30results about How to "Prevent reflux" patented technology

The invention discloses a self-lubricating harmonic reducer. The self-lubricating harmonic reducer comprises a wave generator, a rigid gear and a flexible gear, wherein the rigid gear is meshed with the flexible gear; the wave generator is in contact with the inner wall of the flexible gear; an oil seal is arranged on an input shaft of the wave generator or an output end of the reducer in a sealing manner; a lubricant cavity is formed among the oil sea, the wave generator and the flexible gear; the oil seal comprises a ring-shaped base part; an elastic lip edge overhangs outwards from the outer side wall of the base part; the elastic lip edge is slantly arranged toward the wave generator; the overhanging tail end of the elastic lip edge tightly presses against the inner wall of the flexible gear. According to the reducer disclosed in the invention, the lubricant cavity, rather than the whole cavity in the flexible gear, is filled with the lubricant, so that the weight of the lubricant is decreased; the lubricating supply for the rigid gear and the flexible gear can be completed, and the flowing direction of the lubricant is not influenced by the mounting direction of the harmonic reducer, so that the favorable lubrication for the rigid gear and the flexible gear is ensured, the torn-up scrap iron of the rigid gear and the flexible gear is prevented from flowing back to the flexible bearing along with the lubricant, and the service life of the reducer is prolonged.

A naso/orogastric device having backflow blocking means and comprises a naso/orogastric tube sized and shaped for being disposed within the esophagus so that at least a distal end thereof being placed in the stomach lumen of a patient, at least one elastic esophageal body, positioned along the naso/orogastric tube, having a pressure dependent volume, at least one esophageal sensor that detects fluid around at least one segment of the naso/orogastric tube, and a pressure regulator that regulates a pressure within the elastic esophageal body according to the detection.

The invention relates to a fuel cell system and a standby control method thereof. The fuel cell system comprises a fuel cell stack, an air compressor, a shunt device, a back pressure valve, a hydrogensupply and return assembly, a water diversion and hydrogen discharge assembly and a boost DC/DC converter; the fuel cell stack comprises an anode chamber and a cathode chamber, the fuel cell stack isconnected with the boost DC/DC converter, an outlet of the air compressor is in fluid connection with an inlet of the cathode chamber and an outlet of the back pressure valve, and an inlet of the back pressure valve is connected with an outlet of the cathode chamber; the anode chamber inlet and the anode chamber outlet of the fuel cell stack are respectively connected with the hydrogen supply andreturn assembly and the water diversion and hydrogen discharge assembly, and a hydrogen discharge outlet of the water diversion and hydrogen discharge assembly is connected with an inlet of the hydrogen supply and return assembly. The standby control method solves the problems that the normal shutdown process is long in elapsed time and the service life of the fuel cell stack is influenced.

The invention discloses a charge pump circuit. The charge pump circuit is prevented from generating reverse flow by using a rectifier element, which can prevent energy stored in the charge pump circuit from reversely flowing into an input voltage source or energy stored in a capacitor at the output end from reversely flowing to the charge pump circuit and an input voltage source. A current limit unit is connected with an input power supply or/and connected to the output end, the invention can also avoid the problem that the input power supply provides heavy current to the charge pump circuit or/and the charge pump circuit provides heavy current to the output end to cause the overburning of elements of the charge pump circuit when generating short circuit.

The invention belongs to the field of respiratory protection devices, and specifically discloses a disinfection mask. The disinfection mask comprises a face mask and a kill box; a one-way suction portand a one-way exhaust port are formed in the face mask; the one-way suction port and the one-way exhaust port have a one-way opening function; the one-way suction port is opened when a user inhales and closed when the user exhales; the one-way exhaust port is opened when the user exhales and closed when the user inhales; the kill box comprises a box body, a waste gas pipe and an exhaust pipe; thebox body is used to store a killing solution; the waste gas pipe is located inside the box body and is designed to prevent backflow; an inlet of the waste gas pipe is connected to the one-way exhaustport; and an outlet of the waste gas pipe is located in the killing solution; the waste gas pipe is used for sending gas exhaled by the user in the killing solution for disinfection; and the exhaustpipe is also arranged inside the box body, but is not in contact with the killing solution, and is used to discharge the disinfected gas in the box body. The disinfection mask can effectively disinfect the gas exhaled by the user to prevent the gas with pathogens from being directly discharged to the external space, thereby effectively blocking the spread of the pathogens.

