Anti-scouring ball valve

Abstract

The utility model belongs to the technical field of valve production, and particularly relates to an anti-scouring ball valve which comprises a valve body, a first channel for fluid to pass through is arranged in the middle of the valve body, a valve core is rotatably connected in the valve body, a second channel for fluid to pass through is arranged in the middle of the valve core, and sealing parts are arranged on the two sides of the valve core in the valve body. The sealing part can be in sealing contact with the outer surface of the valve core; the two opposite surfaces, located in the rotating direction of the valve element, of the peripheral face of the second channel are each provided with a splitter plate used for dispersing high-pressure jet flow sprayed out in the initial state that the second channel and the first channel are rotationally aligned. Compared with the prior art, by arranging the splitter plate, the technical problems that in the prior art, due to the fact that high-pressure jet flow is formed at the opening moment of the ball valve to wash a sealing face, the surface of a sealing part is damaged, the sealing effect of the ball valve becomes poor, and the maintenance period of the ball valve is short are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to valve production technical field, especially relate to a kind of anti-erosion ball valve. BACKGROUND

[0002] Ball valve is the core component of modern industrial fluid control system, with its quick opening and closing, low flow resistance and high sealing performance, it occupies an important position in the field of oil and gas transportation, chemical production, electric power energy, etc. Its typical structure is composed of valve body, ball valve core, valve stem and sealing assembly, the flow control of flow passage is realized by 90° rotation of valve core. When the flow passage of valve core is aligned with the pipeline axis, the fluid can pass through almost without resistance; when the valve core is rotated to the vertical flow passage, the sealing pair (usually using metal-nonmetal material combination) between valve seat and valve core realizes static sealing through pre-tightening force. However, this classic design has exposed significant defects under dynamic conditions: at the moment of opening and closing of valve core, the damage of sealing surface caused by high-speed jet scouring has become a long-term unsolved problem in the industry.

[0003] Hydrodynamic research shows that when the valve core is rotated from the closed state to open, the narrow gap (about 0.05-0.2mm) between the valve core and the valve seat will cause a sharp pressure change. Taking DN150 ball valve as an example, under the pressure difference of 10MPa, the flow velocity at the gap can rise from 0 to 320m / s (supersonic range) in milliseconds, forming a microjet with very high kinetic energy density. The impact of this jet on the sealing surface contains multiple damage mechanisms: first, the particles carried by high-speed fluid (such as the oxide layer or catalyst powder falling off the inner wall of the pipeline) strip the sealing material with micro-cutting effect; second, the cavitation effect caused by local pressure drop produces micron-sized bubbles, and the instantaneous shock wave (peak pressure can reach 1.2GPa) released when the bubbles collapse causes fatigue fracture of soft sealing layer such as PTFE; third, in low-temperature conditions such as liquefied natural gas (LNG), the cold brittleness of the material further increases the erosion rate. Experimental data shows that the erosion amount of a single opening and closing cycle to the sealing surface is equivalent to the cumulative damage of the valve running for 300 hours under steady flow, which directly leads to the average maintenance period of high-pressure ball valve being shortened to 1 / 3 of that of traditional gate valve. SUMMARY

[0004] The utility model intends to provide a kind of anti-erosion ball valve, mainly used to solve the technical problems that the sealing surface is damaged due to high-pressure jet scouring sealing surface at the moment of opening of ball valve in prior art, so that the sealing effect of ball valve is poor, and the maintenance period of ball valve is short.

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] The utility model discloses an anti-erosion ball valve, including the valve body, the first channel of the middle part of valve body is provided with for fluid, the valve core is rotatably connected in the valve body, the second channel of the middle part of valve core is provided with for fluid, the sealing part is arranged at the both sides of valve core in the valve body interior, and the sealing part can be sealed with the outer surface of valve core, the surface of two opposite surfaces of the second channel is provided with the shunt plate in the rotation direction of valve core, and the high pressure jet of the initial state of the rotation alignment of second channel and first channel is dispersed.

[0007] Preferably, the shunt plate includes a base plate fixed to the surface of the second channel, and the base plate surface is provided with a plurality of flow guide grooves.

