37 results about "Fish screen" patented technology

Water intake structures for power plants and other industrial facilities may include an inflow channel, a deep well, an outflow channel, and an intake channel These structures may include a fish screen, such as a wedge-wire screen or the like, positioned between the deep well and the intake channel to separate fish, fish larvae and fish eggs from water supplied to the intake channel from the deep well. These structures may further include one or more circulating or sweep flow pumps positioned proximate an outlet of the outflow channel. The sweep flow pumps may be used to maintain a sweep flow through the deep well of the intake structure to help sweep fish, fish larvae and fish eggs away from the fish screen and into the outflow channel.

Debris adhering to the outer surface of a barrel-type fish screen is cleared by air bursts from a series of perforated air pipes positioned inside the outer foraminous shell of the screen, the perforations being holes with axes at an acute angle to the screen radius for efficient use of the air. Separately, the conical water collection manifold mounted inside the shell is open at its narrow end, with a valve mounted to that open end to control the opening. The opening prevents reduced water inflow at that end of the manifold, and the valve adjusts the access of the surrounding water to the opening, thereby allowing the manifold to be tuned to more closely approach a uniform distribution of axial water flow along the length of the collection manifold for different ambient conditions. Webs joining the air pipes to the collection manifold are also included in certain embodiments of the invention to support increased lengths of the entire apparatus without loss of structural integrity, including support for the foraminous shell.

The invention provides an aquatic animal enhanced surface flow artificial wetland consisting of a water inlet pipe, a perforated water-distributing plate, a bed body, aquatic plants, fish ditches, fish pits, a fish screen and a water outlet pipe. The bed body of the wetland is filled with light and medium loams, the aquatic plants are planted on the bed body, water ditches are dug out on two side surfaces of the bed body to serve as the fish ditches, water pits are dug out in the middle of the surface flow artificial wetland or at two ends of the bed body to serve as the fish pits, and the total area of the fish ditches and the fish pits occupies 20-30% of the area of the bed body. Aquatic animals namely loaches and field snails are added into the wetland to improve the stability of microbial populations in a bed material of the wetland, increase the contact between bed mud and a water body, reduce the accumulation of organic matters of the bed mud, and significantly reduce the turbidity of the water body; and by using the fish ditches and the fish pits, the contact area between the bed body of the wetland and the water body can be increased, and the adsorbing and degrading capacities of the bed material of the wetland to pollutants in the water are increased.

The invention relates to a gas cyclone pollutant collecting culture pond system. An air inlet aerating plug flow system comprises a guide barrel. A baffle plate is fixedly arranged on the inner wall of the guide barrel through a supporting rack, a group of aerating heads are arranged behind the water inlet direction of the baffle plate and the aerating heads are connected to a Roots blower locatedout of the guide barrel through a gas conveying pipe; the water outlet of the guide barrel is formed tangentially in the side wall of the round culture pond; an upper drainage system comprises a triangular downflow weir. The triangular downflow weir is located on the upper parts around the circular culture pond, and a ring of braiding channel is arranged in a position below the triangular downflow weir of the round culture pond; a pollutant collecting pit of a bottom pollution discharge system is located at the lowest position of the center of the bottom of the round culture pond and a net fish screen is horizontally placed on the pollutant collecting pit. The system improves the collecting efficiency of feces and residual feeds in a high density fish pond, so that the pollution load of the fish pond is alleviated; the water inlet power is stable, the water flow stability in the culture pond is relatively high, turbulence is avoided, and growth of fishes in water is facilitated.

The invention discloses a fish screen device based on rice field fish culture. The fish screen device comprises a fish-culture fish screen device, wherein the fish-culture fish screen device comprisesfish screen rods, tops of the fish screen rods are fixedly connected with a fixing station, the top of the fixing station is fixedly connected with middle rods, tops of the middle rods are fixedly connected with limiting top caps, two insertion ports are separately formed inside each fish screen rod, and a fish screen outer plate and a fish screen inner plate are separately inserted inside the corresponding two insertion ports. According to the fish screen device based on rice field fish culture, through the matching among a fish screen inner mesh, a fish screen outer mesh and a fish screen side mesh, fishes in the fish-culture fish screen device are intercepted and are prevented from leaving a culture circle, and thus, the balance of a system is destroyed; and through the matching amongthe meshes, the intercepting effect is improved, cultured fishes are prevented from leaving the culture circle, the advantage of facilitating fish screen is achieved, and the problem of the existing rice field fish culture that the fishes easily leave a culture range, thus, the quantity of the fishes is reduced, thus, the balance of a rice field fish culture system is destroyed, and the yield is reduced is solved.

The invention discloses a fish inlet structure for a fish passing facility and belongs to the field of hydropower engineering. The fish inlet structure which is capable of luring fish in multiple directions and used for the fish passing facility is provided and structurally comprises a cylindrical shell. A cylindrical fish screen is arranged in the shell. An annular fish passing path is formed between the cylindrical fish screen and the shell. A separation fish screen for separating the fish passing path is arranged in the fish passing path. One end of the fish passing path separated by the fish screen penetrates the shell and then communicates with the fish passing facility. Multiple fish inlets are formed in the peripheral direction of the shell at intervals. A stirring mechanism is arranged in the cylindrical fish screen. According to the fish inlet structure for the fish passing facility, the fish inlets distributed in the peripheral direction of the shell are formed, meanwhile water flow generated by stirring of the stirring mechanism can flow along the annular fish passing path, suction water flow in the fish inlet direction is formed at each fish inlet, and multi-direction fish luring is achieved at the same time in the peripheral direction of the shell.

The invention relates to and aims to provide a transferring device between a fishway and a fish van and an implementation method thereof. The invention has the technical scheme that the transferring device consists of a fish collection device and a transshipment device, wherein the fish collection device comprises a fish collection channel; two sides of the fish collection channel, which are near an outlet end, are respectively provided with a first water supply pipe; the exit of the fish collection channel is provided with a waterstop valve and a fish screen; two side walls of the fish collection channel are both provided with sliding rails arranged along the length direction of the fish collection channel; the two sliding rails are used for jointly supporting a fish herding screen by a driving mechanism; one side wall of the fish collection channel is inwards concave; the inwards-concave position is provided with observation equipment; the observation equipment is connected with a computer; the transshipment device comprises a fishlock, wherein a transshipment funnel is erected on the fishlock; the top end of the transshipment funnel on one side of the fishlock is connected with the exit of the fish collection channel; the top end of the transshipment funnel on the other side of the fishlock is connected with a second water supply pipe with a water supply valve; the hole of the transshipment funnel is provided with a fish discharging valve; the bottom of the funnel just faces to a vehicle access road through which the fish van passes.