CN204312752U - Double-eccentric ball valve sealing configuration - Google Patents

Abstract

The utility model relates to a sealing structure of a double eccentric ball valve, which comprises a valve body, a side body, a sealing seat body, a sealing body, a rotating rod, a support rod and an elastic device. The other end of the channel in the body is coaxially installed with a sealing seat body, and an elastic device is pressed between the sealing seat body and the transverse contact surface of the valve body; a support rod is coaxially installed longitudinally at the lower end of the valve body, and a coaxially installed longitudinally at the upper end of the valve body There is a rotating rod, and a sealing body is driven and installed in the valve body between the rotating rod and the supporting rod. The sealing body is an eccentric structure with a semi-circular arc surface, and the outer wall of the convex surface of the eccentric structure is sealed with the sealing seat body; the sealing body and the sealing seat body The contact surfaces are sprayed with welding tungsten carbide or hard alloy material coating. Due to the elastic device inside the sealing seat, the utility model can be realized only by finely grinding the seat body and the sealing body during processing, which reduces the processing cost and improves the sealing performance, and is suitable for petroleum and coal chemical fields.

Description

Double eccentric ball valve sealing structure

technical field

The utility model belongs to the field of valves, in particular to a double eccentric ball valve sealing structure.

Background technique

At present, the fixed sealing seat is matched with the sealing surface of the sealing body and the sealing surface of the sealing seat, relying on the weak elastic force of the sealing body itself to realize the tight seam. The sealing structure of the fixed sealing seat is realized by precision machining, which is relatively difficult to process, and is prone to defects such as poor sealing performance and large switching torque.

After searching, the following published prior patent technologies were found:

A composite sealing double ball fixed ball valve (application number 201120432796), including a valve body, a ball, a bearing seat and a valve seat, the valve seat includes a valve seat supporting ring, and the valve seat also includes a triangular rubber and a valve seat protection ring, the valve The sealing structure of the seat consists of three stages; from bottom to top, the first stage is the seat protection ring set between the seat support ring and the ball, and the second stage is the contact surface between the seat support ring and the ball is nickel-plated Hardened nickel metal layer, the third stage is the triangular rubber set between the valve seat support ring and the ball. The ball valve is designed with a composite sealing structure of the valve seat and a double ball structure, which greatly improves the sealing reliability and product life of the valve.

Two-way hard seal double eccentric ball valve (application number 200520098911). It includes a valve body, a bonnet connected to the valve body, the valve shaft passes through the bonnet, and two hemispheres or ball tables are arranged on the valve shaft. The ball centers of the two hemispheres or ball tables do not coincide with the horizontal centerline of the straight flow channel. , the ball centers of the two hemispheres or ball tables do not coincide, and a valve seat is provided at both ends of the medium inlet and outlet in the valve body. The two hemispheres or ball tables can be respectively contacted and sealed with the two valve seats. runner. The valve has very small water loss; it has the function of resistance to mud and sand wear and self-cleaning; it opens and closes quickly, and the eccentric shaft deflects 90° to realize opening and closing, and the time can be as short as 0.2S; it is suitable for high flow rate, straight-through flow channel, and strong eccentric shaft Suitable for high flow rate, no vibration; long life, small installation height; can realize two-way sealing. It is suitable for clean water, raw water, sewage, turbid ring water and other pipelines.

Comparative analysis shows that the technical content of this patent application has a relatively large difference in technical features compared with the prior art.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the prior art and provide a double eccentric ball valve sealing structure with simple structure, scientific design, easy installation, safety and reliability.

The utility model solves its technical problem and realizes by taking the following technical solutions:

A double eccentric ball valve sealing structure is characterized in that: it includes a valve body, a side body, a sealing seat body, a sealing body, a rotating rod, a support rod and an elastic device, the side body is fixedly installed at one end of the channel of the valve body, and the valve The other end of the channel in the body is coaxially installed with a sealing seat, and an elastic device is pressed between the sealing seat and the lateral contact surface of the valve body; a support rod is coaxially installed at the lower end of the valve body, and the upper end of the valve body is coaxially installed There is a rotating rod, and a sealing body is driven and installed in the valve body between the rotating rod and the supporting rod. The sealing body is an eccentric structure with a semi-circular arc surface, and the outer wall of the convex surface of the eccentric structure is sealed with the sealing seat body; the sealing body and the sealing seat body The contact surfaces are sprayed with welding tungsten carbide or hard alloy material coating.

