阅读说明：本技术 一种智能蝶阀 (Intelligent butterfly valve ) 是由 徐辉 于 2019-10-10 设计创作，主要内容包括：本发明公开了一种智能蝶阀,涉及蝶阀技术领域,包括阀体、阀杆和阀板,所述阀体内设有用于流体通过的阀孔,阀体上设有用于阀杆穿过的阀杆贯穿孔,阀板通过阀杆定位在阀孔内,阀杆带动阀板作正反转动,阀体内设有阀板转动限位机构,当阀板呈关闭状态时,阀板将阀孔分隔成进气腔和出气腔,所述阀杆包括轴套、上转轴和下转轴,所述轴套内设有一定位轴、一滑动轴和一回复弹簧,所述阀板和阀杆内设有至少一个阀板止转机构。本发明提出一种在阀板呈关闭状态时能够减小阀杆受到的切应力,同时能保障阀板不会发生破坏性翻转的智能蝶阀。(The invention discloses an intelligent butterfly valve, which relates to the technical field of butterfly valves and comprises a valve body, a valve rod and a valve plate, wherein a valve hole for fluid to pass through is formed in the valve body, a valve rod through hole for the valve rod to pass through is formed in the valve body, the valve plate is positioned in the valve hole through the valve rod, the valve rod drives the valve plate to rotate positively and negatively, a valve plate rotation limiting mechanism is arranged in the valve body, when the valve plate is in a closed state, the valve plate divides the valve hole into an air inlet cavity and an air outlet cavity, the valve rod comprises a shaft sleeve, an upper rotating shaft and a lower rotating shaft, a positioning shaft, a sliding shaft and a return spring are arranged in the shaft sleeve. The invention provides an intelligent butterfly valve which can reduce the shear stress on a valve rod when a valve plate is in a closed state and can ensure that the valve plate cannot be destructively overturned.)

1. An intelligent butterfly valve comprises a valve body (1), a valve rod (2) and a valve plate (3), wherein a valve hole (102) through which fluid passes is formed in the valve body (1), a valve rod through hole (101) through which the valve rod (2) passes is formed in the valve body (1), the valve plate (3) is positioned in the valve hole (102) through the valve rod (2), the valve rod (2) drives the valve plate (3) to rotate positively and reversely, a valve plate rotation limiting mechanism is arranged in the valve body (1), the rotatable angle of the valve plate (3) is 90 degrees, one rotation limit position of the valve plate (3) is that the valve plate (3) is perpendicular to the central axis of the valve hole (102), namely the valve plate (3) is in a closed state, and the other rotation limit position is that the central axis of the valve hole (102) is parallel to the valve plate (3), namely; when valve plate (3) are the closed condition, valve plate (3) are separated into air inlet chamber (103) and are given vent to anger chamber (104) with valve hole (102), its characterized in that:

the valve rod (2) comprises a shaft sleeve (201), an upper rotating shaft (202) and a lower rotating shaft (203),

the valve plate (3) is two semicircular plates which are symmetrically positioned at two opposite sides of the shaft sleeve (201) in the valve hole (102), and the shaft sleeve (201) drives the valve plate (3) to rotate; a first air inlet (204), a second air inlet (205) and a third air inlet (206) are formed in the shaft sleeve (201), when the valve plate (3) is in a closed state, the first air inlet (204) and the third air inlet (206) are located on one side of the air inlet cavity (103), and the second air inlet (205) is located on one side of the air outlet cavity (104);

the lower section of the upper rotating shaft (202) extends into an inner hole of the shaft sleeve (201), the upper section of the upper rotating shaft extends out of an upper opening of the shaft sleeve (201), and the upper rotating shaft (202) is in rotating seal fit with the inner hole of the shaft sleeve (201); an upper rotating shaft rotation limiting mechanism is arranged between the upper rotating shaft (202) and the shaft sleeve (201), the upper rotating shaft rotation limiting mechanism comprises a guide groove (207) arranged on the shaft sleeve (201) and a stop key (208) fixed on the upper rotating shaft (202), the guide groove (207) extends along the circumferential direction of the shaft sleeve (201), and the stop key (208) is positioned in the guide groove (207) and can move in the guide groove (207);

