36results about How to "Control vacuum" patented technology

This invention relates to a heat conduction tube and its manufacturing method including the following steps: providing a tube with a first and a second open-end and fixing said tube, vacuuming said tube from the first open-end till the tube reaches to a pre-designed vacuum degree, sealing the first open-end to get a first sealed segment, injecting liquid from the second open-end and sealing it to get a second sealed segment. The heat conduction tube prepared by said method includes a sealed tube with a capillary structure and suitable working medium, in which, both ends of said tube are in staved sealed segments.

The invention relates to a device for testing formaldehyde and VOCs (volatile organic compounds) from furniture and decorative materials by bag method; the device mainly comprises a test bag, an air purification system, a vacuum control system and an air sampling system; a sample chamber of the device uses the test bag, a test sample is put in the test bag via a test bag opening / door and is locked and sealed via the test bag opening / door; the vacuum control system and the air purification system are communicated with the front end of the test bag; the air sampling system is communicated with the rear end of the test bag for sampling air. The device and method have the advantages of high test data accuracy, good repeatability, small error and the like, and are suitable for popularization and application.

A vacuum refreshing device for a refrigerator belongs to the field of vacuum refreshing. The vacuum refreshing device is arranged in a refrigerating box of the refrigerator, and comprises at least one vacuum box, a vacuum generation device for vacuumizing the vacuum box, and a vacuum control device for controlling pumping and preserving of vacuum. Through the arrangement of the vacuum generation device and the vacuum control device in the refrigerator, the degree of vacuum in the vacuum box is controlled well, so that food is isolated from air to be in negative-pressure and hypoxia environment, which prolongs the food refreshing time.

The invention relates to an additive manufacturing system capable of achieving rapid deposition on the surface of a workpiece through vacuum plasma. The additive manufacturing system comprises a vacuum obtaining and measuring device and a vacuum chamber; and a plurality of side wall cathode target pairs are installed on the side wall of the vacuum chamber. The additive manufacturing system is characterized in that a columnar cathode target and a rotary type bearing mechanism are installed at the center of the vacuum chamber; the columnar cathode target is connected with a high-power arc power source so as to output large currents; the power input end of the columnar cathode target is connected with the output end of a PLC control system; the PLC control system repeatedly conducts positive and negative pole input switching change to act in the electromagnetic field direction of the target face of the columnar cathode target, so that arc spots located on the target face upwards and spirally move along the target face and are transferred from one end to the other end; and the arc spots conduct repeated spiral transferring movement on the target face of the columnar cathode target to form a workpiece surface rapid circular deposition structure, and finally a thick coating is obtained on the surface of the workpiece rapidly. The additive manufacturing system has the beneficial effects of being high in deposition efficiency of the coating on the surface of the workpiece and the like.

The invention discloses a portable continuous negative-pressure suction instrument, and relates to the technical field of medical equipment. The portable continuous negative-pressure suction instrument comprises an instrument box internally provided with a vacuum pump and a lithium battery pack. A circuit control mainboard is arranged on the top face of the instrument box, and the side face of the instrument box is provided with a negative-pressure outputting opening and a vacuum meter; the pressure of the vacuum pump is controlled by a negative-pressure adjusting key, the vacuum meter is connected to an outputting pipe of the vacuum pump, and a negative-pressure connector of the vacuum pump is communicated with a drainage bottle through a negative-pressure connecting pipe extending out of the negative-pressure outputting opening; a drainage pipe is connected to the drainage bottle; the circuit control mainboard is further provided with a charging opening, a charging indicating lamp and a working indicating lamp. By means of the portable continuous negative-pressure suction instrument, the various problems that in an existing negative-pressure suction instrument, the pressure is unstable, a machine body is heavy, the size is large, convenience and fastness are not suitable, power supplying with a direct current is not achieved, and individual instruments need to artificially and manually extrude to carry out negative-pressure treatment can be solved.

The invention provides an RH refining method for controlling wettability of inclusions in low-carbon aluminum killed steel. Through controlling the components, the adding time, the adding amount and the adding mode of an inclusion modifier, and in cooperation of the vacuum degree control and process adjustment in the RH refining process, so that the surface of the aluminum oxide inclusions is completely covered or partially covered with 2Al-2 O-3.CaO and 6Al-2 O-3.CaO, and the modified form of the inclusions is surface modification or local surface modification. On the basis of controlling thevacuum degree of RH refining, the yield of the modifier can be improved, and the problem of molten steel pollution caused by the modifier is reduced. On the basis that the refining process and the period are not influenced, the surface wettability of the aluminum oxide inclusions in the molten steel is improved. The problem of water opening nodulation in the continuous casting process can be relieved, and the problem of liquid level abnormal fluctuation caused by the water opening nodulation is avoided; and the problem of aggregation of the aluminum oxide inclusions in the solidification process of the molten steel is relieved, so that the cleanliness of the molten steel is improved, and the product quality of the low-carbon aluminum killed steel is improved.

