Linkage lifting and rotating valve mechanism

Abstract

The linkage lifting and rotating valve mechanism comprises a valve body, a valve plug, a valve rod and a power mechanism, a valve cavity, a first channel and a second channel are formed in the valve body, the first channel is communicated with the second channel through the valve cavity, the valve cavity is in a frustum shape, and the large end of the valve cavity is located on the lower side of the small end of the valve cavity; the valve plug is in a frustum shape, the axis of the valve rod is coaxial with the axis of the valve plug, the upper end of the valve rod is fixedly connected with the valve plug, a through hole perpendicular to the axis of the valve plug is formed in the valve plug, the valve plug is arranged in the valve cavity, the valve plug is matched with the valve cavity, and the valve plug is arranged in the valve cavity. The valve rod can drive the valve plug to rotate around the axis of the valve plug. And the low-flow-resistance quick opening and closing requirements can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical engineering, and in particular relates to a linkage lift valve mechanism. Background Art

[0002] The existing valve that realizes low flow resistance and fast switching is a plug valve, which is a valve that can be opened or closed by rotating 90 degrees to connect or close the channel port on the valve plug with the channel port on the valve body. In the field of oil drilling, plug valves are widely used in drill string circulation systems. They are manual control valves that can play a high-pressure sealing role. However, the opening mechanism of general plug valves cannot meet the special requirements of fast opening and closing. Summary of the invention

[0003] In view of this, the present invention provides a linked lift valve mechanism, which can achieve low flow resistance and fast opening and closing requirements.

[0004] The technical solution adopted by the present invention is:

[0005] A linkage lift valve mechanism, comprising a valve body, a valve plug, a valve stem and a power mechanism, wherein a valve cavity, a first channel and a second channel are arranged in the valve body, the first channel is connected with the second channel through the valve cavity, the valve cavity is in a frustum shape, and the large end of the valve cavity is located below the small end thereof;

[0006] The valve plug is in a frustum shape, the axis of the valve stem is coaxial with the axis of the valve plug, and the upper end of the valve stem is fixedly connected to the valve plug, the valve plug is provided with a through hole perpendicular to its axis, the valve plug is arranged in the valve cavity, the valve plug cooperates with the valve cavity, and the valve stem can drive the valve plug to rotate around its axis so that the valve plug switches between an open state and a closed state;

[0007] In the open state, the through hole is aligned with the first channel and the second channel so that the first channel is connected to the second channel;

[0008] In the closed state, the axis of the through hole is perpendicular to the axis of the first channel, so that the first channel and the second channel are not connected to each other;

[0009] The lower end of the valve stem is also connected to a lifting mechanism. When the valve plug rotates from a closed state to an open state, the lifting mechanism pulls the valve stem downward by a preset distance, so that the valve plug moves downward by a preset distance; when the valve plug rotates from an open state to a closed state, the lifting mechanism pushes the valve stem upward by a preset distance, so that the valve plug moves upward by a preset distance;

[0010] The power mechanism drives the valve stem to rotate so that the valve plug switches between an open state and a closed state.

[0011] Preferably, the lifting mechanism comprises a lifting hinge rod and a threaded section arranged on the valve stem, and a threaded hole is provided in the lifting hinge rod, and the threaded hole is threadably matched with the threaded section.

[0012] Preferably, it further comprises a rotating hinge rod, a first connecting rod, a second connecting rod and a connecting block, wherein one end of the rotating hinge rod is connected to the valve stem key, the other end of the rotating hinge rod is rotatably connected to one end of the first connecting rod, and the other end of the first connecting rod is rotatably connected to the connecting block;

[0013] The free end of the lifting hinge rod is rotatably connected to one end of the second connecting rod, and the other end of the second connecting rod is rotatably connected to the connecting block.

[0014] Preferably, the length of the rotating hinge rod, the length of the lifting hinge rod and the length of the first connecting rod are all equal, and the length of the second connecting rod is greater than the length of the first connecting rod.

