126 results about "Tube change" patented technology

An infusion system and method for controlling the fluid flow from a pump includes a pump system that has a controller that utilizes an algorithm to control the flow rate of fluid through tubing. A plurality of electrodes operatively contacts an electrically conductive portion of the tubing that is also acted upon by the pump system. The electrodes monitor electrical properties of the tubing and provide an electric signal indicative thereof to the controller, which varies the flow rate of the fluid through the tubing as a result of the electric signal.

Provided is a liquid ejecting apparatus which includes a carriage which reciprocates in a state where a liquid ejecting head is mounted thereon, a tank unit which is provided outside the carriage and accommodates ink, four liquid supply tubes which communicate with the liquid ejecting head and the tank unit, and a tube support portion which supports the liquid supply tubes in a state where the liquid supply tubes are aligned in a horizontal direction, in which, in a case main body, the liquid supply tubes extend further to the tank unit side than a portion in which the liquid supply tubes are supported by the tube support portion, in a state where a parallel alignment direction of the four liquid supply tubes changes from the horizontal direction (a transporting direction) to a vertical direction.

The invention discloses a static random access memory (SRAM) with a redundant structure. The SRAM comprises first to fourth pull-up tubes, first to fourth pull-down tubes, first to fourth load tubes, and first to fourth gate tubes. On the basis of a conventional SRAM structure, the load tubes are added between drains of the pull-down tubes and the pull-up tubes; the threshold value of each load tube changes within a range of -VDDI/2-0v, so that under the condition of no soft error, the load tubes are in a turn-on state all the time, and memory information is kept; under the condition of existence of soft errors, through the load tubes and a feedback mechanism of the redundant structure, the memory information can be recovered. The SRAM with the redundant structure has the advantages of high soft error resistance, high stability, low power consumption and compatibility with a commercial logic process.

The invention belongs to the technical field of clock frequency division, in particular relates to a divide-by-2 frequency divider structure based on a standard complementary metal oxide semiconductor (CMOS) process and suitable for an ultra-wide band. The divide-by-2 frequency divider consists of two primary and secondary differential analog D latches, wherein each D latch is a dynamic bias taking a pair of differential N-channel metal oxide semiconductor (NMOS) tubes as an amplifying part, a pair of crossly coupled positive feedback NMOS tubes as a latching part, a pair of p-channel metal oxide semiconductor (PMOS) tubes as a load and a pair of clocked NMOS tubes as the amplifying part and the latching part respectively; the magnitude of the bias voltage of the PMOS tubes changes along with frequencies; and a frequency-voltage converting circuit provides a bias for the PMOS tube load. The divide-by-2 frequency divider structure can effectively increase the working frequency range of a frequency divider; and the ratio of an upper limit frequency to a lower limit frequency of the divide-by-2 frequency divider structure can reach about 250. The circuit of the invention has the characteristics of low power consumption and noise, high speed and the like.

The invention relates to an intermittent automatic tube drawing device which comprises a doffing trolley. The doffing trolley is arranged on a guide rail assembly and can travel, and the traveling route of the doffing trolley is parallel to the central line of a spindle of a spinning frame. The intermittent automatic tube drawing device is characterized in that the doffing trolley is provided with a traveling driving mechanism, a tube drawing mechanical arm and a control system, wherein the traveling driving mechanism is used for driving the doffing trolley to travel intermittently, the tube drawing mechanical arm is used for drawing yarn-loaded tubes on the spinning frame and collecting the yarn-loaded tubes, the control system is used for controlling the traveling driving mechanism and the tube drawing mechanical arm to act crossly, the tube drawing mechanical arm stops drawing tubes when the traveling driving mechanism drives the doffing trolley to travel, and the tube drawing mechanical arm starts to draw tubes when the traveling driving mechanism drives the doffing trolley to stop. The intermittent automatic tube drawing device has a smart structure and high automation degree, can realize automatic doffing so as to reduce labor intensity of workers, save the labor time, and improve the doffing efficiency, yarn collecting efficiency and empty tube changing efficiency, and has high action accuracy, lower production cost and low fault rate.