a first air passage (209) is arranged in the upper rotating shaft (202), an opening at one end of the first air passage (209) is positioned on the side wall of the upper rotating shaft (202), and an opening at the other end of the first air passage (209) is positioned on the lower end surface of the upper rotating shaft (202); when the upper rotating shaft (202) rotates towards the opening direction of the valve plate (3), the upper rotating shaft (202) and the shaft sleeve (201) rotate relatively, and the stop key (208) on the upper rotating shaft (202) moves to one side limit position in the guide groove (207) of the shaft sleeve (201), the opening of the first air channel (209) on the side wall of the upper rotating shaft (202) corresponds to and is communicated with the first air inlet (204); when the upper rotating shaft (202) rotates towards the closing direction of the valve plate (3), the upper rotating shaft (202) and the shaft sleeve (201) rotate relatively, and the stop key (208) on the upper rotating shaft (202) moves to the limit position of the other side in the guide groove (207) of the shaft sleeve (201), the opening of the first air channel (209) on the side wall of the upper rotating shaft (202) corresponds to and is communicated with the second air inlet (205);

the lower end of the lower rotating shaft (203) is fixed with the inner wall of the valve body (1), the upper section of the lower rotating shaft extends into an inner hole of the shaft sleeve (201), the lower rotating shaft (203) is in rotating sealing fit with the inner hole of the shaft sleeve (201), and the lower rotating shaft (203) is arranged opposite to the valve rod through hole (101);

a second air passage (210) is arranged in the lower rotating shaft (203), an opening at one end of the second air passage (210) is positioned on the side wall of the lower rotating shaft (203), and an opening at the other end of the second air passage (210) is positioned on the upper end surface of the lower rotating shaft (203); when the valve plate (3) is in a closed state, the opening of the second air channel (210) on the side wall of the lower rotating shaft (203) corresponds to and is communicated with the third air inlet (206);

a positioning shaft (4), a sliding shaft (5) and a return spring (6) are arranged in the shaft sleeve (201), the positioning shaft (4) is fixed on the inner wall of the shaft sleeve (201) and is positioned between the upper rotating shaft (202) and the lower rotating shaft (203), a vent channel (401) is arranged in the positioning shaft (4) and penetrates through the upper end surface and the lower end surface, the sliding shaft (5) is positioned between the positioning shaft (4) and the lower rotating shaft (203), the sliding shaft (5) can slide along the central axis of the shaft sleeve (201) and is in sliding sealing fit with an inner hole of the shaft sleeve (201), the diameter of one end, facing the positioning shaft (4), of the sliding shaft (5) is gradually reduced, and the sliding shaft extends to form a circular truncated cone guide part (501; the return spring (6) is arranged between the positioning shaft (4) and the sliding shaft (5);

at least one valve plate rotation stopping mechanism (7) is arranged in each of the valve plate (3) and the valve rod (2), each valve plate rotation stopping mechanism (7) comprises a sliding hole (701) arranged in each of the valve plate (3) and the valve rod (2) and a sliding rod (702) arranged in each sliding hole (701), each sliding hole (701) penetrates through the valve plate (3) and the valve rod (2), the central axis of each sliding hole (701) is perpendicular to the central axis of the valve rod (2) and parallel to the surface of the valve plate (3), the sliding rods (702) are in sliding sealing fit with the sliding holes (701), one end of each sliding rod (702) extends into an inner cavity of the shaft sleeve (201) and is abutted against the side wall of the circular truncated cone guide part (501) on the sliding shaft (5), the other end of each sliding rod can extend out of the arc-shaped side face of the valve plate;

the inner wall of a valve hole (102) of the valve body (1) is provided with a bolt hole (703) which can be inserted with the slide rod (702), and when the valve plate (3) is in a closed state, the slide rod (702) corresponds to the bolt hole (703).

2. The intelligent butterfly valve of claim 1, wherein: the valve rod retraction mechanism comprises a positioning ring (704) and a retraction spring (705), a containing groove (706) used for containing the positioning ring (704) and the retraction spring (705) is formed in the valve plate (3), the positioning ring (704) is coaxially positioned on the valve rod (2), the retraction spring (705) is sleeved on the valve rod (2), one end of the retraction spring (705) is abutted to the positioning ring (704), and the other end of the retraction spring is abutted to the inner wall of the containing groove (706).

