CN208348963U - A kind of water trap for gas piping - Google Patents
A kind of water trap for gas piping Download PDFInfo
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- CN208348963U CN208348963U CN201721793224.8U CN201721793224U CN208348963U CN 208348963 U CN208348963 U CN 208348963U CN 201721793224 U CN201721793224 U CN 201721793224U CN 208348963 U CN208348963 U CN 208348963U
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- drainage cavity
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- pedestal
- water trap
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Abstract
The utility model discloses a kind of water traps for gas piping, belong to gas fittings technical field.The water trap includes main drainpipe, secondary drainpipe, overflow pipe, water supply pipe, main drainage cavity and secondary drainage cavity, the bottom end of main drainpipe is inserted by the top of main drainage cavity and is located at the bottom of main drainage cavity, water supply pipe is connected at the top of main drainage cavity, the top of secondary drainpipe is connected at the top of main drainage cavity, the bottom end of secondary drainpipe protrudes into secondary drainage cavity and is located at the bottom of secondary drainage cavity, overflow pipe is connected at the top of secondary drainage cavity, water trap further includes bottom cover and pedestal, the bottom thread of bottom cover and main drainage cavity is sealingly mounted at together, the side wall of bottom cover is equipped with ear mount, the top of pedestal is equipped with through-hole, the bottom of main drainage cavity is passed through through-hole by the top of pedestal and is fixedly mounted on the base, ear mount passes through respectively earns rope and links together with pedestal, secondary drainage cavity is fixedly mounted on the top of pedestal.The utility model improves the service life of water trap.
Description
Technical field
The utility model belongs to gas fittings technical field, in particular to a kind of water trap for gas piping.
Background technique
Smelter is during prepared by coal gas or collection handles at present, in order to avoid the temperature of coal gas is excessively high, usually
Wet processing can be taken to produce, so as to cause a large amount of free water is contained in coal gas.Coal gas during pipeline, due to
Tube wall heat dissipation causes gas temperature to decline, so having promoted the free water in coal gas to condense in the duct forms condensed water, therefore,
Need a kind of equipment that condensed water is discharged.
Typically now using water trap by pipeline condensed water be discharged, common drainage cavity mainly include main drainpipe,
The bottom end of secondary drainpipe, overflow pipe, water supply pipe, main drainage cavity and secondary drainage cavity, main drainpipe is inserted by the top of main drainage cavity
And it is located at the bottom of main drainage cavity, water supply pipe connection is connected on the top of main drainage cavity, the top of secondary drainpipe in main drainage cavity
Top, the bottom end of secondary drainpipe protrudes into secondary drainage cavity and is located at the bottom of secondary drainage cavity, and overflow pipe is connected in secondary drainage cavity
Top.At work, the top of main drainpipe is connected to water trap with gas piping, and is stored in main drainage cavity and secondary drainage cavity
Water makes the water level in winner's drainage cavity cover the bottom end of main drainpipe, and the water level in secondary drainage cavity covers the bottom end of secondary drainpipe,
So that the coal gas in gas piping is lived by water seal without leaking, the condensed water in gas piping then flows into water trap, when
When reaching certain reservoir storage of water trap, the water in water trap are discharged by overflow pipe.
However, being increased using the time with water trap, the bottom of main drainage cavity can accumulate many impurity, these impurity exist
The bottom of main drainage cavity will be caused to corrode during accumulation, the service life of water trap is caused to be restricted.
