CN110195783B - Piston type valve core pressure self-balancing stop throttle valve - Google Patents
Piston type valve core pressure self-balancing stop throttle valve Download PDFInfo
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- CN110195783B CN110195783B CN201910479183.2A CN201910479183A CN110195783B CN 110195783 B CN110195783 B CN 110195783B CN 201910479183 A CN201910479183 A CN 201910479183A CN 110195783 B CN110195783 B CN 110195783B
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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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
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
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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
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/04—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member
Abstract
The invention belongs to the technical field of stop valve structures, and discloses a piston type valve core pressure self-balancing stop throttle valve, wherein the top of a valve core is connected with a valve rod and is provided with a balancing hole, the bottom of the valve core is provided with a pressure inlet hole corresponding to the position of a valve hole, a sectional type hollow cavity is arranged inside the valve core, and the balancing hole and the pressure inlet hole are communicated with the hollow cavity; the hollow cavity comprises a pressure relief cavity, an auxiliary valve sleeve cavity and a channel cavity from top to bottom, the opening diameter of the channel cavity is smaller than that of the auxiliary valve sleeve cavity and that of the pressure relief cavity, the opening diameter of the auxiliary valve sleeve cavity is smaller than that of the pressure relief cavity, an auxiliary valve core capable of moving up and down in the auxiliary valve sleeve cavity to open and close the channel cavity is arranged in the auxiliary valve sleeve cavity through a piston rod, and the stop throttle valve is suitable for operating conditions of millions of opening and closing, and utilizes a piston structure in the valve core to realize automatic pressure balance so as to adapt to high-frequency and long-service-life switches.
Description
Technical Field
The invention belongs to the technical field of stop valve structures, and particularly relates to a piston type valve core pressure self-balancing stop throttle valve.
Background
Huge pressure energy is contained in the natural gas conveying pipeline network. In a west-east gas transmission pipeline with the length of 3856 kilometers, the annual gas transmission amount reaches 1200 hundred million cubic meters, the pressure is up to 10MPa, and the pressure to a user end only needs 0.4MPa; the application of the throttle valve as an important component in a gas transmission pipeline is very common, because of the huge pressure of pipeline transmission, the valve core of the throttle valve as an on-off switch needs to realize the frequent opening and closing actions for realizing the opening and closing control of a channel, and the valve core of the throttle valve needs to resist the extremely large pressure difference in a cavity in the opening and closing process.
As in the prior art, the present applicant's prior application, publication No. CN207246426U, publication No. 2018, 4 and 17, and utility model patent document entitled "manual-automatic dual-purpose high pressure balance stop throttle valve" discloses a full-balance emptying valve, and relates to the technical field of valves. The utility model discloses design into the area the same with the horizontal cross section in disk seat hole with the horizontal cross section area of the cavity that forms between case, case cover and the valve gap for the case receives cavity internal pressure and disk seat hole inlet pressure the same, and when opening and close the valve, the valve rod just need not overcome the pressure differential that the case received, only needs to overcome the frictional force between filler and valve rod, valve rod and the valve-stem nut, opens and close moment and will significantly reduce. The valve in this technical solution is a low-in high-out valve, and its balance structure principle, the balance hole is always open, as mentioned above, the valve is under the open and close working condition and will receive the area pressure from the bottom, when closing, it needs extra propelling force to counteract the pressure, and when closing, it also needs to continuously apply this counteracting force.
In a natural gas transmission pipeline, each pressure-resistant container is required to be provided with a regulating valve for controlling gas and water to enter and exit, the regulating valve is required to be opened and closed twice per minute, if the service life of the regulating valve is one year, the service life of a sealing element of the regulating valve is millions of times, and the regulating valve is required to be designed to be convenient to open and close and have longer service life.
Disclosure of Invention
The invention aims to provide a stop throttle valve which is suitable for operating conditions of millions of opening and closing and utilizes a piston type structure in a valve core to realize automatic pressure balance so as to adapt to high-frequency and long-service-life switches, aiming at the defects of the prior art.
