold value of the flow rate demand value S, the valve stem is controlled to maintain the current rotation angle.
According to the large-caliber all-welded ball valve, the boss and the groove which are matched with each other are arranged on the combined welding surface of the valve body, so that mutual positioning can be performed before welding in the process of combination, deviation errors caused by combination are avoided, matching precision and efficiency are improved, poor contact caused by penetration of molten materials along the combined welding surface and a valve core in the process of welding can be avoided, and the manufacturing yield is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a front sectional view of an embodiment of a large diameter all welded ball valve of the present invention;
FIG. 2 is a top view of the embodiment of FIG. 1;
FIG. 3 is a cross-sectional view A-A of the embodiment of FIG. 2;
FIG. 4 is a cross-sectional view of another embodiment;
FIG. 5 is a front cross-sectional view of another embodiment of a large diameter all welded ball valve of the present invention;
FIG. 6 is a top view of the embodiment of FIG. 5;
fig. 7 is a schematic diagram of a control circuit of an alternative embodiment of a large-caliber all-welded ball valve with a driving device.
In the figure: 1-valve body, 2-valve core, 3-valve rod, 4-sealing element, 5-sealing cover, 6-rotating wheel, 7-driving device, 8-controller, 9-pressure sensor, 10-self-sealing needle valve, 11-upper half valve body, 12-lower half valve body, 13-through hole, 14-groove and 15-boss.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
As shown in fig. 1, 2 and 3, an alternative embodiment of a large-caliber all-welded ball valve of the present invention includes a valve body 1, a valve core 2 and a valve rod 3, wherein the valve body 1 is longitudinally (axially) divided into an upper half valve body 11 and a lower half valve body 12, a through hole 13 is arranged at the center of the upper half valve body 11, the valve core 2 is a sphere with a liquid flow hole, the valve core 2 is wrapped in the valve body 1 by the upper half valve body 11 and the lower half valve body 12, and the valve rod 3 passes through the through hole 13 on the upper half valve body 11 and is fixedly connected with the valve core 2; the upper half valve body 11 and the lower half valve body 12 are welded on the butt joint surface, the butt joint surface of the upper half valve body 11 is provided with a boss 15, the butt joint surface of the lower half valve body 12 is provided with a groove 14, and the boss 15 is inserted into the groove 14 to be matched with the groove. The valve body, the valve core and the valve rod are all made of metal.
The working principle of the technical scheme is as follows: when the valve rod is rotated to drive the valve core to synchronously rotate until the through hole of the valve core is communicated with the inner cavity of the valve body, fluid can flow from one end of the ball valve to the other end; when the valve rod is rotated to drive the valve core to synchronously rotate until the through hole of the valve core is not communicated with the inner cavity of the valve body, the valve core isolates the fluid at the two ends of the ball valve, and the fluid is prevented from flowing.
The beneficial effects of the above technical scheme are: through the boss and the recess of mutually supporting of combination weld face setting at its valve body, fix a position each other when can be used to the combination before the welding, the melting matter when can also avoid the welding arouses badly along the infiltration of combination weld face and case contact. The valve body combination is prevented from deviating errors during the manufacture of the large-caliber all-welded ball valve, and the matching precision, the manufacturing efficiency and the yield are improved.
In one embodiment, as shown in fig. 1, the large-caliber all-welded ball valve further comprises a sealing member 4, a bearing, a sealing cover 5 and a rotating wheel 6, wherein the sealing member 4 is arranged in a through hole 13 of the upper half valve body 11 around the valve rod 3; the inner ring of the bearing is connected with the valve rod 3 in a matching way, and the outer ring of the bearing is connected with the through hole 13 of the upper half valve body 11 in a matching way; the sealing cover 5 is arranged at the outer port of the through hole 13 of the upper half valve body 11 after the valve rod 3 penetrates through the through hole; a containing cavity is arranged between the bearing and the sealing cover 5, and lubricating oil is stored in the containing cavity; the sealing element 4 is close to the valve core, and the bearing is close to the outer port of the through hole 13, and a sealing bearing can be adopted to increase the sealing property; the rotating wheel 6 is fixed at the exposed end of the valve rod 3. The sealing element may be made of rubber, nylon or teflon.
The working principle of the technical scheme is as follows: the mechanical sealing mode is adopted to seal the gap between the valve rod and the valve body, and lubricating oil is stored at the upper end of the bearing to lubricate the valve rod of the rotating part.
