CN205877202U - A pneumatic cylinder for toilet automatic flushing device - Google Patents
A pneumatic cylinder for toilet automatic flushing device Download PDFInfo
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- CN205877202U CN205877202U CN201620144556.2U CN201620144556U CN205877202U CN 205877202 U CN205877202 U CN 205877202U CN 201620144556 U CN201620144556 U CN 201620144556U CN 205877202 U CN205877202 U CN 205877202U
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- limiting nozzle
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Abstract
The utility model provides a pneumatic cylinder for toilet automatic flushing device belongs to toilet technical field, problem that the piston of mainly solving prior art can not normally be worked to the in -process that has the motion of pole chamber receives fluid pressure's influence by no pole chamber. Include the cylinder body, be located piston, piston rod assembly and valve in the cylinder body, its characteristics are: still include flow -limiting nozzle and spring, the flow -limiting nozzle is the middle cylinder that has restricted aperture of opening, its upper portion that lies in the step through -hole at piston center, and the step through -hole at piston center is stretched out to its one end, and the other end is provided with spacing boss, and this spacing boss corresponds with the central interior step of step through -hole of piston, be provided with the flow -limiting nozzle sealing washer between the outer wall of flow -limiting nozzle and the step through -hole inner wall at piston center, the spring is located the space between the blind hole of lower part and the valve of flow -limiting nozzle, and under the spring action, certain clearance is left with the valve upper end in the flow -limiting nozzle bottom.
Description
Technical field
This utility model belongs to water closet technical field, is specifically related to a kind of hydraulic cylinder for automatic flushing device for cistern.
Background technology
In the automatic flushing device of water closet, hydraulic cylinder piston by rodless cavity to rod chamber move during, valve is by a thrust, when this thrust is not enough to the frictional resistance overcoming valve sealing ring, valve is not turned off, and is held open state, now hydraulic cylinder can normally work, until piston arrives the bottom of rod chamber, valve withstands on the bottom of rod chamber makes valve move upward, and valve is closed.
Before bottom piston arrives, if rod chamber pressure increases and the produced active force of liquid flowing of the gap location of valve and piston increases, the thrust then acting on valve increases the most therewith, when thrust is large enough to the frictional resistance overcoming valve sealing ring, valve is forced to close, at this moment the main thoroughfare that pressure fluid flows to rodless cavity via rod chamber is closed, piston cisco unity malfunction, the speed that i.e. piston rod moves out is the slowest, because this reason, the operating pressure of hydraulic cylinder can only be limited in one specific in the range of.
Summary of the invention
This utility model is for the deficiencies in the prior art, it is provided that a kind of valve can adapt to the hydraulic cylinder for automatic flushing device for cistern of the omnidistance normal work of different pressures.
This utility model adopts the technical scheme that for solving above-mentioned technical problem:
A kind of hydraulic cylinder for automatic flushing device for cistern, including cylinder body, it is positioned at the piston of described cylinder body, piston-rod assembly and valve, the balance pipe of connection rodless cavity and rod chamber is had on described piston, being provided with piston packing on the outer wall of piston, described piston is affixed with the tubular article of piston-rod assembly；Described valve is positioned at the bottom of the step through hole of piston centre, and its upper end has blind hole, and institute's open-blind hole hole wall has liquid pass hole, is provided with inclined-plane boss in the middle part of valve outer wall, and described valve bottom is provided with two supporting legs；Described piston-rod assembly includes the tubular article of upper end and the bar portion passed by cylinder bottom of bottom, described bar portion is connected with the horizontal neck in tubular article, described valve is placed in described tubular article, described supporting leg is through the gap tubular article lower inner wall and horizontal neck, and described supporting leg lower end is exposed bottom tubular article；It is characterized in: also include flow-limiting nozzle and spring, described flow-limiting nozzle is the cylinder that centre has metering hole, it is positioned at the top of step through hole of piston centre, the step through hole of piston centre is stretched out in its one end, the other end is provided with positive stop lug boss, and this positive stop lug boss is corresponding with the step in the step through hole of piston centre；It is provided with flow-limiting nozzle sealing ring between outer wall and the step through-hole wall of piston centre of described flow-limiting nozzle；Described spring is in the space between the bottom and the blind hole of valve of flow-limiting nozzle, and under the action of the spring, leaves certain interval with valve upper end bottom flow-limiting nozzle.
