Tensiometer for soil moisture measurement
阅读：558发布：2020-07-14
专利汇可以提供Tensiometer for soil moisture measurement专利检索，专利查询，专利分析的服务。并且A tensiometer for measuring the moisture content of soil, including a water-filled tube and a reservoir and valve assembly for removing entrapped air from the tube and replacing it with water from the reservoir. An exit passage between the reservoir and the tube is normally sealed by a valve closure on a hollow valve stem. As the stem and closure are moved to an open position, water is drawn through the exit passage to replace most of the air in the tube, and is also pumped into the tube through the hollow valve stem, by means of a plunger moving within a pump chamber in the reservoir. The pumped water sweeps air bubbles from the walls of the tube, and, as the valve stem and closure return to a closed position, water and any remaining air bubbles are drawn out through the hollow valve stem, the exit passage being resealed without application of positive pressure to the water in the tube.，下面是Tensiometer for soil moisture measurement专利的具体信息内容。
1. A tensiometer for measuring soil moisture content, comprising: a sealable vessel normally filled with liquid and having walls with a porous section to be placed in the soil; means connectable to the liquid in said vessel for measuring the pressure therein and hence the moisture content of the soil; liquid reservoir means having an exit to said vessel; and valve means selectively operable for sealing said exit and for opening said exit to allow liquid from said reservoir means to refill said vessel, said valve means including pump means for automatically purging gas bubbles from said vessel, said pump means including means defining a secondary passage from said reservoir means to said vessel when said exit is open, and said pump means being responsive to opening of said valve means, for pumping liquid into said vessel through said secondary passage to thereby sweep gas bubbles from its walls.
2. A tensiometer as set forth in claim 1, further including reservoir cover means for automatically venting said liquid reservoir means in response to operation of said valve means.
3. A tensiometer for measuring soil moisture content, comprising: a sealable vessel normally filled with liquid and having walls with a porous section to be placed in the soil; means connectable to the liquid in said vessel for measuring the pressure therein and hence the moisture content of the soil; liquid reservoir means having an exit to said vessel; valve means selectively operable for sealing said exit and for opening said exit to allow liquid from said reservoir means to refill said vessel, said valve means including means for returning said valve means to a closed position sealing said exit; and pump means for automatically purging gas bubbles from said vessel, said pump means having means defining a secondary passage from said reservoir means to said vessel when said exit is open, and said pump means being responsive to opening of said valve means, for pumping liquid into said vessel to thereby sweep gas bubbles from its walls, and also being operable in a reverse direction to pump liquid and any remaining gas bubbles from said vessel as said valve means is returned to said closed position.
4. A tensiometer for measuring soil moisture content, comprising: a sealable tensiometer tube normally filled with water and having a porous tip to be inserted in the soil; a vacuum gauge connected to the water in said tube to measure the pressure therein and hence the moisture content of the soil surrounding said porous tip; water reservoir means attachable to said tube and having an exit to said tube; and valve means, including a valve closure for sealing said exit in a closed position on movement of said closure outwardly with respect to said tube, said closure also being movable inwardly to an open position to allow water in said water reservoir means to refill said tube, and means coupled with movement of said valve closure, for pumping water into said tube as said valve closure is moved to the open position and pumping water from said tube as said valve closure is returned to the closed position, whereby air bubbles are swept from the tube walls by the water being pumped in as said valve closure is moved to the open position, and are drawn out with the water pumped out as said valve closure is returned to the closed position.
5. A tensiometer as set forth in claim 4, further including reservoir cover means for sealing said water reservoir means and for automatically venting and resealing sAid water reservoir means in response to operation of said valve means.
6. A tensiometer as set forth in claim 4, wherein said means for pumping water into and from said tube include: an auxiliary passage connecting said water reservoir means and said tube; means for opening said auxiliary passage simultaneously with opening said valve closure and for closing said auxiliary passage simultaneously with closing said valve closure; and pump means responsive to the movement of said valve closure for pumping water through said auxiliary passage.