The beneficial effects of the above technical scheme are: the sealing member can prevent that fluid from leaking along the valve rod border, adds and establishes the torsion that the bearing reduces rotation valve rod switch valve needs, and the closing cap can prevent that sealing member and bearing from droing inefficacy, increases the lubricating oil and holds the chamber, prevents to take place valve operation dumb or by the card dead, prolongs the life of ball valve, and the runner conveniently carries out switch valve switch operation.
In one embodiment, the outer surface of the valve body 1 of the large-caliber all-welded ball valve, which is wrapped by the valve core 2, is provided with a bulge, so that the wall thickness of the valve body 1 at the position of the valve core 2 is greater than the wall thickness of other parts of the valve body 1; the depth of the liquid flow hole of the valve core 2 is larger than the diameter of the liquid flow hole; the distance between the boss 15 and the groove 14 and the inner wall of the valve body 1 is less than half of the thickness of the valve body 1, as shown in fig. 3 and 4, the boss 15 and the groove 14 are arranged at the inner wall of the valve body 1 in fig. 3, and the boss 15 and the groove 14 are arranged at the position close to the inner wall of the valve body 1 in fig. 4.
The working principle of the technical scheme is as follows: the bearing strength of the valve body is directly related to the wall thickness of the valve body, and the thickness of the valve body is in direct proportion to the bearing strength under the same material.
The beneficial effects of the above technical scheme are: the bearing strength of the valve body, the welding and the valve core is increased, the service life is prolonged, the boss and the groove are arranged at the position close to the inner wall as much as possible, the welding connection area is reserved to be larger, and the welding is firmer.
The large-diameter all-welded ball valve shown in fig. 5 and 6 includes a valve body 1, a valve core 2, a valve rod 3, a driving device 7, a controller 8 and a pressure sensor 9, wherein the valve body 1 is longitudinally (axially) divided into an upper half valve body 11 and a lower half valve body 12, a through hole 13 is arranged at the center of the upper half valve body 11, the valve core 2 is a sphere with a liquid flow hole, the valve core 2 is wrapped in the valve body 1 by the upper half valve body 11 and the lower half valve body 12, and the valve rod 3 passes through the through hole 13 on the upper half valve body 11 and is fixedly connected with the valve core 2; the upper half valve body 11 and the lower half valve body 12 are welded on the butt joint surface, the butt joint surface of the upper half valve body 11 is provided with a boss 15, the butt joint surface of the lower half valve body 12 is provided with a groove 14, and the boss 15 is inserted into the groove 14 to be matched with the groove 14; the driving device 7 is in transmission connection with the valve rod 3, the driving device 7 can adopt a motor, the controller 8 is fixedly connected with the driving device 7 through bolts, the front part and the rear part of a valve core on the valve body 1 are respectively provided with a self-sealing needle valve 10 communicated with an inner cavity, the pressure sensor 9 is installed on the self-sealing needle valve 10 in a threaded fit manner, and the controller 8 is respectively electrically connected with the driving device 7 and the pressure sensor 9. The switch size automatic adjustment can be realized to the circular telegram of heavy-calibre all-welded ball valve in this embodiment.
The working principle of the technical scheme is as follows: the valve rod is driven to rotate by the driving device, so that the valve core at the inner end of the valve rod synchronously rotates, and the electric opening and closing of the ball valve are realized. The controller can be remotely accessed to the control system to realize remote control, which is especially important in places where some people cannot operate.
The beneficial effects of the above technical scheme are: the labor is saved, the operation is more convenient and accurate, and the labor intensity of workers is reduced.
In one embodiment, the controller 8 includes a main board and a processor disposed on the main board, the pressure sensor 9 is connected to the main board, the processor receives the pressure signal transmitted by the pressure sensor 9 through the main board, and the processor is further connected to the driving device 7;
the driving device 7 is configured to drive the valve rod 3 to rotate according to a preset rotation angle on the basis of a current rotation angle according to the pressure signal received by the processor, so as to adjust a flow rate of a fluid (liquid), and includes:
step A1: determining the relation between the current rotation angle omega of the valve rod 3 and the flow demand value S according to the formula (1);
Figure BDA0002347874170000071
wherein, oc represents a proportional sign; u represents an average voltage value corresponding to the pressure signal detected by the pressure sensor; u. of0The initial pressure value corresponding to the pressure signal detected by the pressure sensor is represented when the valve rod is at the position with the rotation angle of 0 degrees; u. of1The pressure sensor is used for detecting the pressure signal of the valve rod at the position of which the rotating angle is 90 degrees; n represents the total number of angular adjustments of the valve stem during the liquid flow; thetaiRepresenting the i-th angular adjustment of the valve stem in n adjustments;
among them, for example: when the current valve rod rotation angle omega is 0 degree, the flow demand value S corresponding to the valve closing flow is 0, and when the current valve rod rotation angle omega is 90 degrees, the flow demand value S corresponding to the valve flow is maximum.
