CN109555898B - Valve gate - Google Patents
Valve gate Download PDFInfo
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- CN109555898B CN109555898B CN201811486210.0A CN201811486210A CN109555898B CN 109555898 B CN109555898 B CN 109555898B CN 201811486210 A CN201811486210 A CN 201811486210A CN 109555898 B CN109555898 B CN 109555898B
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- annular
- packing
- sealing
- sealing ring
- valve
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
Abstract
The invention provides a valve, which is characterized in that a valve rod is tightly connected with an actuating mechanism through the cooperation of a connecting piece and a bolt, so that the assembly clearance between the valve rod and the actuating mechanism is reduced; the sealing element prevents corrosive liquid from easily flowing into an assembly gap between the valve rod and the valve core to corrode threads on the valve rod; the upper end surface of the valve core is abutted against the sealing element, and the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring are abutted against each other to form multiple sealing; the compression amount of the packing assembly is reasonably controlled by arranging the scale, so that the packing assembly is prevented from being pressed too loosely or too tightly; the upper packing group, the middle packing group and the lower packing group form multiple sealing, so that the sealing performance of the packing is improved; through the structures of the first packing ring, the second packing ring and the third packing ring, the pressing force of the gland in the vertical direction is changed into axial force and radial force by utilizing the annular inclined surface, the deformation of the packing group is increased, and the packing group is pressed and tightly attached to the valve rod.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a valve.
Background
The valve is used as a fluid conveying component and has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like. Valves used in fluid control systems range in variety and size from the simplest shut-off valves to valves used in complex autonomous systems. The valve can be used for controlling the flow control device of various types of fluids such as air, water, steam, various corrosive media of food processing and pharmaceutical machinery, slurry, oil products, liquid metal, radioactive media and the like.
The valve includes valve body, case, valve rod, guarantees sealedly in order to make the motion piece valve rod in operating condition, need set up the packing between valve body upper portion and valve rod and seal, and current valve has following problem:
firstly, the sealing between the valve body and the valve rod is usually sealed by adopting a bolt screwing type stuffing box, and the stuffing structure generally has the defects of poor sealing property of stuffing, so that the reliability of valve sealing is influenced;
secondly, the valve rod is generally connected with the valve core through threads, certain assembly gaps exist in the threaded connection between the valve rod and the valve core, corrosive liquid easily flows into the gaps to corrode the threads on the valve rod, and the connection between the valve rod and the threaded hole becomes loose;
and thirdly, one end of the valve rod connected with the actuating mechanism adopts a plug-in structure, the end face of the valve rod is provided with a slot, the actuating mechanism is provided with a cutting matched with the slot, the cutting is inserted into the slot to realize connection and axial positioning, but gaps exist between the cutting and the slot and the matching, and the valve rod and the actuating mechanism are easy to collide and abrade.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the valve which has the characteristics of good sealing property, good corrosion resistance and small assembly clearance.
The technical scheme for solving the problems comprises the following steps: a valve comprises a valve body, a valve rod, a valve core, a sealing element, a valve cover, a packing assembly and a gland;
the upper end surface of the valve body is provided with a first flange plate, the lower end surface of the valve cover is provided with a second flange plate, and the fastening piece penetrates through the first flange plate and the second flange plate and is in threaded connection with the valve body and the valve cover; the valve rod penetrates through the valve cover and the valve body; the valve core is positioned in the valve body, a packing cavity is arranged between the valve rod and the valve body, and a packing assembly is arranged in the packing cavity;
the valve rod is provided with a limiting table, and the limiting table and the valve rod are connected into an integral structure; the valve rod is provided with a first mounting area and a second mounting area, the first mounting area is positioned below the limiting table, and the second mounting area is positioned above the limiting table; the first mounting area is provided with threads, and the valve rod is in threaded connection with the valve core through the first mounting area; a sealing element is arranged between the valve core and the limiting table, the upper end surface of the sealing element is abutted against the lower end surface of the limiting table, and the lower end surface of the sealing element is abutted against the upper end surface of the valve core;
the second mounting area is provided with a threaded hole, and the central axis of the threaded hole is vertical to the central axis of the valve rod; the second mounting area is provided with a plurality of connecting pieces which are annularly arrayed around the central axis of the valve rod;
the connecting piece is of a symmetrical structure and comprises an A surface, a B surface and a C surface;
the surface A is an inwards concave arc surface, a plurality of connecting blocks are arranged on the surface A and the surface B respectively, the connecting blocks are parallel to each other, one end of each connecting block is connected with the surface A into a whole, and the other end of each connecting block is an inclined surface; the projection of the surface C on the horizontal plane is V-shaped, and the two ends of the surface C are respectively connected with the surface A and the surface B into a whole;
the sealing element comprises a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring, the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring are coaxially arranged, and the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring are all made of polytetrafluoroethylene;
a circular hole is formed in the first sealing ring, a first groove is formed in the lower end face of the first sealing ring, the first groove is of an annular structure, and the cross section of the first groove is in an arc shape;
a circular hole is formed in the second sealing ring, a first bulge is arranged on the upper end face of the second sealing ring, the first bulge is of an annular structure, and the cross section of the first bulge is in an arc shape; the upper end surface of the second sealing ring is abutted against the lower end surface of the first sealing ring, the first bulge is inserted into the first groove, and the first bulge is matched with the first groove;
the lower end face of the second sealing ring is provided with a main sealing surface which is of an annular structure, and the section of the main sealing surface is V-shaped;
a circular hole is formed in the third sealing ring, an upper sealing surface is arranged on the upper end face of the third sealing ring, the upper sealing surface is of an annular structure, and the section of the upper sealing surface is V-shaped; the upper sealing surface is abutted against the main sealing surface;
the lower end surface of the third sealing ring is provided with a lower sealing surface which is an inclined plane;
a circular hole is formed in the fourth sealing ring, an auxiliary sealing surface is arranged on the upper end face of the fourth sealing ring, and the auxiliary sealing surface is an inclined surface; the auxiliary sealing surface is abutted against the lower sealing surface;
the lower end face of the fourth sealing ring is arc-shaped, and the upper end face of the valve core is abutted against the lower end face of the fourth sealing ring.
