9results about How to "Eliminate dead space" patented technology

The invention discloses an under-pressure well process pipe column with a blowout prevention function and a construction method of the under-pressure well process pipe column. The under-pressure well process pipe column sequentially comprises a screwed plug, a screen pipe, a multifunctional under-pressure ball seat, a blowout prevention tail pipe valve, a first water distributor, a first packer, a second water distributor, a second packer and a third water distributor from bottom to top; normal water injection of the first to third water distributors is ensured; during plugging, the multifunctional under-pressure ball seat is automatically opened, so that no dead cavity is generated at the lower end of the tubular column. During normal well washing, the ball seat is closed, and water is injected into the water distributors normally. During inverse well flushing, the center channel of the ball seat is opened, and it can be guaranteed that setting can be conducted again during normal water injection. When the underground pipe column needs to be lifted, the strong magnetic ball suction pipe is put, and the lower end of the pipe column does not form a dead cavity, so that the strong magnetic ball suction pipe can smoothly move downwards; the bottom reversely seals the lower end opening of the inner sliding sleeve of the blowout prevention tail pipe valve, reliable blocking is achieved, and then underground pipe columns can be pulled out of a well mouth one by one under pressure for maintenance.

This invention relates to the field of bookshelf technology, and more specifically discloses an adjustable shelf spacing library book anti-tipping storage bookshelf, including a bookshelf component. The bookshelf component includes a bookshelf body, with T-shaped grooves on both side walls of the bookshelf body. The bookshelf body is divided into a book placement layer and an adjustable top layer. Multiple arrays of moving components are slidably connected between the T-shaped grooves. A detection box and a control unit are fixedly connected to the outer side wall of the moving components. A monitor is fixedly connected to the outer side of the top wall of the bookshelf body. This invention, by including the bookshelf component, moving components, and detection box, facilitates the setting of an adjustable top layer and adopts a mechanism where the movement of one layer drives the linkage of all upper layers. Combined with timed center of gravity monitoring, it ensures a safety margin when adjusting the shelf spacing, achieving the optimal center of gravity position. When the center of gravity is too high, the lower layers are appropriately reduced to decrease the safety margin of the lower layers, effectively preventing the bookshelf from tipping over due to imbalance of the center of gravity.

The present disclosure provides a water treatment device and a hemodialysis system. The water treatment device includes: a primary reverse osmosis component, including a primary water inlet, a primary concentrated water outlet and a primary pure water outlet; a primary water inlet pipeline connected to the primary water inlet; a primary water inlet booster pump, arranged in the primary water inlet pipeline; a primary waste discharge pipeline connected to the primary concentrated water outlet; a primary concentrated water return pipeline connecting the primary concentrated water outlet and the primary water inlet; a secondary reverse osmosis component, including a secondary water inlet, a secondary concentrated water outlet and a secondary pure water outlet; a secondary water inlet pipeline connecting the primary pure water outlet and the secondary water inlet; a secondary water inlet booster pump, arranged in the secondary water inlet pipeline; a secondary concentrated water return pipeline connecting the secondary concentrated water outlet and the secondary water inlet and connecting the secondary concentrated water outlet and the primary water inlet; a rear-stage water supply pipeline, used to connect with the water-using equipment and connect the secondary pure water outlet with the primary water inlet pipeline.

The upper end of a multifunctional ball seat with pressure is connected with a blowout prevention tail pipe valve in a screwed mode, the blowout prevention tail pipe valve comprises an outer sealing sleeve located in a valve body outer barrel, an expanding hole is formed in the center of the upper portion of the outer sealing sleeve, and an in-valve annular channel is arranged between the portion below an upper sealing section and the valve body outer barrel; an outer sealing sleeve liquid discharge hole is formed in the middle lower part; the inner sliding sleeve is located in the inner cavity of the outer sealing sleeve, an inner sliding sleeve outer convex ring is arranged on the periphery of the upper end of the inner sliding sleeve and supported on the inner wall of the upper portion of the outer sealing sleeve expanding hole, and an inner sliding sleeve drainage hole communicated with the outer sealing sleeve drainage hole is formed in the lower middle portion of the inner sliding sleeve; and the inner sliding sleeve shear pin fixes the inner sliding sleeve. During normal well washing, the ball seat is closed. And during inverse well flushing, the ball seat is opened. When the underground pipe columns need to be pulled out, the strong magnetic ball suction pipe is put in until the strong magnetic ball suction pipe is inserted into the blowout prevention tail pipe valve to suck up the low-density iron ball until the lower end opening of the inner sliding sleeve of the blowout prevention tail pipe valve is reversely sealed, reliable blocking is achieved, and then the underground pipe columns can be pulled out of a well mouth one by one under pressure for maintenance.

