CN201764062U

CN201764062U - Eccentric ball embedded type plastic ball valve

Info

Publication number: CN201764062U
Application number: CN201020547588XU
Authority: CN
Inventors: 谢一环; 刘福江
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-09-29
Filing date: 2010-09-29
Publication date: 2011-03-16
Anticipated expiration: 2020-09-29

Abstract

The utility model discloses an eccentric ball embedded type plastic ball valve, which is characterized in that the eccentric ball body of the valve and the valve seat can be embedded in the mold, and can directly conduct an integral cast molding. The utility model is advantageous in that the integral intensity of the valve body is higher than that of the valve body produced by the prior art; the stress of the valve body is evenly distributed, and the creep deformation due to stress concentration is reduced; the endurance of the ball valve is greatly improved; the sealing is good, the opening and closing are easy and the positioning is accurate; the process steps are reduced and the consumptive materials are saved; the plastic ball valve has obvious quality significance and economic benefit.

Description

A kind of eccentric spheroid embedded plastic ball valve

Technical field

The utility model relates to a kind of ball valve made of plastic structure, specifically is meant a kind of eccentric spheroid embedded plastic ball valve.

Background technique

Ball valve made of plastic is compared with traditional metal ball-valve, have in light weight, easily manufactured, cost is low and plurality of advantages such as corrosion-resistant, has obtained application more and more widely.

Its valve body of existing ball valve made of plastic and spheroid part all are to be formed by the direct casting of plastics.Because the needs of assembling spheroid, two or left center right were three about the used plastics valve body of engineering was divided into, and carried out sealing with locking screw.

Because the material of ball valve made of plastic is under the effect of big stress, the creep deformation that short-term deformation can take place and increase in time makes the various fitted positions of ball valve produce negative variation, influences sealing effect.And that the plastics stress at the bolt position of mechanical fastener technology is concentrated is big, more than two kinds of short-term deformation and the creep deformation that increases in time even more serious, it can make reduce greatly the working life of ball valve made of plastic, even causes that sealing fails.On the other hand, the arts demand later stage of adopting the valve body partitioned mode to make ball valve made of plastic is assembled assembly technology complexity, the shortcoming that processing cost is big.

In addition, have following shortcoming on the processing method of existing ball valve made of plastic: 1. the ball valve made of plastic valve body is a thick walled casting, is difficult to from the required precision of the last acquisition of injection molding machine, and especially when selecting material to be slow crystallization, the randomness of its crystallization distortion is very big.2. certainly will introduce the machining operation for reaching precision, but because valve volume is big and out-of-shape, difficulty of processing is big; 3. many, the complex manufacturing of the number of spare parts of ball valve; 4. to assembly precision require high, output efficiency is low; 5. take the valve of mechanical fastener technology processing, concentrated very big at the valve body stress at bolt position, in order to reduce stress level, have to increase the wall thickness of valve body, this measure directly causes the consumption of plastics.6. because plastics have bigger croop property, traditional Plastic valve is known from experience with the timeliness elongation at interior screw down valve, thereby causes sealing pair to lose efficacy; 7. the sealing problem in order to prevent that creep from causing, traditional valve takes to strengthen the magnitude of interference of sealing pair, and makes the sealing pair rapid wearing, finally also causes seal failure; 8. the magnitude of interference of sealing pair makes the valve switch operation very difficult, uses inconvenient; 9. consumptive material is many, and the manufacture cycle is long, the cost height.

No matter therefore for manufacturing enterprise and user, in the ball valve made of plastic development there be problem demanding prompt solution: avoid the machining processes and the plastic valve body stress of the ball valve body of plastics to concentrate from structure and processing method; The reliability of control valve deformation, simplification assembly technology and raising sealing; Make its switching manipulation easy; Reduce consumptive material and processing cost.

Summary of the invention

The purpose of this utility model is in order to overcome the shortcoming and defect that prior art exists, and provide a kind of and made that stress distribution is even, creep strain is little, good seal performance, switch moment are little, easy for installation, resources conservation and long eccentric spheroid embedded plastic ball valve of life-span.

For achieving the above object, the technical solution of the utility model is to comprise embedded eccentric spheroid, valve seat, valve body, valve rod and drive the driving mechanism that spheroid rotates, be provided with center flow channels in this off-centre spheroid, and its upper end is provided with footstalk, its lower end is provided with down footstalk, and the two cerebral hemispheres that should the off-centre spheroid the centre of sphere do not overlap with the horizontal center line of center flow channels, described valve rod is arranged at the last footstalk position of eccentric spheroid, it is characterized in that: described valve body is the plastic monoblock of a casting technology global formation.