The packing component is sleeved on the valve rod; a gland is arranged above the packing component, the lower end face of the gland abuts against the upper end face of the packing component, the gland is mounted on the upper end face of the valve cover through a bolt, a spring is arranged between the gland and the valve cover, and the spring is sleeved on the bolt; a scale is arranged on the upper end surface of the valve cover;
the packing assembly comprises a packing box, an upper packing group, a middle packing group and a lower packing group; the lower end face of the stuffing box is abutted against the bottom of the stuffing cavity;
the stuffing box is of a hollow cylindrical structure, a first annular bulge and a second annular bulge are arranged on the cylindrical surface in the stuffing box, and the first annular bulge is positioned above the second annular bulge;
a plurality of annular grooves are formed in the inner cylindrical surfaces of the first annular bulge and the second annular bulge, and the annular grooves are uniformly distributed along the central axis direction of the valve rod;
the upper packing group is positioned above the first annular bulge, the lower end face of the upper packing group is abutted against the upper end face of the first annular bulge, and the upper end face of the upper packing group is abutted against the lower end face of the gland; the upper packing group comprises a first packing ring, a second packing ring and a third packing ring; the first packing ring and the third packing ring are respectively positioned above and below the second packing ring;
the first packing ring is provided with a through hole, the lower end face of the first packing ring is provided with a first annular inclined plane, and the first annular inclined plane is connected with the through hole through a first annular plane; the first annular inclined surface inclines towards the upper end surface of the first packing ring; a first main annular groove is arranged on the first annular inclined surface, the first main annular groove is perpendicular to the first annular inclined surface, and the section of the first main annular groove is U-shaped; a first secondary annular groove is formed in the first annular plane, and the cross section of the first secondary annular groove is in an isosceles trapezoid shape;
the second packing ring is provided with a through hole, the valve rod penetrates through the through hole, the upper end surface of the second packing ring is provided with a second upper annular inclined surface, and the second upper annular inclined surface is connected with the through hole through a second upper annular plane; the second upper annular inclined surface is inclined towards the upper end surface of the second packing ring,
the second upper annular inclined surface is mutually attached to the first annular inclined surface, and the second upper annular plane is mutually attached to the first annular plane;
a main annular bulge is arranged on the second upper annular inclined surface and is vertical to the second upper annular inclined surface, and the section of the main annular bulge is rectangular; the main annular bulge is inserted into the first main annular groove and is matched with the first main annular groove;
an auxiliary annular bulge is arranged on the second upper annular plane, and the cross section of the auxiliary annular bulge is in an isosceles trapezoid shape; the auxiliary annular bulge is inserted into the first auxiliary annular groove, and the auxiliary annular bulge is matched with the first auxiliary annular groove;
a second lower annular inclined plane is arranged on the lower end face of the second packing ring and connected with the through hole through a second lower annular plane; the second lower annular inclined surface inclines towards the upper end surface of the second packing ring; a lower annular bulge is arranged on the second lower annular plane, and the section of the lower annular bulge is in an isosceles trapezoid shape;
a through hole is formed in the third packing ring, the valve rod penetrates through the through hole, a third annular inclined surface is arranged on the upper end surface of the third packing ring, and the third annular inclined surface is connected with the through hole through a third annular plane; the third annular inclined surface inclines towards the upper end surface of the third packing ring; the third annular inclined plane is mutually attached to the second lower annular inclined plane, and the third annular plane is mutually attached to the second lower annular plane;
a third annular groove is formed in the third annular plane, and the cross section of the third annular groove is in an isosceles trapezoid shape; the lower annular bulge is inserted into the third annular groove and is matched with the third annular groove;
the upper end surface of the middle filler group is abutted against the lower end surface of the first annular bulge, and the lower end surface of the middle filler group is abutted against the upper end surface of the second annular bulge;
the upper end surface of the lower packing group is abutted against the lower end surface of the second annular protrusion, and the lower end surface of the lower packing group is abutted against the bottom surface of the packing cavity; the structural composition of the lower packing group is completely the same as that of the upper packing group.
