1. A closed safety ball valve comprises a valve body (1), an upper valve rod (2), a lower valve rod (3), a ball body (4) and a valve seat (5), wherein the ball body (4) is rotatably arranged in the valve body (1) through the upper valve rod (2) and the lower valve rod (3), and the valve seat (5) is arranged between the ball body (4) and the valve body (1) and is in sealing fit with the ball body (4);

the method is characterized in that: an upper sealing end cover (6) is arranged at the upper end of the valve body (1), and the upper valve rod (2) is arranged between the upper sealing end cover (6) and the ball body (4);

still include drive shaft (7), be equipped with drive gear (41) on spheroid (4), drive shaft (7) one end is connected with drive arrangement, and the other end stretches into valve body (1) to be connected with drive gear (71) with drive gear (41) matched with, drive shaft (7) can pass through drive gear (71), drive gear (41) and drive spheroid (4) rotation action.

2. The closed, safety ball valve of claim 1, wherein: the transmission gear (41) and the driving gear (71) are bevel gears.

3. The closed, safety ball valve of claim 1, wherein: the transmission gear (41) is a worm gear, and the driving gear is a worm.

4. The closed, safety ball valve of claim 1, wherein: an annular boss (42) is formed in the center of the upper end of the ball body (4), the upper end of the upper valve rod (2) is fixedly connected with the upper sealing end cover (6), and the lower end of the upper valve rod is inserted into the inner ring of the annular boss (42) to be in rotating fit with the ball body (4).

5. The closed, safety ball valve of claim 4, wherein: the transmission gear (41) is sleeved on the annular boss (42) and is fixedly connected with the annular boss (42).

6. The closed, safety ball valve of claim 1, wherein: and a packing sealing assembly (9) is arranged between the driving shaft (7) and the valve body (1).

Background

The ball valve is a valve whose opening and closing part is a ball body and is driven by a valve rod and can make rotary motion around the axis of the ball valve, and can be used for regulating and controlling fluid.

The fixed ball valve generally comprises a valve body, a ball body, an upper valve rod and a lower valve rod, wherein the ball body is rotatably arranged in the valve body through the upper valve rod and the lower valve rod, the upper end of the upper valve rod penetrates out of the valve body to be connected with an operating hand wheel or a driving actuator, and the upper valve rod drives the ball body to rotate to realize opening and closing actions.

However, in the existing ball valve, the upper valve rod is required to bear not only the torsional stress generated when the driving ball body rotates, but also the shear stress generated when the medium impacts the ball body, and the upper valve rod is easy to fatigue and break until flying out after long-time use, so that the service life is short, and certain potential safety hazards exist.

Disclosure of Invention

In order to overcome the defects of the background art, the invention provides a closed safety ball valve.

The technical scheme adopted by the invention is as follows: a closed safety ball valve comprises a valve body, an upper valve rod, a lower valve rod, a ball body and a valve seat, wherein the ball body is rotatably arranged in the valve body through the upper valve rod and the lower valve rod, and the valve seat is arranged between the ball body and the valve body and is in sealing fit with the ball body; the upper end of the valve body is provided with an upper sealing end cover, and the upper valve rod is arranged between the upper sealing end cover and the ball body; the ball valve further comprises a driving shaft, a transmission gear is arranged on the ball body, one end of the driving shaft is connected with a driving device, the other end of the driving shaft extends into the valve body and is connected with a driving gear matched with the transmission gear, and the driving shaft can drive the ball body to rotate through the driving gear and the transmission gear.

The transmission gear and the driving gear are bevel gears.

The transmission gear is a worm gear, and the driving gear is a worm.

An annular boss is formed in the center of the upper end of the ball body, the upper end of the upper valve rod is fixedly connected with the upper sealing end cover, and the lower end of the upper valve rod is inserted into the inner ring of the annular boss to be in rotary fit with the ball body.

The transmission gear is sleeved on the annular boss and is fixedly connected with the annular boss.

And a packing seal assembly is arranged between the driving shaft and the valve body.