[0015] Preferably, the rotating hinge rod is located on an upper side of the lifting hinge rod.

[0016] Preferably, two sealing surfaces are connected to the side of the valve plug, the two sealing surfaces are arranged opposite to each other and are offset by 90° relative to the through hole in the circumferential direction. In the closed state, the two sealing surfaces respectively close the first channel and the second channel.

[0017] Preferably, the connecting block is provided with a first rotating point and a second rotating point, the first rotating point is located on the upper side of the second rotating point, the first connecting rod is rotationally connected to the first rotating point, and the second connecting rod is rotationally connected to the second rotating point.

[0018] Preferably, the valve cavity, the first channel and the second channel form a cavity group, and two of the cavity groups are provided in the valve body;

[0019] The valve plug, the valve stem, the lifting mechanism, the rotating hinge rod, the first connecting rod and the second connecting rod together constitute a motion group, the number of the motion groups is two, and the two motion groups correspond to the two cavity groups respectively;

[0020] The number of the connecting block is one, and the connecting block is connected to the two motion groups at the same time.

[0021] Preferably, the power mechanism is a hydraulic cylinder, and the hydraulic cylinder is connected to the connecting block.

[0022] Preferably, the lifting mechanism further comprises a lifting nut, wherein the lifting nut is arranged in the lifting hinge rod, and the lifting nut is formed with the threaded hole, and the threaded hole is threadably matched with the threaded section.

[0023] Beneficial effects of the present invention:

[0024] The valve cavity and the valve plug are both frustum-shaped, and the axial length of the valve cavity is slightly larger than the axial length of the valve plug, so that the valve plug can have a small range of axial movement space relative to the valve cavity. When in the closed state, the valve plug is in the highest position. At this time, the side wall of the valve plug fits and squeezes the inner wall of the valve cavity, thereby closing the first channel and the second channel; when the valve plug rotates from the closed state to the open state, the valve plug rotates 90°, and at the same time, the lifting mechanism moves the valve plug downward by a preset distance, so that the valve plug no longer fits tightly against the inner wall of the valve cavity, thereby reducing the friction generated when the valve plug rotates, thereby achieving the requirements of low flow resistance and rapid opening and closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0026] Figure 1 It is a structural schematic diagram of the linkage lift valve mechanism;

[0027] Figure 2 It is a partial schematic diagram of the linkage lift valve mechanism;

[0028] Figure 3 It is a schematic diagram of the base of the linkage lift valve mechanism;

[0029] Figure 4 It is a schematic diagram of the structure of the valve plug, valve stem, rotating hinge rod and lifting hinge rod;

[0030] Figure 5 It is a schematic diagram of the motion actuator Figure 1 ;

[0031] Figure 6 It is a schematic diagram of the motion actuator Figure 2 ;

[0032] Figure 7 It is a schematic diagram of the motion actuator with H<a;

[0033] Figure 8 This is a schematic diagram of the motion actuator with H = a. Figure 1 ;

[0034] Fig. 9 This is a schematic diagram showing the misalignment between the centerline of the valve plug hole and the centerline of the valve body flow channel;

[0035] Fig.10 This is a schematic diagram of the motion actuator with H = a. Figure 2 ;

[0036] Fig.11 It is a structural diagram of a four-bar linkage;

[0037] Fig.12 It is a cross-sectional view of the linkage lift valve mechanism.

[0038] In the figure: 1, valve body; 2, valve plug; 3, valve stem; 4, hydraulic cylinder; 5, rotating hinge rod; 6, lifting hinge rod; 7, connecting block; 8, first connecting rod; 9, second connecting rod;

[0039] 11. First channel; 12. Second channel;

[0040] 21. Through hole; 22. Sealing surface; 31. Threaded section; 61. Lifting nut. DETAILED DESCRIPTION

[0041] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. In order to avoid confusing the essence of the present invention, known methods, processes, procedures, and components are not described in detail.

[0042] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0043] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include", "comprising" and similar words should be interpreted in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to".