The invention discloses a piston type valve core pressure self-balancing stop throttle valve, which comprises a valve body provided with an inlet and an outlet as all throttle valves, wherein a valve core and a valve core sleeve are arranged at a valve hole in the valve body, and the valve core is driven by a valve rod to move up and down in the valve core sleeve to open and close the valve hole, and is characterized in that:
the top of the valve core is connected with the valve rod and is provided with a balance hole, the bottom of the valve core is provided with a pressure inlet hole corresponding to the position of the valve hole, a sectional type hollow cavity is arranged inside the valve core, and the balance hole and the pressure inlet hole are communicated with the hollow cavity; the hollow cavity comprises a pressure relief cavity, an auxiliary valve sleeve cavity and a channel cavity from top to bottom, the opening diameter of the channel cavity is smaller than that of the auxiliary valve sleeve cavity and smaller than that of the pressure relief cavity, an auxiliary valve core capable of moving up and down in the auxiliary valve sleeve cavity to open and close the channel cavity is arranged in the auxiliary valve sleeve cavity through a piston rod, namely an auxiliary valve core structure is arranged in the valve core, the auxiliary valve sleeve cavity serving as a movement track of the auxiliary valve core is a section of the valve core hollow cavity, so that the opening and closing of the channel cavity can be realized along with the up-and-down movement of the auxiliary valve core in the auxiliary valve sleeve cavity, and as the pressure relief cavity, the auxiliary valve sleeve cavity and the channel cavity are arranged from top to bottom in the hollow cavity, and a balance hole and a pressure inlet hole are respectively formed in the top and the bottom of the valve core, pressure gas enters the channel cavity from the pressure inlet hole after the valve core moves down along with a valve rod to close a valve hole, when the pressure is greater than the weight of the auxiliary valve core, the auxiliary valve core moves upwards to open the channel cavity after being subjected to the pressure, the pressure is poured into the pressure relief cavity and enters the cavity formed between the top of the valve core and the upper part of the valve sleeve as well as the bottom of the valve cover from the balance hole, and the pressure from the bottom is applied to the upper part of the valve core enough to balance the pressure in the space of the valve body, so that the defect that the valve core needs larger force to maintain the closing after being closed due to the large pressure at the valve hole in the prior art is overcome, the power consumption is saved, meanwhile, because the pressure is balanced, the stress of a valve core device is more uniform, the external force is less applied, the high-frequency opening and closing action is convenient to realize, the lower loss is realized, and the characteristics of long service life and good effect are presented.
The top end of the piston rod is connected with the top of the hollow cavity, the auxiliary valve element is sleeved at the bottom end of the piston rod in a vertically movable mode, namely the piston rod is used as the motion track guide of the auxiliary valve element, the auxiliary valve element moves to be opened and closed completely according to the gas pressure at the upper end and the lower end until the pressure is balanced, and the automatic adjusting device has the effect of automatic adjustment in real time.
Furthermore, a plug head with a size corresponding to the size of the opening of the channel cavity is arranged at the position, corresponding to the channel cavity, of the bottom of the auxiliary valve core, and the plug head is wholly or partially plugged into the channel cavity, so that better sealing is achieved.
The plug is in an inverted conical column shape, the cross sectional area of the position where the plug contacts the bottom of the auxiliary valve core is larger than that of the opening of the channel cavity, the cross sectional area of the bottom end of the plug is smaller than that of the opening of the channel cavity, the plug structure with the wide top and the narrow bottom is the most classical structure, the self-adjusting function of the auxiliary valve core is realized based on pressure difference in the cavity, pressure acts on a contact surface, pressure gas is applied to the plug of the auxiliary valve core from the bottom, pressure in a valve sleeve cavity where the valve core is located acts on the top of the valve core, when pressure difference exists up and down, the quick opening and closing action of the auxiliary valve core can be realized due to the concentrated stress with small area, and self-balancing of the pressure in the cavity can be realized in the optimal time.
Preferably, the contact position between the plug head and the channel cavity is a hard alloy sealing pair, and the sealing pair made of hard alloy materials is arranged on the contact surface of the reciprocating motion, so that the sealing and the durability can be both achieved.
Furthermore, the auxiliary valve core is also provided with a plurality of through holes which are communicated up and down along the up-and-down moving direction of the auxiliary valve core, namely when the auxiliary valve core moves upwards to open the channel cavity, pressure gas can enter the pressure relief cavity from the through holes of the auxiliary valve core after being mixed in, and then enters the upper cavity, so that the pressure balance is rapidly realized, and the pressure of the upper cavity is favorably discharged when the valve core rises to open the valve port.
The valve body is detachably provided with a valve cover with a valve rod channel, the valve cover is also detachably buckled with a valve cover for installing a power unit, the detachable structure is convenient to adjust and maintain, a cavity for the shaft coupler to move up and down is formed between the valve cover and the valve cover, the shaft coupler is guaranteed to have sufficient space on the motion trail and can be protected, the top of the valve rod penetrates through the valve cover through the valve rod channel to be connected with the power unit in the cavity through the shaft coupler in a transmission mode, the shaft coupler is connected to guarantee tightness, and meanwhile adjustment during installation and replacement of the valve rod or the power unit according to the use specification and requirements are facilitated; leave the space between shaft coupling and the cavity inner wall, the valve rod is the up-and-down motion in principle, and its shaft coupling as connecting device that corresponds also is the motion in-process vertical direction, but because mechanical structure's error, actual service environment's influence factor etc. have about being difficult to avoid rocking of direction, especially detachable assembled structure, just parallel or coincidence between the neutral line of power pack and the neutral line of valve rod probably has the deviation with the neutral line of valve rod when satisfying the adjustment requirement.