Further being provided with is to be inserted in O-ring seals, Upper shaft sleeve and profiled seal ring on the described eccentric spheroid on the footstalk, the lower shaft sleeve of eccentric spheroid is gone into Lower shaft sleeve constitute revolute pair.

The last footstalk that further setting is described eccentric spheroid is provided with the umbrella shape boss, is provided with 90 ° of rotary spacing grooves of spacing cooperation with it in the described valve body accordingly.

Further being provided with is between valve seat in valve body and the valve body India rubber circle to be set, and forms the structure of the bit shift compensation of valve seat.

Adopt above-mentioned processing method and structure, solved the traditional double eccentric structure ball valve difficulty that spool can't rotate because of the space geometry reason when valve body is single integral body; Of the present utility model not only easily manufactured, and the direct cast molding of main parts size, the manufacturing efficiency height; Because spheroid adopts two eccentric structures, the length in the mechanical friction path of ball and valve seat has prolonged the life-span of motive sealing pair in the shortening valve switch process; Spheroid is provided with footstalk up and down simultaneously, and footstalk is provided with axle sleeve outward, can guarantee quality of fit; Before main assembly process is arranged in the whole casting of valve body, both significantly reduced the assembling work amount, valve body and the advantage that inner embedded piece can cooperate with valve body on geometry when utilizing casting have again been removed the valve interior wall machining of complex and expensive fully from; Valve seat and axle sleeve have been guaranteed the interior sealing of ball valve and have opened and closed operability that not only switch is easier to, and antifriction decreases by having good self lubricity material; Body cavity is provided with restriction spheroid rotating mechanism in 90 degree scopes, can realize accurate limiting to the switch of ball valve; Be provided with combination seal between valve body, ball mandrel handle, axle sleeve, the whole upward sealing that forms thus is provided with valve inner, has solved the last sealing problem of valve; Particularly two eccentric baton rounds are embedded in the valve body, can utilize inserts and valve body at casting the advantage of shape automatic synchronization to be arranged, and have solved the difficult problem that the valve inner Related Dimension Chain is difficult to guarantee.The utility model solves ball valve made of plastic and opens and closes accurate spacing problem of difficult, has adopted the new structure of sealing pairs such as valve body, valve seat, spheroid, thereby solves the long-time sealing difficult problem in ball valve made of plastic sealing and the using process.

The beneficial effects of the utility model are: 1. the utility model valve body is set to an overall structure type, allow the load of the valve left and right sides realize short circuit by the valve body of overall structure type, make the material stress on the valve body be evenly distributed like this, avoid producing the stress concentration phenomenon, therefore structurally improved working life of valve and withstand voltage greatly at the valve body sensitive part; 2. the spheroid of having taked two off-centre makes valve that enough magnitude of interference be arranged when closing as spool, can guarantee the proper functioning of valve base sealing pair, greatly reduces switch moment again, reduces the wearing and tearing of valve seat motive sealing pair; 3. utilize the processing method of technological ball, solved valve body and be single when whole two eccentric structure spools because the difficulty that the space geometry reason can't be rotated; 4. fully phase out the valve interior wall machining of complex and expensive, improved the quality of fit of valve body and embedded piece; 5. valve seat is arranged to the structure of bit shift compensation, can be compensated the minimizing of the potted line upward pressure that produces because of the valve body creep, thereby can guarantee the long-term safety work of valve base sealing sealing pair; 6. the position-limit mechanism that is provided with of the last footstalk of spool, the accurate location of ball valve switch in the time of guaranteeing to operate; 7. the ball valve main parts size adopts the plastics cast molding, and valve body adopts whole casting once-through; 8. valve body needn't piecemeal production, utilize technological ball with main assembly process be arranged in adopt whole casting once-through in the mould before, reduced the assembling work amount, reduced consumptive material, reduced cost of production; 9. valve nominal size scope can reach DN15～400, and nominal pressure can reach 0.4～1.6MPa; 10. ball valve made of plastic with can adopt the existing various Placements that meet corresponding code requirement being connected of pipe way.

Below in conjunction with specification drawings and specific embodiments the utility model is done further introduction.

Description of drawings

Embedded eccentric ball valve structural representation Fig. 1 of Fig. 1 the utility model valve;

Embedded eccentric ball valve structural representation Fig. 2 of Fig. 2 the utility model valve;

Fig. 3 valve body adds the man-hour technological ball and lay schematic representation in mould;

Horizontal cross-sectional view during the valve opening of Fig. 4 the utility model valve;

Horizontal cross-sectional view during the valve closing of Fig. 5 the utility model valve;

The valve body of Fig. 6 the utility model valve rotary spacing groove position horizontal sectional drawing.

