CN111465790B

CN111465790B - Curling type gas shutoff valve

Info

Publication number: CN111465790B
Application number: CN201880075230.0A
Authority: CN
Inventors: 刘建国; 姚朝胜; 姚航; 东佃军
Original assignee: Shandong Weike Environmental Protection Technology Co ltd
Current assignee: Shandong Weike Environmental Protection Technology Co ltd
Priority date: 2017-12-13
Filing date: 2018-12-11
Publication date: 2022-02-18
Anticipated expiration: 2038-12-11
Also published as: WO2019114671A1; CN111465790A; CN208619714U

Abstract

A kind of curly type gas stop valve, the valve core part of the valve is made up of the cut-off surface (2) that can be curly, flexible and stop the airstream from passing through and its bearing surface, reel (6), there are corresponding drive units that can make the reel rotate, make the cut-off surface (2) roll up on the reel (6), the change of the cut-off area size of the stop valve depends on what the cut-off surface of the valve core keeps out the wind and projected the surface and changes by curling, in the course of changing, there is no slippage between cut-off surface of the valve core and valve block frame.

Description

Curling type gas shutoff valve

The technical field is as follows:

the invention provides a curling type gas shutoff valve which is used for controlling airflow under the working conditions of low pressure, large flow and large circulation caliber.

Background art: the shutoff valve adopted by the prior art for controlling low-pressure and large-flow airflow is of a plugboard type, a butterfly board type, a turning board type, a cover-uncovering type, a louver type and the like, and has the common defects of large operation action space, large installed power, heavy weight and high manufacturing cost. Especially, under the working conditions that the pressure is not high, the flow area is large, but the use frequency is low, the investment benefit of using the valves is extremely low.

Taking the bag type dust collector as an example, in order to avoid affecting the normal production of the production line served by the whole dust collector when a single box body is overhauled, a gas shutoff valve is required to be arranged between each filter chamber and the gas inlet channel. The partition area between each filter chamber and the inlet air duct is typically 20-40 square meters, and the investment is too high in such a large area using the prior art shut-off valve, and the movement space of the valve core cannot be arranged. Therefore, the current technical proposal is that an air inlet channel with the flow area of 1-3 square meters is arranged between the lower part of the air inlet channel and the lower part of each filter chamber, and a small-caliber intercepting valve is arranged on the air inlet channel to realize the purpose of reducing investment. However, the above prior art has the following problems:

firstly, the air flow speed is high, the resistance is large and the operation cost is high due to the selection of the shutoff valve with a small diameter.

Thirdly, the high-speed airflow passing through the shutoff valve is not easy to be uniformly distributed, and the service life of the filter bag is influenced by washing the filter bag.

And thirdly, the airflow enters the filter chamber from the lower part completely, so that the airflow moves upwards completely, the dust which is cleaned during ash removal is not facilitated to be settled to the ash hopper and sucked back to the outer surface of the filter bag, so that the secondary dust raising which is called by the industry is caused, and the operation cost is increased.

And fourthly, as the air flow enters the filtering space only from the bottom of the filtering chamber, (the filtering space refers to the sum of the space occupied by all the filtering bags in the filtering chamber and the space occupied by the gaps of all the adjacent filtering bags). The spacing between the filter bags is inevitably increased under the limit of the critical air speed between the filter bags (the maximum working condition air speed which does not cause scouring wear to the filter bags), so that the investment of unit filter area is increased, and the investment of the whole dust remover is also increased.

The bag-type dust removal technology has been used for more than 200 years, and the problems are not solved. For example, document No. 201521041739.3 discloses a bag house offline valve, and document No. 201820212836.1 discloses a low pressure pulse bag house pulse blowback offline valve, which is similar in basic terms to the prior art low pressure atmospheric flow shut-off valves that have been formed for hundreds of years. The same is true of numerous other patent applications in this respect, which fail to solve the above-mentioned problems. In virtually all other fields, this is the case for low pressures, high flows, large flow areas, and the need for gas shut-off valves.

In view of the above, the present invention provides a novel, convoluted gas shutoff valve that employs a mechanical principle that is distinct from the prior art.

The invention content is as follows:

the present invention is directed to overcoming the above-mentioned deficiencies of the prior art by providing a novel gas shut-off valve.

