CN111927975A - Positive pressure pipeline automatic drainage device - Google Patents
Positive pressure pipeline automatic drainage device Download PDFInfo
- Publication number
- CN111927975A CN111927975A CN202010769446.6A CN202010769446A CN111927975A CN 111927975 A CN111927975 A CN 111927975A CN 202010769446 A CN202010769446 A CN 202010769446A CN 111927975 A CN111927975 A CN 111927975A
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- Prior art keywords
- water
- water discharge
- pipe
- discharge pipe
- pipe assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/02—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm
- F16K7/04—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force
- F16K7/07—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force by means of fluid pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0236—Diaphragm cut-off apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/07—Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining
Abstract
The invention discloses an automatic drainage device of a positive pressure pipeline, which comprises a water discharge barrel and a water discharge pipe assembly arranged in the water discharge barrel, wherein the upper end of the water discharge pipe assembly is used for bearing water flow in a piezometer pipe, the lower end of the water discharge pipe assembly is connected to a water outlet of the water discharge barrel, and the middle section or the bottom section of the water discharge pipe assembly is an elastic thin pipe; the structure of the invention can realize the automatic drainage function, has simple structure and low cost, is suitable for mine compressed air system pipelines and water-containing coal seam pressure measuring pipelines, and can quickly and conveniently remove the problems of water accumulation in compressed air pipelines and water accumulation in pressure measuring pipes or other positive pressure pipelines caused by water content of the coal seam to be measured in the coal seam gas pressure measuring process.
Description
Technical Field
The invention relates to the technical field of coal mine safety, in particular to an automatic positive-pressure pipeline drainage device.
Background
The problem that water accumulated in a positive pressure pipeline is difficult to discharge exists in the underground coal mine production process, such as water accumulated in a pressure air pipe in a mine pressure air system or water accumulated in a drill hole in gas pressure measurement;
the mine compressed air system plays an important role in mine safety production and provides power for various underground pneumatic device tools and the like. In the process of pressing air, due to the temperature difference effect, vapor water in the pressing air pipeline can be condensed into liquid water, the liquid water is increased, the effective cross section of a local pipeline in the pressing air pipeline is obviously reduced, even the pipeline is blocked, the pressing air effect is seriously influenced, and therefore, the problem of water blockage in the field pressing air process is very prominent. In order to prevent the problem of water blockage of the compressed air pipeline in the compressed air process, the current general method is as follows: an oil-water separator is arranged at the front end of the pneumatic tool to separate gas from liquid; a liquid discharge valve is arranged at the lower position for discharging liquid at variable time. These methods have disadvantages in that: firstly, the labor intensity is increased; secondly, if the liquid is discharged untimely, the pressure of the pipeline can be lost, thereby affecting the production safety.
In addition, in the gas disaster prevention and control, the gas pressure of the coal bed is one of important parameters for identifying the outburst risk of coal and gas, and the accuracy of gas pressure measurement is crucial to the safe production of mines. The coal seam moisture content is measured in the coal seam gas pressure measuring process, so that water is accumulated in a pressure measuring pipe, and the accuracy of gas pressure measurement is influenced. The existing solutions are two, one is to manually collect accumulated water in the pressure measuring pipe after the pressure gauge is removed, and the gas pressure measurement result is corrected by measuring the accumulated water amount. And this method is not applicable to coal seams with high water content. The other method is that gas and water can be separated by installing a gas-water separation device, but part of the existing gas-water separation device is artificially drained, and if accumulated water in a pressure measuring pipe cannot be timely drained, the accuracy of a gas pressure measuring result is also influenced; the other part is an automatic drainage device, the principle of which is that accumulated water buoyancy is utilized to drive a relevant valve to be opened to realize the drainage function, and the internal structure of the device is complex and is difficult to carry out engineering application.
The positive pressure pipeline automatic drainage device is provided aiming at the problems, the structure can realize automatic drainage, and the device is simple in structure and low in cost.
Disclosure of Invention
In view of the above, the present invention provides an automatic drainage device for positive pressure pipeline, which can realize automatic drainage and has a simple structure and low cost.
