阅读说明：本技术 一种一片式外丝球阀 (One-piece type external thread ball valve ) 是由 杨顺立 于 2018-08-01 设计创作，主要内容包括：本发明提出了一种一片式外丝球阀,用焊接式活接与管道连接,解决了用活接连接的丝扣式球阀在化工上推广的问题；小口径球阀的壳体厚度为4～6mm,如果设计一片式外丝球阀,壳体上垫片密封面的宽度只有2～3mm,按常规不能采用垫片密封,故一片式外丝球阀一直未在市场出现。我们将一片式球阀的压盖外侧做成斜面,与活接连接的阀体外螺纹管外侧也做成斜面,两个斜面倾斜角相同,在阀球安装后一起用车床加工,活接凸缘密封面也做成斜面,密封垫断面为梯形,外薄里厚。阀门安装活接后,与活接连接处的阀体斜面起密封作用,压盖斜面起固定密封垫作用,使用时在内压的作用下密封垫向外胀,压力越高密封效果越好。(The invention provides a one-piece external thread ball valve which is connected with a pipeline by welding type loose joints, and solves the problem of popularization of the thread ball valve connected by the loose joints in the chemical industry; the thickness of the shell of the small-caliber ball valve is 4-6 mm, if the one-piece type external thread ball valve is designed, the width of the sealing surface of the gasket on the shell is only 2-3 mm, the gasket cannot be adopted for sealing according to the conventional method, and therefore the one-piece type external thread ball valve is not in the market all the time. The outer side of a gland of a one-piece ball valve is made into an inclined plane, the outer side of an external threaded pipe of a valve body connected with a loose joint is also made into an inclined plane, the inclined angles of the two inclined planes are the same, the two inclined planes are machined together by a lathe after the valve ball is installed, the sealing surface of a flange of the loose joint is also made into an inclined plane, and the section of a sealing gasket is trapezoidal, and is thin outside and thick inside. After the valve is installed with the loose joint, the valve body inclined plane at the joint of the loose joint plays a sealing role, the gland inclined plane plays a role of fixing the sealing gasket, the sealing gasket expands outwards under the action of internal pressure during use, and the sealing effect is better when the pressure is higher.)

1. The utility model provides a piece formula external thread ball valve which characterized in that: the valve comprises a valve body (3), a stuffing box (9) is arranged on the outer side of the valve body (3), and the inner cavity of the stuffing box (9) is communicated with the inner cavity of the valve body (3);

the valve body (3) comprises a main body (31), and a connecting pipe (32) is integrally formed at one end of the main body (31);

a gland inlet cavity (36) and a connecting cavity (37) are sequentially arranged in the main body (31) in a penetrating manner along the axial direction of the main body, and the diameters of the gland inlet cavity and the connecting cavity are sequentially reduced; one end of the connecting pipe (32) is provided with a first conduction chamber (34), and the other end is provided with a first sealing groove (33);

a blocking ring groove (35) is concavely arranged on the side wall of the main body (31) along the radial direction, and the blocking ring groove (35) is communicated with the connecting cavity (37) and the inner cavity of the stuffing box (9); a ball core (4) is arranged in the connecting cavity (37);

a ball right gasket (2) is extruded between the ball core (4) and the inner wall of the valve body (3), and the ball right gasket (2) is positioned in a ball right gasket cavity (34);

a valve cover (10) is screwed in the gland inlet cavity (36) along the axial direction of the gland by screw threads, and a ball left pad (13) is extruded between the valve cover (10) and the ball core (4);

a valve rod (7) is slidably arranged in the stuffing box (9) along the axial direction of the stuffing box, and one end of the valve rod (7) extends into the valve body (3) and is tightly propped against the ball core (4);

a packing (5) is filled between the packing box (9) and the valve rod (7), a gland (8) is screwed at the upper part of the packing box (9) by threads, the lower end of the gland (8) is pressed above the packing (5), and the gland (8) is sleeved at the outer side of the valve rod (7);

a left pipe (12) is tightly propped against the outlet of the gland entering cavity, and a third sealing gasket (11) is extruded between the left pipe (12) and the outlet of the gland entering cavity; a second nut (16) is screwed on the outer side of the butt joint of the left pipe (12) and the valve body (3) by screw threads;

a right pipe (15) is tightly propped against the outlet of the ball right gasket cavity, and a sealing ring (1) is extruded between the right pipe (15) and the outlet of the ball right gasket cavity; a first nut (14) is screwed on the outer side of the butt joint of the right pipe (15) and the valve body (3) by screw threads; a handle (6) is fixed at the upper end of the valve rod (7) by screw threads.

