CN210637535U

CN210637535U - Ball valve core

Info

Publication number: CN210637535U
Application number: CN201921514888.5U
Authority: CN
Inventors: 黄勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2020-05-29
Anticipated expiration: 2029-09-11

Abstract

The utility model provides a ball valve case belongs to valve technical field. It has solved the current poor problem of case leakproofness. The ball valve core comprises a spherical shell and an inner tube, wherein the spherical shell is spherical, the inner tube is arranged in the spherical shell and is in a circular tube shape, two opposite ends of the spherical shell are provided with circular openings, two ends of the inner tube are just opposite to the openings, outer chamfers are arranged on the outer sides of the end parts of the two ends of the inner tube, inner chamfers are arranged on the inner sides of the end parts of the two ends of the spherical shell, the outer chamfers of the inner tube correspond to the inner chamfer positions of the end parts of the spherical shell, and the inner chamfers and the inner. This ball valve case has sealed effectual advantage.

Description

Ball valve core

Technical Field

The utility model belongs to the technical field of the valve, a ball valve case is related to.

Background

A ball valve generally includes a valve body, a spherical valve element disposed in the valve body, a valve rod having an inner end connected to the valve element, and a handle connected to an outer end of the valve rod extending out of the valve body, and a sealing ring is disposed between the valve element and the valve body. The spherical valve core of the ball valve is of a symmetrical spherical structure on the whole, a through cylindrical through hole is arranged along the arrangement direction of the water inlet and the water outlet, and the outer side surface of the valve core is provided with a connecting hole or a connecting groove used for being connected with the valve rod. The manufacturing cost of the valve core of the ball valve accounts for about one third of the manufacturing cost of the whole ball valve, and the valve core of the ball valve has a high development value.

For example, the applicant has devised a method of making a ball valve cartridge comprising the steps of: a. preparation of processing: preparing a first metal round pipe, a second metal round pipe, and an upper die and a lower die which are arranged oppositely; b. respectively placing a first metal round pipe and a second metal round pipe between the upper die and the lower die; c. the upper die and the lower die move oppositely to extrude the first metal round pipe to form; d. demolding; e. and (5) stamping and expanding the demoulded second metal round pipe from inside to outside. According to the manufacturing method of the ball valve core, the ball valve core is obtained by sleeving and extruding the two metal circular pipes I and the two metal circular pipes II, compared with a common solid ball valve core, the cost is greatly reduced, and the processing efficiency is greatly improved.

However, the materials for manufacturing the valve core of the ball valve are all welded pipes with low manufacturing difficulty, wherein the welded pipes are pipes with seams on the surface, which are formed by bending and deforming plate-shaped materials such as stainless steel bands or stainless steel plates into shapes such as circles or squares and then welding the bent and deformed materials. Because of the seam pipe is after the preparation is accomplished, can remain unevenness's welding seam on its pipe wall, above-mentioned manufacturing method is direct establishes two covers of metal pipe one and metal pipe and extrusion for metal pipe both ends can inevitably lean on the welding seam of a metal pipe inboard, have the breach of different degree, probably cause the influence to the leakproofness of case.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned problem that prior art exists, provide a ball valve case, the technical problem that solve is how to improve the leakproofness of ball valve case.

The purpose of the utility model can be realized by the following technical proposal:

the utility model provides a ball valve case, including be the spherical shell and set up in be the tubulose inner tube of circle in the spherical shell, the both ends that the spherical shell is relative all have circular opening, the both ends of inner tube respectively with two the opening is just right, the both ends tip outside of inner tube has outer chamfer, a serial communication port, the inboard of spherical shell both ends tip has interior chamfer, the outer chamfer of inner tube with the interior chamfer position of spherical shell tip corresponds, and both paste mutually and lean on.