3. The intelligent butterfly valve of claim 1, wherein: the valve body (1) is composed of an upper valve body and a lower valve body, and the upper valve body and the lower valve body are fixed through bolts.

4. An intelligent butterfly valve according to claim 1 or 3, characterized in that: a sealing ring (8) is attached to the inner wall of the valve hole (102) of the valve body (1), and a through hole is formed in the sealing ring (8) in a position corresponding to the bolt hole (703).

Technical Field

The invention relates to the technical field of butterfly valves, in particular to an intelligent butterfly valve.

Background

In fluid transport, when carrying natural gas, water or oil, often utilize the butterfly valve to come flow and switching in the control pipeline, it has the fast advantage of break-make speed, but it is when being the closed condition, the pressure of valve plate one side can be greater than the pressure of opposite side, can form a shear stress between valve rod and the valve rod through hole, and in the long past, easily cause the damage to the valve rod to, and, if valve plate both sides pressure differential is too big, cause the destructive upset of valve plate easily, influence the holistic sealing performance of butterfly valve and life.

Disclosure of Invention

In order to solve the problems, the invention provides an intelligent butterfly valve which can reduce the shear stress on a valve rod when a valve plate is in a closed state and can ensure that the valve plate cannot be destructively overturned.

In order to achieve the purpose, the invention adopts the following technical scheme: an intelligent butterfly valve comprises a valve body, a valve rod and a valve plate, wherein a valve hole for fluid to pass through is formed in the valve body, a valve rod through hole for the valve rod to pass through is formed in the valve body, the valve plate is positioned in the valve hole through the valve rod, the valve rod drives the valve plate to rotate forwards and backwards, a valve plate rotation limiting mechanism is arranged in the valve body, the rotatable angle of the valve plate is 90 degrees, one rotation limiting position of the valve plate is that the valve plate is perpendicular to the central axis of the valve hole, namely, the valve plate is in a closed state, and the other rotation limiting position is that the central axis of the; when the valve plate is in a closed state, the valve plate divides the valve hole into an air inlet cavity and an air outlet cavity,

the valve rod comprises a shaft sleeve, an upper rotating shaft and a lower rotating shaft,

the valve plate is two semicircular plates which are symmetrically positioned at two opposite sides of the shaft sleeve in the valve hole, and the shaft sleeve drives the valve plate to rotate; the shaft sleeve is provided with a first air inlet, a second air inlet and a third air inlet, when the valve plate is in a closed state, the first air inlet and the third air inlet are positioned on one side of the air inlet cavity, and the second air inlet is positioned on one side of the air outlet cavity;

the lower section of the upper rotating shaft extends out of an inner hole of the shaft sleeve, the upper section of the upper rotating shaft extends out of an upper opening of the shaft sleeve, and the upper rotating shaft is in rotary sealing fit with the inner hole of the shaft sleeve; an upper rotating shaft rotation limiting mechanism is arranged between the upper rotating shaft and the shaft sleeve, the upper rotating shaft rotation limiting mechanism comprises a guide groove arranged on the shaft sleeve and a stop key fixed on the upper rotating shaft, the guide groove extends along the circumferential direction of the shaft sleeve, and the stop key is positioned in the guide groove and can move in the guide groove;

a first air passage is arranged in the upper rotating shaft, an opening at one end of the first air passage is positioned on the side wall of the upper rotating shaft, and an opening at the other end of the first air passage is positioned on the lower end face of the upper rotating shaft; when the upper rotating shaft rotates towards the opening direction of the valve plate, the upper rotating shaft and the shaft sleeve rotate relatively, and the stop key on the upper rotating shaft moves to a limit position on one side in the guide groove of the shaft sleeve, the opening of the first air passage on the side wall of the upper rotating shaft corresponds to and is communicated with the first air inlet; when the upper rotating shaft rotates towards the closing direction of the valve plate, the upper rotating shaft and the shaft sleeve rotate relatively, and the stop key on the upper rotating shaft moves to the limit position on the other side in the guide groove of the shaft sleeve, the opening of the first air passage on the side wall of the upper rotating shaft corresponds to and is communicated with the second air inlet;

