CN105626119A - Switching mechanism of overflow safety valve - Google Patents
Switching mechanism of overflow safety valve Download PDFInfo
- Publication number
- CN105626119A CN105626119A CN201610051961.4A CN201610051961A CN105626119A CN 105626119 A CN105626119 A CN 105626119A CN 201610051961 A CN201610051961 A CN 201610051961A CN 105626119 A CN105626119 A CN 105626119A
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- containing cavity
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- liquid inlet
- switching mechanism
- relief valve
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- 238000007789 sealing Methods 0.000 claims abstract description 64
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 239000012530 fluid Substances 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 abstract description 6
- 239000008358 core component Substances 0.000 abstract 8
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a switching mechanism of an overflow safety valve. The switching mechanism comprises a liquid inlet connector and a valve core component, wherein a liquid inlet hole is formed in the liquid inlet connector; the valve core component is removable relative to the liquid inlet connector and is used for controlling the switching on and off of the liquid inlet hole; the valve core component comprises a nut and a valve pad which is arranged in the nut; the valve pad is provided with a sealing surface which is matched with the liquid inlet connector; the sealing surface is a spherical surface. According to the switching mechanism of the overflow safety valve, disclosed by the invention, through matching of the removable valve core component and the liquid inlet connector, the valve core component can be used for controlling the switching on and off of an oil way from the liquid inlet hole to a liquid outlet hole, large-flow overflow can be realized after the valve core component is far away from the liquid inlet connector, the flow of the overflow safety valve is greatly increased, the axial displacement of the valve core component can be lessened by fast overflow in a short time, the axial deformation of a reset spring is reduced when the axial displacement of the valve core component is lessened, and the pressure fluctuation can be finally reduced.
Description
Technical field
The invention belongs to coal mine fully-mechanized mining hydraulic support, specifically, the present invention relates to the switching mechanism of a kind of overflow relief valve.
Background technology
Large-scale along with coal mine fully-mechanized mining hydraulic support is implemented and development; working face is also more and more stricter to the requirement of hydraulic support; thus the relief valve of protective cradle hydraulic jack there is further requirement; especially the service life of relief valve and reliability there is further requirement; when causing by power from the pressure at hydraulic support top; can relief valve when bearing high pressure, and short time substantially stabilized in time off-load directly affects service life and the supporting safety of support. It not only can damage sealing member, pipeline and Hydraulic Elements, but also can cause vibrations and noise; Sometimes some pressure controlled Hydraulic Elements is made to produce error.
Currently used relief valve, mainly includes valve casing, liquid inlet joint, spool, valve pocket, back-moving spring, spring base and voltage regulation screw. In valve casing contained spring chamber, it is on the voltage regulation screw threadeded that back-moving spring one end is against with valve casing, and the other end is against on moveable spring base. Valve body inserts the valve casing other end and with valve casing for threadeding, and valve inner is provided with the cavity for holding valve pocket, and spool is positioned at valve pocket, and the end of spool contacts with spring base, realizes the unlatching of relief valve for promoting spring base to move.
The overflow ducts of existing relief valve is to adopt the liquid pass hole around being arranged on spool sidewall, liquid pass hole aperture is little, cause that draining flow is little, flow loss is big, and owing to spool matches with spring base, spring base bears the axial force that back-moving spring applies, cause that spool force-bearing situation is bad, in work process, pressure oscillation is bigger, and then cause that the closing presure of relief valve is general all undesirable, eventually result in the fluid of the Hydraulic Elements such as high-voltage oil cylinder being connected with relief valve and too much run off and cause waste. Sealing effectiveness between spool and valve pocket is undesirable, and the groove processing precision for installing sealing member that spool face is arranged is wayward. It addition, the spring cavity within valve casing is in open state, dust-proof, waterproof and rust-proof effect are poor, reduce the service life of relief valve.
Summary of the invention
It is contemplated that at least solve one of technical problem of existence in prior art. For this, the present invention provides the switching mechanism of a kind of overflow relief valve, it is therefore an objective to reduce pressure oscillation.
To achieve these goals, the technical scheme that the present invention takes is: the switching mechanism of overflow relief valve, including the liquid inlet joint with inlet opening, also include relatively described liquid inlet joint to may move and for controlling the core assembly of described inlet opening opening and closing, core assembly includes nut and the valve pad being arranged in nut, valve pad has the sealing surface for matching with liquid inlet joint, and sealing surface is sphere.
