Emergency cut-off valve for hazardous chemical substance transport vehicle
阅读说明：本技术 一种危化品运输车用紧急切断阀 (Emergency cut-off valve for hazardous chemical substance transport vehicle ) 是由 陈杰 黄崧 张学林 赵忠国 熊姝涛 王飞 杨林 李斌 于 2020-06-22 设计创作，主要内容包括：本发明属于阀门技术领域,具体涉及一种危化品运输车用紧急切断阀,包括切断阀主体,切断阀主体内部呈下大上小的阶梯状结构,切断阀主体一侧一体成型有支管,所示支管与切断阀主体内部相连通,切断阀主体下方固定安装有壳体,壳体内固定安装有弹性膜片,弹性膜片把壳体分为上下两个腔室,壳体下端面安装有进气管,滑动阀瓣上部的侧壁开设有若干第一侧孔,第一密封台上开设有过孔,提升阀杆穿设在过孔内,第一密封台上还开设有第二倾斜环槽,提升阀杆上端一体成型有第二密封台,第二密封台位于第二倾斜环槽内,断阀主体上方固定安装有第二过滤器。其目的是：解决紧急切断阀结构缺陷导致的使用麻烦的问题。(The invention belongs to the technical field of valves, and particularly relates to an emergency cut-off valve for a hazardous chemical transport vehicle, which comprises a cut-off valve main body, wherein the interior of the cut-off valve main body is of a stepped structure with a large lower part and a small upper part, a branch pipe is integrally formed on one side of the cut-off valve main body and is communicated with the interior of the cut-off valve main body, a shell is fixedly arranged below the cut-off valve main body, an elastic diaphragm is fixedly arranged in the shell and divides the shell into an upper cavity and a lower cavity, an air inlet pipe is arranged on the lower end face of the shell, a plurality of first side holes are formed in the side wall of the upper part of a sliding valve clack, a via hole is formed in a first sealing platform, a lifting valve rod is arranged in the via hole in a penetrating manner, a second inclined annular groove. The purpose is as follows: the problem of the use trouble that quick action emergency valve structural defect leads to is solved.)
1. The utility model provides a quick action emergency valve for hazardous chemicals transport vechicle which characterized in that: including trip valve main part (1), trip valve main part (1) is inside to be big end up's echelonment structure down, trip valve main part (1) one side integrated into one piece has branch pipe (11), and shown branch pipe (11) are linked together with trip valve main part (1) is inside, trip valve main part (1) below fixed mounting has casing (2), casing (2) internal fixation installs elasticity diaphragm (21), elasticity diaphragm (21) divide into two upper and lower cavities to casing (2), the intake pipe is installed to terminal surface under casing (2), casing (2) upper end fixed mounting has connector (22), casing (2) are through connector (22) and trip valve main part (1) fixed connection, fixed mounting has ejector pin (211) on elasticity diaphragm (21), integrated into one piece has a location section of thick bamboo on casing (2), ejector pin (211) are worn to establish in a location section of thick bamboo, be equipped with valve-stem nut (212) in the upper end of ejector pin (211) in trip valve main part (1), the spiro union has lifting valve rod (213) on valve-stem nut (212), fixed mounting has valve body (3) in trip valve main part (1), the inside echelonment structure that also is big end down of valve body (3), a plurality of through-holes (31) have evenly been seted up to the side of valve body (3) lower part, through-hole (31) are used for communicateing the inside and outside both sides of valve body (3), movable mounting has sealing spring seat (4) in valve body (3), sealing spring seat (4) are located valve-stem nut (212) top, on sealing spring seat (4) with lifting valve rod (213) fixed connection, fixed mounting has vice spring seat (5) in valve body (3), install first filter outer support (51) in vice spring seat (5), fixed mounting has first filter (52) on first filter outer support (51), fixed mounting has first filter inner support (53) on first filter (52), first filter inner support (53) slip cover is established on lifting valve rod (213), be equipped with main spring (40) between sealing spring seat (4) and vice spring seat (5), slidable mounting has slip valve clack (6) in vice spring seat (5) top in valve body (3), install vice spring (50) between vice spring seat (5) and slip valve clack (6), the pressure of main spring (40) is greater than the pressure of vice spring (50), slip valve clack (6) upper portion integrated into one piece has the cross-section to be first sealing bench (61) of big-end-up's trapezoidal form, first slope annular has been seted up on valve body (3), first sealing bench (61) are located first slope annular, a plurality of first side openings (60) have been seted up to the lateral wall on slip valve clack (6) upper portion, the via hole has been seted up on first sealed platform (61), promote valve rod (213) and wear to establish in the via hole, second slope annular has still been seted up on first sealed platform (61), promote valve rod (213) upper end integrated into one piece and have second sealed platform (62), second sealed platform (62) are located second slope annular, the fixed mounting of disconnected valve main part (1) top has second filter (10).
