CN105673057A - Opening and closing mechanism of safety valve - Google Patents
Opening and closing mechanism of safety valve Download PDFInfo
- Publication number
- CN105673057A CN105673057A CN201610051871.5A CN201610051871A CN105673057A CN 105673057 A CN105673057 A CN 105673057A CN 201610051871 A CN201610051871 A CN 201610051871A CN 105673057 A CN105673057 A CN 105673057A
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- Prior art keywords
- valve
- containing cavity
- relief valve
- liquid inlet
- swivel nut
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- 239000007788 liquid Substances 0.000 claims abstract description 52
- 238000007789 sealing Methods 0.000 claims description 63
- 239000012530 fluid Substances 0.000 claims description 21
- 230000004308 accommodation Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 239000003245 coal Substances 0.000 description 4
- 238000000034 method Methods 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
- 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
- 230000002301 combined effect 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
- 210000001503 joint Anatomy 0.000 description 1
- 230000002045 lasting effect Effects 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
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/50—Component parts or details of props
- E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
- E21D15/512—Arrangement of valves
-
- 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)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses an opening and closing mechanism of a safety valve. The opening and closing mechanism comprises a liquid inlet connector provided with a liquid inlet, and further comprises a vale element assembly which can move relative to the liquid inlet connector and is used for controlling the opening and closing of the liquid inlet, wherein the valve element assembly comprises a sliding seat, a screw sleeve arranged in the sliding seat and a valve pad arranged in the screw sleeve; and the valve pad is provided with a recessed structure. According to the opening and closing mechanism with the valve element assembly, the movable valve element assembly is arranged and matched with the liquid inlet connector and can be used for controlling the opening and closing of an oil path from the liquid inlet to a liquid outlet; after the valve element assembly is far away from the liquid inlet connector, high-flow overflow can be realized, so that the flow of the safety valve is greatly increased; the short-time quick overflow can reduce the axial displacement of the valve element assembly, and the reduction of the axial displacement of the valve element assembly can enable the axial deformation of a reset spring to be reduced, so that the pressure fluctuation can be reduced finally.
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 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 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 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 sliding seat, be arranged in sliding seat swivel nut and the valve pad being arranged in swivel nut, valve pad has sunk structure.
Described liquid inlet joint includes joint body that the valve body with relief valve is connected and fixes the sealing being connected and matching with described core assembly with joint body, and valve body has outage, and outage is distributed in around sealing.
Described joint body inserts in described valve body and with described valve body as threadeding.
Described valve pad is fixedly clamped by described sliding seat and described swivel nut.
Described swivel nut have for the first containing cavity holding described sealing with hold described valve pad and the second containing cavity of connect with the first containing cavity, described sliding seat has the 3rd containing cavity of accommodation swivel nut.
The end face of described sliding seat is provided with for fluid is guided the first oil duct to outage, the end face of described swivel nut is provided with for fluid is guided the second oil duct to the first oil duct, when described valve pad and described hermetic unit from after, the fluid in described inlet opening flow to described outage place through the second oil duct, the first oil duct successively.
Described first oil duct, the second oil duct and described outage are positioned on the same RADIAL of described valve body.