Described liquid inlet joint includes joint body that the valve casing with overflow relief valve is connected and fixes the sealing being connected and matching with described core assembly with joint body, and valve casing has the outage being distributed in around sealing.
Described joint body inserts in described valve casing and with described valve casing as threadeding.
Described core assembly also includes screw plug, described nut has the first containing cavity for holding described sealing, holds the second containing cavity of described valve pad and for holding the 3rd containing cavity of screw plug, first containing cavity, the second containing cavity and the 3rd containing cavity are for setting gradually, and screw plug is used for closing the second containing cavity.
The end face of described nut is provided with for guiding fluid to the oil duct of outage, when described valve pad and described hermetic unit from after, the fluid in described inlet opening flow to described outage place through oil duct.
Described oil duct and described outage are positioned on the same RADIAL of described valve casing.
Described sealing is to embed the ledge structure contacted in the first containing cavity of described nut and with described valve pad, and the diameter of described second containing cavity is more than the diameter of the first containing cavity.
Described sealing has and sets gradually and the first shaft part, the second shaft part and the 3rd shaft part that overall diameter is gradually increased, 3rd shaft part is fixing with described joint body to be connected, first shaft part matches with described valve pad, and the overall diameter of the second shaft part is not more than the diameter of a described containing cavity.
The length of described second shaft part is not less than the degree of depth of described first containing cavity.
The switching mechanism of core assembly of the present invention, match with liquid inlet joint by arranging moveable core assembly, core assembly can be used for the break-make controlling inlet opening to the oil circuit of outage, big flow overflow can be realized after core assembly is away from liquid inlet joint, relief valve flow is greatly improved, the quick overflow of short time can reduce the axial displacement of core assembly, and core assembly axial displacement is reduced and the axial deformation of back-moving spring can be made to reduce, and may finally reduce pressure oscillation.
Accompanying drawing explanation
This specification includes the following drawings, it is shown that content respectively:
Fig. 1 is the sectional view of the overflow relief valve with switching mechanism of the present invention;
Fig. 2 is overflow relief valve sectional view when being in opening;
Fig. 3 is the sectional view of core assembly;
Fig. 4 is the sectional view of liquid inlet joint;
Fig. 5 is I place enlarged drawing in Fig. 4;
Fig. 6 is the sectional view of nut;
Fig. 7 is the sectional view of spring base;
The valve pad that Fig. 8 is the first structure coordinates schematic diagram with sealing;
Fig. 9 is in the first structure valve pad during opening and coordinates schematic diagram with sealing;
Figure 10 is the sectional view of the valve pad of the second structure;
Figure 11 is in the stress schematic diagram of the second structure valve pad during closed mode;
When Figure 12 is in closed mode, the second structure valve pad coordinates schematic diagram with sealing;
When Figure 13 is in opening, the second structure valve pad coordinates schematic diagram with sealing;
Figure is labeled as:
1, voltage regulation screw; 2, back-moving spring;
3, valve casing; 31, outage; 32, spring cavity;
4, spring base; 41, the first boss; 42, guide section; 43, the second boss;
5, nut; 51, chamber, big footpath; 52, the second containing cavity; 53, the 3rd containing cavity; 54, path chamber; 55, oil duct; 6, screw plug; 61, hole, location; 62, hexagon ring;
7, valve pad; 71, sealing surface; 72, anchor ring; 8, liquid inlet joint; 81, joint body; 82, the first shaft part; 83, the second shaft part; 84, the 3rd shaft part; 9, the first sealing ring; 10, the second sealing ring.
Detailed description of the invention
Below against accompanying drawing, by the description to embodiment, the specific embodiment of the present invention is described in further detail, it is therefore an objective to help those skilled in the art that the design of the present invention, technical scheme are had more complete, accurate and deep understanding, and contribute to its enforcement.
As shown in Figures 1 to 7, for adopting a kind of overflow relief valve of switching mechanism of the present invention, this overflow relief valve includes having the valve casing 3 of outage 31, the liquid inlet joint 8 with inlet opening and resetting-mechanism, and inlet opening is connected with outage 31 by unloading cavity within valve casing 3 and three forms the overflow ducts of relief valve. This overflow relief valve also includes core assembly, core assembly matches with liquid inlet joint 8 and merges the switching mechanism constituting the present invention, core assembly is for being movably arranged in valve casing 3 and for controlling overflow ducts break-make, core assembly is between liquid inlet joint 8 and resetting-mechanism, core assembly and for controlling the opening and closing of inlet opening, namely core assembly realizes the control of overflow ducts break-make by the opening and closing of mobile control inlet opening.
