110results about How to "Stable negative pressure" patented technology

The invention relates to a small scale micro sound wall climbing robot based on vacuum absorption principle, comprising the vacuum generator installed on the displacement structure, and the sucker on the displacement structure, the said vacuum generator composed of drive generator single post plug pump and the film pump connected with it, and the two position three way valve. The said displacement structure is six leg walking structure, with each leg's drive joint made of the generator, harmonic decelerator installed at both ends of the generator and the planetary reducer connected to it and they are forming into a module with the umbrella gear connected to the planetary reducer, with both ends of the module linked with the passive pole through the joint with the machine, the sucker installed on the passive pole through the passive joint and connected to the two position three way valves. It is small in size, low in noise, free from cables. It has extensive applications.

An image forming apparatus includes a recording head, a liquid tank, a first fluid flow path supplying liquid to the recording head, a second fluid flow path being in communication with the liquid tank, a pressure adjusting valve allowing fluid communication between the first and the second fluid flow paths, a cap member covering a nozzle surface of the recording head, and a suction unit being in communication with the cap member. The pressure adjusting valve includes a movable member movably disposed in the internal fluid flow path, wherein the movable member includes a sealing unit that seals the communication between the first and the second fluid flow paths when the cap member covers the nozzle surface of the recording head and a negative pressure is generated in a cap-member space formed between the cap member and the nozzle surface by driving the suction unit.

An ink tank is provided which can apply an optimum negative pressure stably by a valve of a simple structure. To this end, the ink tank of this invention has a valve and a damper section installed in an ink flow path. The valve deforms when the negative pressure in the ink supply port is greater than a predetermined level, to temporarily open the ink flow path to introduce ink from the ink accommodation portion to the ink supply port. The damper section is installed between and communicates to the ink supply port and the valve in the ink flow path. The damper section is formed of a resilient member more easily deformed than the valve and applies a negative pressure to the interior of the ink supply port by an elastic recovery force of the resilient member.

The invention relates to a component for an agricultural seeding machine, in particular to an air-aspiration type precise seed taking device which can be used for a precise seeding machine. The air-aspiration type precise seed taking device mainly comprises a negative pressure cavity (1), a seed sucking disc (3) and an installation shaft (4), wherein the seed sucking disc (3) is fixedly connected to the end part of the negative pressure cavity (1); the installation shaft (4) is connected with the negative pressure cavity (1) through a bearing (6); an air stopping block is arranged in the negative pressure cavity (1); the air stopping block is connected with the installation shaft (4) and is in sliding or rolling fit with the seed sucking disc (3); and the contact area between the air stopping block and the seed sucking disc at least covers one seed sucking hole (2). The invention has the advantages that: the overall structural design is scientific, the transmission is stable, and the rotation of the negative pressure cavity is combined with the air stopping of a sliding block to realize precise seeding; the air tightness of the negative pressure cavity is good, thus the negative pressure is more stabilized, the seed taking rate is improved, and the hole rate is reduced; the service life of the seed sucking disc is prolonged, and the power consumption is reduced; and the negative pressure seal is airtight and reliable, and the service performance is stable, thus the precise seed taking quality and stability are further improved.

A negative pressure ink supply system includes (1) a primary ink cartridges, (2) a secondary ink cartridges, which are connected by means of an ink tubes with the negative pressure ink cartridge assemblies provided between the secondary ink cartridges and the jet head. The ink, pumped from the primary ink cartridge, is put into the secondary ink cartridge, wherein it is supplied to the negative pressure ink cartridge and then in turn from the negative pressure ink cartridge to the jet head. The liquid level in the secondary cartridge is lower than the jet head surface and adjustable. The negative pressure ink supply system is suitable for image-printing equipment by supplying liquid ink, such as large format machines, portrait machines, plotters, etc.

