CN108849414B - Oxygenation anti-clogging infiltrating irrigation system - Google Patents
Oxygenation anti-clogging infiltrating irrigation system Download PDFInfo
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- CN108849414B CN108849414B CN201810638423.4A CN201810638423A CN108849414B CN 108849414 B CN108849414 B CN 108849414B CN 201810638423 A CN201810638423 A CN 201810638423A CN 108849414 B CN108849414 B CN 108849414B
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G25/00—Watering gardens, fields, sports grounds or the like
- A01G25/06—Watering arrangements making use of perforated pipe-lines located in the soil
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C23/00—Distributing devices specially adapted for liquid manure or other fertilising liquid, including ammonia, e.g. transport tanks or sprinkling wagons
- A01C23/04—Distributing under pressure; Distributing mud; Adaptation of watering systems for fertilising-liquids
- A01C23/042—Adding fertiliser to watering systems
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G29/00—Root feeders; Injecting fertilisers into the roots
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G7/00—Botany in general
- A01G7/06—Treatment of growing trees or plants, e.g. for preventing decay of wood, for tingeing flowers or wood, for prolonging the life of plants
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Soil Sciences (AREA)
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Abstract
The invention discloses an oxygenation anti-clogging infiltrating irrigation system, wherein stored water in a water storage tank passes through a filtering device and then sequentially infiltrates into a stratum through a main pipe and a plurality of branch pipes, each branch pipe is provided with an seepage hole, the upstream side wall of each seepage hole is provided with a flow guide surface which gradually inclines backwards, the downstream side wall of each seepage hole is provided with an elastic valve which gradually inclines forwards, and the length of the elastic valve is greater than that of the flow guide surface. When the branch pipe has water pressure, the water pressure forces the elastic valve to turn back and forth, so that the seepage hole is opened. When the machine is stopped, the elastic valve can be tightly attached to the edge of the flow guide surface, so that the seepage hole is completely sealed, and the condition that slurry enters the branch pipe to cause blockage can be prevented. The air supplement process of the negative pressure balance air valve can supplement the air of the root zone, and the oxygen increasing effect of the root zone is achieved.
Description
The technical field is as follows:
the invention belongs to the field of high-efficiency water and water-fertilizer integrated agricultural water saving, and particularly relates to a system capable of improving the utilization rate of water and fertilizer and preventing pipeline blockage.
Background art:
water-saving irrigation is a necessary trend in agricultural development in China. In order to further accelerate popularization and application of water and fertilizer integration technology, a series of good policies are issued by the nation, and the Ministry of agriculture, "implementation scheme for promoting water and fertilizer integration (2016-2020)" proposes to popularize water and fertilizer integration technology in six regions of northeast, northwest China, southwest, facility agriculture and orchards, and mainly uses six crops of corn, wheat, potatoes, cotton, vegetables and fruit trees as key points. The popularization area of the water and fertilizer integrated technology reaches 1.5 hundred million mu in 2020, and 8000 ten thousand mu is newly increased. The first document of the center in 2017 clearly provides that water-saving irrigation technologies such as spray irrigation, drip irrigation and infiltrating irrigation need to be popularized vigorously, the agricultural water-saving popularization strength such as water and fertilizer integration is increased, and the water and fertilizer integration can be comprehensively exerted in thirteen-five periods.
Infiltrating irrigation is another water-saving irrigation technology after sprinkling irrigation and drip irrigation, originates from underground infiltrating irrigation, is one of the most advanced agricultural water-saving irrigation technologies in the world at present, and is one of the main irrigation technologies of water and fertilizer integration. The infiltrating irrigation is a kind of underground micro irrigation, which is to transport water by low pressure pipeline, then to penetrate water into soil at fixed time and quantity according to the growth water demand of crops by irrigation device (microporous infiltrating irrigation pipe) buried in the active layer of crop root system. Therefore, infiltrating irrigation can be seen as a special form of drip irrigation, also known as subsurface drip irrigation. Compared with other irrigation technologies, the infiltrating irrigation technology has the advantages of water saving, land saving, labor saving, low energy consumption and the like, and becomes a main measure in the water-saving irrigation technology.