The relief valve of prior art is generally connected on coal mine fully-mechanized mining hydraulic support and equipped with on the Hydraulic Elements such as hydraulic cylinder of pressure medium, when hydraulic cylinder internal liquid is in the work set pressure of relief valve, overflow relief valve, under initial tension of spring effect, is closed; When hydraulic cylinder is higher than minimum setting pressure of relief valve by External Force Acting internal pressure, hydraulic medium pressure exceedes initial tension of spring and opens spool overflow, and the moment of unlatching is referred to as the work of relief valve and opens pressure; Making medium flow out release pressure to hydraulic cylinder internal pressure and spring pre-tightening dynamic balance by the overflow of a period of time of relief valve, now relief valve cuts out, and the steady pressure that relief valve keeps after stopping overflow being referred to as closing presure,
Specifically, as depicted in figs. 1 and 2, valve casing 3 is the cylindrical member of both ends open, inner hollow, and valve casing 3 is internal has the spring cavity 32 holding resetting-mechanism. resetting-mechanism is for applying core assembly to make it move towards liquid inlet joint 8 place to realize the axial force that inlet opening is closed, resetting-mechanism includes spring base 4, back-moving spring 2 and voltage regulation screw 1, voltage regulation screw 1 is to screw in spring cavity 32 in one end of valve casing 3 to threaded with valve casing 3, back-moving spring 2 is to be clipped between voltage regulation screw 1 and spring base 4, spring base 4 can moving axially along valve casing 3 by the promotion of back-moving spring 2 and core assembly in valve casing 3, core assembly promotion spring base 4 moves towards voltage regulation screw 1 place and relief valve can be made to open, back-moving spring 2 promotes spring base 4 and core assembly to move relief valve can be made to close.
As depicted in figs. 1 and 2, the liquid inlet joint 8 of switching mechanism of the present invention is for the such as hydraulic cylinder socket connection of the Hydraulic Elements with coal mine fully-mechanized mining hydraulic support, the voltage regulation screw 1 of resetting-mechanism is to threaded with valve casing 3 in one end of valve casing 3, and liquid inlet joint 8 is for threadeding in the other end screw-in valve casing 3 of valve casing 3 and with valve casing 3. As shown in Figure 4, liquid inlet joint 8 includes with valve casing 3 to be threaded joint body 81 and is the sealing being fixedly and coaxially connected and matching with core assembly with joint body 81, the outer surface of joint body 81 is provided with external screw thread, is provided with female thread at the inner surface of valve casing 3 accordingly. Inlet opening is that the end face center from joint body 81 starts and axially through the through hole to the end face of sealing, and sealing is in valve casing 3 inside and for matching with core assembly, to control the break-make of overflow ducts.
As depicted in figs. 1 and 2, the part cavity between joint body 81 and core assembly within valve casing 3 is as unloading cavity, owing to the relative liquid inlet joint 8 of core assembly is moveable, then and the adjustable volume of unloading cavity. Sealing is by realizing the closedown of inlet opening with contacting of core assembly, and now unloading cavity volume is minimum, and inlet opening does not connect with outage 31, and then makes overflow ducts disconnect, and relief valve realizes cutting out. When core assembly is axially towards when moving away from liquid inlet joint 8 direction, the volume of unloading cavity is gradually increased, and inlet opening can pass through unloading cavity and connect with outage 31, and overflow ducts turns on, and relief valve realizes opening. Therefore, overflow relief valve is moved axially by core assembly, realize the control of overflow ducts break-make, and by unloading cavity connection inlet opening and outage 31, unloading cavity volume is big, big flow overflow can be realized when overflow ducts turns on, it is little that fluid in inlet opening flow in outage 31 process drag losses, such that it is able to realize quick relief in the short time, corresponding, the quick overflow of short time can reduce the axial displacement of core assembly, and core assembly is axially moveable only small distance s in valve casing 3 can complete breakdown action. And the axial displacement of core assembly is reduced, when the overflow relief valve of the present invention adopts the back-moving spring with identical coefficient of elasticity with the relief valve of prior art, the stroke of the back-moving spring 2 in overflow relief valve of the present invention is short, the axial deformation of back-moving spring 2 is little, and the pressure oscillation finally making overflow relief valve is little.
