12results about How to "Reduce back flow" patented technology

The embodiment of the present application provides a crystallization promoting body, a preparation method thereof and a wastewater treatment device. The crystallization promoting body is used for removing target ions in wastewater. The crystallization promoting body comprises: a carrier sheet, the density of the carrier sheet is less than the density of the wastewater; and crystal seeds, the crystal seeds are arranged on the surface of the carrier sheet and used for promoting the target ions to form crystals. The crystallization promoting body can reduce the energy consumption of the wastewater treatment device.

The invention discloses a piezoelectric fluid driving pump performance test analysis method based on solid-liquid coupling, and relates to the field of piezoelectric fluid driving pumps. Main factors influencing vibration characteristics and flow output characteristics of the piezoelectric fluid drive pump are analyzed, the influence rule of the main factors of an electromechanical hydraulic system on the performance of the piezoelectric fluid drive pump and a reasonable system parameter matching relation are obtained, key structure parameters restricting the output performance of the piezoelectric fluid drive pump are extracted, and a three-dimensional model of the piezoelectric fluid drive pump is constructed; the specific flowing condition and the pressure loss condition of a liquid medium in a pump cavity are obtained, key structure parameters and a nonlinear coupling rule between fluids are analyzed, the optimal matching relation between the structure and the parameters of the piezoelectric fluid driving pump system is sought, and a test platform of the output performance is constructed. And performing an experimental test on the test platform by utilizing a control variable method, and acquiring an influence relationship between each key structure parameter and the output performance under the driving voltage and the driving frequency according to experimental test data.

A PK polymerization solvent recovery system comprises a dehydrating tower, a heavy component removing tower and a solvent rectifying tower, an inlet is formed in the middle of the side wall of the dehydrating tower and connected with a crude solvent source, a tower top discharge port of the dehydrating tower flows back to the top of the dehydrating tower through a dehydrating tower condenser and a dehydrating tower return tank to discharge process water, and a bottom discharge port of the dehydrating tower supplies materials to the heavy component removing tower. A tower top discharge port of the heavy component removal tower is refluxed to the top of the heavy component removal tower through a heavy component removal tower condenser and a heavy component removal tower return tank, materials are supplied to the solvent rectifying tower, a tower top discharge port of the solvent rectifying tower is refluxed to the top of the solvent rectifying tower through a solvent rectifying tower condenser and a solvent rectifying tower return tank, and light components are discharged. And a tower bottom discharge port of the solvent rectifying tower is used for discharging the solvent. The device is simple in structure and convenient to operate, the solvent N-methyl pyrrolidone in the crude solvent and the residual catalyst palladium element can be effectively recycled, and the PK production cost is effectively reduced.

The utility model belongs to the technical field of domestic water, and particularly relates to a diaphragm type balance valve core for a pipe-in-pipe and a balance valve. The balance valve is provided with a balance valve element and comprises a balance valve frame, a balance valve element and a balance valve element, the valve core seat is mounted on the balance valve frame; the diaphragm component is installed on the valve element seat or in the balance valve frame, and a balance channel is arranged between the valve element seat and the diaphragm component or between the balance valve frame and the diaphragm component; the diaphragm component can deform and change the sectional area of the balance channel according to the pressure of the first channel. The medium pressure is large, the deformation amount of the diaphragm component is large, and the backflow amount of the balance channel is small, so that the backflow amount of the branch away from the circulating pump is larger than or equal to the backflow amount of the branch close to the circulating pump, the effect that the backflow amount is small and large is achieved, and the circulating efficiency and the water quality of the branch at the far end are guaranteed.