The shaft coupling includes flange and lower flange, pass through between the top of power pack and valve rod upper flange links to each other with the transmission of lower flange, be connected through supporting screw rod and nut between upper flange and the lower flange, the dismouting of being convenient for and stable, just the body of rod of screw with leave the space between the screw inner wall of upper flange and/or lower flange, this also be convenient for can independently adjust when meetting the deviation in reciprocating motion and leave the allowance.
The valve cover is connected with the valve cover through a matched screw rod and a nut, a gap is reserved between the rod body of the screw rod and the inner wall of the screw hole in the upper valve cover and/or the inner wall of the screw hole in the valve cover, and a transverse adjusting allowance is reserved to be beneficial to avoiding mechanical collision and blocking.
Preferably, the junction of valve bonnet and valve gap is provided with the sealing washer structure, avoids leaking gas decompression to influence the valve body performance.
The valve cover is provided with a discharge valve communicated with the cavity, and due to the valve body cover structure and moving parts such as a valve rod, a valve core and the like, partial pressure gas can be leaked into the cavity inevitably, and manual or automatic pressure relief can be performed through the discharge valve in order to avoid overlarge pressure accumulation.
The power unit is an air pressure type telescopic rod, a hydraulic telescopic rod or an electric telescopic device and aims to provide power for the movement of the valve rod.
Further, be provided with the stuffing box structure that corresponds above-mentioned valve rod body of rod on the valve rod passageway inner wall, it is corresponding, valve rod passageway top detachable is provided with the valve rod guide cover that the internal diameter corresponds with the valve rod passageway, can take out or put into at the valve rod passageway through dismantling the valve rod guide cover the stuffing box structure.
The stuffing box structure comprises a sealing grease structure from the upper part and a V-shaped stuffing structure from the lower part; the sealing grease structure comprises at least one upper sealing ring and at least one lower sealing ring, the inner diameter of each sealing ring is smaller than that of the stuffing box structure, a plurality of groups of oil grooves are arranged among the sealing rings, lubricating oil is contained in the oil grooves, and the valve rod is easy to generate electrochemical corrosion under friction generated by frequent movement of the valve rod to cause premature failure of the valve rod, so that the lubricating oil of the sealing grease structure can generate a long-term oil film on the outer surface of the valve rod, the valve rod is prevented from premature failure, and the long-term service life of the stop throttle valve is ensured; the V-shaped packing structure comprises a plurality of layers of V-shaped packing which are stacked.
The V-shaped packing structure comprises an upper packing pad, a middle packing pad and a lower packing pad, the middle packing pad is formed by stacking a plurality of layers of V-shaped packing, and the service life of the V-shaped packing is long; spring washers are installed in the upper packing pad and the lower packing pad, rubber washers are installed at the upper end of the outer ring of the upper packing pad and the lower end of the outer ring of the lower packing pad, the lower end of the upper packing pad and the upper end of the lower packing pad are of V-shaped structures corresponding to the V-shaped packing, and a clearance groove is formed in the vertex angle of each V-shaped structure.
The included angle of the V-shaped structure is larger than that of the V-shaped filler.
And middle spring washers are arranged among the V-shaped fillers which are stacked and used as middle filler pads.
The thicknesses of the upper packing pad and the lower packing pad are both larger than that of the V-shaped packing.
Compared with the scheme in the prior art, the medium (pressure gas) of the throttle valve is high in inlet and low in outlet, enters the fit clearance between the valve core sleeve and the valve core through the window on the valve core sleeve and reaches the space at the upper part of the valve core, the valve core is tightly attached to the valve port by the valve rod under the downward force of the power unit, the balance hole on the valve core is closed, and the valve core is ensured to be tightly closed under the combined action of the medium pressure entering the cavity of the valve core, the valve sleeve and the valve cover space and the downward force of the power unit.
When the regulating valve is opened, the valve rod moves upwards for a small distance under the action of the power unit, the needle conical surface at the lower part of the valve rod leaves the auxiliary valve core, the auxiliary valve core is opened, medium flows to the lower end face of the valve core from the balance hole, the medium pressure on the upper space of the valve core is rapidly reduced because the area of the fit clearance between the valve core sleeve and the valve core is smaller than the area of the balance hole on the valve core, the valve rod drives the valve core to easily leave the valve port at the moment, the inlet and the outlet of the regulating valve are communicated, the valve core generates an upward force due to the fact that the area of the upper space of the valve core is smaller than the area of the lower part of the valve core by the diameter area of the valve rod, and the regulating valve can be rapidly opened under the combined action of the power unit.