As depicted in figs. 1 and 2, outage 31 is arranged on the sidewall of valve casing 3, outage 31 and for extending radially through the through hole of setting. Outage 31 is also evenly distributed multiple on the sidewall of valve casing 3, and all outages 31 is distributed in around the sealing of unloading cavity and liquid inlet joint 8, so when relief valve is opened, the fluid in inlet opening from passing through between sealing and core assembly and can flow to outage 31. This unloading way liquid stream area is big, and flow is bigger more direct, and drag losses is little.
As shown in Figure 1 to Figure 3, core assembly include nut 5, be arranged at nut 5 in and the valve pad 7 realizing sealing and be arranged in nut 5 and the screw plug 6 for valve pad 7 being carried out axial limiting that matches with nut 5 of matching with sealing. Nut 5 is the cylindrical structural of both ends open and inner hollow, the cavity at nut 5 inside center place is for holding the first containing cavity of sealing, holding the second containing cavity 52 of valve pad 7 and for holding the 3rd containing cavity 53 of screw plug 6, first containing cavity, the second containing cavity 52 and the 3rd containing cavity 53 are for axially to set gradually along nut 5, and diameter is for being gradually increased. One end of valve pad 7 is towards sealing, and the plane that this end end face is the axis perpendicular with liquid inlet joint 8 of valve pad 7, and valve pad 7 is by carrying out, with sealing, the control that plane contact realizes inlet opening is closed, adopting flat seal form, good sealing effect.
As depicted in figs. 1 and 2, the periphery of nut 5 contacts with the inner headed face of valve casing 3, and nut 5 is between spring base 4 and liquid inlet joint 8. as shown in Figure 3 and Figure 6, the first containing cavity, the second containing cavity 52 are coaxial with the 3rd containing cavity 53 three and connect, and the first containing cavity is formed on the end face of nut 5 and allows the sealing of liquid inlet joint 8 insert the opening in the first containing cavity. valve pad 7 is the circular block shape structure adopting polyurethane to make, the diameter of valve pad 7 is not less than the diameter of the second containing cavity 52, owing to the diameter of the first containing cavity is less than the diameter of the second containing cavity 52, first containing cavity and the second containing cavity 52 are formed a limited step, valve pad 7 is fill in the second containing cavity 52 after the 3rd containing cavity 53 when installing, valve pad 7 and with nut 5 interference fit, and in the second containing cavity 52, load screw plug 6, screw plug 6 is for closing the open-ended of the second containing cavity 52, screw plug 6 the clamping valve pad 7 that matches with limited step, realize the axial restraint of valve pad 7.
As it is shown on figure 3, as preferred, screw plug 6 for threadeding, is provided with external screw thread at screw plug 6 outer surface with nut 5 accordingly, and the inner surface in the 3rd containing cavity 53 of nut 5 is provided with female thread. Screw plug 6 is arranged to threaded with nut 5, easy disassembly screw plug 6, in order to valve pad 7 is replaced.
As shown in Figure 3 and Figure 6, as preferably, the end face facing liquid inlet joint 8 of nut 5 is provided with and allows fluid pass through and fluid is guided the oil duct 55 to outage 31, and this oil duct 55 is for start the groove along the periphery extending radially to nut 5 of nut 5 from the first containing cavity. By arranging oil duct 55 on the end face of nut 5, when valve pad 7 and hermetic unit from after, the fluid flowing to from inlet opening in unloading cavity is guided to outage 31 by oil duct 55, is conducive to relief valve to realize the quick overflow of short time.
As depicted in figs. 1 and 2, as preferably, oil duct 55 is equal with the quantity of outage 31 and aligned in position, oil duct 55 on the end face of nut 5 for being uniformly distributed circumferentially. At valve casing 3 axially, outage 31 between spring base 4 and joint body 81, each oil duct 55 respectively with outside outage 31 aligned in position and being positioned on the same RADIAL of valve casing 3.
As preferably, sealing is to embed the multi-stage stairs shape structure contacted in the first containing cavity of nut 5 and with valve pad 7, and such sealing can have multiple plane contact with core assembly, improves the reliability sealed.