Utility model content
In order to solve the problems, such as that the water trap service life is lower, the utility model embodiment provides a kind of for gas piping
Water trap.The technical solution is as follows:
The utility model embodiment provides a kind of water trap for gas piping, and the water trap includes main draining
Pipe, secondary drainpipe, overflow pipe, water supply pipe, main drainage cavity and secondary drainage cavity, the bottom end of the main drainpipe is by the main drainage cavity
Top insertion and be located at the bottom of the main drainage cavity, water supply pipe connection is in the top of the main drainage cavity, the pair
At the top of the main drainage cavity, the bottom end of the pair drainpipe is protruded into the secondary drainage cavity and is located at for the top connection of drainpipe
The bottom of the pair drainage cavity, at the top of the secondary drainage cavity, the water trap further includes bottom cover, base for the overflow pipe connection
Seat and cleaning assemblies, the cleaning assemblies include scraper plate and multiple brackets, and each bracket, which is respectively separated, is fixed on the master
On the inner wall of drainage cavity, and each bracket is respectively positioned in same level, and the squeegee sleeve is on the main drainpipe
And be shelved on the bracket, the scraper plate be equipped with flowing hole and with each one-to-one groove of bracket, Ge Gesuo
State groove along the scraper plate outer edge circumferentially, the groove matches with the bracket, the bottom cover and the main row
The bottom thread of water cavity is sealingly mounted at together, and the side wall of the bottom cover is equipped at least two ear mounts, the top of the pedestal
Equipped with through-hole, the bottom of the main drainage cavity passes through the through-hole by the top of the pedestal and is fixedly mounted on the pedestal
On, each ear mount passes through respectively earns rope and links together with pedestal, and the pair drainage cavity is fixedly mounted on the pedestal
Top.
In a kind of implementation of the utility model, the pair drainage cavity includes multiple sub- drainage cavities, each son
It is connected to by transition water pipe between drainage cavity, for sub- drainage cavity described in any two, the top of the transition water pipe is connected to
At the top of a sub- drainage cavity, the bottom of another sub- drainage cavity is protruded into the bottom end of the transition water pipe.
In another implementation of the utility model, the main drainpipe includes coal gas downpipe, stop valve and enters
Water pipe, the bottom end of the coal gas downpipe and the top of the water inlet pipe are linked together by stop valve, the water inlet pipe
Bottom end protrudes into the main drainage cavity and is located at the bottom of the main drainage cavity.
In another implementation of the utility model, the water trap further includes coal gas monitor, the coal gas prison
Device is surveyed to be electrically connected with the stop valve.
In another implementation of the utility model, gas sampling pipe, cock are provided on the coal gas downpipe
Valve passes through the rotation with tube drawing, one end of the probe tube and the coal gas drop leg, the other end of the probe tube is moved back
Plug valve links together with the tube drawing that moves back.
In another implementation of the utility model, the bottom of the bottom cover and each sub- drainage cavity is equipped with
Sewage pipe, the top of the main drainage cavity are equipped with scavenging conduit, and the bottom end of the scavenging conduit protrudes into the main drainage cavity and is located at institute
State the bottom of main drainage cavity.
In another implementation of the utility model, the top of the main drainage cavity and each sub- drainage cavity is equal
Equipped with pressure regulation tube.
In another implementation of the utility model, the main drainage cavity is equipped with for detecting the main drainage cavity
Internal pressure pressure gauge, the inside pressure for detecting the corresponding sub- drainage cavity is equipped in each sub- drainage cavity
The pressure gauge of power.
In another implementation of the utility model, the top of the pedestal is equipped with the gasket of annular, the gasket
It is sleeved in the main drainage cavity, and the gasket is folded between the secondary drainage cavity and the pedestal.
In another implementation of the utility model, the pedestal is steel construction piece.
Technical solution provided by the embodiment of the utility model has the benefit that
Since the bottom of main drainage cavity passes through through-hole by the top of pedestal and is fixedly mounted on the base, and secondary drainage cavity is solid
Dingan County is mounted in the top of pedestal, so the bottom of main drainage cavity is lower than the bottom of secondary drainage cavity, the impurity in water is mainly deposited on
In the bottom cover of main drainage cavity bottom, after bottom cover is corroded, directly the bottom cover being corroded can be disassembled, and more renews
Bottom cover so that water trap can continue to normal use, to improve the service life of water trap.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the cross-sectional view of water trap provided by the embodiment of the utility model；
Fig. 2 is the top cross-sectional view of cleaning assemblies provided by the embodiment of the utility model；
Fig. 3 is the top view of water trap provided by the embodiment of the utility model；
Fig. 4 is the top view of water trap provided by the embodiment of the utility model；
Fig. 5 is the top view of water trap provided by the embodiment of the utility model；
Fig. 6 is the top view of water trap provided by the embodiment of the utility model.