Described sealing is to embed the ledge structure contacted in the first containing cavity of described swivel 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 that overall diameter is gradually increased and the second shaft part, second 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 first shaft part is not more than the diameter 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 relief valve with switching mechanism of the present invention;
Fig. 2 is the sectional view of core assembly;
Fig. 3 is the sectional view of liquid inlet joint;
Fig. 4 is the sectional view of sliding seat;
Fig. 5 is the side view of sliding seat;
Fig. 6 is the sectional view of swivel nut;
Fig. 7 is the side view of swivel nut;
Fig. 8 is the sectional view of valve body;
Fig. 9 is the sectional view of valve pad;
Figure 10 is the sectional view of spring base;
The valve pad that Figure 11 is the first structure coordinates schematic diagram with sealing;
Figure 12 is in the first structure valve pad during opening and coordinates schematic diagram with sealing;
Figure 13 is the sectional view of the valve pad of the second structure;
Figure 14 is in the stress schematic diagram of the second structure valve pad during closed mode;
When Figure 15 is in opening, the second structure valve pad coordinates schematic diagram with sealing;
Figure 16 is the sectional view of the valve pad of the third structure;
Figure 17 is in the stress schematic diagram of the third structure valve pad during closed mode;
Figure 18 is in the third structure valve pad during opening and coordinates schematic diagram with sealing;
Figure is labeled as:
1, voltage regulation screw; 2, back-moving spring;
3, valve body; 31, outage; 32, unloading cavity;
4, spring base; 41, the first boss; 42, guide section; 43, the first hole, location;
5, swivel nut; 51, chamber, big footpath; 52, path chamber; 53, the second containing cavity; 54, the second oil duct; 6, sliding seat; 61, the second hole, location; 62, the 3rd containing cavity; 63, the first oil duct;
7, valve pad; 71, inner bottom surface; 72, anchor ring; 73, sunk structure; 74, male cone (strobilus masculinus); 75, baseplane; 8, liquid inlet joint; 81, joint body; 82, the first shaft part; 83, the second shaft part; 84, inlet opening; 9, valve casing; 10, spheroid; 11, the first sealing ring; 12, 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 10, for adopting a kind of relief valve of switching mechanism of the present invention, this relief valve includes having the valve body 3 of outage 31, has valve casing 9 that the liquid inlet joint 8 of inlet opening 84 is connected with valve body 3 and be arranged at the resetting-mechanism within valve casing 9, and inlet opening 84 is connected with outage 31 by the unloading cavity 32 within valve body 3 and three forms the overflow ducts of relief valve. In order to solve problem existing in prior art, 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 illustrated in figures 1 and 8, liquid inlet joint 8, valve body 3 and valve casing 9 are the cylindrical member of both ends open, inner hollow, liquid inlet joint 8 is inserted in the one end of valve body 3 and with valve body 3 as threadeding, the other end of valve body 3 insert the one end of valve casing 9 interior and with valve casing 9 for threadeding. valve casing 9 is internal has the spring cavity 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 84 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 at the other end of valve casing 9 and threaded with valve casing 9, 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 9 by the promotion of back-moving spring 2 and core assembly in valve casing 9, 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 shown in figures 1 and 3, liquid inlet joint 8 is for the such as hydraulic cylinder socket connection of the Hydraulic Elements with coal mine fully-mechanized mining hydraulic support, as shown in figures 1 and 3, liquid inlet joint 8 includes with valve body 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 terminal interior surface of valve body 3 accordingly. Inlet opening 84 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 body 3 inside and for matching with core assembly, to control the break-make of overflow ducts.
As illustrated in figures 1 and 8, it is positioned at the part cavity inside joint body 81 as the unloading cavity 32 allowing fluid pass through within valve body 3, outage 31 connects with unloading cavity 32, owing to the relative liquid inlet joint 8 of core assembly is moveable, then and the adjustable volume of unloading cavity 32. Sealing is by realizing the closedown of inlet opening 84 with contacting of core assembly, and now unloading cavity 32 volume is minimum, and inlet opening 84 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 32 is gradually increased, and inlet opening 84 can pass through unloading cavity 32 and connect with outage 31, and overflow ducts turns on, and relief valve realizes opening. Therefore, relief valve is moved axially by core assembly, realize the control of overflow ducts break-make, and connect inlet opening 84 and outage 31 by unloading cavity 32, unloading cavity 32 volume is big, big flow overflow can be realized when overflow ducts turns on, it is little that fluid in inlet opening 84 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 in valve body 3 can complete breakdown action. And the axial displacement of core assembly is reduced, when the relief valve of the relief valve with prior art with switching mechanism of the present invention adopts the back-moving spring 2 with identical coefficient of elasticity, the stroke with back-moving spring 2 in the relief valve of switching mechanism 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 illustrated in figures 1 and 8, outage 31 is arranged on the sidewall of valve body 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 body 3, and all outages 31 is distributed in around the sealing of unloading cavity 32 and liquid inlet joint 8, so when relief valve is opened, the fluid in inlet opening 84 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 depicted in figs. 1 and 2, in core assembly includes the sliding seat 6 being movably arranged in valve body 3 inner chamber, the swivel nut 5 being arranged in sliding seat 6 and is arranged at swivel nut 5 and the valve pad 7 realizing sealing that matches with sealing, valve pad 7 and being fixedly clamped by sliding seat 6 and swivel nut 5.