2. The quick action emergency valve for hazardous chemical substance transportation vehicle of claim 1, characterized in that: the middle part of the elastic membrane (21) is in an annular fold shape.
3. The quick action emergency valve for hazardous chemical substance transportation vehicle of claim 1, characterized in that: the lower end of the shell (2) is provided with a first threaded hole, and the first threaded hole is screwed with a fusible plug (7).
4. The quick action emergency valve for hazardous chemical substance transportation vehicle of claim 1, characterized in that: the lower end of the shell (2) is provided with a second threaded hole, and a quick air release mechanism (8) is screwed in the second threaded hole.
5. The quick action emergency valve for hazardous chemical substance transportation vehicle of claim 4, characterized in that: the lower end face of the shell (2) is integrally formed with a convex column, the second threaded hole is formed in the convex column and communicated with the interior of the shell (2).
6. The quick action emergency valve for hazardous chemical substance transportation vehicle of claim 5, characterized in that: the quick deflation mechanism (8) comprises an installation sleeve (81) and a fixing head (82), the installation sleeve (81) is of a hollow structure, the outer wall of the installation sleeve is provided with external threads matched with a second threaded hole, the fixing head (82) is screwed on the upper end of the installation sleeve (81), the installation sleeve (81) is internally provided with a compression spring (87), a plugging plug (83), a lifting head (84) and a pressing head (85) from top to bottom in sequence, the side wall of the installation sleeve (81) is uniformly provided with a plurality of second side holes (810) above the plugging plug (83), the lower end face of the plugging plug (83) is provided with a blind hole (831), the side wall of the plugging plug (83) is provided with a plurality of third side holes (830), the blind hole (831) is communicated with the third side holes (830), the plugging plug (83) is provided with a first annular groove above the third side holes (830), and a first sealing gasket (91) is installed in the first annular groove, the lower part of the inner wall of the mounting sleeve (81) is integrally formed with a ring sleeve set, the ring sleeve set is composed of a plurality of fan-shaped bosses (813) with inclined upper end surfaces, the inner wall of the ring sleeve set is axially provided with a plurality of first vertical grooves (811) and a plurality of second vertical grooves (812), the first vertical grooves (811) and the second vertical grooves (812) are arranged in a staggered mode at intervals, the sum of the number of the first vertical grooves (811) and the number of the second vertical grooves (812) is equal to the number of the fan-shaped bosses (813), the outer wall of the lifting head (84) is integrally formed with a plurality of second sliding blocks (840), the second sliding blocks (840) are positioned in the second vertical grooves (812), the thickness of the second sliding blocks (840) is larger than that of the first vertical grooves (811), the lower end surface of the lifting head (84) is provided with a plurality of first notches (841), the outer wall of the head (85) is integrally formed with a plurality of first sliding blocks (850), first slider (850) are located first perpendicular groove (811), a plurality of second breachs (851) have been seted up to press head (85) upper end face, the hole of losing heart (852) have been seted up to press head (85) lower extreme lateral wall.
7. The quick action emergency valve for hazardous chemical substance transportation vehicle of claim 6, characterized in that: an annular boss (842) is integrally formed on the outer wall of the upper end of the lifting head (84).
