CN111044291B - Oil flushing method and device for large and medium diesel engine test bed lubricating oil system - Google Patents
Oil flushing method and device for large and medium diesel engine test bed lubricating oil system Download PDFInfo
- Publication number
- CN111044291B CN111044291B CN201911258922.1A CN201911258922A CN111044291B CN 111044291 B CN111044291 B CN 111044291B CN 201911258922 A CN201911258922 A CN 201911258922A CN 111044291 B CN111044291 B CN 111044291B
- Authority
- CN
- China
- Prior art keywords
- oil
- pipeline
- way
- parabolic
- lubricating oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003921 oil Substances 0.000 title claims abstract description 135
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 48
- 239000010687 lubricating oil Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 239000012535 impurity Substances 0.000 claims abstract description 31
- 239000000835 fiber Substances 0.000 claims abstract description 12
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims 1
- 238000005086 pumping Methods 0.000 claims 1
- 238000004140 cleaning Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000007689 inspection Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The invention belongs to the technical field of diesel engine experimental instruments, and discloses an oil flushing method and device for a large and medium diesel engine test bed lubricating oil system.A first three-way valve is communicated with an oil way B, and after the oil way B is communicated, lubricating oil reversely flows along a pipeline and reversely returns to an oil way A through the oil way; the oil returns to the oil tank through the three-way valve and an oil return pipeline, the oil in the oil tank is pumped by the oil pump for circulation, and the impurity particles are filtered by the filter and the filter; putting the combined body into a pipeline, and fixing the combined body by using an oil-resistant fiber rope; when the liquid flow flows from the left, most of the liquid flow enters from the notch of the flow deflector and is blocked by the length of the adjacent flow deflector, and the liquid flow impacts the other end along the parabolic curved surface of the adjacent flow deflector and impacts impurity particles attached to the joint of the pipeline wall and the flange all the time to take away the impurity particles. The invention adopts bidirectional oil flushing, so that impurity particles are subjected to the front impact of low-frequency alternating liquid flow in a pipeline and are easy to fall off and then are taken away by the liquid flow.
Description
Technical Field
The invention belongs to the technical field of diesel engine experimental instruments, and particularly relates to an oil flushing method and device for a large and medium diesel engine test bed lubricating oil system.
Background
Currently, the closest prior art: the existing large and medium diesel engine test bed adopts a low-pressure unidirectional oil flushing method, which is caused by the following two reasons: 1. the pipe diameter of the lubricating oil system of the diesel engine is too large, and a plurality of oil cavity walls are too thin, so that the mode of high-pressure turbulent oil flushing cannot be adopted. 2. If the pressure grade design of the lubricating oil system of the diesel engine test bed is improved, turbulent oil flushing is conveniently realized, the cleanliness of a lubricating oil pipe system is further improved, and the construction cost of the test bed is inevitably overlarge. The unidirectional low-pressure oil flushing only can form advection oil flushing, only can flush away impurity particles facing to liquid flow, but not flush away impurity particles facing away from the liquid flow, and the impact direction angle of the liquid flow to the impurity particles is too small and the force is too weak. Therefore, the problem of serious residual of impurity particles exists in the one-way impurity particle cleaning method for oil flushing of the existing test bed lubricating oil system.
In summary, the problems of the prior art are as follows: the method for one-way cleaning of impurity particles in oil flushing of the existing test bed lubricating oil system has the problem of serious residue of impurity particles.
The difficulty of solving the technical problems is as follows: under the condition of the preset design pressure of a lubricating oil system pipeline, the liquid flow turbulence can not be generated by increasing the pressure by more than three times, so that the effective impact force of the lubricating oil liquid flow is improved, and the adhesive force between impurity particles and the inner surface of the system is damaged.
Under the condition that the pipe diameter of the lubricating oil system is designed to be a given pipe diameter, the flow turbulence can not be generated by increasing the flow by more than two times, so that the effective impact force of the lubricating oil flow is improved, and the adhesive force between the impurity particles and the inner surface of the system is damaged.
A significant proportion of the foreign particles adhering to the internal surfaces of the system must be dislodged by the impact of the alternating load and thus be carried away by the fluid flow.
The significance of solving the technical problems is as follows: under the condition of not improving the pressure and the flow of a lubricating oil system of a large and medium diesel engine test bed, a pump and a pipe system in the system are utilized to generate turbulence and effective impact force to destroy the adhesive force between impurity particles and the inner surface of the system, so that the impurity particles fall off and are finally taken away by liquid flow, and the oil flushing is economic and efficient.