Moreover, a plurality of elastic sealing rings are coaxially sleeved between the sealing seat body and the longitudinal contact surface of the valve body.

Advantage and positive effect of the present utility model are:

1. The sealing body and the sealing seat of the utility model are spray-welded with tungsten carbide or hard alloy materials, and the eccentric structure of the sealing body is used to reduce the large closing torque problem, and the sealing gap and the sealing seat are used to realize the piston effect, and rely on the sealing seat The piston effect, the medium pushes the sealing seat and the sealing body to achieve high-pressure elastic sealing, and the elastic sealing structure has been achieved.

2. Due to the elastic device inside the sealing seat, the utility model can be realized by finely grinding the seat body and the sealing body during the processing, which reduces the processing cost and improves the sealing performance, and is suitable for petroleum and coal chemical fields.

Description of drawings

Fig. 1 is the structural representation of the utility model;

FIG. 2 is a partially enlarged schematic diagram of part A in FIG. 1 .

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the utility model.

A sealing structure for a double eccentric ball valve, comprising a valve body 1, a side body 4, a sealing seat body 2, a sealing body 3, a rotating rod 5, a supporting rod 6 and an elastic device 7. Body, the other end of the channel in the valve body is coaxially installed with a sealing seat body, and an elastic device is pressed between the sealing seat body and the lateral contact surface of the valve body, and the elastic device provides pre-tightening force to the sealing seat body to maintain sealing; A support rod is coaxially installed at the lower end of the valve body, and a rotating rod is installed longitudinally and coaxially at the upper end of the valve body. A sealing body is installed in the valve body between the rotating rod and the supporting rod. The sealing body is an eccentric structure with a semicircular arc surface. , the convex outer wall of the eccentric structure is in sealing fit with the sealing seat body.

A plurality of elastic sealing rings are coaxially set between the sealing seat body and the longitudinal contact surface of the valve body.

The contact surfaces of the sealing body and the sealing seat are sprayed with welding tungsten carbide or hard alloy material coating 8. When the medium passes through the flow channel, the eccentric structure of the sealing body is used to reduce the large closing torque problem. Due to the elastic device in the sealing seat Push the seat body and sealing body to achieve low-pressure sealing, relying on the piston effect of the sealing seat body, the medium pushes the sealing body and sealing body to achieve high-pressure elastic sealing, and the elastic sealing structure has been achieved. Due to the elastic device inside the sealing seat, only the seat body and the sealing body need to be finely ground during the processing, which reduces the processing cost and improves the sealing performance.

Although the embodiments and drawings of the utility model are disclosed for the purpose of illustration, those skilled in the art can understand that various replacements, changes and modifications can be made without departing from the spirit and scope of the utility model and the appended claims. It is possible, therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims (2)

1. a double-eccentric ball valve sealing configuration, it is characterized in that: comprise valve body, lateral body, sealing pedestal, seal, dwang, strut and elastic device, passage transverse uniaxial one end of valve body is fixedly mounted with installation lateral body, the horizontal the other end of passage in valve body coaxially installs sealing pedestal, is pressed with elastic device between the lateral contact face of sealing pedestal and valve body; In valve body, lower end is longitudinally coaxially installed with strut, valve body upper end is longitudinally coaxially installed with dwang, in valve body between this dwang and strut, drive installation has a seal, and sealing body is the eccentric structure of semicircle cambered surface, and eccentric structure convex outer wall is sealed and matched with sealing pedestal; The surface of contact of seal and sealing pedestal is all coated with weldering Tungsten carbite or Hardmetal materials coating.

2. double-eccentric ball valve sealing configuration according to claim 1, is characterized in that: between described sealing pedestal and longitudinal surface of contact of valve body, coaxial sleeve is equipped with multiple elastic seal ring.