The invention provides a curling type gas shutoff valve, which comprises a valve core and a valve body and is characterized in that: the valve core comprises a cut-off surface, a supporting surface and a cut-off surface curling device, and the cut-off surface can curl; in the operating state, one end of the cut-off surface is fixed on the structure which is relatively static with the supporting surface, and the other end is directly or indirectly fixed on the reel of the cut-off surface curling device.

The present invention provides a new-type gas shutoff valve, and is characterized by that the valve core portion of said valve (in this case, the valve core refers to the portion in the valve body of said valve, and the valve body refers to the portion which is connected with gas channel or chamber and can be formed into partial gas channel) is formed from flexible shutoff surface capable of being curled, and can be made into the gas-tight state as far as possible and can prevent gas flow from passing through, and its supporting surface and shutoff surface curling device. The closure surface refers to a component used for closure in the valve core component, and the material of the component can be various fabrics, also can be glued fabrics, also can be various chemical materials, also can be a metal material, and also can be a combination of the materials and the transverse support rib. These materials all have certain tensile strength and gas impermeability characteristics. Other characteristics, such as high temperature resistance, corrosion resistance and the like, can be determined according to the requirements of the working condition environment of a specific project.

The supporting surface is composed of a supporting surface frame or composed of a supporting frame and supporting ribs and/or a supporting rib net fixed on the supporting frame. The supporting ribs and/or the supporting rib nets are arranged on a plane defined by the supporting frame, the supporting ribs and/or the supporting rib nets form meshes in the plane defined by the supporting frame, and the hole diameter of the part close to the supporting frame is properly reduced so as to reduce the influence of excessive deformation of the intercepting surface on sealing between the intercepting surface and the supporting surface frame under the action of air pressure. When the flow area enclosed by the supporting frames of the supporting surface is smaller, the supporting ribs and/or the supporting rib nets can be omitted. The size and the shape of the outer contour of the supporting surface are consistent with the inner contour of a box body, a bin body or a pipeline installation position which is also used as a valve body, and the supporting surface is manufactured into a whole and generally welded.

The intercepting surface is made of flexible materials and cannot independently bear the pressure of intercepted gas, the supporting surface is used for supporting the intercepting surface, when the intercepting surface is in a closed state, the intercepting surface bears larger gas pressure and transmits the larger gas pressure to the supporting ribs and/or the supporting rib net of the supporting surface, and the supporting ribs and/or the supporting rib net have certain rigidity and then transmits the certain rigidity to the shell through the supporting frame.

The intercepting surface and the supporting surface are attached to each other under the action of gas pressure to complete the intercepting function, so that in the mounting position, the intercepting surface is arranged on the pressure bearing side of the supporting surface after the gas flow is stopped and is mounted close to the pressure bearing side. The shape of the cross-sectional surface is determined according to the profile shape of the through-flow holes surrounded by the frame of the support surface (the through-flow holes are generally rectangular), and the profile size of the cross-sectional surface is larger than that of the through-flow holes surrounded by the frame of the support surface, and is generally 100 mm and 300mm, but not limited thereto. The overlapped parts are pressed by airflow during working, the interception surface can be tightly attached to the supporting surface to achieve the sealing effect, and the airflow can be effectively prevented from passing through.

The cutoff surface curling device consists of a scroll and a supporting seat or consists of a scroll and a grooved wheel and is used for curling or releasing the cutoff surface. One end of the intercepting surface is fixed on the scroll, the scroll is dragged to rotate through a power transmission device of the scroll, the intercepting surface can be wound on the scroll layer by rotating towards a certain direction, and the intercepting surface is released from the scroll by rotating towards the other direction. The reel can be a rigid ironware, can also be a polyester plastic product, and the like, different materials are selected according to different use working conditions, and the rotating surface of the reel, which is in contact with the intercepting surface, is smooth, and has no burrs or plastic slag.

The power transmission device of the scroll drives the scroll to rotate, so that the cut-off surface is rolled on the scroll, hereinafter referred to as rolling, or the cut-off surface rolled on the scroll is released and separated from the scroll, hereinafter referred to as unreeling. The power transmission device of the reel can be various devices capable of completing rotation transmission, such as various prime movers like motors or motors, various transmission machines like tooth transmission, chain transmission, belt transmission and rod transmission, and also various tooth transmission, chain transmission, belt transmission and rod transmission of manual power. These prime movers and transmissions are well established technologies and power transmission components are readily available or readily manufactured on the market, and those skilled in the art will understand and appreciate these general techniques and will not be described in detail herein. The power transmission devices of the reels can be arranged in the box body, the bin or the pipeline, and can also be arranged outside partially or completely to facilitate the monitoring of the state and the maintenance of the reel.