2. The one-piece external thread ball valve according to claim 1, wherein: the valve cover (10) comprises a fastening nut (101) and a sealing ring seat (102); the sealing ring seat (102) comprises a blocking wall and an annular face; the blocking wall and the annular surface form a first positioning ring groove in an enclosing mode, and the ball left pad (13) is tightly pressed in the first positioning ring groove; the outer wall of fastening nut (101) is equipped with the external screw thread, the hole of fastening nut (101) is interior hexagonal structure, interior octagonal structure or interior half-groove structure.

3. The one-piece external thread ball valve according to claim 2, wherein: the fastening nut (101) and the sealing ring seat (102) are integrally formed.

4. The one-piece external thread ball valve according to claim 2, wherein: the fastening nut (101) and the sealing ring seat (102) are of a split structure.

5. The one-piece external thread ball valve according to claim 2, wherein: the contact end face of the valve cover (10) and the third sealing gasket (11) is an inclined plane, and the contact end face of the valve body (3) and the third sealing gasket (11) is an inclined plane;

after the valve cover (10) is installed, the end surface of the valve cover (10) and the end surface of the valve body (3) are on the same plane;

the third sealing gasket (11) is annular, and the longitudinal section of the side wall of the third sealing gasket is trapezoidal;

the side wall of the third sealing gasket (11) is tightly attached to the end face of the valve cover (10) and the end face of the valve body (3); and an included angle formed by the end surface of the valve body (3) and the radial direction of the valve body is more than or equal to 15 degrees and less than or equal to 30 degrees.

6. The one-piece external thread ball valve according to claim 2, wherein: the valve cover (10) and the valve body (3) are in plane contact with the contact end face of the third sealing gasket (11), the two contact end faces are on the same plane after installation, and the third sealing gasket (11) is in plane.

7. The one-piece external thread ball valve according to claim 1, wherein: the third sealing gasket (11) is made of polytetrafluoroethylene, reinforced polytetrafluoroethylene or p-polyphenyl.

8. The one-piece external thread ball valve according to claim 1, wherein: the sealing ring (1) is a metal arch ring, a polytetrafluoroethylene arch ring, a metal triangular ring, a polytetrafluoroethylene flat gasket and a rubber O-shaped ring.

9. The one-piece external thread ball valve according to claim 1, wherein: the valve rod (7) comprises a disc-shaped baffle plate (74), and a third rod section (73), a second rod section (72) and a first rod section (71) which are in a round rod shape are sequentially arranged on the upper top surface of the baffle plate (74);

the diameters of the baffle (74), the third rod segment (73), the second rod segment (72) and the first rod segment (71) are sequentially reduced; a round rod-shaped fourth rod section (75) is arranged on the lower bottom surface of the baffle plate (74); the diameter of the fourth rod section (75) is smaller than the diameter of the baffle (74); the third segment (73), the second segment (72), the first segment (71), the baffle (74), and the fourth segment (75) are concentric and integrally molded;

the third rod section (73), the second rod section (72) and the first rod section (71) are arranged in the stuffing box (9) in a penetrating way; the baffle plate (74) is tightly propped against the inside of the blocking ring groove (35).

10. The one-piece external thread ball valve according to claim 1, wherein: the valve body (3) and the stuffing box (9) are integrally formed or adopt a split structure.