8. The quick action emergency valve for hazardous chemical substance transportation vehicle of claim 6, characterized in that: the utility model discloses a press device, including casing (2), articulated seat (860) is gone up to fixed mounting on casing (2), articulated on articulated seat (860) have and press piece (86), press piece (86) one end and press head (85) to touch and leave, the other end is located the casing (2) outside.
9. The quick action emergency valve for hazardous chemical substance transportation vehicle of claim 1, characterized in that: the external diameter size of slip valve clack (6) is less than the internal diameter size on valve body (3) upper portion, second annular groove has been seted up on first side opening (60) upper portion to slip valve clack (6) outer wall, install second sealing ring (92) in the second annular groove, second sealing ring (92) outer wall top is leaned on the inner wall on valve body (3) upper portion.
10. The quick action emergency valve for hazardous chemical substance transportation vehicle of claim 9, wherein: and a plurality of third gaps are further uniformly formed in the outer wall of the second sealing ring (92).
Technical Field
The invention belongs to the technical field of valves, and particularly relates to an emergency cut-off valve for a hazardous chemical transport vehicle.
Background
The security of road transportation of dangerous goods has been receiving attention from all countries in the world as a major issue concerning public safety of society. Because the dangerous goods have special physicochemical properties such as inflammability, explosiveness, corrosion, poison and the like, the dangerous goods in the road transportation process are equivalent to a flowing dangerous source, and once an accident occurs, huge economic loss, casualties and environmental pollution can be caused. In addition, due to the leakage, not only energy and materials are continuously lost, but also various toxic, harmful, corrosive, inflammable, explosive, high-temperature and high-pressure liquid media are continuously leaked, so that environmental pollution is caused, and fire, explosion, poisoning and personal casualty accidents are caused. Therefore, the development of dangerous goods emergency plugging technology is necessary.
On a dangerous goods transport vehicle, the most easily leaked part is a pipeline, and at present, an emergency cut-off valve is installed by a common means for preventing the pipeline from leaking.
The emergency cut-off valve on current hazardous articles transport vechicle adopts valve clack elevation structure, spring loading valve clack, and the valve relies on the protruding pole mechanism jack-up valve clack of handle, and realizes opening of valve, rotates the handle when closing, and the protruding pole breaks away from, and the valve clack relies on the elasticity pressure of spring to realize sealing on the valve clack. When the valve is opened and closed, the valve is completely turned by the handle, and the use is troublesome.
Disclosure of Invention
The purpose of the invention is: aims to provide an emergency cut-off valve for a hazardous chemical substance transport vehicle, which is used for solving the problem of troublesome use caused by the structural defects of the emergency cut-off valve.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
an emergency cut-off valve for hazardous chemical transportation vehicles comprises a cut-off valve main body, wherein the interior of the cut-off valve main body is of a stepped structure with a large lower end and a small upper end, a branch pipe is integrally formed on one side of the cut-off valve main body and is communicated with the interior of the cut-off valve main body, a shell is fixedly arranged below the cut-off valve main body, an elastic membrane is fixedly arranged in the shell and divides the shell into an upper cavity and a lower cavity, an air inlet pipe is arranged on the lower end face of the shell, a connector is fixedly arranged at the upper end of the shell, the shell is fixedly connected with the cut-off valve main body through the connector, an ejector rod is fixedly arranged on the elastic membrane and is integrally formed with a positioning barrel, the ejector rod is arranged in the positioning barrel, a valve rod nut is arranged at the upper end, the valve body is also of a stepped structure with a large lower part and a small upper part, a plurality of through holes are uniformly formed in the side surface of the lower part of the valve body and are used for communicating the inner side and the outer side of the valve body, a sealing spring seat is movably mounted in the valve body and is positioned above a valve rod nut, an auxiliary spring seat is fixedly connected with a lifting valve rod on the sealing spring seat, an outer first filter support is mounted in the auxiliary spring seat, a first filter is fixedly mounted on the outer first filter support, an inner first filter support is fixedly mounted on the first filter, the inner first filter support is slidably sleeved on the lifting valve rod, a main spring is arranged between the sealing spring seat and the auxiliary spring seat, a sliding valve clack is slidably mounted above the auxiliary spring seat in the valve body, and an auxiliary spring is mounted between the auxiliary spring seat and the sliding valve cla, the pressure of mainspring is greater than the pressure of auxiliary spring, slip valve clack upper portion integrated into one piece has the cross-section to be the first sealing platform of big-end-up's trapezoidal form, first slope annular has been seted up on the valve body, first sealing platform is located first slope annular, a plurality of first side openings have been seted up to the lateral wall on slip valve clack upper portion, the via hole has been seted up on the first sealing platform, it wears to establish downthehole to promote the valve rod, second slope annular has still been seted up on the first sealing platform, promotion valve rod upper end integrated into one piece has the second sealing platform, the second sealing platform is located second slope annular, disconnected valve main part top fixed mounting has the second filter.