A liquid dispenser is provided which dispenses a predetermined amount of a liquid from a reservoir. It includes a negative pressure system to supply a negative pressure which acts on the liquid in the liquid reservoir while no liquid is being dispensed. The negative pressure system includes a negative pressure source, an electropneumatic regulator communicating with the negative pressure source to regulate the pressure inside the liquid reservoir to a desired negative pressure level, a pressure sensor provided between the electropneumatic regulator and reservoir, and a control means for controlling the electropneumatic regulator responsive to a signal from the pressure sensor to regulate the pressure inside the reservoir to the desired negative pressure level. It can assure a negative pressure which is stable even just after it is switched on and can thus work stably even right after the switch-on.

A liquid dispenser is provided which dispenses a predetermined amount of a liquid from a reservoir. It includes a negative pressure system to supply a negative pressure which acts on the liquid in the liquid reservoir while no liquid is being dispensed. The negative pressure system includes a negative pressure source, an electropneumatic regulator communicating with the negative pressure source to regulate the pressure inside the liquid reservoir to a desired negative pressure level, a pressure sensor provided between the electropneumatic regulator and reservoir, and a control means for controlling the electropneumatic regulator responsive to a signal from the pressure sensor to regulate the pressure inside the reservoir to the desired negative pressure level. It can assure a negative pressure which is stable even just after it is switched on and can thus work stably even right after the switch-on.

A valveless micro pump sucker driven by a laminated radiation type mixed-connected compliance structure comprises a laminated type mixed-connected compliance amplifying mechanism, stacked piezoelectric ceramic sheets and a thin-film micro pump. The amplifying mechanism converts the radial input displacement to axial output displacement, namely structurally bonding and assembling a plurality of radiation type parallelly-connected compliance amplifying mechanism sheets with the same shapes after the radiation type parallelly-connected compliance amplifying mechanism sheets are connected in series, stacked and aligned vertically according to the output movement features; the stacked piezoelectric ceramic sheets are fixed to the amplifying mechanism, and high-frequency radial deforming displacement input is performed on the amplifying mechanism after powering on; the thin-film micro pump is adhered to the lower portion of the amplifying mechanism, and the bottom is provided with a sink groove type adsorption cavity used for absorbing the wall; the amplifying mechanism converts the high-frequency radial deforming displacement input by the stacked piezoelectric ceramic sheets to axial output displacement and drives the thin-film micro pump to operate, and the gas in the absorption cavity flow in an orientated manner to produce stable negative pressure. The valveless micro pump sucker is small in size, light, low in gravity center, free of noise and stable in high-frequency dynamic characteristics and is adaptive to serving as an absorption device of a wall climbing robot.

The invention discloses a four-roller oversized drafting compact spinning device which comprises a back drafting roller pair, a front drafting roller pair, a middle / back / front drafting roller pair and a middle drafting roller pair, wherein the back drafting roller pair consists of a back roller and a back leather roller, the front drafting roller pair consists of a narrow groove type negative pressure front / lower roller, a front leather roller and a twisting-resistant leather roller, the middle / back / front drafting roller pair consists of a middle / back roller and a middle / back leather roller, the middle drafting roller pair consists of a middle roller and a middle leather roller, and the middle / back roller in a four-roller drafting mechanism is the narrow groove type negative pressure roller. The conventional ring spinning is transformed form the structure of the device, so that the drafting times can be effectively improved, and the gross drafting times can be improved by more than 250 times, and the middle / back roller is replaced by the narrow groove type negative pressure roller, so that the drafting effect and the fiber collecting effect can be effectively improved. Furthermore, due to a cotton-collecting three-air way technology on a ring spinning frame, a collecting negative pressure fan which needs adding in the process of transforming can be eliminated, the energy consumption of a system can be reduced, the material consumption in the process of transforming can be reduced, and the transforming cost can be reduced; and compared with the other prior arts, the device is simple and convenient to install, and high in cost performance.