11. The one-piece external thread ball valve according to claim 1, wherein: the right pipe (15) comprises a flange (1501), a positioning section (1502) and a butt welding pipe (1503) which are sequentially arranged along the axial direction of the right pipe;

the diameters of the outer walls of the flange (1501), the positioning section (1502) and the butt-welded pipe (1503) are reduced in sequence; a first transition surface is arranged between the outer wall of the flange (1501) and the outer wall of the positioning section (1502); a second transition surface is arranged between the outer wall of the positioning section (1502) and the outer wall of the butt-welded pipe (1503);

the first nut (14) comprises a nut main body (1401), and a threaded hole is arranged in the nut main body (1401) along the axial direction of the nut main body; a circular blocking ring (1402) is arranged at a port of the threaded hole, and the blocking ring (1402) extends along the radial circle center of the threaded hole.

Technical Field

The invention relates to the technical field of chemical machinery, in particular to a one-piece type external thread ball valve.

Background

The small-caliber pipeline, namely the pipeline below DN50, has the caliber of DN 15-50, the civil pipeline adopts a screw thread type ball valve, the industrial pipeline adopts a flange type ball valve, the weight of the flange type ball valve is 5-10 times of that of the screw thread type ball valve, and the price is much higher.

The civil small-bore metal pipeline comprises a galvanized water pipe, a gas pipeline and a natural gas pipeline, a one-piece internal thread ball valve is generally used, the ball valve is also called a wide-type ball valve, the connection mode of the ball valve and the pipeline is conical pipe threaded connection, sealing is realized by adopting a raw material belt, and the drawing is shown in figure 1. The wide ball valve has the defect of reducing diameter, the fluid drift diameter is smaller than the inner diameter of the pipe, for example, the inner diameters of DN15 and DN25 steel pipes are 15mm and 25mm respectively, while the drift diameters of DN15 and DN25 wide ball valves are 9.2mm and 15mm, and the fluid resistance is large. The wide-type ball valve has the defects that the valve rod has poor sealing performance, a special stuffing box is not designed, a drilling hole in the wall of the valve body serves as the stuffing box, and a sealing gasket is thin and is easy to leak. The one-piece thread-buckled ball valve also has an one-piece external thread ball valve connected by external threads, but is still in threaded connection with a conical pipe, a special stuffing box is not designed, and the number of the external thread-buckled ball valves is very small.

The diameter of the two-piece screw thread ball valve is equal to the nominal diameter of the pipeline, and the diameter of the valve ball is equal to or very close to the inner diameter of the pipeline. A stuffing box is specially designed on a valve body of the two-piece screw thread ball valve, and the sealing performance is superior to that of a wide-open ball valve. The two-piece screw thread ball valve is also generally an internal screw, is connected with a pipeline in a conical pipe threaded connection mode, is sealed by a raw material belt, and is mainly used in industrial low-temperature low-pressure non-inflammable and explosive medium occasions.

The thread of the conical pipe is sealed, the thread leaks when the conical pipe is withdrawn, and the thread still leaks at the original position, so that the thread ball valve can only be connected by loose joint and is sealed by a gasket if the thread ball valve is used on a chemical process pipeline. The loose joint has small size and narrow sealing surface, the gasket is easy to break when the loose joint is sealed by the asbestos gasket in the past, and the loose joint is sealed by the rubber gasket at present. The rubber is easy to age and not heat-resistant, is soft at a temperature of less than 100 ℃, and can only be used at low temperature and low pressure. The screw thread type ball valve has the defect that a valve rod packing box is very short, the packing height of the two-piece screw thread ball valve is only 4-6 mm, a gland can only feed 2-3 wires, and a compression ring is not arranged. Therefore, the screw thread type ball valve cannot be popularized in chemical engineering all the time, is not allowed to be used on chemical engineering process pipelines, has no leakage point and leakage point when being used for water pipes, and is not allowed to leak and leak chemical inflammable and explosive and toxic media.

