CN104832660A - Bi-directional soft seal butterfly valve opened and closed through screw - Google Patents

Abstract

The invention discloses a two-way soft seal butterfly valve with screw opening and closing, which comprises a hand wheel, a copper nut, a screw, a valve body bracket, a valve body, a valve body sealing seat, a valve plate sealing ring, a valve plate and a valve shaft. When the plate is closed, the plane and the screw are eccentric. The center of the valve plate is fixed with a valve plate rocker. The screw and the valve plate rocker are connected by pin shafts. There are two valve shafts, which are located on both sides of the valve plate and It forms an angle α with the plane of the valve plate in the closed state, one of the valve shafts is above the horizontal central axis of the valve plate, and the other valve shaft is below the horizontal central axis of the valve plate, and the two valve shafts are in the horizontal center of the valve plate in the closed state. The eccentricity between the axes is b. The beneficial effect of the present invention is that the screw is used for opening and closing, the opening and closing time is fast, the opening and closing torque is small, and the opening and closing are obvious. Compared with the processing of the worm gear box, the processing is simple, the production cost is low, and the opening and closing will not be stuck. Can be turned on in place.

Description

A screw opening and closing two-way soft seal butterfly valve

technical field

The invention relates to a butterfly valve, in particular to a screw rod opening and closing bidirectional soft-seal butterfly valve.

Background technique

Butterfly valve, also known as flap valve, is a regulating valve with simple structure, which can be used for switch control of low-pressure pipeline medium. A valve that is closed and closed, the valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It mainly plays the role of cutting and throttling on the pipeline. The opening and closing part of the butterfly valve is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment. It is mainly composed of valve body, valve stem, butterfly plate and sealing ring. The valve body is cylindrical, with a short axial length and a built-in butterfly plate. The butterfly valve is usually less than 90° from fully open to fully closed. The current butterfly valve is generally driven by a worm gear, and the upper and lower shafts and the valve plate are generally connected by taper pins or keys. The valve plate rotates 90 degrees around the upper and lower shafts to open and close the valve. This kind of butterfly valve inevitably has the problems of slow opening and closing time, large opening and closing torque, inconspicuous opening and closing, inability to open in place, complicated processing of the worm gear box, and high production cost.

Contents of the invention

The technical problem to be solved by the present invention is that the existing butterfly valve is driven by a worm gear, the structure is complex, the production cost is high, the valve plate of the butterfly valve cannot be opened in place, the opening and closing time is slow, the opening and closing torque is large, and the opening and closing is not obvious, etc. This provides a screw opening and closing two-way soft-sealed butterfly valve with fast opening and closing time, small opening and closing torque, obvious opening and closing, simple processing and low production cost.

The technical solution of the present invention is: a screw open and close two-way soft seal butterfly valve, which includes a hand wheel, a copper nut, a valve body bracket, a screw, a valve body, a valve body sealing seat, a valve plate sealing ring, a valve plate and a valve shaft, The plane where the valve plate is closed is eccentric to the screw, and the center of the valve plate is fixed with a valve plate rocker, and the screw and the valve plate rocker are connected by pin shafts. There are two valve shafts, which are respectively located on the valve plate On both sides and at an angle α to the plane where the valve plate is in the closed state, one of the valve shafts is located above the horizontal central axis of the valve plate, the other valve shaft is located below the horizontal central axis of the valve plate, and the two valve shafts are in line with the horizontal central axis of the valve plate. The eccentricity between the axes is b.

The improvement of the above solution is that the rocker handle of the valve plate is provided with a waist-shaped groove, and the pin shaft is fitted in the waist-shaped groove. When the screw moves up and down, it drives the pin shaft to move horizontally in the waist-shaped groove.

A further improvement of the above solution is that a cotter pin is inserted into one side of the pin shaft.

A further improvement of the above solution is that the sealing ring of the valve plate is fixed on the valve plate through the pressure plate and the pressure plate screws.

In the above solution, the side of the valve shaft far away from the valve plate is fixedly connected to the end cover through the end cover bolts and the end cover sealing ring, and the valve shaft and the inner wall of the valve are covered with a sleeve, and the valve shaft and the valve The boards are connected by keys.

