CN201284835Y

CN201284835Y - Double-valve core balancing type large diameter supercritical parameter break valve

Info

Publication number: CN201284835Y
Application number: CNU200820161875XU
Authority: CN
Inventors: 张建华; 王芳; 尤广泉; 何伯芹
Original assignee: NANTONG POWER STATION VALVE CO Ltd
Current assignee: NANTONG POWER STATION VALVE CO Ltd
Priority date: 2008-10-23
Filing date: 2008-10-23
Publication date: 2009-08-05
Anticipated expiration: 2018-10-23

Abstract

The utility model discloses a double valve core balanced large-diameter supercritical parameter stop valve, belonging to the field of valve, which comprises a valve rod, a lifting mechanism, a valve cover subassembly and a hollow valve body. The valve cover subassembly is sealed at an upper port of the hollow part of the valve body; an inlet and an outlet are arranged at two sides of the valve body; a main valve seat and a main valve core matching with each other are arranged in the hollow part of the valve body; the valve rod threads through the valve cover subassembly in an airtight mode and is in transmission connection with the lifting mechanism; a valve core cover is axially connected at the upper part of the main valve core through screw threads; a symmetric jacket is matched and arranged in the valve core cover, and an auxiliary valve core is arranged in the symmetric jacket; the valve rod threads through the valve core cover, with the lower end rotatably connected with the circumference of the symmetric jacket; the hollow part of the main valve core is communicated with the outlet and the inlet through a centre hole and a circumferential hole; an auxiliary valve seat and the auxiliary valve core are arranged at the upper port of the centre hole; and the auxiliary valve core is installed in the symmetric jacket. The stop valve is easy and labor saving to open and close, convenient to fabricate and low in cost and is applicable in harsh work occasions with high temperature, high pressure and supercritical parameters.

Description

Double spool balanced type heavy caliber supercritical parameter stop valve

Technical field

The utility model relates to a kind of valve, particularly a kind of stop valve.

Technical background

Stop valve of the prior art, mainly include elevator mechanism, valve gap assembly and hollow valve body, the valve gap assembly is sealed in the suitable for reading of valve body hollow space, the valve body both sides are respectively equipped with the import and the outlet of connecting the valve body hollow space, be provided with the main valve seat and the main valve plug that cooperatively interact in the valve body, when main valve plug fell into main valve seat, described import and outlet were cut off; When main valve plug broke away from main valve seat, import and outlet were connected; Main valve plug is installed on the valve rod, and valve stem seal passes the valve gap assembly and described elevator mechanism is in transmission connection.During its work, rise or descend, make the main valve plug disengaging or fall into main valve seat, reach the purpose of opening and closing stop valve by elevator mechanism pulling main valve plug.Its deficiency is: the main valve plug of existing stop valve has only one, when the pressure reduction between import and the outlet is big, resistance during its opening and closing is bigger, and especially for the heavy caliber stop valve, its Blowdown of a safety valve is big, unbalanced force is big, cause opening difficulty, for the electric opening and the stop valve of closing, big especially because of opening and closing moment, necessary expanded motor power rises the complete machine cost.These problems have limited the application of stop valve in the high-pressure large-caliber field.

The model utility content

The utility model proposes a kind of design proposal of double spool balanced type heavy caliber supercritical parameter stop valve, make it be applicable to harsh occasions such as High Temperature High Pressure, have easily manufacturedly, sealing is reliable, open and close easily laborsaving, degradation advantage under the cost.

For achieving the above object, the technical solution of the utility model is as follows: double spool balanced type heavy caliber supercritical parameter stop valve, comprise valve rod, elevator mechanism, valve gap assembly and hollow valve body, the valve gap assembly is sealed in the suitable for reading of valve body hollow space, and the valve body both sides are respectively equipped with the import and the outlet of connecting the valve body hollow space, are provided with the main valve seat and the main valve plug that cooperatively interact in the valve body hollow space, when main valve plug fell into main valve seat, described import and outlet were cut off; When main valve plug broke away from main valve seat, import and outlet were connected; Described valve stem seal passes the valve gap assembly and described elevator mechanism is in transmission connection, the described main valve plug upper axial cartridge cover that has been threaded, cooperate in the cartridge cover and be provided with chuck, to being provided with auxiliary valve core in the chuck, valve rod passes cartridge cover, the valve rod lower end with chuck circumferentially is connected rotationally, main valve plug hollow, upwards be provided with center hole on the lower end surface of main valve plug and connect the hollow space of main valve plug, the main valve plug periphery is provided with the hollow space that main valve plug is connected in some circumferential holes, the connection part of the hollow space of described center hole and main valve plug is provided with auxiliary-seat, auxiliary-seat is corresponding with auxiliary valve core, and valve rod can spur auxiliary valve core along moving up and down in the space of cartridge cover and the formation of main valve plug hollow space.

