Ceramic ball valve

Abstract

The utility model relates to a ceramic ball valve which comprises a valve shell, a flow channel is formed in the valve shell, a valve cavity defined by four valve seats is arranged in the flow channel, a ball body is assembled in the valve cavity in a rotating mode, a through hole communicated with the flow channel is formed in the ball body, a valve shaft extending upwards is connected to the ball body, and the valve shaft penetrates through the valve seat on the top of the valve shaft to extend outwards. Cavities are formed between the ball body and the valve seat at the top and between the ball body and the valve seat at the bottom, the cavities are filled with lining assemblies, the appearance size of the lining assemblies is consistent with the size of the cavities, the lining assemblies comprise top linings and bottom linings, and the top faces of the bottom linings and the bottom faces of the top linings are provided with inwards-concave arc-shaped faces. A positioning part for keeping the arc center of the arc-shaped surface of the bushing assembly consistent with the ball center of the ball body is arranged between the bushing assembly and the left and right valve seats; a valve shaft allowing the valve shaft to penetrate through is arranged on the top lining. The problem that the opening and closing torque of the valve is abnormally increased due to accumulation and caking of materials in the valve cavity is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the ball valve field especially relates to a ceramic ball valve. BACKGROUND

[0002] The valve commonly used in various industries in China is metal valve, and the use of metal valve has a history of more than one hundred years, although metal valve is improved in structure and material, but is limited by the property of metal material, cannot adapt to the demand of more and more high wear, strong corrosion and other harsh working conditions, mainly reflects short service life, serious leakage, greatly influences the stability of system operation, the traditional metal valve urgently needs the thorough innovation from material, design and manufacturing process etc., however, ceramic material has excellent chemical corrosion resistance, wear resistance, high temperature resistance, scouring resistance and other performance advantages due to its physical characteristics, therefore, ceramic ball valve is widely used in coal chemical industry, polycrystalline silicon and other harsh working conditions.

[0003] At present, the ordinary ceramic ball valve seat and ball body adopt ceramic material, the shell adopts metal material, and no reliable sealing measures are taken between the ceramic part and the metal shell. The ceramic ball valve generally comprises a valve shell, a left and right extending flow channel is formed in the valve shell, a left and right symmetrical interval symmetrical valve seat is blocked at the middle position of the flow channel, a valve cavity is formed between the two valve seats, a ball body is rotatably assembled in the valve cavity, at the same time, installation holes are formed on the upper and lower ends of the valve shell corresponding to the valve cavity, a top valve seat and a bottom valve seat are blocked in the installation holes, a valve shaft is rotatably inserted in the top valve seat, the valve shaft is fixedly connected with the ball body, a handle is connected with the top of the valve shaft, a through hole is formed on the ball body in the horizontal direction, and the through hole and the flow channel are communicated and closed in the process of rotating the ball body with the valve shaft. In the actual use process, the four valve seats form a cylindrical chamber valve cavity, and the corresponding curved surface or tangential slope transition is arranged at the position where the valve cavity and the ball body through hole port abut, so as to realize the sealing assembly between the ball body and the valve cavity side wall.

[0004] However, the ball valve structure of this conventional form will form a cavity between the ball body and the upper and lower valve seats, which will have the following problems in actual use: in the process of rotating the ball body to open and close the flow channel, part of the flow enters the ball body through hole, and is squeezed into the above-mentioned cavity in the process of rotation, after the flow enters the cavity, it will accumulate for a long time, which will cause the flow to accumulate and clog in the cavity, resulting in abnormal increase of the opening and closing torque of the valve; at the same time, after the flow accumulates for a long time, the ball body and the valve cavity will be squeezed, resulting in sealing failure, gap between the ball body and the valve cavity, and failure of the ball valve. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a ceramic ball valve to solve the problem that the ball valve in the prior art forms a cavity between the valve cavity and the ball body, which will cause the flow to accumulate and clog, resulting in sealing failure and increase of opening and closing torque.

