CN2725674Y

CN2725674Y - Valve open-close device using isolated sealed driving

Info

Publication number: CN2725674Y
Application number: CN 200420061231
Authority: CN
Inventors: 林德宽
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-09-14
Filing date: 2004-09-14
Publication date: 2005-09-14
Anticipated expiration: 2014-09-14

Abstract

The utility model relates to a valve opening and closing device which adopts isolated sealed transmission. The utility model comprises a casing, a harmonic transmission device which is provided with symmetrical pressure bearing groups, an isolated sealed transmission component which is composed of a flexible gear assembly and a sealed cover of an upper screw rod, a screw rod, a nut sleeve which is provided with a pair of eccentric gears, a pressing cap, a hand wheel, a base and a sealing ring, wherein the screw rod and the nut sleeve are arranged in the isolated sealed transmission component. The valve opening and closing device has the advantage of small volume, and can effectively prevent a medium which is conveyed from leaking outwards; the structure of the flexible gear assembly is simple and reliable. The utility model is especially suitable for being used as an opening and closing device which is matched with various manual and electric valves with high pressure, middle pressure and low pressure, which are parallelly opened and closed to realize the characteristics of complete adjusting control without leakage, etc. The utility model overcomes the disadvantages of complicated structure and manufacturing technology, large volume, large influence of temperature variation, pressure difference resistance without carrying out power transfer, narrow application range, etc. because a corrugated pipe is used for isolation and seal in the background art.

Description

A kind of valve opening and closing device that adopts the isolating seal transmission

Technical field

That the utility model belongs to is matching used with valve, be used to open and the device of throttle down; Particularly a kind of device that adopts the opening/shutting valve of isolating seal transmission.Especially be suitable for such as nuclear industry department and allow anything but using as the start-stop device of valve in the delivery line that hazardous medium leaks.

Background technique

Routine is used for valve body, spool supporting forming the start-stop device of all kinds of valves, screw rod that comprise housing, connects (valve rod) and nut sleeve with spool, and handwheel prevents stuffing box packing and the gland thereof of medium from leaking between screw rod and the housing.Fed sheet of a media can take place and leak, causes waste even environmental pollution owing to adopt material filling type sealing (static seal) in this type of start-stop device inevitably in the work; Thereby this class valve can not be as adjusting control valve harmful, the toxic substance conveyance conduit.Leaking of, hazardous medium poisonous in order effectively to prevent often adopts bellows that valve stem part is carried out isolating seal in Ministry of Nuclear Industry's gate open.Though adopt sylphon seal can prevent effectively that medium from leaking, structure and manufacturing process complexity, device volume are big, to bear pressure low and can not carry out transmission of power because sealing bellows itself exists, and temperature variation is big to its influence; The lower end is welded on the screw rod and the upper end is welded on housing or the gland during installation, the screw rod that connects with spool during work can not move relative to isolation seal, in order to guarantee that distance, bellows seal that valve rod moves need defectives such as very long, application area is subjected to greatly restriction and fails to be extensive use of.

Summary of the invention

The purpose of this utility model is a kind of valve opening and closing device that adopts the isolating seal transmission of design, and medium leaks and the antipollution while to reach avoiding being transferred, and structure and the production technology of simplifying the isolating seal parts also make it can isolate transmission; Reduced volume effectively improves compressive strength and to adaptability, the reliability of big temperature difference operating conditions, enlarges purposes such as application area.

Solution of the present utility model is according to the Harmonic Gears principle, flexible gear assembly (flexbile gear assembly) is fixing, harmonic drive (also claiming harmonic generator) places outside the flexbile gear, when this device rotates, force the controlled resiliently deformable of flexbile gear generation under external force (as handwheel) effect, make the tooth of flexbile gear and the rigidity gear train on the nut sleeve outer cylinder mesh and drive upper and lower mobile, the opening and closing of spool that screw rod and lower end thereof were rotated and then driven to nut sleeve with the realization spool; In addition, the flexbile gear assembly is isolated nut sleeve and screw rod thereof and all the other external members together with screw rod seal closure on the fastening all-in-one-piece with it, being transferred medium and just must not leaking in the pipeline by screw rod and nut sleeve, thus realize its purpose.Therefore, the utility model comprises housing, screw rod that connects with spool and nut sleeve, isolation seal, gland, handwheel, seal ring and base, key is also to be provided with the harmonic drive with symmetrical pressure bearing group in housing, isolation seal also is provided with a pair of eccentricity gear (rigidity planetary pinion) for the sealing of last screw rod seal closure and flexible gear assembly is tightened to the isolating seal transmitting assemblies that one is formed on the nut sleeve outer cylinder; Screw rod, nut sleeve and on eccentricity gear all be located in the isolating seal transmitting assemblies, nut sleeve upper end and lower end connect with the last seat ring and the activity of base inner wall sealing of flexible gear assembly respectively, the isolating seal transmitting assemblies then is located in harmonic drive and the housing cavity of resorption and is sealed fastening with base, the harmonic drive bottom be located in the inner chamber of housing top and by gland with its sealed type activity fix, its upper end then is tightened to one with handwheel, the housing lower end seals with base and is tightened to one; The symmetrical pressure bearing group of harmonic drive by its top and the flexible shell pressure type in the flexible gear outside be movable to be connected and flexible gear is meshed with a pair of eccentricity gear periodic cycle and connect; Its eccentricity gear all is anchored on the outer cylinder of nut sleeve by cover, flat key, positioning ring and locking nut in the gear.