Specific embodiment
It is practical new to this below in conjunction with attached drawing to keep the purpose of this utility model, technical solution and advantage clearer
Type embodiment is described in further detail.
Embodiment
The utility model embodiment provides a kind of water trap for gas piping, as shown in Figure 1, water trap includes master
Drainpipe 11, secondary drainpipe 12, overflow pipe 13, water supply pipe 14, main drainage cavity 2 and secondary drainage cavity 3, the bottom end of main drainpipe 11 by
The bottom of main drainage cavity 2 is inserted into and is located at the top of main drainage cavity 2, and the connection of water supply pipe 14 is in the top of main drainage cavity 2, pair draining
The top of pipe 12 is connected at the top of main drainage cavity 2, and the bottom end of secondary drainpipe 12 protrudes into secondary drainage cavity 3 and is located at secondary drainage cavity 3
Bottom, overflow pipe 13 be connected at the top of secondary drainage cavity 3.
Specifically, the top end opening of overflow pipe 13 and secondary drainpipe 12 can be located in same level, so as to protect
The normal water storage for demonstrate,proving secondary drainage cavity 3 avoids the water in secondary drainage cavity 3 from being discharged too early from overflow pipe 13.
In the present embodiment, water trap further includes bottom cover 21, pedestal 4 and cleaning assemblies, and cleaning assemblies 6 includes 61 He of scraper plate
Multiple brackets 62, each bracket 62 is respectively separated on the inner wall for being fixed on main drainage cavity 2, and each bracket 62 is respectively positioned on same water
In plane, scraper plate 61 is sleeved on main drainpipe 11 and is shelved on bracket 62, scraper plate 61 be equipped with flowing hole 612 and with it is each
The one-to-one groove 611 (referring to fig. 2) of bracket 62, each groove 611 along scraper plate 61 outer edge circumferentially, groove 611
Match with bracket 62, bottom cover 21 and the bottom thread of main drainage cavity 2 are sealingly mounted at together, and the side wall of bottom cover 21 is equipped with extremely
Few two ear mounts 211, the top of pedestal 4 are equipped with through-hole 41, the bottom of main drainage cavity 2 by the top of pedestal 4 pass through through-hole 41 and
It is fixedly mounted on pedestal 4, each ear mount 211 is linked together by earning rope 212 with pedestal 4 respectively, the fixed peace of secondary drainage cavity 3
Mounted in the top of pedestal 4.
In above-mentioned implementation, the bottom of main drainage cavity 2 protrudes from the bottom of secondary drainage cavity 3, i.e., the bottom of main drainage cavity 2
Portion is lower than the bottom of secondary drainage cavity 3.
Since the bottom of main drainage cavity 2 passes through through-hole 41 by the top of pedestal 4 and is fixedly mounted on pedestal 4, and secondary row
Water cavity 3 is fixedly mounted on the top of pedestal 4, so the bottom of main drainage cavity 2 is lower than the bottom of secondary drainage cavity 3, the impurity in water
It is mainly deposited in the bottom cover 21 of main 2 bottom of drainage cavity, after bottom cover 21 is corroded, the bottom cover 21 that will can directly be corroded
The bottom cover 21 for disassembling, and more renewing, so that water trap can continue to normal use, to improve making for water trap
Use the service life.
In above-mentioned implementation, earning rope 212 can be guy wire.
Also, during water trap works normally, scraper plate 61 is shelved on bracket 62, and the water in main drainage cavity 2 can
It can be with rotor segment 61, so that groove when needing to clean the inner wall of main drainage cavity 2 to pass through 612 proper flow of flowing hole
611 alignment brackets 62, scraper plate 61 are taken out, so as to be cleaned by the inner wall of 61 pairs of scraper plate main drainage cavities 2.
Preferably, handle 613 can be welded, on scraper plate 61 in order to which operator holds scraper plate 61.
In the present embodiment, the top of pedestal 4 is equipped with the gasket 43 of annular, and gasket 43 is sleeved in main drainage cavity 2, and pads
Piece 43 is folded between secondary drainage cavity 3 and pedestal 4.