[0006] In order to solve the above problems, the ceramic ball valve adopts the following technical scheme:

[0007] The ceramic ball valve comprises a valve shell, a flow channel is formed in the valve shell, a valve cavity formed by four valve seats is arranged in the flow channel, a ball is rotatably assembled in the valve cavity, a through hole communicated with the flow channel is arranged in the ball, a valve shaft extending upward is connected to the ball, the valve shaft extends outward through the valve seat at the top, cavities are formed between the ball and the valve seat at the top and the valve seat at the bottom, a bushing assembly made of ceramic material is filled in the cavities, the outer dimensions of the bushing assembly are consistent with the dimensions of the cavities, the bushing assembly comprises a top bushing and a bottom bushing, the top surface of the bottom bushing and the bottom surface of the top bushing are both concave arc surfaces, and positioning portions for positioning and stopping cooperation with the bottom bushing and the top bushing respectively are arranged between the bushing assembly and the left and right two valve seats, so that the centers of the arc surfaces of the bushing assembly are consistent with the center of the ball.

[0008] In a preferred embodiment, the positioning portions comprise an upper positioning groove arranged at the upper end edge position of the top bushing and a lower positioning groove arranged at the lower end edge position of the bottom bushing, and positioning steps for being clamped into the upper positioning groove and the lower positioning groove are arranged on the opposite side walls of the left and right two valve seats.

[0009] In a preferred embodiment, the arc surface cooperation portions are arranged between the ball and the left and right two valve seats, the sealing cone surfaces matched with the surface of the ball are arranged at the hole end of the valve seat, and the bushing assembly is filled on the side of the sealing cone surface of the valve seat away from the center of the ball.

[0010] In a preferred embodiment, a valve hole is arranged on the valve shell corresponding to the extension position of the valve shaft, a valve cover is press-fitted above the top valve seat in the valve hole, a shaft shoulder for being press-fitted on the valve cover is arranged on the circumferential side of the valve shaft, a sealing gasket is arranged above the shaft shoulder in the valve cover, a blow-preventing baffle is arranged above the sealing gasket between the valve cover and the valve shaft, a packing cavity is arranged between the blow-preventing baffle and the valve shaft, and a gland is arranged above the packing cavity between the valve shaft and the blow-preventing baffle.

[0011] Compared with the prior art, the ceramic ball valve has the following beneficial effects: the cavity is filled with the bushing assembly, so that the gaps between the ball and the valve cavity at various positions are filled with the ceramic bushing, the flow into the valve cavity is reduced, and the problem of abnormal increase of the valve opening and closing torque caused by the accumulation and caking of the material in the valve cavity is avoided; meanwhile, the bushing filling structure made of ceramic material does not need to be designed with a sealing groove, and has a simpler structure, and the whole is a rigid structure, so that the support is more stable, and the problem of the ball shaking and shifting caused by the soft sealing ring being squeezed is avoided, and the flow leakage is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows:

[0013] Figure 1 is a specific embodiment structure schematic view of the ceramic ball valve of the present application;

[0014] Figure 2 is Figure 1 A local enlarged view of the A part;

[0015] Figure 3 is Figure 1 a local enlarged view of the B part in the A part;

[0016] Figure 4 is Figure 1 a structure schematic view of the bushing in the A part;

[0017] BRIEF DESCRIPTION OF DRAWINGS: 1-valve shell; 2-ball; 3-flow channel bushing; 4-valve seat; 5-valve cavity bushing; 6-valve cavity bushing; 7-through hole; 8-valve shaft; 9-handle; 10-valve cover; 11-blowing baffle; 12-pressing cover; 13-stuffing cavity; 14-top bushing; 15-bottom bushing; 16-upper positioning groove; 17-lower positioning groove; 18-positioning step; 19-end cover. DETAILED DESCRIPTION

[0018] In order to make the technical purpose, technical scheme and beneficial effects of the present application more clear, the technical scheme of the present application will be further described in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application, that is, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown herein can be arranged and designed in various different configurations.

