Double-partition four-eccentric hard sealing butterfly valve

Abstract

The utility model discloses a double-partition four-eccentric hard sealing butterfly valve which comprises a valve body, a valve rod and a butterfly plate, a medium flow channel and a valve seat are arranged in the valve body, the valve seat is matched with the butterfly plate to seal the medium flow channel, the valve rod is arranged in a rotating mode relative to the valve body, the butterfly plate and the valve rod are fixedly arranged, and the valve seat comprises an upper sealing seat and a lower sealing seat. The butterfly plate is provided with an upper sealing pair and a lower sealing pair and is driven by the valve rod to drive the upper sealing pair and the lower sealing pair to be close to or away from the valve seat. According to the double-partition four-eccentric hard sealing butterfly valve, due to the arrangement of a double-sealing-pair four-eccentric metal sealing structure, two-way isobaric, double-sealing, double-partition, zero-leakage, unlimited installation direction, sealing use, long service life of maintenance cycle and dual purposes can be achieved, the double-partition four-eccentric hard sealing butterfly valve has the characteristic of two-way isobaric sealing, and even if one sealing pair is damaged, the double-partition four-eccentric hard sealing butterfly valve is not damaged. And the other sealing pair still has a sealing effect, so that the use safety of the valve is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of four-eccentric butterfly valves, in particular to a double-block four-eccentric hard-sealed butterfly valve. Background Art

[0002] Usually in the valve industry, butterfly valve is one of the commonly used valve types. Butterfly valves have been continuously improved from centerline butterfly valves (single eccentric) to double eccentric butterfly valves, and then to triple eccentric butterfly valves. After each improvement, the torque on the valve stem is continuously reduced, making it easier to open and able to meet more working conditions. However, although the triple eccentric is a very good structure, compared with the single eccentric and double eccentric, the opening torque is greatly reduced, but the reverse sealing effect is not ideal, and it is difficult to meet the working requirements of two-way sealing. In addition, the sealing surface of the triple eccentric butterfly valve is greatly worn during the closing process, resulting in a shorter service life of the valve.

[0003] Therefore, it is particularly urgent to develop a butterfly valve with low production cost, strong applicability, long service life and bidirectional sealing. Utility Model Content

[0004] In view of the prior art, the purpose of the utility model is to provide a double-partition four-eccentric hard-sealed butterfly valve with a simple, ingenious and reasonable structure, which can achieve two-way sealing, good wear resistance, small required torque, long service life, and can ensure the safe and stable operation of equipment.

[0005] In order to achieve the above objectives, the technical solution adopted by the utility model is: a double-block four-eccentric hard-sealed butterfly valve, comprising a valve body, a valve stem and a butterfly plate, wherein a medium flow channel and a valve seat are arranged in the valve body, the valve seat is located in the medium flow channel and is used to seal the medium flow channel in matching with the butterfly plate, the valve stem is rotatably arranged relative to the valve body, the butterfly plate and the valve stem are fixedly arranged, the valve seat comprises an upper sealing seat and a lower sealing seat, an upper sealing pair and a lower sealing pair are respectively arranged on the butterfly plate relative to the upper sealing seat and the lower sealing seat, the butterfly plate is driven by the valve stem to drive the upper sealing pair and the lower sealing pair to approach or move away from the valve seat, the center line of the valve stem is eccentrically arranged with the center position of the upper sealing seat and the lower sealing seat of the valve seat, the center line of the flow channel outside the valve seat is eccentrically arranged with the center line of the flow channel inside the valve seat, the upper sealing seat and the lower sealing seat are eccentrically arranged with respect to each other, and the axial centers of the upper sealing seat and the lower sealing seat are eccentrically arranged with the center line of the medium flow channel.

[0006] As a further configuration of the above solution, the upper sealing pair and the lower sealing pair are symmetrically overlapped with each other after being rotated 180° about the center line of the valve stem.

[0007] As a further configuration of the above solution, the sealing surfaces of the upper sealing pair and the lower sealing pair and the upper sealing seat and the lower sealing seat are respectively provided with inclined surfaces and straight surfaces, and the inclined surfaces and the straight surfaces are arranged opposite to each other.

[0008] As a further configuration of the above solution, the upper sealing pair and the lower sealing pair include an integral metal ring, a pressure ring and screws, and the screws pass through the pressure ring to fix the integral metal ring on the butterfly plate.

[0009] As a further configuration of the above solution, the upper sealing seat and the lower sealing seat include a set screw, a clamping ring and a valve body seat, and the set screw passes through the clamping ring to fasten the valve body seat to the valve body to form a valve seat structure.