Further, the length of the connecting block is increased along with the decrease of the distance between the connecting block and the central axis of the valve rod; the length of the connecting piece is L1, and the length of the connecting piece gradually increases along the positive X direction.
Furthermore, the central angle subtended by the first groove section is equal to the central angle subtended by the first convex section, and the central angle subtended by the first groove section is larger than 180 degrees.
Furthermore, a sealing gasket is arranged between the lower end face of the packing box and the bottom of the packing cavity.
Furthermore, the first packing ring, the second packing ring and the third packing ring are all made of graphite materials.
Furthermore, the included angle between the first annular inclined plane and the horizontal plane is 5-30 degrees; the included angle between the second upper annular inclined plane and the horizontal plane is 5-30 degrees; the included angle between the second lower annular inclined plane and the horizontal plane is 5-30 degrees. The included angle between the third annular inclined plane and the horizontal plane is 5-30 degrees.
Furthermore, the first annular inclined surface, the second upper annular inclined surface, the second lower annular inclined surface and the third annular inclined surface are parallel to each other.
Further, the filling material group is a graphite asbestos rope.
Furthermore, an O-shaped sealing ring is arranged in each annular groove.
The invention has the following beneficial effects:
(1) according to the invention, the valve rod is tightly connected with the actuating mechanism through the cooperation of the connecting piece and the bolt, so that the assembly clearance between the valve rod and the actuating mechanism is reduced, and the abrasion and energy loss of parts are reduced;
(2) the sealing element prevents corrosive liquid from easily flowing into an assembly gap between the valve rod and the valve core to corrode threads on the valve rod, so that the connection between the valve rod and the threaded hole becomes loose; the upper end surface of the valve core is abutted against the sealing element, and the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring are abutted against each other to form multiple sealing, so that the sealing effect is further improved;
(3) the compression amount of the packing assembly is reasonably controlled by arranging the scale, so that the packing assembly is prevented from being pressed too loosely, a valve medium is prevented from leaking at the packing part, and the valve is prevented from being pressed too tightly, and the valve is prevented from being opened and closed difficultly due to overlarge friction force between the valve rod and the packing element;
(4) the upper packing group, the middle packing group and the lower packing group form multiple sealing, so that the sealing performance of the packing is improved, and the reliability and the sealing performance of the valve are improved; the structure of the first packing ring, the second packing ring and the third packing ring further improves the reliability of sealing, the pressing force of the gland in the vertical direction is changed into axial force and radial force by utilizing the annular inclined surface, the deformation of the packing group is increased, and the packing group is pressed to be tightly attached to the valve rod; the sealing reliability is further improved through the O-shaped sealing rings in the first annular bulge and the second annular bulge.
Drawings
FIG. 1 is a partial cross-sectional view of the present invention.
FIG. 2 is the connection structure of the valve rod, the actuating mechanism and the valve core.
Fig. 3 is a perspective view of the valve stem of the present invention.
Fig. 4 is a top view of the valve stem of the present invention.
Fig. 5 is a cross-sectional view of the seal of the present invention.
Fig. 6 is a cross-sectional view of a first seal ring of the present invention.
Fig. 7 is a cross-sectional view of a second seal ring of the present invention.
Fig. 8 is a cross-sectional view of a third seal ring of the present invention.
Fig. 9 is a cross-sectional view of a fourth seal ring of the present invention.
FIG. 10 is a cross-sectional view of a packing assembly of the present invention.
FIG. 11 is a cross-sectional view of an upper packing set in accordance with the present invention.
Figure 12 is a cross-sectional view of a first packing ring of the present invention.
Figure 13 is a cross-sectional view of a second packing ring of the present invention.
Figure 14 is a cross-sectional view of a third packing ring of the present invention.