When the utility model is in closed condition, main valve plug falls into main valve seat, auxiliary valve core falls in the auxiliary-seat, and import and outlet are blocked, when needs open valve, elevator mechanism at first through valve rod, chuck driven auxiliary valve core rise, auxiliary valve core and auxiliary-seat are separated, and the medium of import can reach outlet by circumferential hole, center hole, but this moment, flow area is little, and flow is also smaller; Continue poppet stem, when conflicting at the cartridge cover inner top to the chuck upper end, can drive main valve plug and rise, main valve plug and main valve seat are broken away from, a large amount of media is from flowing to outlet between main valve plug and the main valve seat; When the needs throttle down, its course of action in contrast, main valve plug is taken a seat earlier, takes a seat behind the auxiliary valve core.From said process as can be seen, the keying of auxiliary valve core is stressed less, in opening and closing the main valve plug process, by auxiliary valve core the pressure reduction between import and the outlet is decreased, and makes when main valve plug opens and closes stressed less.Compared with prior art, the utility model opens and closes easily laborsaving, can reduce under the cost of electric driving mechanism; It has easily manufactured, and the reliable sealing advantage can be made into bigbore valve.This device is suitable for the harsh workplace of High Temperature High Pressure supercritical parameter, as is used for the steam power plant complete auxiliaries, also can be used in the general machinery equipment field.

For ease of making and installing, described is the subdivision structure to chuck, the chuck center is provided with shoulder hole, the aperture is little up and down for described shoulder hole, middle aperture is big, is equipped with circumferential boss on valve rod lower end and the auxiliary valve core, and described circumferential boss snaps in the big footpath section of shoulder hole, stretch out from the end opening of shoulder hole the auxiliary valve core lower end, and stretch out from the suitable for reading of shoulder hole the upper end of valve rod.To make the subdivision structure to chuck, its assembling with valve rod, auxiliary valve core is very simple and convenient.

Description of drawings

Fig. 1 is the utility model structural representation.

Fig. 2 is the partial enlarged drawing of A among Fig. 1.

Fig. 3 is to jacket structured schematic representation.

Fig. 4 is the plan view to chuck shown in Figure 3.

Wherein 1 outlet, 2 main valve seats, 3 main valve plugs, 4 circumferential holes, 5 auxiliary valve cores, 6 pairs of chucks, 7 cartridge cover, 8 valve bodies, 9 valve gap assemblies, 10 valve rods, 11 elevator mechanisms, 12 imports, 13 center holes, 14 auxiliary-seats.