When the regulating valve needs to be closed, the valve rod moves downwards for a short distance under the action of the power unit, and the auxiliary valve core is closed; the medium is prevented from flowing to the lower end face of the valve core from the balance hole, the medium pressure on the upper space of the valve core is rapidly increased, and before the auxiliary valve core is closed, the valve core is only subjected to a small upward force of the cross section area of the valve rod, so that the power unit is only required to overcome the force, and the valve core can be ensured to be rapidly closed.
The regulating valve needs millions of opening and closing service lives, so that the V-shaped packing with long service life is adopted in the stuffing box of the regulating valve, the V-shaped packing is a non-metal packing, electrochemical corrosion is easily generated under friction generated by frequent movement of the valve rod, and the valve rod is easily failed in advance; therefore, the special sealing grease mechanism is arranged at the upper part of the stuffing box, the O-shaped sealing rings are arranged above and below the sealing grease mechanism, sealing grease is guaranteed not to flow out of the sealing grease mechanism when the valve rod moves up and down, so that an oil film existing for a long time is generated on the outer surface of the valve rod, the possibility of failure of the valve rod in advance is avoided, and the long-term service life of the regulating valve is guaranteed.
Drawings
The foregoing and following detailed description of the invention will be apparent when read in conjunction with the following drawings, in which:
FIG. 1 is a schematic view of the internal structure of the throttle valve of the present invention;
FIG. 2 is a schematic view of the throttle valve spool of the present invention;
FIG. 3 is a schematic view of the secondary spool of the present invention;
FIG. 4 is a schematic structural view of a throttle valve cover portion of the present invention;
FIG. 5 is a schematic illustration of the throttle stuffing box configuration of the present invention;
in the figure:
1. a valve body; 2. a valve core; 3. a valve core sleeve; 4. a valve stem; 5. a valve bore; 6. a balance hole; 7. a pressure inlet hole; 8. a channel cavity; 9. an auxiliary valve sleeve cavity; 10. a pressure relief cavity; 11. a secondary valve core; 12. a valve cover; 13. a valve housing; 14. a power unit; 15. a coupling; 15.1, an upper flange; 15.2, lower flange; 16. a bleed valve; 17. a piston rod; 18. a plug head; 19. a sealing pair; 20. a screw and a nut; 21. a V-shaped packing structure; 22. a seal ring; 23. an oil groove.
Detailed Description
The technical solutions for achieving the objects of the present invention are further illustrated by the following specific examples, and it should be noted that the technical solutions claimed in the present invention include, but are not limited to, the following examples.
Example 1
As a most basic embodiment of the present invention, the piston type spool pressure self-balancing stop throttle valve disclosed in this embodiment includes, as shown in fig. 1, a valve body 1 provided with an inlet and an outlet, a spool 2 and a spool sleeve 3 are provided at a valve hole 5 in the valve body 1, and the spool 2 moves up and down in the spool sleeve 3 under the driving of a valve rod 4 to open and close the valve hole 5; as shown in fig. 2, the top of the valve core 2 is connected with the valve rod 4 and is provided with a balance hole 6, the bottom of the valve core 2 is provided with a pressure inlet hole 7 corresponding to the position of the valve hole 5, a sectional hollow cavity is arranged inside the valve core 2, and the balance hole 6 and the pressure inlet hole 7 are communicated with the hollow cavity; the hollow cavity comprises a pressure relief cavity 10, an auxiliary valve sleeve cavity 9 and a channel cavity 8 from top to bottom, the opening diameter of the channel cavity 8 is smaller than that of the auxiliary valve sleeve cavity 9 and the pressure relief cavity 10, the opening diameter of the auxiliary valve sleeve cavity 9 is smaller than or equal to that of the pressure relief cavity 10, an auxiliary valve core 11 which can move up and down in the auxiliary valve sleeve cavity 9 to open and close the channel cavity 8 is arranged in the auxiliary valve sleeve cavity 9 through a piston rod 17, namely, an auxiliary valve core 2 structure is arranged in the valve core 2, the auxiliary valve sleeve cavity 9 serving as a moving track of the auxiliary valve core 2 is a section of the valve core hollow cavity, therefore, along with the up and down movement of the auxiliary valve core 2 in the auxiliary valve sleeve cavity 9, the opening and closing of the channel cavity 8 can be realized, and because the pressure relief cavity 10, the auxiliary valve sleeve cavity 9 and the channel cavity 8 are arranged from top to bottom in the hollow cavity, and the balance hole 6 and the pressure inlet hole 7 are respectively arranged at the top and the bottom of the valve core 2, after the valve core 2 moves down along with a valve rod 4 to close the valve hole 5, pressure is in the valve core 8, pressure is more uniform, and the pressure loss is realized, and the pressure loss is more reduced when the pressure is applied to the valve core 2 and the pressure loss is more uniform pressure loss is realized, the pressure loss is maintained in the valve core 2, and the pressure loss is more uniform pressure loss is realized, and the pressure loss is realized, the pressure loss is also when the pressure loss is realized, the pressure loss is more uniform pressure loss is realized, the pressure loss is more easily, and the pressure loss is more easily, the pressure loss is also when the pressure loss is applied to the pressure loss is realized in the pressure loss is reduced when the pressure loss is applied to the valve core 2, the pressure loss is more easily, the characteristics of long service life and good effect are presented.
