阅读说明：本技术 一种反冲洗球阀 (Backwashing ball valve ) 是由 谈玉英 潘建新 于 2020-06-12 设计创作，主要内容包括：本发明涉及一种反冲洗球阀,包括阀体和阀杆,所述阀体的阀腔中设有球体,所述球体上开设有贯通的流通通道,所述阀杆与球体连接,通过阀杆的扭转实现球体流通通道的方位调整,以此实现球阀的开启和闭合,所述流通通道周围的球面上设有多处凹陷区域,使得球体由全开状态旋转角度α时,凹陷区域与阀腔之间构成流动通道,流体在流动通道中产生涡流,实现对阀腔内壁的冲洗过程。与现有技术相比,本发明中的球体在开启一定角度后,部分流体由凹陷区域与阀腔之间构成流动通道,并在流动通道中产生涡流,实现对阀腔内壁的反冲洗过程,对阀腔死角进行冲洗增加介质对死角的介质的流动能力,减少无流速和低流速区域介质沉积或固化的风险。(The invention relates to a backwashing ball valve which comprises a valve body and a valve rod, wherein a ball body is arranged in a valve cavity of the valve body, a through circulation passage is formed in the ball body, the valve rod is connected with the ball body, the orientation adjustment of the ball body circulation passage is realized through the torsion of the valve rod, so that the opening and the closing of the ball valve are realized, a plurality of concave regions are arranged on a spherical surface around the circulation passage, when the ball body rotates by an angle alpha from a fully open state, a flow passage is formed between the concave regions and the valve cavity, and fluid generates vortex in the flow passage, so that the flushing process of the inner wall of the valve cavity is realized. Compared with the prior art, after the ball body is opened at a certain angle, part of fluid forms a flow channel between the sunken area and the valve cavity and generates vortex in the flow channel, so that the back washing process of the inner wall of the valve cavity is realized, dead corners of the valve cavity are washed, the flowing capacity of media in the dead corners is increased, and the risk of deposition or solidification of the media in areas without flow velocity and low flow velocity is reduced.)

1. The utility model provides a back flush ball valve, includes valve body (1) and valve rod (2), be equipped with spheroid (3) in the valve pocket of valve body, set up the circulation passageway that link up on spheroid (3), valve rod (2) are connected with spheroid (3), and the position adjustment of the circulation passageway of spheroid (3) is realized through the torsion of valve rod (2) to this realizes opening and closing of ball valve, its characterized in that, be equipped with many places depressed area (5) on the sphere around the circulation passageway for when spheroid (3) is by full open state rotation angle alpha, constitute flow channel between depressed area (5) and the valve pocket, the fluid produces the vortex in flow channel, realizes the process of washing to the valve pocket inner wall.

2. The backwash ball valve according to claim 1, wherein the rotation angle at which the inner wall of the valve chamber is washed satisfies 0 ° < α <90 °.

3. A backwash ball valve according to claim 1, characterized in that said rotation angle satisfies 10 ° < α <25 °.

4. A backwash ball valve according to claim 1, characterized in that the bottom surface of the recessed area (5) is a smooth milling surface.

5. A backwash ball valve according to claim 3, characterized in that the depth of said recessed area (5) is 2.5-5 mm.

6. A backwash ball valve according to claim 1, characterized in that said recessed area (5) is provided around the inlet end of said flow channel, said recessed area (5) being provided below the horizontal bisecting plane of the ball (3).

7. A backwash ball valve according to claim 1, characterised in that said recessed area (5) is provided around the inlet end of said flow channel, said recessed area (5) having a mirror-symmetrical configuration with the plane of symmetry being the horizontal plane of the ball (3).

8. A backwash ball valve according to claim 1, characterized in that the inlet end of the valve body (1) is provided with a front valve seat (4).

9. The backwash ball valve as claimed in claim 8, wherein the front valve seat (4) and the valve body (1) are of an integral structure or a two-segment split structure.

10. The backwash ball valve as claimed in claim 1, wherein the fluid is a readily sedimentable or crystallizable fluid.

Technical Field

The invention relates to the field of ball valves, in particular to a backwashing ball valve.