[0044] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0045] See also Figure 1-Figure 12 The present invention provides a linked lifting and rotating valve mechanism, including a valve body 1, a valve plug 2, a valve stem 3 and a power mechanism. The valve body 1 is provided with a valve cavity, a first channel 11 and a second channel 12. The first channel 11 is connected with the second channel 12 through the valve cavity. The valve cavity is in a frustum shape, and the large end of the valve cavity is located below the small end thereof.

[0046] The valve plug 2 is in a frustum shape, the axis of the valve stem 3 is coaxial with the axis of the valve plug 2, and the upper end of the valve stem 3 is fixedly connected to the valve plug 2. The valve plug 2 is provided with a through hole 21 perpendicular to its axis. The valve plug 2 is arranged in the valve cavity, and the valve plug 2 cooperates with the valve cavity. The valve stem 3 can drive the valve plug 2 to rotate around its axis so that the valve plug 2 can switch between an open state and a closed state.

[0047] In the open state, the through hole 21 is aligned with the first channel 11 and the second channel 12 so that the first channel 11 is in communication with the second channel 12 .

[0048] In the closed state, the axis of the through hole 21 is perpendicular to the axis of the first channel 11 , so that the first channel 11 and the second channel 12 are not connected to each other.

[0049] The lower end of the valve stem 3 is also connected to a lifting mechanism. When the valve plug 2 rotates from a closed state to an open state, the lifting mechanism pulls the valve stem 3 downward by a preset distance (usually within 3 mm, and the design and adjustment are performed according to actual conditions) to move the valve plug 2 downward by a preset distance; when the valve plug 2 rotates from an open state to a closed state, the lifting mechanism pushes the valve stem 3 upward by a preset distance to move the valve plug 2 upward by a preset distance.

[0050] The power mechanism drives the valve stem 3 to rotate, so that the valve plug 2 switches between an open state and a closed state.

[0051] The valve cavity and the valve plug 2 are both frustum-shaped, and the axial length of the valve cavity is slightly larger than the axial length of the valve plug 2, so that the valve plug 2 can have a small range of axial movement space relative to the valve cavity. When in the closed state, the valve plug 2 is in the highest position. At this time, the side wall of the valve plug 2 fits and squeezes the inner wall of the valve cavity, thereby closing the first channel 11 and the second channel 12; when the valve plug 2 rotates from the closed state to the open state, the valve plug 2 rotates 90°, and at the same time, the lifting mechanism pulls the valve plug 2 downward by a preset distance, so that the valve plug 2 no longer fits tightly against the inner wall of the valve cavity, thereby reducing the friction generated when the valve plug 2 rotates, thereby achieving the requirements of low flow resistance and rapid opening and closing.

[0052] When the valve plug 2 rotates from the open state to the closed state, the valve plug 2 rotates in the opposite direction by 90°, and at the same time, the lifting mechanism pushes the valve plug 2 upward by a preset distance. When reaching the closed state, the valve plug 2 fits tightly against the inner wall of the valve cavity, thereby ensuring the sealing performance.

[0053] The lifting mechanism includes a lifting hinge rod 6 and a threaded section 31 arranged on the valve stem 3 . A threaded hole is arranged in the lifting hinge rod 6 , and the threaded hole is threadably matched with the threaded section 31 .

[0054] The height of the lifting hinge remains unchanged, and thus the height of the threaded hole remains unchanged. When the valve stem 3 rotates, the threaded section 31 also rotates, causing the threaded section 31 to rotate relative to the threaded hole, thereby pushing the height of the valve stem 3 in the axial direction, thereby driving the valve plug 2 to move up and down.

[0055] It also includes a rotating hinge rod 5, a first connecting rod 8, a second connecting rod 9 and a connecting block 7, one end of the rotating hinge rod 5 is key-connected to the valve stem 3, the other end of the rotating hinge rod 5 is rotatably connected to one end of the first connecting rod 8, and the other end of the first connecting rod 8 is rotatably connected to the connecting block 7;

[0056] The free end of the lifting hinge rod 6 is rotatably connected to one end of the second connecting rod 9 , and the other end of the second connecting rod 9 is rotatably connected to the connecting block 7 .