Specifically, gasket 43 can be coaxially arranged with through-hole 41, consequently facilitating the bottom of main drainage cavity 2 is from gasket 43 and leads to
It is passed through in hole 41.
Preferably, pedestal 4 is steel construction piece, to ensure that the structural strength of pedestal 4.
In the present embodiment, secondary drainage cavity 3 may include multiple sub- drainage cavities 31, pass through between every sub- drainage cavity 31
Transition water pipe 15 is connected to, drainage cavity 31 sub- for any two, and the top connection of transition water pipe 15 is in sub- drainage cavity 31
The bottom of another sub- drainage cavity 31 is protruded into top, the bottom end of transition water pipe 15.
Preferably, the cross section of main drainage cavity 2 can be circle, and the cross section of each sub- drainage cavity 31 can be identical for area
Fan annular, multiple sub- drainage cavities 31 along main drainage cavity 2 periphery wall circumferentially so that the structure of water trap can be compared with
It is compact.
The top view of Fig. 3 is secondary drainage cavity when including 2 sub- drainage cavities water trap, referring to Fig. 3, a sub- drainage cavity 31 with
It is connected to, is connected between two sub- drainage cavities 31 by transition water pipe 15, overflow pipe 13 by secondary drainpipe 12 between main drainage cavity 2
It is connected at the top of another sub- drainage cavity 31, the top opening of overflow pipe 13, coupling tube and secondary drainpipe 12 is respectively positioned on same
On horizontal plane.
The top view of Fig. 4 is secondary drainage cavity when including 4 sub- drainage cavities water trap, Fig. 5 is that secondary drainage cavity includes 6 son rows
The top view of water trap when water cavity, the top view of Fig. 6 is secondary drainage cavity when including 8 sub- drainage cavities water trap, these three situations
Under, the connection type between main drainage cavity 2, sub- drainage cavity 31, secondary drainpipe 12, transition water pipe 15 and overflow pipe 13, and above
When secondary drainage cavity 3 include 2 sub- drainage cavities 31 when connection type it is similar, this will not be repeated here.
It should be noted that the quantity of sub- drainage cavity 31 can be according to the operating condition of pressure and water trap in gas piping
Be adjusted, the utility model to this with no restriction.
Referring again to Fig. 1, in the present embodiment, main drainpipe 11 includes coal gas downpipe 111, stop valve 112 and enters water
Pipe 113, the bottom end of coal gas downpipe 111 and the top of water inlet pipe 113 are linked together by stop valve 112, water inlet pipe 113
Bottom end protrudes into main drainage cavity 2 and is located at the bottom of main drainage cavity 2.
In above-mentioned implementation, the top of coal gas downpipe 111 can be connected in the lowest point of gas piping, thus just
Condensed water in gas piping flows into coal gas downpipe 111.
When filling the water into water trap, it is first shut off stop valve 112, so that coal gas downpipe 111 and water inlet pipe 113 are mutual not
Then connection is filled the water by water supply pipe 14 into main drainage cavity 2, and drain winner by secondary drainpipe 12 and transition water pipe 15
Water is filled in chamber 2 and each sub- drainage cavity 31, stop valve 112 is then opened, so that 113 phase of coal gas downpipe 111 and water inlet pipe
It is intercommunicated, under atmospheric pressure, generate liquid level difference between main drainpipe 11 and main drainage cavity 2, secondary drainpipe 12 with it is corresponding
Sub- drainage cavity 31 between generate liquid level difference, generate liquid level difference between transition water pipe 15 and corresponding sub- drainage cavity 31, until row
Level stability in hydrophone gets off, at this time the liquid level difference between main drainpipe 11 and main drainage cavity 2, secondary drainpipe 12 with it is corresponding
Liquid level difference between sub- drainage cavity 31, the liquid level difference between transition water pipe 15 and corresponding sub- drainage cavity 31 be 200mm~
300mm avoids gas leak to meet water sealing condition.
In the present embodiment, water trap further includes coal gas monitor 5, and coal gas monitor is electrically connected with stop valve 112.