Above-mentioned flexible gear assembly comprises book wall type flexible shell and is located at the flexible gear at its inner chamber middle part, is divided into the upper and lower seat ring at housing two ends.And described nut sleeve outer cylinder is provided with a pair of eccentricity gear, and its degree of eccentricity equates and is 2～5mm, by cover 180 ° of settings of upper and lower superimposed and left and right dislocation (promptly the center of two gears is divided into the both sides of screw rod center line) in the gear.The harmonic drive of the symmetrical pressure bearing group of described band, its bearing number are 2 covers.For the Korrosionsmedium that effectively prevents to be transmitted enters isolating seal transmitting assemblies inner chamber, in this cavity, fill being transferred the harmless liquid of medium as insulating liquid; And, also be filled with lubricant oil in the cavity between this assembly and harmonic drive and housing in order to reduce the frictional force between flexible gear housing and the bearing.

The utility model since according to the harmonic driving principle, adopt flexbile gear fix and with screw rod, nut sleeve and on planetary pinion and external isolation transmission, thereby have volume little, can effectively prevent to be transferred medium and leak, and the flexible gear assembly structure is simple, reliable, compressive strength is high, be subjected to influence of temperature change little, security of operation, reliable; Especially be suitable as the supporting start-stop device of using of manual, electronic high, medium and low pressure valve with all kinds of parallel open and closes, realize the absolute characteristics such as regulating control of leaking of not having.

Accompanying drawing and description of drawings

Fig. 1. for the utility model structure reaches and valve body connecting relation schematic representation (B-B view);

Fig. 2. be the A-A view;

Fig. 3. be flexible gear and two eccentricity gears difference mesh schematic representation (M enlarged view).

Among the figure: 1. housing, 2. harmonic drive, 2～1. bearings, 2～2. bearing pins, 3. flexible gear assembly, 3～1. flexible gears, 3～2. flexible shells, 3～3. go up seat ring, 3～4. isolating seal transmitting assemblies inner chambers, 3～5. descend seat ring, 4. base, 5. valve body, 6. screw rod, 7,8,14,15,16: seal ring, 9. nut sleeve, 9～1 screw threads, 10. positioning ring overlaps in 11. gears, 11～1. descend eccentric wheel, 11～2. go up eccentric wheel, 11～3. flat keys, 12. back-up rings, 13. locking nut, 17. gland, 18. handwheels, 18～1. flat keys, 18～2. locking nuts, screw rod seal closure on 19..

Embodiment

Present embodiment with Flow diameter be φ 150mm, working pressure 6.4MPa, velocity ratio be 1 gate valve supporting be example with start-stop device:

Screw rod 6 is Tr32 * 6LH screw thread, length overall 600mm, the long 250mm of screw thread wherein, screw rod lower end and spool connection place are conventional T type groove, nut sleeve 9 height overall 216mm, upper and lower intracavity diameter is φ 34mm, upper and lower inner chamber height is respectively 42mm, 107mm, and the middle part also is Tr32 * 6LH screw thread, screw thread segment length 60mm, main body external diameter φ 64mm, with in the gear cover 11 cooperation place diameter phi 50mm, high 30mm, flat key groove width 10mm, with locking nut 13 cooperation places be M48 * 1.5 screw threads; Cover 11 high 30mm in the gear, center-hole diameter φ 50mm, with upper and lower gear matched place height respectively be 15mm, diameter is φ 76mm, is 3mm with the offset of center hole, its center line lays respectively on the cross section, same medial axis, centerline hole both sides; Upper and lower gear 11～2 and 11～1 tip diameter φ 91.2mm, diameter of bore φ 76mm, thick 15mm, the number of teeth are 90 teeth, modulus is 1,20 ° at flute profile angle.Flexible gear assembly 3, high 198mm, flexible gear 3～1 and above partially flexible housing 3～2 thereof are cylindrical shape, inside and outside diameter is respectively φ 109 and φ 103mm, and the bottom is cone barrel type, high 78mm, and tapering is 5 °, flexible gear 3～1 tip diameter φ 98.9mm, the number of teeth is 100 teeth, modulus is 1,20 ° at flute profile angle, last seat ring 3～3, inside and outside footpath are respectively φ 40mm and φ 60mm, following seat ring 3～5 external diameter φ 154mm, the thick 10mm of ring body, material is 40CrNiMoA; Last screw rod seal closure 19 high 180mm, internal diameter φ 34mm, wall thickness 5mm, infraoral connection place external diameter φ 40mm snaps in seat ring 3～3 interior back seal welds and strikes up partnership.Base 4 high 107mm, the part of being located in the flexible shell 3～2 is a cone, upper oral part external diameter φ 88mm, 5 ° of taperings, endoporus and nut sleeve 9 mating part diameter phi 64mm, pedestal chassis external diameter φ 222mm, thick 22mm.Housing 1 high 214mm, upper oral part external diameter 209mm, internal diameter 160mm, with the dark 138mm in harmonic drive 2 auxiliary sections, bottom internal diameter 128mm, chassis external diameter also are φ 222mm, are sealed to one with base 4 by bolton.Harmonic drive 2 high 231mm, main body external diameter φ 160mm, with flexible shell 3～2 auxiliary section internal diameter 115mm, diaxon bearing hole is 26 * 26mm square hole on it, top and gland cooperation place external diameter φ 73mm, internal diameter φ 44mm, with handwheel by flat key 18～1 and 18～2 fastening connections of locking nut, two bearings 2～1 is 45901 type needle bearings, bearing pin 2～2 long 45mm, diameter phi 12mm, gland 17 high 55mm, in the top, external diameter is respectively φ 73mm and φ 93mm, and bottom disk body and seam external diameter are respectively φ 209mm and φ 160mm, connects with housing 1 fit sealing and harmonic drive 2 is sealingly fastened in turnably in the upper chamber of housing 1 by bolt.

Present embodiment rotates when rotating handwheel 18 time-harmonic wave transmission devices 2 thereupon, drive simultaneously symmetrical bearing 2～1 on it press flexible shells 3～2 and around housing rotate, force simultaneously flexible gear 3～1 and corresponding upper and lower eccentricity gear 11～2 and 11～1 engagements in it and make nut sleeve 9 backward rotation so drive screw rod 6 upwards (or downward) mobile, when the lower end of screw rod 6 and spool are in coupled situation, can drive spool work (closure or openness).

Claims

1, a kind of valve opening and closing device that adopts the isolating seal transmission, comprise housing, screw rod that connects with spool and nut sleeve, isolation seal, gland, handwheel, seal ring and base, it is characterized in that also being provided with in housing the harmonic drive with symmetrical pressure bearing group, isolation seal also is provided with a pair of eccentricity gear for the sealing of last screw rod seal closure and flexible gear assembly is tightened to the isolating seal transmitting assemblies that one is formed on the nut sleeve outer cylinder; Screw rod, nut sleeve and on eccentricity gear all be located in the isolating seal transmitting assemblies, nut sleeve upper end and lower end connect with the last seat ring and the activity of base inner wall sealing of flexible gear assembly respectively, the isolating seal transmitting assemblies then is located in harmonic drive and the housing cavity of resorption and is sealed fastening with base, the harmonic drive bottom be located in the inner chamber of housing top and by gland with its sealed type activity fix, its upper end then is tightened to one with handwheel, the housing lower end seals with base and is tightened to one; The symmetrical pressure bearing group of harmonic drive by its top and the flexible shell pressure type in the flexible gear outside be movable to be connected and flexible gear is meshed with a pair of eccentricity gear periodic cycle and connect; Its eccentricity gear all is anchored on the outer cylinder of nut sleeve by cover, flat key, positioning ring and locking nut in the gear.

2, by the described valve opening and closing device of claim 1, it is characterized in that the flexible gear assembly comprise book wall type flexible shell and be located at its inner chamber middle part flexible gear, be divided into the upper and lower seat ring at housing two ends.

3, by the described valve opening and closing device of claim 1, it is characterized in that described a pair of eccentricity gear, its degree of eccentricity equates and is 2～5mm, by 180 ° of settings of the upper and lower superimposed and left and right dislocation of cover in the gear.

4, by the described valve opening and closing device of claim 1, it is characterized in that the harmonic driving device of the symmetrical pressure bearing group of described band, its bearing number is 2 covers.

5, by the described valve opening and closing device of claim 1, it is characterized in that also being provided with insulating liquid at the barrier assembly inner chamber; And also be filled with lubricant oil in the cavity between flexible gear housing and harmonic drive and housing.