As shown in Figure 2 and Figure 6, swivel nut 5 is the cylindrical structural of both ends open and inner hollow, the cavity at swivel nut 5 inside center place is for holding the first containing cavity of sealing and holding valve pad 7 and the second containing cavity 53 connected with the first containing cavity, first containing cavity and the second containing cavity 53 are for axially to set gradually along swivel nut 5, and diameter is for being gradually increased.One end of valve pad 7 is towards sealing, and the circular flat that this end end face is the axis perpendicular with liquid inlet joint 8 of valve pad 7, as it is shown in figure 9, valve pad 7 is by carrying out, with sealing, the control that plane contact realizes inlet opening 84 is closed, adopt flat seal form, good sealing effect.
As shown in Figure 2 and Figure 6, the first containing cavity and coaxial and connection both the second containing cavity 53, the first containing cavity forms the opening allowing the sealing of liquid inlet joint 8 insert on the end face of swivel nut 5. 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 53, owing to the diameter of the first containing cavity is less than the diameter of the second containing cavity 53, first containing cavity and the second containing cavity 53 are formed a limited step, valve pad 7 is fill in the second containing cavity 53 when installing, valve pad 7 and with swivel nut 5 interference fit, clamp valve pad 7 finally by sliding seat 6, it is achieved the axial restraint of valve pad 7.
As shown in Figure 2 and Figure 4, sliding seat 6 is the cylindrical structural coaxial with valve body 3 and swivel nut 5, the periphery of sliding seat 6 contacts with the inner headed face of valve body 3, and sliding seat 6 is between spring base 4 and liquid inlet joint 8, and it is internal that sliding seat 6 can move axially and can be inserted into valve casing 9 along valve body 3. Sliding seat 6 has the 3rd containing cavity 62 holding swivel nut 5, and the 3rd containing cavity 62 is for arranging in the end face center facing liquid inlet joint 8 of sliding seat 6 and towards the circular cavity extended to form inside sliding seat 6. After in valve pad 7 being installed and is plunged into the second containing cavity 53 of swivel nut 5, the swivel nut 5 with valve pad 7 is filled in the 3rd containing cavity 62 of sliding seat 6, the diapire of the 3rd containing cavity 62 until valve pad 7 is conflicted, clamp valve pad 7.
As in figure 2 it is shown, as preferred, swivel nut 5 inserts in the 3rd containing cavity 62 and with sliding seat 6 as threadeding, and is provided with external screw thread at swivel nut 5 outer surface accordingly, and the inner surface in the 3rd containing cavity 62 is provided with female thread. Swivel nut 5 is arranged to threaded with sliding seat 6, easy disassembly swivel nut 5, in order to valve pad 7 is replaced.
As shown in Figure 4 and Figure 5, as preferably, the end face facing liquid inlet joint 8 of sliding seat 6 is provided with and allows fluid pass through and fluid is guided the first oil duct 63 to outage 31, and this first oil duct 63 is for start the groove along the periphery extending radially to sliding seat 6 of sliding seat 6 from the 3rd containing cavity 62. As shown in Figure 6 and Figure 7, the end face facing liquid inlet joint 8 of swivel nut 5 is provided with and allows fluid pass through and fluid is guided the second oil duct 54 to the first oil duct 63, this second oil duct 54 is for start the groove along the periphery extending radially to swivel nut 5 of swivel nut 5 from the first containing cavity, first oil duct 63 connects with the second oil duct 54, and diametrically, the first oil duct 63 is between outage 31 and the second oil duct 54. By arranging oil duct on the end face of swivel nut 5 and sliding seat 6, when valve pad 7 and hermetic unit from after, the fluid flowing to from inlet opening 84 in unloading cavity 32 is guided to outage 31 by these oil ducts, is conducive to relief valve to realize the quick overflow of short time.