Example 2
As a preferred embodiment of the present invention, on the basis of the above example 1, further, as shown in fig. 3, the top end of the piston rod 17 is connected to the top of the hollow cavity, the auxiliary valve element 11 is movably sleeved on the bottom end of the piston rod 17 up and down, that is, the piston rod 17 is used as the motion track guide of the auxiliary valve element 2, and the auxiliary valve element 2 moves completely according to the gas pressures at the upper and lower ends to realize opening and closing until the pressures reach a balance, so as to have the effect of automatic real-time adjustment. Further, as shown in fig. 3, a plug 18 with a size corresponding to the size of the opening of the passage chamber 8 is disposed at a position corresponding to the passage chamber 8 at the bottom of the secondary valve element 11, and the plug 18 is wholly or partially plugged into the passage chamber 8, which is favorable for better sealing; the plug head 18 is an inverted conical cylinder, the cross-sectional area of the position where the plug head 18 contacts the bottom of the auxiliary valve core 11 is larger than the cross-sectional area of the opening of the channel cavity 8, the cross-sectional area of the bottom end of the plug head 18 is smaller than the cross-sectional area of the opening of the channel cavity 8, the plug type structure with the wide top and the narrow bottom is the most classical structure, the self-regulation function of the auxiliary valve core 2 is realized based on the pressure difference in the cavity, the pressure acts on a contact surface, pressure gas is applied to the plug head 18 of the auxiliary valve core 2 from the bottom, the pressure in the valve sleeve cavity where the valve core 2 is located acts on the top of the valve core 2, when the pressure difference exists up and down, the quick reaction is convenient, the concentrated stress with a small area can be beneficial to realizing the quick opening and closing action of the auxiliary valve core 2, and the self-balancing of the pressure in the cavity is realized in the optimal time; preferably, the contact position between the plug 18 and the channel cavity 8 is a sealing pair 19 made of hard alloy, and the sealing pair 19 made of hard alloy material is arranged at the contact surface of the reciprocating motion, so that the sealing and the durability can be both considered.
Furthermore, as shown in fig. 3, the auxiliary valve element 11 is further provided with a plurality of through holes which are vertically through, that is, when the auxiliary valve element 2 moves upwards to open the channel cavity 8, the pressure gas can enter the pressure relief cavity 10 from the through holes of the auxiliary valve element 2 and then enter the upper cavity after entering the pressure relief cavity, so that the pressure balance can be rapidly realized, and the pressure of the upper cavity can be easily released when the valve element 2 rises to open the valve port.
In order to better provide a mechanical motion environment to adapt to high-frequency opening and closing actions, as shown in fig. 4, a valve cover 12 with a valve rod 4 channel is further detachably arranged on the valve body 1, a valve cover 13 for installing a power unit 14 is also detachably buckled on the valve cover 12, the detachable structure is convenient to adjust and maintain, a cavity for the coupling 15 to move up and down is formed between the valve cover 13 and the valve cover 12, the shaft coupling is guaranteed to have a sufficient space on a motion track and can be protected, the top of the valve rod 4 penetrates through the valve cover 12 through the valve rod 4 channel and is in transmission connection with the power unit 14 through the coupling 15 in the cavity, the tightness is guaranteed through the connection of the shaft coupling, and adjustment during installation and replacement of the valve rod 4 or the power unit 14 according to use specifications and requirements are facilitated; leave the space between shaft coupling 15 and the cavity inner wall, valve rod 4 is the up-and-down motion in principle, and its shaft coupling 15 as connecting device that corresponds also is vertical direction upward movement in the motion process, but because mechanical structure's error, actual service environment's influence factor etc. have rocking of left right direction, especially detachable assembled structure inevitably, just parallel or coincidence between power unit 14's neutral line and valve rod 4's neutral line, perhaps there is the deviation in power unit 14 neutral line and valve rod 4's neutral line when satisfying the adjustment requirement.