The scheme is further characterized in that: the size that prior art shut-off valve opened is realized through the valve core face rotation or is taken away. The disadvantage of the rotation is that it takes up a lot of space and the disadvantage of the extraction is that it generates a great friction. The opening size of the curled type shutoff valve is realized by curling the shutoff surface of the valve core, namely, the area of the shutoff surface of the valve core for blocking air flow is increased or decreased by curling. Not occupying space and generating friction force.

The curled shutoff valve provided by the scheme is in a working state (the working state refers to any other state except for the shutoff surface during replacement, and the shutoff surface belongs to the working state when being in an opening state, a closing state and a semi-opening state). One end of the cut-off surface is fixed on a structure which is relatively static with the supporting surface, and the other end is fixed on a scroll of the cut-off surface curling device. This is an important feature of the present technology that distinguishes it from existing roll-up doors or roll-up window coverings. The present invention relates to a rolling door or a rolling curtain, wherein one end of a rolling surface of the existing rolling door or rolling curtain is connected with a rolling shaft, and the other end of the rolling surface is a free end and is not fixed on a static structure. The roll surface is wholly slipped when being curled, and if the roll surface is used as a shutoff valve, the roll surface can not be slipped to open and close due to huge friction force. Even if the valve can be opened and closed under the action of large external force, the cut-off surface can be worn and damaged quickly. According to the characteristics of the technology, the interception surface is gradually spread on the supporting surface in the valve closing process until all the through holes are covered; the cut-off surface is continuously rolled on the supporting surface to be separated from the supporting surface in the valve opening process, and no sliding and no abrasion exist between the cut-off surface and the supporting surface in the opening or closing process. The difference in this technical feature is due to the difference in mechanical principle, i.e. the mechanical principle used to change the interception projection surface is fundamentally different from the prior art. The advantages and disadvantages are also very different. The former has a translation section, the opening and closing of the valve body require huge external force to cause serious abrasion, the latter has no translation when being spread or rolled up, and the opening or closing requires little external force to cause almost no abrasion.

The structure that one end of the intercepting surface is fixed on is a suspension structure which is connected with one end of at least one rope, the suspension structure is connected with one end of at least one rope, the other end of the rope can be connected with a suspension structure roller which is arranged outside the box body and dragged by a power transmission device of the suspension structure through a pulley block or directly penetrates through the box body, and the rope is called as a suspension structure rope hereinafter. The power transmission device of the suspension structure can be a transmission device of an electric prime motor and a transmission machine, and can also be an operation device manually operated by hand. Because the frequency of use is lower, the investment benefit is lower, recommends here to use hand cranking device. The suspension structure of above-mentioned setting has the function of going up and down, and its purpose can wholly promote and be fixed in its operating position in order to make the damming surface, also can wholly descend, changes through the manhole. The structure of the steel can be square steel, I-shaped steel, channel steel, H-shaped steel or combined steel structure and the like.

The crimped shutoff valve of the present technology has single and double layer forms, described separately below:

the double-layer form is characterized in that: one side of the cross-sectional surface is fixed on the upper part of the supporting frame or the adjacent shell by a screw or an adhesive or a batten, and the other opposite side is fixed on the scroll. The reel is fixed on the upper part of the frame of the supporting surface or a shell close to the frame of the supporting surface through a fixing device. The fixing device can be a common component which is easy to disassemble and replace, such as a bearing seat (hereinafter referred to as a reel supporting seat). The scroll can be fixed through the scroll supporting seat, and the scroll supporting seat can be fixed in frame upper portion, or fix on the roof of its nearly case, storehouse, pipe. A counterweight roller is arranged at the U-shaped inner bottom formed by the drooping cross-section surface between the edge of the cross-section surface fixed on the upper part of the frame of the supporting surface and the edge fixed on the scroll, the counterweight roller is a rigid cylinder with a certain weight, and the rotating surface of the counterweight roller, which is contacted with the cross-section surface, is smooth and has no burrs. Such crimped shut-off valves are commonly used in air-purifying chambers. When the reel is partially or completely unwound, the intercepting surface is in a U shape when viewed from the side end, namely when viewed in a direction parallel to the intercepting section, two straight edges of the U shape are vertical double-layer intercepting surfaces, and the counterweight roller arranged on the inner side of the bottom of the U shape ensures the verticality when the intercepting surface is lifted. This counterweight roll can be omitted if the shut-off surface itself has this effect. Between the formed double-layer intercepting surfaces, the intercepting surface is divided into two parts by the counterweight roller, and the part close to the supporting surface is an intercepting side; the traction side is arranged between the reel and the counterweight roller, and the traction side does not participate in the intercepting work and only performs traction on the other side. The winding type shutoff valve has three working positions during working, wherein one working position is a full-opening working position of the valve, namely, the winding degree of a winding shaft reaches the position that a U-shaped bottom is lifted above the highest edge of a through-flow hole; secondly, a valve is fully closed, namely the reel rotates and unreels to a position (generally 100-; at this time, the air purifying chamber is in an off-line working state. And the third is a valve partial closing station, namely the U-shaped bottom is positioned in the middle area of the through-flow aperture, and is in a partially closed state and a partially opened state. In order to ensure the sealing effect, the flow-stopping surface covers the through-flow hole fully when the valve is in the fully closed position, and the periphery of the flow-stopping surface is larger (generally 100 mm and 300 mm). In order to prevent the intercepting surface from deviating when being wound on the scroll, at least one stop block can be arranged on the left and right outside the width of the intercepting surface of the valve body frame, a certain gap is reserved between the stop block and the intercepting surface, and the abrasion between the intercepting surface and the stop block or the rail is reduced; or the two ends of the counterweight roller are provided with rims, and the corresponding positions on the two sides of the frame of the supporting surface are respectively provided with a counterweight roller track to limit and guide the movement of the counterweight roller. The reel is connected with a hand-operated device or a power transmission device to roll up or release the intercepting surface. Hand cranking device or power transmission connect to be fixed inside the box or outside, if need often carry out off-line when jetting, recommend using power transmission, if use frequency is less, recommend using hand cranking device, its cost is lower, and impaired risk is lower.

The three stations of the stop valve realize winding or unwinding of the reel through the change of the turning direction of the reel transmission device, namely the opening and closing of the stop surface. And (4) unwinding the reel, namely, closing the valve. In contrast, reel spooling is the process of valve opening.

The single-layer form is characterized in that: in the working state, one end of the intercepting surface is fixed on the structure which is relatively static with the supporting surface, and the other end of the intercepting surface is fixed on the scroll. The reel is enclosed by two reel ropes which are in a U shape, and one end of each of the two reel ropes close to the side of the supporting surface is directly fixed on the upper part of the frame or the structures of a box, a bin, a pipe and the like close to the upper part of the frame or fixed through a pulley block fixed on the structure of the frame. The other end of each is guided by a pulley block which can be arranged and then is dragged or released by a reel transmission device. The reel is provided with a proper weight or an additional balance weight, and rotates along with the traction or the release of the two U-shaped reel ropes, and moves up and down simultaneously. When the reel transmission device releases the reel rope, the reel rotates and descends to realize unreeling, namely the process of closing the cut-off valve. On the contrary, when the reel transmission device pulls the reel rope, the reel rotates and rises to realize winding, namely the process of opening the shutoff valve.

In order to prevent the two reel ropes from axially moving on the reels, grooved wheels can be arranged at the two ends of the reels, the reel ropes are clamped in the grooved wheels, and the grooved wheels and the reels are fixed into a whole and synchronously rotate. Each of which is hung by a reel rope around the sheave thereof; one end of each reel rope is fixed on the upper part of the support surface frame or a shell close to the support surface frame or connected to the suspension structure, and the other end of each reel rope is connected to a reel lifting roller dragged by the reel transmission device or connected to the reel lifting roller dragged by the reel transmission device through a reel rope fixed pulley fixed on the suspension structure. The reel rope can circumferentially slide in the wheel groove. This structure is single-layered as viewed from the side of the flow-intercepting surface.

The invention also provides a bag type dust collector which comprises any one of the curled shutoff valves of the bag type dust collector.

