CN201818559U - Automatic exhaust reflux valve - Google Patents
Automatic exhaust reflux valve Download PDFInfo
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- CN201818559U CN201818559U CN2010205474586U CN201020547458U CN201818559U CN 201818559 U CN201818559 U CN 201818559U CN 2010205474586 U CN2010205474586 U CN 2010205474586U CN 201020547458 U CN201020547458 U CN 201020547458U CN 201818559 U CN201818559 U CN 201818559U
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Abstract
The utility model relates to the field of protective valves of pumps, particularly discloses an automatic exhaust reflux protective valve of a pump. The valve comprises a valve body, a valve cover, a check valve, a guide rod screw barrel, an upper supporting plate and a lower supporting plate. A throttle valve and an air spill valve are respectively mounted on two sides of the valve body, an exhaust pipe is capable of exhausting when the pump is out of work and is capable of being closed automatically after the pump is started. When the flow in the pump is lower, the check valve can control opening and closing of the throttle valve; and when the flow in the pump is higher, the throttle valve is closed, so that the minimum flow protection of the pump is realized. The automatic exhaust reflux valve can not only exhaust continuously when the pump is stopped but also realize the minimum flow protection of the pump, and further realize comprehensive protection of a low-temperature pump and solve problems of ' erosion' and 'air blockage' of pump.
Description
Technical field
The utility model relates to the Protective valve field of pump, is specifically related to the pump-protecting valve that a kind of automatic vent refluxes.
Background technique
When centrifugal pump was used for boiler feed water, condensed fluid supply, the impeller pressure inside was different, and inlet pressure is lower, and outlet pressure is higher.And the gasification temperature of liquid is related with pressure; Pressure low more (or high more), pairing gasification temperature also low more (or high more).When pump startup and unskilled labourer plant flow, the temperature that liquid enters in the pump is higher than the pairing vapourizing temperature of inlet pressure, partially liq can produce gasification, form bubble, and when bubble is taken to higher regional of pressure by liquid, because the corresponding corresponding raising of gasification temperature, steam can be condensed into liquid again again, and bubble breaks rapidly.At this moment, because the density of gas, liquid differs hundred times, so condense at bubble, moment that volume dwindles suddenly, liquid on every side just rushes at the original shared space of bubble with very high speed, at liquid internal fierce impact takes place.If this phenomenon occurs in the surface of blade, then metallic material is etched because of being subjected to very high impact stress repeatedly, so be called " cavitation erosion ", when the cavitation erosion process takes place, the fierce fluctuation of outlet pressure, the continuity that flows is destroyed, and the flow of pump sharply descends.Pump can be effectively protected in bypass backflow by pump-protecting valve.
But be used for the transporting low temperature medium, reach all pumping units that are compressed into liquid near boiling point, gaseous medium such as liquid gas, propylene, propionic aldehyde, the vapor pressure of this liquid varies with temperature highly significant.General when temperature variation ± 25%, vapor pressure can change ± and 100%～± 200%, physical propertys such as while density of medium, specific heat, latent heat of vaporization also all will change.When for example temperature rose, vapour tension sharply increased, density reduces, specific heat increases, latent heat of vaporization reduces, and makes the easier gasification of liquid gas, and increased inlet pressure and influence pump housing intensity; And for example temperature descends when too much, imbibition groove inner vapor pressure descends thereupon, and when flowing through suction line, also heat up from external world's heat absorption easily, will cause the decline of NPSHa like this, make and suck the cavitation performance deterioration, therefore liquid can take place can not arrange in centrifugar liquid pump, the outlet pressure liter does not get on or very big fluctuation takes place, hydraulic shock sound is arranged in the pump, even the pump housing also vibrates a large amount of vaporizations of the interior liquid of pump and obstruction runner, liquid pump can't be worked on, form " gas is stifled " of liquid pump.Like this, when pump restarted, the pump leaf can not be set up discharge pressure, and pump is done to be changeed, and caused the pump damage.So needing valve discharges the gas that produces continuously.
Summary of the invention
The purpose of this utility model is to provide a kind of automatic vent reflux valve, and it is installed in the centrifugal pump outlet, solves " cavitation " and " gas is stifled " problem of pump simultaneously.