The invention discloses transportation equipment convenient for transferring silicon cutting slag. The transportation equipment comprises a pedestal, a hydraulic cylinder and a sieving hopper, whereina sieving plate is arranged in the sieving hopper; a feed inlet and a feed outlet above the sieving plate are formed in the wall surface of the sieving hopper; a feeding plate is arranged in the feedinlet and a discharge plate is arranged in the feed outlet; a slag inlet and a slag outlet below the sieving plate are also formed in the wall surface of the sieving hopper; a slag inlet plate is arranged in the slag inlet and a filter tank is connected with the slag outlet through a slag inlet pipe; the filter tank comprises a shell, an exhaust tube above the slag inlet pipe is arranged on the shell, and a filter screen is arranged on the exhaust tube; a plurality of slag traps parallel to a horizontal plane are arranged in the shell from top to bottom; and a through hole is formed in each of the slag traps to communicate with the top of each of the slag traps and the bottom of each of the slag traps. According to the transportation equipment, silicon slags and silicon materials with different sizes can be classified and transported in batches, in addition, the silicon slags and the silicon materials can be further sieved in a transportation process, and the silicon slags detached from the silicon materials are fallen into a silicon slag placement cavity and are collected.

The invention discloses a pot-type carbon calciner in the field of carbon production, in particular to a pulling plate operating device for a pot-type carbon calciner. The pulling plate operating device comprises a pulling plate brick, a pulling plate seat brick and an operating hole, wherein a through hole is arranged on the pulling plate seat brick and communicated with a volatile component or hot air passage, a guide groove is arranged on the pulling plate seat brick, the pulling plate brick is put in the guide groove, a push-pull eyelet is arranged on the pulling plate brick, a bent hook at the hooked end of a screw tool hook is arranged in the push-pull eyelet and the screw tool hook extends out of the operating hole. The invention has the advantages that because no cold air is sucked into the flame path, the stability of the negative pressure and the temperature field is ensured, and the quality of the calcining product can be guaranteed; the pulling plate operating device is easy to operate, is free from the radiation of high temperature in the flame path and is beneficial to improving the labor protection level of the operators; the push-pull eyelet on the pulling plate brick is not required to be aligned, the pulling plate brick can be drawn out or pushed in by rotating the spiral handle with least labor and time; and the pulling plate operating device is simple in structure, is economical and practical and is easy to implement.

The invention discloses a constant-temperature constant-pressure adjustable cupping cup, which at least comprises a cup body, a vacuum pump and a main control unit. A heating device and temperature sensors are arranged on the cup body, and the heating device and the temperature sensors are connected with the main control unit, so that the goals of controlling the temperature in the cup body in real time and maintaining the temperature in the cup body in the constant-temperature state can be achieved; a throttle valve, a pressure relief valve and pressure sensors are arranged on a pipeline formed between the cup body and the vacuum pump, and the vacuum pump, the throttle valve, the pressure relief valve and the pressure sensors are connected with the main control unit, so that the goals of controlling the pressure in the cup body in real time and maintaining the pressure in the cup body in the constant pressure state can be achieved; an air exchange passage communicating with the outside is arranged on the cup body, so that external fresh air can be supplemented into the cup body at any time in the cupping process; and the air flow speed of the air exchange passage is smaller than the air suction speed of the vacuum pump, so that the inside of the cup body is enabled to be maintained in the relatively stable negative pressure state under the continuous work state of the vacuum pump.

The invention discloses a negative pressure puncture needle cylinder with adjustable pressure. The negative pressure puncture needle cylinder comprises a syringe needle cylinder body which is internally provided with a piston rod. A piston is arranged at the front end of the piston rod. A negative pressure control valve is arranged on a needle cylinder nozzle of the syringe needle cylinder body. A piston rod stretch and contract locking device is arranged on the syringe needle cylinder body and adjusts the magnitude of the negative pressure between the piston and the negative pressure control valve. The negative pressure control valve can be switched off before puncture, the piston rod is pulled backwards so that negative pressure can be formed in the syringe needle cylinder body, the negative pressure in the syringe needle cylinder body is adjusted through the piston rod stretch and contract locking device to meet the puncture requirements, the magnitude of the negative pressure in a needle cylinder syringe is further locked, the stability of the negative pressure in the needle cylinder syringe is kept, an operator can concentrate on positioning a focus, the influences of syringe piston pulling on negative pressure are effectively avoided, the influences of syringe shaking and distraction on positioning are effectively avoided, and the whole negative pressure puncture needle cylinder with adjustable pressure is light and attractive.

