13results about How to "Prevent reverse flow" patented technology

The utility model discloses a multi-fermentation tank tail gas parallel exhaust system based on air pressure adaptive switching, which comprises a DCS (Distributed Control System) controller and a plurality of fermentation tanks, the upper end of each fermentation tank is provided with a pressure gauge and an exhaust pipe, the exhaust pipe is connected with a first exhaust branch pipe and a second exhaust branch pipe, the first exhaust branch pipe is connected with a tail gas exhaust header pipe, and the second exhaust branch pipe is connected with the tail gas exhaust header pipe. The first discharge branch pipe is connected with the high-pressure steam discharge header pipe, the second discharge branch pipe is connected with the high-pressure steam discharge header pipe, a first manual valve and a first automatic valve are arranged on the first discharge branch pipe, a second manual valve, a proportional electromagnetic valve and a second automatic valve are arranged on the second discharge branch pipe, and the DCS controller is connected with the pressure gauge, the first automatic valve, the proportional electromagnetic valve and the second automatic valve. The first discharge branch pipe is used for discharging micro-positive pressure gas; and the second discharge branch pipe is used for discharging steam. The DCS controller automatically switches the first automatic valve and the second automatic valve according to the pressure value detected by the pressure gauge, parallel discharge of micro-positive pressure gas and steam is achieved, and the pressure fluctuation range is smaller than or equal to + / -5%.

This invention relates to the field of casting technology, specifically to a water-cooled desanding device for casting air conditioning compressor cylinders. The device includes a water-cooled desanding box, which is internally divided into upper and lower chambers. A coarse desanding mechanism is located in the lower chamber, and a fine desanding mechanism is located in the upper chamber. The fine desanding mechanism includes a desanding hood, a filter screen, a rotary drive mechanism, and a lifting mechanism. The desanding hood has an open opening at its upper end and is a rotating body around its own axis. The filter screen is located on the side wall of the desanding hood and is used to filter water entering the desanding hood. The rotary drive mechanism drives the desanding hood to rotate around its own axis. The lifting mechanism drives the desanding hood to move up and down along its axial direction. This invention, by incorporating the desanding hood, filter screen, rotary drive mechanism, and lifting mechanism, solves the problem of residual sand particles after traditional coarse desanding.

The invention discloses an anti-exosmosis chemotherapy dosing device for medical oncology, which belongs to the technical field of tumor chemotherapy and comprises a moving rod, a support rod is fixedly mounted at the top end of the moving rod, a dosing bottle is arranged on one side of the support rod, and an infusion mechanism forming a gas-liquid pressure self-balancing system is arranged at the bottom end of the dosing bottle. The infusion mechanism comprises an injection head inserted into a bottle opening of the medicine feeding bottle, a first connecting block is arranged on the injection head, and an infusion tube is installed at the free end of the injection head in a communicating mode. Meanwhile, redundant liquid can be rapidly shunted and reflowed through the backflow pipe, the backflow pressure peak value can be effectively absorbed through a buffering bag supported by a honeycomb support in the flow slowing cavity, vortex can be avoided through a built-in flow guiding component and a flexible silica gel miniature flow limiting valve, and the problem of damage caused by too high pipeline pressure is solved to the maximum extent.

The utility model discloses a polyester draw texturing yarn heating device of a draw texturing machine. The polyester draw texturing yarn heating device comprises a support, a containing groove is formed in the side wall of one side of the support, a containing hole is formed in the side wall of the containing groove, the inner side wall of the containing hole is connected with a fan, and one end of the containing hole is connected with a closed pipe. The polyester draw texturing yarn is placed on the auxiliary mechanism and the heating mechanism, the auxiliary mechanism is used for limiting the up-down moving amplitude of the polyester draw texturing yarn, the fan and the electric heating wire are started, hot air flows to the air supply mechanism from the closed pipe and then flows into the heating mechanism to heat the polyester draw texturing yarn, and the polyester draw texturing yarn is heated through the closed space of the heating mechanism. And the heating area of the polyester textured yarn is reduced, so that the waste of heat is reduced, floating dust on the surface of the polyester textured yarn can be blown down by flowing hot air, and the cleaning effect on the polyester textured yarn is achieved.

