CN212226019U - Positive circle three-eccentric butterfly valve for hypersonic wind tunnel - Google Patents
Positive circle three-eccentric butterfly valve for hypersonic wind tunnel Download PDFInfo
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- CN212226019U CN212226019U CN202021279424.3U CN202021279424U CN212226019U CN 212226019 U CN212226019 U CN 212226019U CN 202021279424 U CN202021279424 U CN 202021279424U CN 212226019 U CN212226019 U CN 212226019U
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Abstract
The utility model discloses a hypersonic wind tunnel is with three eccentric butterfly valves of perfect circle. The rotation axis e of the sealing surface of the right-circular three-eccentric butterfly valve is a function curve, the sealing surface is an irregular oblique cone, and the cross section of a graph obtained by cutting the oblique cone by using any plane perpendicular to a flow channel and a valve central line c is a right circle, namely, a half shaft A is equal to a half shaft B. This three eccentric butterfly valves of perfect circle can be satisfying valve intensity rigidity, sealed specific pressure and do not cause the function curve that the motion interfered that the design is different under these three prerequisite conditions, obtain more reasonable engagement angle beta, make three eccentric butterfly valves change in opening, and simultaneously, in order to match with engagement angle beta, 2 eccentric sizes can be designed littleer, thereby reduce the offset distance that is brought by eccentric 2, greatly reduced three eccentric butterfly valves's the moment of torsion that opens, reach and reduce the wearing and tearing between valve plate sealing washer and the valve body seal receptacle sealing face, extension three eccentric butterfly valves life's purpose.
Description
Technical Field
The utility model belongs to the technical field of hypervelocity wind tunnel test equipment, concretely relates to hypersonic wind tunnel is with three eccentric butterfly valves of perfect circle.
Background
The hypersonic wind tunnel test equipment usually adopts a high-pressure blowing and vacuum exhausting mode to maintain the test, the vacuum exhausting is usually carried out by pumping a vacuum container to a specified vacuum pressure before the test, then the test is started, the pressure of the vacuum container is continuously increased in the test process, and the test is stopped until the pressure is increased to a pressure which can not maintain the test of the wind tunnel.
With the development of hypersonic wind tunnel equipment, the flow rate of test gas is larger and higher, and the requirement is higher and higher, if a vacuum container with huge scale is built by continuously adopting a vacuum container mode, the test can be maintained, and the cost and the feasibility are not the best choice. Therefore, a combined exhaust mode is provided, and the combined exhaust mode consists of a vacuum system and an exhaust system, wherein the vacuum system provides pressure required by the construction of a test flow field, and the test is maintained for a short time. The exhaust system is used for maintaining the long-time running of the wind tunnel test.
The combined exhaust mode needs to rapidly communicate the vacuum system with the exhaust system in the test process, so as to maintain the test continuously. Because the diameter of the pipeline is large, the quick switching valve needs to have a quick opening function, and therefore a three-eccentric center butterfly valve is generally adopted.
The offset distance between the radial axis a of the valve rod of the three-eccentric butterfly valve, which is vertical to the direction of the flow channel, and the central line b of the sealing surface of the valve plate along the axial direction of the flow channel is eccentric 1; the offset distance between the valve rod rotation axis d and the valve body and the flow channel central line c along the flow channel radial direction is eccentric 2; the deflection angle alpha of the sealing surface rotation axis e and the valve body and the flow channel central line c along the flow channel radial direction is eccentric 3, the structure of the sealing surface on the space is a regular cone taking the sealing surface rotation axis e as a normal line, the boundary of the sealing surface is a prime line, and the normal line of the regular cone and the valve body and the flow channel central line c form a fixed deflection angle alpha, so that the sectional shape of a graph obtained by cutting an oblique cone by any plane perpendicular to the flow channel and the valve central line c is an ellipse, namely the half axis A is not equal to the half axis B, and the space shape of the sealing surface can be understood as a regular cone rotating by. An included angle between a tangent line of a rotation track of the valve plate sealing ring and a sealing surface of the valve body sealing seat is a meshing angle beta, and a fixed declination angle alpha can bring a fixed meshing angle beta.