The test bed lubricating oil system is connected with the large and medium diesel engine, and can also be used for flushing and cleaning impurity particles in the lubricating oil system of the diesel engine body.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an oil flushing method and device for a lubricating oil system of a large and medium diesel engine test bed. The invention overcomes the defects of the background technology, provides the lubricating oil cleaning device which is simple and reasonable in structure, and can effectively solve the problem that impurity particles in a one-way lubricating oil cleaning system are seriously remained.
The invention is realized in this way, and the oil filling method of the lubricating oil system of the large and medium diesel engine test bed comprises the following steps:
firstly, a first three-way valve is communicated with an oil way B, and after the first three-way valve is communicated, lubricating oil reversely flows along a pipeline and reversely returns to an oil way A through the oil way;
step two, the oil returns to the oil tank through a three-way valve and an oil return pipeline, the oil in the oil tank is pumped by the oil pump for circulation, and the impurity particles are filtered by a filter and a filter;
putting the combined body into a pipeline, and fixing the combined body by using an oil-resistant fiber rope; when the liquid flow flows from the left, most of the liquid flow enters from the notch of the flow deflector and is blocked by the length of the adjacent flow deflector, and the liquid flow impacts the other end along the parabolic curved surface of the adjacent flow deflector and impacts impurity particles attached to the joint of the pipeline wall and the flange all the time to take away the impurity particles.
The invention also provides a large and medium diesel engine test bed lubricating oil device for implementing the oil flushing method of the large and medium diesel engine test bed lubricating oil system, wherein the large and medium diesel engine test bed lubricating oil device is provided with a bidirectional oil flushing structure and a turbulent oil flushing structure;
the bidirectional oil flushing structure is provided with an oil pump outlet, the oil pump outlet is provided with a pump outlet oil way, the pump outlet oil way is connected with a stop valve through a pipeline, and the pipeline between the pump outlet oil way and the stop valve is provided with the stop valve and a three-way valve;
the oil return pipeline rear end is provided with a three-way valve part number and an oil return pipeline part number.
Further, turbulent flow oil flushing is provided with a steel bar, the steel bar is provided with a fixing ring and an oil-resistant fiber rope, and the steel bar is welded with the parabolic flow deflector.
Furthermore, the parabola flow deflector is of a lacking edge type.
Furthermore, the parabolic flow deflectors are welded on the steel bar in a reverse-to-forward mode, and the distance between every two adjacent parabolic flow deflectors is one third of the diameter of the liquid flow pipe.
Furthermore, the number of the parabolic flow deflectors is five, six to dozens of parabolic flow deflectors, and the sectional area of each flow deflector is three-quarter of the diameter of the liquid flow pipe.
Further, the length of the steel bar is different from 10 centimeters to 1 meter.
In summary, the advantages and positive effects of the invention are: the invention adopts bidirectional oil flushing, so that impurity particles are subjected to the front impact of low-frequency alternating liquid flow in a pipeline and are easily taken away by the liquid flow after falling off; meanwhile, the parabolic flow deflectors are used, so that liquid flow with large impact force can be easily obtained, and impact on impurity particles attached to the inner wall of the pipeline is increased.
| Item | The method and the equipment of the invention | The existing method | Comparison results |
| Time of flushing oil | 54 hours | 300 hours | The efficiency is improved by 5.6 times |
| Intensity of labour | Very small | Is very strong | Reduce labor intensity |
| Quality of oil flushing | Stabilization | Instability and repetition | Good quality |
| System reliability | Height of | Is low in | High reliability |
| Resulting in cylinder-pulling of diesel engine " | Is free of | Is provided with | Does not cause the test failure of the diesel engine |
Drawings
FIG. 1 is a flow chart of an oil flushing method of a test bed lubricating oil system of a medium and large diesel engine according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a bidirectional oil flushing structure provided by the embodiment of the invention.
Fig. 3 is a schematic diagram of a turbulent oil flushing structure provided by the embodiment of the invention.
Fig. 4 is a schematic structural view of a parabolic guide vane according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a steel bar provided by an embodiment of the invention.
Fig. 6 is a schematic view of a fixed ring structure according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram provided in an embodiment of the present invention.
Fig. 8 is a schematic structural diagram provided in the embodiment of the present invention.
