WO2009100648A1

WO2009100648A1 - A hard sealing ball valve having non-wearing sealing surface

Info

Publication number: WO2009100648A1
Application number: PCT/CN2009/000123
Authority: WO
Inventors: Xiaofeng Zhu
Original assignee: Xiaofeng Zhu
Priority date: 2008-02-05
Filing date: 2009-02-02
Publication date: 2009-08-20

Abstract

A hard sealing ball valve having non-wearing sealing surface, said valve includes a valve body (3), a left valve cover (1) and a right valve cover (2), a left valve seat (7) and a right valve seat (8),a valve ball (4) and a valve rod (5),said valve ball (4) with a through-hole is provided in said valve body (3), the up end of the valve ball(4) connects the valve rod (5) by a actuating mechanism (6), a guide pin (13) is provided on the down end of the valve ball (4), said left and right valve covers (1, 2) with fluid passage are respectively provided on two sides of the valve body (3), the left and right valve seats (7, 8) are respectively arranged in left and right valve covers (1, 2), and are arranged on two sides of the valve ball (4), a valve seat spring (9, 10) is respectively mounted on an outer end of a valve seat (7, 8). A sealing circle (11, 12) is arranged between the valve seat (7, 8) and a valve cover (1, 2). A left valve cover (1) and a right valve cover (2) are set with a supporting surface (22, 23) in contact with a valve ball(4) surface. A surface of the valve ball (4) is arranged with a spiral tooth groove (17, 14) and a sealing surface (18, 15) is sunk into the valve ball (4) surface. End surfaces of left and right valve seats (7, 8) are respectively arranged with a corresponding spiral tooth groove (19, 16) and a sealing surface (21, 20) sunk into the end surface of the valve seat (4).

Description

Sealed surface without wear hard seal ball valve

Technical field

The invention relates to a valve, in particular to a sealing surface wear-free hard seal ball valve.

Background technique

At present, ball valves have been widely used in petroleum, chemical, electric power, metallurgy, papermaking and other industries. The traditional ball valve generally adopts a soft seal. Due to the restriction of the sealing material, it has a small temperature range, low temperature resistance, high pressure and corrosion resistance, and short service life. It is required to use a high-parameter, high-performance ball valve as the opening and closing member. Special working conditions, such as: pulp, ash, dust, etc., can not be met, so the use of hard-sealed ball valves. The current hard seal ball valve usually consists of a valve body, a valve cover, a valve ball, a valve seat and a valve stem. When used, the valve ball of the lower end is rotated by rotating the valve stem, so that the through hole on the valve ball and the flow path of the valve are Corresponding or staggered to achieve opening or closing of the ball valve. Because the valve ball is rubbed against the valve seat during the rotation process, the wear is serious, which is easy to cause leakage, which reduces the working reliability of the ball valve and shortens the service life of the ball valve. Although there are currently no wear-resistant ball valves, the structure is more complicated, and it is not convenient to use and maintain.

Summary of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a wear-free hard-sealing ball valve with a reasonable structure, no wear between the sealing surface of the valve ball and the sealing surface of the valve seat, long service life, convenient use and maintenance, and High temperature resistance, high pressure and good sealing performance.

The technical solution adopted by the invention to solve the technical problem thereof comprises: a valve body, a valve cover, a valve seat, a valve ball and a valve stem, a valve ball with a through hole in the valve body, an upper end of the valve ball and a valve stem and a valve stem valve The ball transmission mechanism is connected, the lower end of the valve ball is provided with a guide pin, the left and right valve covers with flow passages are arranged on both sides of the valve body; the left and right valve seats are respectively installed in the left and right valve covers, and the valve ball is respectively On both sides, the outer end of the valve seat is provided with a valve seat spring, and a sealing ring is arranged between the valve seat and the valve cover; the left and right valve covers are respectively provided with a supporting surface which is in contact with the surface of the valve ball; and the feature is: The surface is provided with a spiral tooth groove and a sealing surface recessed into the surface of the valve ball, and the end faces of the left and right valve seats are respectively provided with corresponding spiral tooth grooves and sealing faces recessed into the valve seat end faces. The above-mentioned valve stem wide-gear transmission mechanism composed of an outer valve stem, a cam and a semi-circular gear, the lower end of the valve stem is sleeved in the outer valve stem, the valve stem is provided with a valve stem flat key, and the outer valve stem is provided with an outer valve The flat button of the rod has a cam and a semi-circular gear at the lower end of the valve rod, and the lower end of the cam is in contact with the curved surface of the upper end of the rotatable semi-circular gear, and the semi-circular gear meshes with the transmission tooth at the upper end of the valve ball.

The spiral grooves on the surface of the valve ball and the valve seat are both annular continuous spiral grooves.

The above sealing ring is a metal bellows type or a metal ring type sealing ring. .

A sewage through hole is provided at a groove bottom of the spiral groove of the valve ball.