Metal triangular ring sealing pad (CN204717181U) and metal bow-shaped ring sealing pad (CN206377375U), the sealed problem of having solved the loose joint and having used in the chemical industry, bow-shaped ring and triangular ring all belong to the self sealss, rely on the resilience of internal pressure and metal to seal, and the nut tightening torque that needs is very little, and low temperature low pressure, high temperature high pressure all can use, and metal sealing pad can use more than 1000 times repeatedly. The high-platform thread ball valve (CN205689796U) adopts a method of reducing the diameter of the valve rod, the height of the packing box is doubled, the packing box is designed according to the standard of a petrochemical ball valve, and the gland is provided with a pressure ring, so that the defect that the thread ball valve packing box does not meet the requirements of chemical industry and petrochemical industry is overcome. The high-platform two-piece type external thread ball valve designed by the patent technology can be used for chemical process pipelines to replace small-caliber flange type ball valves. However, the ball valve is of two-piece type and has the defects of easy wire withdrawal and too long length. The valve body and the valve seat of the two-piece screw thread type ball valve are connected by threads, the threads are easy to withdraw by carelessness in the process of pipeline installation, and some valve factories adopt a spot welding method to solve the problem. Two-piece type external thread ball valve, including the connection loose joint on both sides, length and pipeline diameter ratio are 4 ~ 10, very incoordination. Due to the two defects, the welded loose joint connection thread type ball valve is slow to popularize.

The thickness of the shell of the small-caliber ball valve is 4-6 mm, the one-piece type external thread ball valve which is connected by sealing and loose joint of the gasket cannot be manufactured according to the conventional design, and even if the one-piece type external thread ball valve is designed, the width of the sealing surface of the gasket on the shell is only 2-3 mm, so that the first reaction of valve industry personnel to produce the one-piece type external thread ball valve is impossible. Therefore, the screw thread type ball valve connected by the loose joint cannot be popularized in the chemical industry.

Disclosure of Invention

The invention aims to provide a one-piece type external thread ball valve, which is used for solving the problems that the existing two-piece type external thread ball valve is large in length and easy to leak and the threads between the two pieces are easy to withdraw.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a one-piece type external thread ball valve comprises a valve body, wherein a stuffing box is arranged on the outer side of the valve body, and the inner cavity of the stuffing box is communicated with the inner cavity of the valve body; the valve body comprises a main body, and a connecting pipe is integrally formed at one end of the main body; a gland entering cavity and a connecting cavity are sequentially arranged in the main body in a penetrating manner along the axial direction of the main body, and the diameters of the gland entering cavity and the connecting cavity are sequentially reduced; one end of the connecting pipe is provided with a first conduction chamber, and the other end of the connecting pipe is provided with a first sealing groove; a blocking ring groove is concavely arranged on the side wall of the main body along the radial direction of the main body, and the blocking ring groove is used for communicating the connecting cavity with the inner cavity of the stuffing box; a ball core is arranged in the connecting cavity; a ball right pad is extruded between the ball core and the inner wall of the valve body and is positioned in a ball right pad cavity; a valve cover is screwed in the axial direction of the gland entering cavity by screw threads, and a ball left pad is extruded between the valve cover and the ball core; a valve rod is slidably arranged in the stuffing box along the axial direction of the stuffing box in a penetrating manner, and one end of the valve rod extends into the valve body and is tightly propped against the ball core; the packing is filled between the packing box and the valve rod, a gland is screwed at the upper part of the packing box by threads, the lower end of the gland is tightly pressed above the packing, and the gland is sleeved at the outer side of the valve rod; a left pipe is tightly propped against the outlet of the gland entering cavity, and a third sealing gasket is extruded between the left pipe and the outlet of the gland entering cavity; a second nut is screwed on the outer side of the butt joint of the left pipe and the valve body by threads; a right pipe is tightly propped against the outlet of the ball right gasket cavity, and a sealing ring is extruded between the right pipe and the outlet of the ball right gasket cavity; a first nut is screwed on the outer side of the butt joint of the right pipe and the valve body by threads; a handle is fixed at the upper end of the valve rod by screw threads.

The valve cover comprises a fastening nut and a sealing ring seat; the sealing ring seat comprises a blocking wall and an annular surface; the blocking wall and the annular surface form a first positioning ring groove in an enclosing mode, and the ball left pad is tightly pressed in the first positioning ring groove; the outer wall of the fastening nut is provided with external threads, and an inner hole of the fastening nut is of an inner hexagonal structure, an inner octagonal structure or an inner half-groove structure.