the lower end of the lower rotating shaft is fixed with the inner wall of the valve body, the upper section of the lower rotating shaft extends into an inner hole of the shaft sleeve, the lower rotating shaft is in rotating sealing fit with the inner hole of the shaft sleeve, and the lower rotating shaft and the through hole of the valve rod are oppositely arranged;

a second air passage is arranged in the lower rotating shaft, an opening at one end of the second air passage is positioned on the side wall of the lower rotating shaft, and an opening at the other end of the second air passage is positioned on the upper end surface of the lower rotating shaft; when the valve plate is in a closed state, the opening of the second air passage on the side wall of the lower rotating shaft corresponds to and is communicated with the third air inlet;

the positioning shaft is fixed on the inner wall of the shaft sleeve and positioned between the upper rotating shaft and the lower rotating shaft, a connecting air channel is arranged in the positioning shaft and penetrates through the upper end face and the lower end face, the sliding shaft is positioned between the positioning shaft and the lower rotating shaft, the sliding shaft can slide along the central axis of the shaft sleeve and is in sliding sealing fit with an inner hole of the shaft sleeve, the diameter of one end, facing the positioning shaft, of the sliding shaft is gradually reduced, and the sliding shaft extends to form a circular truncated cone guide part; the return spring is arranged between the positioning shaft and the sliding shaft;

the valve plate and the valve rod are internally provided with at least one valve plate rotation stopping mechanism, each valve plate rotation stopping mechanism comprises a slide hole arranged in the valve plate and the valve rod and a slide rod arranged in the slide hole, the slide hole penetrates through the valve plate and the valve rod, the central axis of the slide hole is vertical to the central axis of the valve rod and is parallel to the plate surface of the valve plate, the slide rod is in sliding sealing fit with the slide hole, one end of the slide rod extends into the inner cavity of the shaft sleeve and is abutted against the side wall of the circular truncated cone guide part on the slide shaft, the other end of the slide rod can extend out of the;

the inner wall of the valve hole of the valve body is provided with a bolt hole which can be inserted with the slide rod, and when the valve plate is in a closed state, the slide rod corresponds to the bolt hole.

Preferably, the valve rod retraction mechanism comprises a positioning ring and a retraction spring, a containing groove used for containing the positioning ring and the retraction spring is formed in the valve plate, the positioning ring is coaxially positioned on the valve rod, the retraction spring is sleeved on the valve rod, one end of the retraction spring is abutted to the positioning ring, and the other end of the retraction spring is abutted to the inner wall of the containing groove.

Preferably, the valve body is composed of an upper valve body and a lower valve body, and the upper valve body and the lower valve body are fixed through bolts.

Preferably, a sealing ring is attached to the inner wall of the valve hole of the valve body, and a through hole is formed in the sealing ring at a position corresponding to the bolt hole.

Therefore, the invention has the following beneficial effects: 1. the valve plate rotation stopping mechanism is arranged, so that the shearing stress on the valve rod can be reduced when the valve plate is in a closed state, meanwhile, the valve plate can be prevented from being destructively overturned, and the service life of the butterfly valve is prolonged; 2. setting the valve rod to rotate in two stages, initially rotating the upper rotating shaft when the butterfly valve is opened, unlocking the valve plate rotation stopping mechanism, and then continuously rotating the upper rotating shaft to drive the valve plate to rotate and open the butterfly valve; when closing the butterfly valve, the pivot in the initial rotation resets with going up the inside first air duct of pivot earlier, continues the rotatory pivot of going up again, drives the valve plate rotation and closes the butterfly valve, and simultaneously, the automatic trigger valve plate mechanism of splining, easy operation, degree of automation is high.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is an exploded view of the present invention.

Fig. 3 is a cross-sectional view of the present invention.

Fig. 4 is a sectional view taken in the direction of a-a in fig. 3.

Fig. 5 is a schematic view showing the structure of the butterfly valve when the upper rotary shaft is rotated in the valve plate opening direction and the stopper key on the upper rotary shaft is just moved to the limit position in the guide groove of the sleeve when the butterfly valve is opened.

