CN100552273C

CN100552273C - Valve with isolation seal driving opening, close device

Info

Publication number: CN100552273C
Application number: CNB2006100206495A
Authority: CN
Inventors: 林德宽
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-04-03
Filing date: 2006-04-03
Publication date: 2009-10-21
Anticipated expiration: 2026-04-03
Also published as: CN101050827A

Abstract

This invention belongs to valve is supporting and opens and closes device with isolating seal, comprise the housing that is provided with the aperture indicator panel, the harmonic drive of band pliable pressure bearing, the isolation sealing component that comprises screw rod seal closure and flexible shell, screw rod and with the nut sleeve of a pair of eccentric rigidity bearing or flexible bearing, screw rod cover, base and pressure balance chamber, be provided with the valve gap of intercommunicating pore, gland, sheath, Sealing and handwheel.The present invention have the flexible isolating driving mechanism and production technology simple, install, easy to adjust, operate steadily, reliably, the inside and outside cavity pressure autobalance of flexible shell is good, hazardous medium is difficult for entering inner chamber; Characteristics such as it is convenient that valve opening is regulated precise control, and working life is long.Overcome background technique and adopted flexible internal tooth required precision height, difficulty of processing big, installed and regulate difficulty, apical tooth easily takes place in operation, stationarity is poor, and the inside and outside cavity pressure regulatory function of flexible shell is poor, and Korrosionsmedium easily enters disadvantages such as inner chamber.

Description

Valve with isolation seal driving opening, close device

Technical field

It is supporting to the invention belongs to a kind of and valve, is used to open and the device of throttle down.Particularly a kind of device that opens and closes valve that adopts the isolating seal transmission.Especially be fit to such as using in nuclear industry department and the delivery line that allows hazardous medium to leak etc. anything but.

Background technique

Conventional valve is owing to its reasons in structure, and the active sealing problem of intractable has fed sheet of a media inevitably and leaks, causes waste very to cause befouling environment.The conveying of poisonous for some, harmful material, the valve of using such as nuclear industry etc. adopt bellows that valve stem part is carried out motive sealing owing to allow to leak anything but usually.Though adopt sylphon seal can prevent effectively that medium from leaking, but because sealing bellows itself exists structure and manufacturing process complexity, device volume keying stroke big, gate valve is long and can not carry out transmission of power, volume is many greatly than the same specification valve, manufacture difficulty is big, bear in the use pressure low, be subjected to influence of temperature change big; In addition, because bellows directly contacts with carrying liquid, easily be corroded again, particularly sylphon seal can not be used for the valve such as rotary opening and closings such as butterfly valve, ball valves, and application area is subjected to very big restriction.In notification number is the patent documentation of CN2725674, disclose a kind of denomination of invention at above-mentioned defective claimant and comprised housing for " a kind of valve opening and closing device that adopts the isolating seal transmission " this device, harmonic drive with symmetrical pressure bearing group, by the flexible gear and the isolating seal transmitting assemblies that last screw rod seal closure is formed of band internal tooth and be located at screw rod that bottom in it is a valve rod, with the nut sleeve of a pair of eccentricity gear, gland, handwheel, base and seal ring.Though it is little that this device has a volume, but prevent that effectively being transferred medium leaks, the compressive strength height, be subjected to that influence of temperature change is little, security of operation and can being fit to and the supporting use of manual, the electronic high, medium and low pressure valve of multiclass, realize not having the characteristics such as regulating control of leaking.But because the pressure bearing in the harmonic drive is the rigidity bearing, the set upper and lower eccentric wheel of nut sleeve is a gear, therefore the gear teeth meshing that must be provided with in flexible shell on flexible internal tooth and the upper and lower eccentric wheel could realize transmission of power, and flexible internal tooth processing difficulties, aligning accuracy requires high, and the apical tooth phenomenon easily takes place during work; In addition, the cavity volume of its flexible shell can not be regulated, sealing transmitting assemblies inner chamber will change at its volume of the upper and lower Cheng Zhongxin of moving past of screw rod, variation of temperature also will cause that gas or the filling liquid volume in the chamber changes, these variations will cause inside and outside cavity pressure unbalance, form pressure difference, become negative pressure to screw rod is capable, also corrosive gas, liquid may be sucked in the nut sleeve corrosion screw rod etc. simultaneously.Thereby exist internal tooth required precision height, difficulty of processing big, install regulate difficulty, stationarity in service is poor, easily produce the apical tooth phenomenon, and flexible shell chamber pressure regulatory function is poor, fed sheet of a media easily enters disadvantages such as nut sleeve internal corrosion screw rod.