The groove depth of the spiral groove on the valve seat and the valve ball is more than twice the depth of the sealing surface of the valve ball and the sealing surface of the valve seat. This ensures that the ball valve sealing surface and the valve seat sealing surface are completely fitted during the opening and closing process of the ball valve to achieve the desired sealing effect.

The structure of the invention is reasonable, and the sealing surface of the ball valve is prevented from being worn during the opening and closing process, thereby improving the working reliability of the ball valve, prolonging the service life of the ball valve, and high temperature resistance, high pressure and good sealing performance.

DRAWINGS

Figure 1 is a schematic structural view of the present invention;

2 is a schematic structural view showing a state in which a spiral groove of a valve ball and a valve seat are screwed in and a sealing surface is fitted in the present invention;

Figure 3 is a schematic structural view of a valve ball in the present invention;

Figure 4 is a left side view of Figure 3;

Figure 5 is a schematic exploded view of the helical gullet of Figure 4;

Figure 6 is a schematic structural view of a right valve seat in the present invention;

Figure 7 is a left side view of Figure 6;

Figure 8 is a schematic view showing the spiral groove of Figure 7;

Figure 9 is a schematic view showing the structure of the valve stem ball transmission mechanism of the present invention.

In the figure: 1 is the left bonnet, 2 is the right bonnet, 3 is the valve body, 4 is the valve ball, 5 is the valve stem, 6 is the valve stem ball transmission mechanism, 7 is the left valve seat, 8 is the right valve seat , 9 and 10 are seat springs, 11 And 12 is the sealing ring, 13 is the guiding pin, 14 and 17 are the valve ball helical groove, 18 and 15 are the valve ball sealing surface, 19 is the left seat spiral groove, 16 is the right seat spiral groove, 20 is Right seat sealing surface, 21 is left seat sealing surface, 22 is right bonnet support surface, 23 is left bonnet support surface, 24 is transmission gear, 25 is guide groove, 26 is valve stem cam, 27 is valve stem The flat key, 28 is the outer valve stem, 29 is the outer valve stem flat key, and 30 is the semicircular gear.

detailed description

The invention will be further described in detail below with reference to the accompanying drawings.

The invention comprises a valve body 3, a valve cover 1, 2, a valve seat 7, 8, a valve ball 4 and a valve stem 5, a valve ball 4 having a through hole in the valve body 3, and a valve stem 5 at the upper end of the valve ball 4 And the valve stem ball transmission mechanism 6, the lower end of the valve ball 4 is provided with a guiding groove 25, and the guiding groove 25 is provided with a guiding pin 13; the valve body 3 is provided with left and right valve covers 1 with flow paths on both sides thereof 2, left and right seat 7, 8 are installed on the left and right bonnet

I, 2, and located on both sides of the valve ball 4, the left and right valve seats 7, 8 are equipped with valve seat springs 9, 10, left valve seat 7 and left valve cover 1, right valve seat 8 and right O-rings are provided between the bonnets 2

II, 12; The above O-rings 11, 12 are metal bellows type (or metal ring type) sealing rings. The left and right bonnets 1, 2 are provided with support surfaces 23, 22 which are in contact with the surface of the valve ball 4; the surface of the wide ball 4 is provided with helical gullets 17, 14 and a sealing surface 18 recessed into the surface of the valve ball 4, 15, the end faces of the left and right valve seats 7, 8 are respectively provided with corresponding spiral grooves 19, 16 and sealing faces 21, 20 recessed into the left and right valve seats 7, 8. The spiral grooves 19, 17, 14, 16 of the valve ball 4 and the left and right valve seats 7, 8 are annular continuous spiral grooves, that is, N degrees on one surface circumference of the valve ball 4. Divided into a plurality of helical slots 17 (shown in Figure 4), wherein AB, DE are the helical faces of the helical slots 17, and BC EF is the addendum of the helical slots 17, that is, the surface of the ball

(As shown in Fig. 5); Similarly, on the circumference of the end face of the right valve seat 8, the surface corresponding to the valve ball 4 is equally divided into a plurality of helical slots 16 (as shown in Fig. 7), wherein A'-B',D'-E' is the helicoid of the helical gullet. 16, B'-C: ', E'-F' is the crest of the helical gullet 16 (as shown in Figure 8). The valve stem ball transmission mechanism 6 is mainly composed of an outer valve stem 28, a valve stem cam 26, and a semi-circular gear 30. The valve stem ball transmission mechanism 6 can also adopt an existing gear transmission mechanism and a concave cam transmission. The movable mechanism, the worm gear transmission mechanism and the lever type transmission mechanism), the lower end of the valve stem 5 is sleeved in the outer valve stem 28, the valve stem 5 is provided with a valve stem flat key 27, and the outer valve stem 28 is provided There is an outer valve stem flat key 29, when the valve stem 5 is rotated to press the valve flat key 27 to the outer valve stem flat key 29, the external valve stem 28 also rotates due to the action of the outer stem flat key 29. . The lower end of the valve stem 5 is provided with a valve stem cam 26 and a semicircular gear 30, and the lower end of the valve stem cam 26 is in contact with the curved surface of the upper end of the rotatable semicircular gear 30, and the semicircular gear 30 meshes with the transmission teeth 24 at the upper end of the valve ball 4. Sewage through holes are provided in the groove bottoms of the valve ball helical gullets 14, 17 to remove dirt. The groove depths L of the left and right valve seats 7, 8 and the spiral grooves 19, 17, 14, 16 on the surface of the valve ball 4 are the ball sealing faces 18, 15, and the left and right seat sealing faces 21, 20 are recessed. The depth L is more than 2 times. This ensures that during the opening and closing of the ball valve, the ball sealing faces 18 and 15 are completely fitted to the left and right seat sealing faces 21 and 20, respectively, to achieve the desired sealing effect.