[0008] Preferably, the side of the base plate away from the surface of the second channel is provided in a circular arc shape, and the axis of the circular arc surface is parallel to the axis of the second channel.

[0009] Preferably, the edges of the base plate and the flow guide grooves are both provided in a rounded corner shape.

[0010] Preferably, the width of the flow guide groove is 1:15-20 times the diameter of the second channel.

[0011] Preferably, the length direction of the flow guide groove is parallel to the axis of the second channel.

[0012] Preferably, the length direction of the flow guide groove is not parallel to the axis of the second channel.

[0013] The beneficial effects of the utility model are as follows:

[0014] (1) When the valve core of the ball valve is rotated from closing to opening, the flow passage is narrow, the fluid passes through the gap between the valve core and the valve seat at high speed, the local pressure drops suddenly, the local high-speed jet is generated, and the erosion of the sealing surface is aggravated. After the shunt plate is arranged, the jet can be dispersed, the erosion of the jet to the sealing surface is reduced, the maintenance rate of the ball valve is reduced, the technical problem that the sealing surface of the sealing part is damaged due to the high-pressure jet generated when the ball valve is opened in the prior art, so that the sealing effect of the ball valve is poor, and the maintenance cycle of the ball valve is short is solved.

[0015] (2) When the end surface of the flow guide groove of the shunt plate is separated from the sealing part, the flow guide groove changes the direction of the jet, so that the generated high-speed jet flows along the direction of the flow guide groove, thereby avoiding the jet to the diagonal sealing part surface and reducing the erosion of the sealing part surface.

[0016] (3) When the length direction of the flow guide groove is not parallel to the axis of the second channel, the flow direction of the jet can be further changed, so that the jet in the residual water in the second channel of the valve core flows in a more irregular direction, the probability of the jet impacting the sealing part surface is reduced, and the erosion of the sealing part surface is further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0018] Figure 1 It is a perspective view of a kind of anti-scouring ball valve of the utility model patent;

[0019] Figure 2 It is a perspective view of the embodiment 1 of a kind of anti-scouring ball valve of the utility model patent;

[0020] Figure 3 It is the internal perspective view of the embodiment 1 of a kind of anti-scouring ball valve of the utility model patent;

[0021] Figure 4 It is the perspective view of a kind of anti-scouring ball valve of the utility model patent; Figure 2 The enlarged view of A of;

[0022] Figure 5 It is the internal perspective view of the embodiment 2 of a kind of anti-scouring ball valve of the utility model patent;

[0023] Figure 6 It is the perspective view of a kind of anti-scouring ball valve of the utility model patent; Figure 4 The enlarged view of B of.

[0024] The reference signs in the drawings of the specification include: valve body 1, first channel 11, valve core 2, second channel 21, base plate 3, flow guide groove 301. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0026] In the description of the utility model, it is necessary to explain that the orientation or positional relation indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side" and the like is the orientation or positional relation shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0027] In the description of the utility model, the meaning of several is one or more, and the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, and above, below, within and the like are understood as including the number. If the terms "first", "second", "third" are described, they are only for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0028] In the description of the utility model, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "setting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. The embodiments will be described below according to the overall structure of the utility model.

[0029] Embodiment 1:

[0030] As Figure 1 , Figure 2 , Figure 3As shown, a kind of anti-erosion ball valve, including valve body 1, first passage 11 for fluid through being provided with in the middle of valve body 1, valve body 1 is rotatably connected with valve core 2 in, second passage 21 for fluid through being opened in the middle of valve core 2, the sealing part of the valve body 1 inside is located at the both sides of valve core 2 and is set, and the sealing part can be sealed with the outer surface of valve core 2 Contact;The two opposite surfaces of the peripheral surface of the second passage 21 in the rotation direction of valve core 2 are provided with shunt plate, for dispersing the high-pressure jet of the initial state when the second passage 21 is rotatably aligned with the first passage 11, the shunt plate includes the base plate 3 integrally formed with the surface of second passage 21, and the both ends of base plate 3 are located in the second passage 21, and the horizontal distance from the edge of second passage is less than 1mm, a plurality of flow guide grooves 301 are opened on the surface of base plate 3, and in use, the end surface of flow guide groove 301 of shunt plate is separated from the sealing part, the flow guide groove 301 changes the direction of jet, so that the high-speed jet generated flows along the direction of flow guide groove 301, thereby avoiding the surface of diagonal sealing part, and reducing the erosion of the surface of sealing part;

[0031] As shown in the figure, Figure 2 The length direction of flow guide groove 301 is parallel to the axis of second passage 21, the jet injected into flow guide groove 301 is guided to the side wall connected with the jet gap, and the surface of sealing part is avoided, so that the erosion of the surface of sealing part is reduced.