[0010] Beneficial effect: The double-blocking four-eccentric hard-sealed butterfly valve of the utility model can achieve bidirectional equal pressure, double sealing, double blockage and zero leakage through the double-sealing pair four-eccentric metal sealing structure. There is no restriction on the installation direction, the seal has a long service life and the maintenance cycle is long. One valve has two uses and not only has the characteristics of bidirectional equal pressure sealing, but also even if one sealing pair is damaged, the other sealing pair can still play a sealing effect, which greatly improves the safety of valve use. Compared with the fixed hard-sealed ball valve of the same caliber pressure material, the double-sealing pair four-eccentric metal sealed bidirectional pressure zero leakage butterfly valve has light weight, small size, small torque, low price, good economy, easy disassembly and assembly of parts, and low cost of later replacement and maintenance. It is the best choice to replace the fixed ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model four-eccentric double-blocking butterfly valve.

[0012] Figure 2 Schematic diagram of radial cross section of the medium flow channel of the butterfly valve of this embodiment.

[0013] Figure 3 It is a schematic diagram of the butterfly valve disc of the utility model being driven to rotate by the valve stem.

[0014] Figure 4 For this embodiment Figure 1 A partial enlarged schematic diagram is shown in the figure.

[0015] Figure numerals: 1, valve body; 2, valve stem; 3, butterfly plate; 4, medium flow channel; 5, valve seat; 51, upper sealing seat; 511, inclined surface; 512, straight surface; 52, lower sealing seat; 53, set screw; 54, retaining ring; 55, valve body seat; 71, upper sealing pair; 72, lower sealing pair; 73, integral metal ring; 74, pressure ring; 75, screw. DETAILED DESCRIPTION

[0016] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0017] like Figure 1-4 The double-block four-eccentric hard-sealed butterfly valve shown in the figure comprises a valve body 1, a valve stem 2 and a butterfly plate 3, wherein a medium flow channel 4 and a valve seat 5 are arranged in the valve body 1, wherein the valve seat 5 is located in the medium flow channel 4 and is used to match and seal the medium flow channel 4 with the butterfly plate 3, wherein the valve stem 2 is rotatably arranged relative to the valve body 1, wherein the butterfly plate 3 is fixedly arranged with the valve stem 2, wherein the valve seat 5 comprises an upper sealing seat 51 and a lower sealing seat 52, wherein upper sealing pairs are arranged on the butterfly plate 3 relative to the upper sealing seat 51 and the lower sealing seat 52 71 and lower sealing pair 72, the butterfly plate 3 is driven by the valve stem 2 to drive the upper sealing pair 71 and the lower sealing pair 72 to approach or move away from the valve seat 5, the center line of the valve stem 2 is eccentrically arranged with the center position of the upper sealing seat 51 and the lower sealing seat 52 of the valve seat 5, the center line of the outer flow channel of the valve seat 5 is eccentrically arranged with the center line of the inner flow channel of the valve seat 5, the upper sealing seat 51 and the lower sealing seat 52 are eccentrically arranged with each other, and the axial centers of the upper sealing seat 51 and the lower sealing seat 52 are eccentrically arranged with the center line of the medium flow channel 4.

[0018] As a further configuration of the above scheme, the upper sealing pair 71 and the lower sealing pair 72 are symmetrically overlapped with each other after being rotated 180° about the center line of the valve stem 2, and the sealing surfaces of the upper sealing pair 71 and the lower sealing pair 72 and the upper sealing seat 51 and the lower sealing seat 52 are respectively provided with an inclined surface 511 and a straight surface 512, and the inclined surface 511 and the straight surface 512 are relatively arranged.

[0019] As a further configuration of the above solution, the upper sealing pair 71 and the lower sealing pair 72 include an integral metal ring 73 , a pressure ring 74 and a screw 75 . The screw 75 passes through the pressure ring 74 to fix the integral metal ring 73 on the butterfly plate 3 .

[0020] As a further configuration of the above solution, the upper sealing seat 51 and the lower sealing seat 52 include a set screw 53, a retaining ring 54 and a valve body seat 55. The set screw 53 passes through the retaining ring 54 to fasten the valve body seat 55 to the valve body 1 to form a valve seat 5 structure.