7. A tensiometer as set forth in claim 6, wherein: said valve means include a hollow valve stem attached to said valve closure and extending through said exit; and said hollow valve stem forms part of said auxiliary passage and has a first opening to said pump means and a second opening adjacent said valve closure, whereby water is pumped through said hollow valve stem on movement of said valve closure.
8. A tensiometer as set forth in claim 4, further including: actuating means connected with said valve closure; and resilient means urging said valve closure toward said closed position.
9. A tensiometer for measuring soil moisture content, comprising: a sealable tensiometer tube normally filled with water and having upper and lower ends and a porous bulb at its lower end to be inserted in the soil; a vacuum gauge connected to the water in said tube to measure the pressure therein and hence the moisture content of the soil surrounding said porous bulb; a water reservoir attached to said upper end of said tube and having an exit passage to said tube; a valve assembly for controlling flow through said exit passage, including a valve closure for sealing said exit passage on upward movement of said closure into said exit passage, a hollow valve stem extending through said exit passage and having a lower end attached to said valve closure, a lower opening near said valve closure, and an upper opening substantially above said lower opening, a pump chamber within said water reservoir and surrounding a portion of said valve stem and said upper opening, a plunger connected with said valve stem above said upper opening and fitted in said pump chamber to pump water through said valve stem between said pump chamber and said tube on movement of said valve closure between a closed position and an open position, resilient means urging said valve closure into said closed position, and actuating means connected with said valve stem for opening and closing said valve closure, whereby, on slight movement from said closed position, water from said reservoir enters said tube and entrapped air escapes through said exit passage, and, on further movement toward said open position, water is pumped from said pump chamber through said hollow valve stem to energe through said lower opening and sweep air bubbles from the walls of said tube, and, as said valve closure returns to said closed position, water and air bubbles are pumped back into said pump chamber as said valve closure reseals said exit passage without application of positive pressure on the water in said tube.
10. A tensiometer as set forth in claim 9, further including: a cover over said water reservoir and said valve assembly, said cover having an opening engageable with said actuating means, to vent and reseal said water reservoir automatically in response to operation of said actuating means.
| 标题 | 发布/更新时间 | 阅读量 |
|---|---|---|
| 可控制及模拟大气自然环境的大气-植被-土体试验系统 | 2020-05-12 | 132 |
| 一种土壤分层特征获取方法及应用 | 2020-05-12 | 887 |
| 一种基于多重分形的土壤水分特征曲线模拟方法 | 2020-05-15 | 457 |
| 一种双模式山洪预警控制系统及方法 | 2020-05-20 | 659 |
| 一种基于多重分形的土壤水分特征曲线模拟方法 | 2020-05-24 | 905 |
| 一种模拟降雨时空变化的边坡试验装置 | 2020-05-20 | 475 |
| 一种自动化滴灌系统 | 2020-05-24 | 139 |
| 测定土壤水力参数的简易装置 | 2020-05-18 | 864 |
| 一种基于土壤水分入渗动态的地下滴灌模拟试验装置 | 2020-05-20 | 463 |
| 一种负水灌溉装置 | 2020-05-14 | 673 |
高效检索全球专利专利汇是专利免费检索,专利查询,专利分析-国家发明专利查询检索分析平台，是提供专利分析，专利查询，专利检索等数据服务功能的知识产权数据服务商。
我们的产品包含105个国家的1.26亿组数据，免费查、免费专利分析。
分析报告
专利汇分析报告产品可以对行业情报数据进行梳理分析，涉及维度包括行业专利基本状况分析、地域分析、技术分析、发明人分析、申请人分析、专利权人分析、失效分析、核心专利分析、法律分析、研发重点分析、企业专利处境分析、技术处境分析、专利寿命分析、企业定位分析、引证分析等超过60个分析角度，系统通过AI智能系统对图表进行解读，只需1分钟，一键生成行业专利分析报告。
QQ群二维码
意见反馈
意见反馈