Summary of the invention

The objective of the invention is to disadvantage at the background technique existence, improve a kind of valve of design with isolation seal driving opening, close device, simplify flexible drive mechanism and production technology to reach, regulate the pressure of flexible shell inner chamber automatically, guarantee inside and outside cavity pressure balance; And install easy to adjustly, and work operates steadily, and purpose such as increase the service life.

Solution of the present invention is to change symmetrical pressure bearing group into flexible bearing by the rigidity bearing pack on basis of background technology, also change set a pair of eccentricity gear on the nut sleeve outer cylinder into rigidity bearing or flexible bearing, the flexible internal tooth of the ring-type that cooperates with above-mentioned two eccentricity gears in the flexible shell is located in cancellation simultaneously; Between base and axle sleeve bottom, set up the circular pressure counter balance pocket of a band piston, the pressure in inside and outside chamber when working with balance; The present invention promptly realizes its goal of the invention with this.Therefore, the present invention includes the harmonic drive of housing, band pressure bearing, isolation sealing component and be located at screw rod in it, nut, screw rod cover assembly, handwheel, gland, base, seal ring; Key is that the pressure bearing in the harmonic drive is the pliable pressure bearing that ring-type is provided with, isolation sealing component comprises screw rod seal closure and flexible shell, in it corresponding to nut sleeve outer cylinder of pliable pressure bearing be a pair of upper and lower superimposed and about 180 ° shift to install and respectively with the eccentric circle cylinder of rigidity bearing or the elliptic cylinder of band flexible bearing; Pliable pressure bearing in the harmonic drive is by half clad type or contact connections with the full clad type pressure of flexible bearing on it respectively of a pair of rigidity bearing that shifts to install on flexible shell and the nut sleeve, with transmission benefit power.

Pressure during for the work of the inside and outside chamber of balance flexible shell well also prevents that the corrosivity fed sheet of a media from entering inner chamber along the screw rod bottom, between screw rod cover and base, establish the annular pressure counter balance pocket of a band piston, simultaneously offer intercommunicating pore corresponding to upper pressure counter balance pocket place, and between its underpart screw rod cover and screw rod, seal ring is set, one group of intercommunicating pore is set at the valve gap top at the screw rod cover.In order to reduce the service behaviour of difficulty of processing and raising nut sleeve, integrated type nut, screw rod cover assembly are changed into combined type and adopt copper nut sleeve, be connected into one by pin between nut sleeve and the screw rod cover.And described nut sleeve outer cylinder corresponding to the pliable pressure bearing, when for a pair of eccentric circle cylinder that shifts to install, its offset is 0.9～2mm; When being elliptic cylinder, the distance between the bifocal then is 1.8～5mm.Open amount for the ease of control and observation spool, on housing, also be provided with a valve opening indicator panel, the needle pivot on this indicator panel by gear pair, gear shaft and on worm gear be located at the worm meshing on the harmonic drive housing and make pointer with its rotation synchronization motion.In order to prevent that the screw rod seal closure is subjected to external force to influence distortion, damage, and also is provided with a sheath outside seal closure.

The present invention because with symmetrically arranged rigidity pressure bearing group in the harmonic drive in the background technique, change the flexible bearing that annular is provided with into, and, cancel corresponding internal tooth on the flexible shell simultaneously with a pair of eccentricity gear corresponding with it on the nut sleeve, the rigidity bearing that is re-established as a pair of eccentric setting or the concentric oval flexible bearing that is provided with.Pressure flexible axle sheet is by flexible shell half coating or coat the bearing transmission entirely, its velocity ratio is 1; Thereby overcome flexible internal tooth difficulty of processing big, install regulate difficulty, traveling comfort is poor, easy defective such as apical tooth.The setting of pressure balance chamber can be regulated the pressure in the inside and outside chamber of sealing transmitting assemblies again automatically, prevents that aggressive medium from entering inner chamber; The setting of valve opening indicator panel (mechanism) is convenient to observe the open amount with effective control valve again.Thereby have the flexible isolating driving mechanism and production technology simple, install, easy to adjust, it is reliable to operate steadily, the inside and outside cavity pressure autobalance of flexible shell is good, hazardous medium is difficult for entering inner chamber; Characteristics such as valve opening is regulated precise control, convenience, and working life is long.

