CN210461747U - Automatic control large-diameter quick cut-off bellows gate valve - Google Patents

Abstract

The utility model discloses an automatic control large-caliber quick cut-off bellows gate valve, which relates to a valve, comprising a bellows gate valve body and a control unit thereof, wherein the top end of the bellows gate valve body is provided with a cylinder with a double-piston structure through a bracket, the double-piston structure is connected with a valve rod of the bellows gate valve body through a push rod, the control unit is a driving gas circuit consisting of an external main gas supply source, a two-position five-way gas control valve, a two-position three-way gas control valve, two quick exhaust valves, two-position three-way solenoid valves, a gas storage tank and a plurality of conduits, and the driving gas circuit can realize the function of, by arranging the air storage tank, the corrugated pipe gate valve body can be automatically closed in the air loss state of the equipment, and when the equipment is powered off, the gate valve can be automatically closed, so that the effective control of the pipeline where the corrugated pipe gate valve body is located is realized, and the opening difficulty and the operation difficulty are reduced.

Description

Automatic control large-diameter quick cut-off bellows gate valve

Technical Field

The utility model relates to a valve, concretely relates to pneumatic, but automatic control's bellows gate valve of heavy-calibre.

Background

The gate valve is a shutter plate, the moving direction of which is perpendicular to the fluid direction, and the gate valve can only be fully opened and fully closed, but cannot be adjusted and throttled.

The defects of the prior art are as follows: 1) (ii) a The existing corrugated pipe valve capable of realizing the fault position closing function is mostly realized by adopting a single-acting cylinder with a spring reset function, and the following defects are mainly existed:

a. the valve is normally open, the spring is always in a compressed state, fatigue failure is easy to occur, and the valve cannot be closed when the valve fails;

b. because the valve is closed by the spring reset, the cylinder needs to provide the action of overcoming the spring force and the double force of opening the valve when the valve is opened, and therefore, the required cylinder is large, high in height, heavy in weight and high in cost;

2) most valves only guarantee time requirements when realizing quick closing, and the phenomenon that a large-caliber valve quickly closes a pipeline to generate water hammer is not considered, so that the pipeline is extremely damaged.

3) The large-caliber corrugated pipe valve is mainly used in a main pipeline of a heat medium system, all similar main pipelines in China are manually operated at present, the closing or opening time is dozens of minutes due to large stroke, the temperature of a pipeline medium is high (generally about 300 ℃), the operation of personnel is difficult, and particularly in an emergency state, the requirement of quickly closing the main pipeline and reducing risks is difficult to achieve.

Therefore, how to overcome the defects of the prior art is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a bellows gate valve is cut off fast to automatic control heavy-calibre to solve among the prior art technical problem that the gate valve opened the degree of difficulty big, the operational difficulty.

The utility model discloses a realize through following technical scheme:

the utility model provides an automatic control heavy-calibre cuts off bellows gate valve fast, including bellows gate valve body, be equipped with the cylinder through the support frame directly over the top of bellows gate valve body valve gap, the top of the internal valve rod of bellows gate valve passes its valve gap top and push rod fixed connection, cylinder inner chamber fixed mounting has the fixed partition that can separate its inner chamber into last air cavity and lower air cavity, and the inside space volume of last air cavity is greater than the inside space volume of lower air cavity, be provided with the upper piston in the last air cavity, be provided with the lower piston in the lower air cavity, the top of push rod passes the bottom of cylinder, lower piston, fixed partition and upper piston in proper order and is fixed connection with the upper piston, still the cover is equipped with thick lower thin adapter sleeve on the push rod, the top of the thicker part in adapter sleeve upper portion passes the fixed partition and sets up its bottom in the last air cavity, the bottom end of the thin part of the lower part of the connecting sleeve penetrates through the lower piston to be arranged right below the lower piston, the outer wall of the connecting sleeve is in threaded connection with a locking nut, the top of the locking nut tightly pushes against the bottom of the lower piston, the top of the upper air cavity is provided with a first lower air outlet hole used for communicating the upper air cavity with the external space, the fixed partition plate is provided with a second lower air inlet and outlet hole used for communicating the external space with the lower air cavity, the bottom of the lower air cavity is provided with a first upper air inlet and outlet hole used for communicating the external space with the external space, and the fixed partition plate is provided with a second upper air inlet and outlet hole used for communicating the external space with the;

the device also comprises a two-position five-way air control valve, the input end of the two-position five-way air control valve is connected with an external main air supply source through a first conduit, the first output end of the first quick exhaust valve is connected with the input end of the first quick exhaust valve through a second conduit, the output end of the first quick exhaust valve is connected with the input end of a third conduit, the first ascending air inlet and outlet hole and the second ascending air inlet and outlet hole are respectively connected with the output end of the third catheter through a first air pipe, the second output end of the two-position five-way pneumatic control valve is connected with the first input end of the two-position three-way pneumatic control valve through a fourth conduit, the output end of the two-position three-way pneumatic control valve is connected with the input end of the second quick exhaust valve through a fifth conduit, the output end of the second quick exhaust valve is connected with the input end of a sixth catheter, and the first downward air inlet and outlet hole and the second downward air inlet and outlet hole are respectively connected with the output end of the sixth catheter through a second air pipe;

the first guide pipe is also connected with an input end of a seventh guide pipe, an output end of the seventh guide pipe is connected with a first input end of a gas storage tank through a first one-way valve, and an output end of the gas storage tank is connected with a second input end of the two-position three-way pneumatic control valve through an eighth guide pipe;

the second input end of the gas storage tank is connected with an external standby gas source through a ninth conduit, and the ninth conduit is also provided with a first two-position three-way electromagnetic valve;

the first conduit is also connected with the control end of the two-position three-way pneumatic control valve through a tenth conduit;

the first guide pipe is further connected with the control end of the two-position five-way air control valve through an eleventh guide pipe, and a second two-position three-way electromagnetic valve is further mounted on the eleventh guide pipe.