The sealing seat of the valve body in the above proposal is made of stainless steel, and the sealing ring of the valve plate is made of rubber.

The beneficial effect of the present invention is that the screw is used for opening and closing, the opening and closing time is fast, the opening and closing torque is small, and the opening and closing are obvious. Compared with the processing of the worm gear box, the processing is simple and the production cost is low. The two sides of the valve plate form an angle α with the plane of the valve plate when it is closed, and it will not be stuck when it is opened and closed. Can be turned on in place. There is a waist-shaped groove on the handle of the valve plate, and the pin shaft can move back and forth in the waist-shaped groove, and it will not be stuck during the opening and closing process, which realizes the flexible opening of the valve plate.

Description of drawings

Fig. 1 is a schematic sectional view of the main body of the present invention;

Fig. 2 is a top sectional schematic view of the present invention;

Fig. 3 is a left view schematic diagram of the present invention;

Fig. 4 is a fully opened schematic diagram of the present invention;

Fig. 5 is an enlarged schematic view of the seal in Fig. 2 of the present invention;

In the figure, 1. Hand wheel, 2. Copper nut plate, 3. Press plate bolt, 4. Stop screw, 5. Copper nut, 6 Screw rod, 7. Valve body bracket, 8. Retaining ring, 9. Retaining ring bolt, 10. Seal sleeve O-ring, 11. Seal sleeve, 12. Valve body, 13. Valve body seal seat, 14. Valve plate seal ring, 15. Press plate screw, 16. Press plate, 17. Valve plate, 18, End cover , 19, end cover bolts, 20, end cover O-ring, 21, shaft sleeve, 22, shaft sleeve O-ring, 23, valve shaft, 24, key, 25, cotter pin, 26, pin shaft, 27, valve Plate crank.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1-3 and Figure 5, the present invention includes a hand wheel 1, a copper nut 5, a valve body bracket 7, a screw rod 6, a valve body 12, a valve body sealing seat 13, a valve plate sealing ring 14, and a valve plate 17 and the valve shaft 23, wherein the copper nut is fixed on the valve body bracket through the copper nut pressure plate 2, the copper nut and the copper nut pressure plate are fixed through the pressure plate bolt 3 and the stop screw 4, and the bottom inner wall of the valve body bracket is provided with a stop The ring 8 and the retaining ring bolt 9 valve body support and the valve body can be integrally cast. The valve body bracket below the retaining ring is filled with a sealing sleeve O-ring 10 and a sealing sleeve 11. When the valve plate is closed, the plane and the screw are eccentric. The center of the valve plate is fixed with a valve plate rocker 27. The screw It is connected with the rocker of the valve plate through a pin shaft 26. As shown in Figure 2, there are two valve shafts, which are respectively located on both sides of the valve plate and form an angle α with the plane of the valve plate in the closed state. The size of the angle α can be determined according to Need to set. As shown in Figure 3, one of the valve shafts is located above the horizontal central axis of the valve plate, and the other valve shaft is located below the horizontal central axis of the valve plate. The eccentricity between the two valve shafts and the horizontal central axis of the valve plate in the closed state Both are b, and the size of b can be set as required.

It works as follows:

Valve plate opening: As shown in Figure 4, the hand wheel 1 rotates clockwise, the screw 6 drives the valve plate rocker 27 to move upward through the pin shaft 26, and the valve plate rocker 27 moves upward to drive the valve plate 17 to rotate in the opening direction. The valve plate 17 rotates in the opening direction around the valve shaft 23, and the valve shaft 23 forms an angle α with the plane where the valve plate 17 is in the closed state or the horizontal central axis of the valve plate, which ensures that the valve plate sealing ring 14 is constantly moving when it is opened. In the process of squeezing the sealing seat 13 of the valve body, it will not be stuck. As the screw rod 6 rises, it will gradually open. Since the valve shaft 23 and the horizontal axis of the valve body 12 are eccentric up and down b, it is ensured that the valve plate 17 will not open when it reaches 90 degrees. Collide with the valve shaft 23 on both sides. This has just finished whole valve plate 17 opening process.