[0057] A keyway is provided above the thread of the valve stem 3 to match the "rotating hinge rod 5". A key or ball is placed in the keyway to constrain the rotation between the "rotating hinge rod 5" and the valve stem 3 (the two are not constrained along the axial direction and can move up and down along the axial direction). The valve plug 2 needs to be rotated 90° to open and close, and the valve is opened and closed by driving the "rotating hinge rod 5" to rotate 90° clockwise or counterclockwise to complete the opening and closing of the valve.

[0058] Since the rotation direction between the "rotating hinge rod 5" and the valve stem 3 is constrained and there is no relative rotation, when the "lifting hinge rod 6" and the "rotating hinge rod 5" rotate at the same time, if the angle between the "lifting hinge rod 6" and the valve stem 3 (i.e., the "rotating hinge rod 5") changes, the "lifting hinge rod 6" fixed in the axial direction of the valve stem 3 will produce an upward or downward displacement; in addition, when the valve plug 2 is opening the valve, the sealing surface 22 of the valve plug 2 leaves the valve seat earlier than the rotation of the valve plug 2, which can reduce the friction of the sealing surface 22 and realize the function of quick opening and closing.

[0059] For the convenience of description, the rotating hinge rod 5, the first connecting rod 8, the second connecting rod 9 and the lifting hinge rod 6 are collectively referred to as a motion actuator, which is a spatial four-bar linkage.

[0060] See also Figure 5 ,

[0061] 1) OA: represents "rotating hinge rod 5"; AC: is the first connecting rod 8, connected to the connecting block 7C;

[0062] 2) OB: stands for "lifting hinge rod 6"; BC: is the second connecting rod 9, connected to the connecting block 7C;

[0063] 3) ∠AOC = α, this angle changes as the connection block 7C moves along the illustrated motion trajectory;

[0064] 4) ∠BOC = β, this angle changes as the connection block 7C moves along the illustrated motion trajectory;

[0065] 5) The sum of α+β is the angle between the “valve stem 3” (“rotating hinge rod 5”) and the “lifting hinge rod”.

[0066] 6) x, -x represents the travel of the connecting block 7 along the illustrated connecting block 7 along its motion trajectory, and its positive and negative meanings are: positive above the OO1 line and negative below the OO1 line.

[0067] 7) H is the distance between the movement trajectory of the connecting block 7 and the center point of the valve stem 3 ("rotating hinge rod 5", "lifting hinge rod 6").

[0068] The relationship between the angles is as follows:

[0069] cosα=(OA 2 +OC 2 -AC 2 ) / (2*OA*OC)…………(1)

[0070] cosβ=(OB 2 +OC 2 -BC 2 ) / (2*OB*OC)…………(2)

[0071] OC 2 =x 2 +H 2 …………(3)

[0072] Assume: OA = a, OB = a, AC = a, BC = b, and substitute equation (3) into equations (1) and (2):

[0073] We get: cosα=(a 2 +x 2 +H 2 -a 2 ) / (2*a*(x 2 +H 2 )^(1 / 2))=(x 2 +H 2 )^(1 / 2) / (2*a)

[0074] cosβ=(a 2 +x 2 +H 2 -b 2 ) / (2*a*(x 2 +H 2 )^(1 / 2))=(x 2 +H 2 )^(1 / 2) / (2*a)+(a 2 -b 2 ) / (2*a*(x 2 +H 2 )^(1 / 2))

[0075] Then: α=ACOS(COSα)

[0076] β=ACOS(COSβ)

[0077] ∵Derivative (cosα)′=x / (2*a*(x 2 +H 2 )^(1 / 2)) …………(4)

[0078] Derivative (cosβ)′=(cosα)′+(b 2 -a 2 )*x / (2*a*(x 2 +H 2 )^(3 / 2)) …………(5)

[0079] ∴According to Figure 5 The motion trajectory of the connecting block 7 shown in FIG. 1 shows the following variation rules:

[0080] 1) When it is above the OO1 line, since x>0, (cosα)′>0, cosα is monotonically increasing. As the connecting block 7 moves toward OO1, the x value decreases, and correspondingly cosα decreases. When the angle α=ACOS(COSα) is in [0, π / 2], as the x value decreases, α gradually increases.