The crimp-type shut-off valve has a number of advantages, and in particular it can be adapted to any large aperture to be shut off. Take a bag filter as an example: by using the outstanding advantage, the whole side surfaces of the dust side box chamber and the clean side box chamber can be provided with the through flow holes for airflow on the premise of having the function of intercepting the flow. At present, the bottom air intake mode is mostly adopted in the prior art, and the curling type throttle valve can change the bottom air intake mode in the prior art into a bottom air intake and side air intake mode. Such an improvement would also provide the following benefits: the area of the through hole is increased, the airflow resistance is reduced, the intercepting caliber of the air inlet is generally increased from 1-2 square meters to 18-30 square meters, the intercepting area of the air outlet is increased from 1-2 square meters to about 1.5-10 square meters, and the resistance is reduced by more than 80 percent; the air flow speed of the air inlet is reduced by more than 90 percent. Under the same working condition, the air flow distribution is facilitated, and the bag is protected from being abraded; compared with the prior art, the bottom air inlet and side air inlet of the scheme have the economic effect of realizing filter bag dense distribution. If the same air speed between the bags is set, more filter bags can be arranged in the same box body, or the box body can be greatly reduced under the same filtering area. The cost is reduced. In addition, the gas inlet mode improves the running route of gas in the dust remover, the running route is shortened by 40-45%, the number of right-angle bends is reduced from 6 to 4, and the resistance is reduced by about 4%; the overflowing section of the air inlet chamber is doubled, and the airflow resistance of the air inlet chamber is reduced by more than 7%; the volume of the air inlet chamber is increased by 1-3 times, the gas flow rate is greatly reduced, so that the air inlet chamber has the function of a settling chamber, large-particle dust can settle in the settling chamber, the time of internal and external pressure difference required when the filter bag reaches the ash removal condition is shortened, the ash removal times and energy consumption are reduced, the use amount of ash removal compressed air is saved by 20-40%, the service life of a pulse valve is prolonged by 20-40%, and the service life of the filter bag is prolonged by 20-30%; the integral dust removal efficiency is greatly improved; the bottom air inlet and side air inlet mode overcomes the defects that the bottom air inlet and dust removing fall directions are opposite, and the dust is not settled in time due to negative pressure formed by the filter bag after the blowing is finished, so that the secondary dust raising is caused to a certain extent; the defect that the bag is not suitable for long bags or dense distribution due to the limitation of air speed between the bag bottom bags of bottom air inlet is overcome; the installed power capacity of the air inlet and outlet shutoff valve is reduced by 70-80%; the investment of the air inlet and outlet shutoff valve is reduced by 50-60%.

Drawings

FIG. 1: the curled type cut-off valve is a schematic diagram in a double-layer form.

FIG. 2: the curled type shutoff valve has a single-layer non-suspension structure.

FIG. 3: schematic diagram of a single-layer crimped shut-off valve with a suspended structure for a duster.

Wherein: 1-valve body 2-flow-cutoff surface 3-supporting surface frame 4-support rib 5-counterweight roller 6-scroll 7-fixing device 8-scroll transmission device 9-stop block 10-scroll rope 11-grooved pulley 12-flow-cutoff surface traction section 13-scroll support seat 14-air outlet chamber 15-air inlet chamber 16-suspension structure fixed pulley 17-scroll rope fixed pulley 18-suspension structure transmission device 19-suspension structure 20-suspension structure roller 21-scroll lifting roller 22-suspension structure rope 23-pattern plate 24-filter chamber 25-filter bag 26-air purifying chamber.

The specific implementation scheme is as follows:

the following is an exemplary detailed description of the invention, but is not limited thereto.