The invention discloses an automatic drainage device of a positive pressure pipeline, which comprises a water discharge barrel and a water discharge pipe assembly arranged in the water discharge barrel, wherein the upper end of the water discharge pipe assembly is used for bearing water flow in a piezometer pipe, the lower end of the water discharge pipe assembly is connected to a water outlet of the water discharge barrel, and the middle section or the bottom section of the water discharge pipe assembly is an elastic thin pipe.
Furthermore, a water inlet is formed in the water discharge barrel, and the upper end of the water discharge pipe assembly is not connected with the water inlet and is used for receiving water flow flowing from the water inlet.
Furthermore, the water discharge pipe assembly further comprises a water guide pipe and a water discharge pipe, the elastic thin pipe is connected between the water guide pipe and the water discharge pipe, and the lower end of the water discharge pipe is connected to a water outlet of the water discharge barrel.
Furthermore, the upper end of the water discharge pipe is covered with a conical cap which gradually shrinks upwards, a water through hole is formed in the conical cap, and the conical cap is positioned in the elastic thin pipe.
The water discharging device further comprises a water guide plate connected in the water discharging barrel, wherein the water guide plate is positioned below the water inlet and is used for guiding water flow to the upper port of the water discharging pipe assembly.
Furthermore, the water guide plate is a conical plate which is connected with the inner circle of the water discharging barrel and inclines downwards, the lowest part of the water guide plate is provided with a water guide hole, and the upper end of the water discharging pipe assembly is positioned right below the water guide hole.
The water drainage device further comprises a filter layer arranged in the water drainage barrel, and the filter layer filters water flow before the water flow flows into the water drainage pipe assembly.
The invention has the beneficial effects that:
the automatic drainage device can realize the automatic drainage function, has simple structure and low cost, is suitable for coal beds with large water content, and can quickly and conveniently drain accumulated water in a compressed air pipeline and the problem of accumulated water in a pressure measuring pipe or other positive pressure pipelines caused by the water content of the coal bed to be measured in the coal bed gas pressure measuring process;
the upper end of the water discharge pipe assembly and the water inlet of the water discharge barrel are in a non-contact state, the structure can greatly reduce the pressure difference between the inside and the outside of the water discharge pipe, namely the normal operation of the automatic drainage device can be realized through the liquid medium with lower liquid level in the water discharge barrel, the structure eliminates the influence of air pressure on the automatic drainage device, so that the automatic drainage device can normally work under various positive pressures, and the operation precision of the whole automatic drainage device is improved.
Drawings
The invention is further described below with reference to the figures and examples.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a portion of the structure of FIG. 1;
FIG. 3 is a schematic view of a stress structure of the elastic thin tube 1;
FIG. 4 is a schematic view of a stress structure of the elastic thin tube 2;
FIG. 5 is a schematic view of a stress structure of the elastic thin tube 3;
Detailed Description
FIG. 3 is a schematic view of a stress structure of the elastic thin tube 1; FIG. 4 is a schematic view of a stress structure of the elastic thin tube 2; FIG. 5 is a schematic view of a stress structure of the elastic thin tube 3;
the embodiment provides an automatic drainage device of positive pressure pipeline, including scuttlebutt 1 and install the outlet pipe subassembly 2 in the scuttlebutt, the outlet pipe subassembly upper end is arranged in accepting the rivers in the piezometer pipe, the outlet pipe subassembly lower extreme is connected in the delivery port of scuttlebutt, outlet pipe subassembly middle section or bottom segment are elasticity thin pipe 2 a. The middle section is the middle position between the upper end and the lower end of the water discharge pipe assembly, and the bottom section is the lower end position of the water discharge pipe assembly; when the elastic thin pipe is positioned at the bottom section, the elastic thin pipe is directly connected with a water outlet of the water discharging barrel; the elastic thin tube elastically contracts inwards to be closed when the external pressure is larger, and elastically expands outwards to be opened when the internal pressure is larger; the water discharging barrel can be a round barrel, a square barrel or a barrel-shaped structure with other shapes, the water outlet is arranged at the bottom of the water discharging barrel, the water inlet is