Although the filtration irrigation technology has the advantages, the filtration irrigation technology is not popularized and used in a large area until now, the main reason is that the filtration irrigation technology has some defects, and in actual conditions, the hardness of irrigation water cannot reach the standard, the growth of microorganisms easily causes blockage, the flow is changed, the water yield is uneven, and the blockage causes the reduction of irrigation quality.
The existing infiltrating irrigation device usually does not have the functions of preventing back suction and stabilizing water pressure, the pipelines are blocked by sucking sundries due to negative pressure generated in the infiltrating irrigation pipeline, and meanwhile, when the water flow pressure is unstable, the water flow cannot be effectively stabilized, so that the large-area popularization and application of the infiltrating irrigation technology are influenced.
The invention content is as follows:
the invention provides an oxygenation anti-clogging infiltrating irrigation system, a method for manufacturing an anti-clogging infiltrating irrigation branch pipe and an anti-clogging infiltrating irrigation structure, aiming at the problems that the branch pipe is easy to be filled with muddy water to cause clogging due to the influence of reverse pressure and the oxygenation is poor in the conventional pipeline irrigation system.
The technical scheme adopted by the invention is as follows: a oxygenation anti-clogging filtration irrigation system and method for making anti-clogging filtration irrigation branch pipe, the water stored in the cistern passes through the main pipe and many branch pipes in order to the inner filtration irrigation of stratum after the filter equipment, each branch pipe sets up the seepage hole separately, and there are valves on the related pipeline, the upstream sidewall of each seepage hole of each branch pipe has flow guiding surfaces which slope backward gradually, the downstream sidewall of each seepage hole has elastic valve which slopes forward gradually, the elastic valve is the arc structure that slopes forward; the length of the elastic valve is greater than that of the flow guide surface, and the elastic valve and the flow guide surface can completely seal each seepage hole in a natural state; moreover, the tail ends of the branch pipes are provided with air inlet and outlet pipes, a layer of gauze is sleeved outside the branch pipes to prevent the valves from being blocked, and the pipe orifices of the air inlet and outlet pipes are higher than the ground; meanwhile, a negative pressure air inlet pipe is upwards arranged on the water inlet pipe communicated with the main pipe, a negative pressure balance air valve is installed on the negative pressure air inlet pipe, and a negative pressure air inlet cover is arranged at the pipe orifice of the negative pressure air inlet pipe.
The delivery port upside of cistern bottom is provided with the coarse filtration device, the delivery port of cistern pass through valve and filter in proper order after with negative pressure intake pipe intercommunication, the negative pressure intake pipe with be responsible for the intercommunication. The upper part of the main pipe is provided with a fertilizer tank, and the negative pressure air inlet pipe is communicated with the lower part of the fertilizer tank.
And a layer of filter screen is wrapped at the outer side of each branch pipe. The head end of each branch pipe is respectively provided with a flow limiting valve.
The upper side of the negative pressure air inlet cover is provided with an air inlet and is covered with a filter layer.
The utility model provides an anti-clogging filtration irrigation structure, the upstream side wall in each seepage flow hole of branch pipe is provided with the water conservancy diversion face that slopes backward gradually, and the downstream side wall in each seepage flow hole is provided with the elasticity valve that slopes forward gradually, the length of elasticity valve is greater than the length of water conservancy diversion face, and elasticity valve and water conservancy diversion face can seal each seepage flow hole completely at natural state moreover. The elastic valve is of a forward inclined arc structure; the outside of the branch pipe is sleeved with a layer of gauze to prevent the valve from being blocked.