In the figure: 1-a valve body, 2-a valve rod, 3-a valve cover, 4-a gland, 5-a packing component, 6-a first flange, 7-a second flange, 8-a packing cavity, 9-a spring, 10-a scale, 11-a packing box, 12-an upper packing set, 13-a lower packing set, 14-a sealing gasket, 15-an annular groove, 17-a first packing ring, 18-a second packing ring, 19-a third packing ring, 20-a through hole, 21-a first annular inclined surface, 22-a first annular plane, 23-a first main annular groove, 24-a first auxiliary annular groove, 25-a second upper annular inclined surface, 26-a second upper annular plane, 27-a main annular bulge, 28-an auxiliary annular bulge, 29-a second lower annular inclined surface, 30-a second lower annular flat surface, 31-a lower annular projection, 32-a third annular groove, 33-a first annular projection, 34-a second annular projection, 35-a filler group, 36-a third annular inclined surface, 37-a third annular flat surface, 102-a valve core, 103-a limit table, 104-a first mounting area, 105-a second mounting area, 106-a thread, 107-a sealing element, 109-a threaded hole, 110-a connecting element, 111-a surface, 112-B surface, 113-C surface, 114-an actuator, 115-a drive shaft, 116-a handwheel, 118-a first sealing ring, 119-a second sealing ring, 120-a third sealing ring, 121-a fourth sealing ring, 122-a circular hole, 123-a first groove, 124-a first projection, 125-primary sealing surface, 126-upper sealing surface, 127-lower sealing surface, 128-secondary sealing surface, 129-connecting block.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
A valve comprises a valve body 1, a valve rod 2, a valve core 102, a sealing element 107, a valve cover 3, a packing component 5 and a gland 4;
the upper end surface of the valve body 1 is provided with a first flange 6, the lower end surface of the valve cover 3 is provided with a second flange 7, and the fastening piece passes through the first flange 6 and the second flange 7 and is in threaded connection with the valve body 1 and the valve cover 3; the valve rod 2 penetrates through the valve cover 3 and the valve body 1, and the valve rod 2 is coaxially arranged with the valve cover 3 and the valve body 1; a packing cavity 8 is arranged between the valve rod 2 and the valve body 1, and a packing component 5 is arranged in the packing cavity 8;
the valve rod 2 is provided with a limiting table 103, and the limiting table 103 and the valve rod 2 are connected into an integral structure; a first mounting area 104 and a second mounting area 105 are arranged on the valve rod 2, the first mounting area 104 is positioned below the limiting table 103, and the second mounting area 105 is positioned above the limiting table 103; the first mounting area 104 is provided with threads 106, and the valve rod 2 is in threaded connection with the valve core 102 through the first mounting area 104; a sealing element 107 is arranged between the valve core 102 and the limit table 103, the upper end surface of the sealing element 107 is abutted against the lower end surface of the limit table 103, and the lower end surface of the sealing element 107 is abutted against the upper end surface of the valve core 102;
the second mounting area 105 is provided with a threaded hole 109, and the central axis of the threaded hole 109 is vertical to the central axis of the valve rod; a plurality of connectors 110 are arranged on the second mounting area 105, and the connectors 110 are annularly arrayed around the central axis of the valve rod;
the connecting piece 110 is a symmetrical structure, the connecting piece 110 comprises an A surface 111, a B surface 112 and a C surface 113, and the A surface 111 and the B surface 112 are symmetrical relative to the connecting piece 110; the surface A111 is an inward concave arc surface, a plurality of connecting blocks 129 are arranged on the surface A111 and the surface B112, the connecting blocks 129 are parallel to each other, one end of each connecting block 129 is connected with the surface A111 into a whole, and the other end of each connecting block 129 is an inclined surface; the length of the connecting block 129 increases as the distance of the connecting block 129 from the central axis of the valve stem decreases; the projection of the C surface 113 on the horizontal plane is V-shaped, and two ends of the C surface 113 are respectively connected with the A surface 111 and the B surface 112 into a whole; the length of the connecting piece 110 is L1, and the length of the connecting piece 110 gradually increases along the positive X direction;
the valve rod is connected with the actuating mechanism 114 through the second mounting area 105, the actuating mechanism 114 comprises a hand wheel 116 and a driving shaft 115, the upper end of the driving shaft 115 is connected with the hand wheel 116, the lower end face of the driving shaft 115 is provided with an insertion hole matched with the valve rod, the wall of the insertion hole is provided with a connecting groove matched with the connecting piece 110, the driving shaft 115 is provided with a mounting hole, and the central axis of the mounting hole is vertical to the central axis of the driving shaft 115; the upper end of the valve rod is inserted into the insertion hole, the connecting piece 110 is inserted into the connecting groove, the central axis of the threaded hole 109 is aligned with the central axis of the mounting hole, and the driving shaft 115 and the valve rod are connected through the bolt threads 106, so that the tight connection between the valve rod and the driving shaft 115 is ensured, and the assembly gap between the valve rod and the driving shaft 115 is reduced;
the sealing element 107 comprises a first sealing ring 118, a second sealing ring 119, a third sealing ring 120 and a fourth sealing ring 121, the first sealing ring 118, the second sealing ring 119, the third sealing ring 120 and the fourth sealing ring 121 are coaxially arranged, and the first sealing ring 118, the second sealing ring 119, the third sealing ring 120 and the fourth sealing ring 121 are all made of polytetrafluoroethylene;
a round hole 122 is formed in the first sealing ring 118, the valve rod penetrates through the round hole 122, a first groove 123 is formed in the lower end face of the first sealing ring 118, the first groove 123 is of an annular structure, the section of the first groove 123 is in an arc shape, and the central angle subtended by the section of the first groove 123 is 270 degrees;