The invention relates to an anti-backflow device for an abdomen excretion stoma. An anti-backflow inner bag with an elastic opening in the tail end is arranged in a collecting bag and divides the collecting bag into two spaces, one space is an upper cavity communicated with a center excretion opening, the other space is a lower cavity communicated with an excretion switch, and the upper cavity and the lower cavity are communicated through the elastic opening. As the anti-backflow mechanism is arranged in the stoma device, excrement in the collecting bag is prevented from flowing back to the maximum extent on the premise of ensuring normal excretion.

The invention provides a cleaning method and a cleaning liquid feeding deviece for carrying out the method. wherein the method prevents a film forming of a cleaning liquid on a material to be washed, and at the same time, enables also the prevention of the back flow of the cleaning liquid and foreign materials on the material to be washed. In the cleaning method which sprays the cleaning liquid continuously to the material to be washed, a high-pressure cleaning liquid is sprayed to the material to be washed continuously in a flow rate of 14-17 m/sec, and at the same time, the flow rate of the cleaning liquid sprayed continuously increases up to 100-120 m/sec in a cycle of 20-50 c/sec to add strength and weakness to the cleaning liquid. Accordingly, since the strength and weakness added to the cleaning liquid blows out the cleaning liquid sprayed to the material to be washed, no coating film of the cleaning liquid is formed on the material to be washed. Further, since the cleaning liquid is sprayed continuously to the material to be washed, it is possible to flow the cleaning liquid bumped against the material to be washed on the material to be washed always together with the removed foreign materials, and to prevent the back flow on the material to be washed.

The invention discloses a double-cylinder flow stabilizing delivery pump. The double-cylinder flow stabilizing delivery pump comprises a pumping hydraulic pump, a fast reverse hydraulic pump, a fast reverse hydraulic valve bank, a pumping hydraulic valve bank, a distribution valve bank, a pumping hydraulic cylinder A and a pumping hydraulic cylinder B. The pumping hydraulic cylinder A is connected with the pumping hydraulic cylinder B in parallel and communicates with the pumping hydraulic cylinder B. A communication cavity of the pumping hydraulic cylinders is connected with the fast reverse hydraulic valve bank. The fast reverse hydraulic valve bank is further connected with the fast reverse hydraulic pump and an oil return pipeline. The pumping hydraulic valve bank is connected with a non-communication cavity of the pumping hydraulic cylinder A, a non-communication cavity of the pumping hydraulic cylinder B, the pumping hydraulic pump and the oil return pipeline through an oil circuit. The reciprocating type double-cylinder delivery pump is stable in pressure and flow, high in volume efficiency, not prone to pipe blockage, small in pipeline vibration, safe, reliable and wide in applicable range. The invention further discloses a trailer pump and a pump truck adopting the double-cylinder flow stabilizing delivery pump.

An air inlet is formed in the inner side of a fixed supporting box, an isolation net plate is welded to the inner side of an air inlet limiting box, a cleaning sliding plate is connected to the bottom end of a lower piezoelectric push rod, air suction pipes are connected to one end of a suction box at equal intervals in a penetrating mode, and the air outlet ends of the air suction pipes are connected with the air inlet end of an air suction pump; an air pump sucks air in a workshop to the position of an isolation net plate through an air suction pipe and a suction box, impurities contained in the air are intercepted through the isolation net plate, and a lower piezoelectric push rod drives a cleaning sliding plate to scrape away the attached impurities, so that operation can be rapidly carried out when the air is primarily treated; and air enters the inner side of a discharge pipe through a suction box and an exhaust pipe and is finally discharged into the inner side of the fixed supporting box, so that the air stably enters the inner side of the fixed supporting box.

The invention relates to the technical field of sewage treatment, and discloses a green and environment-friendly activated carbon adsorption filtration sewage treatment device, which comprises a sewage sedimentation tank, a purification filter cartridge, a sedimentation tank separation mechanism and a sedimentation sewage discharge mechanism, and further comprises an activated carbon rotary adsorption filtration purification mechanism, the purification filter cartridge is arranged on one side of the sewage sedimentation tank, the sedimentation tank separation mechanism is arranged in an innercavity of the sewage sedimentation tank and on the other side of the sewage sedimentation tank, the sedimentation sewage discharge mechanism is arranged at the bottom of the sewage sedimentation tank,and the sewage sedimentation tank and the purification filter cartridge are both connected with the activated carbon rotary adsorption filtration purification mechanism. According to the sewage treatment device, large-particle impurities in sewage can be discharged, smooth and stable follow-up sewage filtering and purifying work is guaranteed, activated carbon adsorption, filtering and purifyingwork on the sewage is efficiently, conveniently and rapidly achieved, a continuous clean environment of the inner cavity of filtering equipment can be guaranteed, and the situation that the equipmentis corroded and damaged is avoided.