arranged at the bottom of the water discharging barrel, and the arrangement positions of the water inlet and the water outlet of the water discharging barrel can be adjusted adaptively based on the actual arrangement structure, which is not described in detail; referring to fig. 1, in the present embodiment, the automatic drainage of a gas pressure measurement borehole is taken as an example, and an automatic drainage device and a borehole gas pressure measurement device are installed at a pressure measurement pipe 6 through a tee joint 5; in the using process, liquid media are injected into the water discharging barrel, the elastic thin pipe is immersed into the liquid media, a water injection port can be formed in the side wall of the water discharging barrel and a sealing cover is added to facilitate the injection of the liquid media into the water discharging barrel, the liquid media are preferably water, other liquid media can be selected according to actual pressure requirements, and details are omitted herein; accumulated water in the piezometric tube 6 flows into the water discharge tube assembly through the three-way flow, at the moment, the outer side of the elastic thin tube is subjected to the hydraulic acting force of the liquid medium at the outer side, and the inner side of the elastic thin tube is subjected to the hydraulic acting force of the water flow at the inner side; the connection mode of the upper end of the water discharge pipe assembly is different, and the air pressure received by the inner side and the outer side of the corresponding elastic thin pipe is also different, for example, when the connection structure is shown in fig. 1, the air pressure at the inner side and the outer side of the water discharge pipe assembly 2 is the same, at the moment, the influence of the air pressure on the elastic thin pipe can be ignored, when the upper end of the water discharge pipe assembly 2 is directly connected with the water inlet of the water discharge barrel on the basis of fig. 1, the air pressure at the inner side of the water discharge pipe assembly is the same as the air pressure of a piezometer pipe, the air pressure at the outer side of; in the initial stage, the pressure at the outer side of the elastic thin pipe is ensured to be larger than the pressure at the inner side of the elastic thin pipe, the elastic thin pipe is compressed and contracted to be closed at the moment, the pressure at the inner side of the water discharge pipe assembly is continuously increased along with the continuous flow of accumulated water in the piezometer pipe 6 to the water discharge pipe assembly, and the elastic thin pipe is expanded outwards to be opened to discharge the accumulated water in the water discharge pipe assembly when the pressure at the inner side of the water discharge pipe assembly is larger; the structure can realize the automatic drainage function, is simple in structure and low in cost, is suitable for mine compressed air systems and water-containing coal seam pressure measurement pipelines, can quickly and conveniently remove accumulated water in the compressed air systems and solve the problem of accumulated water in pressure measurement pipes caused by water content in coal seams in the coal seam gas pressure measurement process, and can ensure the gas pressure measurement precision.
In this embodiment, the water discharge barrel 1 is provided with a water inlet 1a, and the upper end of the water discharge pipe assembly is not connected with the water inlet and is used for receiving water flowing from the water inlet. As shown in the combined figure 1, in the actual use process, a water inlet of the water discharging barrel is directly connected with one end of the tee joint in a sealing mode, an inner cavity of the water discharging barrel, an inner cavity of the water discharging pipe assembly and an inner cavity of the piezometric pipe are communicated, namely, the internal and external air pressures of the water discharging pipe assembly are equal, and the internal and external pressure difference of the water discharging pipe is the internal and external hydraulic pressure difference.
In this embodiment, the water discharge pipe assembly 2 further includes a water guide pipe 2b and a water discharge pipe 2c, the elastic thin pipe is connected between the water guide pipe 2b and the water discharge pipe 2c, and the lower end of the water discharge pipe is connected to a water outlet of the water discharge barrel. As shown in the combined figure 1, the water guide pipe 2b is fixedly connected to the inner wall of the water discharge barrel through a support 7, the water discharge pipe is fixedly connected to the bottom of the water discharge barrel, the elastic thin pipe is in a free state between the water guide pipe and the water discharge pipe so as to ensure the stability and reliability of the elastic thin pipe, and the elastic thin pipe is arranged in the middle of the whole water discharge pipe assembly and is beneficial to reducing the impact of internal water flow on the elastic thin pipe when the internal water flow flows.