The atomization assembly comprises an atomization main body and a heating piece, the atomization main body is provided with an atomization channel and an air inlet channel, the atomization main body comprises a first barrel and a second barrel which are arranged in the radial direction of the atomization channel, the air inlet channel is located between the first barrel and the second barrel, the first barrel is provided with a first partition plate, and the second barrel is provided with a second partition plate; a first channel is formed between the first partition plate and the second barrel, the second barrel is provided with a second partition plate, a second channel is formed between the second partition plate and the first barrel, the first channel is communicated with the second channel, and the first channel and the second channel are arranged in a staggered mode in the radial direction and / or the circumferential direction of the atomization channel. When the backflow aerosol passes through the air inlet channel, baffling in the radial direction and / or the circumferential direction can be generated under blocking of the first partition plate and the second partition plate, so that the backflow rate and the backflow amount of the aerosol can be reduced, and the influence on the use experience of a user due to the fact that the aerosol is subjected to backflow condensation and gathered in the air inlet channel or the air inlet is reduced.

The utility model provides a horizontal slurry pump impeller and front guard plate gap adjustable structure, which belongs to the technical field of horizontal slurry pumps, and comprises an impeller body and a front guard plate body, a processing boss is arranged on the inner ring of the front side surface of a front cover plate, a first processing plane is arranged on the front side surface of the processing boss, and an assembly ring plate is arranged on the front side surface of the front cover plate. A second machining plane is arranged on the front side face of the assembling annular plate, the first machining plane and the second machining plane form a first matching plane, an annular groove is formed in the rear side face of the front protection plate body, an annular adjusting plate is arranged in the annular groove, and an adjusting assembly is arranged on the front protection plate body and corresponds to the annular groove. According to the adjustable structure for the gap between the impeller and the front protective plate of the horizontal slurry pump, the gap between the annular adjusting plate and the first matching plane is adjusted through the adjusting assembly, and after the impeller is assembled, the gap between the impeller and the front protective plate can be reduced as much as possible, the backflow amount of slurry is reduced, and the efficiency of the pump is improved.

A separation and recovery device for thiophene-containing BT oil includes a BT oil thiophene removal system, a first distillation column, and a second distillation column. The inlet of the BT oil thiophene removal system is connected to a BT oil source, and the outlet is fed to the first distillation column via a first pipeline. The outlet of the condenser at the top of the first distillation column forms a first benzene outlet, and a first reflux pipeline is provided connected to the reflux port of the first distillation column. The bottom of the first distillation column is fed to the second distillation column via a second pipeline. The top of the second distillation column is connected to the inlet of the reboiler heat exchange medium channel at the bottom of the first distillation column via a third pipeline. The outlet of the reboiler heat exchange medium channel at the bottom of the first distillation column forms a second benzene outlet, and a second reflux pipeline is provided connected to the reflux port of the second distillation column. This invention has a simple structure, is easy to operate, and can effectively separate and recover benzene and toluene from BT oil with high purity. It also effectively reduces the heat load of separating benzene and toluene, and can handle high-concentration thiophene petroleum benzene.

The application discloses an air conditioner indoor unit, and belongs to the technical field of air conditioners. The air conditioner indoor unit comprises a shell, an impeller, a heat exchanger, a volute and a volute tongue. The volute tongue and the shell form an air inlet air duct, and the volute and the volute tongue form an impeller mounting cavity and an air outlet air duct. The impeller is arranged at the impeller mounting cavity, and the impeller is used for driving airflow to sequentially pass through the air inlet air duct and the impeller mounting cavity to form outlet airflow. The outlet airflow comprises backflow airflow which flows back to the impeller after being divided at the volute tongue, and air outlet airflow which flows to the air outlet air duct. The air outlet airflow exchanges heat with the heat exchanger. A gap between a volute tongue windward surface of the volute tongue and the impeller forms a gap flow channel. A flow guide channel is arranged at the volute tongue, and the flow guide channel is used for guiding a part of the backflow airflow to the gap flow channel. The air conditioner indoor unit can improve the pressure resistance of the cross-flow fan.