a round hole 122 is formed in the second sealing ring 119, the valve rod penetrates through the round hole 122, a first protrusion 124 is arranged on the upper end face of the second sealing ring 119, the first protrusion 124 is of an annular structure, the cross section of the first protrusion 124 is in an arc shape, and the central angle subtended by the cross section of the first protrusion 124 is 270 degrees; the upper end surface of the second sealing ring 119 abuts against the lower end surface of the first sealing ring 118, the first protrusion 124 is inserted into the first groove 123, and the first protrusion 124 and the first groove 123 are matched with each other;
a main sealing surface 125 is arranged on the lower end surface of the second sealing ring 119, the main sealing surface 125 is of an annular structure, the section of the main sealing surface 125 is in a V shape, and one end of the main sealing surface 125 is connected with the circular hole 122; the other end is connected with the outer cylindrical surface of a second sealing ring 119;
a round hole 122 is formed in the third seal ring 120, the valve rod penetrates through the round hole 122, an upper seal surface 126 is arranged on the upper end surface of the third seal ring 120, the upper seal surface 126 is of an annular structure, the section of the upper seal surface 126 is V-shaped, one end of the upper seal surface 126 is connected with the round hole 122, and the other end of the upper seal surface 126 is connected with the outer cylindrical surface of the third seal ring 120; the upper sealing surface 126 abuts the main sealing surface 125;
a lower sealing surface 127 is arranged on the lower end face of the third sealing ring 120, the lower sealing surface 127 is an inclined plane, one end of the lower sealing surface 127 is connected with the circular hole 122, and the other end of the lower sealing surface 127 is connected with the outer cylindrical surface of the third sealing ring 120;
a round hole 122 is formed in the fourth sealing ring 121, the valve rod penetrates through the round hole 122, an auxiliary sealing surface 128 is arranged on the upper end face of the fourth sealing ring 121, the auxiliary sealing surface 128 is an inclined surface, one end of the auxiliary sealing surface 128 is connected with the round hole 122, and the other end of the auxiliary sealing surface 128 is connected with the outer cylindrical surface of the fourth sealing ring 121; the secondary sealing surface 128 abuts the lower sealing surface 127;
the lower end surface of the fourth sealing ring 121 is arc-shaped, and the upper end surface of the valve core 102 is abutted against the lower end surface of the fourth sealing ring 121; multiple sealing is formed among the first sealing ring 118, the second sealing ring 119, the third sealing ring 120 and the fourth sealing ring 121, and the sealing effect is improved.
The packing assembly 5 comprises a packing box 11, an upper packing set 12, a middle packing set 35 and a lower packing set 13; the lower end face of the stuffing box 11 abuts against the bottom of the stuffing cavity 8, and a sealing gasket 14 is arranged between the lower end face of the stuffing box 11 and the bottom of the stuffing cavity 8;
the stuffing box 11 is of a hollow cylindrical structure, a first annular bulge 33 and a second annular bulge 34 are arranged on the inner cylindrical surface of the stuffing box 11, and the first annular bulge 33 is positioned above the second annular bulge 34;
a plurality of annular grooves 15 are formed in the inner cylindrical surfaces of the first annular bulge 33 and the second annular bulge 34, the annular grooves 15 are uniformly distributed along the central axis direction of the valve rod 2, and an O-shaped sealing ring is arranged in each annular groove 15;
the upper packing group 12 is positioned above the first annular bulge 33, the lower end face of the upper packing group 12 abuts against the upper end face of the first annular bulge 33, and the upper end face of the upper packing group 12 abuts against the lower end face of the gland 4; the upper packing group 12 comprises a first packing ring 17, a second packing ring 18 and a third packing ring 19; the first packing ring 17 and the third packing ring 19 are respectively positioned above and below the second packing ring 18, the first packing ring 17, the second packing ring 18 and the third packing ring 19 are mutually overlapped, and the first packing ring 17, the second packing ring 18 and the third packing ring 19 are all made of graphite;
a through hole 20 is formed in the first packing ring 17, the valve rod 2 penetrates through the through hole 20, a first annular inclined surface 21 is arranged on the lower end surface of the first packing ring 17, and the first annular inclined surface 21 is connected with the through hole 20 through a first annular plane 22; the first annular inclined surface 21 inclines towards the upper end surface of the first packing ring 17, and the included angle between the first annular inclined surface 21 and the horizontal plane is 15 degrees; a first main annular groove 23 is formed in the first annular inclined surface 21, the first main annular groove 23 is perpendicular to the first annular inclined surface 21, and the section of the first main annular groove 23 is U-shaped; a first auxiliary annular groove 24 is formed in the first annular plane 22, and the cross section of the first auxiliary annular groove 24 is isosceles trapezoid;
a through hole 20 is formed in the second packing ring 18, the valve rod 2 penetrates through the through hole 20, a second upper annular inclined surface 25 is arranged on the upper end surface of the second packing ring 18, and the second upper annular inclined surface 25 is connected with the through hole 20 through a second upper annular plane 26; the second upper annular inclined surface 25 inclines towards the upper end surface of the second packing ring 18, and the included angle between the second upper annular inclined surface 25 and the horizontal plane is 15 degrees; the second upper annular inclined surface 25 is attached to the first annular inclined surface 21, and the second upper annular flat surface 26 is attached to the first annular flat surface 22;
a main annular bulge 27 is arranged on the second upper annular inclined surface 25, the main annular bulge 27 is perpendicular to the second upper annular inclined surface 25, and the section of the main annular bulge 27 is rectangular; the main annular bulge 27 is inserted into the first main annular groove 23, the main annular bulge 27 is matched with the first main annular groove 23, and the side surface of the main annular bulge 27 is tightly attached to the side surface of the first main annular groove 23;