When the ball valve is opened, the valve stem 5 is rotated, and under the action of the valve rod cam 26, the semicircular gear 30 is rotated by the valve ball transmission tooth 24 to rotate the valve ball 4 in the direction of the spiral groove (0:: spiral direction) by a certain angle, and will be left. The valve seat helical gullet 19 and the right valve seat helical gullet 16 are rotated out of the valve ball helical gullets 17, 14, so that the left seat sealing surface 21, the right valve seat sealing 20 and the valve ball sealing surfaces 18, 15 are unscrewed, The valve stem flat key 27 and the outer valve stem flat key 29 are locked, and the valve stem 5 is continuously rotated to drive the outer valve stem 28 to rotate the valve ball 4 by 90° in the valve flow path direction to open the valve. When the ball valve is closed, the valve stem 5 is rotated in the opposite direction, and under the action of the valve rod cam 26, the semicircular gear 30 is rotated by the valve ball transmission tooth 24 in the direction of the spiral groove (ie, the spiral direction) by a certain angle. At the same time, the wide-bar flat key 27 and the outer valve stem flat key 29 are reversely locked, and the rotation of the valve stem 5 is continued to drive the outer valve stem 28 to rotate the valve ball 4 by 90° in the valve flow path direction, at the valve seat springs 9, 10 Under the action, the left seat spiral groove 19 and the right seat spiral groove 16 are screwed into the ball spiral groove 17, 14, so that the ball sealing faces 18, 15 and the left seat sealing surface 21, the right seat sealing surface 20 turns, reaching the valve closed. During the rotation of the valve ball 4, the sealing surfaces of the valve ball and the valve chamber are always in a non-contact state. Therefore, the sealing surface of the valve ball and the valve seat does not cause wear, which can effectively ensure the service life of the valve, and is an updated product of the ordinary hard seal ball valve.

Claims

Rights request

1. Sealed surface non-wearing hard seal ball valve, including valve body, valve cover, valve seat, valve ball and valve stem, valve body with through hole in valve body, upper end of valve ball and valve stem and valve stem ball transmission mechanism Connected, the lower end of the valve ball is equipped with a guide pin, and the left and right valve covers with flow passages are arranged on both sides of the valve body; the left and right valve seats are respectively installed in the left and right valve covers and on both sides of the valve ball. The outer end of the valve seat is provided with a valve seat spring, and a sealing ring is arranged between the valve seat and the valve cover; the left and right valve covers are respectively provided with a supporting surface in contact with the surface of the valve ball; the feature is: the surface of the valve ball is set The spiral tooth groove and the sealing surface of the concave valve ball surface are respectively provided with corresponding spiral groove and sealing surface of the concave valve seat end face on the end faces of the left and right valve seats.

2. The sealing surface wear-free hard seal ball valve according to claim 1, wherein: the valve stem ball transmission mechanism composed of the outer valve stem, the cam and the semicircular gear, and the lower end of the valve stem are sleeved on the outer valve Inside the rod, the valve stem is provided with a valve stem flat key, the outer valve stem is provided with an outer valve stem flat key, the lower end of the valve stem is provided with a cam and a semicircular gear, and the lower end of the cam is in contact with the upper end surface of the rotatable semicircular gear The semicircular gear meshes with the drive teeth at the upper end of the valve ball.

3. The seal face wear-free hard seal ball valve according to claim 1, wherein: the valve ball and the spiral groove on the valve seat are both annular continuous spiral slots.

4. The seal face wear-free hard seal ball width according to claim 1, wherein the seal ring is a metal bellows type or a metal ring type seal ring.

The sealing surface wear-free hard seal ball valve according to claim 1 or 3, characterized in that: a fouling through hole is provided in the groove bottom of the valve ball spiral tooth groove.

6. The sealing surface wear-free hard seal ball valve according to claim 1, wherein: the groove depth of the spiral groove on the valve seat and the valve ball is a depth of the valve ball sealing surface and the sealing surface of the valve seat sealing surface. More than double.

7. The sealing surface wear-free hard seal ball valve according to claim 1 or 2, wherein: the valve stem ball transmission mechanism is a gear type transmission mechanism, a concave cam type transmission mechanism, a worm wheel type transmission mechanism, and a lever type transmission mechanism. One of them.