The technical solution of the utility model is as follows: a kind of automatic vent reflux valve, it comprises valve body, valve gap, safety check, the guide rod swivel nut, upper support dish and lower support dish, wherein, valve body has the two-stage ladder on main logical direction up and down stupefied, the flange of safety check upper end can frame on the ladder of valve body upper end is stupefied, and closely contact with valve body, the club shaped structure of safety check lower end is inserted into and is stuck in the lower support disk center through hole of valve body lower end ladder on stupefied, safety check can only be moved upward at upper and lower, center, safety check upper end has groove, and be connected with guide rod swivel nut lower end by the spring A that is arranged in groove, fixedly connected with the central through bore of upper support dish in the upper end of guide rod swivel nut, and at valve gap with after valve body is fixedlyed connected, make the upper support dish be clamped on ladder in the valve gap through hole stupefied on, the cavity inner surface that the valve body upper end is connected with valve gap is equipped with lining, valve body is connected with valve bonnet seal, on upper support dish and the lower support dish some through holes are arranged, can make liquid flow to the other end from an end, have two through holes on the left and right directions between valve body two ladders are stupefied, its right side through hole end is fixedlyed connected with bypass outlet A, the PATENT left side via end is fixedlyed connected with bypass outlet B, in valve body and the formed passage of bypass outlet A, throttle valve is installed, when safety check moves upward, can close throttle valve, the path of blocking-up right side through hole and bypass outlet A, when safety check moves downward, can open throttle valve, make liquid export A by right side through hole and bypass; Valve body and bypass outlet B are fixedly connected to form the outlet pipe passage, in the outlet pipe part in bypass outlet B overflow valve are installed, and can by outlet pipe gas be discharged when air pump inoperative, and behind pump startup, overflow valve is closed outlet pipe.
Described throttle valve comprises operating stem, piston, the controller lid, vortex plug and vortex lining, wherein, the controller lid has through hole for the left side, the cylindrical structure of right openings, have oblique through hole in the middle, pack into successively controller lid of piston and pressure reducing bushing, and closely contact with the controller inwall, the vortex plug is fixedlyed connected with pressure reducing bushing by locking nut, the vortex lining is connected with controller lid right openings end, form piston and the reciprocating sleeve of vortex plug, vortex plug right side has the multistage throttle string, and is complementary with the recess structure of vortex lining, make the vortex plug form liquid flow path in the ordinary course of things, when the vortex plug moves right, closely contact the closing liquid flow channel with the vortex lining; The sealing that is complementary of controller cover back-end diameter and valve body right side through hole internal diameter, point diameter is slightly less than the rear end diameter, form the annular pass with valve body right side through hole, and the oblique through hole that covers by controller is connected with the passage that vortex plug and vortex lining are formed, simultaneously, guarantee that vortex lining external diameter and bypass export the sealing that is complementary of A internal diameter; Be fixedly connected with the operating stem fixed plate in controller lid left side, operating stem one end is fixed on the lower end of operating stem fixed plate by locating stud, the other end is inserted in the through hole of safety check lower end, when guaranteeing that safety check moves up and down, drive operating handle and be axle and move up and down and promote piston and pressure reducing bushing with the locating stud.
Described overflow valve right-hand member is the ladder cylindrical drum, and left end is a circular cone, on the cylindrical drum of overflow valve and circular cone some through holes is arranged, and makes gas flow to the outside from overflow valve inside; On the cylindrical drum of overflow valve, spring B is installed, spring B is stuck between the stupefied and outlet pipe of the ladder of overflow valve right-hand member, when overflow valve was moved to the left, the circular cone in overflow valve left side can export bypass the through hole sealing that is connected with outlet pipe among the B, holddown spring B simultaneously.
Described safety check lower end insert operating handle lead to the hole site be that main logical valve is opened a half, the through hole on valve body right side exports A with bypass and closes, and promptly uses the half trip of this valve.
The throttling string on described vortex plug right side is minimum to be two-stage, and its throttling tandem number is determined by bypass pressure reduction.
Remarkable result of the present utility model is: a kind of automatic vent reflux valve described in the utility model, can be in termination of pumping, the overflow valve of valve body one side is opened continuous exhaust pneumatic wallop under the effect of spring, behind pump startup, overflow valve can closely be closed under the effect of pressure reduction; Simultaneously, the throttle valve of valve body opposite side can be realized the minimum discharge protection of pump, utilizes this valve just can realize the integrated protection of cryopump, solves " cavitation " and " gas is stifled " problem of pump.