A method for manufacturing anti-blocking infiltrating irrigation branch pipe, the inner side of the branch pipe supports the inner wall of the branch pipe through a hard inner mould, and the inner mould is provided with an inner mould hole corresponding to the seepage hole of the branch pipe; heating the branch pipe and the die to a branch pipe softening degree; a semicircular punch is utilized to punch inwards from the outer wall of the branch pipe along the position of the die hole to form a semicircular groove, the upstream side wall of the semicircular groove is connected with the inner wall of the branch pipe, and the downstream side wall of the semicircular groove is disconnected with the inner wall of the branch pipe, so that the inner surface of the semicircular groove is gradually inclined backwards to be used as a flow guide surface, and the semicircular groove is disconnected to form a seepage hole; and the downstream side wall of the seepage hole is provided with an elastic valve which inclines forwards gradually, and the elastic valve and the flow guide surface can completely seal each seepage hole in a natural state. The elastic valve is fixed on the downstream side wall of the seepage hole in a heat sealing mode.
The invention has the following beneficial effects: 1. the invention is characterized in that the upstream side wall of the infiltration irrigation hole of the branch pipe is provided with a guide surface which is gradually inclined backwards, the downstream side wall is provided with an elastic valve which is gradually inclined forwards, the elastic valve and the guide surface can completely seal each infiltration hole in a natural state, and when the branch pipe has water pressure, the water pressure forces the elastic valve to turn back and forth, so that the infiltration hole is opened. When the machine is stopped, a reverse negative pressure phenomenon can be formed in the pipeline, at the moment, the water pressure of the branch pipe disappears and becomes negative pressure, so that the elastic valve can be tightly attached to the edge of the flow guide surface, the seepage hole is completely sealed, and the condition that slurry enters the branch pipe to cause blockage can be prevented.
2. The tail end of each branch pipe in the system is provided with an air inlet and outlet pipe higher than the ground, the air inlet and outlet pipes play a role in exhausting at the initial stage of starting, the negative pressure phenomenon in the branch pipes can be compensated at the moment of shutdown, air is sucked into the branch pipes through the air inlet and outlet pipes, and the power of slurry entering the seepage holes is further weakened.
3. The system is also provided with a negative pressure balance mechanism, so that the air supply process of the negative pressure balance air valve can supplement the air of the root zone during irrigation, and the oxygen increasing effect of the root zone is achieved.
4. The anti-blocking infiltrating irrigation structure is easy to realize, is manufactured automatically, is reasonable in structure, low in cost and good in using effect, and is suitable for popularization and application.
Drawings
FIG. 1 is a schematic sectional view of a filtration irrigation manifold in a non-filtration irrigation state;
FIG. 2 is a schematic sectional view of the filtration irrigation branch pipe in the filtration irrigation state;
FIG. 3 is a schematic cross-sectional view of the negative pressure balancing mechanism;
FIG. 4 is a schematic view of the start-up infiltrating irrigation process of the present invention;
FIG. 5 is a schematic illustration of the shutdown anti-plugging process of the present invention.
In the figure, the reference numeral 1 is a reservoir, 2 is a coarse filtering device, 3 is a filter, 4 is a valve, 5 is a main pipe, 6 is a reducing tee joint, 7 is a flow limiting valve, 8 is a branch pipe, 9 is a seepage hole, 10 is an air inlet and outlet pipe, 11 is a negative pressure air inlet cover, 12 is a negative pressure air inlet pipe, 13 is a negative pressure balance air valve, 14 is a flow guide surface, 15 is an elastic valve, and 16 is a filtering layer.
The specific implementation mode is as follows:
example 1: an oxygen-increasing anti-clogging infiltrating irrigation system and a method for manufacturing an anti-clogging infiltrating irrigation branch pipe are disclosed, and are shown in figures 4 and 5. The water stored in the reservoir 1 passes through the filtering device and then sequentially seeps and irrigates into the stratum through the main pipe 5 and the plurality of branch pipes 8, each branch pipe 8 is respectively provided with a seepage hole 9, and a valve 4 is arranged on the related pipeline. Specifically, a rough filtering device 2 is arranged on the upper side of a water outlet at the bottom of a reservoir 1, the water outlet of the reservoir 1 is communicated with a negative pressure air inlet pipe 12 after sequentially passing through a valve 4 and a filter 3, and the negative pressure air inlet pipe 12 is communicated with a main pipe 5. Meanwhile, referring to fig. 3, a negative pressure intake pipe 12 is provided upward to the water inlet pipe communicating with the main pipe 5, the negative pressure intake pipe 12 is provided with a negative pressure balancing air valve 13, and a pipe orifice of the negative pressure intake pipe 12 is provided with a negative pressure intake cover 11. The fertilizer tank can be arranged at the upper part of the main pipe 5, and the negative pressure balance air valve 13 is added behind the fertilizer tank of the infiltrating irrigation system to adjust and balance the air pressure in the infiltrating irrigation underground pipe, so that the problem of soil negative pressure suction and blockage is solved. The air supply process of the negative pressure balance air valve 13 can supplement the air of the root zone, and the oxygen increasing effect of the root zone is achieved.