As depicted in figs. 1 and 2, as preferably, first oil duct the 63, second oil duct 54 is equal with the quantity of outage 31 and aligned in position, the first oil duct 63 and the second oil duct 54 respectively on the end face of sliding seat 6 and swivel nut 5 for being uniformly distributed circumferentially. At valve body 3 axially, outage 31 is between spring base 4 and joint body 81, each oil duct respectively with outside outage 31 aligned in position and be positioned on the same RADIAL of valve body 3, when valve pad 7 and hermetic unit from after, the fluid in inlet opening 84 flow to outage 31 place through second oil duct the 54, first oil duct 63 successively.
As preferably, sealing is to embed the multi-stage stairs shape structure contacted in the first containing cavity of swivel 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 figures 1 and 3, in the present embodiment, sealing is two-stage step-like structure, and sealing has and sets gradually and the first shaft part 82 and the second shaft part 83 that overall diameter is gradually increased, and both the first shaft part 82 and the second shaft part 83 are coaxial. The end of the second shaft part 83 and joint body 81 is for being fixedly and coaxially connected, and the overall diameter of the second shaft part 83 is less than the overall diameter of joint body 81. First shaft part 82 is for embedding in the first containing cavity of swivel 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 first shaft part 82 is not more than the diameter of a containing cavity.
As shown in figures 1 and 3, the length of the first shaft part 82 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 84 forms the opening allowing fluid flow out 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 contacts with valve pad 7, the end contact of the end face of the second shaft part 83 and swivel nut 5 and sliding seat 6, the end face of the first shaft part 82 and the second shaft part 83 is the plane that the end face with swivel nut 5, sliding seat 6 and valve pad 7 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 swivel nut 5 is divided into the path chamber 52 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 52, and the miner diameter end in big chamber, footpath 51 is connected with path chamber 52. Chamber, big footpath 51 is coaxial with path chamber 52, path chamber 52 between chamber, big footpath 51 and the second containing cavity 53, the diameter of the bigger diameter end in chamber, big footpath 51 is more than the overall diameter of the first shaft part 82, and the second oil duct 54 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 swivel nut 5 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 shown in Figure 1, core assembly also includes the second sealing ring being sheathed on sliding seat 6, second sealing ring is clipped between valve body 3 and sliding seat 6, second sealing ring and between spring base 4 and outage 31, for realizing the sealing between unloading cavity 32 and spring cavity, it is to avoid fluid flow in spring cavity from the gap between sliding seat 6 and valve body 3, such that it is able to avoid corrosion back-moving spring 2.
As shown in Figure 10, the spring base 4 of resetting-mechanism is to be made up of guide section 42 and the first boss 41, guide section 42 is circular block shape structure, and the first boss 41 is connected to form one at the center, side of guide section 42 and guide section 42 spring base 4 of structure, and the first boss 41 protrudes towards voltage regulation screw 1.First boss 41 is 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. 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, and voltage regulation screw 1 has for inserting the boss in back-moving spring 2, the other end of back-moving spring 2 positioned.
As shown in Fig. 1 and Figure 10, resetting-mechanism also includes the spheroid 10 being clipped between spring base 4 and sliding seat 6, spheroid 10 is complete ball, and the effect of spheroid 10 is to make spring base 4 and sliding seat 6 have good adaptivity in moving process, makes spring base 4 have good in disposition. the end face center facing sliding seat 6 of spring base 4 has to be allowed spheroid 10 embed and positions hole 43 for conical first, the end face center facing spring base 4 of sliding seat 6 has to be allowed spheroid 10 embed and positions hole 61 for conical second, the locating surface that the conical inner surface in the first hole, location 43 and the second hole 61, location is fitted as the sphere with spheroid 10. 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 9 inwall, spring base 4 is all applied active force vertically by core assembly and back-moving spring 2, match with spheroid 10 by arranging the hole, location of cone in spring base 4 and sliding seat 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 is illustrated by figs. 11 and 12, 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.