Wherein the fastening nut and the sealing ring seat are integrally formed.

Wherein, the fastening nut and the sealing ring seat are of split structures.

The contact end face of the valve cover and the third sealing gasket is an inclined face, and the contact end face of the valve body and the third sealing gasket is an inclined face;

after the valve cover is installed, the end surface of the valve cover and the end surface of the valve body are on the same plane;

the third sealing gasket is annular, and the longitudinal section of the side wall of the third sealing gasket is trapezoidal;

the side wall of the third sealing gasket is tightly attached to the end face of the valve cover and the end face of the valve body; the included angle formed by the end face of the valve body and the radial direction of the valve body is more than or equal to 15 degrees and less than or equal to 30 degrees.

The valve cover and the valve body are in plane contact with the contact end faces of the third sealing gasket, the two contact end faces are on the same plane after installation, and the third sealing gasket is a plane.

Wherein the third seal is polytetrafluoroethylene, reinforced polytetrafluoroethylene or polyparaphenylene.

Wherein, the sealing ring is a metal bow-shaped ring, a polytetrafluoroethylene bow-shaped ring, a metal triangular ring, a polytetrafluoroethylene flat gasket and a rubber O-shaped ring.

The valve rod comprises a disc-shaped baffle, and a third rod section, a second rod section and a first rod section which are in the shape of a round rod are sequentially arranged on the upper top surface of the baffle;

the diameters of the baffle, the third rod section, the second rod section and the first rod section are sequentially reduced; a round rod-shaped fourth rod section is arranged on the lower bottom surface of the baffle; the diameter of the fourth pole segment is smaller than the diameter of the baffle; the third pole segment, the second pole segment, the first pole segment, the baffle, and the fourth pole segment are concentric and integrally formed; the third rod section, the second rod section and the first rod section are arranged in the stuffing box in a penetrating mode; the baffle is tightly propped in the blocking ring groove.

The valve body and the stuffing box are integrally formed or adopt a split structure.

The right pipe comprises a flange and a positioning section butt-welding pipe which are sequentially arranged along the axial direction of the right pipe; the diameters of the flange, the positioning section and the outer wall of the butt-welded pipe are reduced in sequence; a first transition surface is arranged between the outer wall of the flange and the outer wall of the positioning section; a second transition surface is arranged between the outer wall of the positioning section and the outer wall of the butt-welded pipe;

the first nut comprises a nut body, and a threaded hole penetrates through the nut body along the axial direction of the nut body; the port of the threaded hole is provided with a circular blocking ring, and the blocking ring extends along the radial circle center of the threaded hole.

The invention has the following advantages:

a one-piece type external thread ball valve comprises a valve body, wherein a stuffing box is arranged on the outer side of the valve body, and the inner cavity of the stuffing box is communicated with the inner cavity of the valve body; the valve body comprises a main body, and a connecting pipe is integrally formed at one end of the main body; a gland entering cavity and a connecting cavity are sequentially arranged in the main body in a penetrating manner along the axial direction of the main body, and the diameters of the gland entering cavity and the connecting cavity are sequentially reduced; one end of the connecting pipe is provided with a first conduction chamber, and the other end of the connecting pipe is provided with a first sealing groove; a blocking ring groove is concavely arranged on the side wall of the main body along the radial direction of the main body, and the blocking ring groove is used for communicating the connecting cavity with the inner cavity of the stuffing box; a ball core is arranged in the connecting cavity; a ball right pad is extruded between the ball core and the inner wall of the valve body and is positioned in a ball right pad cavity; a valve cover is screwed in the axial direction of the gland entering cavity by screw threads, and a ball left pad is extruded between the valve cover and the ball core; a valve rod is slidably arranged in the stuffing box along the axial direction of the stuffing box in a penetrating manner, and one end of the valve rod extends into the valve body and is tightly propped against the ball core; the packing is filled between the packing box and the valve rod, a gland is screwed at the upper part of the packing box by threads, the lower end of the gland is tightly pressed above the packing, and the gland is sleeved at the outer side of the valve rod; a left pipe is tightly propped against the outlet of the gland entering cavity, and a third sealing gasket is extruded between the left pipe and the outlet of the gland entering cavity; a second nut is screwed on the outer side of the butt joint of the left pipe and the valve body by threads; a right pipe is tightly propped against the outlet of the ball right gasket cavity, and a sealing ring is extruded between the right pipe and the outlet of the ball right gasket cavity; a first nut is screwed on the outer side of the butt joint of the right pipe and the valve body by threads; a handle is fixed at the upper end of the valve rod by threads;