The invention has the beneficial effects that: by adopting the scheme, the upper end of the valve body is provided with the upper sealing end cover, the upper valve rod is sealed in the valve body, the driving shaft is additionally arranged, the driving shaft drives the ball body to rotate in a gear transmission mode to realize opening and closing actions, so that the upper valve rod only bears the shearing stress of the ball body on the upper valve rod, the service life of the upper valve rod is prolonged, and the upper valve rod is safe and reliable even if the upper valve rod is broken.

Drawings

Fig. 1 is a schematic structural diagram 1 of a closed safety ball valve according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram 2 of the closed safety ball valve according to the embodiment of the invention.

Detailed Description

The embodiments of the invention will be further described with reference to the accompanying drawings in which:

as shown in the figure, the closed safety ball valve comprises a valve body 1, an upper valve rod 2, a lower valve rod 3, a ball body 4, a valve seat 5 and a driving shaft 7.

An upper sealing end cover 6 is installed at the upper end of the valve body 1, the upper end of the upper valve rod 2 is fixedly connected with the upper sealing end cover 6, a lower sealing end cover 8 is installed at the lower end of the valve body 1, the lower end of the lower valve rod 3 is fixedly connected with the lower sealing end cover 8, the ball body 4 is arranged in the valve body 1 and forms rotating fit with the upper valve rod 2 and the lower valve rod 3, the ball body 4 can rotate around the upper valve rod 2 and the lower valve rod 3, and the valve seat 5 is arranged between the ball body 4 and the valve body 1 and is in sealing fit with the ball body 4.

The upper end center of spheroid 4 is formed with annular boss 42, annular boss 42 inner circle and the cooperation of last valve rod 2 lower extreme, the outer lane of annular boss 42 is fixed and is provided with drive gear 41, inside drive shaft 7 one end stretched into valve body 1 to be equipped with the drive gear 71 with drive gear 41 looks adaptation, the other end stretches out to the valve body 1 outside, and be connected with drive arrangement, drive arrangement can be hand wheel 72, also can adopt other automatic actuator, and through ordering about drive shaft 7 rotatory, drive shaft 7 drives spheroid 4 around valve rod 2 and lower valve rod 3 rotatory through the gear drive between drive gear 71 and the drive gear 41, thereby realizes opening and close the action.

The transmission gear 41 and the driving gear 71 are bevel gears and are meshed with each other, and can also be in transmission fit with a worm gear and a worm, the transmission gear is a worm gear, the driving gear is a worm, the driving shaft 7 can be horizontally arranged, and the whole layout is more reasonable.

Still be equipped with packing seal assembly 9 between drive shaft 7 and the valve body 1, packing seal assembly 9 includes sealing filler and gland, has both guaranteed the reliable sealed between drive shaft 7 and the valve body 1, realizes the axial limiting displacement of drive shaft 7 again, plays and prevents blowing off the effect.

Adopt above-mentioned scheme, go up valve rod 2 and last end cover 6 and keep fixed, lower valve rod 3 and lower end cover 8 keep fixed, go up valve rod 2 and lower valve rod 3 and only play the effect of installation spheroid 4, make spheroid 4 can be at last valve rod 2 and lower valve rod 3 go up the rotary motion, consequently go up valve rod 2 and only bear spheroid 4 and receive the shear stress to its production when assaulting by the medium, thereby the life of going up valve rod 2 has been prolonged, and go up valve rod 2 and seal inside 1 valve body through last end cover 6 completely, even long-time back of using, go up valve rod 2 fracture problem, it can not directly fly out yet, ensure safe and reliable, avoid appearing the incident.

The rotary driving force of the sphere 4 is realized by the gear transmission between the driving shaft 7 and the sphere 4, so that the action is stable, the purposes of reducing the rotating speed and increasing the torque can be realized, the operation is easier, and meanwhile, the torsional stress borne by the driving shaft 7 when the driving shaft 7 drives the sphere 4 to rotate is reduced, so that the driving shaft 7 cannot break and the service life is long.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The skilled person should understand that: although the invention has been described in terms of the above specific embodiments, the inventive concept is not limited thereto and any modification applying the inventive concept is intended to be included within the scope of the patent claims.