Embodiment

As figure, be double spool balanced type heavy caliber supercritical parameter stop valve, comprise valve rod 10, elevator mechanism 11, valve gap assembly 9 and hollow valve body 8, valve gap assembly 9 is sealed in the suitable for reading of valve body hollow space, valve body 8 both sides are respectively equipped with the import 12 and the outlet 1 of connecting the valve body hollow space, be provided with the main valve seat 2 and the main valve plug 3 that cooperatively interact in the valve body hollow space, the position that main valve seat and main valve plug combine is made by Hardmetal materials, when main valve plug 3 fell into main valve seat 2, import 12 and outlet 1 were cut off; When main valve plug 3 broke away from main valve seat 2, import 12 and outlet 1 were connected; Valve rod 10 hermetically passing valve gap assemblies 9 are in transmission connection with elevator mechanism 11, and driving mechanism 11 can drive its lifting with handwheel, also can be electric lifting mechanism; The main valve plug 3 upper axial cartridge cover 7 that has been threaded, cooperate in the cartridge cover 7 and be provided with chuck 6, to being provided with auxiliary valve core 5 in the chuck 6, valve rod 10 passes cartridge cover 7, valve rod 10 lower ends with chuck 6 circumferentially is connected rotationally, and in axial both position relative fixed, main valve plug 3 hollows, upwards be provided with center hole 13 on the lower end surface of main valve plug 3 and connect the hollow space of main valve plug 3, periphery is provided with the hollow space that main valve plug 3 is connected in some circumferential holes 4 on the main valve plug 3, center hole 13 is provided with auxiliary-seat 14 with the connection part of the hollow space of main valve plug 3, auxiliary-seat 14 is corresponding with auxiliary valve core 5, its binding site also is to be made by Hardmetal materials, and valve rod 10 can spur auxiliary valve core 5 along moving up and down in the space of cartridge cover 7 and the formation of main valve plug 3 hollow spaces; To chuck 6 is the subdivision structure, chuck 6 centers are provided with shoulder hole, the aperture is little up and down for shoulder hole, middle aperture is big, be equipped with circumferential boss on valve rod 10 lower ends and the auxiliary valve core 5, circumferentially boss snaps in the big footpath section of shoulder hole, and stretch out from the end opening of shoulder hole auxiliary valve core 5 lower ends, and stretch out from the suitable for reading of shoulder hole the upper end of valve rod 10.

When this device was opened, by elevator mechanism 11 poppet stem 10 upwards, auxiliary valve core 5 action was earlier opened, and flowing medium is from import 12, circumferentially hole 4, center hole 13 flow to outlet 1, and its flow is less; Open main valve plug 3 then, a large amount of flowing mediums is from import 12, main valve seat 2, flow direction outlet 1, and its flow is big; When closing, the elevator mechanism actuate valve stem descends, and first main valve plug 3 puts in place, closes auxiliary valve core 5 again; In the above-mentioned working procedure,, greatly reduce and open instantaneous import 12 and export High Pressure Difference between 1, make and open instantaneous required operational torque and reduce greatly, thereby realize the easy manipulation of valve by in advance opening of auxiliary valve core 5; Equally, when closing, because after main valve plug 3 puts in place, auxiliary valve core 5 has partial journey poor, makes that closing instantaneous pressure reduction descends greatly, closes instantaneous " water hammer " impact that may form thereby reduced, maintenance system stability effectively prolongs working life of valve.

Claims

1, double spool balanced type heavy caliber supercritical parameter stop valve, comprise valve rod, elevator mechanism, valve gap assembly and hollow valve body, the valve gap assembly is sealed in the suitable for reading of valve body hollow space, the valve body both sides are respectively equipped with the import and the outlet of connecting the valve body hollow space, be provided with the main valve seat and the main valve plug that cooperatively interact in the valve body hollow space, when main valve plug fell into main valve seat, described import and outlet were cut off; When main valve plug broke away from main valve seat, import and outlet were connected; Described valve stem seal passes the valve gap assembly and described elevator mechanism is in transmission connection, it is characterized in that: the described main valve plug upper axial cartridge cover that has been threaded, cooperate in the cartridge cover and be provided with chuck, to being provided with auxiliary valve core in the chuck, valve rod passes cartridge cover, the valve rod lower end with chuck circumferentially is connected rotationally, main valve plug hollow, upwards be provided with center hole on the lower end surface of main valve plug and connect the hollow space of main valve plug, the main valve plug periphery is provided with the hollow space that main valve plug is connected in some circumferential holes, the connection part of the hollow space of described center hole and main valve plug is provided with auxiliary-seat, auxiliary-seat is corresponding with auxiliary valve core, and valve rod can spur auxiliary valve core along moving up and down in the space of cartridge cover and the formation of main valve plug hollow space.

2, double spool balanced type heavy caliber supercritical parameter stop valve according to claim 1, it is characterized in that: described is the subdivision structure to chuck, the chuck center is provided with shoulder hole, the aperture is little up and down for described shoulder hole, middle aperture is big, is equipped with circumferential boss on valve rod lower end and the auxiliary valve core, and described circumferential boss snaps in the big footpath section of shoulder hole, stretch out from the end opening of shoulder hole the auxiliary valve core lower end, and stretch out from the suitable for reading of shoulder hole the upper end of valve rod.