an auxiliary annular bulge 28 is arranged on the second upper annular plane 26, and the cross section of the auxiliary annular bulge 28 is isosceles trapezoid; the auxiliary annular bulge 28 is inserted into the first auxiliary annular groove 24, the auxiliary annular bulge 28 is matched with the first auxiliary annular groove 24, and the side surface of the auxiliary annular bulge 28 is attached to the side surface of the first auxiliary annular groove 24;
a second lower annular inclined plane 29 is arranged on the lower end face of the second packing ring 18, and the second lower annular inclined plane 29 is connected with the through hole 20 through a second lower annular plane 30; the second lower annular inclined surface 29 inclines towards the upper end surface of the second packing ring 18, and the included angle between the second lower annular inclined surface 29 and the horizontal plane is 15 degrees; a lower annular bulge 31 is arranged on the second lower annular plane 30, and the section of the lower annular bulge 31 is in an isosceles trapezoid shape;
a through hole 20 is formed in the third packing ring 19, the valve rod 2 penetrates through the through hole 20, a third annular inclined surface 36 is arranged on the upper end surface of the third packing ring 19, and the third annular inclined surface 36 is connected with the through hole 20 through a third annular plane 37; the third annular inclined surface 36 inclines towards the upper end surface of the third packing ring 19, and the included angle between the third annular inclined surface 36 and the horizontal plane is 15 degrees; the third annular inclined surface 36 is attached to the second lower annular inclined surface 29, and the third annular flat surface 37 is attached to the second lower annular flat surface 30;
a third annular groove 32 is formed in the third annular plane 37, and the section of the third annular groove 32 is U-shaped; the lower annular protrusion 31 is inserted into the third annular groove 32, the lower annular protrusion 31 is matched with the third annular groove 32, and the side surface of the lower annular protrusion 31 is attached to the side surface of the third annular groove 32;
the upper end surface of the middle filler group 35 is abutted against the lower end surface of the first annular bulge 33, and the lower end surface of the middle filler group 35 is abutted against the upper end surface of the second annular bulge 34; the middle filler group 35 is made of graphite asbestos rope.
The upper end face of the lower packing group 13 is abutted against the lower end face of the second annular bulge 34, and the lower end face of the lower packing group 13 is abutted against the bottom face of the packing cavity 8; the lower packing set 13 has the same structural composition as the upper packing set 12.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (6)
1. A valve is characterized by comprising a valve body, a valve rod, a valve core, a sealing element, a valve cover, a packing component and a gland;
the upper end surface of the valve body is provided with a first flange plate, the lower end surface of the valve cover is provided with a second flange plate, and the fastening piece penetrates through the first flange plate and the second flange plate and is in threaded connection with the valve body and the valve cover; the valve rod penetrates through the valve cover and the valve body; the valve core is positioned in the valve body, a packing cavity is arranged between the valve rod and the valve body, and a packing assembly is arranged in the packing cavity;
the valve rod is provided with a limiting table, and the limiting table and the valve rod are connected into an integral structure; the valve rod is provided with a first mounting area and a second mounting area, the first mounting area is positioned below the limiting table, and the second mounting area is positioned above the limiting table; the first mounting area is provided with threads, and the valve rod is in threaded connection with the valve core through the first mounting area; a sealing element is arranged between the valve core and the limiting table, the upper end surface of the sealing element is abutted against the lower end surface of the limiting table, and the lower end surface of the sealing element is abutted against the upper end surface of the valve core;
the second mounting area is provided with a threaded hole, and the central axis of the threaded hole is vertical to the central axis of the valve rod; the second mounting area is provided with a plurality of connecting pieces which are annularly arrayed around the central axis of the valve rod;
the connecting piece is of a symmetrical structure and comprises an A surface, a B surface and a C surface;
the surface A is an inwards concave arc surface, a plurality of connecting blocks are arranged on the surface A and the surface B respectively, the connecting blocks are parallel to each other, one end of each connecting block is connected with the surface A into a whole, and the other end of each connecting block is an inclined surface; the projection of the surface C on the horizontal plane is V-shaped, and the two ends of the surface C are respectively connected with the surface A and the surface B into a whole;
the sealing element comprises a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring, the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring are coaxially arranged, and the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring are all made of polytetrafluoroethylene;
a circular hole is formed in the first sealing ring, a first groove is formed in the lower end face of the first sealing ring, the first groove is of an annular structure, and the cross section of the first groove is in an arc shape;
a circular hole is formed in the second sealing ring, a first bulge is arranged on the upper end face of the second sealing ring, the first bulge is of an annular structure, and the cross section of the first bulge is in an arc shape; the upper end surface of the second sealing ring is abutted against the lower end surface of the first sealing ring, the first bulge is inserted into the first groove, and the first bulge is matched with the first groove;