The coupling 15 comprises an upper flange 15.1 and a lower flange 15.2, the power unit 14 is in transmission connection with the top of the valve rod 4 through the upper flange 15.1 and the lower flange 15.2, the upper flange 15.1 and the lower flange 15.2 are connected with a nut 20 through a matched screw rod, so that the coupling is convenient to disassemble, assemble and stabilize, a gap is reserved between a rod body of the screw rod and the inner wall of a screw hole of the upper flange 15.1 and/or the lower flange 15.2, and a margin can be reserved for self-adjustment when deviation occurs in reciprocating motion; the valve cover 13 and the valve cover 12 are connected with a nut 20 through a matched screw rod, a gap is reserved between the rod body of the screw rod and the inner wall of a screw hole on the upper valve cover 13 and/or the valve cover 12, and a transverse adjusting allowance is reserved to avoid mechanical collision and clamping; and preferably, a sealing ring structure is arranged at the joint of the valve cover 13 and the valve cover 12, so that the performance of the valve body 1 is prevented from being influenced by air leakage and pressure loss.
For safety reasons, as shown in fig. 4, a relief valve 16 communicating with the cavity is provided on the valve housing 13, and due to the cover structure of the valve body 1 and the moving parts such as the valve rod 4 and the valve core 2, it is inevitable that part of the pressure gas leaks into the cavity, and in order to avoid excessive pressure accumulation, manual or automatic pressure relief can be performed through the relief valve 16.
As for the choice of the power unit 14, the power unit 14 may be a pneumatic telescopic rod, a hydraulic telescopic rod or an electric telescopic device, and the purpose of the power unit 14 is to provide power for the movement of the valve rod 4.
Further, be provided with the stuffing box structure that corresponds the above-mentioned 4 body of rod of valve rod on the 4 passageway inner walls of valve rod, it is corresponding, 4 passageway tops of valve rod detachable are provided with the valve rod 4 guide cover that the internal diameter corresponds with the 4 passageways of valve rod, can take out or put into at the 4 passageways of valve rod through dismantling the valve rod 4 guide cover the stuffing box structure.
As shown in fig. 5, the stuffing box structure includes a sealing grease structure from the upper part and a V-shaped stuffing structure 21 from the lower part; the sealing grease structure comprises at least one upper sealing ring 22 and at least one lower sealing ring 22, the inner diameter of each sealing ring 22 is smaller than that of the stuffing box structure, a plurality of groups of oil grooves 23 are arranged between the sealing rings 22, lubricating oil is contained in the middle of each oil groove 23, electrochemical corrosion is easy to generate under friction generated by frequent movement of the valve rod 4 to cause the valve rod 4 to fail in advance, and therefore the lubricating oil of the sealing grease structure enables the outer surface of the valve rod 4 to generate a long-term oil film, so that the valve rod 4 is prevented from failing in advance, and the long-term service life of the regulating valve is ensured; the V-shaped packing structure 21 includes several layers of stacked V-shaped packing.
The V-shaped packing structure 21 comprises an upper packing pad, a middle packing pad and a lower packing pad, the middle packing pad is formed by stacking a plurality of layers of V-shaped packing, and the service life of the V-shaped packing is long; spring washers are arranged in the upper packing pad and the lower packing pad, rubber washers are arranged at the upper end of the outer ring of the upper packing pad and the lower end of the outer ring of the lower packing pad, the lower end of the upper packing pad and the upper end of the lower packing pad are both V-shaped structures corresponding to the V-shaped packing, and a clearance groove is arranged at the vertex angle of each V-shaped structure; the included angle of the V-shaped structure is larger than that of the V-shaped filler; middle spring washers are arranged among the V-shaped fillers which are stacked and arranged as the middle filler pads; the thicknesses of the upper packing pad and the lower packing pad are larger than that of the V-shaped packing.
Compared with the scheme in the prior art, the medium (pressure gas) of the throttle valve in the scheme is high in inlet and low in outlet, enters the matching gap between the valve core sleeve 3 and the valve core 2 through the window on the valve core sleeve 3 and reaches the upper space of the valve core 2, at the moment, the valve rod 4 tightly attaches the valve core 2 to the valve port under the downward force action of the power unit 14, the balance hole 6 on the valve core 2 is closed, and the medium pressure entering the space cavity of the valve core 2, the valve sleeve and the valve cover 12 and the downward force of the power unit 14 jointly ensure that the valve core 2 is tightly closed.
When the regulating valve is opened, the valve rod 4 moves upwards for a short distance under the action of the power unit 14, the needle-shaped conical surface at the lower part of the valve rod 4 leaves the auxiliary valve core 2, the auxiliary valve core 2 is opened, a medium flows to the lower end surface of the valve core 2 from the balance hole 6, the medium pressure on the upper space of the valve core 2 is rapidly reduced because the area of the fit clearance between the valve core sleeve 3 and the valve core 2 is smaller than the area of the balance hole 6 on the valve core 2, at the moment, the valve rod 4 drives the valve core 2 to easily leave a valve port, the inlet and the outlet of the regulating valve are communicated, the area of the upper space of the valve core 2 is smaller than the area of the lower part of the valve core 2 by one diameter area of the valve rod 4, the valve core 2 generates an upward force, and the regulating valve can be rapidly opened under the combined action of the power unit 14.