The present application relates to the technical field of turbo molecular pump, in particular to a kind of turbo molecular pump blade, turbo rotor and turbo molecular pump.Turbo molecular pump blade, the pressure surface and suction surface of blade body are both curved surface, the thickness of the blade body gradually decreases from root to top, the blade thickness of the blade body root is 3.5mm-4.5mm, the blade thickness of the blade body top is 1.5mm-2.5mm, the inlet angle of the blade body is 25°-35°, the outlet angle of the blade body is 40°-50°, the blade inclination of the blade body is 0°-20°.Design as smaller inlet angle and larger outlet angle, can improve the ability of capture, discharge and reverse to prevent backflow to the gas pumping capacity.In the case where other parameters are the same, it can improve the pumping speed and compression ratio of turbo molecular pump, can greatly improve the pumping capacity of turbo molecular pump under low pressure working condition.

The present application relates to the technical field of sewage multi-stage treatment, and discloses a multi-stage industrial sewage treatment device and a multi-stage sewage treatment process based on electric demulsification. The present application can separate the scum, sediment and sewage in the industrial sewage through a primary sedimentation process in the primary treatment cavity, then input the sewage into the secondary treatment cavity, further mix the sewage in the mixing chamber to form emulsion, and then overflow the emulsion above the liquid outlet from the liquid outlet to the through treatment chamber, and exchange with the liquid in the electric demulsification chamber. In the electric demulsification chamber, the emulsion is broken under the action of the electric field to produce flocculation and stratification, and the emulsion flocculation stratification produces flocculation scum, flocculation supernatant and flocculation sediment. Then, the scum and sediment in the industrial sewage, and the flocculation scum and flocculation sediment are effectively removed, thereby ensuring the treatment effect of the industrial sewage.

The utility model discloses a photovoltaic bypass protection module and junction box assembly, which comprises N groups of first electronic devices with bypass protection function and unilateral conductivity, N is greater than or equal to 1, the N groups of first electronic devices are mutually connected in series, and the first electronic devices are configured to be used for being connected in series and parallel with solar cells. The second electronic device has an anti-reflux function, the second electronic device is connected with the N groups of first electronic devices in series, and a first electrode of the second electronic device is configured to be electrically connected with a second electrode of a series circuit formed by the N groups of first electronic devices; one end of the electric conductor is electrically connected with the first electrode of the second electronic device, the other end of the electric conductor is used for being electrically connected with an external detection power source, and by arranging the electric conductor in the structure, EL testing of the junction box can be achieved under the condition that the junction box does not need to be disassembled.

The utility model discloses a kind of elastic block telescopic clamping position filter core mechanisms, including cylinder shell, cylinder shell one end is provided with mounting base plate, mounting base plate upper surface is provided with elastic block mechanism, elastic block mechanism includes two sliding blocks, sliding block is slidably arranged on mounting base plate, decorative gland is provided above elastic block mechanism, rotating seat is provided on decorative gland, decorative gland upper surface is provided with the split synthesis of breakage buckle plate, rotating block is provided on breakage buckle plate lower surface, shaft is provided on the both sides of rotating block, shaft is inserted on rotating seat, shell other end is inserted with spin fusion cover. The utility model integrates the independent spin fusion structure cover of fixed elastic block mechanism and cylinder shell as a whole by setting mounting base plate, reduces the number of parts, improves production efficiency, decorative gland and breakage buckle plate are assembled into elastic mechanism with elastic block mechanism, the assembly between each component is more convenient by this integrated design, further improves production efficiency, and it is also convenient to use and maintain.

This invention discloses a rapid human interleukin-4 test strip based on a double-antibody sandwich method. The test strip includes a sample pad, a latex pad, a conjugate pad, a nitrocellulose membrane, and an absorbent pad. The latex pad is made of latex microspheres labeled with CKIgY monoclonal antibody and red polystyrene latex microspheres. The conjugate pad is made of latex microspheres labeled with IL-mouse monoclonal antibody and red polystyrene latex microspheres. A detection line and a control line are located in the center of the nitrocellulose membrane. The detection line contains a protein conjugate for binding with the IL-mouse monoclonal antibody, and the control line contains an IgG monoclonal antibody. An upper shell is located on the outside of the test strip, and a matching lower shell is provided. This invention provides a rapid human interleukin-4 test strip based on a double-antibody sandwich method. This test strip has high sensitivity, low risk of cross-reaction, simple operation, and low cost.