Furthermore, the output end of the second conduit is directly connected with the two first air pipes, wherein the first air pipe connected with the second ascending air inlet and outlet hole is provided with the first quick exhaust valve, and when the first conduit is communicated with the fourth conduit, the exhaust end of the corresponding two-position five-way air control valve communicated with the second conduit is communicated with a throttle valve.

Further, the input end of the first guide pipe is connected with an external main air supply source through a filtering and reducing valve, and the input end of the seventh guide pipe is directly connected with the output end of the external main air supply source.

Furthermore, a first manual ball valve and a second one-way valve are further installed on the pipe body of the ninth conduit, which is located between the second input end of the gas storage tank and the first two-position three-way electromagnetic valve, and the second one-way valve is located between the first manual ball valve and the first two-position three-way electromagnetic valve.

Furthermore, a second manual ball valve is further installed on a ninth conduit between the first two-position three-way electromagnetic valve and an external standby air source.

Further, a stroke rod is fixedly mounted at the center of the top of the upper piston, the top end of the stroke rod penetrates through the top of the cylinder and is arranged on the outer side of the cylinder, a stroke contact is further mounted at the top of the stroke rod, and a stroke switch corresponding to the stroke contact is fixedly mounted at the top of the cylinder.

Furthermore, a controller is further arranged, and the first two-position three-way electromagnetic valve, the second two-position three-way electromagnetic valve and the travel switch are respectively in signal connection with the controller.

Further, the lower limit of downward movement of the lower piston is set when the bottom end of the connecting sleeve contacts the bottom of the cylinder, and the top of the connecting sleeve is still in the upper air cavity at the time, and the top end of the stroke rod is still outside the cylinder; when the top of the lower piston tightly pushes against the fixed clapboard, the bottom of the thicker part of the upper part of the connecting sleeve tightly pushes against the top of the lower piston.

Further, the corrugated pipe gate valve body comprises a valve body, a medium channel which is used for medium circulation and penetrates through the valve body is arranged in the valve body, a valve plate for cutting off the medium channel is arranged in the medium channel, the top of the valve body is further provided with a stroke space which is communicated with the medium channel and used for allowing the valve plate to move up and down so as to open or cut off the medium channel, the top of the valve plate is fixedly connected with a valve rod, a stuffing box and a corrugated pipe body are sleeved on the valve rod from top to bottom, the bottom end of the stuffing box is hermetically welded with the top end of the corrugated pipe body, the bottom end of the corrugated pipe body is hermetically welded with the outer wall of the valve rod, a valve cover which is not in contact with the corrugated pipe body is sleeved on the outer side of the corrugated pipe body, the bottom end of the valve cover is fixedly and hermetically connected with, the packing box is characterized in that a packing groove which penetrates through the body of the packing box and is thick at the top and thin at the bottom is formed in the center of the top of the packing box, the top end of the valve rod penetrates through the packing groove and then is connected with the bottom end of the push rod, a packing layer is uniformly arranged in a space between the valve rod and the inner wall corresponding to the thick part of the upper part of the packing groove, a packing gland is arranged at the top of the packing layer, the packing gland is sleeved on the valve rod, the bottom end of the packing gland is arranged in the packing groove, the other end of the packing gland is tightly connected with the top.

Further, the cylinder specifically comprises three upper covers, cylindrical coamings and lower covers that are coaxially distributed, lower cover fixed mounting is at the top of support, cylindrical coamings fixed mounting is at the lower cover top, upper cover fixed mounting is at the top of cylindrical coamings.

Compared with the prior art, the utility model has the following advantages: the utility model provides a bellows gate valve is cut off fast to automatic control heavy-calibre, it compares and has following advantage in prior art:

1. in a main pipeline of a high-temperature heat medium system, a pneumatic large-caliber corrugated pipe gate valve is adopted to replace a manual corrugated pipe valve, so that the rapid closing in an emergency state can be realized, the safety function of the system can be ensured, the influence of high temperature on the safety of personnel can be avoided, and remote monitoring control can be realized;

2. by using a double acting cylinder, the overall size, weight, cost and safety of the valve can be reduced. The double-piston structure can provide double thrust when opening, ensure that the flashboard is blocked due to expansion with heat and contraction with cold and is not in open-stop risk at high temperature, realize quick closing of the front 80 percent of strokes and slow closing of the rear 20 percent of strokes, meet the requirement of integral closing time and avoid the generation of water hammer;

3. the standby air source (air storage tank) can be adopted to meet the requirement that the standby air source provides a power source required by the valve when the air supply and power failure happen, so that the failure valve is closed, and the safety requirement of the system is ensured;

4. a safety guarantee air source is designed, when the air pressure of an external main air supply source is lower than a set pressure (the feedback is measured through a voltage meter connected between the main air supply source and an air storage tank), the voltage meter feeds back a signal to a control system, and then a first two-position three-way electromagnetic valve on an air path of an external standby air supply source is controlled through a PLC (programmable logic controller) or DCS (distributed control system) control system, so that the purpose of air supply in the air storage tank is realized, and the air storage tank can provide a sufficient air source under the condition of power failure or air failure of the system.