Fig. 6 is a cross-sectional view of fig. 5.

Fig. 7 is a sectional view taken in the direction B-B in fig. 6.

Fig. 8 is a schematic view of the valve plate of the present invention after opening.

Fig. 9 is a cross-sectional view of fig. 8.

Fig. 10 is a sectional view taken in the direction C-C in fig. 9.

Fig. 11 is a schematic view showing the structure of the butterfly valve when the upper rotary shaft is rotated in the valve plate closing direction and the stopper key on the upper rotary shaft is just moved to the limit position in the guide groove of the sleeve when the butterfly valve is closed.

Fig. 12 is a sectional view of fig. 11.

Fig. 13 is a sectional view taken in the direction D-D of fig. 12.

Fig. 14 is a schematic view of the valve plate of the present invention after closing.

Fig. 15 is a cross-sectional view of fig. 14.

Fig. 16 is a sectional view taken in the direction of E-E in fig. 15.

1: a valve body; 101: a valve stem through hole; 102: a valve bore; 103: an air inlet cavity; 104: an air outlet cavity; 2: a valve stem; 201: a shaft sleeve; 202: an upper rotating shaft; 203: a lower rotating shaft; 204: a first air inlet; 205: a second air inlet; 206: a third air inlet; 207: a guide groove; 208: a shift key; 209: a first air passage; 210: a second air passage; 3: a valve plate; 4: positioning the shaft; 401: is communicated with an air passage; 5: a sliding shaft; 501: a circular truncated cone guide part; 6: a return spring; 7: a valve plate rotation stopping mechanism; 701: a slide hole; 702: a slide bar; 703: a pin hole; 704: a positioning ring; 705: a retraction spring; 706: a containing groove; 8: and (4) a sealing ring.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 16, the intelligent butterfly valve according to the embodiment includes a valve body 1, a valve rod 2 and a valve plate 3, the valve body 1 is composed of an upper valve body and a lower valve body, the upper valve body and the lower valve body are fixed through bolts, a valve hole 102 for fluid to pass through is arranged in the valve body 1, a valve rod through hole 101 for the valve rod 2 to pass through is arranged on the valve body 1, the valve plate 3 is positioned in the valve hole 102 through the valve rod 2, the valve rod 2 drives the valve plate 3 to rotate positively and negatively, a valve plate rotation limiting mechanism is arranged in the valve body 1, the valve plate rotation limiting mechanism can be a limiting stop strip arranged on the inner wall of the valve hole 102, the rotatable angle of the valve plate 3 is 90 degrees, one rotation limit position of the valve plate 3 is that the valve plate 3 is vertical to the central axis of the valve hole 102, namely, the valve plate 3 is in a closed state, and the other rotation limit position is that the central axis of the valve hole 102 is parallel to the valve plate 3, namely, the valve plate 3 is in an open state; when the valve plate 3 is in a closed state, the valve plate 3 divides the valve hole 102 into an intake chamber 103 and an exhaust chamber 104.

The valve rod 2 comprises a shaft sleeve 201, an upper rotating shaft 202 and a lower rotating shaft 203.

The shaft sleeve 201 vertically penetrates through the valve rod through hole 101 and is in rotary sealing fit with the valve rod through hole 101, the valve plate 3 is two semicircular plates and symmetrically positioned at two opposite sides of the shaft sleeve 201 in the valve hole 102, and the shaft sleeve 201 drives the valve plate 3 to rotate; the shaft sleeve 201 is provided with a first air inlet 204, a second air inlet 205 and a third air inlet 206, when the valve plate 3 is in a closed state, the first air inlet 204 and the third air inlet 206 are positioned on one side of the air inlet cavity 103, and the second air inlet 205 is positioned on one side of the air outlet cavity 104.

The lower section of the upper rotating shaft 202 extends out of an inner hole of the shaft sleeve 201, the upper section of the upper rotating shaft extends out of an upper opening of the shaft sleeve 201, and the upper rotating shaft 202 is in rotating sealing fit with the inner hole of the shaft sleeve 201; an upper rotating shaft rotation limiting mechanism is arranged between the upper rotating shaft 202 and the shaft sleeve 201, the upper rotating shaft rotation limiting mechanism comprises a guide groove 207 arranged on the shaft sleeve 201 and a stop key 208 fixed on the upper rotating shaft 202, the guide groove 207 extends along the circumferential direction of the shaft sleeve 201, and the stop key 208 is positioned in the guide groove 207 and can move in the guide groove 207.