The invention discloses a heat exchanger, which comprises a first collecting pipe, a second collecting pipe separated from the first collecting pipe, heat exchange tubes and fins, wherein a refrigerant channel is arranged in each heat exchange tube; two ends of each heat exchange tube are respectively connected to the first and second collecting pipes so as to communicate with the first and second collecting pipes through the refrigerant channel; the whole cross section area of the refrigerant channel in the heat exchange tube changes along the flowing direction of the refrigerant in the heat exchange tube in order to keep the flowing speed of the refrigerant in the flowing direction thereof; and each fin is arranged between adjacent heat exchange tubes. In the heat exchanger of the embodiment of the invention, the whole cross section area of the heat exchange tubes at an inlet and outlet of the refrigerant changes following the state of the refrigerant and the flowing speed of the refrigerant in the heat exchange tube is kept even, so the whole efficiency of the heat exchanger is promoted and the heat exchange property of the heat exchanger can be better performed.

A heat extraction system is provided for a laptop computer that comprises a system unit that includes a set of heat sources and a video display unit that is movably attached to the system unit. The laptop computer has air inlets and air outlets that allow air to flow into the system unit, over the heat sources forming heated air, and exhaust the heated air. The laptop computer has a set of tubes, which have an inlet and an outlet, located behind a video display in the video display unit and an air connection from the air outlets to each inlet in the tubes. The set of tubes are formed such that heated air passing through a constriction in the set of tubes changes in velocity and pressure in order to satisfy the conservation of flow rate. Thus, heat produced by the heat sources is extracted from the laptop computer.

The invention relates to a vacuum thermal-insulated tube, which comprises a tube whose two ends are connected with flanges. It is characterized in that: the tube is sheathed with a sheath with continuous ripple structure to form a vacuum chamber. The invention has simple structure and improved stress relation to avoid crack caused by the temperature difference between inner and outer tubes. And the ripple structure can release the tube change, to reduce the cost of connecting tube. The invention has lower cost and wider application for transmitting high-temperature water or steam.

The invention discloses a paper tube cutting machine which comprises a driving unit and a cutting unit. The driving unit comprises a motor and an air cylinder. The air cylinder is connected with the cutting unit. The cutting unit specifically comprises round blades arranged on a cutting shaft in a sleeved mode, and a shell arranged above the blades. One side of the cutting shaft is provided with a bearing which is connected with an air cylinder, the rotation angle of the bearing is controlled through the air cylinder, and therefore the position of the cutting shaft is controlled. A rotation shaft is arranged below the blades, and the diameters of the two ends of the rotation shaft are large. The middle of the rotation shaft is sleeved with a rubber sleeve, and the rotation shaft is connected with a motor. In the machining process, a paper tube is arranged on the rotation shaft in a sleeved mode, the paper tube cutting machine is further provided with a material return unit which specifically comprises a material return ring and a guide rail. The guide rail is arranged below the rotation shaft, and the material return ring is arranged on the guide rail and driven by another air cylinder. According to the paper tube cutting machine, multiple sets of paper tubes can be machined at a time, efficiency is higher, cost is lower, and maintenance is more convenient. In addition, when the machining widths of the paper tubes change, only the distance of the round blades needs to be changed.

The invention discloses a CRM Buck PFC convertor with optimal frequency variation range. The CRM Buck PFC convertor with optimal frequency variation range comprises a main power circuit, a CRM control and driving circuit, a voltage feed forward circuit, a first multiplying unit, a second multiplying unit and an output voltage feedback circuit; the output end of a first follower circuit is respectively connected to two input ends of the first multiplying unit and one input end of a first subtraction circuit; the output end of a second follower circuit is respectively connected to two input ends of the second multiplying unit and the other input end of the first subtraction circuit; the output ends of the first multiplying unit and the second multiplying unit are respectively connected with two input ends of the second subtraction circuit; the output ends of the first subtraction circuit and the second subtraction circuit are respectively connected with two input ends of a third subtraction circuit; the output end of the third subtraction circuit is connected with the input end of the CRM control and driving circuit. The turn-on time of the switch tube changes according to certain rule in a power frequency period due to that the voltage feed forward circuit is used, and the switching frequency variation range is optimized.

The invention discloses a method and device for controlling a critical continuous mode unit power factor flyback converter. The method and device are used for improving the power factor of the critical continuous mode flyback converter. According to the method, the current peak envelope of a primary side switching tube of the critical continuous mode flyback converter is controlled, so that the current peak envelope of the switching tube changes along with changes of input voltage and output voltage within a power frequency cycle, and turn-off time of the switching tube is decided by the zero-crossing moment of a secondary side current of a transformer. Thus, the unit power factor of the critical continuous mode flyback converter can be obtained within the whole input voltage range.