[0081] 2) When it is below the OO1 line, the change law of the angle α is mirror-symmetrical with the change law of the angle α above the OO1 line, with the OO1 line as the symmetry line, that is, as the absolute value of x increases, α gradually decreases.

[0082] 3) Similarly, the changing rules of β and α are the same.

[0083] 4) Therefore, the corresponding sum of α+β follows the law of change of the angle between the "rotating hinge rod 5" and the "lifting hinge rod 6" as the "connecting block 7" slides from the "highest point above" to the "lowest point below": from the minimum angle → to the maximum angle → to the minimum angle, and vice versa.

[0084] Therefore, the law of the connecting rod mechanism can be obtained: Figure 5 In the figure, when the x value above OO1 is the maximum value, the valve plug 2 is set to be closed. When the connecting block 7C moves downward, due to the increase in the angle, the corresponding left or right rotation of the thread pair can make the valve plug 2 move away from the sealing surface 22.

[0085] Opening and closing requirements of the lift valve): The valve plug 2 rotates 90° to complete opening and closing.

[0086] Take the single-sided motion actuator and place it in the coordinate system XOY, such as Figure 6 As shown, wherein, θ: is the rotation angle of the rotating hinge rod 5 (i.e., the valve plug 2) relative to the OX axis; ψ: is the rotation angle of the first connecting rod 8 relative to the OX axis;

[0087] H: the distance between the center of the valve stem 3 and the motion center line of the connecting block 7 along the OX axis;

[0088] S: distance between the connection block 7 and the OX axis;

[0089] a: is the rod length of the rotating hinge rod 5, the lifting hinge rod 6, and the first connecting rod 8;

[0090] b: is the rod length of the second connecting rod 9.

[0091] According to the structural relationship of the mechanism: a*coSθ+a*cosψ=H

[0092] a*sinθ-a*sinψ=S

[0093] The stroke of the connecting block 7 is obtained as follows: S = a*sinθ±(a^2-(Ha*cosθ)^2)^(1 / 2),

[0094] 1) Assuming that the connection block 7 is located at the top of OX, the valve is fully closed at this time, then θ = 90°, and the corresponding S = a ± (a^2-H^2)^(1 / 2)…(6)

[0095] 2) When the connection block 7 slides to the bottom of OX, the valve is fully open and θ = 0°, and the corresponding S = ±(a^2-(Ha)^2)^(1 / 2)…(7)

[0096] From formula (6), we can know that:

[0097] a 2 -H 2 ≥0, then when H≤a, the formula satisfies that the valve plug 2 is in the closed position θ=90°;

[0098] When H<a, the coupling block 7 has two positions above the OX axis, such as Figure 7 As shown in the "connecting rod state when the valve is closed" on the left side of the figure, when the connecting block 7 is at the C'1 position in the figure, when the connecting block 7 slides from C'1 to C1, it will cause the valve plug 2 to rotate counterclockwise first, and then start to rotate clockwise after passing the C0 point. This does not meet the requirement that the poppet valve rotates 90° to complete opening and closing. Therefore, formula (6): S1=a-(a^2-H^2)^(1 / 2) That is, the position of the connecting block 7 should be selected Figure 7 Point C1 in the left figure.

[0099] When the connection block 7 selects point C1 in the figure as the starting point of the movement of the connection block 7 when the valve is fully closed, C2 is the position of the connection block 7 when the valve is fully opened.