the length of the ball valve is reduced by 20-35% compared with that of a two-piece type external thread ball valve, and the ball valve is suitable for industrial pipelines of chemical engineering, pharmacy and the like; the valve rod adopts a reducing structure, the height of the packing box is doubled compared with that of the existing two-piece screw thread ball valve, and the gland is provided with a pressure ring and is suitable for medium-high pressure and chemical inflammable and explosive media; the problem that the ball valve cannot be connected with a pipeline through a loose joint is solved, the length of the loose joint type ball valve is shortened, and the screw thread type ball valve can replace a small-caliber flange type ball valve in chemical engineering; the invention has great significance for the popularization of the loose joint and the screw thread type ball valve in the chemical industry. The valve can also be used in the industries of petroleum, petrochemical industry, power generation, steel making and the like, and is a process pipeline for heavy industry in a word; because the reinforced polytetrafluoroethylene has elasticity, the reinforced polytetrafluoroethylene can be used only once unlike pure Polytetrafluoroethylene (PTFE), the sealing surface can be repeatedly used for a plurality of times when being a plane, and the use times can be increased when the sealing surface is a conical surface. The conical surface has the advantages that the sealing gasket is self-sealed, the sealing gasket expands outwards under the action of internal pressure, and the sealing performance is better when the pressure is higher; the outer side of a valve core gland of a one-piece ball valve is made into an inclined plane, the outer side of a valve body external thread pipe connected with a loose joint is also made into an inclined plane, the inclination angles of the two inclined planes are the same, and the two inclined planes are machined together by a lathe after the valve ball is installed. The sealing surface of the loose joint flange is also made into an inclined plane, and the section of the sealing gasket is trapezoidal, with a thin outside and a thick inside. After the valve is installed with the loose joint, the valve body inclined plane at the joint of the loose joint plays a sealing role, the gland inclined plane plays a role of fixing the sealing gasket, the sealing gasket expands outwards under the action of internal pressure during use, and the sealing effect is better when the pressure is higher.

Drawings

Fig. 1 is a structural schematic diagram of a one-piece internal thread ball valve.

Fig. 2 is a schematic structural view of a one-piece external thread ball valve of the present invention.

Fig. 3 is a cross-sectional view of the valve cover of the present invention.

Fig. 4 is a schematic view of the hexagonal socket structure of the fastening nut of the present invention.

Fig. 5 is a schematic view of an inner octagonal configuration of the fastening nut of the present invention.

Fig. 6 is a schematic view of the inner half-groove structure of the fastening nut of the present invention.

Fig. 7 is a schematic view of the structure of the valve stem of the present invention.

Fig. 8 is a cross-sectional view of the valve body of the present invention.

Fig. 9 is a cross-sectional view of the right tube of the present invention.

Fig. 10 is a cross-sectional view of a first nut of the present invention.

In the figure: 1-a sealing ring; 2-ball right pad; 3-a valve body; 31-a body; 32-connecting tube; 33-a first seal groove; 34-ball right gasket cavity; 35-a barrier ring groove; 36-gland access chamber; 37-a connecting lumen; 4-a ball core; 5-a filler; 6-a handle; 7-a valve stem; 71-a first pole segment; 72-a second pole segment; 73-a third pole segment; 74-a baffle; 75-a fourth pole segment; 8-pressing cover; 9-stuffing box; 10-valve cover; 101-a fastening nut; 102-sealing ring seat; 11-a third gasket; 12-left tube; 13-ball left pad; 14-a first nut; 1401-a nut body; 1402-baffle ring; 15-right tube; 1501-a flange; 1502-positioning section; 1503-welding the tubes; 16-second nut.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.