Description of drawings

Fig. 1. be by structural representation of the present invention (embodiment's 1. schematic representation);

Fig. 2. be the A-A view;

Fig. 3. be the B-B view;

Fig. 4. embodiment 2. is when flexible shell is inside and outside when all adopting flexible bearing, its nut sleeve, inside and outside flexible bearing, flexible shell structure and correlation schematic representation;

Fig. 5. be the C-C view.

Among the figure: 1, housing, 2, harmonic drive, 2-1, worm screw (Z ₁), 2-2, pressure flexible bearing, 3-1, flexible shell, 3-2, last screw rod seal closure, 3-3, upper ring cap, 3-4, following ring set, 3-5 and 5,6,9～3,12-2,14-2: seal ring, 7, sheath, 8, handwheel, 9, indicator panel, 9-1, pointer, 9-2, needle pivot, 9-4, gear shaft, 9-5, worm gear (Z ₂), 9-6 and 9-7: gear (Z ₁And Z ₂), 10, nut sleeve, 10-1, go up capacity eccentric bearing, 10-2, following capacity eccentric bearing, 10-3, flexible bearing, 11, pin, 12, screw rod cover, 12-1, intercommunicating pore, 13, base, 14, pressure balance chamber, 14-1, piston, 14-2, piston ring, 15, bolt, 16, valve gap, 16-1, intercommunicating pore, 17, screw rod.

Embodiment

Embodiment 1: present embodiment is an example to open and close device with the supporting usefulness of the gate valve of DN200, working pressure 2.5MPa:

Nut sleeve 10 materials are ZCuAl9Mn2, long 160mm, main body external diameter φ 52mm, internal thread is Tr32X6LH-7H, the cylndrical surface diameter that cooperates with upper and lower capacity eccentric bearing 10-1,10-2 is φ 60mm, and offset is 1.57mm respectively, and height is 13.2mm, the bottom cooperates minister 62.0mm with screw rod cover 12, and symmetry is offered 2 φ 10mm column pin holes on it; Bearing 10-1,10-2 model are 61912; Screw rod overlaps 12 length overall 189mm, top external diameter φ 70mm, long 102mm, bottom internal diameter φ 34mm and base 13, pressure balance chamber 14 cooperation place external diameter φ 50mm, long 67mm, body fixed tray diameter phi 131mm; The long 265mm of screw rod 17 helical thread portions, the long 250mm of bottom polished rod, diameter phi 34mm.Base 13 high 70mm, external diameter φ 225mm, upper and lower groove diameter is respectively φ 150mm and φ 126mm, groove depth is respectively 13mm and 47mm, lower recess external diameter 150mm; The inside and outside footpath of piston 14-1 is respectively φ 50mm and φ 126mm, axial thick 22mm, and outer, the internal diameter of inside and outside seal groove is respectively φ 59mm and 117mm, axially height is 7mm.Flexible shell 3-1 height overall 216mm, cooperation place internal diameter φ 87mm, high 40mm such as middle part and flexible bearing 2-2, its 2.5 ° of top cylindrical shell tapering, 5.0 ° of bottom cylindrical shell taperings, wall thickness 1.5mm, material are 40CrNiMoA, the axial high 27mm of following ring set 3-4, external diameter 150mm, with nut sleeve fixed tray cooperation place internal diameter φ 131mm, with flexible shell 3-1 infraoral connection place diameter phi 106.5mm; Seal closure 3-2, height overall 270mm, internal diameter φ 34mm, wall thickness 4mm, the high 48mm of ring set 3-3, with flexible shell 3-1 cooperation place external diameter φ 81mm, flexible shell 3-1 and upper and lower ring set 3-3,3-4 strike up partnership by plasma seal weld.Harmonic drive 2 high 221mm, inside and outside footpath, top is respectively φ 42mm and φ 70mm; Inside and outside footpath, bottom is respectively φ 110mm and φ 140mm, the worm screw 2-1 (Z on it ₁) number, axial plane modulus and addendum coefficient be 1,20 ° of tooth-shape angles, screw axis are to high 16mm, 0.414 ° of lift angle, dextrorotation, outside diameter circle φ 134.2mm, the annular groove of inner chamber bottom and pressure flexible bearing 2-2 cooperation place is oval annular groove, axial high 18.2mm, minor axis radius R59mm, bifocal is apart from 3.14mm, and pressure flexible bearing 2-2 model is 3E818KAT2.Housing 1, high 240mm, be respectively φ 150mm and φ 225mm with the inside and outside footpath of following ring set 3-4 and base 13 cooperation places, the inside and outside footpath of top and harmonic drive 2 and gland 4 cooperation places is respectively φ 140mm and φ 185mm, main body wall thickness 8mm, its 9-4 mounting hole diameter phi 16mm that cogs, dark 124mm; Indicator panel 9 diameter phi 100mm, gear 9-7 (Z ₄) tip diameter φ 72mm, gear shaft 9-4 diameter phi 8mm, long 130mm; Worm gear 9-5 (Z on it ₂) normal module and addendum coefficient are 1, the number of teeth 12 teeth, 20 ° at flute profile angle, 0.434 ° of helix angle, dextrorotation, gear 9-6 (Z ₃) modulus and addendum coefficient also be 1,20 ° at flute profile angle, totally 12 teeth.Sheath 7 high 138mm, internal diameter φ 46mm, lower end connect with the upper end of humorous wave generating device 2 is fastening by M60 * 1.5 internal threads; Handwheel 8 external diameter φ 400mm, center hole φ 62mm connect with harmonic drive 2 and by sheath 7 axial restraints by flat key.All seal rings of this example all adopt O type butyronitrile rubber seal ring.