Drawings

FIG. 1 is a schematic structural view of a bellows gate valve body;

fig. 2 is a schematic structural diagram of a gate valve for automatically controlled large-diameter quick-cutting bellows provided in embodiment 1;

fig. 3 is a schematic structural diagram of a gate valve for automatically controlling a large-diameter quick-cutting bellows provided in embodiment 2.

In the figure: 1. a support; 2. a cylinder; 3. a push rod; 4. fixing the partition board; 5. an upper piston; 6. a lower piston; 7. connecting sleeves; 8. Locking the nut; 9. a first lower travel outlet; 10. a second downlink air inlet and outlet hole; 11. a first uplink air inlet and outlet hole; 12. a second ascending air inlet and outlet hole; 13. a two-position five-way pneumatic control valve; 14. a first conduit; 15. a second conduit; 16. a first quick exhaust valve; 17. a third conduit; 18. a first air pipe; 19. a fourth conduit; 20. a two-position three-way pneumatic control valve; 21. a fifth conduit; 22. A second quick exhaust valve; 23. a sixth conduit; 24. a second air pipe; 25. a seventh conduit; 26. a first check valve; 27. a gas storage tank; 28. an eighth conduit; 29. a ninth conduit; 30. a first two-position three-way solenoid valve; 31. a tenth conduit; 32. an eleventh conduit; 33. a second two-position three-way electromagnetic valve; 34. a filtering pressure reducing valve; 35. a first manual ball valve; 36. a second one-way valve; 37. a second manual ball valve; 38. a trip lever; 39. a travel contact; 40. a travel switch; 41. a valve body; 42. a media channel; 43. a valve plate; 44. a travel space; 45. a valve stem; 46. a stuffing box; 47. a bellows body; 48. a valve cover; 49. a filler layer; 50. a packing gland; 51. an upper cover; 52. a lower cover; 53. a cylindrical coaming; 54. a throttle valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

With reference to fig. 1 and fig. 2, in this embodiment, a pneumatic large-diameter bellows gate valve is provided, which includes a bellows gate valve body, and the overall structure of the bellows gate valve body is as shown in fig. 1, the bellows gate valve body includes a valve body 41, a medium channel 42 penetrating through the bellows gate valve body and used for medium circulation is formed in the valve body 41, a recess facing away from the axis of the medium channel 42 is formed in the middle of the medium channel 42 and provided with a valve plate 43 for blocking the medium channel 42, the valve plate 43 is disposed in the recess, the recess can effectively guide the valve plate 43, and at the same time, a guide rib is disposed on the inner wall of the recess, so as to effectively guide the valve plate 43, so that the valve plate 43 can perform upward and downward movements, and in order to achieve the purpose of upward and downward movement of the valve plate 43, in this embodiment, the top of the valve body 41 is further provided with a stroke space 44 communicated with the medium channel 42 and used for Afterwards, the medium channel 42 can be completely opened, when the medium channel descends to the lower limit, the medium channel 42 can be blocked, in order to effectively drive the valve plate 43 to move up and down, in this embodiment, the top of the valve plate 43 is fixedly connected with a valve rod 45, a packing box 46 and a corrugated pipe body 47 are sleeved on the valve rod 45 from top to bottom, the bottom end of the packing box 46 is hermetically welded with the top end of the corrugated pipe body 47, the bottom end of the corrugated pipe body 47 is hermetically welded with the outer wall of the valve rod 45, a valve cover 48 which is not in contact with the corrugated pipe body 47 is further sleeved on the outer side of the corrugated pipe body 47, and the bottom end of the;

through the arrangement, most of the valve rod 45 is positioned in the corrugated pipe body 47, so that the medium can be effectively prevented from being washed away, and the service life of the corrugated pipe body is greatly prolonged;

in order to effectively fix the stuffing box 46, effectively seal the bellows gate valve body and avoid medium overflow, a groove corresponding to the stuffing box 46 is formed in the center of the top of the valve cover 48, the outer diameter of the stuffing box 46 is equal to the inner diameter of the groove, and the stuffing box 46 is embedded in the groove;

through the arrangement, the groove forms a step-shaped structure, so that the stuffing box 46 can be effectively erected on the groove, the stuffing box 46 can be stably erected, the medium can be prevented from overflowing through a gap between the valve cover 48 and the stuffing box 46, and meanwhile, a sealing ring can be sleeved between the top end of the stuffing box 46 and the bottom of the inner cavity of the groove, so that sealing is further realized;

in order to avoid the overflow of the medium through the gap between the valve rod 45 and the stuffing box 46, in the embodiment, a stuffing groove which penetrates through the body of the stuffing box 46 and is thick at the top and thin at the bottom is formed in the center of the top of the stuffing box 46, the top end of the valve rod 45 penetrates through the stuffing groove and then is connected with the bottom end of the push rod 3, a stuffing layer 49 is uniformly arranged in a space between the valve rod 45 and the inner wall corresponding to the thick part of the upper part of the stuffing groove, a stuffing gland 50 is arranged at the top of the stuffing layer 49, the stuffing gland 50 is sleeved on the valve rod 45, the bottom end of the stuffing gland 50 is arranged in the stuffing groove, the other end of the stuffing;

through the arrangement, the gap between the valve rod 45 and the packing box 46 can be effectively sealed, so that effective sealing is realized, the medium is prevented from overflowing, and the service life of the valve rod 45 is prolonged;