Background

Fixed ball valves are one of the most widely used valves in industry. In a fixed ball valve, a ball body has a stem, a support shaft, both of which are fixed to a valve body, and the position of the ball body is fixed so that it cannot be displaced by fluid pressure. The two sides of the ball are provided with valve seats which are pressed to the ball by the thrust of a spring and fluid to establish sealing specific pressure.

The main function of the valve is to cut off or connect the fluid passage in the pipeline, and a certain torque is applied to the valve rod by means of a handle or a driving device and is transmitted to the ball body, so that the ball body rotates by 90 degrees, and the through hole of the ball body is coincident with or perpendicular to the central line of the passage of the valve body, thereby realizing the action of fully opening or fully closing the valve.

In the existing ball valve, solid particle deposition is easily generated on the inner wall surface of the valve cavity and the bottom of the valve cavity, if the solid particle deposition is not cleaned in time, the deposition of the solid can cause the stacking of the inner wall surface of the valve cavity in the valve body, and pipeline safety accidents are easily generated by the similar medium of stacking thermal cracking reaction aiming at the liquid medium in a peptization state under a certain temperature state. The ball valve in the prior art can not realize in-situ flushing repair of the valve, namely, timely cleaning or maintenance is carried out aiming at deposition of dead angles of the inner wall surface of a cavity in the valve body in the operation of an online pipeline, so that the technical problem to be solved urgently in the field of ball valves is solved.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a backwashing ball valve, a flow channel is formed between a depressed area and a valve cavity, and a vortex is generated in the flow channel, so that the backwashing process of the inner wall of the valve cavity is realized, the dead angle of the valve cavity is flushed, the flowing capacity of a medium to the dead angle is increased, the risk of medium deposition or solidification heat fission in a no-flow-rate and low-flow-rate area is reduced, and the in-situ flushing repair of the valve is realized.

The purpose of the invention can be realized by the following technical scheme:

the backwashing ball valve comprises a valve body and a valve rod, wherein a ball body is arranged in a valve cavity of the valve body, a through circulation passage is formed in the ball body, the valve rod is connected with the ball body, the orientation adjustment of the ball body circulation passage is realized through the torsion of the valve rod, so that the opening and the closing of the ball valve are realized, a plurality of concave regions are arranged on the spherical surface around the circulation passage, when the ball body rotates by an angle alpha from a fully open state, the flow passage is formed between the concave regions and the valve cavity, fluid generates vortex in the flow passage, and the flushing process of the inner wall of the valve cavity is realized.

Further, the rotation angle satisfies 0 ° < α <90 ° when flushing the inner wall of the valve chamber.

Further preferably, the rotation angle satisfies 10 ° < α <25 °.

The rotation angle alpha depends on the distance between the edge of the concave area and the front valve seat in the fully opened state of the ball, namely, the larger the distance between the edge of the concave area and the front valve seat in the fully opened state of the ball, the larger the lower limit of alpha.

The difference between the upper and lower limits of α, that is, the maximum circumferential width of the concave region on the spherical surface, is larger as the maximum circumferential width is larger.

Further, the bottom surface of the recessed area is a smooth curved surface.

Further, the recessed area is a milled surface.

Furthermore, the valve rod and the ball body are reliably connected in a square mode, the stability of the center of the ball body is good, and the torque of the valve rod is light.

Further, the depth of the concave area is 2.5 mm-5 mm.

Furthermore, a heat-insulating jacket is arranged on the valve shell, and the valve is insulated at a certain temperature by utilizing steam, so that medium crystallization caused by low temperature is avoided.

Furthermore, the front and the back of the floating type integral valve seat are designed to be dustproof, so that a medium is effectively prevented from flowing into the valve seat sealing cavity from the valve body middle cavity.

Further, the inlet end of the valve body is provided with a front valve seat.

Furthermore, an integrated structure or a two-section type split structure is arranged between the front valve seat and the valve body.

In one embodiment of the invention, the recessed area is provided around the inlet end of the flow channel, and the recessed area is provided below the horizontal bisecting plane of the sphere.

As another embodiment of the present invention, the recessed area is disposed around the inlet end of the flow channel, the recessed area has a mirror symmetry structure, and the symmetry plane is a horizontal plane of the sphere. The inlet end of the valve body is provided with a front valve seat. Meanwhile, a back valve seat is not arranged, and a smooth flushing channel is formed for the valve cavity.

Further, the fluid is a readily precipitable or readily crystallizable fluid. It is especially suitable for peptizing, fibrous, micro solid particle, slurry and other medium.