The invention discloses an LDO circuit, which comprises an overshoot suppression circuit and an LDO main circuit; the overshoot suppression circuit comprises a current comparator, wherein the currentcomparator comprises two comparison current sources and a second PMOS tube serving as a switch between the two comparison current sources; and the grid electrode of the second PMOS tube is connected with the grid electrode of a mirror image NMOS tube corresponding to the tail current. The overshoot suppression circuit also includes a first capacitor and a third PMOS tube. The drain of the third PMOS tube is connected to the gate of the first PMOS tube of the LDO body circuit. In the electrifying process, before the power supply voltage rises to be less than or equal to the sum of the thresholdvoltages of the mirror NMOS tube and second PMOS tube, the second PMOS tube is turned off, the first comparison current source pulls down the gate voltage of the third PMOS tube so that the gate voltage of the first PMOS tube changes along with the power supply voltage, thereby preventing power-on overshoot; and the third PMOS tube is disconnected after the power-on is finished so as to avoid influencing the LDO main circuit.

The invention relates to a password-stealing-preventing random-variation numeric keypad comprising function keys, numeric keys and a control circuit. Each key comprises a keycap, a digital tube display, conductive rubber triggers, support sleeves, support pillars, a thin-film touch panel and a circuit board, the thin-film touch panel is fixedly mounted on the circuit board, the conductive rubber triggers are fixedly mounted on the thin-film touch panel, the keycap is mounted on the conductive rubber triggers through the support sleeves and the support pillars in a guiding and sliding manner, and digital tubes are fixedly mounted on the thin-film touch panel below the middle of the keycap. The keypad aims to overcome defects of a traditional password keypad, and an 89C51 single chip microcomputer generates random numbers by the aid of an internal timer and a method of interrupt coalescing; the dynamic random-number password-stealing-preventing keypad, allowing positions of numbers from 0 to 9 displayed by the LED seven-segment digital tubes changing randomly, can not only be applied to password entering of ATMs (automatic teller machines), but also be widely applied to various other devices, utilizing keypads for entering passwords, such as POSs (points of sales), safety boxes and antitheft doors, and is of great significance to development of national economy and protection of civil information.

The invention relates to a detection sampling device in the field of agriculture, in particular to a turntable type plant leaf sampler and a sampling method. The sampler comprises a base, a rotating disc arranged on the base through a positioning disc and a cutting handle matched with the rotating disc; the rotating disc is arranged at the upper end of a central rotating shaft, the lower end of the central rotating shaft penetrates through the center of the positioning disc, and a cutting knife on the cutting handle is matched with a cutting hole formed in the edge of the rotating disc. The sampler can be used for efficiently completing plant leaf sampling, a plurality of leaves can be continuously sampled, continuous tube changing is achieved, and convenience and quickness are achieved. The situation that samples are mixed can be greatly avoided, and the sampler is small in size and low in weight and can be conveniently used in laboratories and carried for field sampling.

The invention discloses a capillary structure-based optical fiber high-temperature sensor and a preparation method thereof. The sensor comprises a capillary tube. The two ends of the capillary tube are respectively provided with an input optical fiber and an output optical fiber. The input end of the optical fiber high-temperature sensor is connected with a light source through the input optical fiber. The output end of the optical fiber high-temperature sensor is connected with a spectrograph through the output optical fiber. The input optical fiber and the output optical fiber are single-mode optical fibers. The inner diameter of the capillary tube is 75 mum. The outer diameter of the capillary tube is 125 mum. The length of the capillary tube is 10 to 50 mm. when the ambient temperature of a detection area changes within the range of 0 to 1000 DEG C, the wavelength of each transmission peak in the capillary tube changes correspondingly. Through detecting the changing condition of the wavelength of the transmission peak by means of the spectrograph, the temperature change can be detected. The optical fiber high-temperature sensor is simple in structure, low in cost and high in measurement precision.

The invention discloses a voltage-controlled oscillator circuit with frequency not changing with temperature. The circuit comprises a first cross coupling tube, an LC oscillating circuit connected with the two output ends of the first cross coupling tube in parallel, a second cross coupling tube connected with the LC oscillating circuit in parallel, a mirror image current source circuit, a divider resistor arranged between the first cross coupling tube and the output end of the mirror image current source circuit, and a filter capacitor connected with the output end of the mirror image current source circuit. Because a pair of variable capacitors are arranged on the LC oscillating circuit and negative temperature coefficient current with slope is input to the mirror image current source circuit, on the premise that the complexity and the power consumption of the circuit are not increased and high performance is achieved, it is avoided that because the working state of the first cross coupling tube and the working state of the second cross coupling tube change, the oscillating frequency at the signal output end of the VCO circuit changes, and finally, the frequency drift caused by temperature changes can be effectively overcome or counteracted.