Step A2: calculating a flow detection value Q passing through the ball valve according to formula (2);
Figure BDA0002347874170000081
wherein, P represents the pressure difference value of the pressure signal obtained by the pressure sensor, namely the pressure difference value detected by two pressure sensors arranged at two ends of a valve core of the ball valve; ρ represents the density of the liquid flowing through the ball valve; g represents the gravitational acceleration; r represents the local resistance of the ball valve;
step A3: correcting the flow detection value obtained by calculation in the step A2 according to a formula (3) to obtain a corrected flow detection value Q';
Figure BDA0002347874170000082
wherein, Δ uiA correction factor representing a pressure value corresponding to the ith angle adjustment in the n times of adjustment, wherein the correction factor of the pressure value is preset, and different pressure values correspond to correction factors of different pressure values; lambda [ alpha ]minRepresents the minimum drive correction factor of the drive device in n adjustments; lambda [ alpha ]maxRepresents the maximum drive correction factor of the drive unit in n adjustments; the driving correction factors are preset, and different pressure values correspond to different driving correction factors; xiThe pressure value of the liquid flowing through the ball valve after i times of adjustment is represented; xnThe pressure value of the liquid flowing through the ball valve after n times of adjustment is represented; x1Indicating the pressure value of the liquid flowing through the ball valve after the initial adjustment;
Figure BDA0002347874170000083
a ball valve correction factor representing the flow of liquid through the ball valve, the ball valve correction factor being preset in advance according to the type of the liquid; min { } represents a minimum function;
if the corrected flow detection value Q' is smaller than the first threshold value of the flow demand value S, controlling the valve rod to rotate according to a preset increased rotation angle on the basis of the current rotation angle;
if the corrected flow detection value Q' is larger than a second threshold value of the flow demand value S, controlling the valve rod to rotate according to a preset rotation reducing angle on the basis of the current rotation angle;
when the corrected flow rate detection value Q' is within the range from the first threshold value to the second threshold value of the flow rate demand value S, the valve stem is controlled to maintain the current rotation angle.
If the corrected flow detection value Q' is smaller than the first threshold value of the flow demand value S, controlling the valve rod to rotate according to the preset increased rotation angle on the basis of the current rotation angle;
if the corrected flow detection value Q' is larger than a second threshold value of the flow demand value S, controlling the valve rod to rotate according to a preset rotation reducing angle on the basis of the current rotation angle;
when the corrected flow rate detection value Q' is within the range from the first threshold value to the second threshold value of the flow rate demand value S, the valve stem is controlled to maintain the current rotation angle.
The method can be implemented as follows: and if the flow rate detection value is less than 95% of the flow rate demand value, the control valve rod is increased by 5% of the rotation angle, if the flow rate detection value is greater than 105% of the flow rate demand value, the control valve rod is decreased by 5% of the rotation angle, and when the flow rate detection value is within the range of 95% to 105% of the flow rate demand value, the valve rod is kept in the current state.
The working principle of the technical scheme is as follows: and a reasonable algorithm is constructed to automatically adjust the valve rod corresponding to the large-caliber all-welded ball valve so as to accurately control the flow of the fluid.
Wherein, a communication interface can be arranged for remote connection control.
The beneficial effects of the above technical scheme are: through setting up drive arrangement and controller, be convenient for realize the rotation of intelligent control valve rod, be convenient for acquire the flow value through formula (1), (2), (3) to revise the flow value and handle, and then further realize the accurate control to valve rod rotation angle, and adopt this heavy-calibre all-welded ball valve can make pipeline fluid flow control more accurate, avoid taking place the flow can not satisfy the requirement or exceed the condition that the demand caused the waste and take place.