Compared with the prior art, the backwashing ball valve is a single-valve-seat sealing ball valve, the valve seat is matched after removal, so that the dead angle of medium flowing in the valve cavity is avoided, the medium caking is caused, the spherical surface of the ball body is specially designed, part of fluid forms three backwashing diversion hole flowing channels between the sunken area and the valve cavity after the ball body is opened at a certain angle, and a vortex is generated in the flowing channels, so that the backwashing process of the inner wall of the valve cavity is realized, the dead angle of the valve cavity is flushed, the flowing capacity of the medium on the dead angle is increased, the risk of medium deposition or solidification in areas without flow velocity and low flow velocity is reduced, and the in-situ flushing repair of the valve is realized.

Drawings

FIG. 1 is a schematic view of a vertical section structure of an integrated backwash ball valve according to the present invention;

FIG. 2 is a schematic diagram of a horizontal cross-sectional structure of the integrated backwash ball valve of the present invention;

FIG. 3 is a schematic view of the backwash ball valve of the present invention in a closed state at a certain angle;

FIG. 4 is a flow field simulation analysis diagram of the backwash ball valve of the present invention at 10 degrees shut-down;

FIG. 5 is a flow field simulation analysis diagram of the backwash ball valve of the present invention at 15 degrees shut-down;

FIG. 6 is a schematic view of the 3D internal structure of the backwash ball valve of the present invention when closed at a certain angle;

FIG. 7 is a schematic diagram showing a vertical cross-sectional structure of a two-stage backwash ball valve according to the present invention.

In the figure: 1. the valve comprises a valve body, 2, a valve rod, 3, a ball body, 4, a front valve seat, 5, a concave area, 6, a transverse fixing bolt, 7 and a valve seat supporting body.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Example 1

The backwashing ball valve comprises a valve body 1 and a valve rod 2, wherein a ball body 3 is arranged in a valve cavity of the valve body, a through circulation passage is formed in the ball body 3, the valve rod 2 is connected with the ball body 3, the direction adjustment of the circulation passage of the ball body 3 is realized through the torsion of the valve rod 2, so that the opening and the closing of the ball valve are realized, a plurality of concave areas 5 are arranged on a spherical surface around the circulation passage, when the ball body 3 rotates by an angle alpha from a fully open state, the flow passage is formed between the concave areas 5 and the valve cavity, fluid generates a vortex in the flow passage, and the flushing process of the inner wall of the valve cavity is realized.

The rotation angle satisfies 0 degrees < alpha <90 degrees when the inner wall of the valve cavity is flushed, and the rotation angle satisfies 10 degrees < alpha <25 degrees when the valve cavity is specifically implemented. The rotation angle α depends on the distance between the edge of the recessed area 5 and the front valve seat 4 when the ball 3 is fully opened, i.e. the larger the distance between the edge of the recessed area 5 and the front valve seat 4 when the ball 3 is fully opened, the larger the lower limit of α. The difference between the upper and lower limits of α, that is, the maximum circumferential width of the concave region 5 on the surface of the spherical body 3, is larger as the maximum circumferential width is larger.

The bottom surface of the recessed region 5 is a smooth curved surface. The recessed area 5 is a pin milled surface. The valve rod and the ball body are reliably connected in a square mode, and the valve rod is good in center stability and light in torque. The depth of the concave area 5 is 2.5 mm-5 mm.

The recessed area 5 is arranged around the inlet end of the circulating channel, the recessed area 5 is of a mirror symmetry structure, and the symmetry plane is a horizontal plane of the sphere 3. Further, the inlet end of the valve body 1 is provided with a front valve seat 4. Meanwhile, a rear valve seat is not arranged, and a smooth flushing channel is formed. It can be seen that the backwash ball valve in this embodiment is a single-seat sealing ball valve, and the valve seat is matched after removal, so as to avoid dead angles of medium flow in the valve cavity and cause medium caking, the spherical surface of the ball body adopts a special design, after the ball body is opened at a certain angle, part of fluid forms a flow channel between the recessed area 5 and the valve cavity, and a vortex is generated in the flow channel, so that the backwash process of the inner wall of the valve cavity is realized, the dead angles of the valve cavity are washed to increase the flow capacity of the medium to the medium at the dead angles, the risk of medium deposition or solidification in areas without flow rate and low flow rate is reduced, and the in-situ washing repair of the valve is realized.