Referring to fig. 1 and 2, the upstream side wall of each seepage hole 9 of each branch pipe 8 is provided with a guide surface 14 which is gradually inclined backwards, the downstream side wall of each seepage hole 9 is provided with an elastic valve 15 which is gradually inclined forwards, the length of the elastic valve 15 is greater than that of the guide surface 14, and the elastic valve 15 and the guide surface 14 can completely seal each seepage hole 9 in a natural state; furthermore, an intake/exhaust pipe 10 is provided at the end of each branch pipe 8, and the pipe orifice of each intake/exhaust pipe 10 is higher than the ground. The head ends of the branch pipes 8 are respectively provided with a flow limiting valve 7.
When the branch pipe 8 has water pressure, the elastic valve 15 is forced to turn back and forth by the water pressure because the length of the elastic valve 15 is larger than that of the diversion surface 14, so that the seepage hole 9 is opened. When the machine is stopped, a reverse negative pressure phenomenon can be formed in the pipeline, at the moment, the water pressure of the branch pipe 8 disappears and becomes negative pressure, so that the elastic valve 15 can be tightly attached to the edge of the flow guide surface 14, the seepage hole 9 is completely sealed, and the situation that slurry enters the branch pipe 8 to cause blockage can be prevented. Because the tail end of each branch pipe 8 in the system is provided with the air inlet and exhaust pipe 10 which is higher than the ground, the air inlet and exhaust pipe has an exhaust function at the initial starting-up stage, the negative pressure phenomenon in the branch pipes 8 can be compensated at the moment of shutdown, air is sucked into the branch pipes 8 through the air inlet and exhaust pipes 10, and the power of slurry entering the seepage holes 9 is further weakened.
And a layer of filter screen can be wrapped outside each branch pipe. And an intake port is provided on the upper side of the negative pressure intake hood 11 and covered with a filter layer 16.
Example 2: an anti-blocking infiltrating irrigation structure, referring to fig. 1 and 2, the upstream side wall of each seepage hole 9 of a branch pipe 8 is provided with a guide surface 14 which is gradually inclined backwards, the downstream side wall of each seepage hole is provided with an elastic valve 15 which is gradually inclined forwards, the length of the elastic valve 15 is greater than that of the guide surface 14, and the elastic valve 15 and the guide surface 14 can completely seal each seepage hole 9 in a natural state. The resilient valve 15 is of a forwardly inclined arcuate configuration.
When water passes through, the valve automatically opens under the pressure of the water. When no water passes through the pipeline, the pipeline is in a closed state, and the water seepage hole is sealed. The external pressure is higher than the pressure in the tube in the negative pressure state. However, the presence of the valve structure prevents the ingress of dirt. Meanwhile, a layer of gauze is sleeved on the outer part of the pipe to prevent the valve from being blocked, and the irrigation area of water can be increased to achieve a better infiltrating irrigation effect.
Example 3: a method of making a clogging-resistant infiltrating irrigation branch pipe comprising the steps of:
the first step is as follows: the inner side of the branch pipe 8 supports the inner wall of the branch pipe 8 through a hard inner die, and an inner die hole corresponding to the seepage hole 9 of the branch pipe 8 is formed in the inner die.
The second step is that: heating the branch pipe 8 and the mould to the softening degree of the branch pipe 8; a semicircular groove is formed by inwards punching from the outer wall of the branch pipe 8 along the position of a die hole by using a semicircular punch, the upstream side wall of the semicircular groove is connected with the inner wall of the branch pipe 8, and the downstream side wall of the semicircular groove is disconnected with the inner wall of the branch pipe 8, so that the inner surface of the semicircular groove is gradually inclined backwards to be used as a flow guide surface 14, and the semicircular groove is disconnected to form an seepage hole 9.