In an alternative embodiment of the large-caliber all-welded ball valve with the driving device as shown in fig. 7, the control circuit is connected with a capacitor C1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, an amplifier F1, an amplifier F2, a diode D1, a diode D2, a transistor V1, a transistor V2, a transistor V3, a transistor V4 and a comparator B1 as shown in the figure;
one end of a resistor R5 is connected with the positive electrode of a power supply, the other end of a resistor R5 is connected with a resistor R4 in series, the other end of a resistor R4 is connected with a resistor R3, the other end of a resistor R3 is connected with one end of a resistor R2, the other end of a resistor R2 is connected with a resistor R1 in series, the other end of a resistor R1 is grounded, one end of a capacitor C1 is connected with one end of a resistor R6, and the other end of the capacitor C1 is connected with the ground;
the voltage signal P1 is connected with a non-inverting input end of an amplifier F1, an inverting input end of an amplifier F1 is connected with one end of a resistor R6, an output end of the amplifier F1 is connected with an anode of a diode D1, one end of a resistor R9 is also connected with an anode of a diode D1, the other end of the resistor R9 is connected with one end of a resistor R10, the other end of the resistor R10 is grounded, the other end of R6 is connected with a collector of a triode V2, a base of a triode V2 is connected with one end of the resistor R10, and an emitter of the triode V2 is grounded;
the voltage signal P2 is connected with the inverting input end of an amplifier F2, the non-inverting input end of the amplifier F2 is connected with one end of a resistor R3, the output end of the amplifier F2 is connected with the anode of a diode D2, one end of a resistor R12 is also connected with the anode of a diode D2, the other end of a resistor R12 is connected with one end of a resistor R11, the other end of a resistor R11 is grounded, one end of a resistor R14 is connected with one end of a resistor R13 in series, the other end of a resistor R14 is connected to a direct current power supply Q1, the other end of a resistor R13 is grounded, the base of a triode V3 is connected with one end of a resistor R11, the collector of a triode V3 is also connected with one end of a resistor R14, the emitter of a triode V3 is grounded, the base of a triode V4 is connected with one end of the R4, the collector;
the cathode of each of the diodes D1 and D2 is connected, one end of the resistor R7 is connected in series with one end of the resistor R8, the other end of the resistor R7 is connected with the cathode of the diodes D1 and D2, the other end of the resistor R8 is grounded, the base of the triode V1 is connected with one end of the resistor R7, the collector of the triode V1 is connected with the input end of the comparator B1 (for example, UC3842 is the comp pin), the emitter of the triode V1 is grounded, and the triodes are both NPN-type;
the working principle of the technical scheme is as follows: the collected signal is preprocessed by an amplifier, interference signals are filtered by a capacitor,
the beneficial effects of the above technical scheme are: the control circuit is flexible in design, the influence of deviation caused by interference signals is eliminated, and the control precision and stability are improved.
The manufacturing process flow of the large-caliber all-welded ball valve can comprise the following steps:
s10, manufacturing an upper half valve body, a lower half valve body, a valve core, a sealing cover and a valve rod respectively;
s20, assembling the upper half valve body, the valve core and the valve rod together;
s30, aligning the butt seam of the upper half valve body and the lower half valve body, positioning by the boss and the groove, and pressing;
s40, butt seam welding of the upper half valve body and the lower half valve body is carried out;
and S50, welding surface finishing, installing a sealing element, a bearing and a sealing cover, installing a rotating wheel in a manual mode, installing a driving device, a controller and a pressure sensor in an automatic mode, wiring and carrying out anti-corrosion treatment.
The working principle of the technical scheme is as follows: the positioning is carried out through the arranged lug boss and the groove, and meanwhile poor contact between the melting material and the valve core during welding is prevented.
The beneficial effects of the above technical scheme are: the manufacturing yield of the large-diameter all-welded ball valve is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The large-caliber all-welded ball valve is characterized by comprising a valve body, a valve core and a valve rod, wherein the valve body is longitudinally divided into an upper half valve body and a lower half valve body, a through hole is formed in the center of the upper half valve body, the valve core is a sphere with a liquid flow hole, the valve core is wrapped in the valve body by the upper half valve body and the lower half valve body, and the valve rod penetrates through the through hole in the upper half valve body and is fixedly connected with the valve core; the upper half valve body and the lower half valve body are welded on the butt joint face, the butt joint face of the upper half valve body is provided with a boss, the butt joint face of the lower half valve body is provided with a groove, and the boss is inserted into the groove to be matched with the groove.