Further, the middle part of the elastic membrane is in an annular corrugation shape. Due to the structural design, the elastic membrane with the annular corrugated structure provides enough deformation for the up-and-down movement of the ejector rod, the air pump can be reduced for inflating the lower chamber, the elastic membrane deforms to do work, and the practicability is high.
Further inject, first screw hole has been seted up to the casing lower extreme, the spiro union has the fusible plug in the first screw hole. By means of the structural design, when a fire disaster occurs, low-melting-point alloy in the fusible plug is melted at high temperature, gas in the lower cavity of the shell leaks from the fusible plug, the first sealing table and the second sealing table move downwards to respectively plug the first inclined ring groove and the second inclined ring groove, and therefore emergency cut-off of a pipeline is completed, and automatic cut-off of the emergency cut-off valve to the pipeline in the fire disaster is achieved.
Further limited, a second threaded hole is formed in the lower end of the shell, and a quick air release mechanism is connected in the second threaded hole in a threaded mode. Due to the structural design, when the pipeline needs to be cut off through the emergency cut-off valve in emergency when the air pump is damaged in emergency, the gas in the lower cavity of the shell can be released through the quick air release mechanism, so that the first sealing table and the second sealing table move downwards to respectively plug the first inclined ring groove and the second inclined ring groove, and the emergency cut-off of the pipeline is completed.
Further, the lower end face of the shell is integrally formed with a convex column, the second threaded hole is formed in the convex column, and the second threaded hole is communicated with the inside of the shell. Such structural design installs quick air bleeder through the second screw hole of seting up on the projection, can move down the holistic mounted position of quick air bleeder, reduces quick air bleeder and to the occuping of casing inner space, and then avoids quick air bleeder to the influence that elastic diaphragm's stroke caused.
Further limiting, the quick deflation mechanism comprises an installation sleeve and a fixed head, the installation sleeve is of a hollow structure, the outer wall of the installation sleeve is provided with external threads matched with a second threaded hole, the fixed head is screwed at the upper end of the installation sleeve, a compression spring, a sealing plug, a lifting head and a pressing head are sequentially arranged in the installation sleeve from top to bottom, a plurality of second side holes are uniformly formed in the side wall of the installation sleeve above the sealing plug head, a blind hole is formed in the lower end face of the sealing plug, a plurality of third side holes are formed in the side wall of the sealing plug, the blind hole is communicated with the third side holes, a first annular groove is formed in the sealing plug above the third side holes, a first sealing gasket is arranged in the first annular groove, a ring sleeve set is integrally formed at the lower part of the inner wall of the installation sleeve, the ring sleeve set is composed of a plurality of fan-shaped bosses with inclined upper ends, a plurality of first vertical grooves and a plurality, a plurality of first perpendicular groove and a plurality of second are erected the crisscross setting of groove interval, first perpendicular groove and second erect the number of the number in groove and equal to fan-shaped boss, the first outer wall integrated into one piece of lift has a plurality of second sliders, the second slider is located the second and erects the inslot, second slider thickness dimension is greater than the first thickness dimension who erects the groove, a plurality of first breachs have been seted up to the face under the lift, press head outer wall integrated into one piece has a plurality of first sliders, first slider is located first perpendicular inslot, a plurality of second breachs have been seted up to the press head up end, the hole of losing heart has been seted up to press head lower extreme lateral wall. By the structural design, when the rapid air release device is used normally, the second sliding block on the outer wall of the lifting head is positioned in the second vertical groove, the plugging plug abuts against the lifting head under the action of the compression spring, the second side hole and the third side hole