In above-mentioned implementation, coal gas monitor 5 may include controller, monitor and alarm, controller and report
Alert device is electrically connected with monitor respectively, and monitor works as coal gas for the gas content in the air on real-time monitoring water trap periphery
When Han Liang is greater than the set value, by controller alarm is sounded an alarm, and stop valve 112 is closed, to close coal
Gas downpipe 111, to avoid the further leakage of coal gas.
In the present embodiment, it is provided with gas sampling pipe 114, plug valve 115 on coal gas downpipe 111 and moves back tube drawing 116,
One end of probe tube is connected to coal gas downpipe 111, and the other end of probe tube is connected to by plug valve 115 with tube drawing 116 is moved back
Together.
When needing sample detection coal gas, plug valve 115 can be then opened, is made by tube socket on moving back tube drawing 116
The coal gas in coal gas downpipe 111 is obtained to pass sequentially through gas sampling pipe 114, plug valve 115 and move back in the importing hose of tube drawing 116.
In the present embodiment, the bottom of main drainage cavity 2 and the bottom of every sub- drainage cavity 31 are equipped with sewage pipe 16, main row
The top of water cavity 2 is equipped with scavenging conduit 17, and the bottom end of scavenging conduit 17 protrudes into main drainage cavity 2 and is located at the bottom of main drainage cavity 2.
In above-mentioned implementation, in order to avoid accumulated impurity in main drainage cavity 2 and each sub- drainage cavity 31, so periodically
It needs by the impurity discharge in main drainage cavity 2 and each sub- drainage cavity 31, due in main drainage cavity 2 and every sub- drainage cavity 31
It is mounted on sewage pipe 16, it can be ensured that the impurity in main drainage cavity 2 and every sub- drainage cavity 31 is quickly discharged, is improved
The efficiency removed contamination.
If sewage can not thoroughly be discharged, tracheae can also be accessed on scavenging conduit 17, thus to miscellaneous in main drainage cavity 2
Matter is purged, thoroughly to clean the impurity of main 2 bottom of drainage cavity.
Preferably, the gas being blown by scavenging conduit 17 can be nitrogen.
In the present embodiment, the top of main drainage cavity 2 and every sub- drainage cavity 31 is equipped with pressure regulation tube 18.
When needing to adjust the pressure of the headspace (space of non-water-filling) in main drainage cavity 2 or sub- drainage cavity 31,
Nitrogen can be imported by corresponding pressure regulation tube 18, to play the role of adjusting water level, with better water seal coal gas.
It should be noted that the pressure regulation tube 18 in each sub- drainage cavity 31 can also play when being necessary that
The effect of purging.
Specifically, it is provided with cutting-off valve on pressure regulation tube 18 and moves back tube drawing, moves back tube drawing and passes through cutting-off valve and pressure
Regulation pipe 18 links together, and moves back tube drawing for covering trachea.
In the present embodiment, main drainage cavity 2 is equipped with the pressure gauge 19 for detecting the internal pressure of main drainage cavity 2, often
The pressure gauge 19 of the internal pressure for detecting corresponding sub- drainage cavity 31 is equipped in a sub- drainage cavity 31.
Preferably, the pressure gauge 19 in main drainage cavity 2 and each sub- drainage cavity 31 is pressure gauge on the spot, so as to just
The pressure of main drainage cavity 2 and each sub- drainage cavity 31 is intuitively obtained in worker.
