CN202280886U - Check valve used for smoke wind system - Google Patents
Check valve used for smoke wind system Download PDFInfo
- Publication number
- CN202280886U CN202280886U CN2011203665085U CN201120366508U CN202280886U CN 202280886 U CN202280886 U CN 202280886U CN 2011203665085 U CN2011203665085 U CN 2011203665085U CN 201120366508 U CN201120366508 U CN 201120366508U CN 202280886 U CN202280886 U CN 202280886U
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- baffle plate
- baffle
- check valve
- valve
- cam
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Abstract
The utility model relates to a check valve used for a smoke wind system. The check valve is provided with a valve shell, a baffle and a baffle spindle, wherein the baffle spindle is arranged in the valve shell and is vertical to the airflow direction; two ends of the baffle spindle are arranged in a bearing pedestal arranged on the valve shell; the baffle is installed on the baffle spindle; spacing blocks are respectively arranged on the horizontal position and the vertical position of the baffle; the baffle spindle is eccentrically arranged and an eccentric point is arranged at the position 1/4-5/8 of width of the baffle; at least one end of the baffle spindle is connected with a cam; the outer edge side of the cam is provided with an elastic damping device; and the elastic damping device contacts the outer edge of the cam by a mandril. The valve provided by the utility model is flexible to open and close. The valve can be automatically opened at an exact time point by force balance when a fan is started; in the fan starting process, a fan volute is normal and stable and is free from the problems of sucking and vibrating; the problem that the smoke wind flows back when multiple groups of fans operate can be solved; the problem that rotating parts are damaged because the fan is inversely started for a long time can be avoided; and the check valve has the advantages that the implementation manner is simple, the manufacturing cost is low and no additional operation step is adopted.
Description
Technical field
The utility model relates to a kind of reverse stop valve device, particularly a kind of check valve that is used for air and gas system.
Background technique
In the station service in thermal power plant, the power consumption of eight big blower fans such as the primary air fan of air and gas system, gas fan, induced draught fan and desulfurization booster fan accounts for 30% of total power consumption.Because the variation of fuel variations and generation load, can there be low load condition in boiler, and blower fan is in the fallback state of self like this, the waste electric energy.In order to reduce the electricity consumption of equipment amount, present way is to improve air and gas system, if keep under the existing equipment system status; The cover of will stopping transport during boiler at low load send induced draught fan, and so, the branch wind pipe road must completely cut off with main air-duct; Branch flue must completely cut off with main chimney flue, but conventional centrifugal blower need be opened the isolated door on outlet cigarette, the air channel when starting, otherwise can occur the surge of spiral case during fan starting; According to the result of such operation, after the isolated door of outlet is opened, will promote draught fan impeller from the cigarette wind of system; Reversing can appear in blower fan, and rotating speed can be because of the air quantity size variation that flows backwards.Contrast does not have the reversing blower fan, and motor will overcome reversing torsion during fan starting, just can make fan starting, like this starting time moment long, electric current greatly, the impeller of blower fan and the diameter of axle receive shearing force and rise significantly.So, long-term exertin, metal generation fatigue damage it is reported, since power-saving measures was implemented, blower fan generation blade fail in shear, axle fail in shear problem were a lot of.
The model utility content
The purpose of the utility model is: to the problem of above-mentioned existing technology existence; A kind of check valve that is used for air and gas system is proposed; Volute of blower surge in the time of can not only preventing to start; Can also intercept simultaneously reverse and next flue gas or wind effectively, prevent the reversing of gas fan or induced draught fan, send draught fan impeller, diameter of axle reversing to start exertin, fail in shear problem thereby solve.