In the figure: 1. a first three-way valve; 2. An oil return line; 3. an oil outlet pipeline; 4. A stop valve; 5. A second three-way valve; 6. a parabolic deflector; 7. a steel bar; 8. a fixing ring; 9. oil-resistant fiber ropes.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention overcomes the defects of the background technology, provides the lubricating oil cleaning device which is simple and reasonable in structure, and can effectively solve the problem that impurity particles in a one-way lubricating oil cleaning system are seriously remained. Meanwhile, the invention has the obvious function of cleaning foreign particles in the lubricating oil system of the large diesel engine test bed, and has strong impact force and high use efficiency.
The technical solution of the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the oil flushing method for the lubricating oil system of the test bed of the medium and large diesel engine provided by the embodiment of the invention specifically comprises the following steps:
s101: the first three-way valve is communicated with the oil way B, and after the first three-way valve is communicated, the lubricating oil reversely flows along the pipeline and reversely returns to the oil way A through the oil way.
S102: the oil returns to the oil tank through the three-way valve and the oil return pipeline, the oil in the oil tank is pumped away by the oil pump for circulation, and the impurity particles are filtered by the filter and the filter.
S103: putting the combined body into a pipeline, and fixing the combined body by using an oil-resistant fiber rope; when the liquid flow flows from the left, most of the liquid flow enters from the notch of the flow deflector and is blocked by the length of the adjacent flow deflector, and the liquid flow impacts the other end along the parabolic curved surface of the adjacent flow deflector and impacts impurity particles attached to the joint of the pipeline wall and the flange all the time to take away the impurity particles.
As shown in fig. 2, the bidirectional oil flushing structure provided by the embodiment of the present invention includes: first three-way valve 1, return oil pipe way 2, go out pump oil pipeline 3, stop valve 4, second three-way valve 5.
A pump outlet oil way 3 is arranged at the outlet of the oil pump, the pump outlet oil way 3 is connected with a stop valve through a pipeline, and the stop valve and a three-way valve are arranged on the pipeline between the pump outlet oil way 3 and the stop valve;
the front end of the oil return pipeline 2 is provided with a three-way valve member number 5.
The oil is flushed according to the figure after the oil is flushed in the positive direction; when oil is flushed reversely, the oil pump is started, the stop valve of part number 4 is unscrewed, the part number 3 and the oil way B are communicated, the part number 5 is screwed, and the part number 2 and the oil way A are communicated. As shown in figure 2, the pipeline of the lubricating oil system is realized by adding the pipeline of the broken line part, and the lubricating oil system can be used for flushing oil in a forward direction and in a reverse direction.
As shown in fig. 3, the turbulent oil flushing structure provided by the embodiment of the present invention includes: the device comprises a parabolic flow deflector 6, a steel bar 7, a fixing ring 8 and an oil-resistant fiber rope 9.
The steel bar 7 is provided with a fixing ring 8 and an oil-resistant fiber rope 9, the steel bar 7 is welded with the parabola flow deflector 6,
preferably, the parabolic deflector 6 is a disc type with a shape similar to a disc, and the edge of the disc type is a parabolic surface, and the gap is used for oil feeding.
Preferably, the steel bar 7 is used for welding the parabolic deflector 6, the fixing ring 8 and the oil-resistant fiber rope 9 are used for pulling the combination of part number 1 and part number 2 to move in the pipeline.
Preferably, the parabolic guide vanes 6 are welded on the steel bar 7 in a reverse-positive mode, and the distance between every two adjacent parabolic guide vanes is one third of the diameter of the liquid flow pipe.
Preferably, the parabolic flow deflectors 6 are used for throwing the liquid flow in the advection direction along the flow guiding surface direction, the number of the flow deflectors is five, six to dozens of the flow deflectors, the cross section area of each flow deflector is three quarters of the diameter of the liquid flow pipe, and the flow deflectors are made of Q235A, as shown in fig. 4.
Preferably, the steel bar 7 is used for installing the guide vane, the length of the guide vane is from 10 centimeters to 1 meter, as shown in fig. 2, and the material Q235A is shown in fig. 5.
The working principle of the invention is as follows: the first three-way valve is communicated with the oil way B, and after the first three-way valve is communicated, the lubricating oil reversely flows along the pipeline and reversely returns to the oil way A through the oil way. The oil returns to the oil tank through the three-way valve and the oil return pipeline, the oil in the oil tank is pumped away by the oil pump for circulation, and the impurity particles are filtered by the filter and the filter. Putting the combined body into a pipeline, and fixing the combined body by using an oil-resistant fiber rope; when the liquid flow flows from the left, most of the liquid flow enters from the notch of the flow deflector and is blocked by the length of the adjacent flow deflector, and the liquid flow impacts the other end along the parabolic curved surface of the adjacent flow deflector and impacts impurity particles attached to the joint of the pipeline wall and the flange all the time to take away the impurity particles.