2. The heavy-calibre all welded ball valve of claim 1, wherein the distance between the boss and the groove and the inner wall of the valve body is less than half the thickness of the valve body.
3. The large diameter all welded ball valve of claim 1, further comprising a seal disposed within the through bore of the upper valve body about the valve stem.
4. The large-caliber all-welded ball valve according to claim 3, further comprising a bearing, wherein an inner ring of the bearing is connected with the valve rod in a matching manner, and an outer ring of the bearing is connected with the through hole of the upper half valve body in a matching manner.
5. The large-caliber all-welded ball valve according to claim 4, further comprising a sealing cover, wherein the sealing cover is arranged at an outer port of the through hole of the upper half valve body after the valve rod penetrates through the sealing cover, a containing cavity is arranged between the bearing and the sealing cover, and lubricating oil is stored in the containing cavity.
6. The large-caliber all-welded ball valve according to claim 1, wherein the outer surface of the valve body where the valve core is wrapped is convex, so that the wall thickness of the position is larger than that of other positions of the valve body.
7. The large diameter all welded ball valve of claim 1, wherein the depth dimension of the flow bore of the valve element is greater than the diameter of the flow bore.
8. The large-caliber all-welded ball valve according to any one of claims 1 to 7, further comprising a driving device, a controller and a pressure sensor, wherein the driving device is in transmission connection with the valve rod, the valve body is provided with a self-closing valve communicated with the inner cavity, the pressure sensor is installed on the self-closing valve in a threaded fit manner, and the controller is respectively connected with the driving device and the pressure sensor.
9. The large-caliber all-welded ball valve according to claim 8, further comprising a control circuit, wherein the control circuit comprises a capacitor C1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, an amplifier F1, an amplifier F2, a diode D1, a diode D2, a transistor V1, a transistor V2, a transistor V3, a transistor V4 and a comparator B1; wherein the content of the first and second substances,
one end of a resistor R5 is connected with the positive electrode of a power supply, the other end of a resistor R5 is connected with a resistor R4 in series, the other end of a resistor R4 is connected with a resistor R3, the other end of a resistor R3 is connected with one end of a resistor R2, the other end of a resistor R2 is connected with the resistor R1 in series, the other end of a resistor R1 is grounded, one end of a capacitor C1 is connected with one end of a resistor R6, and the other end of the capacitor C1 is connected with the ground;
a voltage signal P1 is connected with a non-inverting input end of an amplifier F1, an inverting input end of an amplifier F1 is connected with one end of a resistor R6, an output end of the amplifier F1 is connected with an anode of a diode D1, one end of a resistor R9 is also connected with an anode of a diode D1, the other end of the resistor R9 is connected with one end of a resistor R10, the other end of the resistor R10 is grounded, the other end of the resistor R6 is connected with a collector of a triode V2, a base of a triode V2 is connected with one end of the resistor R10, and an emitter of the triode V2 is grounded;
a voltage signal P2 is connected with an inverting input end of an amplifier F2, a non-inverting input end of the amplifier F2 is connected with one end of a resistor R3, an output end of the amplifier F2 is connected with an anode of a diode D2, one end of a resistor R12 is also connected with an anode of a diode D2, the other end of a resistor R12 is connected with one end of a resistor R11, the other end of a resistor R11 is grounded, one end of a resistor R14 is connected with one end of a resistor R13 in series, the other end of a resistor R14 is connected to a direct current power supply Q1, the other end of a resistor R13 is grounded, a base of a triode V3 is connected with one end of a resistor R11, a collector of a triode V3 is also connected with one end of a resistor R14, an emitter of a triode V3 is grounded, a base of a triode V4 is connected with one end of the R4;
the cathodes of the diodes D1 and D2 are connected, one end of the resistor R7 is connected with one end of the resistor R8 in series, the other end of the resistor R7 is connected with the cathodes of the diodes D1 and D2, the other end of the resistor R8 is grounded, the base of the triode V1 is connected with one end of the resistor R7, the collector of the triode V1 is connected with the input end of the comparator B1, and the emitter of the triode V1 is grounded.