the lower end face of the second sealing ring is provided with a main sealing surface which is of an annular structure, and the section of the main sealing surface is V-shaped;
a circular hole is formed in the third sealing ring, an upper sealing surface is arranged on the upper end face of the third sealing ring, the upper sealing surface is of an annular structure, and the section of the upper sealing surface is V-shaped; the upper sealing surface is abutted against the main sealing surface;
the lower end surface of the third sealing ring is provided with a lower sealing surface which is an inclined plane;
a circular hole is formed in the fourth sealing ring, an auxiliary sealing surface is arranged on the upper end face of the fourth sealing ring, and the auxiliary sealing surface is an inclined surface; the auxiliary sealing surface is abutted against the lower sealing surface;
the lower end surface of the fourth sealing ring is arc-shaped, and the upper end surface of the valve core is abutted against the lower end surface of the fourth sealing ring;
the packing component is sleeved on the valve rod; a gland is arranged above the packing component, the lower end face of the gland abuts against the upper end face of the packing component, the gland is mounted on the upper end face of the valve cover through a bolt, a spring is arranged between the gland and the valve cover, and the spring is sleeved on the bolt; a scale is arranged on the upper end surface of the valve cover;
the packing assembly comprises a packing box, an upper packing group, a middle packing group and a lower packing group; the lower end face of the stuffing box is abutted against the bottom of the stuffing cavity;
the stuffing box is of a hollow cylindrical structure, a first annular bulge and a second annular bulge are arranged on the cylindrical surface in the stuffing box, and the first annular bulge is positioned above the second annular bulge;
a plurality of annular grooves are formed in the inner cylindrical surfaces of the first annular bulge and the second annular bulge, and the annular grooves are uniformly distributed along the central axis direction of the valve rod;
the upper packing group is positioned above the first annular bulge, the lower end face of the upper packing group is abutted against the upper end face of the first annular bulge, and the upper end face of the upper packing group is abutted against the lower end face of the gland; the upper packing group comprises a first packing ring, a second packing ring and a third packing ring; the first packing ring and the third packing ring are respectively positioned above and below the second packing ring;
the first packing ring is provided with a through hole, the lower end face of the first packing ring is provided with a first annular inclined plane, and the first annular inclined plane is connected with the through hole through a first annular plane; the first annular inclined surface inclines towards the upper end surface of the first packing ring; a first main annular groove is arranged on the first annular inclined surface, the first main annular groove is perpendicular to the first annular inclined surface, and the section of the first main annular groove is U-shaped; a first secondary annular groove is formed in the first annular plane, and the cross section of the first secondary annular groove is in an isosceles trapezoid shape;
the second packing ring is provided with a through hole, the valve rod penetrates through the through hole, the upper end surface of the second packing ring is provided with a second upper annular inclined surface, and the second upper annular inclined surface is connected with the through hole through a second upper annular plane; the second upper annular inclined surface is inclined towards the upper end surface of the second packing ring,
the second upper annular inclined surface is mutually attached to the first annular inclined surface, and the second upper annular plane is mutually attached to the first annular plane;
a main annular bulge is arranged on the second upper annular inclined surface and is vertical to the second upper annular inclined surface, and the section of the main annular bulge is rectangular; the main annular bulge is inserted into the first main annular groove and is matched with the first main annular groove;
an auxiliary annular bulge is arranged on the second upper annular plane, and the cross section of the auxiliary annular bulge is in an isosceles trapezoid shape; the auxiliary annular bulge is inserted into the first auxiliary annular groove, and the auxiliary annular bulge is matched with the first auxiliary annular groove;
a second lower annular inclined plane is arranged on the lower end face of the second packing ring and connected with the through hole through a second lower annular plane; the second lower annular inclined surface inclines towards the upper end surface of the second packing ring; a lower annular bulge is arranged on the second lower annular plane, and the section of the lower annular bulge is in an isosceles trapezoid shape;
a through hole is formed in the third packing ring, the valve rod penetrates through the through hole, a third annular inclined surface is arranged on the upper end surface of the third packing ring, and the third annular inclined surface is connected with the through hole through a third annular plane; the third annular inclined surface inclines towards the upper end surface of the third packing ring; the third annular inclined plane is mutually attached to the second lower annular inclined plane, and the third annular plane is mutually attached to the second lower annular plane;
a third annular groove is formed in the third annular plane, and the cross section of the third annular groove is in an isosceles trapezoid shape; the lower annular bulge is inserted into the third annular groove and is matched with the third annular groove;
the upper end surface of the middle filler group is abutted against the lower end surface of the first annular bulge, and the lower end surface of the middle filler group is abutted against the upper end surface of the second annular bulge;
the upper end surface of the lower packing group is abutted against the lower end surface of the second annular protrusion, and the lower end surface of the lower packing group is abutted against the bottom surface of the packing cavity; the structural composition of the lower packing group is completely the same as that of the upper packing group.