A thermal cycle temperature control system based on a thermoelectric refrigeration technology comprises a main control module, a temperature control circuit module, a temperature control execution module, a feedback module and a thermal cover module. The temperature control execution module is provided with a thermoelectric refrigerating unit and a sample groove, and the thermoelectric refrigerating unit is located below the sample groove for heating and refrigerating; the temperature control circuit module is connected with the temperature control execution module so as to drive the thermoelectric refrigerating unit, perform current commutation and control temperature rising and falling circulation; the heat cover module is arranged above the sample groove to prevent the sample from condensing and reflowing; the feedback module is connected with the temperature control execution module and the heat cover module so as to detect the temperature and convert a feedback signal into a voltage signal; and the main control module is connected with the feedback module and the temperature control circuit module so as to modulate a PWM control signal according to a PI control algorithm and current feedback so as to regulate and control the temperature control circuit module. According to the invention, high-power driving, rapid heating and cooling, wide-range temperature difference, high-efficiency operation and high-precision circulation of the thermoelectric refrigerating unit can be realized.

The invention provides a novel self-stop drip chamber with a negative pressure conduction device. Structural design is performed on the basis of characteristics of liquid and the principle of gravity, pressure and negative pressure so that the disposable venous infusion apparatus drip chamber and a combined device can have the automatic stopping function and the negative pressure conduction function, the phenomenon that because the height of the medicine liquid level of an infusion tube in venous infusion decreases, air inflow and backflow blood return happen is eradicated, and negative pressure support is provided for an external monitoring and guarding system. Compared with other stop devices, the novel self-stop drip chamber has the advantages of being simple in structure, complete in system, good in effect and high in manufacturability; labor intensity of medical workers can be effectively reduced in clinical application, a large number of manpower resources needed for observing the infusion progress are saved, infusion management can be more standard, more intimate nursing can be achieved, and meanwhile the novel self-stop drip chamber has great economical and social benefits.

The invention belongs to the technical field of medical treatment, and particularly relates to an intraspinal analgesia catheter implantation system for treating the intractable cancer pain. The implantation system comprises: a puncture needle sleeved with a sleeve; a guide wire which can arranged in the sleeve; a blood vessel sheath in which the guide wire can be arranged; an expansion tube which can be arranged in the blood vessel sheath and in which the guide wire is arranged; and a PICC tube which can be arranged in the blood vessel sheath; The intraspinal analgesia catheter implantation system adopts high-grade medical silica gel, has excellent biocompatibility, is suitable for medium and long term indwelling, adopts a three-way valve design, prevents cerebrospinal fluid backflow, reduces the vessel blocking rate, and greatly reduces the economic burden of patients; according to the invention, the intrathecal analgesia has the advantages of exact analgesic effect, rapid response, small side effect, and small dosage of an analgesic drug, which is only 1/300 of the oral dosage. The method is convenient and rapid to operate, definite in curative effect and small in adverse reaction, greatly relieves the economic burden of patients, and is suitable to apply to advanced cancer pain patients.

Disclosed are various embodiments for an anti-reflux enema bag having a pulley restrictor that acts as a waterflow restrictor, where the enema bag is leakproof, easy-to-clean, and provides a steady flow of solution. An enema bag system includes an enema bag, a nozzle comprising a nozzle outlet, and an anti-reflux coupler positioned between the enema bag and the nozzle through which the solution passes from the enema bag to the nozzle outlet. The anti-reflux coupler comprises an inlet for receiving at least a portion of the solution from the enema bag; an outlet for expelling the solution into the nozzle; and a check valve configured to prevent reflux of the solution from the nozzle. The enema bag system further comprises a pulley restrictor configured to selectively control a speed at which the solution is introduced into the nozzle and expelled from the nozzle outlet.

The invention discloses a stomach tube capable of measuring pressure and preventing backflow. The stomach tube comprises a tube body, a plastic tail end, a head end sleeve seat, an internal thread, a silica gel connecting belt, a first sealing washer, a threaded column, a holding head, a guide wire, a first air tube, a first air bag, a second air tube, a second air bag, an exhaust port, a sealing cover, a one-way valve, a filter cotton layer, a first sleeve bag, a second sleeve bag, a control box, a cable, a rotary connecting body, an embedded groove, a rotary head, a medicine discharging hole, a pressure sensor, a sealing ball head, a second sealing gasket, a connecting guide rod, a sealing cover strip, a communicating hole, a spring arc piece, an iron disc, a guide ring, a connecting strip, a guide hole, a first spiral spring, a first electromagnet, a nesting base, an embedding hole, a second spiral spring, a sealing plate, an inner blocking hole, a sealing embedding block, a third spiral spring, a limiting groove, a trapezoidal block, a second electromagnet, an iron sheet, a hinge shaft and a spring wire. The stomach tube has the beneficial effects that the medicine discharging hole and the medicine outlet can be self-sealed, automatic blocking can be carried out, and backflow is prevented.