The invention discloses a method for separating n-butane and alkylate oil by a low-temperature rectification process, which comprises the following steps: step S1, distillation: sending an isobutane tower bottom material as a raw material to an n-butane tower for rectification, and adopting 1.6 MPa steam as a heat source at the tower bottom; step S2, separation: condensing a gas phase at the top of the n-butane tower through a condenser of the n-butane tower, and feeding the condensed gas phase into a reflux tank of the n-butane tower; step S3, condensation: pressurizing an n-butane tower reflux tank to 0.85 MPa through an n-butane tower reflux pump, then quantitatively refluxing part of the n-butane tower reflux tank, cooling part of the n-butane tower reflux tank to 40 DEG C through an n-butane cooler, then conveying the part of the n-butane tower reflux tank to a tank area, and collecting n-butane; and S4, refining: pressurizing the n-butane tower bottom material to 0.8 MPa through a product conveying pump, cooling to 40 DEG C through a cooler, conveying to a tank area, and collecting to obtain alkylated oil. According to the invention, high-purity n-butane and alkylated oil can be efficiently and continuously separated; and rectification is carried out under low-pressure and low-temperature conditions, so that the boiling point of isooctane is not reached, and n-butane with a very low boiling point can be separated out.

The invention discloses a sewage treatment system and method for nitrogen and phosphorus removal through denitrification coupling of an external carbon source and an internal carbon source. The sewage treatment system comprises a sewage inlet pipe channel I, a biochemical pool, a secondary sedimentation tank, an outer return pipe channel and an inner return pipe channel, the biochemical pool comprises an anaerobic zone, an anoxic zone I, an aerobic zone, an anoxic zone II and an aerobic-anoxic switching zone which are communicated in sequence, the sewage inlet pipe channel I is communicated with the anaerobic zone, and the secondary sedimentation tank is communicated with the aerobic zone; a sludge pipe at the bottom of the secondary sedimentation tank is communicated with the anaerobic zone through an outer return pipe channel, and the aerobic zone is communicated with the anoxic zone I through an inner return pipe channel. When the sewage treatment system is used for sewage treatment, the internal carbon source and the external carbon source are coupled, so that the carbon source in the domestic sewage can be fully utilized in situ, the removal degree and the removal rate of total nitrogen of a biochemical system are improved, the reflux quantity of sludge is remarkably reduced, and the sewage treatment efficiency is improved under the condition that no extra cost is increased. And the effluent quality is improved.

A centrifugal fan comprises a machine shell, an impeller arranged in the machine shell, an air inlet pipe arranged on the machine shell and a front cover plate inserted in the impeller, and the center of a rear cover of the impeller is fixedly connected to a main shaft of a motor, and is characterized in that a plurality of radial ribs are arranged on the right side face of the rear cover plate, and a bearing seat is arranged in the air inlet pipe; a plurality of rib plates are symmetrically connected between the bearing seat and the air inlet pipe, a bearing is installed in the bearing seat, and the front end of the main shaft is connected in the bearing. The utility model has the beneficial effects that the ribs generate reverse centrifugal force when rotating to prevent gas in a high-pressure area from flowing towards the main shaft along the rear cover plate; the front end of the main shaft is connected in the bearing, so that the impeller can be prevented from shaking during rotation, a gap between a front cover plate of the impeller and a shell can be reduced, gas in a high-pressure area is prevented from converging to an inlet of the impeller, and non-contact sealing is realized; therefore, the problem that in the prior art, a sealing element needs to be replaced frequently due to abrasion is solved. Meanwhile, no friction force exists when the main shaft rotates, and mechanical loss of the fan can be reduced.

The utility model provides projection equipment, and relates to the technical field of projection. The vapor chamber is in thermal conduction with the heating element; the vapor chamber comprises a shell, the interior of the shell is provided with a cavity, and in the extending direction of the cavity, one end of the shell is a condensation end, and the other end of the shell is an evaporation end; the liquid absorbing core is located in the cavity and covers at least part of the cavity wall of the cavity; the liquid absorption core is used for transmitting liquid in the cavity, so that part of the liquid flows back to the evaporation end from the condensation end; the backflow piece is located in the cavity, one end of the backflow piece abuts against the liquid absorption core located at the condensation end, and the other end of the backflow piece abuts against the liquid absorption core located at the evaporation end; the backflow piece is used for conveying the liquid in the cavity so that the other part of the liquid can flow back to the evaporation end from the condensation end. According to the projection equipment, the backflow rate of liquid can be increased, and the heat conduction efficiency of the vapor chamber is improved.