The development of the eccentric butterfly valve is a process that the opening torque is continuously reduced and the opening is easier from an initial single eccentric butterfly valve (namely a center line butterfly valve) to a double eccentric butterfly valve and then to a triple eccentric butterfly valve, compared with the single eccentric butterfly valve and the double eccentric butterfly valve, the opening torque of the triple eccentric butterfly valve is greatly reduced, but the triple eccentric butterfly valve has the defects that a reasonable meshing angle beta cannot be freely designed through different working conditions, so that the meshing angle beta is larger, a valve plate sealing ring is not easy to separate from a sealing surface of a valve body sealing seat, the opening torque is increased, the drift diameter of the triple eccentric butterfly valve used in an ultrahigh speed wind tunnel is generally over DN2000, the opening torque is generally up to hundreds of thousands of N.m, the manufacturing cost of an actuator is even far higher than that of the triple eccentric butterfly valve, and meanwhile, the valve plate sealing ring is not easy to separate from the sealing surface of the valve body sealing seat, and the valve plate sealing ring, the service life of the three-eccentric butterfly valve is shortened, and the three-eccentric butterfly valve with the traditional structure cannot meet the requirement of an ultra-high speed wind tunnel.
At present, the development of a perfect circle three-eccentric butterfly valve for the hypersonic wind tunnel is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a hypersonic wind tunnel is with three eccentric butterfly valves of perfect circle is provided.
The utility model discloses a perfect circle three-eccentric butterfly valve for hypersonic wind tunnel, which comprises a valve body, a valve plate sealing ring, a pressing plate, an inner hexagon screw and a valve rod; the valve body is coaxial with the flow channel, and a sealing seat of the valve body is provided with a sealing surface matched with a sealing ring of the valve plate; the valve plate is arranged on the valve rod and rotates around the valve rod in the valve body; the valve plate sealing ring is pressed on the valve plate through the pressure plate and is fixed through hexagon socket head cap screws uniformly distributed on the edge of the valve plate, and the valve plate sealing ring is in conical surface fit with a sealing surface on the valve body sealing seat and serves as a main sealing pair of the valve; the eccentric distance between a radial axis a of a valve rod of the perfect circle three-eccentric butterfly valve, which is vertical to the direction of a flow channel, and a central line b of a sealing surface of a valve plate along the axial direction of the flow channel is eccentric 1; the offset distance between the valve rod rotation axis d and the valve body and the flow channel central line c along the flow channel radial direction is eccentric 2; the deflection angle alpha between the seal surface rotary axis e and the valve body and the flow channel central line c along the flow channel radial direction is eccentric 3; an included angle between a tangent line of a rotation track of the valve plate sealing ring and a sealing surface of the valve body sealing seat is a meshing angle beta; the rotary axis e of the sealing surface is a function curve, the sealing surface is an irregular oblique cone, and the section of a graph obtained by cutting the oblique cone by any plane perpendicular to the flow channel and the central line c of the valve is a perfect circle, namely, the half axis A is equal to the half axis B.
The rotation angle range of the valve plate is 0-90 degrees.
The utility model discloses a hypersonic wind tunnel becomes function curve with three eccentric butterfly valves of perfect circle with sealed face axis of revolution e from the fixed axis, can satisfy valve intensity rigidity, sealed specific pressure reaches and does not cause the function curve that the motion interferes this three prerequisite and design the difference, obtain more reasonable engagement angle beta, make three eccentric butterfly valves change in opening, and simultaneously, in order to match with engagement angle beta, 2 eccentric sizes can be designed littleer, thereby reduce the offset distance that is brought by 2 eccentrics, the moment of torsion of opening of greatly reduced three eccentric butterfly valves, reach and reduce the wearing and tearing between valve plate sealing washer and the sealed face of valve body seal receptacle, extension three eccentric butterfly valve life's purpose.
Drawings
FIG. 1 is a schematic perspective view of a perfect circle triple offset butterfly valve for hypersonic wind tunnel according to the present invention;
fig. 2 is the schematic diagram of the utility model discloses a hypersonic wind tunnel is with three eccentric butterfly valves of perfect circle.