particularly, in the embodiment, the top of the valve cover 48, which is provided with the cylinder 2 through the bracket 1, is directly above the top of the valve cover 48 and is connected with the bracket 1 through a connecting bolt, the cylinder 2 is fixedly installed on the top of the bracket 1, the top end of the valve rod 45 is fixedly connected with the push rod 3 after penetrating the stuffing box 46, in order to facilitate the installation and the disassembly of the equipment, the cylinder 2 and the push rod are connected through the HALF block, the fixed partition plate 4, which can divide the inner cavity of the cylinder 2 into an upper air cavity and a lower air cavity, is fixedly installed in the inner cavity of the cylinder 2, so that the cylinder 2 is divided into an upper part and a lower part, and the upper part and the lower part;

particularly, in this embodiment, in order to effectively control the opening and closing processes, such that the first half is opened quickly and the second half is opened slowly during opening, the first half is closed quickly and the second half is closed slowly during closing, and water hammer and other phenomena are avoided, the volume of the inner space of the upper air cavity is larger than that of the inner space of the lower air cavity, and in this embodiment, the volume of the upper air cavity is about twice as large as that of the lower air cavity;

in particular, in the present embodiment, in order to enable both chambers to operate, in the present embodiment, an upper piston 5 is disposed in the upper chamber, a lower piston 6 is disposed in the lower chamber, the top end of the push rod 3 sequentially passes through the bottom of the cylinder 2, the lower piston 6, the fixed partition plate 4 and the upper piston 5 and is fixedly connected with the upper piston 5, the top end of the push rod 3 is in threaded connection with the upper piston 5, the top end of the push rod is disposed above the upper piston 5 and is in threaded connection with a fastening nut, the bottom of the fastening nut tightly pushes the top of the upper piston 5, so as to effectively and fixedly connect the upper piston 5 and the push rod 3, the push rod 3 is further sleeved with a connecting sleeve 7 which is thick at the top and thin at the bottom, the top of the thicker part of the connecting sleeve 7 is disposed in the upper chamber through the fixed partition plate 4, the bottom end of the connecting sleeve is disposed in the lower chamber and is sealed with the contact part between the, the outer wall of the piston is in threaded connection with a locking nut 8, and the top of the locking nut 8 tightly pushes against the bottom of the lower piston 6;

particularly, when the bottom end of the connecting sleeve 7 contacts the bottom of the cylinder 2, the lower limit of the lower piston 6 is lower, and at the moment, the top of the connecting sleeve 7 is still positioned in the upper air cavity, and meanwhile, the top end of the stroke rod 38 is still positioned at the outer side of the cylinder 2; when the top of the lower piston 6 tightly pushes against the fixed clapboard 4, the bottom of the thicker part of the upper part of the connecting sleeve 7 tightly pushes against the top of the lower piston 6.

Particularly, the top of the upper air cavity is provided with a first downward air outlet 9 for communicating with the external space, the fixed partition plate 4 is provided with a second downward air inlet and outlet 10 for communicating the external space with the lower air cavity, the bottom of the lower air cavity is provided with a first upward air inlet and outlet 11 for communicating with the external space, and the fixed partition plate 4 is provided with a second upward air inlet and outlet 12 for communicating the external space with the upper air cylinder 2.

Specifically, in the present embodiment, the cylinder 2 is specifically composed of three coaxially distributed upper covers 51, cylindrical enclosures 53 and lower covers 52, the lower covers 52 are fixedly installed on the top of the bracket 1, the cylindrical enclosures 53 are fixedly installed on the top of the lower covers 52, and the upper covers 51 are fixedly installed on the top of the cylindrical enclosures 53.

Through the arrangement, when the valve plate 43 closes the medium channel 42, the bottom of the upper piston 5 tightly pushes the top of the connecting sleeve 7, and the bottom end of the thick part of the upper part of the connecting sleeve 7 tightly pushes the top of the lower piston 6 and the top of the locking nut 8 tightly pushes the top of the lower piston 6, so that the lower piston 6 can drive the connecting sleeve 7 to move synchronously when moving upwards;

when the valve plate 43 needs to be opened, the first upward air inlet and outlet hole 11 and the second upward air inlet and outlet hole 12 are used for respectively supplying air to the space at the lower part of the lower piston 6 in the lower air cavity and the space at the lower part of the upper piston 5 in the upper air cavity, so as to synchronously push the lower piston 6 and the upper piston 5 to move upwards, when the lower piston 6 moves upwards, firstly, because the air inlet pressures of the first upward air inlet and outlet hole 11 and the second upward air inlet and outlet hole 12 are the same, the thrust generated by the two pistons are the same, and in combination with the relationship of the connecting sleeve 7, when the valve plate 43 is normal, the two pistons move upwards synchronously when the valve plate 43 is opened, so that the push rod 3 can only receive the upward thrust of the upper piston 5 (namely, when the upper piston 5 can push the push rod 3 by itself when the valve plate 43 is started normally (because the valve plate 43 receives high medium pressure and the like), because, the valve rod 45 is not directly pushed to move upwards, direct thrust is not provided for the valve rod, but the connecting sleeve 7 is pushed to move upwards when the lower piston 6 moves upwards, the top end of the connecting sleeve 7 tightly pushes the upper piston 5 at the moment, and the push rod 3 cannot be pushed when the upper piston 5 receives the upward thrust of the upper air cavity at the moment, so that the upper piston 5 is provided with the upward thrust through the connecting sleeve 7 when the lower piston 6 moves upwards, and the push rod 3 receives twice of the upward thrust by combining the upward force provided for the upper piston 5 after the upper air cavity is inflated, so that the purpose of opening the valve plate 43 by double thrust is achieved; after the lower piston 6 moves upwards to the tightly-jacked fixed partition plate 4, the connecting sleeve 7 is not pushed, the upper piston 5 continues to move upwards to drive the push rod 3 to move upwards until the lower piston is completely opened, and at the moment, the upward force is doubled; in the process, the first downward air inlet and outlet hole 9 and the second downward air inlet and outlet hole 10 are respectively used for discharging the air in the upper space of the lower piston 6 in the lower air cavity and the air in the upper space of the upper piston 5 in the upper air cavity (discharging air through the second quick exhaust valve 22), so that pressure balance is realized, and the phenomenon that the compressed air blocks the air is avoided.

