CN106321867A - Multilayerbidirectional hard sealing butterfly valve - Google Patents

Abstract

The invention discloses a multilayerbidirectional hard sealing butterfly valve which comprises a valve body and a valve plate. A flow cavity is formed in the valve body. A valve shaft penetrates into the valve plate. The upper end of the valve shaft is connected with the upper end of the valve body through an upper shaft sleeve. The lower end of the valve shaft is connected to the lower end of the valve body through a lower shaft sleeve. A support is arranged at the upper portion of the valve body. A drive worm wheel mechanism is connected to the support. The upper end of the valve shaft is connected with the drive worm wheel mechanism. The outer wall of the valve plate is connected with a seal ring through a press plate. A movable valve seat is connected in the flow cavity through an O-shaped ring. When the valve plate and the flow cavity are in a closed state, the seal ring is connected with the movable valve seat. During action, the drive worm wheel mechanism drives the valve shaft to rotate and further drives the valve plate to rotate so as to achieve opening and closing of the flow cavity. The multilayerbidirectional hard sealing butterfly valve is simple in structure, good in sealing performance and long in service life.

Description

A multi-layer two-way hard-sealed butterfly valve

technical field

The invention relates to the field of valves, in particular to a multi-layer bidirectional hard-sealed butterfly valve.

Background technique

At present, butterfly valves are widely used in all walks of life, and the requirements are getting higher and higher to achieve two-way sealing and hard-to-hard sealing. The existing butterfly valves cannot achieve zero leakage of reverse sealing, which has troubled pipeline workers in some industries.

Butterfly valve refers to a valve in which the valve plate rotates around the valve stem to achieve opening and closing. It mainly plays the role of cutting and throttling on the pipeline. Butterfly valves have two sealing forms: elastic soft seal and metal hard seal. Metal hard seal valves generally have a longer service life than soft seal valves and can be used in high temperature working environments, but the sealing performance is not as good as soft seal valves.

Contents of the invention

The object of the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a simple and practical multi-layer two-way hard-sealed butterfly valve.

The present invention is achieved in the following manner:

A multi-layer two-way hard-sealed butterfly valve is characterized in that it includes a valve body 14 and a valve plate 12, and the valve body 14 is provided with a flow chamber 141; the valve plate 12 is provided with a valve shaft 11; The plate 12 is located in the flow chamber 141; the upper end of the valve shaft 11 is connected to the upper end of the valve body 14 through the upper sleeve 15; the lower end of the valve shaft 11 is connected to the lower end of the valve body 14 through the lower sleeve 4; The valve shaft 11 is rotatable relative to the valve body 14; the upper part of the valve body 14 is provided with a bracket 21; the bracket 21 is connected with a transmission worm gear mechanism 25; the upper end of the valve shaft 11 is connected with the transmission worm gear mechanism 25 ;

The outer wall of the valve plate 12 is connected with the sealing ring 7 through the pressure plate 9; the movable valve seat 6 is connected with the O-ring 5 in the flow cavity 141; when the valve plate 12 and the flow cavity 141 are in a closed state, the sealing ring 7 It is connected with the movable valve seat 6; when in action, the transmission worm gear mechanism 25 drives the valve shaft 11 to rotate, and then drives the valve plate 12 to rotate, so as to realize the opening and closing of the flow chamber 141.

The movable valve seat 6 is provided with a valve seat slope 61, and the sealing ring 7 is in contact with the valve seat slope 61; the valve seat slope 61 forms an angle deviation angle α with the vertical line; the center line of the sealing ring 7 An axial eccentricity E is formed between the horizontal line of the valve shaft 11 and a radial eccentricity e between the centerline of the valve plate 12 and the vertical centerline of the valve shaft 11 .

A packing pad 16 and a packing gland 18 are sleeved on the valve shaft 11 , the packing gland 18 is located above the packing pad 16 , and a packing 17 is provided between the packing gland 18 and the packing pad 16 .