In order to reach above purpose; A kind of check valve that is used for air and gas system of the utility model; Mainly contain valve housing, baffle plate and be located in the said valve housing and the baffle plate rotating shaft vertical with airflow direction; Said baffle plate rotating shaft two ends are arranged in the bearing support on the said valve housing, and said baffle plate is installed in the said baffle plate rotating shaft, is respectively equipped with limiting stopper at said baffle plate horizontal position and vertical position; Said baffle plate rotating shaft is set for the eccentric, eccentric point be arranged at said barrier width 1/4～5/8 between; At least one end of said baffle plate rotating shaft is connected with cam, and said cam outer edge side is provided with elastic damping device, and said elastic damping device contacts with said cam outer rim through push rod.
The further qualification technological scheme of the utility model is: the aforesaid check valve that is used for air and gas system, the other end of said baffle plate rotating shaft also is equipped with handle, can be when valve is unusual, through spanner or bat-handle switch valve.
The aforesaid check valve that is used for air and gas system; Said elastic damping device comprises push rod, spring, spring shield, spring fixator; Said spring fixator is installed in the outside of said valve housing; Said spring shield is installed in the below, in said spring shield, is provided with said spring and said push rod successively; In baffle plate is opened, can play damping function, simultaneously with the baffle plate switch be converted into move up and down to the spring lifting force, accept the thrust of cam, thrust is converted into the elastic force of spring.
The aforesaid check valve that is used for air and gas system, said cam thickness are 1～2 times of said push rod diameter, and said cam outer rim is provided with the curved surface groove, and curved surface groove and said push rod termination surface of contact are greater than 45 °
The aforesaid check valve that is used for air and gas system, said baffle plate both sides are provided with the baffle plate stiffening rib, reduce baffle plate weight to improve the baffle plate rigidity.
Further, the aforesaid check valve that is used for air and gas system, said baffle plate coupling shaft is round steel or hollow tubular, external diameter is 20～50mm.
The beneficial effect of the utility model is: the valve switch of the utility model is flexible, can open automatically by valve during fan starting, and through equilibrium of forces, the not late late valve of opening, in the blower fan opening process, volute of blower is stable normal, the problem of not aspirating chatter; Solve when organizing fan operation, cigarette wind-fall flow problem has prevented that blower fan from reversing the problem that starts the rotatable parts damage for a long time more; Implementation is easy, and manufacturing cost is low, does not increase operation.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is the utility model structural representation.
Fig. 2 is the lateral plan of Fig. 1.
Among the figure: 1. outlet(discharge) flange; 2. suction flange; 3. it is spacing that baffle plate is opened foot; 4. limiting board; 5. baffle plate; 6. baffle plate stiffening rib; 7. baffle plate coupling shaft; 8. valve housing; 9. bearing letter; 10. bearing gland; 11. bearing; 12. bearing letter; 13. bearing; 14. bearing adjustment gland; 15. cam; 16. the connecting key of cam and axle; 17. locking nut; 18. push rod; 19. spring; 20. spring shield; 21. spring fixator; 22. handle; 23. locking nut.