Therefore, as variant embodiment, as shown in FIG. 13 to 15, valve pad 7 is the circular block shape structure adopting polyurethane to make, one end of valve pad 7 is towards sealing, and this end end face of valve pad 7 is to be made up of an inner bottom surface 71 and a sealing surface 72, this end end face of valve pad 7 forms the sunk structure 73 towards valve pad 7 internal recess. Sealing surface 72 is the annular plane with centre bore, and sealing surface 72 is for contacting with the internal face of the second containing cavity 53, and the end face for the first shaft part 82 with liquid inlet joint keeps in touch, and is closed by inlet opening. Inner bottom surface 71 is arranged in the centre bore of sealing surface 72, and both are coaxial, and the outer rim of inner bottom surface is connected the end face that formation is complete with the inner edge of sealing surface 72. As preferably, inner bottom surface 71 is sphere, forms a ball recess towards internal recess in the center, end of valve pad 7, namely forms sunk structure 73. Sealing surface 72 is to seal for the realization that matches with liquid inlet joint, the overall diameter of sealing surface 72 is not less than the diameter of the second containing cavity 53, the overall diameter of sealing surface 72 is more than the overall diameter of the first shaft part 82, the interior diameter of sealing surface 72 is not more than the overall diameter of the first shaft part 82, so guarantee when relief valve cuts out that sealing surface 72 can keep in touch with the end face of the first shaft part 82, inlet opening is closed.
For having the valve pad 7 of sunk structure, as shown in figure 14, owing to valve pad 7 has inner concave arc surface effect, highly pressurised liquid from liquid inlet joint can be divided into axial thrust load Fn and radial component Fr on curved surface, component Fr with under the combined effect of the directed force F a produced by support member at cylindrical and the back side and Fb, butt joint seals position and produces extruding force, and increase with fluid pressure and increase, and plane valve pad cannot produce such effect, therefore compare the valve pad (Fig. 9 shown in) not having sunk structure, it is possible to bear higher pressure.As shown in figure 15, when also big flow overflow opened by relief valve, valve pad is because of the reflection of inner concave arc surface, the highly pressurised liquid of flowing produces unordered disorderly flowing in the central area of valve pad, valve pad contact surface is formed lasting pressure effect by the pressure fluid of this unordered disorderly flowing so that what valve pad was stable is pressed on supporting surface behind; If valve pad surface is plane, during overflow, liquid can directly radially flow out in direction, and negative pressure of vacuum region is formed in valve pad center, valve pad can be produced pulling force effect and cause valve pad to leave supporting surface behind until being drawn out damage and causing seal failure by the liquid of this negative pressure region.
Sunk structure 73 is except for except spherical, can also be other shapes, as shown in figure 16, as the variant embodiment to valve pad shown in Figure 13, relative to the structure difference place of valve pad shown in Figure 13, the structure of the valve pad 7 of this structure is in that the shape of sunk structure 73 is different, remainder is all identical. The sunk structure 73 of the valve pad 7 of this structure is cone-shaped groove, inner bottom surface is to be made up of male cone (strobilus masculinus) 74 and baseplane 75, and male cone (strobilus masculinus) 74 is taper seat, and male cone (strobilus masculinus) 74 is arranged in the centre bore of sealing surface 72, both are coaxial, and the outer rim of male cone (strobilus masculinus) 74 is connected with the inner edge of sealing surface 72. Male cone (strobilus masculinus) 74 has bigger diameter end and miner diameter end, and the bigger diameter end of male cone (strobilus masculinus) 74 is connected with the inward flange of sealing surface 72, and miner diameter end is connected with the outward flange of baseplane 75. Baseplane 75 is the disk coaxial with sealing surface 72, and baseplane 75 is arranged in the centre bore of male cone (strobilus masculinus) 74, and both are coaxial, and the outer rim of male cone (strobilus masculinus) 74 is connected with the bigger diameter end outer rim of inner conical surface 73, and forms complete end face with sealing surface 72. Shown in the valve pad of structure shown in Figure 16 and Figure 13, the valve pad of structure has identical effect, as shown in Figure 17 and Figure 18, does not repeat them here.
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 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 sliding seat, be arranged in sliding seat swivel nut and the valve pad being arranged in swivel nut, valve pad has sunk structure.
2. the switching mechanism of relief valve according to claim 1, it is characterized in that: described liquid inlet joint includes joint body that the valve body with relief valve is connected and fixes the sealing being connected and matching with described core assembly with joint body, valve body has outage, and outage is distributed in around sealing.
3. the switching mechanism of relief valve according to claim 2, it is characterised in that: described joint body inserts in described valve body and with described valve body as threadeding.
4. the switching mechanism of relief valve according to claim 2, it is characterised in that: described valve pad is fixedly clamped by described sliding seat and described swivel nut.
