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.

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 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 a detection device for detecting absence of a trolley fire grate bar. The detection device comprises a detection rod device, a fixing rod and a limiting device. The detection rod device comprises a detection rod, a detection wheel and a counter weight. An included angle is formed between the upper end and the lower end of the detection rod, and the inclination direction of the upper end of the detection rod is coincident with the running direction of a trolley. The middle of the detection rod comprises a detection rod fixing hole, and the fixing rod can be placed in the detection rod fixing hole. The detection wheel is arranged on the head portion at the upper end of the detection rod, and the counter weight is arranged at the bottom of the lower end of the detection rod. The limiting device is arranged near the counter weight, and the counter weight makes contact with the limiting device when the detection rod device rotates. A detection method includes the steps that the detection device gives an alarm when the fire grate bar is absent; PLC alarming information is collected; the frequency of absence signals of the fire grate bar is analyzed; the position of the absent fire grate bar is determined; supplement of the fire grate bar is carried out.

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 thoracic cavity-type drainage device. A puncture needle is arranged below an injection syringe; a fixed support is arranged on the puncture needle; a drainage connector is arranged at the joint of the puncture needle and the injection syringe; one end of a drainage tube is connected with the drainage connector, and the other end of the drainage tube is connected with a drainage bottle; a throttle valve is arranged on the drainage tube; a seal cover is arranged on the drainage bottle; a pressure sensor is arranged on the seal cover; a vacuum cup lifter is connected with the drainage bottle; a display screen is arranged on the vacuum cup lifter. According to the thoracic cavity-type drainage device disclosed by the invention, the drainage bottle is arranged, and consists of three compartments; through the buffer of the drainage bottle, negative pressure in a first compartment can be ensured to be stable and is easy to regulate; the fixed support is also arranged, so the movement of the puncture needle and the injection syringe during working can be ensured, and the phenomena that drainage is interrupted and a patient is hurt due to the fact that the puncture needle and the injection syringe drop in a working process are avoided. The invention provides the thoracic cavity-type drainage device which is simple in operation, safe, fixed in puncture needle position, and controllable and constant in negative pressure.

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 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 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.