This utility model compared with prior art, has the advantages that
This utility model uses flow-limiting nozzle, and arranges spring between flow-limiting nozzle and valve so that piston by rodless cavity during rod chamber moves not the impact of liquid body pressure and can normally work.
Accompanying drawing explanation
Fig. 1 is this utility model structural representation；
Fig. 2 be in Fig. 1 A-A to sectional view.
In figure: 1 flow-limiting nozzle；2 positive stop lug boss；3 balance pipes；4 pistons；5 inclined-plane boss；6 liquid pass holes；7 springs；8 inlet openings；9 bar portions；10 supporting legs；11 tubular articles；12 cylinder bodies；13 valve；14 piston holes；15 piston packings；16 flow-limiting nozzle sealing rings；17 sealing gaskets；18 leakage fluid drams；19 metering holes.
Detailed description of the invention
As depicted in figs. 1 and 2, a kind of hydraulic cylinder for automatic flushing device for cistern, including cylinder body 12, it is positioned at the piston 4 of described cylinder body 12, piston-rod assembly and valve 13, the balance pipe 3 of connection rodless cavity and rod chamber is had on described piston 4, being provided with piston packing 15 on the outer wall of piston, described piston 4 is affixed with the tubular article 11 of piston-rod assembly；Described valve 13 is positioned at the bottom of the step through hole at piston 4 center, and its upper end has blind hole, and institute's open-blind hole hole wall has liquid pass hole 6, is provided with inclined-plane boss 5 in the middle part of valve outer wall, and described valve 13 bottom is provided with two supporting legs 10；Described piston-rod assembly includes the tubular article 11 of upper end and the bar portion 9 passed by cylinder bottom of bottom, described bar portion 9 is connected with the horizontal neck in tubular article 11, described valve 13 is placed in described tubular article 11, described supporting leg 10 is through the gap tubular article 11 lower inner wall and horizontal neck, and described supporting leg 10 lower end is exposed bottom tubular article 11；Also include flow-limiting nozzle 1 and spring 7, described flow-limiting nozzle 1 is the middle cylinder having metering hole 19, it is positioned at the top of step through hole of piston centre, the step through hole of piston centre is stretched out in its one end, the other end is provided with positive stop lug boss 2, and this positive stop lug boss 2 is corresponding with the step in the step through hole of piston centre；It is provided with flow-limiting nozzle sealing ring 16 between outer wall and the step through-hole wall of piston centre of described flow-limiting nozzle 1；In the described spring 7 space between the blind hole of the bottom of flow-limiting nozzle 1 and valve 13, and under spring 7 acts on, bottom flow-limiting nozzle 1, leave certain interval with valve 13 upper end.
Work process:
When piston bar portion 9 reaches extreme position, the supporting leg 10 of valve 13 withstands cylinder base, makes inclined-plane boss 5 closely sealed with piston hole 14, makes fluid path be closed, and flow-limiting nozzle 1, under the effect of spring 7, is in upper limit position.
When the leakage fluid dram 18 of hydraulic cylinder is opened, rodless cavity pressure reduces rapidly, piston 4 moves to rodless cavity under the promotion of fluid pressure, when piston 4 moves to hydraulic cylinder apical position, the metering hole 19 of flow-limiting nozzle 1 is closed by the sealing gasket 17 on hydraulic cylinder top, along with continuing to move to of piston 4, flow-limiting nozzle 1 is backed down valve 13 by promotion.