are staggered, at the moment, the inside of the mounting sleeve is partitioned by the plugging plug, so that air in the shell cannot leak from the rapid air release mechanism, and the elastic membrane can work normally; when an emergency situation occurs, the pipeline needs to be cut off through the emergency cut-off valve, the air pump cannot work normally, when the lower chamber is deflated, the pressing head can be pressed upwards, the lifting head and the plugging plug are driven to move upwards through the pressing head until the second sliding block is separated from the second vertical groove, the lifting head rotates anticlockwise for a certain angle through the mutual matching of the first notch on the lifting head and the second notch on the pressing head, so that the second sliding block is staggered with the second vertical groove, the pressing of the pressing head is released at the moment, the lifting head moves downwards under the action of the compression spring until the second sliding block is contacted with the upper end face of the fan-shaped boss and slides downwards along the upper end face of the fan-shaped boss, and meanwhile, the anticlockwise rotation of a certain angle is continuously generated until the side face of the second sliding block abuts against the side wall of the next fan-shaped boss, at the moment, the lifting head is supported by the fan-shaped boss, the first sealing ring is positioned above the second side hole, the second side hole is communicated with the third side hole, and gas in the lower cavity of the shell leaks from the second side hole through the third side hole, the blind hole, the lifting head and the pressing head and the air leakage hole, so that the emergency cut-off of the pipeline is completed; after the cutting-off, when the cut-off valve needs to be opened again, the pressing head is pressed once again, so that the second sliding block on the outer wall of the lifting head slides in the second vertical groove again, the lower cavity of the shell is inflated again, the restart is convenient, and the quick deflation mechanism can be reused.
Further, the outer wall of the upper end of the lifting head is integrally formed with an annular boss. Such structural design through the mutual matching of annular boss and fan-shaped boss for when the second slider is located the second and erects the inslot, the lift head passes through annular boss and is supported by fan-shaped boss, prescribes a limit to the maximum distance that the lift head moved down.
Further inject, fixed mounting has articulated seat on the casing, it has the press block to articulate on the articulated seat, press block one end and press head touch from, the other end is located the casing outside. By means of the structural design, when the pressing head is required to be pressed, the pressing block can be indirectly pressed, the pressing head is indirectly pressed, and one end of the pressing block is located on the outer side of the shell, so that the pressing is convenient.
Further limiting, the outer diameter of the sliding valve clack is smaller than the inner diameter of the upper portion of the valve body, a second annular groove is formed in the upper portion of the first side hole of the outer wall of the sliding valve clack, a second sealing ring is installed in the second annular groove, and the outer wall of the second sealing ring abuts against the inner wall of the upper portion of the valve body. Due to the structural design, the abrasion caused by the direct hard contact between the sliding valve clack and the valve body can be avoided through the mutual matching of the second sealing ring and the inner wall of the upper part of the valve body.
Further limited, a plurality of third gaps are uniformly formed in the outer wall of the second sealing ring. Due to the structural design, the pressure of the sliding valve clack for sealing the upper part of the valve body is reduced through the third notch, so that the second sealing ring is more smoothly sealed, and the upper part of the valve body is completely sealed until the first sealing table is tightly abutted against the first inclined ring groove; during the in-service use, the second seal ring of seting up the third breach through the outer wall earlier carries out sealing to a certain extent to the valve body for flow between valve body and the slip valve clack reduces, and then reduces first seal platform when sealing valve body upper portion completely, and the flow in the valve body is to the impact of first seal platform, prolongs the life of first seal platform.