[0032] The side of base plate 3 away from the surface of second passage 21 is provided with circular arc shape, and the axis of circular arc surface is parallel to the axis of second passage 21;The setting of circular arc surface can ensure that the diameter of second passage 21 is large enough when base plate 3 is set, and the flow of fluid is not affected by base plate 3. The edge of base plate 3 and the edge of flow guide groove 301 are both provided with rounded corners, to reduce the resistance suffered by fluid in the process of flowing, and the end of flow guide groove 301 is provided with rounded corner, when flow guide groove 301 is separated from the sealing part, fluid is ejected along the tangent direction of edge rounded corner, so that the jet direction of fluid deviates from the surface of sealing part, and the erosion of high-speed jet to sealing surface is further reduced.

[0033] The width of flow guide groove 301 and the diameter length ratio of second passage 21 is 1:17.8, and through test, under the ratio, the erosion frequency of jet to sealing part can be effectively reduced.

[0034] Example 2:

[0035] As shown in the figure, Figure 4 , Figure 5As shown, different from the embodiment 1, the length direction of the flow guide groove 301 is not parallel to the axis of the second channel 21. When the length direction of the flow guide groove 301 is not parallel to the axis of the second channel 21, the flow direction of the jet flow can be further changed, so that the jet flow in the water body remaining in the second channel 21 of the valve core 2 has more irregular flow direction, the probability of the jet flow impacting on the surface of the sealing part is reduced, and the erosion on the surface of the sealing part is further reduced.

[0036] The foregoing description of the specific exemplary embodiments of the present application is for the purpose of illustration and explanation and is not intended to limit the present application to the precise forms disclosed, and as such many modifications and variations will be apparent to the practitioner skilled in the art. Although embodiments of the present application have been shown and described, it is to be understood that these embodiments are merely exemplary of the principles and application of the present application. Therefore, specific features, structures, materials or characteristics described or depicted as being part of an embodiment can be combined with or substituted for features, structures, materials or characteristics of other embodiments in any suitable manner, and the description and examples are not to be taken in a limiting sense. The scope of the application is limited only by the claims.

Claims

1. A kind of anti-scouring ball valve, including valve body, first passageway is provided in the middle part of valve body for fluid, valve core is rotatably connected in the valve body, second passageway is opened in the middle part of valve core for fluid, the sealing part is arranged at the both sides of valve core in the valve body interior, and sealing part can be sealed with the outer surface of valve core Contact;With, The two opposite surfaces of the second channel peripheral surface in the rotation direction of the valve core are provided with flow distribution plates, which are used to disperse the high-pressure vortex ejected from the second channel when the second channel is rotationally aligned with the first channel in the initial state.

2. A ball valve according to claim 1, wherein The flow distribution plate comprises a base plate fixed to the surface of the second channel, and a plurality of flow guide grooves are formed on the surface of the base plate.

3. A ball valve according to claim 2, wherein The side of the base plate away from the surface of the second channel is provided in a circular arc shape, and the axis of the circular arc surface is parallel to the axis of the second channel.

4. A ball valve according to claim 3, wherein The edges of the base plate and the edges of the flow guide grooves are both provided in a rounded corner shape.

5. A ball valve according to claim 4, wherein The width of the flow guide groove is 1:15-20 times the length of the diameter of the second channel.

6. A ball valve according to claim 5, wherein The length direction of the flow guide groove is parallel to the axis of the second channel.

7. A ball valve according to claim 5, wherein The length direction of the flow guide groove is not parallel to the axis of the second channel.

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