CN111927975B - Positive pressure pipeline automatic drainage device - Google Patents
Positive pressure pipeline automatic drainage device Download PDFInfo
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- CN111927975B CN111927975B CN202010769446.6A CN202010769446A CN111927975B CN 111927975 B CN111927975 B CN 111927975B CN 202010769446 A CN202010769446 A CN 202010769446A CN 111927975 B CN111927975 B CN 111927975B
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- water
- pipe
- water discharge
- elastic thin
- 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, steam 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, and the pressing air effect is seriously influenced, so that 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 part of the 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 danger of coal and gas, and the accuracy of gas pressure measurement is crucial to the safety 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 having 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, a conical cap which gradually shrinks upwards is covered at the upper end of the water drain pipe, a water through hole is formed in the conical cap, and the conical cap is positioned in the elastic thin pipe.
And the water guide plate is positioned below the water inlet and used for guiding water flow to the upper port of the water drain pipe assembly.
Furthermore, the water guide plate is a conical plate which is connected to the inner circle of the water discharge barrel and inclines downwards, a water guide hole is formed in the lowest position of the water guide plate, and the upper end of the water discharge pipe assembly is located right below the water guide hole.
The water draining device further comprises a filtering layer arranged in the water draining barrel, and the filtering layer filters water flow before the water flow flows into the water draining 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 2a. 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 the detailed description is omitted; 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; for example, when the connection structure shown in fig. 1 is used, the air pressure inside and outside the water discharge pipe assembly 2 is the same, and at this time, 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 inside the water discharge pipe assembly is the same as the air pressure of the piezometer pipe, the air pressure outside the water discharge pipe, that is, the air pressure inside the water discharge barrel is the atmospheric pressure, and the air pressures inside and outside the elastic thin pipe are different; in the initial stage, the pressure of the outer side of the elastic thin pipe is ensured to be larger than the pressure of the inner side of the elastic thin pipe, the elastic thin pipe is compressed and contracted to be closed at the moment, the pressure of the inner side of the water drain pipe assembly is continuously increased when accumulated water in the piezometer pipe 6 continuously flows to the water drain pipe assembly, and the elastic thin pipe is expanded outwards to be opened when the pressure of the inner side of the water drain pipe assembly is larger than the pressure of the outer side to discharge the accumulated water in the water drain pipe assembly; 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, a tapered cap 2d that gradually tapers upward is covered on the upper end of the water discharge pipe, a water through hole is formed in the tapered cap, 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, a water guide hole is formed at the lowest position of the water guide plate, 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 water discharging pipe assembly is in a state without accumulated water in the figure 3, at the moment, the elastic thin pipe is in a closed state, and the pressure applied to the outer surface of the upper part of the elastic thin pipe can be simplified to be P 1 ＝ρ Water (W) gh 1 + P, wherein h 1 The 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 F 1 ＝P 1 S 1 ，S 1 The 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 tube is P, the stress on the inner surface of the upper part of the elastic thin tube is F = PS, and S is the area of the inner surface of the upper part of the elastic thin tube; the pressure on the outer surface of the middle part of the elastic thin pipe can be simplified to be P 2 ＝ρ Water (W) gh 2 + P, wherein h 2 The 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 F 2 ＝P 2 S 2 In which S is 2 The 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 intoP 3 ＝ρ Water (W) gh 3 + P, wherein h 3 The distance from the lower part of the elastic thin tube to the liquid level in the water discharging barrel is defined as F 3 ＝P 3 S 3 In S 3 The pressure on the inner surface of the lower part of the elastic thin pipe is P 0 ，P 0 The pressure is the underground atmospheric pressure, the inner surface of the lower part of the elastic thin pipe is stressed by F 0 ＝P 0 S 0 In which S is 0 Is the inner surface area of the lower part of the elastic thin tube. From the above, it is known that P 1 >P, the pressure difference between the inside and the outside of the upper part of the elastic thin pipe is rho Water (W) gh 1 The pressure difference is small; usually, the gas pressure P in the piezometer tube is far greater than the underground atmospheric pressure P 0 The gas pressure P can reach several MPa at most, then P 3 >P 0 The pressure difference between the inside and the outside of the lower part of the elastic thin pipe is rho Water (W) gh 3 +P-P 0 This 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 obtained 1 >F，F 3 >F 0 . At this time, the elastic thin tube wall is stressed by F 1 >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 F 2 Is still in a closed state, the lower part of the elastic thin tube is stressed by a force F 3 >F 0 The 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 is provided with the conical cap, the lower part of the wall of the elastic thin tube cannot be supported by F 3 And F 0 To 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 pipe 1 ′＝ρ Water (W) gh 1 ' + P, wherein h 1 The 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 h 1 ′＝h 1 In 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 F 1 ' = F; when the liquid level in the water guide pipe rises to h'>h 1 While the upper part of the elastic thin tube is stressed by a force F 1 ′>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 h 1 ′<h 1 In 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 F 1 ′<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 pipe is P 2 ′＝ρ Water (I) gh 2 ' + P, wherein h 2 The distance between the inner surface of the middle part of the elastic thin tube and the liquid level in the water guide tube is F 2 ＝P 2 ′S 2 ', wherein S 2 ' is the internal surface area of the middle part of the elastic thin tube, and the middle part of the elastic thin tube is stressed by F 2 ′<F 2 The elastic thin tube restores the closed state again, and the lower part of the elastic thin tube restores the state shown in figure 2 again; 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 (6)
1. The utility model provides an automatic drainage device of malleation pipeline which characterized in that: the device 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 pressure measuring 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 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 in from the water inlet;
the liquid medium is injected into the water discharging barrel, and the elastic thin pipe is immersed into the liquid medium.
2. 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.
3. The positive pressure pipeline automatic drainage device according to claim 2, 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.
4. The positive pressure pipeline automatic drainage device according to claim 1, characterized in that: the water guide plate is positioned below the water inlet and used for guiding water flow to the upper port of the water drain pipe assembly.
5. The positive pressure pipeline automatic drainage device according to claim 4, 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.
6. The positive pressure pipeline automatic drainage device according to claim 1, characterized in that: the water draining device is characterized by further comprising a filtering layer arranged in the water draining barrel, wherein the filtering layer filters water flow before the water flow flows into the water draining 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 CN111927975A (en) | 2020-11-13 |
| CN111927975B true CN111927975B (en) | 2022-10-14 |
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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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| 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 |
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| 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 |
| CN210418412U (en) * | 2019-06-12 | 2020-04-28 | 白轩 | Flow control switch for soft fluid conveying pipe |
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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 |
| 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 |
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| CN111927975A (en) | 2020-11-13 |
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