Fig. 6 is a schematic view of a fixed ring structure according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram provided in an embodiment of the present invention.
Fig. 8 is a schematic structural diagram provided in an embodiment of the present invention.
The present invention will be further described with reference to the experimental effects.
Table 1 shows the oil-flushing inspection results of the present invention, and table 2 shows the oil-flushing inspection results of the present invention. The comparison of the two shows that the invention has high oil flushing efficiency and stable oil flushing quality.
Oil flushing inspection record table 1 of east test bench lubricating oil system
The test person: date: an inspector: date:
MAN32/40 western test bed lubricating oil system oil flushing inspection record table 2
The test person: date: an inspector: date:
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The oil flushing method of the lubricating oil system of the large and medium diesel engine test bed is characterized by comprising the following steps of: the oil flushing structure comprises a bidirectional oil flushing structure and a turbulent oil flushing structure; the two-way oil flushing structure comprises: the oil way A is connected with the oil return pipeline (2) through the second three-way valve (5), one end of the pump oil outlet pipeline (3) is connected with an oil pump outlet, the other end of the pump oil outlet pipeline is connected with the oil way B, and the stop valve (4) and the first three-way valve (1) are arranged on the pump oil outlet pipeline (3); the turbulent oil flushing structure comprises: the device comprises a parabolic flow deflector (6), a steel bar (7), a fixing ring (8) and an oil-resistant fiber rope (9); the steel bar (7) is provided with a fixing ring (8) and an oil-resistant fiber rope (9), and the parabolic flow deflector (6) is welded on the steel bar (7); the parabolic flow deflector (6) is of a lacking edge type; the oil flushing method comprises the following steps:
step one, connecting an oil way B and a first three-way valve (1), and after the connection, allowing lubricating oil to flow to an oil way A through an oil tank along a pipeline;
step two, connecting the oil path A and a second three-way valve (5), returning the lubricating oil to the oil tank through an oil return pipeline (2), pumping the lubricating oil in the oil tank by an oil pump for circulation, returning the lubricating oil to the oil path B through an oil outlet pipeline (3), and filtering impurity particles by a filter arranged on a pipeline;
step three, placing the turbulent flow oil flushing structure into a pipeline, and fixing the turbulent flow oil flushing structure by using an oil-resistant fiber rope (9); when the lubricating oil flows through, most of liquid flow flows through the notches of the parabolic flow deflectors (6), and the liquid flow is blocked by the adjacent parabolic flow deflectors, impacts to the other end along the parabolic curved surface of the adjacent parabolic flow deflectors and impacts to impurity particles attached to the wall of the pipeline.
2. The oil flushing method for the lubricating oil system of the large and medium diesel engine test bed according to claim 1, characterized in that the parabolic guide vanes (6) are welded on the steel rod (7) in a reverse-to-forward mode, and the distance between two adjacent parabolic guide vanes (6) is one third of the diameter of the liquid flow pipe.
3. The oil flushing method of the lubricating oil system of the test bed of the medium and large diesel engine as claimed in claim 1, characterized in that the number of the parabolic flow deflectors (6) is five, six to tens of the parabolic flow deflectors, and the sectional area of the parabolic flow deflectors (6) is three-fourth of the sectional area of the liquid flow pipe diameter.