In the present embodiment, it can wind electric-heating belt in main drainage cavity 2 and secondary drainage cavity 3, so as to avoid draining
Water in device freezes in winter.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (10)
1. a kind of water trap for gas piping, the water trap include main drainpipe, secondary drainpipe, overflow pipe, water supply pipe,
The bottom end of main drainage cavity and secondary drainage cavity, the main drainpipe is inserted by the top of the main drainage cavity and is located at the main draining
The bottom of chamber, the water supply pipe connection are connected on the top of the main drainage cavity, the top of the pair drainpipe in the main row
The top of water cavity, the bottom end of the pair drainpipe protrudes into the secondary drainage cavity and is located at the bottom of the secondary drainage cavity, described to overflow
Flow tube connection is at the top of the secondary drainage cavity, which is characterized in that and the water trap further includes bottom cover, pedestal and cleaning assemblies,
The cleaning assemblies includes scraper plate and multiple brackets, and each bracket is respectively separated the inner wall for being fixed on the main drainage cavity
On, and each bracket is respectively positioned in same level, the squeegee sleeve is on the main drainpipe and is shelved on described
On bracket, the scraper plate be equipped with flowing hole and with each one-to-one groove of bracket, each groove is described in
Circumferentially, the groove matches the outer edge of scraper plate with the bracket, the bottom spiral shell of the bottom cover and the main drainage cavity
Line is sealingly mounted at together, and the side wall of the bottom cover is equipped at least two ear mounts, and the top of the pedestal is equipped with through-hole, described
The bottom of main drainage cavity is passed through the through-hole by the top of the pedestal and is fixedly mounted on the pedestal, each ear mount
It is linked together respectively by earning rope with pedestal, the pair drainage cavity is fixedly mounted on the top of the pedestal.
2. water trap according to claim 1, which is characterized in that the pair drainage cavity includes multiple sub- drainage cavities, each
It is connected to by transition water pipe between the sub- drainage cavity, for sub- drainage cavity described in any two, the top of the transition water pipe
At the top of a sub- drainage cavity, the bottom of another sub- drainage cavity is protruded into the bottom end of the transition water pipe for end connection
Portion.
3. water trap according to claim 2, which is characterized in that the main drainpipe includes coal gas downpipe, stop valve
And water inlet pipe, the bottom end of the coal gas downpipe and the top of the water inlet pipe are linked together by stop valve, it is described enter water
The bottom end of pipe protrudes into the main drainage cavity and is located at the bottom of the main drainage cavity.
4. water trap according to claim 3, which is characterized in that the water trap further includes coal gas monitor, the coal
Gas monitor is electrically connected with the stop valve.
5. water trap according to claim 3, which is characterized in that be provided on the coal gas downpipe gas sampling pipe,
Plug valve passes through institute with tube drawing, one end of the probe tube and the coal gas drop leg, the other end of the probe tube is moved back
Plug valve is stated to link together with the tube drawing that moves back.
6. water trap according to claim 2, which is characterized in that the bottom of the bottom cover and each sub- drainage cavity is equal
Equipped with sewage pipe, the top of the main drainage cavity is equipped with scavenging conduit, and the main drainage cavity and position are protruded into the bottom end of the scavenging conduit
In the bottom of the main drainage cavity.
7. water trap according to claim 2, which is characterized in that the top of the main drainage cavity and each sub- drainage cavity
Portion is equipped with pressure regulation tube.
8. water trap according to claim 2, which is characterized in that the main drainage cavity is equipped with for detecting the main row
The pressure gauge of the internal pressure of water cavity is equipped with for detecting in the corresponding sub- drainage cavity in each sub- drainage cavity
The pressure gauge of portion's pressure.
9. water trap according to claim 1-8, which is characterized in that the top of the pedestal is equipped with the pad of annular
Piece, the gasket are sleeved in the main drainage cavity, and the gasket is folded between the secondary drainage cavity and the pedestal.
10. water trap according to claim 1-8, which is characterized in that the pedestal is steel construction piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721793224.8U CN208348963U (en) | 2017-12-20 | 2017-12-20 | A kind of water trap for gas piping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721793224.8U CN208348963U (en) | 2017-12-20 | 2017-12-20 | A kind of water trap for gas piping |
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| Publication Number | Publication Date |
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| CN208348963U true CN208348963U (en) | 2019-01-08 |
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| CN201721793224.8U Active CN208348963U (en) | 2017-12-20 | 2017-12-20 | A kind of water trap for gas piping |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107893910A (en) * | 2017-12-20 | 2018-04-10 | 江汉大学 | A kind of water trap for gas piping |
-
2017
- 2017-12-20 CN CN201721793224.8U patent/CN208348963U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107893910A (en) * | 2017-12-20 | 2018-04-10 | 江汉大学 | A kind of water trap for gas piping |
| CN107893910B (en) * | 2017-12-20 | 2024-01-05 | 江汉大学 | Drainer for gas pipeline |
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