Embodiment
Embodiment one
Present embodiment provides a kind of check valve that is used for air and gas system, and basic structure is as depicted in figs. 1 and 2, and outlet(discharge) flange 1, suction flange 2 are selected according to valve size, and is welded with angle steel or band steel punching, is welded on the import and export of valve housing 8; Baffle plate is opened foot spacing 3 and all is welded on valve housing 8 counterclockwise 85 ° and horizontal positions with band steel or angle steel with limiting board 4; Baffle plate 5 is 2～3 millimeters steel plate with baffle plate stiffening rib 6, is connected with baffle plate coupling shaft 7 through welding manner, in order to prevent welding deformation; Require the symmetry welding; Baffle plate coupling shaft 7 is round steel or hollow tubular, and external diameter is formed by machined into for 20～50 millimeters, and its perpendicularity, ovality and degree of finish meet conventional axle processing request; Diameter is selected the weight with ability supporting baffle assemblying body, indeformable bending, easy to use being as the criterion; Bearing letter 9 is welded on the valve housing 8 after good with 12 Vehicle Processings of bearing letter, which is provided with tank filler sleeve, and it is lubricated when the through-flow medium of valve is hot flue gas, can to add molybdenum disulfide, and through-flow medium can add butter during for cold wind and lubricate; Bearing gland 10 and bearing adjustment gland 14 is connected with stuffing box through bolt, and with the different positions that limit bearing of the thickness of pad, thereby the position of baffle plate 5 in valve housing 8 adjusted in assurance, guarantees that promptly baffle plate 5 and housing 8 do not collide, and switch is flexible; The Base radius of cam 15 and maximum radius design; Meet the cam design requirement, cam 15 thickness are 1～2 times of push rod 18 diameters, and the diameter of cam 15 and push rod 18 contact surface grooves is greater than push rod 18 diameters; Keep cam 15 curved surface grooves and push rod 18 termination surface of contact greater than 45 °; Cam 15 is formed by machining, and its processing request meets the requirement of conventional cam processing criterion, cam 15, is fixed on baffle plate coupling shaft 7 through connecting key 16 and locking nut 17; Spring 19 is cylindrical spiral pressing spring; Its pressure maximum that bears is 0.15～0.25 times of power that blower fan normally starts blast; The maximum deformation quantity of spring is looked the height and the decision of air channel height of actual valve; The spring material diameter is advisable less than 20 millimeters, according to above-mentioned condition design spring 19 height, diameter, notices that appropriateness alleviates the deadweight problem of spring; Open counterclockwise to 85 ° when valve and to open the thrust that foot spacing 3 is accepted blast by baffle plate, spring is in maximum artesian condition.Spring fixator 21 is welded on the valve housing, and spring shield 20 welding or bolton are on spring fixator 21, and the spring top closely contacts with spring shield 20, is the stationary plane of spring, and the spring bottom contacts with latch bracket 18 in push rod.When valve during in closed position, spring 19 does not stress, and along with baffle plate 5 is opened (being rotated counterclockwise), cam 15 rotation jack-up push rods 18 increase spring 19 pressure gradually, bear pressure maximum up to opening foot.
The working principle of present embodiment: 1. valve is opened the eccentric leverage power of automatic unlatching effect plate washer with blower fan and is opened spigot baffle.
When 1) there was not other fan operation in air and gas system: establishing spigot baffle 5 width was L, and baffle plate coupling shaft 7 is arranged between the eccentric 1/8L in baffle plate 5 centers～1/4L zone; Behind fan starting, under the effect of cigarette wind-force, because the existence of limiting board 4 direction constrain effects and eccentric arm of force, baffle plate 5 is rotated counterclockwise unlatching; In order to reduce because of the problem that baffle plate is big, the Heavy Weight resistance is big, baffle plate coupling shaft 7 both sides are provided with the rolling bearing group; In order to limit maximum opening, be provided with baffle plate at valve housing 8 and open foot spacing 3 and open sufficient position and be located at 85 °; In order to guarantee that spigot baffle 5 slowly opens with opening process stablely, in a side of spigot baffle coupling shaft 7 the damping structure cluster spring is set, with the curvilinear motion of cam 15, be converted into 19 pairs of baffle plates of spring, 5 reverse steady propulsions.
2) there has been other fan operation in air and gas system: before the fan starting, not only receive spring 19 elastic thrusts in the valve export side, and the eccentric arm of force effect, and receive the blower fan cigarette wind that other has moved, spigot baffle 5 is closed; Behind fan starting, when opening blower fan to the eccentric arm of force of baffle plate 5 time spent of doing greater than system's cigarette wind-force, baffle plate 5 is rotated counterclockwise unlatching.Because fan pressure is greater than system's cigarette wind pressure, spigot baffle 5 is held open state.
2. when the blower fan automatic closing function of stopping transport---through elastic force and gravity.