The invention relates to a continuous negative-pressure breathing-type moxa-moxibustion cupping device and method. By the aid of a traditional Chinese medicine moxa-moxibustion method burning a moxa cone or a moxa stick, biophysical properties and pharmacological effects of argy wormwood are sufficiently used, medical effects of the moxa-moxibustion cupping device cannot be replaced by electric moxibustion moxa can device, the cupping device solves the contradiction between air needed by burning the moxa stick or the moxa cone advocated by traditional Chinese medicine and negative-pressure cupping without air suction to some extent, products, heat and optical radiation generated by burning the moxa stick or the moxa cone can directly fit to projection skins under the actions of a breathing cavity, the beneficial products are effectively absorbed by the projection skins at the negative-pressure position, cupping therapy effects are remarkable, the inside of a cupping cavity can constantly maintain in stable negative-pressure state under the actions of a pressure control bag when moxa-moxibustion is performed, and the key problems are ignored by the other related inventions and patents.

The invention discloses an intelligent ink supply device with a multi-protection function and an implementation method thereof. The intelligent ink supply device comprises a secondary ink box, an ink supply passage and a negative-pressure gas circuit. The ink supply passage and the negative-pressure gas circuit are both connected with the secondary ink box. The negative-pressure gas circuit comprises a vacuum pump, a flow limiting valve, a two-position five-port manual valve, a negative-pressure cavity, a negative-pressure meter and a negative-pressure box. The vacuum pump is connected to one end of the two-position five-port manual valve through the flow limiting valve. The other end of the two-position five-port manual valve is connected with the negative-pressure cavity, the negative-pressure meter and the negative-pressure box. The ink supply passage comprises an ink supply pump control device, an ink barrel and an ink supply pump. The ink supply pump control device and the ink barrel are connected with the ink supply pump. Through cooperative action of the three protection measures, the situation that an ink supply pump supplies ink continuously, accordingly, ink overflows, and a vacuum pump is damaged can be effectively prevented. Meanwhile, since the negative-pressure cavity is additionally formed, the buffer volume of negative pressure is increased, and the negative pressure is more stable.

The invention relates to the technical field of digital printing, and discloses a novel scanning digital printing machine for printing paper. The novel scanning digital printing machine comprises a machine frame, a spray nozzle assembly, a printing platform mechanism and an ink path system with circulation. The spray nozzle assembly comprises a spray nozzle and is used for printing. The printing platform mechanism is located below the spray nozzle assembly. The ink path system with circulation supplies ink to the spray nozzle, and the spray nozzle is an Epson non-industrial spray nozzle. The spray nozzle assembly is used for printing, the ink path system with circulation is connected with the spray nozzle and supplies ink to the spray nozzle, and an ink supply assembly supplies ink to the ink path system, with circulation, of the whole spray nozzle. An ink circulation assembly is used for controlling the circulation and pressure difference relation of the spray nozzle. A positive and negative pressure control assembly is connected with the ink circulation assembly and used for controlling the positive and negative pressure of the ink circulation assembly. Through the ink circulation assembly and the positive and negative pressure control assembly, the whole ink path system with circulation can keep stable negative pressure, and therefore ink supply of the whole digital calico printing machine can be stable, the structure is simple, and the production efficiency is effectively improved.

The invention relates to a serial port level conversion method. The serial port level conversion method is characterized in that a negative voltage is provided to control a positive voltage through the cooperation of a transistor. When the transistor is on voltage is positive and when the transistor is off voltage is negative, and serial port level output conversion is achieved. The serial port level input conversion and state reversion are achieved through on-off of the transistor. The negative voltage is generated by oscillation. The realization of the scheme of the level conversion is changed from a traditional chip to discrete devices. The used discrete devices are an audion, a resistor and the like. The discrete devices are low in price, and few discrete devices are needed. The level conversion function is realized and cost is lower than the cost when the chips are used.