A first air channel 209 is arranged in the upper rotating shaft 202, an opening at one end of the first air channel 209 is positioned on the side wall of the upper rotating shaft 202, and an opening at the other end is positioned on the lower end surface of the upper rotating shaft 202; when the upper rotating shaft 202 rotates towards the opening direction of the valve plate 3, the upper rotating shaft 202 and the shaft sleeve 201 rotate relatively, and the stop key 208 on the upper rotating shaft 202 moves to one side limit position in the guide groove 207 of the shaft sleeve 201, the opening of the first air channel 209 on the side wall of the upper rotating shaft 202 corresponds to and is communicated with the first air inlet 204; when the upper rotating shaft 202 rotates in the closing direction of the valve plate 3, the upper rotating shaft 202 and the shaft sleeve 201 rotate relatively, and the stop key 208 on the upper rotating shaft 202 moves to the other limit position in the guide groove 207 of the shaft sleeve 201, the opening of the first air passage 209 on the side wall of the upper rotating shaft 202 corresponds to and communicates with the second air inlet 205.

The lower extreme of lower pivot 203 is fixed with the inner wall of valve body 1, and the upper segment stretches in axle sleeve 201 hole, and lower pivot 203 and axle sleeve 201 hole rotary seal cooperate, and lower pivot 203 sets up with valve rod through hole 101 relatively.

A second air passage 210 is arranged in the lower rotating shaft 203, an opening at one end of the second air passage 210 is positioned on the side wall of the lower rotating shaft 203, and an opening at the other end is positioned on the upper end surface of the lower rotating shaft 203; when the valve plate 3 is in the closed state, the opening of the second air passage 210 on the side wall of the lower rotating shaft 203 corresponds to and communicates with the third air inlet 206.

A positioning shaft 4, a sliding shaft 5 and a return spring 6 are arranged in the shaft sleeve 201, the positioning shaft 4 is fixed on the inner wall of the shaft sleeve 201 and is positioned between the upper rotating shaft 202 and the lower rotating shaft 203, a ventilation channel 401 is arranged in the positioning shaft 4 and penetrates through the upper end surface and the lower end surface, the sliding shaft 5 is positioned between the positioning shaft 4 and the lower rotating shaft 203, the sliding shaft 5 can slide along the central axis of the shaft sleeve 201 and is in sliding sealing fit with the inner hole of the shaft sleeve 201, the diameter of one end, facing the positioning shaft 4, of the sliding shaft 5 is gradually reduced, and the diameter extends to form a circular truncated cone guide; the return spring 6 is arranged between the positioning shaft 4 and the sliding shaft 5.

Two valve plate rotation stopping mechanisms 7 are arranged in the valve plate 3 and the valve rod 2, the two valve plate rotation stopping mechanisms 7 are symmetrically arranged on two sides of the valve rod 2, each valve plate rotation stopping mechanism 7 comprises a sliding hole 701 arranged in the valve plate 3 and the valve rod 2 and a sliding rod 702 arranged in the sliding hole 701, the sliding hole 701 penetrates through the valve plate 3 and the valve rod 2, the central axis of the sliding hole 701 is perpendicular to the central axis of the valve rod 2 and is parallel to the plate surface of the valve plate 3, the sliding rod 702 is in sliding seal fit with the sliding hole 701, one end of the sliding rod 702 extends into the inner cavity of the shaft sleeve 201 and is abutted against the side wall of the circular truncated cone guide part 501 on the sliding shaft 5, the other end of the sliding rod can extend out of the arc-shaped side surface of the valve plate 3, a valve rod retraction mechanism is arranged in the valve plate 3 and comprises a positioning ring 704 and a retraction spring, a containing, the retraction spring 705 is sleeved on the valve rod 2, one end of the retraction spring 705 abuts against the positioning ring 704, and the other end abuts against the inner wall of the accommodating groove 706.