In the figure, 1, a valve body 2, a valve plate 3, a valve plate sealing ring 4, a pressure plate 5, an inner hexagon screw 6 and a valve rod are arranged;
a is a radial axis of the valve rod perpendicular to the direction of the flow channel;
b is the center line of the sealing surface of the valve plate;
c is the center line of the valve body and the flow passage;
d is the valve rod rotation axis;
e is a sealing surface rotation axis;
alpha is the deflection angle of the sealing surface rotation axis e and the valve body and the flow channel central line c along the radial direction of the flow channel;
beta is an included angle between a tangent of a rotation track of the valve plate sealing ring and a sealing surface of the valve body sealing seat, namely a meshing angle.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1 and 2, the utility model discloses a perfect circle three-eccentric center butterfly valve for hypersonic wind tunnel, which comprises a valve body 1, a valve plate 2, a valve plate sealing ring 3, a pressure plate 4, an inner hexagon screw 5 and a valve rod 6; the valve body 1 is coaxial with the flow channel, and a sealing seat of the valve body 1 is provided with a sealing surface matched with a sealing ring 3 of the valve plate 2; the valve plate 2 is arranged on the valve rod 6, and the valve plate 2 rotates around the valve rod 6 in the valve body 1; the valve plate sealing ring 3 is pressed on the valve plate 2 through a pressure plate 4 and is fixed through hexagon socket head cap screws 5 uniformly distributed on the edge of the valve plate 2, and the valve plate sealing ring 3 and a sealing surface on a sealing seat of the valve body 1 form conical surface fit to be used as a main sealing pair of the valve; the valve rod 6 of the right-circular triple eccentric butterfly valve is eccentric 1 along the axial offset distance of the flow channel between the radial axis a vertical to the flow channel direction and the central line b of the sealing surface of the valve plate 2; the offset distance between the valve rod rotation axis d and the valve body and the flow channel central line c along the flow channel radial direction is eccentric 2; the deflection angle alpha between the seal surface rotary axis e and the valve body and the flow channel central line c along the flow channel radial direction is eccentric 3; an included angle between a tangent line of a rotation track of the valve plate sealing ring 3 and a sealing surface of a sealing seat of the valve body 1 is a meshing angle beta; the rotary axis e of the sealing surface is a function curve, the sealing surface is an irregular oblique cone, and the section of a graph obtained by cutting the oblique cone by any plane perpendicular to the flow channel and the central line c of the valve is a perfect circle, namely, the half axis A is equal to the half axis B.
The range of the rotation angle of the valve plate 2 is 0-90 degrees.
Example 1
In the embodiment, the perfect-circle three-eccentric butterfly valve is applied to the ultra-high speed wind tunnel, the sealing surface rotary axis e designed under the three preconditions of valve strength rigidity, sealing specific pressure and no motion interference has a more reasonable engagement angle beta, the size of the eccentric 2 can be reduced by 30-50% compared with the eccentric 2 of the three-eccentric butterfly valve, and the purpose of opening the perfect-circle three-eccentric butterfly valve by using smaller torque is realized.
Claims (2)
1. A normal circle three-eccentric butterfly valve for an ultra-high sound velocity wind tunnel comprises a valve body (1), a valve plate (2), a valve plate sealing ring (3), a pressing plate (4), an inner hexagon screw (5) and a valve rod (6); the valve body (1) is coaxial with the flow channel, and a sealing seat of the valve body (1) is provided with a sealing surface matched with a sealing ring (3) of the valve plate (2); the valve plate (2) is arranged on the valve rod (6), and the valve plate (2) rotates around the valve rod (6) in the valve body (1); the valve plate sealing ring (3) is pressed on the valve plate (2) through a pressure plate (4) and is fixed through inner hexagon screws (5) uniformly distributed on the edge of the valve plate (2), and the valve plate sealing ring (3) and a sealing surface on a sealing seat of the valve body (1) form conical surface fit to be used as a main sealing pair of the valve; the valve is characterized in that the offset distance between the radial axis a of the valve rod (6) of the perfect circle three-eccentric butterfly valve, which is vertical to the direction of the flow channel, and the central line b of the sealing surface of the valve plate (2) along the axial direction of the flow channel is eccentric 1; the offset distance between the valve rod rotation axis d and the valve body and the flow channel central line c along the flow channel radial direction is eccentric 2; the deflection angle alpha between the seal surface rotary axis e and the valve body and the flow channel central line c along the flow channel radial direction is eccentric 3; an included angle between a tangent line of a rotation track of the valve plate sealing ring (3) and a sealing surface of a sealing seat of the valve body (1) is a meshing angle beta; the rotary axis e of the sealing surface is a function curve, the sealing surface is an irregular oblique cone, and the section of a graph obtained by cutting the oblique cone by any plane perpendicular to the flow channel and the central line c of the valve is a perfect circle, namely, the half axis A is equal to the half axis B.
2. The valve plate (2) according to claim 1 has a range of rotation angles of 0 ° to 90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021279424.3U CN212226019U (en) | 2020-07-02 | 2020-07-02 | Positive circle three-eccentric butterfly valve for hypersonic wind tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021279424.3U CN212226019U (en) | 2020-07-02 | 2020-07-02 | Positive circle three-eccentric butterfly valve for hypersonic wind tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212226019U true CN212226019U (en) | 2020-12-25 |
Family
ID=73911746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021279424.3U Active CN212226019U (en) | 2020-07-02 | 2020-07-02 | Positive circle three-eccentric butterfly valve for hypersonic wind tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212226019U (en) |
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2020
- 2020-07-02 CN CN202021279424.3U patent/CN212226019U/en active Active
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