Description of drawings
Fig. 1 is an automatic vent reflux valve structural drawing provided by the utility model;
Fig. 2 is a throttle valve enlarged view among Fig. 1;
Fig. 3 is an overflow valve enlarged view among Fig. 1;
Among the figure, 1, valve body; 2, valve gap; 3, upper support dish; 4 guide rod swivel nuts; 5, spring A; 6, throttle valve; 7, safety check; 8, lining; 9, bypass outlet A; 10, vortex lining; 11, controller lid; 12, vortex plug; 13, operating handle; 14, locating stud; 15, pressure reducing bushing; 16, piston; 17, nut A; 18, locating stud A; 19, locating stud B; 20, nut B; 21, locking nut; 22, bypass outlet B; 23, outlet pipe; 24, locating stud C; 25, nut C; 26, overflow valve; 27, lower support dish; 28, spring B; 29, operating stem fixed plate.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Shown in Fig. 1～3, a kind of automatic vent reflux valve, it comprises valve body 1, valve gap 2, safety check 7, guide rod swivel nut 4, upper support dish 3 and lower support dish 27, wherein, valve body 1 is having the two-stage ladder hole on the main logical direction up and down, lower support dish 27 external diameters and valve body 1 stage casing internal diameter are complementary, and be stuck in valve body 1 lower end ladder stupefied on; The flange of safety check 7 upper ends can frame on the ladder of valve body 1 upper end is stupefied, and closely contact with valve body 1, make its sealing, the club shaped structure of safety check 7 lower ends is inserted into the through hole at lower support dish 27 centers, safety check 7 can only be moved upward at upper and lower, center, safety check 7 upper end has groove, and is connected with guide rod swivel nut 4 lower ends by the spring A5 that is arranged in groove; Valve gap 2 has through hole, and it is stupefied that the middle part has ladder, and valve gap 2 is fixedlyed connected with valve body 1 upper end coupling by locating stud A18, nut A17, makes to be stuck in the valve gap 2 stupefied upper support dish 3 central through bores of ladder and to fix also holddown spring A5 with the upper end of guide rod swivel nut 4; The cavity inner surface that valve body 1 upper end is connected with valve gap 2 is equipped with lining 8, can realize being tightly connected of valve body 1 and valve gap 2; On upper support dish 3 and the lower support dish 27 some through holes are arranged, can make liquid flow to the other end from an end.
Have two through holes on the left and right directions coaxial line of valve body 1 between two ladders are stupefied, wherein the right side through hole end is fixedlyed connected with bypass outlet A9 by locating stud B19, nut B20, and the PATENT left side via end is fixedlyed connected with bypass outlet B22 by locating stud C24, nut C25; In valve body 1 and the formed passage of bypass outlet A9, throttle valve 6 is installed, throttle valve 6 comprises operating stem 13, piston 16, controller lid 11, vortex plug 12 and vortex lining 10, wherein, controller lid 11 has through hole for the left side, the cylindrical structure of right openings, have oblique through hole in the middle, piston 16 and the pressure reducing bushing 15 controller lid 11 of packing into successively, and closely contact with controller 11 inwalls, vortex plug 12 is fixedlyed connected with pressure reducing bushing 15 by locking nut 21, vortex lining 10 covers 11 right openings ends with controller and is connected, and forms piston 16 and vortex plug 12 reciprocating sleeves, and vortex plug 12 centers have through hole, the right side has the throttling string, and be complementary with the recess structure of vortex lining 10, make vortex plug 12 form liquid flow path in the ordinary course of things, when vortex plug 12 moves right, closely contact with vortex lining 10, the closing liquid flow channel, wherein, the progression of the throttling string in the vortex plug 12 is determined by bypass pressure reduction; Controller covers the sealing that is complementary of 11 rear end diameters and valve body 1 right side through hole internal diameter, point diameter is slightly less than the rear end diameter, form the annular pass with valve body 1 right side through hole, and the passage of forming by the oblique through hole on the controller lid 11 and vortex plug 12 and vortex lining 10 is connected, simultaneously, guarantee that vortex lining 10 external diameters and bypass export the sealing that is complementary of A9 internal diameter; Cover 11 left sides at controller and be fixedly connected with operating stem fixed plate 29, operating stem 13 1 ends are fixed on the lower end of operating stem fixed plate 29 by locating stud 14, the other end is inserted in the through hole of safety check 7 lower ends, when guaranteeing that safety check 7 moves up and down, driving operating handle 13 is that axle moves up and down and promotes piston 16 and pressure reducing bushing 15 with locating stud 14.
