Four-eccentric hard sealing butterfly valve

Abstract

The utility model relates to a four-eccentric hard sealing butterfly valve which comprises a butterfly plate, a valve rod and a valve body, one plate face of the butterfly plate is fixedly connected with the valve rod, the valve rod is rotatably connected with the valve body, a valve seat is fixedly connected in the valve body, and the outer edge face of the butterfly plate is in contact with the inner edge face of the valve seat. The taper of the outer edge face of the butterfly plate is matched with the taper of the inner edge face of the valve seat, the butterfly plate is fixedly connected with a movable sealing plate on the plate face of one side of the valve rod, the valve seat is fixedly connected with a fixed sealing plate on the other side of the valve rod, when the butterfly plate is closed, the movable sealing plate abuts against the valve seat, and the butterfly plate abuts against the fixed sealing plate. According to the four-eccentric hard sealing butterfly valve, the movable sealing plate on the butterfly plate and the fixed sealing plate on the valve seat are used for increasing the sealing contact area of the butterfly plate and the valve seat, the sealing effect is improved, meanwhile, the pressed area of the forward butterfly plate is increased, and the forward sealing effect is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to a four eccentric butterfly valve, especially a four eccentric hard sealing butterfly valve. BACKGROUND

[0002] The butterfly valve is also called a flap valve, and it is a simple structure regulating valve, which can be used for on-off control of low-pressure pipeline medium, and the butterfly valve refers to a disc-shaped closing part (valve disc or butterfly plate), which rotates around a valve shaft to achieve opening and closing, and the butterfly valve can be used for controlling air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media and various types of fluids, and mainly plays a role of cutting off and throttling on the pipeline.

[0003] The four eccentric butterfly valve has an intersection line between the conical contact surface of the butterfly plate and the valve seat and the center line of the valve plate, and the intersection line has an angle with the center line, so that the four eccentric butterfly valve has superior bidirectional sealing performance, and no matter the medium flows forward or reversely, a good seal can be formed, and when the four eccentric butterfly valve is used in a high-temperature, high-pressure and corrosive environment, the sealing contact surface of the hard seal is small, and the sealing effect is poor. UTILITY MODEL CONTENT

[0004] The utility model discloses a four eccentric hard sealing butterfly valve, which is used to solve the problem that the sealing contact surface of the hard seal of the existing four eccentric hard sealing butterfly valve is small and the sealing effect is poor when the four eccentric hard sealing butterfly valve is used in a high-temperature, high-pressure and corrosive environment.

[0005] In order to solve the above problems, the utility model provides a four eccentric hard sealing butterfly valve, which comprises a butterfly plate, a valve rod and a valve body, one plate surface of the butterfly plate is fixedly connected with the valve rod, the valve rod is rotationally connected with the valve body, a valve seat is fixedly connected in the valve body, the outer edge surface of the butterfly plate is in contact with the inner edge surface of the valve seat, the taper of the outer edge surface of the butterfly plate is matched with the taper of the inner edge surface of the valve seat, a movable sealing plate is fixedly connected on the plate surface of the butterfly plate on one side of the valve rod, a fixed sealing plate is fixedly connected on the other side of the valve rod, the movable sealing plate abuts against the valve seat when the butterfly plate is closed, and the butterfly plate abuts against the fixed sealing plate.

[0006] The four eccentric hard sealing butterfly valve provided by the utility model also has the following technical features:

[0007] Further, a worm wheel box is fixedly connected on the valve body, a worm wheel and a worm are rotationally arranged in the worm wheel box and are in meshing connection with each other, the center of the worm wheel is fixedly connected with the valve rod, and the worm is provided with an input shaft which extends out of the worm wheel box.

[0008] Further, the movable sealing plate and the fixed sealing plate are respectively bolted on the butterfly plate and the valve seat.

[0009] Further, the movable sealing plate and the fixed sealing plate are rotationally connected with the valve rod.

[0010] Further, the taper of the inner edge surface of the valve seat at the fixed sealing plate connecting position is greater than the taper of the inner edge surface of the valve seat at the movable sealing plate connecting position.

[0011] Further, a reinforcing rib is fixedly connected to the valve rod, and the reinforcing rib is fixedly connected to the butterfly plate.

[0012] Further, the contact surfaces between the butterfly plate and the fixed sealing plate and between the movable sealing plate and the valve seat are provided with mutually engaging sealing grooves.