Valve plate closing process:

In the same way, the hand wheel 1 rotates counterclockwise, the screw 6 drives the valve plate rocker 27 to move downward through the pin shaft 26, and the valve plate rocker 27 moves downward to drive the valve plate 17 to rotate in the closing direction, and the valve plate 17 rotates around the The valve shaft 23 rotates in the closing direction. Due to the α angle between the valve shaft 23 and the horizontal central axis of the valve plate 17, the sealing ring 14 of the valve plate will not be stuck in the process of squeezing the sealing seat 13 of the valve body when closing. , the valve plate gradually descends along with the screw rod 6 as the pin shaft descends to drive the valve plate rocker to rotate until the valve plate is completely closed, which completes the closing process of the entire valve plate 17.

A preferred example of the present invention is that the rocker handle of the valve plate is provided with a waist-shaped groove, and the pin shaft is fitted in the waist-shaped groove. When the screw moves up and down, the pin shaft is driven to move horizontally in the waist-shaped groove. This avoids the screw being stuck between the rocker of the valve plate during the up and down movement, and the opening is flexible. In order to ensure that the pin shaft moves horizontally and flexibly in the waist-shaped groove, a cotter pin 25 can be inserted on one side of the pin shaft, and the tightness of the pin shaft in the waist-shaped groove can be adjusted as required.

In order to ensure a reliable seal between the valve plate sealing ring and the valve body sealing seat, the valve plate sealing ring can be fixed on the valve plate through the pressure plate 16 and the pressure plate screw 15. The valve plate sealing ring is made of flexible material, preferably rubber, so that the valve There is always a soft seal between the plate sealing ring and the sealing seat of the valve body. The valve plate sealing ring will not cause sealing failure due to long-term friction and wear, and the fixed limit of the pressure plate will not deviate from the position, resulting in sealing failure. The sealing seat of the valve body can be made of stainless steel or other rigid materials, and it and the sealing ring of the valve plate are rigid and flexible to realize reliable sealing.

Specifically, the side of the valve shaft away from the valve plate is affixed with the end cover 18 through the end cover bolt 19 and the end cover sealing ring 20, and the shaft sleeve 21 is covered between the valve shaft and the inner wall of the valve, and the sleeve and the valve A shaft sleeve O-ring 22 is arranged between the shafts, and the valve shaft and the valve plate are connected by a key 24 .

Claims (6)

1. a screw rod opening and closing two-way soft seal butterfly valve, it comprises handwheel, copper nut, screw rod, valve body support, valve body, valve body sealing seat, valve plate sealing ring, valve plate and valve shaft, it is characterized in that described When the valve plate is closed, the plane and the screw are eccentric. The center of the valve plate is fixed with a valve plate rocker. The screw and the valve plate rocker are connected by a pin shaft. There are two valve shafts, which are located on both sides of the valve plate. And it forms an angle α with the plane of the valve plate in the closed state, one of the valve shafts is located above the horizontal central axis of the valve plate, and the other valve shaft is located below the horizontal central axis of the valve plate, and the two valve shafts are horizontal to the closed state of the valve plate The eccentricity between the central axes is b. 2. A two-way soft-sealed butterfly valve with screw opening and closing as claimed in claim 1, characterized in that the handle of the valve plate is provided with a waist-shaped groove, and the pin shaft is fitted in the waist-shaped groove, when the screw rod goes up and down When moving, the pin shaft is driven to move horizontally in the waist-shaped groove. 3. A screw open-close two-way soft-sealed butterfly valve as claimed in claim 2, characterized in that a cotter pin is plugged into one side of the pin shaft. 4. A screw open-close two-way soft-sealed butterfly valve as claimed in claim 3, characterized in that the sealing ring of the valve plate is fixed on the valve plate through the pressure plate and the pressure plate screws. 5. A screw open-close two-way soft-sealed butterfly valve as claimed in claim 4, characterized in that the side of the valve shaft far away from the valve plate is fixedly connected with an end cover through an end cover bolt and an end cover sealing ring, and the valve A shaft sleeve is covered between the shaft and the inner wall of the valve, and the valve shaft and the valve plate are connected by a key. 6. A screw open-close two-way soft-sealed butterfly valve as claimed in any one of claims 1-5, characterized in that the sealing seat of the valve body is made of stainless steel, and the sealing ring of the valve plate is made of rubber.