Automatic vent reflux valve working procedure described in the utility model is: in the time of air pump inoperative, overflow valve 26 is discharged gas by outlet pipe 23 under the effect of spring B 28; Behind pump startup, overflow valve 26 is closely closed outlet pipe 23, simultaneously automatically under the effect of pressure reduction, under fluid pressure differential, overcome the elasticity of spring A5 and the gravity of safety check 7, safety check 7 is moved upward, and drive operating handle 13 serves as axially to go up motion with locating stud 14, promote piston 16 and decompression lining 15, vortex plug 12 is moved right, the throttling string of vortex plug 12 is contacted with vortex lining 10 internal surfaces compress, close its passage; When the minimum that is lower than pump when the process requirements flow requires flow, the variation of safety check 7 sensitive flows moves downward, and drive operating handle 13 serves as axially motion down with locating stud 14, vortex plug 12 and piston 16 move to bypass outlet A9 left side under the effect of unbalanced force, make vortex plug 12 and vortex lining 10 form passage, guarantee the necessary minimum discharge of liquid pump with this, prevent the damage that pump causes owing to overheated, serious noise and cavitation when low-load moves.When the automatic vent reflux valve is used for centrifugal pump, preferably only use the half trip of this valve, promptly open a half when main logical valve, bypass is promptly closed; Throttle valve is minimum to be two-stage throttling string data reduction valve, and throttling tandem number and bypass pressure reduction are complementary in its reduction valve.
Claims (5)
1. automatic vent reflux valve, it comprises valve body (1), valve gap (2), safety check (7), guide rod swivel nut (4), upper support dish (3) and lower support dish (27), wherein, valve body (1) has the two-stage ladder on main logical direction up and down stupefied, the flange of safety check (7) upper end can frame on the ladder of valve body (1) upper end is stupefied, and closely contact with valve body (1), the club shaped structure of safety check (7) lower end is inserted into and is stuck in lower support dish (27) central through bore of valve body (1) lower end ladder on stupefied, safety check (7) can only be moved upward at upper and lower, center, safety check (7) upper end has groove, and be connected with guide rod swivel nut (4) lower end by the spring A (5) that is arranged in groove, fixedly connected with the central through bore of upper support dish (3) in the upper end of guide rod swivel nut (4), and at valve gap (2) with after valve body (1) is fixedlyed connected, make upper support dish (3) be clamped on ladder in valve gap (2) through hole stupefied on, the cavity inner surface that valve body (1) upper end is connected with valve gap (2) is equipped with lining (8), valve body (1) and valve gap (2) are tightly connected, on upper support dish (3) and the lower support dish (27) some through holes are arranged, can make liquid flow to the other end from an end, it is characterized in that: have two through holes on the left and right directions coaxial line between valve body (1) two ladder is stupefied, its right side through hole end is fixedlyed connected with bypass outlet A (9), the PATENT left side via end is fixedlyed connected with bypass outlet B (22), in valve body (1) and the formed passage of bypass outlet A (9), throttle valve (6) is installed, when safety check (7) when moving upward, can close throttle valve (6), the path of blocking-up right side through hole and bypass outlet A (9), when safety check (7) when moving downward, can open throttle valve (6), make liquid export A (9) by right side through hole and bypass; Valve body (1) is fixedly connected to form outlet pipe (23) passage with bypass outlet B (22), in outlet pipe (23) part in bypass outlet B (22) overflow valve (26) is installed, can be when air pump inoperative, by outlet pipe (23) gas is discharged, behind pump startup, overflow valve (26) is closed outlet pipe (23).