[0100] ∵H<a

[0101] ∴S1=a-(a^2-H^2)^(1 / 2)=a-((a+H)(aH))^(1 / 2)<a-((aH)(aH))^(1 / 2)

[0102] ∵a-((aH))(aH))^(1 / 2)=a-(aH)=H

[0103] ∴S1<H

[0104] And ∵|S2|=(a^2-(Ha)^2)^(1 / 2)=(H*(a-H+a))^(1 / 2)>(H*a)^(1 / 2)>H

[0105] ∴S1<|S2|

[0106] When point C2 is the position of the connecting block 7 when the valve is fully opened, according to formulas (1) and (2), the distance between S2 and the OX axis is far, so the angle (α1+β1) between the "rotating hinge rod 5" and the "lifting hinge rod 6" when the valve is fully closed is greater than the angle (α2+β2) when the valve is closed, causing the valve plug 2 to fit the sealing surface 22 more closely when fully opened, which cannot meet the opening and closing requirements of the lifting valve. In summary:

[0107] H (the distance between the center of the valve stem 3 and the center line of the movement of the connecting block 7 along the OX axis) should be equal to the length a of the rotating hinge rod 5, the lifting hinge rod 6, and the first connecting rod 8 to meet the opening and closing requirements of the lifting valve. When H=a, the connecting rod state is shown in Figure 8 As shown in the figure, when opening from a fully closed state, Figure 8 As shown in the left figure, the movement direction of the connecting block 7 is perpendicular to the first connecting rod 8, the transmission angle of the rotating hinge rod 5 is 0, and the transmission angle γ of the lifting hinge rod 6 is larger. Accordingly, when the valve starts to open, the lifting hinge rod 6 rotates first.

[0108] And S1=|S2|=a………(8)

[0109] According to equation (4), derivative (cosα)′=x / (2*a*(x 2 +H 2 )^(1 / 2))

[0110] Formula (5) Derivative (cosβ)′=(cosα)′+(b 2 -a 2 )*x / (2*a*(x 2 +H 2 )^(3 / 2))

[0111] When b>a, x>0, then (cosβ)′-(cosα)′=(b 2 -a 2)*x / (2*a*(x 2 +H 2 )^(3 / 2))>0, the corresponding instantaneous angular velocity of "rotating hinge rod 5"<"lifting hinge rod 6", and then according to the above-mentioned law of the connecting rod mechanism 1) in Figure 5 In the figure, when the x value above OO1 is the maximum value, the valve plug 2 is set to be closed. When the connecting block 7C moves downward, due to the increase in the angle, the corresponding left or right rotation of the thread pair can make the valve plug 2 move away from the sealing surface 22.

[0112] When H=a, the motion actuator meets the opening and closing requirements of the lifting and rotating valve. The valve plug 2 rotates 90° to complete the opening and closing; 4) When the valve plug 2 is in the closed position and is ready to open the valve, the "lifting hinge rod 6" rotates faster than the "rotating hinge rod 5" to reduce the friction of the sealing surface 22;)

[0113] but:

[0114] When H = a, the corresponding S1 = |S2| = a, which will make the included angle of the "rotating hinge rod 5" and the "lifting hinge rod 6" the same when the valve is fully closed and fully opened, and the distance between the inclined surface of the valve plug 2 and the inclined surface of the valve body 1 is consistent, as shown in the figure. Fig. 9 shown.

[0115] according to Figure 8 The arrangement of the connecting rod structure shown in the figure will cause the center line of the valve plug 2 hole to be misaligned with the center line of the valve body 1 when the valve is fully opened, and there is an eccentric distance L. Fig. 9 shown.

[0116] By staggering the connection block 7 of the "rotating hinge rod 5" and the "first connecting rod 8" and the connection block 7 of the "lifting hinge rod 6" and the "second connecting rod 9" by a certain distance in the sliding direction of the connection block 7, it is ensured that the angle between the "rotating hinge rod 5" and the "lifting hinge rod 6" when the valve is "fully open" is a certain angle larger than that when the valve is "fully closed". Under this angle, combined with the proportional relationship between the pitch and lead (multi-thread) of the thread of the lifting hinge rod 6, the performance requirements of the lifting valve can be met when the valve is just fully closed (: When the valve is in the closed position, the two valve plugs 2 are in close contact with the valve body 1 seat to provide a seal. When the valve is opened, the two valve plugs 2 leave the valve body 1 seat and rotate 90 degrees. When the valve is in the open position, the circular hole on the valve plug 2 is in line with the passage of the valve body 1.)