[0013] The four-eccentric hard sealing butterfly valve has the following beneficial effects: the four-eccentric hard sealing butterfly valve increases the sealing contact area of the butterfly plate and the valve seat by using the movable sealing plate on the butterfly plate and the fixed sealing plate on the valve seat, improves the sealing effect, and increases the pressure receiving area of the forward butterfly plate, so that the forward sealing effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 Fig. 4 is an axial view of the four-eccentric hard sealing butterfly valve of the embodiment of the present application;

[0015] Figure 2 Fig. 5 is a top view of the four-eccentric hard sealing butterfly valve in an open state of the embodiment of the present application;

[0016] Figure 3 Fig. 6 is a top view of the four-eccentric hard sealing butterfly valve in a closed state of the embodiment of the present application;

[0017] Figure 4 Fig. 7 is a top view of the worm gear box of the four-eccentric hard sealing butterfly valve of the embodiment of the present application.

[0018] (1-butterfly plate, 2-valve rod, 3-valve body, 4-valve seat, 5-movable sealing plate, 6-fixed sealing plate, 7-worm gear box, 8-worm wheel, 9-worm, 10-input shaft, 11-reinforcing rib) DETAILED DESCRIPTION

[0019] The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0020] As Figures 1 to 4In the embodiment of the four-eccentric hard sealing butterfly valve shown in the utility model, the four-eccentric hard sealing butterfly valve comprises a disc 1, a valve rod 2 and a valve body 3, one plate surface of the disc 1 is fixedly connected with the valve rod 2, the valve rod 2 is rotationally connected with the valve body 3, a valve seat 4 is fixedly connected in the valve body 3, the outer edge surface of the disc 1 is in contact with the inner edge surface of the valve seat 4, the taper of the outer edge surface of the disc 1 is matched with the taper of the inner edge surface of the valve seat 4, a movable sealing plate 5 is fixedly connected on the plate surface of the disc 1 on one side of the valve rod 2, a fixed sealing plate 6 is fixedly connected with the valve seat 4 on the other side of the valve rod 2, the movable sealing plate 5 is abutted on the valve seat 4 when the disc 1 is closed, and the disc 1 is abutted on the fixed sealing plate 6.

[0021] Specifically, the valve rod 2 is rotated to drive the disc 1 to rotate, the disc 1 on one side of the valve rod 2 is separated from the fixed sealing plate 6 on the valve seat 4, and the movable sealing plate 5 on the other side is separated from the valve seat 4 along with the disc 1, and the valve is opened; when the valve is closed, the valve rod 2 is rotated to make the movable sealing plate 5 abut and be extruded tightly with the valve seat 4, make the edge of the disc 1 abut and be in contact with the taper surface of the inner edge of the valve seat 4, and make the disc 1 abut with the fixed sealing plate 6 of the valve seat 4; the movable sealing plate 5 and the fixed sealing plate 6 increase the contact surface area of the disc 1 and the valve seat 4, and the movable sealing plate 5 increases the pressure area in the positive direction, so that the disc 1 extrudes the tapered contact surface of the valve seat 4, the disc 1 and the valve seat 4 are extruded more tightly, and the sealing effect is better.

[0022] In an embodiment of the present application, preferably, a worm gear box 7 is fixedly connected on the valve body 3, a worm wheel 8 and a worm 9 are rotationally arranged in the worm gear box 7 and are in mesh with each other, the center of the worm wheel 8 is fixedly connected with the valve rod 2, the worm 9 is provided with an input shaft 10 extending out of the worm gear box 7 and is used for driving the valve rod 2 to rotate.

[0023] In an embodiment of the present application, preferably, the movable sealing plate 5 and the fixed sealing plate 6 are bolted on the disc 1 and the valve seat 4 respectively, so that the movable sealing plate 5 and the fixed sealing plate 6 are convenient to replace.

[0024] In an embodiment of the present application, preferably, the movable sealing plate 5 and the fixed sealing plate 6 are rotationally connected with the valve rod 2, so that the movable sealing plate 5 rotates more smoothly along with the disc 1, and the fixed sealing plate 6 can better completely seal the contact surface of the disc 1 and the valve seat 4.