The valve shell is provided with a heat-insulating jacket, and the valve is insulated at a certain temperature by utilizing steam, so that medium crystallization caused by low temperature is avoided. The front and the back of the floating type integral valve seat adopt dustproof design, and a medium is effectively prevented from flowing into a valve seat sealing cavity from a valve body middle cavity.

In the embodiment, the front valve seat 4 and the valve body 1 are of an integrated structure, namely, the ball valve structure is a thin-wall ball valve, the valve cover structure is replaced by a cover plate, and the cover plate is directly connected with the valve body 1 through threads.

The spherical surface and the valve seat adopt advanced hardening spraying technology and unique powder formula. Such as:

1) the nickel-based alloy Ni60 of the main powder material for flame spray welding of the ball body is more than or equal to 1mm in thickness, HRC 60-65, Ni55 sprayed on the valve seat is more than or equal to 1mm in thickness, HRC 52-56, advanced treatment process can adapt to the change of high temperature of 650 ℃, erosion resistance and corrosion resistance can be realized, the service life of the main powder material of the valve is prolonged, and the final bonding strength is 270 MPa.

2) The nickel-based alloy Ni60+ WC of the main powder material for the flame spray welding of the ball body is more than or equal to 1mm in thickness and HRC 68-70 in thickness, the Ni60 sprayed on the valve seat is more than or equal to 1mm in thickness and HRC 60-65 in thickness, advanced treatment process can adapt to the change of high temperature of 650 ℃, erosion resistance and corrosion resistance can be realized, the service life of the main powder material of the valve is prolonged, and the final bonding strength is 270 MPa. If needed, the surface can be processed in a nano mode, and the surface hardness can reach HV 2200-3800; the use temperature is more than or equal to 600 ℃; the friction coefficient of the surface is between 0.06 and 0.10; has good anti-adhesion and anti-occlusion performance.

3) The ball body and the valve seat are ultrasonically sprayed with main powder material WC with the thickness not less than 0.25mm and HRC not less than 72, and the advanced treatment process can adapt to the change of high temperature of 540 ℃, resist scouring and corrosion, prolong the service life of the main powder material of the valve and finally achieve the bonding strength of 78 MPa.

The material sprayed on the surfaces of the ball body and the valve seat can be selected according to actual working conditions.

As a suitable scenario for the backwash ball valve in this embodiment, the fluid therein is a fluid that is easy to precipitate or crystallize. It is especially suitable for peptizing, fibrous, micro solid particle, slurry and other medium.

Flow field simulation analysis

Fig. 3 and 4 are respectively a flow field simulation analysis diagram when the backwash ball valve in this embodiment is closed by 10 degrees, and the cross-sectional velocity and the streamline distribution in the simulation data of the flow field can be known as follows: when the valve is fully opened, the flow speed of the passage between the ball body and the valve body is basically 0m/s, when the valve is closed by 15 degrees, the flow speed in the passage is highest, and vortex flows are generated in the flow passages formed between the recessed area 5 and the valve cavity.

By velocity flow trace it is known that: when the valve is fully opened, the liquid in the passage between the ball body and the valve cavity has no flowing effect, and after the valve is closed for a certain angle, the liquid in the passage between the ball body and the valve body flows out at one side of the outlet, which is related to the vortex.

The volume flow and the temperature of different opening degrees are compared to obtain that: the larger the closing angle, the larger the pressure loss and the smaller the volume flow. The temperatures of all parts under different opening degrees are basically consistent.

Example 2

In contrast to embodiment 1, the recessed area 5 is provided around the inlet end of the flow-through channel, and the recessed area 5 is provided below the horizontal bisecting plane of the ball 3, so that when the valve is closed at a certain angle α, flushing of the lower valve chamber is specifically achieved, instead of flushing the entire valve chamber as in embodiment 1.

Example 3

The valve seat 4 and the valve body 1 in the embodiment are of a two-section type split structure, referring to fig. 5, namely, the valve seat support body 7 is connected with the valve body 1 in a split mode through bolts, the floating front valve seat 4 is arranged between the valve seat support body 7 and the valve body 1, and the floating front valve seat 4 realizes elastic pre-tightening force through a spring.

The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.