Example 1

Belonging to the double-layer form of the curled shutoff valve. As shown in fig. 1, a support surface frame 3 is welded in a valve body 1 (a part of an airflow channel), a support rib 4 is welded in the frame, the support rib 4 can also be used as an airflow distribution plate, and the size of the outer contour of the support surface frame 3 is consistent with the size of the inner contour of the valve body 1 and is welded on the valve body 1. The width and height of the interception surface 2 made of the airtight glued fabric material are both larger than the through-flow hole 100 + 300mm surrounded by the support surface frame 3, one side of the interception surface is fixed on the upper part of the support surface frame 3 by a fixing device 7, (specifically, the top edge of the fabric of the interception surface 2 can be clamped by fabric clamping strips made of cold-bending steel strips, then the clamping strips are fixed on the upper part of the support surface frame 3 by screws), and the other side opposite to the interception surface 2, namely, the interception surface traction section 12 is fixed on the scroll 6 by glue. The two ends of the scroll 6 are fixed on a scroll support base 13 through bearings, and the scroll support base 13 is fixed on the upper part of the support surface frame 3 through screws. The transmission end of the scroll 6 is provided with a bevel gear which is connected with a scroll transmission device 8 such as a speed reducer, a motor and the like which are arranged outside the valve body 1. The shut-off surface 2 thus forms a naturally sagging "U" shape when viewed from the side. And a counterweight roller 5 is arranged at the bottom of the inner side of the U-shaped part. The counterweight roller 5 is cylindrical and has a certain weight, and the two sides are provided with rims to prevent the counterweight roller from deviating during movement. The cutoff surface 2, the fixing device 7, the scroll 6 and the scroll supporting seat 13 are all arranged on the high-pressure side of the through-flow hole of the plane defined by the supporting surface frame 3 and the supporting ribs 4 and are arranged close to the high-pressure side of the through-flow hole. Two free outer edges of the interception surface 2 perpendicular to the ground are provided with a pair of stop blocks 9 fixed on the support surface frame 3 at a height close to the reel 6, and the stop blocks 9 play a limiting and guiding role on the two free outer edges of the interception surface to ensure that the interception surface is wound on the reel 6 regularly and orderly. If the motor is set to rotate forwards, the reel 6 is unreeled, the counterweight roller 5 descends under the action of gravity and drives the intercepting surface 2 to continuously spread so as to enlarge the intercepting area, and the valve can be completely closed to the maximum extent. On the contrary, the motor rotates reversely, the reel 6 is wound, the interception surface 2 is continuously lifted to reduce the interception area, the valve can be finally opened fully, and the counterweight roller 5 can always maintain the interception surface 2 in a tensioning state by the weight of the counterweight roller in the process of continuously spreading and lifting the interception surface 2. In order not to cause the shut-off surface 2 to move beyond the upper and lower limit positions when retracted and deployed, it can be controlled by proximity switches provided inside or outside the valve, or by motor encoders.

Example 2

Belonging to the single-layer form of the crimped shut-off valve and used in a bag house. As shown in fig. 3, the bag-type dust collector is composed of an air inlet chamber 15, a filter chamber 24, an air purifying chamber 26, an air outlet chamber 14 and the like, a filter bag 25 is arranged in the filter chamber 24, and a curled shutoff valve is arranged between the filter chamber 24 and the air inlet chamber 15. The filtered air flow firstly enters the air inlet chamber 15, enters the filter chamber 24 through the curled cut-off valve, then passes through the filter material to enter the filter bag 25, moves upwards to enter the air purifying chamber 26 through the flower plate 23, and then leaves from the air outlet chamber 14. The single-layer curled shutoff valve is arranged between the bag type dust collector filtering chamber 24 and the air inlet chamber 15, the size of the outer contour of the supporting surface frame 3 is generally consistent with the inner contour of the dust collector filtering chamber 24 which is also used as the valve body 1, and the supporting surface frame is welded on the corresponding position of the dust collector filtering chamber 24. The plane enclosed by the support surface frame 3 is internally provided with support ribs 4, the cross-section surface 2 is made of airtight gluing fabric materials, and the width and the height of the cross-section surface are both larger than the flow holes 100 and 300mm enclosed by the support surface frame 3. The intercepting surface 2 is fixed on one side to a suspension structure 19 by means of a fixing device 7 and on the opposite side to a reel 6 by means of glue, the reel 6 is enclosed by two reel ropes 10 which are "U" shaped as seen from a direction parallel to the intercepting surface, and a reel rope fixed pulley 17 carrying the "U" shaped reel ropes 10 is fixed to the suspension structure 19. The reel rope 10 is fixed at one end to the suspension structure 19 and at the other end to a reel lifting drum 21 arranged outside the hopper below the filtering chamber 24. The hanging structure 19 is hung on the pattern board 23 through the hanging structure fixed pulley 16, one end of the hanging structure rope 22 is connected with the hanging structure 19, and the other end is connected with the hanging structure roller 20 which is arranged outside the ash hopper at the lower part of the filtering chamber 24 through the hanging structure fixed pulley 16. The suspension structure 19 moves up and down under the guidance of the suspension structure fixed pulley 16 and the traction of the suspension structure rope 22, and the suspension structure 19 and the cut-off surface 2 which fall down can be transmitted to the outside of the valve body 1 through the access hole for replacement. The reel 6 is welded with grooved wheels 11 at both ends, a reel rope 10 is arranged in the grooves, and the flanges of the grooved wheels 11 play a role in limiting and guiding the reel rope 10. When the reel lifting drum 21 unwinds the reel rope 10, the reel 6 is unwound, and the reel 6 having a proper weight is rotated and lowered by gravity. (additional weighting if the reel 6 is not heavy enough) the shut-off surface 2 continues to spread out and the shut-off area becomes larger, at the maximum the valve can be fully closed. On the contrary, if the reel 6 is rolled, the cut-off surface 2 is continuously rolled up to reduce the cut-off area, and finally the valve can be fully opened. The control is the same as above.