4. The oil flushing method for the large and medium diesel engine test bench lubricating oil system according to claim 1, characterized in that the length of the steel bar (7) is 10 cm to 1 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911258922.1A CN111044291B (en) | 2019-12-10 | 2019-12-10 | Oil flushing method and device for large and medium diesel engine test bed lubricating oil system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911258922.1A CN111044291B (en) | 2019-12-10 | 2019-12-10 | Oil flushing method and device for large and medium diesel engine test bed lubricating oil system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111044291A CN111044291A (en) | 2020-04-21 |
| CN111044291B true CN111044291B (en) | 2022-05-06 |
Family
ID=70235410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911258922.1A Active CN111044291B (en) | 2019-12-10 | 2019-12-10 | Oil flushing method and device for large and medium diesel engine test bed lubricating oil system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111044291B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201594038U (en) * | 2009-12-18 | 2010-09-29 | 沈阳黎明航空发动机(集团)有限责任公司 | Overall flushing tester for aircraft engines |
| CN106523068A (en) * | 2016-12-28 | 2017-03-22 | 沪东重机有限公司 | Auxiliary filter system for high-precision lubricating oil of diesel engine |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5869624A (en) * | 1981-10-15 | 1983-04-25 | Hitachi Plant Eng & Constr Co Ltd | Bent pipe portion of granular powder air-transport pipe |
| US7372002B2 (en) * | 2003-08-05 | 2008-05-13 | Matsushita Electric Industrial Co., Ltd. | Fluid heating device and cleaning device using the same |
| CN1303873C (en) * | 2004-12-13 | 2007-03-14 | 西北农林科技大学 | Method for designing turbulent flow anti-blocking douche flow passage structure |
| CN201609703U (en) * | 2009-11-24 | 2010-10-20 | 新疆德安环保科技有限公司 | Venturi turbulent flow powerful rinsing device |
| CN102962232B (en) * | 2012-11-23 | 2015-12-23 | 武汉华液传动制造有限公司 | High-voltage pulse turbulent flow pipeline rinse-system |
| CN103322362A (en) * | 2013-05-16 | 2013-09-25 | 济钢集团有限公司 | Novel anti-flushing T-shaped pipeline bend |
| CN209179877U (en) * | 2018-08-30 | 2019-07-30 | 株洲航发动科南方燃气轮机有限公司 | Turbine oil system flush device |
| CN209530839U (en) * | 2018-11-07 | 2019-10-25 | 湖北保乐生物医药科技有限公司 | A kind of reaction kettle convenient for cleaning |
| CN209244668U (en) * | 2018-12-27 | 2019-08-13 | 中科航星科技有限公司 | Fuel pipe high-voltage pulse scouring table |
-
2019
- 2019-12-10 CN CN201911258922.1A patent/CN111044291B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201594038U (en) * | 2009-12-18 | 2010-09-29 | 沈阳黎明航空发动机(集团)有限责任公司 | Overall flushing tester for aircraft engines |
| CN106523068A (en) * | 2016-12-28 | 2017-03-22 | 沪东重机有限公司 | Auxiliary filter system for high-precision lubricating oil of diesel engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111044291A (en) | 2020-04-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108787650A (en) | A kind of transmitting-receiving ball system and pipeline flush scheme for exhaust gas long-distance transport pipes | |
| CN102829001B (en) | A kind of pre-pressurizing jet-flow pump | |
| CN111044291B (en) | Oil flushing method and device for large and medium diesel engine test bed lubricating oil system | |
| CN109763471B (en) | High-low pressure double-sided pile shoe manifold punching device | |
| CN209334378U (en) | Pipe flushing component | |
| CN215466733U (en) | Quick dredge of concrete conveying pipeline | |
| CN102094677B (en) | Emergency equipment for adverse-slope tracking water drainage and silt discharging in tunnel construction | |
| CN210565377U (en) | Gas turbine compressor washing system | |
| CN209780805U (en) | High-pressure filter | |
| CN211836023U (en) | Airport fire engine hydraulic performance continuous operation test system | |
| CN203756453U (en) | Movable pump station | |
| CN211474309U (en) | Single cylinder diesel oil tank oil-out flange joint structure | |
| CN206925102U (en) | The specific purpose tool of Quick dredging fan air channel | |
| CN201673771U (en) | Inner cavity device of independent oil tank single-group flushing finned radiator or cooler | |
| CN215333311U (en) | Air compressor relief device | |
| CN202001679U (en) | Check valve | |
| CN216420497U (en) | Diameter variable pipeline scaler | |
| CN217911978U (en) | Ship hydraulic pipeline flushing system | |
| CN209943571U (en) | Pipe cleaning valve with detachable barrier | |
| CN219773073U (en) | Sand flushing device for gate slot of hydropower station | |
| CN211693069U (en) | Hydraulic tank purifier | |
| CN210509264U (en) | Mining water seal back-fire relief explosion venting device capable of being overhauled | |
| CN217002061U (en) | Diesel engine oil duct cleaning system | |
| CN212452849U (en) | Sludge suction device suitable for bottom of high-fall gate | |
| CN221322702U (en) | River passive pumping device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Gao Huiyuan Inventor after: Sun Zhihong Inventor after: Hui Peng Inventor after: Zhao Chenhua Inventor after: Wang Qingchuan Inventor before: Gao Huiyuan |
|
| CB03 | Change of inventor or designer information |