2. A valve as claimed in claim 1, wherein the length of the connecting block increases as the distance from the central axis of the valve stem decreases; the length of the connecting piece is L1, and the length of the connecting piece gradually increases from top to bottom along the central axis direction of the valve rod.
3. A valve as claimed in claim 1, wherein the first groove section subtends an angle at the centre which is equal to the angle at which the first projection section subtends an angle which is greater than 180 °.
4. A valve according to claim 1, wherein a sealing gasket is provided between the lower end face of the stuffing box and the bottom of the stuffing chamber.
5. The valve according to claim 1, wherein the first annular inclined surface, the second upper annular inclined surface, the second lower annular inclined surface and the third annular inclined surface are parallel to each other, and the included angle between the first annular inclined surface and the horizontal plane is 5-30 degrees; the included angle between the second upper annular inclined plane and the horizontal plane is 5-30 degrees; the included angle between the second lower annular inclined plane and the horizontal plane is 5-30 degrees; the included angle between the third annular inclined plane and the horizontal plane is 5-30 degrees.
6. The valve of claim 1, wherein the middle packing group is a graphite asbestos cord; and an O-shaped sealing ring is arranged in each annular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811486210.0A CN109555898B (en) | 2018-12-06 | 2018-12-06 | Valve gate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811486210.0A CN109555898B (en) | 2018-12-06 | 2018-12-06 | Valve gate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109555898A CN109555898A (en) | 2019-04-02 |
| CN109555898B true CN109555898B (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811486210.0A Active CN109555898B (en) | 2018-12-06 | 2018-12-06 | Valve gate |
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| Country | Link |
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| CN (1) | CN109555898B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340388B (en) * | 2018-12-06 | 2021-03-26 | 建湖县坤腾机械有限公司 | Valve rod |
| CN113605856A (en) * | 2021-08-11 | 2021-11-05 | 江苏宏泰石化机械有限公司 | Fracturing gas production wellhead valve with self-sealing structure |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5056757A (en) * | 1990-10-12 | 1991-10-15 | Fisher Controls International, Inc. | Packing containment for live loaded fugitive emission seals |
| US5593166A (en) * | 1994-03-02 | 1997-01-14 | Fisher Controls International, Inc. | Low friction packing |
| EP2372204A1 (en) * | 2010-03-17 | 2011-10-05 | Tyco Valves & Controls Italia S.r.L. | Seal system for high-pressure fluid shut-off valves |
| CN102947633A (en) * | 2010-05-11 | 2013-02-27 | 费希尔控制国际公司 | Valve stem having conditioned lubricating surfaces |
| CN203115278U (en) * | 2013-04-02 | 2013-08-07 | 浙江贝尔控制阀门有限公司 | Metal ring sealing stuffing box |
| CN204312852U (en) * | 2014-12-15 | 2015-05-06 | 河南盛誉实业有限公司 | A kind of pneumatic discharging valve |
| CN204372315U (en) * | 2014-10-30 | 2015-06-03 | 重庆山能仪表有限公司 | Corrosion resistant type packing seal structure |
| CN205689885U (en) * | 2016-06-17 | 2016-11-16 | 特技阀门集团有限公司 | Ball valve is filled in one |
-
2018
- 2018-12-06 CN CN201811486210.0A patent/CN109555898B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5056757A (en) * | 1990-10-12 | 1991-10-15 | Fisher Controls International, Inc. | Packing containment for live loaded fugitive emission seals |
| US5593166A (en) * | 1994-03-02 | 1997-01-14 | Fisher Controls International, Inc. | Low friction packing |
| EP2372204A1 (en) * | 2010-03-17 | 2011-10-05 | Tyco Valves & Controls Italia S.r.L. | Seal system for high-pressure fluid shut-off valves |
| CN102947633A (en) * | 2010-05-11 | 2013-02-27 | 费希尔控制国际公司 | Valve stem having conditioned lubricating surfaces |
| CN203115278U (en) * | 2013-04-02 | 2013-08-07 | 浙江贝尔控制阀门有限公司 | Metal ring sealing stuffing box |
| CN204372315U (en) * | 2014-10-30 | 2015-06-03 | 重庆山能仪表有限公司 | Corrosion resistant type packing seal structure |
| CN204312852U (en) * | 2014-12-15 | 2015-05-06 | 河南盛誉实业有限公司 | A kind of pneumatic discharging valve |
| CN205689885U (en) * | 2016-06-17 | 2016-11-16 | 特技阀门集团有限公司 | Ball valve is filled in one |
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| Publication number | Publication date |
|---|---|
| CN109555898A (en) | 2019-04-02 |
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