The invention adopting the technical scheme has the advantages that:
1. according to the emergency cut-off valve, the opening and closing control of the emergency cut-off valve is completed through the mutual matching of the elastic diaphragm, the air inlet pipe and the shell, the valve body length is reduced while the operation is convenient, and the elastic diaphragm, the air inlet pipe and the shell are detachably arranged on the cut-off valve main body, so that the maintenance and the replacement are convenient;
2. according to the invention, the two filters of the first filter and the second filter are used for filtering media passing through the sliding valve clack, the first sealing platform and the second sealing platform of the main moving part in two directions, so that impurities in the carbon steel tank body and the conveying pipeline are effectively prevented from contacting with the sliding valve clack, the first sealing platform and the second sealing platform, the sealing performance is prevented from being invalid, and the sealing energy efficiency is effectively prolonged;
3. the fusible plug is screwed on the shell, so that the emergency cut-off valve can automatically cut off a pipeline in case of fire, and the emergency cut-off valve is simple in structure, convenient to assemble and disassemble and higher in practicability;
4. when the emergency cutoff valve is used for emergently cutting off the pipeline under the condition that the air pump is damaged in an emergency, the gas in the lower cavity of the shell can be discharged through the rapid air discharging mechanism, so that the first sealing table and the second sealing table move downwards to respectively seal the first inclined ring groove and the second inclined ring groove, and the emergency cutoff of the pipeline is finished.
5. Through the mutual matching of the mounting sleeve, the fixing head, the sealing plug, the lifting head and the pressing head, the rapid deflation mechanism is simple to operate and only needs one simple press when deflating; when the cutoff valve is required to be opened again after being cut off, the lower cavity of the shell is inflated again only by pressing the pressing head once again, the restart is convenient, and the quick deflation mechanism can be reused.
Drawings
The invention is further illustrated by the non-limiting examples given in the accompanying drawings;
FIG. 1 is a schematic structural diagram of an embodiment of an emergency cut-off valve for a hazardous chemical transportation vehicle according to the present invention;
FIG. 2 is a schematic cross-sectional structural view of an embodiment of an emergency cut-off valve for a hazardous chemical transportation vehicle according to the present invention;
FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;
FIG. 4 is an enlarged view of the structure at B in FIG. 2;
FIG. 5 is a schematic structural diagram of a quick release mechanism portion in an embodiment of an emergency cut-off valve for a hazardous chemical transportation vehicle according to the present invention;
FIG. 6 is a schematic cross-sectional structural view of an installation sleeve part in an embodiment of an emergency cut-off valve for a hazardous chemical transportation vehicle according to the invention;
FIG. 7 is a schematic structural diagram of a lifting head and a pressing head in an embodiment of an emergency cut-off valve for a hazardous chemical transportation vehicle according to the present invention;
the main element symbols are as follows:
a shut-off valve body 1, a
A
A valve body 3, a through
A sealing spring seat 4, a
An
a sliding valve flap 6, a first side hole 60, a first sealing platform 61, a second sealing platform 62,
The fusible plug 7, the quick air release mechanism 8, the
A sealing plug 83, a blind hole 831, a third side hole 830,
A lifting head 84, a second sliding block 840, a first notch 841, an annular boss 842,
A
A
A first seal 91, and a second seal 92.
Detailed Description
The present invention will be described in detail with reference to the drawings and specific embodiments, wherein like reference numerals are used for similar or identical parts in the drawings or the description, and implementations not shown or described in the drawings are known to those of ordinary skill in the art. In addition, directional terms, such as "upper", "lower", "top", "bottom", "left", "right", "front", "rear", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present invention.