Claims

1. A curling gas shutoff valve of a bag type dust collector comprises a valve core and a valve body, wherein a gas shutoff valve is arranged between each filter chamber and a gas inlet channel, the area between each filter chamber and the gas inlet channel is 20-40 square meters, and the curling gas shutoff valve of the bag type dust collector is used for the working conditions of low pressure, large circulation caliber and large flow; the method is characterized in that:

the valve core comprises a cut-off surface, a supporting surface and a cut-off surface curling device, the size and the shape of the outline of the supporting surface are consistent with the size and the shape of the outline of a box body, a bin body or a pipeline installation position which is also used as the valve body, and the supporting surface is connected with the valve body into a whole; the interception surface and the supporting surface are attached to each other under the action of gas pressure to complete the interception function;

the cut-off surface can be curled; in a working state, the fixed end of the cut-off surface is fixed on a structure which is relatively static with the support surface, and the coiling end of the cut-off surface is directly or indirectly fixed on a reel of the cut-off surface coiling device; the cutoff surface curling device consists of a scroll and a supporting seat or consists of a scroll and a grooved wheel and is used for curling or releasing the cutoff surface; the coiling end of the intercepting surface is fixed on the reel, the reel is dragged to rotate through a power transmission device of the reel, the intercepting surface can be wound on the reel layer by rotating towards a certain direction, and the intercepting surface is released from the reel by rotating towards the other direction.

2. The baghouse crimped gas shut-off valve of claim 1, wherein: the material of the cross-section is various fabrics, fabric coating, metal material, or a combination of fabric coating and supporting rib, and a combination of metal material coating and supporting rib.

3. The baghouse crimped gas shut-off valve of claim 1, wherein: the supporting surface is composed of a supporting surface frame or composed of a supporting surface frame and supporting ribs and/or a supporting rib net fixed on the supporting surface frame.

4. The baghouse crimped gas shut-off valve of claim 3, wherein: the fixed end of the intercepting surface is fixed on the structure and is a suspension structure connected with one end of at least one rope, and the other end of the rope is connected with a suspension structure roller dragged by a suspension structure transmission device.

5. The baghouse crimped gas shut-off valve of claim 4, wherein: the reel is fixed on the upper part of the support surface frame or the valve body or on the suspension structure through a fixing device.

6. The baghouse crimped gas shut-off valve of claim 5, wherein: and a counterweight roller is arranged at the bottom of the inner side of the U-shaped structure formed by the sagging intercepting surface between the edge of the intercepting surface fixed on the frame of the supporting surface and the edge fixed on the scroll.

7. The baghouse crimped gas shut-off valve of claim 4, wherein: two ends of the scroll are respectively provided with a grooved wheel, and the grooved wheels are respectively surrounded by a rope to hang the scroll; one end of each rope is fixed on the upper part of the support surface frame or the valve body or connected to the suspension structure, and the other end of each rope is connected to a reel lifting roller dragged by the power transmission device or connected to the reel lifting roller dragged by the power transmission device through a reel rope fixed pulley fixed on the suspension structure.

8. A bag house comprising a bag house crimped shut-off valve according to any one of claims 1 to 7.