[0019] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components. The terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can refer to mechanical or electrical connections, or internal connections between two elements, and can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Specific embodiments of the ceramic ball valve involved in this utility model are as follows: Figures 1 to 4 As shown, the ceramic ball valve includes a valve body 1, with a flow channel formed inside the valve body 1. A valve cavity formed by four valve seats 4 is arranged in the flow channel. A ball 2 is rotatably assembled inside the valve cavity. The ball 2 has a through hole 7 communicating with the flow channel. A valve shaft 8 extending upward is connected to the ball 2. The valve shaft 8 extends outward through the valve seat 4 at the top of the ball 2.

[0022] The valve shell 1 is a basic carrier for all other components, and the specific structure can not be limited. In this embodiment, the valve shell 1 is a four-way structure, which has a horizontally extending horizontal channel and a vertically extending vertical channel. The valve shell 1 has a flange connecting surface at both ends. The valve shell 1 has a receiving cavity at the intersection of the channels. The cross-sectional size of the receiving cavity is larger than that of the channel, and a step surface is formed between them. Each valve seat 4 is arranged in the receiving cavity formed by the step surface, and is limited by the step surface. Flow channel bushings 3 are fixed at both ends of the horizontal channel of the valve shell 1. The inner hole of the corresponding flow channel bushing 3 is a tapered hole. The four valve seats 4 are defined as upper valve seat, lower valve seat, left valve seat and right valve seat. The left valve seat and the right valve seat are cylindrical structures, the upper valve seat and the lower valve seat are plate structures, the top valve seat is a valve cavity bushing 5, and the bottom valve seat is a valve cavity bushing plate 6. The ball 2 is rotatably assembled in the valve cavity. The inner hole of the left valve seat and the right valve seat is coaxial with the inner edge of the tapered hole. A through hole 7 is formed in the corresponding ball 2, which is in communication with the inner hole of the flow channel bushing 3 to form a flow channel. The valve cavity bushing plate 6 is blocked at the bottom of the vertical channel of the valve shell 1, and the valve cavity bushing plate 6 is limited by the bolt passing through the end cover 19. The valve cavity bushing 5 is blocked at the top of the vertical channel of the valve shell 1, and the valve cover 10 is pressed above the valve cavity bushing 5. The valve shaft 8 of the corresponding ball 2 extends upward after passing through the valve cavity bushing 5 and the valve cover 10, and is connected with the handle 9 after passing through the valve shell 1. By rotating the handle 9, the ball 2 is rotated to control the opening and closing of the horizontal channel.

[0023] A through hole 7 is formed in the ball 2, which is coaxial with the inner hole of the valve seat. When the ball 2 rotates around the axis of the valve shaft 8, the through hole 7 is in communication with the inner hole, thereby realizing the opening and closing control of the ball valve.

[0024] A valve hole is formed in the valve shell 1 corresponding to the extension of the valve shaft 8. The valve cover 10 is pressed above the top valve seat in the valve hole. The valve shaft 8 has a shoulder for pressing on the valve cover 10. A sealing gasket is arranged above the shoulder in the valve cover 10. A blowout baffle 11 is arranged above the sealing gasket between the valve cover 10 and the valve shaft 8. The blowout baffle 11 has a packing cavity 13 between the valve shaft 8 and the blowout baffle 11. A gland 12 is arranged above the packing cavity 13 between the valve shaft 8 and the blowout baffle 11.

[0025] Correspondingly, cavities are formed between the ball 2 and the top valve seat and the bottom valve seat. The cavities are distributed above and below the ball 2. In order to prevent the flow into the cavity and affect the normal use of the ball valve, a bushing assembly made of ceramic material is filled in the cavity. The outer dimension of the bushing assembly is consistent with the size of the cavity. Therefore, the cavity can be filled with the rigid ceramic material bushing assembly to avoid gaps. Since all the components in the valve shell 1 are basically made of non-metallic ceramic material, the bushing assembly of the same material can ensure good support stability and wear resistance between the mating surfaces.