As shown in fig. 1 to 7, the emergency cut-off valve for hazardous chemical substance transport vehicles of the present invention comprises a cut-off valve main body 1, the interior of the cut-off valve main body 1 is a stepped structure with a large lower part and a small upper part, a branch pipe 11 is integrally formed on one side of the cut-off valve main body 1, the branch pipe 11 is communicated with the interior of the cut-off valve main body 1, a housing 2 is fixedly installed below the cut-off valve main body 1, an elastic diaphragm 21 is fixedly installed in the housing 2, the housing 2 is divided into an upper chamber and a lower chamber by the elastic diaphragm 21, an air inlet pipe is installed on the lower end surface of the housing 2, a connector 22 is fixedly installed on the upper end of the housing 2, the housing 2 is fixedly connected with the cut-off valve main body 1 through the connector 22, an ejector rod 211 is fixedly installed on the elastic diaphragm 21, a positioning cylinder is integrally, a valve body 3 is fixedly arranged in the cut-off valve main body 1, the interior of the valve body 3 is also of a stepped structure with a large lower part and a small upper part, a plurality of through holes 31 are uniformly formed in the side surface of the lower part of the valve body 3, the through holes 31 are used for communicating the inner side and the outer side of the valve body 3, a sealing spring seat 4 is movably arranged in the valve body 3, the sealing spring seat 4 is positioned above a valve rod nut 212, the sealing spring seat 4 is fixedly connected with a lifting valve rod 213, an auxiliary spring seat 5 is fixedly arranged in the valve body 3, a first filter outer support 51 is arranged in the auxiliary spring seat 5, a first filter 52 is fixedly arranged on the first filter outer support 51, a first filter inner support 53 is fixedly arranged on the first filter 52, the first filter inner support 53 is slidably sleeved on the lifting valve rod 213, a main spring 40 is arranged, install auxiliary spring 50 between auxiliary spring seat 5 and the slip valve clack 6, main spring 40's pressure is greater than auxiliary spring 50's pressure, 6 upper portion integrated into one piece of slip valve clack has the cross-section to be the first seal platform 61 of big-end-up's trapezoidal form, first slope annular has been seted up on valve body 3, first seal platform 61 is located first slope annular, a plurality of first side holes 60 have been seted up to the lateral wall on 6 upper portion of slip valve clack, the via hole has been seted up on first seal platform 61, it is downthehole that promote valve rod 213 wears to establish, second slope annular has still been seted up on first seal platform 61, promote valve rod 213 upper end integrated into one piece and have second seal platform 62, second seal platform 62 is located second slope annular, disconnected valve main part 1 top fixed mounting has second filter 10.
The middle part of the
The lower end of the
The lower end of the
A convex column is integrally formed on the lower end face of the
The quick deflation mechanism 8 comprises a mounting sleeve 81 and a fixing head 82, the mounting sleeve 81 is of a hollow structure, the outer wall of the mounting sleeve is provided with an external thread matched with a second threaded hole, the fixing head 82 is screwed at the upper end of the mounting sleeve 81, a compression spring 87, a plugging plug 83, a lifting head 84 and a pressing head 85 are sequentially arranged in the mounting sleeve 81 from top to bottom, a plurality of second side holes 810 are uniformly formed in the side wall of the mounting sleeve 81 above the plugging plug 83, a blind hole 831 is formed in the lower end face of the plugging plug 83, a plurality of third side holes 830 are formed in the side wall of the plugging plug 83, the blind hole 831 is communicated with the third side holes 830, a first annular groove is formed in the upper portion of the third side holes 830 of the plugging plug 83, a first sealing gasket 91 is arranged in the first annular groove, a ring sleeve group is integrally formed at the lower portion of the inner wall of the mounting sleeve 81, the ring group is formed by a plurality of fan-shaped bosses 813 with inclined upper, a plurality of first perpendicular grooves 811 and a plurality of second perpendicular groove 812 interval staggered arrangement, the sum of the number of first perpendicular groove 811 and second perpendicular groove 812 equals the number of fan-shaped boss 813, lift head 84 outer wall integrated into one piece has a plurality of second sliders 840, second slider 840 is located second perpendicular groove 812, second slider 840 thickness dimension is greater than first perpendicular groove 811's thickness dimension, a plurality of first breachs 841 has been seted up to lift head 84 lower terminal surface, press head 85 outer wall integrated into one piece has a plurality of first sliders 850, first slider 850 is located first perpendicular groove 811, a plurality of second breachs 851 has