[0021] Embodiment: A double-block four-eccentric hard-sealed butterfly valve of this embodiment includes a valve body 1, a valve stem 2 and a butterfly plate 3. A medium flow channel 4 and a valve seat 5 composed of a set screw 53, a retaining ring 54 and a valve body seat 55 are arranged in the valve body 1. The set screw 53 passes through the retaining ring 54 to fasten the valve body seat 55 to the valve body 1 to form a valve seat 5, and the valve seat 5 is located in the medium flow channel 4 and matches the butterfly plate 3 for sealing the medium flow channel 4. In addition, the valve stem 2 of this embodiment extends into the valve body 1 through an axial hole arranged on the valve body 1, and extends from the other end of the valve body 1 after passing through the medium flow channel 4. The valve stem 2 is rotatably arranged in the axial hole, and the butterfly plate 3 is fixedly connected to the valve stem 2. When the valve stem 2 is driven by the power structure to rotate, the butterfly plate 3 is driven to rotate relative to the valve seat 5, thereby realizing the opening of the medium flow channel 4. Closed, specifically, the valve seat 5 includes an upper sealing seat 51 and a lower sealing seat 52, and the butterfly plate 3 is provided with an upper sealing pair 71 and a lower sealing pair 72 respectively relative to the upper sealing seat 51 and the lower sealing seat 52, wherein the upper sealing seat 51 matches the upper sealing pair 71, and the lower sealing seat 52 matches the lower sealing pair 72, and a double partition seal is formed under the drive of the valve stem 2, and based on the eccentric rotation, the two can better withstand the medium pressure on both sides of the butterfly plate 3 after sealing, and realize bidirectional equal pressure, and based on its bidirectional partition seal design characteristics, it does not need to limit the direction during installation, and the installation is simpler to use. As mentioned above, the butterfly plate 3 of this embodiment is driven based on the valve stem 2, which can drive the upper sealing pair 71 and the lower sealing pair 72 to be close to or away from the valve seat 5 to realize the opening and closing of the valve, and the basis for realizing the double partition bidirectional seal includes:

[0022] First eccentricity: that is, axial eccentricity, the center line of the valve stem 2 is eccentric to the center position of the upper sealing seat 51 and the lower sealing seat 52 of the valve seat 5, such as Figure 2 The valve stem 2 is shown to have a dimension distance E1 from the upper sealing seat 51 and the lower sealing seat 52 on both sides;

[0023] Second eccentricity: namely radial eccentricity, the center line of the flow channel outside the valve seat 5 is eccentrically arranged with the center line of the flow channel inside the valve seat 5. The radial eccentricity of this embodiment is as follows. Figure 2 The center line of the flow channel outside the valve seat 5 shown is offset from the center line of the flow channel inside the valve seat 5 by a distance E2;

[0024] The third eccentricity: that is, the distance eccentricity. The upper sealing pair 71 and the lower sealing pair 72 are located at the relative inlet and outlet of the medium flow channel 4 of the valve body 1. On the central section of the inner cavity of the valve body 1 perpendicular to the center line of the valve stem 2, they are not concentric with the center line of the inlet and outlet of the medium flow channel 4 of the valve body 1. The center lines of the upper sealing pair 71 and the lower sealing pair 72 are not concentric, and there is a distance eccentricity dimension E3;

[0025] Fourth eccentricity: that is, angular eccentricity. The upper sealing pair 71 and the lower sealing pair 72 of this embodiment are circular structures obtained by cutting an elliptical cone-shaped structure after being tilted. The elliptical cone axis center and the center line of the medium flow channel 4 of the valve body 1 are eccentrically arranged at an angle α. Figure 2 shown.

[0026] E1, E2, E3 and α in the above embodiments can be changed and adjusted according to the size and usage requirements of the product.

[0027] As a further configuration of the above scheme, the upper sealing pair 71 and the lower sealing pair 72 are symmetrically overlapped with each other after rotating 180° about the center line of the valve stem 2. The sealing surfaces of the upper sealing pair 71 and the lower sealing pair 72 and the upper sealing seat 51 and the lower sealing seat 52 are respectively provided with an inclined surface 511 and a straight surface 512, and the inclined surface 511 and the straight surface 512 are arranged opposite to each other. Figure 2 As shown, the section angle is the horizontal centerline section of the valve body 1. The inclined surface 511 and the straight surface 512 at this position are opposite to each other, and both are gradually changed toward the other side.

[0028] As a further configuration of the above scheme, the upper sealing pair 71 and the lower sealing pair 72 include an integral metal ring 73, a pressure ring 74 and a screw 75, and the screw 75 passes through the pressure ring 74 to fix the integral metal ring 73 on the butterfly plate 3, and the upper sealing seat 51 and the lower sealing seat 52 include a set screw 53, a clamping ring 54 and a valve body seat 55, and the set screw 53 passes through the clamping ring 54 to fasten the valve body seat 55 to the valve body 1 to form a valve seat 5 structure, such as Figure 2 , 3 shown.