The invention discloses a negative-pressure control device for bucket foundation sinking and an application method thereof. The negative-pressure control device comprises a vacuum pump, a negative-pressure storage tank and a control system, wherein an electric contact vacuum meter measures the negative pressure in a bucket foundation, and the device determines whether to turn on a vacuum pump in combination with the set value so that stable negative pressure in the bucket foundation can be guaranteed for a long time; by controlling the on / off of the vacuum pump to stabilize the negative pressure, the volume of the negative-pressure storage tank can be appropriately reduced; and with relatively small negative-pressure storage tank, a relatively large scale of bucket foundation negative-pressure sinking test can be carried out. The device disclosed by the invention has the advantages of simple structure, space saving, long-time supply of stable negative pressure, automatic control of negative pressure and the like.

The invention relates to a black liquor combustion optimizing control system, comprising an input interface module, an input isolation module, an A / D conversion module, an algorithm module, a processor module, a D / A conversion module, an output isolation module and an output interface module which are sequentially connected. The input interface module acquires signals of furnace negative pressure, furnace temperature and black liquor flow in a black liquor incinerator and smoke oxygen concentration. The acquired signal is process by the isolation module and conversion module and then is sent to the processor module. The processor module calls a mathematical model of the algorithm module, the acquired signals are calculated, analyzed and processed, the processed data is stored and output, and the output data controls primary blowing rate, secondary blowing rate, tertiary blowing rate and black liquor flow by virtue of the conversion, output isolation and output interface modules, so as to realize optimal combustion of black liquor incinerator. By adopting the system, combustion efficiency of black liquor incinerator can be further improved, energy consumption can be reduced, and pollutant emission can be reduced; meanwhile service life of incinerator is prolonged, and economic benefit and environmental benefit of alkali recovery plant.

The invention discloses a serial number code spraying machine which comprises a code spraying unit, an ink supply unit, a printing unit and a control unit, wherein the code spraying unit, the ink supply unit and the printing unit are electrically connected with the control unit; the code spraying unit is formed by tightly connecting a sprayer body and a code spraying machine main body; the ink supply unit comprises a large ink pot, a small ink pot, a liquid pump and a liquid switch; the large ink pot in the ink supply unit is communicated with the atmosphere and is stored with ink; the liquid pump is connected with the large ink pot and the small ink pot; the liquid switch is arranged in the small ink pot and is linked with the liquid pump, so that a liquid level in the small ink pot is retained; the small ink pot receives ink transmitted by the liquid pump from the large ink pot and supplies the ink to the sprayer body; a pressure adjustment valve is arranged in the sprayer body and can adjust flow of the ink; the printing unit is an EPSON1390 printer; low-solubility ink is filled in the large ink pot and the small ink pot; the thickness of the ink sprayed code is 0.03 mm; and the main component of the low-solubility ink is an organic solution which has certain corrosive and chemical reaction.

The invention provides a chest drainage monitoring device, which comprises a hydrops cavity, a water seal cavity and a microprocessor electrically connected with a hydrops weight detection module, a hydrops cavity negative pressure detection module and a negative pressure generation module. The hydrops weight detection module is located below the hydrops cavity and is used for weighing the weightof hydrops. The hydrops cavity negative pressure detection module is installed in a closed container connected with the hydrops cavity through a conduit, and is used for detecting air pressure in theclosed container. The negative pressure generation module is connected with the water seal cavity through a conduit and is used for forming a negative pressure environment. The microprocessor is usedfor evaluating the drainage operation or postoperative recovery of a patient according to data acquired by the hydrops weight detection module, the hydrops cavity negative pressure detection module and the negative pressure generation module. The device can accurately detect data at different times in real time, and is convenient for medical personnel to accurately and timely obtain the situationof patients.

A fuel vapor management system for recovering fuel vapors displaced from vehicle fuel tanks, or the like, during the filling thereof from a bulk storage tank (102) is disclosed that has excellent emission control and pressure management. A flow splitter (108) is disclosed that utilizes positive pressure and locates downstream of a vacuum pump (111). The flow splitter is used to direct a portion of the gasoline vapors and air returned from the vehicle to an adsorbent canister (115) and the remaining portion to the UST (102), in such a proportion that a selected UST vacuum may be achieved. The flow splitter (108) may be included as a part of the vapor management system that relies upon a rapidly purging canister system and may be regenerated between vehicle refuelings, while minimizing canister volume requirements and stabilizing negative UST pressures. The disclosed system may be installed at the dispenser or centrally located.