Present embodiment by clamping bolt 15 with housing 1, base 13 and valve gap 16, be tightened on one, the valve gap intercommunicating pore 16-1 that symmetry is established 4 φ 5mm; The screw rod bottom connects with spool.When handwheel 8 rotates, drive harmonic drive 2 and on pressure flexible bearing 2-2 rotate, and drive capacity eccentric bearing 10-1,10-2 and nut sleeve is rotated synchronously, and then drive spools by screw rod 17 and open or close across flexible shell 3-1.

Embodiment 2: it is example that present embodiment adopts flexible bearing with nut sleeve 10 outer cylinders, its oval outer cylinder minor axis radius R34mm, and the bifocal distance is 3.14mm, axial high 29mm also; Adopting a pair of each bearing nominal force distance in order to ensure transmission of torque, present embodiment is 3E814KAT2 type flexible bearing for the model of 250Nm.All the other are all identical with embodiment 1..

Claims

1, a kind of valve with isolation seal driving opening, close device, comprise housing, the harmonic drive of band pressure bearing, isolation sealing component and be located at screw rod in it, nut, screw rod cover assembly, handwheel, gland, base, seal ring; It is characterized in that the pressure bearing in the harmonic drive is the flexible bearing that ring-type is provided with, isolation sealing component comprises screw rod seal closure and flexible shell, in the flexible shell corresponding to the nut sleeve outer cylinder of pliable pressure bearing be a pair of upper and lower superimposed and about 180 ° shift to install respectively with the eccentric circle cylinder of rigidity bearing or the elliptic cylinder of band flexible bearing; Pliable pressure bearing in the harmonic drive is by half clad type or contact connection with the full clad type pressure of flexible bearing on it respectively of a pair of rigidity bearing that shifts to install on flexible shell and the nut sleeve, with transferring power.

2, by the described valve of claim 1. with isolation seal driving opening, close device; It is characterized in that between screw rod cover and base, being provided with the annular pressure counter balance pocket of a band piston, offer one group of intercommunicating pore and between described screw rod cover bottom and screw rod, seal ring is set corresponding to this place, pressure balance chamber top at the screw rod cover simultaneously, offer one group of through hole over against pressure balance chamber cavity position at the valve gap top.

3, by the described valve of claim 1. with isolation seal driving opening, close device; It is characterized in that nut, screw rod cover assembly be combined type and, adopt copper nut sleeve, nut sleeve is connected into one by pin between overlapping with screw rod.

4, by the described valve of claim 1. with isolation seal driving opening, close device; It is characterized in that described nut sleeve outer cylinder, when for a pair of eccentric circle cylinder that shifts to install, its offset is 0.9～2mm; When being elliptic cylinder, the distance between the bifocal then is 1.8～5mm.

5, by the described valve of claim 1. with isolation seal driving opening, close device; It is characterized in that on housing, also being provided with a valve opening indicator panel, the pointer on this indicator panel by gear pair, gear shaft and on worm gear and the worm meshing of being located on the harmonic drive housing, and make pointer with its rotation synchronization motion.

6, by the described valve of claim 1. with isolation seal driving opening, close device; It is characterized in that outside last screw rod seal closure, also being provided with a sheath.