5. the switching mechanism of relief valve according to claim 2, it is characterized in that: described swivel nut have for the first containing cavity holding described sealing with hold described valve pad and the second containing cavity of connect with the first containing cavity, described sliding seat has the 3rd containing cavity of accommodation swivel nut.
6. the switching mechanism of relief valve according to claim 2, it is characterized in that: the end face of described sliding seat is provided with for fluid is guided the first oil duct to outage, the end face of described swivel nut is provided with for fluid is guided the second oil duct to the first oil duct, when described valve pad and described hermetic unit from after, the fluid in described inlet opening flow to described outage place through the second oil duct, the first oil duct successively.
7. the switching mechanism of relief valve according to claim 6, it is characterised in that: described first oil duct, the second oil duct and described outage are positioned on the same RADIAL of described valve body.
8. the switching mechanism of the relief valve according to claim 1 to 7, it is characterized in that: described sealing is to embed the ledge structure contacted in the first containing cavity of described swivel nut and with described valve pad, and the diameter of described second containing cavity is more than the diameter of the first containing cavity.
9. the switching mechanism of the relief valve according to claim 1 to 8, it is characterized in that: described sealing has and sets gradually and the first shaft part that overall diameter is gradually increased and the second shaft part, second 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 first shaft part is not more than the diameter of described first containing cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610051871.5A CN105673057A (en) | 2016-01-25 | 2016-01-25 | Opening and closing mechanism of safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610051871.5A CN105673057A (en) | 2016-01-25 | 2016-01-25 | Opening and closing mechanism of safety valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105673057A true CN105673057A (en) | 2016-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610051871.5A Pending CN105673057A (en) | 2016-01-25 | 2016-01-25 | Opening and closing mechanism of safety valve |
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|---|---|---|---|---|
| CN2242376Y (en) * | 1995-12-11 | 1996-12-11 | 姜立 | Valve for LPG bottle |
| CN2298390Y (en) * | 1997-04-24 | 1998-11-25 | 柳州第二空气压缩机总厂 | Safety valve |
| CN2388434Y (en) * | 1999-04-20 | 2000-07-19 | 刘洪刚 | Stop valve for gas pipeline |
| CN201474710U (en) * | 2009-04-30 | 2010-05-19 | 王润宏 | Large-flow relief valve |
| DE202009004753U1 (en) * | 2009-04-29 | 2010-09-16 | Bucyrus Europe Gmbh | Pressure relief valve |
| CN202469103U (en) * | 2012-03-07 | 2012-10-03 | 浙江华东矿用设备有限公司 | Safety valve |
| CN104153795A (en) * | 2014-08-06 | 2014-11-19 | 巨隆集团芜湖兴隆液压有限公司 | Safety valve |
| CN204677839U (en) * | 2015-06-12 | 2015-09-30 | 宁德景腾橡胶工业有限公司 | A kind of spring micro-opening closes high voltage type Decompression valves |
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2016
- 2016-01-25 CN CN201610051871.5A patent/CN105673057A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2242376Y (en) * | 1995-12-11 | 1996-12-11 | 姜立 | Valve for LPG bottle |
| CN2298390Y (en) * | 1997-04-24 | 1998-11-25 | 柳州第二空气压缩机总厂 | Safety valve |
| CN2388434Y (en) * | 1999-04-20 | 2000-07-19 | 刘洪刚 | Stop valve for gas pipeline |
| DE202009004753U1 (en) * | 2009-04-29 | 2010-09-16 | Bucyrus Europe Gmbh | Pressure relief valve |
| CN201474710U (en) * | 2009-04-30 | 2010-05-19 | 王润宏 | Large-flow relief valve |
| CN202469103U (en) * | 2012-03-07 | 2012-10-03 | 浙江华东矿用设备有限公司 | Safety valve |
| CN104153795A (en) * | 2014-08-06 | 2014-11-19 | 巨隆集团芜湖兴隆液压有限公司 | Safety valve |
| CN204677839U (en) * | 2015-06-12 | 2015-09-30 | 宁德景腾橡胶工业有限公司 | A kind of spring micro-opening closes high voltage type Decompression valves |
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Application publication date: 20160615 |
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