When the regulating valve needs to be closed, the valve rod 4 moves downwards for a short distance under the action of the power unit 14, and the secondary valve core 2 is closed; the medium is prevented from flowing to the lower end face of the valve core 2 from the balance hole 6, the medium pressure on the upper space of the valve core 2 is rapidly increased, and before the secondary valve core 2 is closed, the valve core 2 is only subjected to a small upward force of the cross section area of the valve rod 4, so that the power unit 14 is only required to overcome the force, and the valve core 2 can be ensured to be rapidly closed.
The regulating valve needs millions of opening and closing service lives, so the regulating valve stuffing box adopts the V-shaped stuffing with long service life, the V-shaped stuffing is a non-metal stuffing, electrochemical corrosion is easy to generate under the friction generated by frequent movement of the valve rod 4, and the valve rod 4 is easy to fail in advance; therefore, the special sealing grease mechanism is arranged at the upper part of the stuffing box, the O-shaped sealing rings are arranged above and below the sealing grease mechanism, and the sealing grease can not flow out of the sealing grease mechanism when the valve rod 4 moves up and down, so that an oil film existing for a long time can be generated on the outer surface of the valve rod 4, the possibility of failure of the valve rod 4 in advance is avoided, and the long-term service life of the regulating valve is ensured.
Claims (10)
1. Piston case pressure self-balancing stop throttle valve, including valve body (1) that is provided with import and export, valve hole (5) department is provided with case (2) and case cover (3) in valve body (1), and case (2) reciprocate in case cover (3) in the drive of valve rod (4) and realize the switching to valve hole (5), its characterized in that:
the top of the valve core (2) is connected with the valve rod (4) and is provided with a balance hole (6), the bottom of the valve core (2) is provided with a pressure inlet hole (7) corresponding to the position of the valve hole (5), a sectional type hollow cavity is arranged inside the valve core (2), and the balance hole (6) and the pressure inlet hole (7) are communicated with the hollow cavity; the hollow cavity comprises a pressure relief cavity (10), an auxiliary valve sleeve cavity (9) and a channel cavity (8) from top to bottom, the opening diameter of the channel cavity (8) is smaller than that of the auxiliary valve sleeve cavity (9) and the pressure relief cavity (10), the opening diameter of the auxiliary valve sleeve cavity (9) is smaller than or equal to that of the pressure relief cavity (10), and an auxiliary valve core (11) capable of moving up and down in the auxiliary valve sleeve cavity (9) to open and close the channel cavity (8) is arranged in the auxiliary valve sleeve cavity (9) through a piston rod (17); the medium enters from the high position to the low position and enters into the matching clearance between the valve core sleeve (3) and the valve core (2) through a window on the valve core sleeve (3) to reach the upper space of the valve core (2); the area of a fit clearance between the valve core sleeve (3) and the valve core (2) is smaller than the area of a balance hole (6) on the valve core (2);
when the regulating valve is opened, the valve rod (4) moves upwards for a short distance under the action of a power unit (14), the needle-shaped conical surface at the lower part of the valve rod (4) leaves the auxiliary valve core (11), the auxiliary valve core (11) is opened, and a medium flows to the lower end surface of the valve core (2) from the balance hole (6); when the regulating valve needs to be closed, the valve rod (4) moves downwards for a short distance under the action of the power unit (14), and the secondary valve core (11) is closed; the medium is prevented from flowing from the balancing hole (6) to the lower end surface of the valve core (2).
2. The piston type valve core pressure self-balancing stop throttle valve of claim 1, characterized in that: the top end of the piston rod (17) is connected with the top of the hollow cavity, and the auxiliary valve core (11) is sleeved at the bottom end of the piston rod (17) in a vertically movable mode.
3. The piston type valve core pressure self-balancing stop throttle valve of claim 1, characterized in that: and a plug head (18) with the size corresponding to the opening size of the channel cavity (8) is arranged at the position, corresponding to the channel cavity (8), of the bottom of the auxiliary valve core (11).
4. The piston type valve core pressure self-balancing stop throttle valve of claim 3, characterized in that: the plug head (18) is in an inverted conical column shape, the cross sectional area of the position where the plug head (18) is contacted with the bottom of the auxiliary valve core (11) is larger than the cross sectional area of the opening of the channel cavity (8), and the cross sectional area of the bottom end of the plug head (18) is smaller than the cross sectional area of the opening of the channel cavity (8).