The lower end of the valve shaft 11 is connected to the valve body 6 through the split ring 3; the lower end of the valve body 14 is connected to the bottom cover 1 through the lower sealing ring 2; the bottom cover 1 is located below the valve shaft 11.

The invention has the beneficial effects of simple structure, convenient operation, long service life and reliable sealing performance.

Description of drawings

Fig. 1 front view of structure of the present invention;

Fig. 2 is a top view of the structure of the present invention.

detailed description

Now in conjunction with accompanying drawing, describe the specific embodiment of the present invention in detail:

As shown in Figure 1, a multi-layer two-way hard-sealed butterfly valve includes a valve body 14 and a valve plate 12. The valve body 14 is provided with a flow chamber 141; the valve plate 12 is pierced with a valve shaft 11; In the cavity 141; the upper end of the valve shaft 11 is connected with the upper end of the valve body 14 through the upper shaft sleeve 15; the lower end of the valve shaft 11 is connected with the lower end of the valve body 14 through the lower shaft sleeve 4; Rotation; the upper part of the valve body 14 is provided with a bracket 21; the bracket 21 is connected with a transmission worm gear mechanism 25; the upper end of the valve shaft 11 is connected with the transmission worm gear mechanism 25; the outer wall of the valve plate 12 is connected with a sealing ring 7 through the pressure plate 9; The cavity 141 is connected with the movable valve seat 6 through the O-ring 5; when the valve plate 12 and the flow chamber 141 are closed, the sealing ring 7 is in contact with the movable valve seat 6; when in motion, the driving worm gear mechanism 25 drives the valve shaft 11 The rotation drives the valve plate 12 to rotate to realize the opening and closing of the flow chamber 141 .

As shown in Figure 2, the movable valve seat 6 is provided with a valve seat slope 61, and the sealing ring 7 is in contact with the valve seat slope 61; the valve seat slope 61 forms an angle deviation angle α with the vertical line; the center line of the sealing ring 7 is in line with the valve The axial eccentricity E is formed between the horizontal lines of the shaft 11; the radial eccentricity e is formed between the centerline of the valve plate 12 and the vertical centerline of the valve shaft 11.

A packing pad 16 and a packing gland 18 are sleeved on the valve shaft 11 of the present invention, the packing gland 18 is located above the packing pad 16, and a packing 17 is arranged between the packing gland 18 and the packing pad 16 to increase the sealing performance.

The lower end of the valve shaft 11 of the present invention is connected to the valve body 6 through the split ring 3; the lower end of the valve body 14 is connected with the bottom cover 1 through the lower sealing ring 2;

The present invention adopts three eccentric structures, that is, the axial eccentricity E, the radial eccentricity e and the angle deviation angle α, which greatly reduces the friction of the sealing surface, and the axial eccentricity E and the radial eccentricity e are jointly combined to form Form, when the valve plate 12 is closed, it forms a tighter and tighter action, which is conducive to sealing; the radial eccentricity e also plays the role of instant opening and separation, and the center of the sealing surface formed by the sealing ring 7 and the valve seat slope 61 Offset from the center of the valve body 14 by an angular deviation angle α, thereby producing a valve plate 12 with a long axis and a short axis, the sealing surface rotation track of the valve plate 12 forms a wedge angle θ1 and the valve seat slope 61 of the movable valve seat 6 θ2, so that the sealing surface of the valve plate 12 is gradually separated from and gradually pressed against the valve seat slope 61, thereby completely eliminating the mechanical wear and scratches between the two sealing pairs of the valve plate when the valve plate 12 is opened and closed; the movable valve seat 6 is formed by The original fixed type is changed to a movable type. Under the action of the reverse pressure, the pressure can give the movable valve seat 6 a thrust, so that the movable valve seat 6 is close to the sealing surface of the valve plate 12, and the necessary sealing ratio of the reverse seal is reached. Pressure, so as to realize the two-way sealing of the valve.