In this embodiment, the upper end of the water discharge pipe is covered with a tapered cap 2d which gradually decreases upwards, the tapered cap is provided with a water through hole, and the tapered cap 2d is located in the elastic thin pipe. As shown in the combined figure 2, when the elastic thin pipe is compressed and contracts inwards, the conical cap is used as a supporting structure for uniformly supporting the elastic thin pipe in the circumferential direction, so that the connection position of the elastic thin pipe and the water discharge pipe can be effectively protected from being damaged, and the outer circle of the upper end of the water discharge pipe can be provided with a round corner for protecting the elastic thin pipe.
In this embodiment, the water discharging device further comprises a water guide plate 3 connected in the water discharging barrel 1, wherein the water guide plate is located below the water inlet and used for guiding water flow to the upper end opening of the water discharging pipe assembly. The water guide plate is arranged above the water guide pipe 2b and below the water inlet 1a and is used for guiding water flow to accurately flow into the water discharge pipe assembly;
in this embodiment, the water guide plate is a tapered plate connected to the inner circle of the water discharge barrel and inclined downward, the lowest part of the water guide plate is provided with a water guide hole, and the upper end of the water discharge pipe assembly is located right below the water guide hole. At the moment, the water discharging barrel corresponding to the water guide plate is a round barrel, the water guide pipe, the water discharging barrel and the water guide plate are coaxially arranged, and the water guide plate is favorable for gathering water flow and guiding the water flow to the water discharging pipe assembly in a centralized manner.
In this embodiment, the water discharging device further comprises a filter layer 4 arranged in the water discharging barrel, and the filter layer filters the water flow before the water flow flows into the water discharging pipe assembly. Based on the structural arrangement of the water guide plate, the filter layer is directly laid on the water guide plate and used for filtering impurities in water, and the impurities are prevented from entering the water drain pipe assembly to damage the inner wall of the elastic thin pipe.
The present embodiment explains the principle of the automatic water discharging apparatus with the structure of fig. 1;
firstly, a certain amount of water is injected into the water discharging barrel, the outer wall of the elastic thin pipe is immersed in the water, and as shown in the figure 3, the figure 3 shows the state that no water is accumulated in the water discharging pipe assembly, at the moment, the elastic thin pipe is in a closed state, and the elastic thin pipe isThe pressure on the outer surface of the upper part of the pipe can be simplified to P1＝ρWater (W)gh1+ P, wherein h1The distance between the upper part of the elastic thin pipe and the liquid level in the water discharge barrel, g is a gravity constant, P is the gas pressure in the piezometer pipe, and the stress on the outer surface of the upper part of the elastic thin pipe is F1＝P1S1，S1The area of the outer surface of the upper part of the elastic thin tube; the pressure intensity on the inner surface of the upper part of the elastic thin pipe is P, the stress on the inner surface of the upper part of the elastic thin pipe is F ═ PS, and S is the area of the inner surface of the upper part of the elastic thin pipe; the pressure on the outer surface of the middle part of the elastic thin pipe can be simplified to be P2＝ρWater (W)gh2+ P, wherein h2The distance from the middle part of the elastic thin tube to the liquid level in the water discharging barrel is defined, and the stress on the outer surface of the middle part of the elastic thin tube is F2＝P2S2In which S is2The area of the outer surface of the middle part of the elastic thin tube; the pressure on the outer surface of the lower part of the elastic thin pipe can be simplified to P3＝ρWater (W)gh3+ P, wherein h3The distance from the lower part of the elastic thin tube to the liquid level in the water discharging barrel is F3＝P3S3In S3The pressure on the inner surface of the lower part of the elastic thin pipe is P0，P0The pressure is the underground atmospheric pressure, the inner surface of the lower part of the elastic thin pipe is stressed by F0＝P0S0In which S is0Is the inner surface area of the lower part of the elastic thin tube. From the above, it is known that P1>P, the pressure difference between the inside and the outside of the upper part of the elastic thin pipe is rhoWater (W)gh1The pressure difference is small; usually, the gas pressure P in the piezometer tube is far greater than the underground atmospheric pressure P0The gas pressure P can reach several MPa at most, then P3>P0The pressure difference between the inside and the outside of the lower part of the elastic thin pipe is rhoWater (W)gh3+P-P0This pressure difference is large. The stress analysis of the elastic thin tube obtained by the same inner and outer surface areas of the elastic thin tube is shown in FIG. 3, and F can be obtained1>F，F3>F0. At this time, the elastic thin tube wall is stressed by F1>F, the upper part of the elastic thin tube has the tendency of closing inwards, and the middle part of the elastic thin tube is stressed by F2Is still in the closed state,the lower part of the elastic thin tube is stressed by a force F3>F0The lower part of the elastic thin pipe is tightly pressed on the surface of the conical cap, so that the water outlet is blocked; and because the water outlet is provided with the support which has a small diameter and a conical cap, the lower part of the wall of the elastic thin tube cannot be supported by F3And F0To rupture due to the pressure differential; at this time, a closed space is formed inside the water discharging barrel.