When the medium channel 42 is switched to be closed by the valve plate 43 from a completely opened state, firstly, the space of the upper air cavity on the upper part of the upper piston 5 and the space of the lower air cavity on the upper part of the lower piston 6 are respectively inflated by the first downward air inlet and outlet hole 9 and the second downward air inlet and outlet hole 10, the push rod 3 is pushed by the downward movement of the upper piston 5, the connecting sleeve 7 is pushed by the downward movement of the lower piston 6, the air is exhausted by the first rapid exhaust valve 16 through the first upward air inlet and outlet hole 11 and the second upward air inlet and outlet hole 12, and finally the valve plate 43 is closed.

In order to realize the purpose of starting and automatically controlling the opening or closing of the valve plate 43, in the embodiment, with reference to fig. 3, the valve further comprises a two-position five-way air control valve 13, an input end of the two-position five-way air control valve 13 is connected with an external main air supply source through a first conduit 14, a first output end of the two-position five-way air control valve is connected with an input end of a first quick exhaust valve 16 through a second conduit 15, an output end of the first quick exhaust valve 16 is connected with an input end of a third conduit 17, a first ascending air inlet/outlet hole 11 and a second ascending air inlet/outlet hole 12 are respectively connected with an output end of the third conduit 17 through a first air pipe 18, a second output end of the two-position five-way air control valve 13 is connected with a first input end of a two-position three-way air control valve 20 through a fourth conduit 19, an output end of the two-position three-way air, the first lower air inlet and outlet hole 9 and the second lower air inlet and outlet hole 10 are respectively connected with the output end of the sixth guide pipe 23 through a second air pipe 24;

the first conduit 14 is further connected with an input end of a seventh conduit 25, an output end of the seventh conduit 25 is connected with a first input end of an air storage tank 27 through a first one-way valve 26, in order to realize air pressure detection of the external main air supply source, an electric contact pressure gauge is further installed on a pipe body, positioned between the external main air supply source and the first one-way valve 26, of the seventh conduit 25, and an output end of the air storage tank 27 is connected with a second input end of the two-position three-way air control valve 20 through an eighth conduit 28;

a second input end of the gas storage tank 27 is connected with an external standby gas source through a ninth conduit 29, and the ninth conduit 29 is further provided with a first two-position three-way electromagnetic valve 30;

the first conduit 14 is also connected with the control end of the two-position three-way pneumatic control valve 20 through a tenth conduit 31;

the first conduit 14 is further connected with a control end of the two-position five-way pneumatic control valve 13 through an eleventh conduit 32, and a second two-position three-way electromagnetic valve 33 is further mounted on the eleventh conduit 32.

In particular, in order to avoid excessive pressure of the gas supplied from the external main gas supply source and unclean gas supply in this embodiment, the input end of the first conduit 14 is connected to the external main gas supply source through the filtering and pressure reducing valve 34 in this embodiment.

In particular, in order to enable efficient inflation of the air reservoir 27 and avoid under-pressure, in this embodiment the input of the seventh conduit 25 is connected directly to the output of the external main air supply.

In particular, in this embodiment, in order to effectively control the supply of the standby external standby air, a first manual ball valve 35 and a second one-way valve 36 are further installed on the pipe body of the ninth conduit 29 between the second input end of the air storage tank 27 and the first two-position three-way solenoid valve 30, and the second one-way valve 36 is located between the first manual ball valve 35 and the first two-position three-way solenoid valve 30.

A second manual ball valve 37 is also mounted on the ninth conduit 29 between the first two-position three-way solenoid valve 30 and the external backup air source, and the two manual ball valves are in a normally open state.

In particular, in order to facilitate the control and feedback of the opening stroke of the valve plate 43 and achieve precise control of the opening stroke, in the present embodiment, a stroke rod 38 is fixedly installed at the center of the top of the upper piston 5, the top end of the stroke rod 38 penetrates through the top of the cylinder 2 to be arranged at the outer side of the cylinder, a stroke contact 39 is further installed at the top of the stroke rod, and a stroke switch 40 corresponding to the stroke contact is fixedly installed at the top of the cylinder 2.

Particularly, in this embodiment, in order to realize the automatic control of the device, an editable single chip microcomputer commonly used in the controller is further provided, and the first two-position three-way electromagnetic valve 30, the second two-position three-way electromagnetic valve 33 and the travel switch are respectively in signal connection with the controller.

The working principle is as follows:

the control strategy of the device provided by the embodiment is as follows:

when the equipment is kept normally open, and the external main air supply source, the external standby air supply source and the power supply system of the equipment are stable, the equipment has the following states:

1) the air pressure in the air storage tank 27 is in a set range, the first two-position three-way electromagnetic valve 30 is in a normally closed state, the second two-position three-way electromagnetic valve 33 is in a normally open state, the air flow of the external main air supply source is decompressed by the filtering and reducing valve 34 and then enters the control end of the two-position five-way air control valve 13 through the eleventh guide pipe 32 and the second two-position three-way electromagnetic valve 33 to obtain an air signal, the two-position five-way air control valve 13 obtains the air signal, the two-position five-way air control valve controls the first guide pipe 14 to be communicated with the second guide pipe 15, when the two-position five-way air control valve 13 does not have the air signal, the two-position five-way air control valve controls the first guide pipe 14 to be communicated with the fourth guide pipe 19, the air flow of the external main air supply source enters the two first air pipes 18 through the first guide pipe 14, the two-position five-way air control valve 13, the second guide pipe 15 and the first quick exhaust valve 16 and then enters Therefore, the lower piston 6 and the upper piston 5 are pushed to respectively move upwards, and meanwhile, the gas at the upper part of the upper piston 5 in the first upper air cavity and the gas at the upper part of the lower piston 6 in the lower air cavity are respectively discharged through a second gas pipe 24 and a sixth gas pipe 23 after passing through a first lower air inlet and outlet hole 9 and a second lower air inlet and outlet hole 10, so that the pressure balance in the cylinder body is realized, and the resistance generated by compressed gas is avoided; in combination with the above, the push rod 3 is pushed to move upwards to drive the valve plate 43 to move upwards through the valve rod 45, the medium channel 42 is opened until the upper piston 5 moves to the upper limit, the stroke rod 38 drives the stroke contact 39 to move upwards to be in contact with the stroke switch, the controller obtains an opening signal of the valve plate 43, and after the upper piston 5 reaches the upper limit, the air pressure in the upper air cavity and the air pressure in the lower air cavity reach stability, and the opening state is maintained;

2) the air pressure of the external main air supply source is transmitted to the control end of the two-position three-way pneumatic control valve 20 through the tenth conduit 31 to obtain an air signal, when the two-position three-way pneumatic control valve 20 has the air signal, the fourth conduit 19 is communicated with the fifth conduit 21, and when the two-position three-way pneumatic control valve 20 has no air signal, the eighth conduit 28 is controlled to be communicated with the fifth conduit 21;

3) the air flow of the external main air supply source supplies air to the air storage tank 27 through the seventh conduit 25 and the first one-way valve 26, the first one-way valve 26 can prevent the air flow from flowing backwards after the air pressure of the external main air supply source is reduced, the air storage tank 27 is inflated until the air pressure reaches a set value, the electric contact pressure gauge can monitor and feed back the air pressure of the external main air supply source, the air flow of the air storage tank 27 flows to the eighth conduit 28, therefore, the two-position three-way air control valve 20 has an air signal when the air flow of the air storage tank 27 flows to the eighth conduit 28, the control strategy is that the fourth conduit 19 is communicated with the fifth conduit 21, and the air; the air in the air storage tank 27 flows to the second check valve 36 through the ninth conduit 29, the first manual ball valve 35 and the second manual ball valve 37 are throttled in a normally open state, and the air pressure is kept balanced after flowing to the first manual ball valve and the second manual ball valve; when the electric contact pressure gauge detects that the air pressure of the external main air supply source is insufficient, the controller controls the first two-position three-way electromagnetic valve 30 to be opened, and the external standby air supply source provides an air source for the air storage tank 27 to inflate the air storage tank.

The states 1 to 3 are states when the device is normally kept normally open.

4) When the equipment is in a normal state and needs to be closed, the controller controls the second two-position three-way electromagnetic valve 33 to be closed, the two-position five-way air control valve 13 loses an air signal at the moment, the first conduit 14 is communicated with the fourth conduit 19, and the air signal of the two-position three-way air control valve 20 still exists at the moment, so that the airflow of an external main air supply source enters the sixth conduit 23 after passing through the first conduit 14, the fourth conduit 19, the fifth conduit 21 and the second quick exhaust valve 22, and enters the space above the upper piston 5 of the upper air cavity and the space above the lower piston 6 of the lower air cavity through the first lower air inlet and outlet hole 9 and the second lower air inlet and outlet hole 10 after passing through the first air pipe 18 respectively, so as to push the upper piston 5 and the lower piston 6 to descend until the flashboard 5 moves to the lower limit, the purpose that the push rod 3 pushes the descending medium channel 42 to be closed through the valve rod 45 is realized, and in the, feeding back to the controller to obtain a closing signal of the valve plate 43; meanwhile, the gas in the lower space of the upper piston 5 in the upper gas cavity and the gas below the lower piston 6 in the lower gas cavity pass through the second ascending gas inlet/outlet hole 12 and the first ascending gas inlet/outlet hole 11, then pass through the two first gas pipes 18, and then are discharged through the first quick exhaust valve 16, so that the pressure balance is realized, and the generation of compressed gas is avoided.

When the power supply system of the equipment is lost, the equipment has the following states:

1) the second two-position three-way solenoid valve 33 is closed, the two-position five-way pneumatic control valve 13 loses the pneumatic signal, the first conduit 14 is communicated with the fourth conduit 19, the two-position three-way pneumatic control valve 20 still has the pneumatic signal, the fourth conduit 19 is communicated with the fifth conduit 21, and the valve plate 43 is closed after the first conduit 14, the fourth conduit 19 and the fifth conduit 21 are subjected to air flow of the external main air supply source.

When the main air supply source outside the equipment is not used for supplying air any more and is in an air loss state, the equipment has the following states:

1) the two-position five-way pneumatic control valve 13 and the two-position three-way pneumatic control valve 20 lose the air removal signals respectively, no air flow is generated in the second guide pipe 15 and the fourth guide pipe 19 because no air flow exists in the external main air supply source, the eighth guide pipe 28 is communicated with the fifth guide pipe 21, and the valve plate 43 is closed after the air flow of the air storage tank 27 enters the fifth guide pipe 21 through the eighth guide pipe 28.

And fourthly, when the main air supply source outside the equipment and the power supply system are both lost, the equipment has the same state as the third state.