The third step: and a gradually inclined elastic valve 15 is arranged on the downstream side wall of the seepage hole 9, and the elastic valve 15 and the flow guide surface 14 can completely seal each seepage hole 9 in a natural state. Referring to fig. 5, the elastic valve 15 can be fixed on the downstream side wall of the seepage hole 9 by means of heat sealing. The anti-blocking infiltrating irrigation structure is easy to realize, is manufactured automatically and has low cost.
Claims (6)
1. The utility model provides an anti filtration irrigation system that blocks up of oxygenation, the water storage in the cistern passes through filter equipment back in proper order through being responsible for and many spinal branchs pipe to the infiltration irrigation in the stratum, and every spinal branch pipe sets up the seepage hole respectively to and be provided with valve, characterized by on relevant pipeline: the upstream side wall of each seepage hole of each branch pipe is provided with a guide surface which is gradually inclined backwards, the downstream side wall of each seepage hole is provided with an elastic valve which is gradually inclined forwards, and the elastic valve is of an arc structure which is inclined forwards; the length of the elastic valve is greater than that of the flow guide surface, and the elastic valve and the flow guide surface can completely seal each seepage hole in a natural state; moreover, the tail ends of the branch pipes are provided with air inlet and outlet pipes, a layer of gauze is sleeved outside the branch pipes to prevent the valves from being blocked, and the pipe orifices of the air inlet and outlet pipes are higher than the ground; meanwhile, a negative pressure air inlet pipe is upwards arranged on the water inlet pipe communicated with the main pipe, a negative pressure balance air valve is installed on the negative pressure air inlet pipe, and a negative pressure air inlet cover is arranged at the pipe orifice of the negative pressure air inlet pipe.
2. The oxygen-increasing anti-clogging filtration irrigation system according to claim 1, characterized in that: the delivery port upside of cistern bottom is provided with the coarse filtration device, the delivery port of cistern pass through valve and filter in proper order after with negative pressure intake pipe intercommunication, the negative pressure intake pipe with be responsible for the intercommunication.
3. The oxygen-increasing anti-clogging filtration irrigation system according to claim 1, characterized in that: the upper part of the main pipe is provided with a fertilizer tank, and the negative pressure air inlet pipe is communicated with the lower part of the fertilizer tank.
4. The oxygen-increasing anti-clogging filtration irrigation system according to claim 1, characterized in that: and a layer of filter screen is wrapped at the outer side of each branch pipe.
5. The oxygen-increasing anti-clogging filtration irrigation system according to claim 1, characterized in that: the head end of each branch pipe is respectively provided with a flow limiting valve.
6. The oxygen-increasing anti-clogging filtration irrigation system according to claim 1, characterized in that: the upper side of the negative pressure air inlet cover is provided with an air inlet and is covered with a filter layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810638423.4A CN108849414B (en) | 2017-04-17 | 2017-04-17 | Oxygenation anti-clogging infiltrating irrigation system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710247197.2A CN107094592B (en) | 2017-04-17 | 2017-04-17 | Oxygenation anti-clogging infiltrating irrigation system and anti-clogging infiltrating irrigation structure |
| CN201810638423.4A CN108849414B (en) | 2017-04-17 | 2017-04-17 | Oxygenation anti-clogging infiltrating irrigation system |
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| CN201710247197.2A Division CN107094592B (en) | 2017-04-17 | 2017-04-17 | Oxygenation anti-clogging infiltrating irrigation system and anti-clogging infiltrating irrigation structure |