Embodiment

Below by embodiment the utility model is carried out concrete description; only be used for the utility model is further specified; can not be interpreted as the qualification to the utility model protection domain, the technician in this field can make some nonessential improvement and adjustment to the utility model according to the content of above-mentioned model utility.

As Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, shown in Figure 6, include valve body 1, Lower shaft sleeve 2, eccentric spheroid 3, plastic seat 4, special-shaped seal ring 5, the driving mechanism 8 that Upper shaft sleeve 6, driving spheroid rotate.

Eccentric spheroid 3 adopts the plastics cast molding; Eccentric spheroid 3 upper ends are provided with footstalk 31, and last footstalk 31 is inserted in by O RunddichtringO 32, Upper shaft sleeve 6, profiled seal ring 5 and combines combination seal; Eccentric spheroid 3 lower ends are provided with down footstalk 33, and following footstalk 33 is inserted in Lower shaft sleeve 2 and forms revolute pair; Eccentric spheroid and Sealing thereof and packing are prefabricated into technological ball 11 together, as shown in Figure 3; Plastic seat 4 is contained on the valve body 1, and the sealing when ball valve is closed is realized shown in Fig. 4-5 by the eccentric interference of plastic seat 4 and eccentric spheroid 3; Fig. 1 and profiled seal ring shown in Figure 55 and and O RunddichtringO 32 select rubber material and die sinking moulding for use, plastic seat 4 and Upper shaft sleeve 6 and Lower shaft sleeve 2 then employing have the self lubricity material and make through machining; Technological ball 11 is placed in the mold cavity of mould 9 of

valve body

1,10 is metal valve stem among the figure, and 12 is the core rod of mould, to cavity injection High Temperature High Pressure plastic melt, adopts a casting technology with valve body 1 global formation behind the matched moulds; After the half product cooling of valve body 1 global formation, the packing on the technological ball 11 13 to be removed, the present embodiment packing preferably adopts mineral salt or ice, obtains the gap of eccentric spheroid 3 and valve body 1 inwall; At this moment, eccentric spheroid 3 can rotate in the ball-type chamber of valve body 1, realizes closing and opening of valve by this, shown in Fig. 4-5 two limit position; The last footstalk 31 of described eccentric spheroid 3 is provided with the umbrella shape boss, is provided with 90 ° of rotary spacing grooves 14 of spacing cooperation with it in the described valve body 1 accordingly, can guarantee the accurate location of the ball valve switch limit, is illustrated in figure 6 as; Driving mechanism for opening or closing 8 is installed on the valve rod of ball valve, and driving mechanism can adopt a kind of among handle (wheel) driving, worm and gear driving, hydraulic pressure or pneumatic or the Vidacare corp; Ball valve made of plastic and being connected that pipe carries out, its connection can adopt the various connection technologies that meet corresponding code requirement.

In addition, present embodiment can also be in valve body valve seat and valve body between the India rubber circle is set, form the structure of the bit shift compensation of valve seat, can compensate the minimizing of the potted line upward pressure that produces because of the valve body creep, thereby can guarantee the long-term safety work of valve base sealing sealing pair.

Certainly, above embodiment just plays the effect of explaining to the utility model, rather than limits, and any improvement to the utility model unsubstantiality all should be within protection domain of the present utility model.

Claims

1. eccentric spheroid embedded plastic ball valve, comprise embedded eccentric spheroid, valve seat, valve body, valve rod and drive the driving mechanism that spheroid rotates, be provided with center flow channels in this off-centre spheroid, and its upper end is provided with footstalk, its lower end is provided with down footstalk, and the two cerebral hemispheres that should the off-centre spheroid the centre of sphere do not overlap with the horizontal center line of center flow channels, described valve rod is arranged at the last footstalk position of eccentric spheroid, it is characterized in that: described valve body is the plastic monoblock of a casting technology global formation.

2. a kind of eccentric spheroid embedded plastic ball valve according to claim 1 is characterized in that: be inserted in O-ring seals, Upper shaft sleeve and profiled seal ring on the described eccentric spheroid on the footstalk, the lower shaft sleeve of eccentric spheroid gone into Lower shaft sleeve constitute revolute pair.

3. a kind of eccentric spheroid embedded plastic ball valve according to claim 1 and 2, it is characterized in that: the last footstalk of described eccentric spheroid is provided with the umbrella shape boss, is provided with 90 ° of rotary spacing grooves of spacing cooperation with it in the described valve body accordingly.

4. a kind of eccentric spheroid embedded plastic ball valve according to claim 3 is characterized in that: the India rubber circle is set between valve seat in valve body and the valve body, forms the structure of the bit shift compensation of valve seat.