When water flows into the water discharge pipe assembly through the three-way flow in the pressure measuring pipe, the pressure on the inner surface of the upper part of the elastic thin pipe is P when water enters the water guide pipe1′＝ρWater (W)gh1' + P, wherein h1The distance between the inner surface of the upper part of the elastic thin pipe and the liquid level in the water guide pipe is ' F ' ═ P ' S; when the liquid level in the water guide pipe rises to h1′＝h1In the time, the stress analysis of the elastic thin tube is shown in figure 4, and the upper part of the elastic thin tube is stressed by F1' -F; when the liquid level in the water guide pipe rises to h'>h1While the upper part of the elastic thin tube is stressed by a force F1′>F, the upper part of the elastic thin pipe tends to be opened outwards, water in the water guide pipe flows to the lower part of the elastic thin pipe through the middle part of the elastic thin pipe when the liquid level in the water guide pipe continues rising, at the moment, the lower part of the upper part of the elastic thin pipe is communicated through the water, and the water in the water guide pipe is discharged through the conical cap under the action of pressure difference between the upper surface of the liquid level in the water guide pipe and the inner surface of the lower part of the silica gel guide pipe; when the liquid level in the water guide pipe is lowered to h1′<h1In the time, the stress analysis of the elastic thin tube is shown in fig. 5, and the upper part of the elastic thin tube is stressed by a force F1′<F, the upper part of the elastic thin pipe has the tendency of inward closing; the pressure on the inner surface of the middle part of the elastic thin tube is P2′＝ρWater (W)gh2' + P, wherein h2The distance between the inner surface of the middle part of the elastic thin tube and the liquid level in the water guide tube is F2＝P2′S2', wherein S2The area of the inner surface of the middle part of the elastic thin tube is expressed by F2′<F2Elastic thin tubeThe closed state is recovered, and the lower part of the elastic thin tube recovers the state shown in figure 2; a closed space is formed inside the water discharging barrel; thereby achieving the purpose of automatic drainage.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. The utility model provides an automatic drainage device of malleation pipeline which characterized in that: the water discharge pipe assembly comprises a water discharge barrel and a water discharge pipe assembly arranged in the water discharge barrel, wherein the upper end of the water discharge pipe assembly is used for receiving water flow in a piezometer pipe, the lower end of the water discharge pipe assembly is connected to a water outlet of the water discharge barrel, and the middle section or the bottom section of the water discharge pipe assembly is an elastic thin pipe.
2. The positive pressure pipeline automatic drainage device according to claim 1, characterized in that: the water discharging barrel is provided with a water inlet, and the upper end of the water discharging pipe assembly is not connected with the water inlet and is used for receiving water flow flowing from the water inlet.
3. The positive pressure pipeline automatic drainage device according to claim 1, characterized in that: the water discharge pipe assembly further comprises a water guide pipe and a water discharge pipe, the elastic thin pipe is connected between the water guide pipe and the water discharge pipe, and the lower end of the water discharge pipe is connected to a water outlet of the water discharge barrel.
4. The positive pressure pipeline automatic drainage device according to claim 3, characterized in that: the upper end of the water discharge pipe is covered with a conical cap which gradually shrinks upwards, a water through hole is formed in the conical cap, and the conical cap is positioned in the elastic thin pipe.