The inner wall of the valve hole 102 of the valve body 1 is provided with a bolt hole 703 which can be inserted with the slide bar 702, when the valve plate 3 is in a closed state, the slide bar 702 corresponds to the bolt hole 703, the inner wall of the valve hole 102 is adhered with a sealing ring 8, and a through hole is arranged on the sealing ring 8 corresponding to the bolt hole 703.

The invention is used for the natural gas pipe network:

when the butterfly valve needs to be opened, the upper rotating shaft 202 is rotated in the opening direction of the valve plate 3, and initially, the upper rotating shaft 202 and the shaft sleeve 201 rotate relatively, and the shaft sleeve 201 and the valve plate 3 do not rotate. The key 208 on the upper shaft 202 moves in the guiding groove 207 of the shaft sleeve 201 to a side limit position, as shown in fig. 5 to 7, at this time, the opening of the first air passage 209 on the side wall of the upper shaft 202 corresponds to and communicates with the first air inlet 204. The upper side of the sliding shaft 5 is communicated with the air inlet cavity 103 sequentially through the communicating air passage 401, the first air passage 209 and the first air inlet 204, the lower side of the sliding shaft 5 is also communicated with the air inlet cavity 103 sequentially through the second air passage 210 and the third air inlet 206, air pressures on the upper side and the lower side of the sliding shaft 5 are consistent, the sliding shaft 5 moves downwards in the direction of the lower rotating shaft 203 under the action of the return spring 6, the sliding rod 702 is acted by the retraction spring 705, one end of the sliding rod 702 is attached to the side wall of the circular table guide part 501 of the sliding shaft 5 to move relative to the circular table guide part 501 and approaches the small-diameter end of the circular table guide part 501, the sliding rod 702 retracts towards the valve rod 2 until the other end of the sliding rod 702.

The upper rotating shaft 202 is continuously rotated in the opening direction of the valve plate 3, the upper rotating shaft 202 drives the shaft sleeve 201 to rotate, the valve plate 3 rotates along with the shaft sleeve 201, and the valve plate 3 rotates 90 degrees, as shown in fig. 8 to 10, so that the operation of opening the butterfly valve is completed.

When the butterfly valve needs to be closed, the upper rotating shaft 202 is rotated in the closing direction of the valve plate 3, and initially, the upper rotating shaft 202 and the shaft sleeve 201 rotate relatively, and the shaft sleeve 201 and the valve plate 3 do not rotate. The key 208 on the upper shaft 202 moves in the guiding groove 207 of the shaft sleeve 201 to the other extreme position, as shown in fig. 11 to 13, at this time, the opening of the first air passage 209 on the side wall of the upper shaft 202 corresponds to and communicates with the second air inlet 205.

Continuing to rotate the upper rotating shaft 202 in the closing direction of the valve plate 3, the upper rotating shaft 202 drives the shaft sleeve 201 to rotate, the valve plate 3 rotates along with the shaft sleeve 201, and the valve plate 3 rotates by 90 degrees to complete the operation of closing the butterfly valve, as shown in fig. 14 to 15, at this time, the upper side of the sliding shaft 5 sequentially passes through the communicating air passage 401, the first air passage 209 and the second air inlet 205 to be communicated with the air outlet cavity 104, and the lower side sequentially passes through the second air passage 210 and the third air inlet 206 to be communicated with the air inlet cavity 103, because the valve plate 3 is in the closed state, the air pressure of the air inlet cavity 103 is greater than that of the air outlet cavity 104, the sliding shaft 5 moves towards the positioning shaft 4 under the action of the air pressure of the air inlet cavity 103 and compresses the return spring 6, one end of the sliding rod 702 abuts against the side wall of the circular truncated cone guide part 501 of the sliding shaft 5 to relatively move, and approaches the large-diameter end of the circular cone guide part 501, the sliding rod And a hole 703 for completing the operation of locking and stopping the rotation of the valve plate. At this moment, the sliding rod 702 not only can share the shear stress between the valve rod 2 and the valve rod through hole 101, prolong the service life of the butterfly valve, but also can effectively ensure that the valve plate 3 cannot be destructively overturned in the use process, and ensure the sealing property and the safety of the butterfly valve in the use process.