And fifthly, the external spare air supply source only serves as an air supply for the air storage tank 27, does not serve as a part of the control strategy of the valve plate 43, and only serves as a spare air supply for supplying air for the air storage tank 27.

Example 2

Referring to fig. 3, in this embodiment, a pneumatic large-diameter bellows gate valve is provided, which has the same main structure as embodiment 1, except that:

the output end of the second conduit 15 is directly connected with the two first air pipes 18 (i.e. the third conduit 17 is omitted), wherein the first air pipe 18 connected with the second ascending air inlet/outlet hole 12 is provided with the first quick exhaust valve 16, and when the first conduit 14 is communicated with the fourth conduit 19, the exhaust end of the two-position five-way air control valve 13 communicated with the second conduit 15 is communicated with a throttle valve 54.

With the above arrangement, the operating principle differs from that of embodiment 1 in that:

particularly, in the embodiment, in order to effectively control the closing process, so that the first half of the closing process is closed quickly, the second half of the closing process is closed slowly, and the water hammer phenomenon is avoided, a throttling device is arranged at the lower air inlet and outlet in the lower air cavity, and the exhaust speed of the lower air cavity is controlled to control the closing time of the last 20% of the stroke;

when the medium channel 42 is switched from a completely opened state to a closed medium channel 42 of a valve plate 43, firstly, a space with an upper air cavity positioned at the upper part of an upper piston 5 and a space with a lower air cavity positioned at the upper part of a lower piston 6 are respectively inflated by a first downward air inlet and outlet hole 9 and a second downward air inlet and outlet hole 10, the upper piston 5 pushes a push rod 3 to move downward, the lower piston 6 pushes a connecting sleeve 7 to move downward, and because a first air pipe 18 connected with a second upward air inlet and outlet hole 12 is provided with a first quick exhaust valve 16, the space air with the upper air cavity positioned at the lower part of the upper piston 5 is quickly exhausted through the first quick exhaust valve 16, and the push rod 3 is pushed downward by the; the first upward air inlet and outlet hole 11 passes through the first air pipe 18 connected with the first upward air inlet and outlet hole and then passes through the second conduit 15 to be connected with the exhaust end communicated with the two-position five-way air control valve 13, and a throttle valve 54 is further installed at the exhaust end, so that the exhaust speed of the first upward air inlet and outlet hole 11 can be reduced, the lower piston 6 pushes the connecting sleeve 7 to descend at a lower speed, when the upper piston 5 descends to push the push rod 3 to descend to 80% of the total stroke quickly, the lower part of the upper piston 5 is in contact with the upper part of the connecting sleeve 7, at the moment, the speed of the upper piston 5 descending to push the push rod 3 is reduced, and is equivalent to the speed of the lower piston 6 pushing the connecting sleeve 7 to descend, and therefore the effects of 80% quick closing of the front.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A self-control large-caliber quick-cut bellows gate valve comprises a bellows gate valve body and is characterized in that a cylinder (2) is erected right above the top of a valve cover (48) of the bellows gate valve body through a support (1), the top end of a valve rod (45) in the bellows gate valve body penetrates through the top of the valve cover (48) and is fixedly connected with a push rod (3), a fixed partition plate (4) capable of dividing an inner cavity of the cylinder (2) into an upper air cavity and a lower air cavity is fixedly installed in the inner cavity of the cylinder, the volume of the inner space of the upper air cavity is larger than that of the inner space of the lower air cavity, an upper piston (5) is arranged in the upper air cavity, a lower piston (6) is arranged in the lower air cavity, the top end of the push rod (3) sequentially penetrates through the bottom of the cylinder (2), the lower piston (6), the fixed partition plate (4) and, the push rod (3) is further sleeved with a connecting sleeve (7) which is thick at the upper part and thin at the lower part, the top of the thick part at the upper part of the connecting sleeve (7) penetrates through a fixed partition plate (4) to be arranged in an upper air cavity, the bottom of the thick part at the lower part of the connecting sleeve (7) penetrates through a lower piston (6) to be arranged under the connecting sleeve, the outer wall of the connecting sleeve is in threaded connection with a locking nut (8), the top of the locking nut (8) tightly pushes against the bottom of the lower piston (6), the top of the upper air cavity is provided with a first lower air outlet (9) for communicating the upper air cavity with the external space, the fixed partition plate (4) is provided with a second lower air inlet and outlet (10) for communicating the external space with the lower air cavity, the bottom of the lower air cavity is provided with a first upper air inlet and outlet (11) for communicating the external space with the external space, and the fixed partition plate (4) is provided with a second upper air inlet and outlet;

the air supply system further comprises a two-position five-way air control valve (13), the input end of the two-position five-way air control valve (13) is connected with an external main air supply source through a first guide pipe (14), the first output end of the two-position five-way air control valve (13) is connected with the input end of a first quick exhaust valve (16) through a second guide pipe (15), the output end of the first quick exhaust valve (16) is connected with the input end of a third guide pipe (17), a first ascending air inlet/outlet hole (11) and a second ascending air inlet/outlet hole (12) are respectively connected with the output end of the third guide pipe (17) through a first air pipe (18), the second output end of the five-way air control valve (13) is connected with the first input end of a two-position three-way air control valve (20) through a fourth guide pipe (19), the output end of the two-position three-way air control valve (20) is connected with the input end of a second quick exhaust valve (22) through a fifth guide pipe (, the first downward air inlet and outlet hole (9) and the second downward air inlet and outlet hole (10) are respectively connected with the output end of the sixth guide pipe (23) through a second air pipe (24);

the first guide pipe (14) is also connected with an input end of a seventh guide pipe (25), an output end of the seventh guide pipe (25) is connected with a first input end of an air storage tank (27) through a first one-way valve (26), and an output end of the air storage tank (27) is connected with a second input end of the two-position three-way air control valve (20) through an eighth guide pipe (28);

a second input end of the air storage tank (27) is connected with an external standby air source through a ninth conduit (29), and the ninth conduit (29) is also provided with a first two-position three-way electromagnetic valve (30);

the first conduit (14) is also connected with the control end of the two-position three-way pneumatic control valve (20) through a tenth conduit (31);

the first guide pipe (14) is further connected with the control end of the two-position five-way pneumatic control valve (13) through an eleventh guide pipe (32), and the eleventh guide pipe (32) is further provided with a second two-position three-way electromagnetic valve (33).