1) when air and gas system does not have other fan operation, after this typhoon machine was stopped transport and cut off the power supply, spigot baffle 5 had lost cigarette wind thrust gradually, under the effect of eccentric gravity, was rotated in limiting board 4 position throttle downs along pin naturally; Equilibrium of forces point when overcoming valve wide open, i.e. the effect of baffle plate 5 eccentric gravity can't be brought into play, and the valve closing that will guarantee is provided with 15 ° delay angle to cam 15 specially, is applied to cam 15 thrusts through spring 19, promotes baffle plate 5 and turns clockwise.
2) when there is other fan operation in air and gas system; After a typhoon machine is wherein stopped transport and cut off the power supply,, must guarantee that the stoppage in transit blower fan exports reverse stop valve baffle plate 5 and cuts out in order to prevent the blower fan backflow reversing of stopping transport; Because spigot baffle 5 reverse thrusts lose; At this moment spigot baffle 5 clockwise (oppositely) eccentric arm of force are greater than reverse eccentric arm of force, and baffle plate is under the effect of eccentric arm of force difference, and throttle down turns clockwise; Be applied to cam 15 thrusts through spring 19 simultaneously, promote baffle plate 5 and turn clockwise throttle down.
Except that the foregoing description, the utility model can also have other mode of executions.All employings are equal to the technological scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.
Claims (7)
1. check valve that is used for air and gas system; Mainly contain valve housing, baffle plate and be located in the said valve housing and the baffle plate rotating shaft vertical with airflow direction; Said baffle plate rotating shaft two ends are arranged in the bearing support on the said valve housing; Said baffle plate is installed in the said baffle plate rotating shaft, is respectively equipped with limiting stopper at said baffle plate horizontal position and vertical position; It is characterized in that: said baffle plate rotating shaft is set for the eccentric, eccentric point be arranged at said barrier width 1/4～5/8 between; At least one end of said baffle plate rotating shaft is connected with cam, and said cam outer edge side is provided with elastic damping device, and said elastic damping device contacts with said cam outer rim through push rod.
2. the check valve that is used for air and gas system according to claim 1 is characterized in that: the other end of said baffle plate rotating shaft also is equipped with handle.
3. the check valve that is used for air and gas system according to claim 1; It is characterized in that: said elastic damping device comprises push rod, spring, spring shield, spring fixator; Said spring fixator is installed in the outside of said valve housing; Said spring shield is installed in the below, in said spring shield, is provided with said spring and said push rod successively.
4. the check valve that is used for air and gas system according to claim 1 is characterized in that: said cam thickness is 1～2 times of said push rod diameter, and said cam outer rim is provided with the curved surface groove.
5. the check valve that is used for air and gas system according to claim 4 is characterized in that: said curved surface groove and said push rod termination surface of contact are greater than 45 °
6. the check valve that is used for air and gas system according to claim 1 is characterized in that: said baffle plate both sides are provided with the baffle plate stiffening rib.
7. the check valve that is used for air and gas system according to claim 1 is characterized in that: said baffle plate coupling shaft is round steel or hollow tubular, and external diameter is 20～50mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203665085U CN202280886U (en) | 2011-09-29 | 2011-09-29 | Check valve used for smoke wind system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203665085U CN202280886U (en) | 2011-09-29 | 2011-09-29 | Check valve used for smoke wind system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202280886U true CN202280886U (en) | 2012-06-20 |
Family
ID=46227055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203665085U Expired - Fee Related CN202280886U (en) | 2011-09-29 | 2011-09-29 | Check valve used for smoke wind system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202280886U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113735068A (en) * | 2020-05-29 | 2021-12-03 | 上海梅山钢铁股份有限公司 | Acid mist controller for preventing acid gas from refluxing |
-
2011
- 2011-09-29 CN CN2011203665085U patent/CN202280886U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113735068A (en) * | 2020-05-29 | 2021-12-03 | 上海梅山钢铁股份有限公司 | Acid mist controller for preventing acid gas from refluxing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120620 Termination date: 20190929 |