[0117] The connection block 7 between the "rotating hinge rod 5" and the "first connecting rod 8" and the connection block 7 between the "lifting hinge rod 6" and the "second connecting rod 9" are staggered by a certain distance according to the sliding direction of the connection block 7. The arrangement diagram is as follows: Fig.10 As shown, where C1D1=ba, Fig.10The values ​​of α, β, and θ in the right figure can be obtained by the cosine formula of the triangle, and when the valve is fully open, the angle = α + β - θ, which is larger than the angle when the valve is fully closed (90° in the present invention). The difference between the angle when the valve is fully open and the angle when the valve is fully closed is: In order to eliminate the eccentricity L in Figure 9, the "lifting hinge rod 6" produces a relative rotation angle (i.e., the difference) relative to the valve stem 3, and the valve plug 2 moves down a distance L through the transmission of the threaded pair.

[0118] The length of the rotating hinge rod 5 , the length of the lifting hinge rod 6 and the length of the first connecting rod 8 are all equal, and the length of the second connecting rod 9 is greater than the length of the first connecting rod 8 .

[0119] The length of the second connecting rod 9 is greater than that of the first connecting rod 8, so that when the connecting block 7 pushes the first connecting rod 8 and the second connecting rod 9, the rotation speed of the rotating hinge rod 5 is slower than that of the lifting hinge rod 6. The rotating hinge rod 5 drives the valve stem 3 to rotate, so that the rotation speed of the valve stem 3 is inconsistent with the rotation speed of the lifting hinge rod 6. Therefore, the speed difference allows the valve stem 3 to move up and down slightly, thereby allowing the valve plug 2 to move up and down.

[0120] The rotating hinge rod 5 is located on the upper side of the lifting hinge rod 6. The two hinge rods are staggered up and down to avoid mutual interference.

[0121] The side of the valve plug 2 is also connected with two sealing surfaces 22, which are arranged opposite to each other and offset by 90° relative to the through hole 21 in the circumferential direction. In the closed state, the two sealing surfaces 22 respectively close the first channel 11 and the second channel 12. The sealing surfaces 22 can achieve a better sealing effect.

[0122] The connecting block 7 is provided with a first rotating point and a second rotating point, wherein the first rotating point is located above the second rotating point, the first connecting rod 8 is rotationally connected to the first rotating point, and the second connecting rod 9 is rotationally connected to the second rotating point.

[0123] The valve cavity, the first channel 11 and the second channel 12 form a cavity group, and two of the cavity groups are provided in the valve body 1;

[0124] The valve plug 2, the valve stem 3, the lifting mechanism, the rotating hinge rod 5, the first connecting rod 8 and the second connecting rod 9 together constitute a motion group. The number of the motion groups is two, and the two motion groups correspond to the two cavity groups respectively.

[0125] The number of the connecting block 7 is one, and the connecting block 7 is connected to the two motion groups at the same time.

[0126] The power mechanism is a hydraulic cylinder 4 , and the hydraulic cylinder 4 is connected to the connecting block 7 .

[0127] The lifting mechanism further comprises a lifting nut 61 , which is disposed in the lifting hinge rod 6 (may be key-connected), and the lifting nut 61 is formed with the threaded hole, which is threadedly matched with the threaded section 31 .

[0128] It should be understood that the above-mentioned embodiments are merely illustrative and not restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will all be included in the scope of the claims of the present invention.