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| CN108849414A CN108849414A (en) | 2018-11-23 |
| CN108849414B true CN108849414B (en) | 2020-07-17 |
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| CN201810638423.4A Expired - Fee Related CN108849414B (en) | 2017-04-17 | 2017-04-17 | Oxygenation anti-clogging infiltrating irrigation system |
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| CN201710247197.2A Expired - Fee Related CN107094592B (en) | 2017-04-17 | 2017-04-17 | Oxygenation anti-clogging infiltrating irrigation system and anti-clogging infiltrating irrigation structure |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107094592B (en) * | 2017-04-17 | 2018-06-12 | 华北水利水电大学 | Oxygenation anti-clogging infiltrating irrigation system and anti-clogging infiltrating irrigation structure |
| CN110149878B (en) * | 2019-05-22 | 2022-01-28 | 湛江市佳德科技有限公司 | Intelligent and accurate irrigation device integrating water and fertilizer |
| CN111602546B (en) * | 2020-05-22 | 2022-04-15 | 河北地质大学 | Desertification soil vegetation protector |
| CN112267459B (en) * | 2020-09-26 | 2021-09-24 | 中积兴业建设集团有限公司 | PHC (prestressed high-strength concrete) pipe pile for post grouting |
| CN112715333B (en) * | 2020-12-25 | 2022-04-15 | 河南农业大学 | Water-saving irrigation device |
| CN113661900B (en) * | 2021-08-04 | 2022-09-27 | 河海大学 | Temperature control integrated system for field irrigation and use method thereof |
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| CN1910996A (en) * | 2005-08-08 | 2007-02-14 | 杨安 | Piston type needle valve for infiltration irrigation |
| CN104604645A (en) * | 2014-12-04 | 2015-05-13 | 杭州中艺园林工程有限公司 | Environment-friendly water collecting device used for urban landscaping distributed infiltrating irrigation |
| CN107094592B (en) * | 2017-04-17 | 2018-06-12 | 华北水利水电大学 | Oxygenation anti-clogging infiltrating irrigation system and anti-clogging infiltrating irrigation structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU844672A1 (en) * | 1979-12-20 | 1981-07-07 | Всесоюзное Научно-Производственное Объеди-Нение "Союзводавтоматика" | Siphon water outlet |
| SU1041628A1 (en) * | 1981-11-13 | 1983-09-15 | Rumyantsev Leonid | Watering installation |
| SU1644823A1 (en) * | 1988-11-04 | 1991-04-30 | Всесоюзный Научно-Исследовательский Институт Комплексной Автоматизации Мелиоративных Систем | Water outlet of buried irrigation pipeline |
| CN102009008B (en) * | 2010-10-27 | 2012-07-25 | 福州鑫威扬电子有限公司 | Automatic-adjusting seepage pipe |
| KR101136628B1 (en) * | 2011-09-15 | 2012-04-20 | 김달우 | Home cultivating apparatus capable of cleaning air |
| CN103039323A (en) * | 2011-10-17 | 2013-04-17 | 孔才春 | Infiltrating irrigation system |
| CN103039170A (en) * | 2011-10-17 | 2013-04-17 | 孔才春 | Constant-pressure infiltration irrigation system |
| CN103053384A (en) * | 2013-01-04 | 2013-04-24 | 张振华 | Pressure adjustable type subsurface irrigation system |
| CN206760313U (en) * | 2017-04-17 | 2017-12-19 | 华北水利水电大学 | Oxygenation anti-clogging infiltrating irrigation system and anti-clogging infiltrating irrigation structure |
-
2017
- 2017-04-17 CN CN201710247197.2A patent/CN107094592B/en not_active Expired - Fee Related
- 2017-04-17 CN CN201810638423.4A patent/CN108849414B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1910996A (en) * | 2005-08-08 | 2007-02-14 | 杨安 | Piston type needle valve for infiltration irrigation |
| CN104604645A (en) * | 2014-12-04 | 2015-05-13 | 杭州中艺园林工程有限公司 | Environment-friendly water collecting device used for urban landscaping distributed infiltrating irrigation |
| CN107094592B (en) * | 2017-04-17 | 2018-06-12 | 华北水利水电大学 | Oxygenation anti-clogging infiltrating irrigation system and anti-clogging infiltrating irrigation structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108849414A (en) | 2018-11-23 |
| CN107094592B (en) | 2018-06-12 |
| CN107094592A (en) | 2017-08-29 |
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