In this ball valve case, the spherical shell has open both ends tip, finally obtains smooth interior chamfer through modes such as turning or roll forming, and it is surperficial with the outer chamfer on the inner tube, and then can guarantee stability and leakproofness between the two when the outer chamfer at inner tube both ends pastes with the interior chamfer of spherical shell mutually. Simultaneously, the design of interior chamfer makes the spherical shell tip when extrusion, has changed the deformation pressure of spherical shell tip, makes its tip be difficult for taking place the fold under the deformation effect, can paste with the inner tube better and seal, further improves the leakproofness. The inner chamfer angle on the spherical shell is obtained by processing an outer chamfer angle on the outer side of the end part of the outer tube when the outer tube of the spherical shell is manufactured, then extruding the outer tube by a die to enable the outer tube to be gradually bent and closed along the radian of the die, and correspondingly, the inner chamfer angle required by the inner sides of two ends of the spherical shell after final forming can be formed because the tube wall at the end opening of the outer tube is thin and the outer wall of the spherical shell is a complete spherical surface during extrusion forming.

In the above ball valve core, the end of the inner tube does not protrude out of the end of the ball shell.

A manufacturing method of a ball valve core is characterized by comprising the following steps:

① preparing process, preparing an inner tube, an outer tube with a diameter larger than the inner tube, and an upper die and a lower die which are arranged oppositely, wherein the upper die and the lower die can form a spherical forming cavity after being combined, cylindrical forming heads are fixed in the upper die and the lower die, the two forming heads are arranged coaxially, the side part of the forming head is provided with a circular blocking shoulder which can be abutted by the end part of the inner tube, the side wall of the forming head between the end part of the forming head and the blocking shoulder is provided with a forming groove which is concave and circular, and the forming groove is arranged adjacent to the blocking shoulder;

② processing end parts, namely processing outer chamfers on the outer sides of the end parts of the two ends of the inner tube and processing outer chamfers on the end parts of the two ends of the outer tube;

③ placing into a molding cavity, namely sleeving the inner tube outside the molding head, making the end part of the inner tube abut against the stop shoulder of the molding head, and sleeving the outer tube outside the inner tube;

④ extrusion molding, wherein the upper mold and the lower mold move towards each other, and the end parts at the two ends of the outer tube are extruded through the inner wall of the molding cavity, so that the end parts at the two ends of the outer tube are stressed to shrink along the inner wall of the molding cavity until the two end parts of the outer tube respectively push the two ends of the inner tube to be clamped into the molding grooves of the two molding heads, and inner chamfers are formed at the inner sides of the two ends of the outer tube;

⑤ demoulding, wherein the upper and lower dies move reversely and separate, and the side wall of the forming head applies outward flaring force to the end parts of the outer and inner tubes which are separated from the forming groove, so as to finish flaring and obtain a valve core blank.

This manufacturing method of ball valve case forms outer chamfer at the tip processing of outer tube, the pipe wall at outer tube end portion has been attenuate, and the pressure angle when having changed the outer tube both ends and being extruded, the deformation pressure of outer tube has been improved, make the outer tube difficult emergence fold in extrusion process, here, the mode that processing formed outer chamfer and formed interior chamfer through the extrusion again compares in the process of chamfer in the direct processing formation, the outer tube end portion outer wall bore after enabling the processing chamfer reduces, the big fold that causes when having avoided the outer tube to be extruded and taking place great deformation, guarantee the planarization of shaping back spherical shell opening part, and then guarantee the leakproofness. In addition, the setting of shaping groove is all gone into the tip of outer tube and the tip of inner tube through the extrusion card for it is inseparabler to lean on between inner tube and the outer tube tip, and during the drawing of patterns, both deviate from the shaping inslot, can apply the effort of outside expansion to the inner tube by the great shaping head lateral wall of diameter, accomplish the flaring in the drawing of patterns promptly, directly obtain the case blank, reduced the process, improved machining efficiency.

In the above method for manufacturing a ball valve core, the outer side of the forming head has a tapered surface, and the diameter of the tapered surface is gradually reduced from the end of the forming head to the direction of the shoulder. The design of conical surface makes the shaping groove form naturally, and the gradual change of conical surface can apply the expansive force to the inner tube gradually when the drawing of patterns, guarantees the stability of expansion, and then guarantees the stability of finished product structure.