Claims

1. A linkage lift valve mechanism, characterized in that: It comprises a valve body, a valve plug, a valve stem and a power mechanism, wherein a valve cavity, a first channel and a second channel are arranged in the valve body, the first channel is connected with the second channel through the valve cavity, the valve cavity is in a frustum shape, and the large end of the valve cavity is located below the small end thereof; The valve plug is in a frustum shape, the axis of the valve stem is coaxial with the axis of the valve plug, and the upper end of the valve stem is fixedly connected to the valve plug, the valve plug is provided with a through hole perpendicular to its axis, the valve plug is arranged in the valve cavity, the valve plug cooperates with the valve cavity, and the valve stem can drive the valve plug to rotate around its axis so that the valve plug switches between an open state and a closed state; In the open state, the through hole is aligned with the first channel and the second channel so that the first channel is connected to the second channel; In the closed state, the axis of the through hole is perpendicular to the axis of the first channel, so that the first channel and the second channel are not connected to each other; The lower end of the valve stem is also connected to a lifting mechanism. When the valve plug rotates from a closed state to an open state, the lifting mechanism pulls the valve stem downward by a preset distance, so that the valve plug moves downward by a preset distance; when the valve plug rotates from an open state to a closed state, the lifting mechanism pushes the valve stem upward by a preset distance, so that the valve plug moves upward by a preset distance; The power mechanism drives the valve stem to rotate so that the valve plug switches between an open state and a closed state.

2. The linkage lift valve mechanism according to claim 1, characterized in that: The lifting mechanism comprises a lifting hinge rod and a threaded section arranged on the valve stem. A threaded hole is arranged in the lifting hinge rod, and the threaded hole is threadably matched with the threaded section.

3. The linkage lift valve mechanism according to claim 2, characterized in that: It also includes a rotating hinge rod, a first connecting rod, a second connecting rod and a connecting block, wherein one end of the rotating hinge rod is connected to the valve stem key, the other end of the rotating hinge rod is rotatably connected to one end of the first connecting rod, and the other end of the first connecting rod is rotatably connected to the connecting block; The free end of the lifting hinge rod is rotatably connected to one end of the second connecting rod, and the other end of the second connecting rod is rotatably connected to the connecting block.

4. The linkage lift valve mechanism according to claim 3, characterized in that: The length of the rotating hinge rod, the length of the lifting hinge rod and the length of the first connecting rod are all equal, and the length of the second connecting rod is greater than the length of the first connecting rod.

5. The linkage lift valve mechanism according to claim 4, characterized in that: The rotating hinge rod is located at an upper side of the lifting hinge rod.

6. The linkage lift valve mechanism according to claim 5, characterized in that: Two sealing surfaces are also connected to the side of the valve plug. The two sealing surfaces are arranged opposite to each other and are offset by 90° relative to the through hole in the circumferential direction. In the closed state, the two sealing surfaces respectively close the first channel and the second channel.

7. The linkage lift valve mechanism according to claim 6, characterized in that: The connecting block is provided with a first rotating point and a second rotating point, wherein the first rotating point is located above the second rotating point, the first connecting rod is rotationally connected to the first rotating point, and the second connecting rod is rotationally connected to the second rotating point.

8. The linkage lift valve mechanism according to claim 7, characterized in that: The valve cavity, the first channel and the second channel form a cavity group, and two of the cavity groups are arranged in the valve body; The valve plug, the valve stem, the lifting mechanism, the rotating hinge rod, the first connecting rod and the second connecting rod together constitute a motion group, the number of the motion groups is two, and the two motion groups correspond to the two cavity groups respectively; The number of the connecting block is one, and the connecting block is connected to the two motion groups at the same time.

9. The linkage lift valve mechanism according to claim 8, characterized in that: The power mechanism is a hydraulic cylinder, and the hydraulic cylinder is connected to the connecting block.

10. The linkage lift valve mechanism according to any one of claims 2 to 9, characterized in that: The lifting mechanism further comprises a lifting nut, wherein the lifting nut is arranged in the lifting hinge rod, and the lifting nut is formed with the threaded hole, and the threaded hole is threadably matched with the threaded section.

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