As shown in Figure 4 and Figure 5, in the present embodiment, sealing is three grades of step-like structures, and sealing has and sets gradually and the first shaft part the 82, second shaft part 83 and the 3rd shaft part 84 that overall diameter is gradually increased, and first shaft part the 82, second shaft part 83 and the 3rd shaft part 84 three are coaxial. The end of the 3rd shaft part 84 and joint body 81 is for being fixedly and coaxially connected, and the overall diameter of the 3rd shaft part 84 is less than the overall diameter of joint body 81. First shaft part 82 and the second shaft part 83 are for embedding in the first containing cavity of nut 5, and the first shaft part 82 is to match with valve pad 7 and can carry out plane contact, and the overall diameter of the second shaft part 83 is not more than the diameter of a containing cavity.
As shown in Figure 4 and Figure 5, the length of the second shaft part 83 is not less than the degree of depth of the first containing cavity, and the end face to guarantee the first shaft part 82 can with the end contact of valve pad 7, it is achieved seal. Inlet opening forms the opening allowing fluid flow on the end face of the first shaft part 82, the end face of this end face of the first shaft part 82 namely the insertion end of liquid inlet joint 8. The overall diameter of the first shaft part 82 is less than the end face diameter of valve pad 7, so that it is guaranteed that the opening on the end face of the first shaft part 82 can be fully sealed by the end face of valve pad 7. And, when sealing contacts with core assembly, relief valve cuts out, now the end face of the first shaft part 82 and the end face of the second shaft part 83 all contact with valve pad 7, the end face of the 3rd shaft part 84 and the end contact of nut 5, the end face of the second shaft part 83 and the 3rd shaft part 84 is the plane that the end face with the first shaft part 82 is paralleled, and namely sealing has multiple plane to contact with core assembly realization sealing, good sealing effect, reliability is high. Further, since the face of employing structure crosses liquid mode, valve pad 7 is only limited by the end contact effect of liquid inlet joint 8, and the impact that valve pad 7 bears is little, long service life.
As preferably, as shown in Figure 6, the first containing cavity in nut 5 is divided into the path chamber 54 of cylinder and the chamber, big footpath 51 of cone, chamber, big footpath 51 has bigger diameter end and miner diameter end, the diameter of the miner diameter end in chamber, big footpath 51 is equal with the diameter in path chamber 54, and the miner diameter end in big chamber, footpath 51 is connected with path chamber 54. Chamber, big footpath 51 is coaxial with path chamber 54, path chamber 54 between chamber, big footpath 51 and the second containing cavity 52, the diameter of the bigger diameter end in chamber, big footpath 51 is more than the overall diameter of the second shaft part 83, and oil duct 55 is to start setting up from chamber, big footpath 51 and inner surface in chamber, big footpath 51 forms opening. It is uncovered that the nut of this structure has towards sealing, it is simple to sealing embeds, and fluid is had good water conservancy diversion effect by the inner surface of cone.
As preferably, as depicted in figs. 1 and 2, core assembly also includes the second sealing ring 10 being sheathed on nut 5, second sealing ring 10 is clipped between valve casing 3 and nut 5, second sealing ring 10 and between spring base 4 and outage 31, for realizing the sealing between unloading cavity and spring cavity 32, it is to avoid fluid flow in spring cavity 32 from the gap between nut 5 and valve casing 3, such that it is able to avoid corrosion back-moving spring 2.
As shown in Figure 7, the spring base 4 of resetting-mechanism is to be made up of guide section the 42, first boss 41 and the second boss 43, guide section 42 is circular block shape structure, and the first boss 41 and the second boss 43 are connected to form one at the side of guide section 42 and guide section 42 spring base 4 of structure respectively. first boss 41 and the second boss 43 are coaxial with guide section 42, and the first boss 41 is cylindrical, and the diameter of guide section 42 is more than the diameter of the first boss 41 and the second boss 43. back-moving spring 2 is helical spring, and the first boss 41 is for insertion in back-moving spring 2 one end of back-moving spring 2 is positioned. second boss 43 is spherical, allows the second boss 43 embed and for the hole, location 61 of cone, the locating surface fitted as the sphere with the second boss 43 of conical inner surface in hole 61, location as it is shown on figure 3, the end face center facing spring base 4 of screw plug 6 has. spring base 4 is owing to being clipped between back-moving spring 2 and core assembly, and spring base 4 diametrically and leaves gap (namely spring base 4 radially lacks support) between valve casing 3 inwall, spring base 4 is all applied active force vertically by core assembly and back-moving spring 2, match with the second boss 43 of spring base 4 by arranging the hole 61, location of cone in screw plug 6, form sphere-contact, may insure that spring base 4 uniform force, spring base 4 is made to be only limited by axial force, not by diametral interference, prevent from being caused back-moving spring 2 stuck or flexural deformation by radial force, improve reliability.