The application discloses a kind of air purifiers with whole house cruise function, it is related to air purifier technical field, including purifier main body and the cruise base being installed to its bottom;The purifier main body is sequentially distributed with fan cavity, purification cavity, drive cavity from top to bottom, the inside of the purification cavity is sequentially distributed with activated carbon filter screen, photocatalytic cylinder and multiple ultraviolet lamps from outside to inside;The photocatalytic cylinder is drivenly connected by with intermittent drive mechanism in the drive cavity, the intermittent drive mechanism drives the photocatalytic cylinder intermittent rotation around multiple ultraviolet lamps;The outside of the photocatalytic cylinder is provided with multiple brushes that are slid with it and adhere;The outside of the purifier main body is provided with protection mechanism, and the protection mechanism includes unfolded state and folded state.The application uses intermittent drive mechanism to cooperate brush, prolongs air reaction time while realizing the automatic dust removal of photocatalytic cylinder and effect.

The application relates to the technical field of building engineering monitoring, in particular to a building construction safety monitoring method and system based on sensors, which comprises the following steps: collecting real-time displacement monitoring data of each monitoring point of a building structure through a displacement sensor array, calculating the displacement value difference between each sensor node and its adjacent sensor node based on the real-time displacement monitoring data, and obtaining the displacement gradient value between the nodes; comparing the displacement gradient value between the nodes with a preset gradient threshold value, and activating the sensor array reconstruction mechanism when the displacement gradient value exceeds the preset gradient threshold value. In the monitoring process, the displacement gradient is used as a trigger signal to drive the idle nodes to automatically migrate to the high deformation gradient area, the dynamic matching of the sensor density and the deformation intensity is realized, the deformation capturing capability and the response speed of the monitoring area are improved, the corrected set is generated by fusing the strain and displacement data, the noise is filtered by using the time sequence correlation degree, the environmental interference is eliminated, and the stability of the monitoring data is ensured.

The invention discloses an under-pressure well downhole pipe plugging tool and an under-pressure operation method thereof.The under-pressure well downhole pipe plugging tool comprises a plugging working barrel used for plugging of a plug, the lower end of the plugging working barrel is connected with a multifunctional under-pressure ball seat in a screwed mode, and the ball seat comprises a ball seat outer barrel, a ball seat containing body and a steel ball; the lower end of the ball seat body abuts against an inner step in the middle of the ball seat outer cylinder, a horn mouth is formed in the center of the upper end, and the top is embedded in a cylinder body of the inner wall of the upper portion of the ball seat outer cylinder and limited by a clamp spring. The steel ball is used for setting the horn mouth at the upper end of the ball seat body; the supporting liquid inlet ring is fixed to an inner cavity of the lower middle portion of the ball seat outer cylinder. The upper ejector rod penetrates through the center hole of the ball seat body, the upper end of the upper ejector rod abuts against the bottom of the steel ball, and the lower end of the upper ejector rod penetrates through the center hole of the supporting liquid inlet ring; the ejector rod spring is sleeved on the lower reducing section of the upper ejector rod, the upper end of the ejector rod spring abuts against the lower portion of the outer step of the upper ejector rod, and the lower end of the ejector rod spring is supported on the supporting liquid inlet ring. When a down-hole pipe column is lifted under pressure, the blanking plug is put into the plugging working barrel to be in place when encountering resistance; the pawl is opened, and double-stage sealing is achieved through the expanding type leather cup and the compression rubber barrel.

The utility model relates to the technical field of fermented bean curd, specifically relates to a multilayer fermented bean curd fermentation frame, including multigroup vertical interval arrangement's through -and -through tray, the inside lower side wall fixed limit strip for supporting embedded hole -like board of tray, the both sides of hole -like board are equipped with pull rope and is convenient for to extract, the rotating plate of rotating groove is fixed in the middle of tray one end, the rotating bearing installed in the groove is arranged on the outside of support column and forms the rotating pivot, need to operate when horizontally pulling tray, rotating bearing rotates along the support column and makes the layer to slide outward, through pull rope to take out hole -like board and its carried bean curd blank, complete detection or replacement operation in open space, after reset, hole -like board returns to limit strip fixed, multilayer tray keeps vertical ventilation state, the structure will traditional longitudinal operation change into horizontal operation, eliminate the need of interlayer reserved arm operating space, make interlayer distance need only satisfy the thickness of bean curd blank and bearing structure, significantly improve the stacking density and capacity in the same space.

The invention relates to multifunctional in-situ repair hydrogel based on a modified dermal matrix as well as a preparation method and application of the hydrogel. The hydrogel is formed by crosslinking a first polymer precursor and a second polymer precursor through dynamic covalent bonds of boric acid ester, the first polymer precursor is carboxymethyl chitosan grafted with a phenylboronic acid group and an epsilon-polylysine chain segment; the second polymer precursor is a soluble acellular dermal matrix which is grafted with a 3, 4-dihydroxyphenyl propionic acid group and is subjected to enzymolysis treatment. The hydrogel disclosed by the invention has good biocompatibility, moldability and potential self-healing capability.