The invention provides a female underpants type urine collector, and relates to the technical field of medical instruments, the urine collector comprises an underpants body, the surface of the underpants body is provided with a through hole matched with the position of the perineum, and the inner side of the underpants body is provided with an adhesive layer used for tightly attaching the perineum around the opening end of the through hole. An opening of the through hole extends outwards to form an anti-backflow part for urine to pass through, the anti-backflow part is used for preventing urine from flowing back, the anti-backflow part is sleeved with a liquid collecting component, one end of the liquid collecting component is connected with the pants body, the other end of the liquid collecting component is connected with a storage bag, and the liquid collecting component is used for guiding the urine flowing out of the anti-backflow part into the storage bag; the anti-backflow part is sleeved with the liquid collecting part, during urination, urine flows into the liquid collecting part through the anti-backflow part and then flows into the storage bag through the flow guide pipe, an outlet of the anti-backflow part is obliquely and downwards formed, urine backflow is avoided, during replacement, the pants body, the double-face nanometer silica gel paste and the liquid collecting part or the storage bag can be independently replaced, and the pants body and the liquid collecting part can be disinfected and repeatedly used.

The invention provides a check valve, and relates to the technical field of valves. The check valve comprises a valve body and a valve element mechanism, wherein the valve body is provided with an inlet end, a connecting channel and an outlet end which are sequentially connected; the valve element mechanism comprises a flow limiting plate, a sealing assembly, a connecting sleeve, a movable rod, a supporting plate, rotating shafts and blades; the flow limiting plate is fixed in the connecting channel; a flow limiting hole is formed in the middle of the flow limiting plate; the sealing assembly is arranged on one side of the flow limiting plate; the connecting sleeve is installed on one side of the sealing assembly, and connected with the movable rod in an insertion mode; the supporting plate is fixed in the connecting channel; fluid can flow through the supporting plate; one end of the movable rod is connected with the supporting plate in an insertion mode; flow guide channels are formed in the side walls of the valve body; and the blades are installed in the flow guide channels through the rotating shafts, and are in transmission connection with the movable rod. When the fluid flows reversely, the situation that the fluid flows reversely can be better avoided through the sealing assembly; and when the fluid flows in the forward direction, the blades are prevented from rotating under the action of the fluid all the time, so that energy consumption is reduced.

The invention discloses a clothes dryer, belongs to the field of household appliances, and can prevent condensed water from spilling out of a water storage box. The clothes dryer comprises a drying chamber for storing clothes, a heating means for heating air, an air supply means for conveying the heated air to the drying chamber, a dehumidifying means used for dehumidifying wet warm air after the wet warm air passes through the drying chamber, and a water storage box which is installed in the clothes dryer in a drawable mode and collects water generated by the dehumidifying means, wherein the water storage box is provided with an opening part which is opened from top to bottom and enables the water to enter the water storage box; and the opening part is provided with a check valve which can allow water dehumidified from top to bottom to pass through and prevent the water in the water storage box below from flowing back.

The invention discloses ex-situ thermal desorption equipment for repairing organic contaminated soil, the ex-situ thermal desorption equipment comprises a box body, a heating box, a first motor and a treatment box, the heating box is mounted on the inner top wall of the box body, a detector is mounted on the inner wall of the heating box, the treatment box is mounted on the inner wall of the box body, and an air inlet pipe is mounted at the bottom of the treatment box in a penetrating manner; and one end of the air inlet pipe extends into the heating box, a second motor is installed on the inner bottom wall of the box body, and an electric telescopic rod is installed on the inner wall of the heating box. According to the device, the material turning device is installed, so that material turning can be conducted, heating is uniform, a first motor rotates to drive a first bevel gear to rotate, a second bevel gear rotates to drive a fixing shaft to rotate, the fixing shaft rotates to drive a fixing ring to rotate, and the fixing ring rotates to drive a supporting rod and a material turning groove to rotate; and the soil enters the material turning groove, the soil in the material turning groove falls into the heating box, and the material turning function is achieved.