As shown in Figure 8 and Figure 9, two ends end face is to the valve pad 7 of plane, one end of valve pad 7 is towards sealing, and the plane that this end end face is the axis perpendicular with liquid inlet joint 8 of valve pad 7, when overflow opened by relief valve, during overflow, liquid produces shear flow when flowing out, and the center position of valve pad 7 can form negative pressure of vacuum pulling force, can cause that valve pad 7 pull-out was lost efficacy, affect the reliability of relief valve.
Accordingly, as variant embodiment, as shown in Figure 10 to Figure 13, valve pad 7 is the circular block shape structure adopting polyurethane to make, and one end of valve pad 7 is towards sealing, and this end end face of valve pad 7 is to be made up of a sealing surface 71 and an anchor ring 72. Anchor ring 72 is the annular plane with centre bore, and anchor ring 72 is for contacting with the internal face of the second containing cavity 52. Sealing surface 71 is arranged in the centre bore of anchor ring 72, and both are coaxial, and the outer rim of sealing surface 71 is connected the end face that formation is complete with the inner edge of anchor ring 72. As preferably, sealing surface 71 is sphere, forms a ball recess towards internal recess in the center, end of valve pad 7. Sealing surface 71 is to seal for the realization that matches with liquid inlet joint, the overall diameter of anchor ring 72 is not less than the diameter of the second containing cavity 52, the interior diameter of anchor ring 72 is more than the overall diameter of the second shaft part 83, guarantee that the area of sealing surface 71 is sufficiently large, guarantee when relief valve cuts out to keep in touch with the end face of the first shaft part 82, inlet opening is closed.
For having the valve pad 7 of the sealing surface 71 of indent, as shown in figure 11, owing to valve pad 7 has inner concave arc surface effect, highly pressurised liquid from liquid inlet joint can be divided into axial force Fr and radial force Fn on curved surface, compare the valve pad (Fig. 8 shown in) not having inner concave arc surface, it is possible to bear higher pressure. As shown in figure 12, owing to valve pad 7 has inner concave arc surface effect, the end face of liquid inlet joint leaves gap after contacting with sealing surface 71, and at this gap place, highly pressurised liquid is flowed into back action in liquid inlet joint by big cambered surface, can alleviate the pressure of liquid inlet joint end face. As shown in figure 13, when overflow opened by relief valve, under the sealing surface 71 of indent acts on, the unordered disorderly flowing of highly pressurised liquid, the active force that liquid contact surface is formed produces continuous so that what valve pad was stable is pressed on screw plug, it is to avoid the situation that pull-out was lost efficacy occurs in valve pad.
Above in association with accompanying drawing, the present invention is exemplarily described. Obviously, the present invention implements and is not subject to the restrictions described above. As long as have employed the improvement of the various unsubstantialities that the design of the method for the present invention carries out with technical scheme; Or not improved, the above-mentioned design of the present invention and technical scheme are directly applied to other occasion, all within protection scope of the present invention.
Claims (9)
1. the switching mechanism of overflow relief valve, including the liquid inlet joint with inlet opening, it is characterized in that: also include relatively described liquid inlet joint and may move and for controlling the core assembly of described inlet opening opening and closing, core assembly includes nut and the valve pad being arranged in nut, valve pad has the sealing surface for matching with liquid inlet joint, and sealing surface is sphere.
2. the switching mechanism of overflow relief valve according to claim 1, it is characterized in that: described liquid inlet joint includes joint body that the valve casing with overflow relief valve is connected and fixes the sealing being connected and matching with described core assembly with joint body, and valve casing has the outage being distributed in around sealing.
3. the switching mechanism of overflow relief valve according to claim 2, it is characterised in that: described joint body inserts in described valve casing and with described valve casing as threadeding.
4. the switching mechanism of overflow relief valve according to claim 1, it is characterized in that: described core assembly also includes screw plug, described nut has the first containing cavity for holding described sealing, holds the second containing cavity of described valve pad and for holding the 3rd containing cavity of screw plug, first containing cavity, the second containing cavity and the 3rd containing cavity are for setting gradually, and screw plug is used for closing the second containing cavity.