5. The piston type spool pressure self-balancing cutoff throttle valve of claim 3 or 4, characterized in that: the contact position between the plug head (18) and the channel cavity (8) is a sealing pair (19) made of hard alloy.
6. The piston type spool pressure self-balancing cutoff throttle valve of claim 1, characterized in that: and a plurality of through holes which are communicated up and down are also formed in the auxiliary valve core (11) along the direction of the up-and-down movement of the auxiliary valve core.
7. The piston type spool pressure self-balancing cutoff throttle valve of claim 1, characterized in that: the valve body (1) is detachably provided with a valve cover (12) with a valve rod channel, the valve cover (12) is also detachably buckled with a valve cover (13) used for installing a power unit (14), and a sealing ring structure is arranged at the joint of the valve cover (13) and the valve cover (12); a cavity for a coupler (15) to move up and down is formed between the valve cover (13) and the valve cover (12), the top of the valve rod (4) penetrates through the valve cover (12) through the valve rod channel and is in transmission connection with a power unit (14) through the coupler (15) in the cavity, and a discharge valve (16) communicated with the cavity is arranged on the valve cover (13); a gap is reserved between the coupler (15) and the inner wall of the cavity, and the neutral line of the power unit (14) is parallel to or coincided with the neutral line of the valve rod (4).
8. The piston type spool pressure self-balancing stop throttle valve of claim 7, characterized in that: the coupling (15) comprises an upper flange (15.1) and a lower flange (15.2), the top of the power unit (14) and the top of the valve rod (4) are in transmission connection through the upper flange (15.1) and the lower flange (15.2), the upper flange (15.1) and the lower flange (15.2) are connected with a nut (20) through a matched screw rod, and a gap is reserved between a rod body of the screw rod and the inner wall of a screw hole of the upper flange (15.1) and/or the lower flange (15.2); the valve cover (13) is connected with the valve cover (12) through a matched screw rod and a nut (20), and a gap is reserved between the rod body of the screw rod and the inner wall of a screw hole in the valve cover (13) and/or the valve cover (12).
9. The piston type spool pressure self-balancing stop throttle valve of claim 7, characterized in that: a stuffing box structure corresponding to the valve rod body is arranged on the inner wall of the valve rod channel, correspondingly, a valve rod guide cover with the inner diameter corresponding to the valve rod channel is detachably arranged at the top of the valve rod channel, and the stuffing box structure can be taken out or put into the valve rod channel by detaching the valve rod guide cover; the stuffing box structure comprises an upper sealing grease structure and a lower V-shaped stuffing structure (21); the sealing grease structure comprises at least one upper sealing ring (22) and at least one lower sealing ring (22), the inner diameter of each sealing ring (22) is smaller than that of the stuffing box structure, a plurality of groups of oil grooves (23) are arranged between the sealing rings (22), and lubricating oil is contained in the middle of each oil groove (23); the V-shaped packing structure (21) comprises a plurality of layers of V-shaped packing which are stacked.
10. The piston type spool pressure self-balancing cutoff throttle valve of claim 9, characterized in that: the V-shaped packing structure (21) comprises an upper packing pad, a middle packing pad and a lower packing pad, wherein the middle packing pad is formed by stacking a plurality of layers of V-shaped packing; spring washers are arranged in the upper packing pad and the lower packing pad, rubber washers are arranged at the upper end of the outer ring of the upper packing pad and the lower end of the outer ring of the lower packing pad, the lower end of the upper packing pad and the upper end of the lower packing pad are both V-shaped structures corresponding to the V-shaped packing, and a clearance groove is arranged at the vertex angle of each V-shaped structure; the included angle of the V-shaped structure is larger than that of the V-shaped filler; middle spring washers are arranged among the V-shaped fillers stacked in the plurality of layers of the middle filler pads; the thicknesses of the upper packing pad and the lower packing pad are both larger than that of the V-shaped packing.
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| CN201910479183.2A CN110195783B (en) | 2019-06-04 | 2019-06-04 | Piston type valve core pressure self-balancing stop throttle valve |
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| CN201910479183.2A CN110195783B (en) | 2019-06-04 | 2019-06-04 | Piston type valve core pressure self-balancing stop throttle valve |
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| CN110195783B true CN110195783B (en) | 2023-01-06 |
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| CN113324079B (en) * | 2021-06-07 | 2022-11-18 | 哈尔滨工程大学 | Low-power consumption regulating valve with cut-off function |
| CN117628214B (en) * | 2024-01-25 | 2024-03-29 | 四川中油乐仪能源装备制造股份有限公司 | Double-acting throttle stop valve |
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| CN110195783A (en) | 2019-09-03 |
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