been seted up to press head 85 upper end, press head 85 lower extreme lateral wall has seted up out-of-leakage hole 852. When the rapid air release mechanism is used normally, the second sliding block 840 on the outer wall of the lifting head 84 is positioned in the second vertical groove 812, the sealing plug 83 abuts against the lifting head 84 under the action of the compression spring 87, the second side hole 810 and the third side hole 830 are staggered, at the moment, the inside of the mounting sleeve 81 is separated by the sealing plug 83, so that the air in the shell 2 cannot leak from the rapid air release mechanism 8, and the elastic diaphragm 21 can work normally; when an emergency situation occurs, the pipeline needs to be cut off through the emergency cut-off valve, the air pump cannot work normally, and when the lower chamber is deflated, the pressing head 85 can be pressed upwards, the lifting head 84 and the blocking plug 83 are driven by the pressing head 85 to move upwards until the second sliding block 840 is separated from the second vertical groove 812, the lifting head 84 rotates anticlockwise by a certain angle through the mutual matching of the first notch 841 on the lifting head 84 and the second notch 851 on the pressing head 85, so that the second sliding block 840 is staggered with the second vertical groove 812, the pressing on the pressing head 85 is released, the lifting head 84 moves downwards under the action of the compression spring 87 until the second sliding block 840 contacts with the upper end face of the fan-shaped boss 813 and slides downwards along the upper end face of the fan-shaped boss 813, and the rotation of a certain angle is continuously generated until the side face of the second sliding block 840 abuts against the side wall of the next fan-shaped boss 813, at this time, the lifting head 84 is supported by the fan-shaped boss 813, the first sealing ring 91 is positioned above the second side hole 810, the second side hole 810 is communicated with the third side hole 830, and the gas in the lower chamber of the housing 2 leaks from the second side hole 810 through the third side hole 830, the blind hole 831, the lifting head 84 and the pressing head 85 and from the gas release hole 852 to complete the emergency cut-off of the pipeline; after the cutting, when the cut-off valve needs to be opened again, the pressing head 85 is pressed again, so that the second slider 840 on the outer wall of the lifting head 84 slides into the second vertical groove 812 again, the lower chamber of the shell 2 is inflated again, the restart is convenient, and the quick deflation mechanism 8 can be reused.
An annular boss 842 is integrally formed on the outer wall of the upper end of the lifting head 84. By the matching of the annular protrusion 842 and the fan-shaped
The articulated
The outer diameter of the sliding valve clack 6 is smaller than the inner diameter of the upper part of the valve body 3, a second annular groove is formed in the upper part of the first side hole 60 on the outer wall of the sliding valve clack 6, a second sealing ring 92 is installed in the second annular groove, and the outer wall of the second sealing ring 92 abuts against the inner wall of the upper part of the valve body 3. Through the mutual cooperation of second sealing ring 92 and the upper portion inner wall of valve body 3, can avoid the wearing and tearing that sliding valve clack 6 direct and valve body 3 rigid contact caused.
A plurality of third notches are further uniformly formed in the outer wall of the second sealing ring 92. The pressure of the sliding valve clack 6 for sealing the upper part of the valve body 3 is reduced through the third gap, so that the second sealing ring 92 is more smoothly sealed until the first sealing table 61 is tightly propped against the first inclined ring groove, and the upper part of the valve body 3 is completely sealed; during the in-service use, offer the second sealing ring 92 of third breach through the outer wall earlier and carry out sealing to a certain extent to valve body 3 for flow between valve body 3 and the sliding valve clack 6 reduces, and then reduces first seal platform 61 when totally sealing up valve body 3 upper portion, and the impact of the flow in the valve body 3 to first seal platform 61 prolongs first seal platform 61's life.
In the embodiment, when the emergency cut-off valve is used, the emergency cut-off valve is arranged on the tank body, and the branch pipe is connected with the pipeline;
when the valve is normally used, a certain amount of gas is filled into the lower cavity of the
when the emergency cut-off valve is needed to cut off the pipeline, the lower cavity of the
The emergency cut-off valve for the hazardous chemical substance transport vehicle provided by the invention is described in detail above. The description of the specific embodiments is only intended to facilitate an understanding of the method of the invention and its core ideas. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
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