The invention discloses a spray dryer. The spray dryer comprises a discharging opening, an air inducing system, a feeding system, an air supply system, a drying chamber and a machine body. The upper part of the machine body is a cylinder; the lower part of the machine body is a conical cylinder; the discharging opening is formed in the bottom of the machine body; the air inducing system is provided with a water cooling device, and an exhaust fan is arranged at the top of the machine body and provided with a frequency converter; and the feeding system is provided with a material pumping pump and a purifying barrel, the purifying barrel is in threaded connection with a material liquid tank, an electric heating pipe is electrically connected with an electric heater, an air blower is providedwith an air volume controller, and an air filter screen is arranged between the electric heating pipe and the air blower. The spray dryer has the beneficial effects of being simple in structure, convenient to operate and high in drying efficiency; the adaptability to materials is high, and a cold drying mode and a hot air drying mode can be switched; the strong cyclone in the conical cylinder ensures the drying uniformity of a feed liquid in the drying process; and the design of the frequency converter and the air volume controller ensures the stability of negative pressure in the machine body.

The invention relates to the technical field of intelligent household appliances, and discloses a range hood comprising a draught fan, a smoke exhaust passageway, an air supplement passageway, an air volume adjusting device, a harmful gas sensor and a processor assembly. The draught fan comprises a first air outlet and a second air outlet. The smoke exhaust passageway communicates with the first air outlet. The air supplement passageway communicates with the second air outlet. The air volume adjusting device is arranged on one side of the second air outlet and can adjust the opening degree of the second air outlet. The harmful gas sensor is used for acquiring indoor harmful gas concentration. The processor assembly is used for confirming the indoor harmful gas concentration obtained by the harmful gas sensor and controlling the air volume adjusting device to adjust the opening degree of the second air outlet according to the indoor harmful gas concentration. In the range hood, the situation that the concentration of harmful gas in a kitchen is increased due to incomplete filtration of cooking fumes in the air supplement process, and then the body health of a user is affected is prevented. The invention further discloses a method and device for controlling the range hood.

The invention provides a sweeping robot which comprises a shell, a draught fan assembly, an air inlet structure and an air outlet structure, the draught fan assembly, the air inlet structure and the air outlet structure are arranged in the shell; the draught fan assembly comprises a draught fan, the air outlet structure comprises an air outlet channel and an air channel air outlet, and air is sucked in from the air inlet structure, passes through the draught fan, enters the air outlet structure and is finally exhausted from the air channel air outlet. The draught fan and the air channel air outlet are arranged on the two sides of the shell respectively, the air outlet channel is arranged between the fan and the air channel air outlet, and the draught fan is communicated with the air channel air outlet through the air outlet channel. According to the sweeping robot, the draught fan and the air channel air outlet are located in the two sides of the shell correspondingly, and superposition and amplification of noise are avoided; meanwhile, the air outlet channel is located between the draught fan and the air channel air outlet, the space between the draught fan and the two sides, where the air channel air outlet is located, of the shell is utilized, and the air outlet channel is prolonged on the premise that the size of the sweeping robot is not increased; and the length of the air outlet channel is increased, so that the noise generated when air flows in the air outlet channel is very low.

The invention relates to a thoracic close drainage device which comprises a drainage bottle (9), a thoracic close drainage tube (6), catheters (11) and a vacuum extractor (10). The thoracic close drainage device is characterized in that the drainage bottle (9) comprise a first partition (1), a second partition (2) and a third partition (3) which are not communicated with one another. The three partitions are connected through the catheters (11). The first partition (1) is connected with the thoracic close drainage tube (6) and communicated with a thoracic cavity. The third partition (3) is connected with the vacuum extractor (10). Compared with the prior art, the thoracic close drainage device has the advantages that vacuum in the drainage bottle can be kept continuously and accurately adjusted through the vacuum extractor, drainage fluid removing is facilitated, and medical resource waste is avoided.