2. a kind of automatic vent reflux valve according to claim 1, it is characterized in that: described throttle valve (6) comprises operating stem (13), piston (16), controller lid (11), vortex plug (12) and vortex lining (10), wherein, controller lid (11) has through hole for the left side, the cylindrical structure of right openings, have oblique through hole in the middle, piston (16) and pressure reducing bushing (15) the controller lid (11) of packing into successively, and closely contact with controller (11) inwall, vortex plug (12) is fixedlyed connected with pressure reducing bushing (15) by locking nut (21), vortex lining (10) is connected with controller lid (11) right openings end, form piston (16) and the reciprocating sleeve of vortex plug (12), vortex plug (12) right side has the multistage throttle string, and be complementary with the recess structure of vortex lining (10), make vortex plug (12) form liquid flow path in the ordinary course of things, at vortex plug (12) when moving right, closely contact the closing liquid flow channel with vortex lining (10); The sealing that is complementary of controller lid (11) rear end diameter and valve body (1) right side through hole internal diameter, point diameter is slightly less than the rear end diameter, form the annular pass with valve body (1) right side through hole, and the passage of forming by the oblique through hole on the controller lid (11) and vortex plug (12) and vortex lining (10) is connected, simultaneously, guarantee that vortex lining (10) external diameter and bypass export the sealing that is complementary of A (9) internal diameter; Be fixedly connected with operating stem fixed plate (29) in controller lid (11) left side, operating stem (13) one ends are fixed on the lower end of operating stem fixed plate (29) by locating stud (14), the other end is inserted in the through hole of safety check (7) lower end, guarantee safety check (7) when moving up and down, driving operating handle (13) is that axle moves up and down and promotes piston (16) and pressure reducing bushing (15) with locating stud (14).
3. a kind of automatic vent reflux valve according to claim 1, it is characterized in that: described overflow valve (26) right-hand member is the ladder cylindrical drum, left end is a circular cone, on the cylindrical drum of overflow valve (26) and circular cone some through holes is arranged, and makes gas flow to the outside from overflow valve (26) inside; Spring B (28) is installed on the cylindrical drum of overflow valve (26), spring B (28) is stuck between the stupefied and outlet pipe (23) of the ladder of overflow valve (26) right-hand member, when overflow valve (26) when being moved to the left, the circular cone in overflow valve (26) left side can export bypass the through hole sealing that is connected with outlet pipe (23) among the B (22), holddown spring B (28) simultaneously.
4. a kind of automatic vent reflux valve according to claim 1 and 2, it is characterized in that: described safety check (7) lower end insert operating handle (13) lead to the hole site be that main logical valve is opened a half, the through hole on valve body (1) right side and bypass outlet A (9) close, and promptly use the half trip of this valve.
5. a kind of automatic vent reflux valve according to claim 2 is characterized in that: the throttling string on described vortex plug (12) right side is minimum to be two-stage, and its throttling tandem number is determined by bypass pressure reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205474586U CN201818559U (en) | 2010-09-29 | 2010-09-29 | Automatic exhaust reflux valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205474586U CN201818559U (en) | 2010-09-29 | 2010-09-29 | Automatic exhaust reflux valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201818559U true CN201818559U (en) | 2011-05-04 |
Family
ID=43916516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205474586U Expired - Lifetime CN201818559U (en) | 2010-09-29 | 2010-09-29 | Automatic exhaust reflux valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201818559U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852998A (en) * | 2020-06-30 | 2020-10-30 | 江苏大学 | Cavitation suppression wing section device |
| CN113464714A (en) * | 2021-08-02 | 2021-10-01 | 九通集团有限公司 | Pump export minimum flow valve |
| CN113464629A (en) * | 2020-03-31 | 2021-10-01 | 丰田自动车株式会社 | Ventilation device |
-
2010
- 2010-09-29 CN CN2010205474586U patent/CN201818559U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464629A (en) * | 2020-03-31 | 2021-10-01 | 丰田自动车株式会社 | Ventilation device |
| CN113464629B (en) * | 2020-03-31 | 2024-04-02 | 丰田自动车株式会社 | Ventilation device |
| CN111852998A (en) * | 2020-06-30 | 2020-10-30 | 江苏大学 | Cavitation suppression wing section device |
| CN113464714A (en) * | 2021-08-02 | 2021-10-01 | 九通集团有限公司 | Pump export minimum flow valve |
| CN113464714B (en) * | 2021-08-02 | 2023-02-24 | 九通集团有限公司 | Pump export minimum flow valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Beijing Aerospace Petrochemical Technology and Equipment Engineering Corp. Assignor: Beijing Inst. of Aerospace Dynamics Contract record no.: 2014990000588 Denomination of utility model: Automatic exhaust reflux valve Granted publication date: 20110504 License type: Exclusive License Record date: 20140724 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110504 |
|
| CX01 | Expiry of patent term |