5. The positive pressure pipeline automatic drainage device according to claim 2, characterized in that: the water discharging device also comprises a water guide plate connected in the water discharging barrel, wherein the water guide plate is positioned below the water inlet and is used for guiding water flow to the upper port of the water discharging pipe assembly.
6. The positive pressure pipeline automatic drainage device according to claim 5, characterized in that: the water guide plate is a conical plate which is connected with the inner circle of the water discharging barrel and inclines downwards, the lowest part of the water guide plate is provided with a water guide hole, and the upper end of the water discharging pipe assembly is positioned right below the water guide hole.
7. The positive pressure pipeline automatic drainage device according to claim 1, characterized in that: the water drainage device also comprises a filter layer arranged in the water drainage barrel, and the filter layer filters water flow before the water flow flows into the water drainage pipe assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010769446.6A CN111927975B (en) | 2020-08-03 | 2020-08-03 | Positive pressure pipeline automatic drainage device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010769446.6A CN111927975B (en) | 2020-08-03 | 2020-08-03 | Positive pressure pipeline automatic drainage device |
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| CN111927975A true CN111927975A (en) | 2020-11-13 |
| CN111927975B CN111927975B (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN101156009A (en) * | 2005-04-12 | 2008-04-02 | 艾安·德拉库普·多伊格 | Improvements in valves and pumps |
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| CN105113618A (en) * | 2015-08-21 | 2015-12-02 | 赵爱 | Deodorizing water filter for drainage pipeline |
| CN105626144A (en) * | 2016-03-07 | 2016-06-01 | 安徽理工大学 | Downward coal seam gas pressure measuring and hole drilling automatic water drainage device |
| CN206845973U (en) * | 2017-05-18 | 2018-01-05 | 长沙执先智量科技股份有限公司 | A kind of pinch valve |
| CN108397568A (en) * | 2018-06-05 | 2018-08-14 | 陈重 | A kind of elastomeric valves |
| CN208011097U (en) * | 2018-03-10 | 2018-10-26 | 江苏国农泵业有限公司 | A kind of delivery hose of automatic control flow |
| CN208702572U (en) * | 2018-07-30 | 2019-04-05 | 山西金驹煤电化股份有限公司 | A kind of gas tube jettison gear |
| CN210418412U (en) * | 2019-06-12 | 2020-04-28 | 白轩 | Flow control switch for soft fluid conveying pipe |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3805817A (en) * | 1971-12-13 | 1974-04-23 | S Smith | Sewage flow control system |
| US5205325A (en) * | 1991-11-12 | 1993-04-27 | Piper Oilfield Products, Inc. | Flow control valve |
| CN101156009A (en) * | 2005-04-12 | 2008-04-02 | 艾安·德拉库普·多伊格 | Improvements in valves and pumps |
| RU2006126282A (en) * | 2006-07-19 | 2008-02-10 | Общество с ограниченной ответственностью Научно-производственный центр "Экспресс" (RU) | TOILET UNIT FOR VACUUM TOILET OF A PASSENGER CAR |
| CN201180804Y (en) * | 2008-01-08 | 2009-01-14 | 朱雪林 | Valve |
| CN105113618A (en) * | 2015-08-21 | 2015-12-02 | 赵爱 | Deodorizing water filter for drainage pipeline |
| CN105626144A (en) * | 2016-03-07 | 2016-06-01 | 安徽理工大学 | Downward coal seam gas pressure measuring and hole drilling automatic water drainage device |
| CN206845973U (en) * | 2017-05-18 | 2018-01-05 | 长沙执先智量科技股份有限公司 | A kind of pinch valve |
| CN208011097U (en) * | 2018-03-10 | 2018-10-26 | 江苏国农泵业有限公司 | A kind of delivery hose of automatic control flow |
| CN108397568A (en) * | 2018-06-05 | 2018-08-14 | 陈重 | A kind of elastomeric valves |
| CN208702572U (en) * | 2018-07-30 | 2019-04-05 | 山西金驹煤电化股份有限公司 | A kind of gas tube jettison gear |
| CN210418412U (en) * | 2019-06-12 | 2020-04-28 | 白轩 | Flow control switch for soft fluid conveying pipe |
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|---|---|
| CN111927975B (en) | 2022-10-14 |
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