In the manufacturing method of the ball valve core, the end surface of the forming head and the outer side wall are in arc transition. The circular arc transition can facilitate the sheathing of the inner pipe and can not damage the inner wall of the inner pipe.

In the manufacturing method of the ball valve core, the blocking shoulder is arranged close to the bottom of the forming cavity.

In the above-mentioned method for manufacturing a valve core of a ball valve, in step ②, the end portions of the two ends of the outer tube are processed by rolling or turning to form outer chamfers, the rolling process can make the inner and outer walls of the end portion of the outer tube more flat, and can better abut against the outer chamfers of the inner tube to realize sealing, and meanwhile, the rolling process can make the end portions of the two ends of the outer tube more compact and uniform in density, thereby ensuring the stability of supporting and sealing.

Compared with the prior art, the ball valve core and the manufacturing method thereof have the following advantages:

1. through roll extrusion for outer pipe tip inner wall is more level and smooth, enables outer tube and inner tube laminating better sealed, guarantees sealed effect.

2. Through the roll extrusion processing to outer pipe end portion, make its tip density more even, the structure is compacter, has guaranteed the stability and the compressive strength of structure.

3. Carry out the roll extrusion to outer tube end portion and form outer chamfer, chamfer in the formation is become in the extrusion deformation of rethread, can make the outer wall diameter of outer tube end portion diminish, changed extrusion angle, improved the deformation pressure of outer tube, be difficult for taking place the fold under the deformation effect, make it can paste with the inner tube better and seal, further improve the leakproofness.

4. The whole processing process only comprises the steps of blanking, processing of the outer chamfer, extrusion forming and demolding, excessive procedures are not needed, the processing technology is simplified, the processing efficiency is improved, and necessary conditions are provided for automatic production.

Drawings

Fig. 1 is a schematic sectional view of the valve core of the ball valve.

Fig. 2 is a process flow chart of the manufacturing method of the ball valve core.

Fig. 3 is a schematic diagram of the method for making a ball valve core at step ③.

Fig. 4 is a schematic diagram of step ④ of the method for making a ball valve core.

Fig. 5 is an enlarged partial view of the outer tube at the skived surface.

In the figure, 1, a spherical shell; 2. an inner tube; 3. an opening; 4. chamfering the outer part; 5. turning noodles; 6. an outer tube; 7. an upper die; 8. a lower die; 9. a molding cavity; 10. a forming head; 11. a shoulder block; 12. forming a groove; 13. a conical surface.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, the ball valve core includes a spherical shell 1 and a tubular inner tube 2 disposed in the spherical shell 1, wherein two opposite ends of the spherical shell 1 have circular openings 3, and two ends of the inner tube 2 are respectively opposite to the two openings 3. The outer sides of the end parts of the two ends of the inner pipe 2 are provided with outer chamfers 4, the end parts of the two ends of the spherical shell 1 are provided with inner chamfers, the outer chamfers 4 of the end parts of the inner pipe 2 correspond to the inner chamfer positions of the inner wall of the spherical shell 1, and the inner chamfers are attached to each other. The end of the inner tube 2 does not protrude beyond the end of the spherical shell 1.

As shown in fig. 2, 3, 4 and 5, the manufacturing method of the ball valve core comprises the following steps:

① preparing, preparing a round pipe-shaped inner pipe 2, a round pipe-shaped outer pipe 6 with a pipe diameter larger than that of the inner pipe 2, and an upper die 7 and a lower die 8 which are arranged oppositely, wherein the upper die 7 and the lower die 8 can form a spherical forming cavity 9 after being combined, cylindrical forming heads 10 are vertically fixed on the lower side of the upper die 7 and the upper side of the lower die 8, and the two forming heads 10 are arranged coaxially.