5. the switching mechanism of overflow relief valve according to claim 4, it is characterized in that: the end face of described nut is provided with for fluid is guided the oil duct to outage, when described valve pad and described hermetic unit from after, the fluid in described inlet opening flow to described outage place through oil duct.
6. the switching mechanism of overflow relief valve according to claim 5, it is characterised in that: described oil duct and described outage are positioned on the same RADIAL of described valve casing.
7. the switching mechanism of overflow relief valve according to claim 4, it is characterized in that: described sealing is to embed the ledge structure contacted in the first containing cavity of described nut and with described valve pad, and the diameter of described second containing cavity is more than the diameter of the first containing cavity.
8. the switching mechanism of overflow relief valve according to claim 4, it is characterized in that: described sealing has and sets gradually and the first shaft part, the second shaft part and the 3rd shaft part that overall diameter is gradually increased, 3rd shaft part is fixing with described joint body to be connected, first shaft part matches with described valve pad, and the overall diameter of the second shaft part is not more than the diameter of a described containing cavity.
9. the switching mechanism of overflow relief valve according to claim 8, it is characterised in that: the length of described second shaft part is not less than the degree of depth of described first containing cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610051961.4A CN105626119A (en) | 2016-01-25 | 2016-01-25 | Switching mechanism of overflow safety valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610051961.4A CN105626119A (en) | 2016-01-25 | 2016-01-25 | Switching mechanism of overflow safety valve |
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| CN105626119A true CN105626119A (en) | 2016-06-01 |
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| CN201610051961.4A Pending CN105626119A (en) | 2016-01-25 | 2016-01-25 | Switching mechanism of overflow safety valve |
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| CN203515616U (en) * | 2013-09-05 | 2014-04-02 | 浙江长河机械制造有限公司 | 500L/min safety valve used for coal mine hydraulic support |
| CN203823171U (en) * | 2014-05-19 | 2014-09-10 | 大连理工安全装备有限公司 | Low-temperature safety valve |
| CN203905970U (en) * | 2014-02-10 | 2014-10-29 | 深圳市神拓机电设备有限公司 | High-flow column relief valve |
| CN104373141A (en) * | 2014-09-09 | 2015-02-25 | 深圳市神拓机电设备有限公司 | Safety valve with conical surface sealing structure |
| CN204512563U (en) * | 2015-03-25 | 2015-07-29 | 扬州双良阀门有限公司 | Modified model spring micro-opening safety valve |
| CN204628570U (en) * | 2015-01-27 | 2015-09-09 | 陈春景 | Multi-layer sealed Multifunctional stop valve |
| CN204677215U (en) * | 2015-03-27 | 2015-09-30 | 丰隆液压有限公司 | A kind of liquids double-rows pilot-operated type high-flow safety valve |
| CN105257323A (en) * | 2014-07-14 | 2016-01-20 | 巨隆集团芜湖兴隆液压有限公司 | Medium-flow safety valve |
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| CN201487330U (en) * | 2009-09-15 | 2010-05-26 | 刘斌 | Straight-seat-type spring micro-opening safety valve |
| CN201599463U (en) * | 2009-12-25 | 2010-10-06 | 大连理工安全技术与控制工程研究中心有限公司 | Mini full lift safety valve |
| CN203515616U (en) * | 2013-09-05 | 2014-04-02 | 浙江长河机械制造有限公司 | 500L/min safety valve used for coal mine hydraulic support |
| CN203905970U (en) * | 2014-02-10 | 2014-10-29 | 深圳市神拓机电设备有限公司 | High-flow column relief valve |
| CN203823171U (en) * | 2014-05-19 | 2014-09-10 | 大连理工安全装备有限公司 | Low-temperature safety valve |
| CN105257323A (en) * | 2014-07-14 | 2016-01-20 | 巨隆集团芜湖兴隆液压有限公司 | Medium-flow safety valve |
| CN104373141A (en) * | 2014-09-09 | 2015-02-25 | 深圳市神拓机电设备有限公司 | Safety valve with conical surface sealing structure |
| CN204628570U (en) * | 2015-01-27 | 2015-09-09 | 陈春景 | Multi-layer sealed Multifunctional stop valve |
| CN204512563U (en) * | 2015-03-25 | 2015-07-29 | 扬州双良阀门有限公司 | Modified model spring micro-opening safety valve |
| CN204677215U (en) * | 2015-03-27 | 2015-09-30 | 丰隆液压有限公司 | A kind of liquids double-rows pilot-operated type high-flow safety valve |
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