When hydraulic cylinder leakage fluid dram 18 is closed, due to the effect in piston 4 inner equilibrium hole 3, in rodless cavity, pressure raises rapidly, and piston 4 is pushed to rod chamber, now, the liquid pass hole 6 on valve 13 of the pressure fluid in rod chamber and the metering hole 19 in the middle of flow-limiting nozzle 1 enter rodless cavity.Owing to pressure fluid is when flowing through flow-limiting nozzle 1, produce a pressure drop at flow-limiting nozzle 1 two ends so that acting on the thrust on valve and reduce, be not enough to overcome back-moving spring elastic force to make valve close, valve 13 is still held open state.
When piston bar portion 9 is fully extended, under the effect under the promotion of piston 4 and bottom cylinder body 12 of the supporting leg 10 of valve 13, spring force is overcome to be again switched off.
It is experimentally confirmed, the internal diameter ratio of the internal diameter of cylinder body 12 and the metering hole 19 of flow-limiting nozzle 1 is between 7～12, back-moving spring elastic force be enough to the thrust overcoming the liquid flowing through valve 13 to produce valve, thereby ensures that hydraulic cylinder works is no longer influenced by the impact of loine pressure.
Claims (1)
1. the hydraulic cylinder for automatic flushing device for cistern, including cylinder body (12), it is positioned at the piston (4) of described cylinder body (12), piston-rod assembly and valve (13), the balance pipe (3) of connection rodless cavity and rod chamber is had on described piston (4), being provided with piston packing (15) on the outer wall of piston, described piston (4) is affixed with the tubular article of piston-rod assembly (11)；Described valve (13) is positioned at the bottom of the step through hole at piston (4) center, its upper end has blind hole, having liquid pass hole (6) on the hole wall of institute's open-blind hole, be provided with inclined-plane boss (5) in the middle part of valve outer wall, described valve (13) bottom is provided with two supporting legs (10)；Described piston-rod assembly includes the tubular article (11) of upper end and the bar portion (9) passed by cylinder bottom of bottom, described bar portion (9) is connected with the horizontal neck in tubular article (11), described valve (13) is placed in described tubular article (11), described supporting leg (10) is through the gap tubular article (11) lower inner wall and horizontal neck, and tubular article (11) bottom is exposed in described supporting leg (10) lower end；It is characterized in that: also include flow-limiting nozzle (1) and spring (7), described flow-limiting nozzle (1) is the cylinder that centre has metering hole (19), it is positioned at the top of step through hole of piston centre, the step through hole of piston centre is stretched out in its one end, the other end is provided with positive stop lug boss (2), and this positive stop lug boss (2) is corresponding with the step in the step through hole of piston centre；It is provided with flow-limiting nozzle sealing ring (16) between outer wall and the step through-hole wall of piston centre of described flow-limiting nozzle (1)；Described spring (7) is positioned at the space between the bottom of flow-limiting nozzle (1) and the blind hole of valve (13), and under spring (7) acts on, certain interval is left with valve (13) upper end in flow-limiting nozzle (1) bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620144556.2U CN205877202U (en) | 2016-02-26 | 2016-02-26 | A pneumatic cylinder for toilet automatic flushing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620144556.2U CN205877202U (en) | 2016-02-26 | 2016-02-26 | A pneumatic cylinder for toilet automatic flushing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205877202U true CN205877202U (en) | 2017-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620144556.2U Active CN205877202U (en) | 2016-02-26 | 2016-02-26 | A pneumatic cylinder for toilet automatic flushing device |
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| Country | Link |
|---|---|
| CN (1) | CN205877202U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11208796B2 (en) | 2017-12-28 | 2021-12-28 | Lixil International Pte. Ltd. | Cylinder-piston unit |
-
2016
- 2016-02-26 CN CN201620144556.2U patent/CN205877202U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11208796B2 (en) | 2017-12-28 | 2021-12-28 | Lixil International Pte. Ltd. | Cylinder-piston unit |
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