Because the upper die 7 and the forming head 10 fixed on the lower die 8 have the same structure and are only in an up-down symmetrical structure, taking the forming head 10 on the lower die 8 as an example for structural description, the side part of the forming head 10 is provided with a circular blocking shoulder 11 against which the end part of the inner tube 2 can abut, the blocking shoulder 11 is arranged near the bottom of the forming cavity 9, the side wall of the forming cavity 9 between the end part of the upper end of the forming head 10 and the blocking shoulder 11 is provided with a forming groove 12 which is recessed and is circular, and the forming groove 12 is arranged adjacent to the blocking shoulder 11; in the embodiment, the outer side of the forming head 10 is provided with a conical surface 13, and the diameter of the conical surface 13 is gradually reduced from the end part of the forming head 10 to the direction of the retaining shoulder 11, so that a forming groove 12 is naturally formed above the retaining shoulder 11, and the end surface and the outer side wall of the forming head 10 are in arc transition;

② processing end parts, namely processing outer chamfers 4 on the outer sides of the end parts of the two ends of the inner tube 2 and processing outer chamfers on the outer sides of the end parts of the two ends of the outer tube 6;

preferably, the outer chamfer is formed by rolling.

③ is put into the molding cavity 9, the inner tube 2 is sleeved outside the molding head 10, the end part of the lower end of the inner tube 2 is abutted against the stop shoulder 11 of the molding head 10, and the outer tube 6 is sleeved outside the inner tube 2;

④ extrusion molding, namely driving the upper mold 7 and the lower mold 8 to move oppositely, extruding the end parts at the two ends of the outer tube 6 through the inner wall of the molding cavity 9, so that the end parts at the two ends of the outer tube 6 are stressed to gradually shrink along the inner wall of the molding cavity 9 until the two end parts of the outer tube 6 respectively push the two ends of the inner tube 2 to be clamped into the molding grooves 12 of the two molding heads 10, and at the moment, because the tube wall at the end part of the outer tube 6 is thinner, the outer side surface of the outer tube gradually shrinks to form a spherical surface along the inner wall of the molding cavity 9, the;

⑤ demoulding, namely driving the upper die 7 and the lower die 8 to move reversely and separate, and applying outward flaring force to the end parts of the outer pipe 6 and the inner pipe 2 which are separated from the forming groove 12 by the conical surface 13 of the forming head 10 to finish flaring and obtain a valve core blank;

⑥ polishing, namely turning and polishing the outer spherical surface of the valve core blank to obtain the finished valve core.

According to the manufacturing method of the ball valve core, the outer chamfer is formed at the end part of the outer pipe 6 in a rolling processing mode, the pipe wall of the end part of the outer pipe 6 is thinned, large wrinkles caused when the outer pipe 6 is extruded to generate large deformation are avoided, the smoothness of the opening 3 of the ball shell 1 after molding is ensured, and the sealing performance is further ensured. Meanwhile, the joint of the pipe wall of the outer pipe 6 can be flattened in a rolling processing mode, and the tightness and the sealing performance of the inner pipe 2 and the outer pipe 6 when the inner pipe and the outer pipe abut against each other are guaranteed. In addition, the end of the outer pipe 6 and the end of the inner pipe 2 are clamped in through extrusion due to the arrangement of the forming groove 12, so that the end of the inner pipe 2 and the end of the outer pipe 6 are abutted more tightly, the two parts are separated from the forming groove 12 during demolding, an outward expanding acting force can be applied to the inner pipe 2 by the side wall of the forming head 10 with a large diameter, namely, flaring is completed during demolding, a finished valve core is directly obtained, the process is reduced, and the processing efficiency is improved.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a ball valve case, including be ball shell (1) of ball form and set up in be pipe form inner tube (2) in ball shell (1), the both ends that ball shell (1) is relative all have circular opening (3), the both ends of inner tube (2) respectively with two opening (3) are just right, the both ends tip outside of inner tube (2) has outer chamfer (4), its characterized in that, the inboard of ball shell (1) both ends tip has interior chamfer, the outer chamfer (4) of inner tube (2) with the interior chamfer position of ball shell (1) tip corresponds, and both paste mutually and lean on.

2. A ball valve cartridge according to claim 1, characterized in that the end of the inner tube (2) does not protrude beyond the end of the ball housing (1).