2. The automatic control large-caliber quick cut-off bellows gate valve according to claim 1, wherein the output end of the second conduit (15) is directly connected with two first air pipes (18), wherein the first air pipe (18) connected with the second ascending air inlet and outlet hole (12) is provided with the first quick exhaust valve (16), and when the first conduit (14) is communicated with the fourth conduit (19), the exhaust end of the corresponding two-position five-way air control valve (13) communicated with the second conduit (15) is communicated with a throttle valve (54).

3. An automatically controlled large caliber quick disconnect bellows gate valve as claimed in claim 1 or 2 wherein the input end of the first conduit (14) is connected to the external main air supply through a filter and relief valve (34) and the input end of the seventh conduit (25) is directly connected to the output end of the external main air supply.

4. A self-controlled large-caliber quick-cut bellows gate valve according to claim 3, wherein the ninth conduit (29) is further provided with a first manual ball valve (35) and a second check valve (36) on the pipe body between the second input end of the gas storage tank (27) and the first two-position three-way solenoid valve (30), and the second check valve (36) is located between the first manual ball valve (35) and the first two-position three-way solenoid valve (30).

5. An automatic control large-caliber quick cut-off bellows gate valve according to claim 4, characterized in that a second manual ball valve (37) is further installed on a ninth conduit (29) between the first two-position three-way solenoid valve (30) and an external backup air source.

6. An automatic control large-caliber quick cut-off bellows gate valve according to claim 5, characterized in that a stroke rod (38) is fixedly installed at the center of the top of the upper piston (5), the top end of the stroke rod (38) passes through the top of the cylinder (2) to be arranged at the outer side of the cylinder, a stroke contact (39) is further installed at the top of the stroke rod, and a stroke switch (40) corresponding to the stroke contact is fixedly installed at the top of the cylinder (2).

7. The automatic control large-caliber quick cut-off bellows gate valve according to claim 6, characterized in that a controller is further provided, and the first two-position three-way solenoid valve (30), the second two-position three-way solenoid valve (33) and the travel switch are respectively in signal connection with the controller.

8. The automatic control large-caliber quick cut-off bellows gate valve according to claim 7, characterized in that the lower limit of the downward movement of the lower piston (6) is set when the bottom end of the connecting sleeve (7) contacts the bottom of the cylinder (2), and the top of the connecting sleeve (7) is still in the upper air cavity and the top of the stroke rod (38) is still outside the cylinder (2); when the top of the lower piston (6) tightly pushes against the fixed clapboard (4), the bottom of the thicker part of the upper part of the connecting sleeve (7) tightly pushes against the top of the lower piston (6).

9. The automatic control large-caliber quick-cutting bellows gate valve according to claim 8, wherein the bellows gate valve body comprises a valve body (41), a medium passage (42) penetrating through the valve body and used for medium circulation is formed in the valve body (41), a valve plate (43) for separating the medium passage is arranged in the medium passage (42), a stroke space (44) communicated with the medium passage (42) and used for enabling the valve plate (43) to move up and down to open or separate the medium passage (42) is further formed in the top of the valve body (41), a valve rod (45) is fixedly connected to the top of the valve plate (43), a stuffing box (46) and a bellows body (47) are sleeved on the valve rod (45) from top to bottom, the bottom end of the stuffing box (46) is hermetically welded with the top end of the bellows body (47), and the bottom end of the bellows body (47) is hermetically welded with the outer wall of the valve rod (45), the corrugated pipe is characterized in that a valve cover (48) which is not in contact with the corrugated pipe body is further sleeved on the outer side of the corrugated pipe body (47), the bottom end of the valve cover (48) is fixedly and hermetically connected with the top end of the valve body (41), a groove corresponding to the stuffing box (46) is formed in the center of the top of the valve cover (48), the stuffing box (46) is embedded in the groove, a stuffing groove which penetrates through the body of the stuffing box (46) and is thick at the top and thin at the bottom is formed in the center of the top of the stuffing box (46), the top end of the valve rod (45) penetrates through the stuffing groove and then is connected with the bottom end of the push rod (3), a stuffing layer (49) is uniformly arranged in a space between the valve rod (45) and the inner wall corresponding to the thick upper part of the stuffing groove, a stuffing gland (50) is arranged at the top of the stuffing layer (49), the stuffing gland (50) is sleeved on the valve rod (45) and the, the top of the valve cover (48) is fixedly provided with the bracket (1).

10. The automatic control large-caliber quick-cutting bellows gate valve according to claim 9, wherein the cylinder (2) is composed of three coaxially distributed upper covers (51), cylindrical enclosing plates (53) and lower covers (52), the lower covers (52) are fixedly arranged at the top of the support (1), the cylindrical enclosing plates (53) are fixedly arranged at the top of the lower covers (52), and the upper covers (51) are fixedly arranged at the top of the cylindrical enclosing plates (53).

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