[0026] Specifically, the bushing assembly includes a top bushing 14 and a bottom bushing 15, the top surface of the bottom bushing 15 and the bottom surface of the top bushing 14 are both concave arc surfaces, the bushing assembly and the left and right two valve seats have positioning portions for positioning and stopping cooperation with the bottom bushing 15 and the top bushing 14 respectively to keep the arc center of the arc surface of the bushing assembly consistent with the ball center of the ball 2; the top bushing 14 is provided with a valve shaft 8 for the valve shaft 8 to pass through.

[0027] In order to realize positioning, the above-mentioned positioning portion includes an upper positioning groove 16 arranged at the upper end edge position of the top bushing 14, and a lower positioning groove 17 arranged at the lower end edge position of the bottom bushing 15, and the opposite side walls of the left and right two valve seats are provided with positioning steps 18 for being clamped into the upper positioning groove 16 and the lower positioning groove 17.

[0028] At the same time, in order to ensure the compactness of the structure, ensure the effectiveness of the sealing cooperation, and further prevent the flow from entering the cavity, the above-mentioned ball 2 and the left and right two valve seats have an arc surface cooperation portion, the inner hole end of the valve seat has a sealing taper surface adapted to the surface of the ball 2, and the bushing assembly is filled on the side of the sealing taper surface of the valve seat away from the ball center of the ball 2.

[0029] In actual work process, the flow enters the through hole 7 of the ball 2, and when the ball 2 is closed or opened, the flow at the hole of the through hole 7 follows the ball 2 to rotate into the side of the valve cavity perpendicular to the flow passage, at this time, due to the arrangement of the bushing assembly, the flow can be effectively prevented from entering the cavity, the material accumulation and caking in the valve cavity can be avoided to cause the abnormal increase of the valve opening and closing torque, the support is more stable, the problem of the soft sealing ring being squeezed to make the ball 2 shake and shift can be avoided, and the flow leakage can be avoided.

[0030] Finally, it should be explained that the above-mentioned embodiments are only used for illustration but not limit the technical scheme of the utility model, any equivalent replacement and modification or partial replacement of the utility model without departing from the spirit and scope of the utility model should be covered in the protection scope of the utility model claim.

Claims

1. A ceramic ball valve, comprising a valve body, wherein a flow channel is formed inside the valve body, and a valve cavity formed by four valve seats is arranged in the flow path. A ball is rotatably mounted inside the valve cavity, and a through hole communicating with the flow channel is provided in the ball. An upwardly extending valve shaft is connected to the ball, and the valve shaft extends outward through the valve seat at the top of the ball. Cavities are formed between the ball and the top and bottom valve seats. The valve valve is characterized in that... The cavity is filled with a bushing assembly made of ceramic material, the bushing assembly has the same size as the cavity, the bushing assembly comprises a top bushing and a bottom bushing, the top surface of the bottom bushing and the bottom surface of the top bushing are both concave arc surfaces, the bushing assembly and the two valve seats have positioning parts for positioning and stopping the bottom bushing and the top bushing respectively to keep the arc center of the arc surface of the bushing assembly consistent with the ball center of the ball.

2. The ceramic ball valve according to claim 1, characterized in that The positioning parts comprise an upper positioning groove arranged at the upper end edge position of the top bushing and a lower positioning groove arranged at the lower end edge position of the bottom bushing, and the opposite side walls of the two valve seats are provided with positioning steps for being clamped into the upper positioning groove and the lower positioning groove.

3. The ceramic ball valve according to claim 2, wherein The ball and the two valve seats have an arc surface matching part, the inner hole end of the valve seat has a sealing cone surface matched with the surface of the ball, and the bushing assembly is filled on the side of the sealing cone surface of the valve seat away from the ball center.

4. The ceramic ball valve according to claim 3, wherein The valve shell is provided with a valve hole corresponding to the extension of the valve shaft, a valve cover is press-fitted above the top valve seat in the valve hole, the valve shaft has a shaft shoulder for being press-fitted on the valve cover, a sealing gasket is press-fitted above the shaft shoulder in the valve cover, a blow prevention baffle is press-fitted above the sealing gasket between the valve cover and the valve shaft, the blow prevention baffle and the valve shaft have a packing cavity, and a gland is sealed above the packing cavity between the valve shaft and the blow prevention baffle.

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