The utility model discloses a fixed pollution source waste gas sampling port sealing device, including waste gas sampling gun, the fixed connection of the outer wall of the sampling pipe department of waste gas sampling gun has the threaded sleeve pole, the outer wall of threaded sleeve pole has seted up the thread, the outer wall threaded connection of threaded sleeve pole has the threaded sleeve piece, and the one side of inflatable ring is attached with the annular protruding department of threaded sleeve piece, the other side of inflatable ring is provided with the trachea, and the inner bag of trachea and inflatable ring are linked together. The device is applied to the sampling link of waste gas sampling gun, when the barrel department of waste gas sampling gun is inserted into the fixed pollution source pipeline, through the trachea of inflatable equipment connection inflatable ring one end, the input air of it makes it expand, seals the pipeline mouth, avoids the outside air and will flow into the pipeline through the gap reversely, improves the sealing effect is strong, avoids and will cause the discharge concentration calculation because of oxygen content conversion error, makes the actual emission of pollutant be underestimated, ensures the real and reliable of waste gas sampling data.

The application provides an anti-leakage oil-immersed transformer sealing structure and relates to the technical field of power transformer sealing protection. The anti-leakage oil-immersed transformer sealing structure comprises an oil-immersed transformer, a communication port is formed in the top of the oil-immersed transformer, a pressure stabilizing mechanism is arranged on the top of the oil-immersed transformer, the pressure stabilizing mechanism comprises a triggering assembly and a volume expansion assembly, the triggering assembly is used for conveying pressure gas and starting the volume expansion assembly when the internal pressure of the transformer exceeds the standard, a support frame is fixedly installed on the top of the oil-immersed transformer, the volume expansion assembly is installed on the top of the support frame, and the volume expansion assembly is used for expanding the internal volume of a cavity and stabilizing the excessively high internal pressure of the transformer. The anti-leakage oil-immersed transformer sealing structure has the advantages of step-by-step pressure buffering, volume expansion and automatic multi-cavity pressure equalization.

The utility model discloses a fire extinguishing spray head of a battery pack, which belongs to the technical field of new energy battery pack protection and comprises a body, one end of the body is rotatably connected with a bent pipe, one end of the bent pipe far away from the body is provided with a spray head, a nozzle opening of the spray head and a runner hole of the body are arranged in a non-concentric manner, and a rotational flow piece is arranged between the spray head and the bent pipe. And a valve core is arranged between the bent pipe and the body. Due to the adoption of the elbow design that the nozzle opening position of the spray head is not concentric with the runner hole of the body, the variability of the nozzle opening position is realized, so that sheltering objects are avoided, the fire extinguishing spraying range is expanded, and the fire extinguishing capacity is improved.

The utility model belongs to the technical field of filter cartridge dust removal equipment, and particularly discloses anti-static filter cartridge pulse type filter cartridge dust removal equipment which comprises a shell and a pulse valve, the pulse valve is installed at the upper left corner of the exterior of the shell, and an air spraying pipe is transversely fixed to the left side of the upper portion in the shell. A supporting plate is fixed between the two sides of the top end in the shell, a vertical groove is formed in the supporting plate, and a filter cylinder is fixedly inserted into the vertical groove. According to the pulse type filter cartridge dust removal equipment for the anti-static filter cartridge, a vertical groove is formed in a supporting plate, an upper cover of a shell is opened, the filter cartridge is vertically inserted into the vertical groove of the supporting plate, a clamping ring at the top end of the filter cartridge can prevent the filter cartridge from being separated from the supporting plate, and the filter cartridge is attached to limiting rods on the two sides of the outside during lifting; after the circular ring at the bottom of the filter cartridge is embedded between the clamping block and the limiting rod, the filter cartridge is continuously pressed downwards until the clamping block is embedded into the clamping groove, the position of the filter cartridge is limited, and the problem that the filter cartridge is easy to shake is solved.