10. The large-caliber all-welded ball valve according to claim 8, wherein the controller comprises a main board and a processor arranged on the main board, the pressure sensor is connected with the main board, the processor receives a pressure signal transmitted by the pressure sensor through the main board, and the processor is further connected with the driving device;
the driving device is used for driving the valve rod to rotate according to a preset rotation angle on the basis of the current rotation angle according to the pressure signal received by the processor, so as to realize the flow regulation of the fluid, and the driving device comprises the following steps:
step A1: determining the relation between the current rotation angle omega of the valve rod and the flow demand value S according to the formula (1);
Figure FDA0002347874160000031
wherein, oc represents a proportional sign; u represents an average voltage value corresponding to the pressure signal detected by the pressure sensor; u. of0The initial pressure value corresponding to the pressure signal detected by the pressure sensor is represented when the valve rod is at the position with the rotation angle of 0 degrees; u. of1When the valve rod is at the position of 90 DEG of rotation angleThe pressure sensor detects a pressure signal corresponding to the end point pressure value; n represents the total number of angular adjustments of the valve stem during the liquid flow; thetaiRepresenting the i-th angular adjustment of the valve stem in n adjustments;
step A2: calculating a flow detection value Q passing through the ball valve according to formula (2);
Figure FDA0002347874160000032
wherein P represents a differential pressure value of a pressure signal acquired by the pressure sensor; ρ represents the density of the liquid flowing through the ball valve; g represents the gravitational acceleration; r represents the local resistance of the ball valve;
step A3: correcting the flow detection value obtained by calculation in the step A2 according to a formula (3) to obtain a corrected flow detection value Q';
Figure FDA0002347874160000033
wherein, Δ uiA correction factor representing a pressure value corresponding to the ith angle adjustment of the n adjustments; lambda [ alpha ]minRepresents the minimum drive correction factor of the drive device in n adjustments; lambda [ alpha ]maxRepresents the maximum drive correction factor of the drive unit in n adjustments; xiThe pressure value of the liquid flowing through the ball valve after i times of adjustment is represented; xnThe pressure value of the liquid flowing through the ball valve after n times of adjustment is represented; x1Indicating the pressure value of the liquid flowing through the ball valve after the initial adjustment;
Figure FDA0002347874160000034
a ball valve correction factor indicative of liquid flow through the ball valve; min { } represents a minimum function;
if the corrected flow detection value Q' is smaller than the first threshold value of the flow demand value S, controlling the valve rod to rotate according to a preset increased rotation angle on the basis of the current rotation angle;
if the corrected flow detection value Q' is larger than a second threshold value of the flow demand value S, controlling the valve rod to rotate according to a preset rotation reducing angle on the basis of the current rotation angle;
when the corrected flow rate detection value Q' is within the range from the first threshold value to the second threshold value of the flow rate demand value S, the valve stem is controlled to maintain the current rotation angle.
CN201911402736.0A 2019-12-30 2019-12-30 Large-diameter all-welded ball valve Active CN110925454B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113579659A (en) * 2021-08-09 2021-11-02 富山阀门实业(东台)有限公司 Brass valve machining method

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GB1364413A (en) * 1972-06-08 1974-08-21 Shafter H J Trunnion type rotary valve of welded tube and plate construction
CN2893343Y (en) * 2006-01-10 2007-04-25 金克雨 Whole-welding forged steel ball valve
CN202927121U (en) * 2012-11-10 2013-05-08 无锡智能自控工程股份有限公司 Ball valve for tank bottom vacuum sampling
CN203604702U (en) * 2013-12-05 2014-05-21 中亚阀门有限公司 Full-welding top-assembling-type floating ball valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB919297A (en) * 1960-05-26 1963-02-20 Cameron Iron Works Inc Rotary fluid control valves
GB1364413A (en) * 1972-06-08 1974-08-21 Shafter H J Trunnion type rotary valve of welded tube and plate construction
CN2893343Y (en) * 2006-01-10 2007-04-25 金克雨 Whole-welding forged steel ball valve
CN202927121U (en) * 2012-11-10 2013-05-08 无锡智能自控工程股份有限公司 Ball valve for tank bottom vacuum sampling
CN203604702U (en) * 2013-12-05 2014-05-21 中亚阀门有限公司 Full-welding top-assembling-type floating ball valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113579659A (en) * 2021-08-09 2021-11-02 富山阀门实业(东台)有限公司 Brass valve machining method
CN113579659B (en) * 2021-08-09 2022-07-19 富山阀门实业(东台)有限公司 Brass valve machining method

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