[0029] The four-eccentric metal-sealed butterfly valve of this embodiment is designed by referring to the sealing structure of the fixed ball valve. Figure 1-4 The double-seal pair double valve seat double partition structure shown in the figure, the two seal pairs are arranged on both sides of the valve body with the valve shaft center, as shown in the figure. Figure 2 The two sealing pairs shown are symmetrically overlapped with each other after rotating 180° about the center line of the valve shaft. On the plane perpendicular to the center line of the valve shaft, there are symmetrical eccentricities E2 between the inner diameter center lines of the upper and lower flow channel openings and the center line of the valve body pipeline, that is, there is an eccentricity value E3 at the position centers of the two sealing pairs. When the butterfly plate is opened and closed at 0-90°, due to the eccentricity E3, the inclined surface 511 of the upper sealing pair 71 will not interfere with the lower sealing pair 72 and the straight surface 512 of the lower sealing seat 52. Conversely, the inclined surface 511 of the lower sealing pair 72 will not interfere with the upper sealing pair 71 and the straight surface 512 of the upper sealing seat 51.

[0030] The double-sealing pair four-eccentric metal-sealed butterfly valve of this embodiment can achieve bidirectional equal pressure, double seals, double partitions and zero leakage. There is no restriction on the installation direction. The seal has a long service life and a long maintenance cycle. One valve has two uses. Even if one sealing pair is damaged, the other sealing pair can still play a sealing effect, which greatly improves the safety of valve use. Compared with the fixed hard-sealed ball valve of the same caliber pressure material, the double-sealing pair four-eccentric metal-sealed bidirectional pressure zero leakage butterfly valve is light in weight, small in size, small in torque, low in price, good in economy, easy to disassemble and assemble parts, and low in cost for later replacement and maintenance. It is the best choice to replace the fixed ball valve.

[0031] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A double-block four-eccentric hard-sealed butterfly valve, characterized in that: The valve body (1) comprises a valve body (1), a valve stem (2) and a butterfly plate (3), wherein a medium flow channel (4) and a valve seat (5) are arranged in the valve body (1), and the valve seat (5) is located in the medium flow channel (4) and is used to match the butterfly plate (3) to seal the medium flow channel (4), the valve stem (2) is rotatably arranged relative to the valve body (1), the butterfly plate (3) and the valve stem (2) are fixedly arranged, the valve seat (5) comprises an upper sealing seat (51) and a lower sealing seat (52), and the butterfly plate (3) is respectively provided with an upper sealing pair (71) and a lower sealing pair (72) relative to the upper sealing seat (51) and the lower sealing seat (52). The butterfly plate (3) is driven by the valve stem (2) to drive the upper sealing pair (71) and the lower sealing pair (72) to move closer to or farther from the valve seat (5); the center line of the valve stem (2) is eccentrically arranged with respect to the center positions of the upper sealing seat (51) and the lower sealing seat (52) of the valve seat (5); the center lines of the flow passage outside the valve seat (5) are eccentrically arranged with respect to the center lines of the flow passage inside the valve seat (5); the upper sealing seat (51) and the lower sealing seat (52) are eccentrically arranged with respect to each other; and the axial centers of the upper sealing seat (51) and the lower sealing seat (52) are eccentrically arranged with respect to the center line of the medium flow passage (4).

2. A double-block four-eccentric hard-sealed butterfly valve according to claim 1, characterized in that: The upper sealing pair (71) and the lower sealing pair (72) are arranged symmetrically and overlap each other after being rotated 180 degrees about the center line of the valve stem (2).

3. A double-block four-eccentric hard-sealed butterfly valve according to claim 2, characterized in that: The sealing surfaces of the upper sealing pair (71) and the lower sealing pair (72) and the upper sealing seat (51) and the lower sealing seat (52) are respectively provided with an inclined surface (511) and a straight surface (512), and the inclined surface (511) and the straight surface (512) are arranged opposite to each other.

4. A double-blocking four-eccentric hard-sealed butterfly valve according to claim 1, characterized in that: The upper sealing pair (71) and the lower sealing pair (72) comprise an integral metal ring (73), a pressure ring (74) and a screw (75), wherein the screw (75) passes through the pressure ring (74) to fix the integral metal ring (73) on the butterfly plate (3).

5. The double-blocking four-eccentric hard-sealed butterfly valve according to claim 1, characterized in that: The upper sealing seat (51) and the lower sealing seat (52) comprise a set screw (53), a clamping ring (54) and a valve body seat (55); the set screw (53) passes through the clamping ring (54) to fasten the valve body seat (55) to the valve body (1) to form a valve seat (5) structure.

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