When working, the hand wheel rotates counterclockwise to drive the worm gear mechanism 25 to drive the valve shaft 11, and the valve plate 12 fixed on the valve shaft 11 rotates accordingly, so that the sealing ring 7 fixed on the valve plate 12 is slowly separated from the movable valve seat 6, The large plane of the valve plate 12 is parallel to the water flow direction, that is, the valve is in the open state; otherwise, when the sealing ring 7 on the valve plate 12 is placed close to the movable valve seat 6 in the inner cavity of the valve body 14, the valve is in the closed state.

Claims (3)

1. A multi-layer two-way hard-sealed butterfly valve is characterized in that: comprise valve body (14), valve plate (12), described valve body (14) is provided with flow chamber (141); Described valve plate (12) ) is provided with a valve shaft (11); the valve plate (12) is located in the flow cavity (141); the upper end of the valve shaft (11) passes through the upper shaft sleeve (15) and the upper end of the valve body (14) connected; the lower end of the valve shaft (11) is connected to the lower end of the valve body (14) through the lower bushing (4); the valve shaft (11) is rotatable relative to the valve body (14); the valve body (14) The upper part is provided with a bracket (21); the bracket (21) is connected with a transmission worm gear mechanism (25); the upper end of the valve shaft (11) is connected with the transmission worm gear mechanism (25); The movable valve seat (6) is provided with a valve seat slope (61), and the sealing ring (7) is in contact with the valve seat slope (61); the valve seat slope (61) forms an angle deviation angle with the vertical line (α); the axial eccentricity (E) is formed between the center line of the sealing ring (7) and the horizontal line of the valve shaft (11); the center line of the valve plate (12) and the valve shaft (11) The radial eccentricity (e) is formed between the vertical center lines; The outer wall of the valve plate (12) is connected with a sealing ring (7) through the pressure plate (9); the movable valve seat (6) is connected with the O-ring (5) in the flow cavity (141); when the valve plate ( 12) When the flow cavity (141) is closed, the sealing ring (7) is in contact with the movable valve seat (6); when in motion, the transmission worm gear mechanism (25) drives the valve shaft (11) to rotate, and then drives the valve plate ( 12) Rotate to realize the opening and closing of the flow cavity (141); The three-eccentric structure is adopted, namely axial eccentricity (E), radial eccentricity (e) and angular deviation angle (α), which greatly reduces the friction of the sealing surface, axial eccentricity (E) and radial eccentricity ( e) Combined into the form of eccentric shafts, the valve plate (12) forms an action of getting tighter and tighter when closing, which is beneficial to sealing; the radial eccentricity (e) also plays the role of opening and leaving, sealing The center of the sealing surface formed by the ring (7) and the valve seat slope (61) is offset by an angular deviation angle (α) from the center of the valve body (14), thereby producing a valve plate (12) with a long axis and a short axis, and the valve plate The rotation track of the sealing surface of (12) forms a wedge angle (θ1) and (θ2) with the valve seat slope (61) of the movable valve seat (6), so that the sealing surface of the valve plate (12) gradually detachment and gradual compression, so as to completely eliminate the mechanical wear and scratches between the two sealing pairs of the valve plate (12) when the valve plate (12) is opened and closed; the movable valve seat (6) is changed from the original fixed type to the movable type, Under the action of the reverse pressure, the pressure can give the movable valve seat (6) a thrust, making the movable valve seat (6) close to the sealing surface of the valve plate (12) to achieve the necessary sealing specific pressure for reverse sealing, thereby realizing Two-way sealing of the valve. 2. A multi-layer two-way hard-sealed butterfly valve according to claim 1, characterized in that: a packing pad (16) and a packing gland (18) are sleeved on the valve shaft (11), and the packing gland (18) is sleeved on the valve shaft (11). The cover (18) is located above the packing pad (16), and packing (17) is arranged between the packing gland (18) and the packing pad (16). 3. A multi-layer two-way hard-sealed butterfly valve according to claim 1, characterized in that: the lower end of the valve shaft (11) is connected to the valve body (6) through a split ring (3); The lower end of the body (14) is connected with a bottom cover (1) through a lower sealing ring (2); the bottom cover (1) is located below the valve shaft (11).