[0025] In an embodiment of the present application, preferably, the taper of the inner edge surface of the valve seat 4 at the connection position of the fixed sealing plate 6 is greater than the taper of the inner edge surface of the valve seat 4 at the connection position of the movable sealing plate 5, so that the disc 1 rotates smoothly, and the movable sealing plate 5 and the valve seat 4 are prevented from being jammed. Figure 2 、 Figure 3 In an embodiment of the present application, preferably, the taper of the inner edge surface of the valve seat 4 at the connection position of the fixed sealing plate 6 is greater than the taper of the inner edge surface of the valve seat 4 at the connection position of the movable sealing plate 5, so that the disc 1 rotates smoothly, and the movable sealing plate 5 and the valve seat 4 are prevented from being jammed.

[0026] In one embodiment of the present application, preferably, the valve rod 2 is fixedly connected with a reinforcing rib 11, and the reinforcing rib 11 is fixedly connected with the butterfly plate 1, so that the valve rod 2 can drive the butterfly plate 1 to rotate.

[0027] In one embodiment of the present application, preferably, the contact surfaces between the butterfly plate 1 and the fixed sealing plate 6 and the movable sealing plate 5 and the valve seat 4 are provided with mutually interlocked sealing grooves (not shown in the drawings), so as to increase the contact area and improve the sealing effect.

[0028] In summary, in the four-eccentric hard sealing butterfly valve of the above-mentioned embodiments of the present application, specifically, the rotary valve rod 2 drives the butterfly plate 1 to rotate, the butterfly plate 1 on one side of the valve rod 2 is separated from the fixed sealing plate 6 on the valve seat 4, the movable sealing plate 5 on the other side is separated from the valve seat 4 along with the butterfly plate 1, and the valve is opened; when the valve is closed, the rotary valve rod 2 makes the movable sealing plate 5 adhere to and be pressed against the valve seat 4, the edge of the butterfly plate 1 contacts and seals the tapered surface of the inner edge of the valve seat 4, and the butterfly plate 1 is in contact with the fixed sealing plate 6 of the valve seat 4; the device increases the contact surface area of the butterfly plate 1 and the valve seat 4 by using the movable sealing plate 5 and the fixed sealing plate 6, and the movable sealing plate 5 increases the pressure receiving area in the forward direction, the tapered contact surface of the butterfly plate 1 is pressed against the valve seat 4, the contact surface of the butterfly plate 1 and the valve seat 4 is pressed more tightly, and the sealing effect is better.

[0029] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A four-eccentric hard-seal butterfly valve, characterized by, The valve comprises a butterfly plate, a valve stem and a valve body, one plate surface of the butterfly plate is fixedly connected with the valve stem, the valve stem is rotationally connected with the valve body, a valve seat is fixedly connected in the valve body, an outer edge surface of the butterfly plate is in contact with an inner edge surface of the valve seat, the taper of the outer edge surface of the butterfly plate is matched with the taper of the inner edge surface of the valve seat, a movable sealing plate is fixedly connected on the plate surface of one side of the valve stem, a fixed sealing plate is fixedly connected on the other side of the valve stem, the movable sealing plate is in contact with the valve seat when the butterfly plate is closed, and the butterfly plate is in contact with the fixed sealing plate.

2. The four-eccentric hard-seal butterfly valve according to claim 1, characterized in that: A worm box is fixedly connected on the valve body, a worm wheel and a worm are rotationally arranged in the worm box and are in meshing engagement, the center of the worm wheel is fixedly connected with the valve stem, and the worm is provided with an input shaft extending out of the worm box.

3. The four eccentric hard-seal butterfly valve according to claim 1, characterized in that: The movable sealing plate and the fixed sealing plate are respectively bolted on the butterfly plate and the valve seat.

4. The four eccentric hard-seal butterfly valve according to claim 3, characterized in that: The movable sealing plate and the fixed sealing plate are rotationally connected with the valve stem.

5. The four eccentric hard-seal butterfly valve according to claim 1, characterized in that: The taper of the inner edge surface of the valve seat at the fixed sealing plate connecting position is greater than the taper of the inner edge surface of the valve seat at the movable sealing plate connecting position.

6. The four eccentric hard-seal butterfly valve according to claim 1, characterized in that: A reinforcing rib is fixedly connected on the valve stem, and the reinforcing rib is fixedly connected with the butterfly plate.

7. The four eccentric hard-seal butterfly valve according to claim 1, characterized in that: Sealing grooves are arranged on the contact surfaces between the butterfly plate and the fixed sealing plate and between the movable sealing plate and the valve seat and are in engagement with each other.

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