The invention provides a cooking control method, device, cooking utensil and computer-readable storage medium, wherein the cooking control method includes: detecting the operating temperature of the cooking part; size relationship, adjust the heating parameters and / or closed state of the cooking section. Through the technical solution of the present invention, when the cooking part is used to vacuum-preserve the contained materials, based on the corresponding relationship between the steam temperature and the degree of vacuum, the heating parameters and / or the heating parameters of the cooking part are adjusted according to the obtained operating temperature of the cooking part or a closed state to realize the control of the vacuum degree of the cooking part. Since it is only necessary to detect the working temperature of the cooking part during the control process, there is no need to set a pressure sensor or a pressure switch. Therefore, not only the manufacturing cost of the cooking appliance is effectively reduced, Moreover, the heating parameters and / or the sealing state of the cooking portion can be quickly adjusted to improve the reliability of the vacuum function of the cooking appliance.

The invention relates to a method for the batch production of granules made of polycondensation polymers by pre-condensating an oligomer at 5 to 400 mbar and by means of subsequent polycondensation in a rotating disc reactor and subsequent granulation. In the area of the discharge connection piece, the dragging surface density ranges between 1 and 8m<2> per m<3> in the reactor chamber and is steadily increased at an increasing distance from the discharge area. There is a viscosity gradient within the reactor and between the area that is the remotest from the discharge connection piece and the zone of the discharge connection piece. Thermal reduction of the polymer melt draining off from the reactor is compensated during granulation. The rotating disc reactor comprising a horizontal and longitudinal axis has approximately the form of a simple or double truncated cone. The reactor has rotatable, vertical product dragging surfaces and stationary strippers therebetween.

The invention relates to the technical field of refrigerators, in particular to a device and a method for controlling the vacuum degree of a vacuum refreshing refrigerator, which comprises a vacuum refreshing box, a vacuum pump, a pressure switch and a master control board, wherein the vacuum pump is communicated with the vacuum refreshing box, a pressure detection end of the pressure switch is communicated with the vacuum refreshing box, a pressure signal output end of the pressure switch is connected with the master control board, and a control signal output end of the master control board,which controls the action of the vacuum pump according to a pressure signal of the pressure switch, is connected with a signal input end of the vacuum pump electrically. In the control method, the pressure switch is used for detecting the air pressure of the vacuum refreshing box and outputting the pressure signal according to the air pressure to control the action of the vacuum pump. In the invention, the pressure switch is added to control the vacuum degree inside the refreshing box to be kept in a certain range all the time, and the control range is adjustable; moreover, the pressure switch has the advantages of simple structure and low cost and is safe and reliable.

The invention relates to a preparation method of an optical frequency band metamaterial based on gold-branch-shaped units and particularly relates to a preparation method of a metamaterial. The preparation method of the metamaterial comprises the following steps: firstly preparing the gold-branch-shaped units in an aqueous solution by using dodecyltrimethylammonium bromide as a template by virtue of a nano self-assembly method, then assembling the prepared gold-branch-shaped units into a single-layer array on a glass substrate, coating the surface of the single-layer array with a PVA (Poly Vinyl Alcoho) film and overlapping the single-layer array and a sheet of ITO (Indium Tin Oxide) conductive glass to form the metamaterial of a composite structure. The metamaterial shows relatively strong transmission passband peak in a visible light frequency band and has obvious plate focusing effect on light with corresponding wavelengths.

The invention discloses an air blowing type vacuum sucking disc and a vacuum adsorption device with the air blowing type vacuum sucking disc. The air blowing type vacuum sucking disc comprises an inner barrel, an adsorption disc which is arranged at the bottom of the inner barrel and covers an opening in the bottom of the inner barrel, and an outer barrel which is arranged outside the inner barrel in a sleeving manner, wherein negative pressure holes are formed in the side wall of the inner barrel; the inner barrel is provided with unidirectional sealing elements used for unidirectionally sealing the negative pressure holes; the unidirectional sealing elements prevent airflow from flowing from the outer side of the inner barrel into the inner barrel through the negative pressure holes; the adsorption disc is provided with suction holes; exhaust holes are formed in the side wall of the outer barrel; the exhaust holes are positioned below the negative pressure holes; and the bottom of the outer barrel and the bottom of the inner barrel are hermetically connected. According to the novel-structure vacuum sucking disc provided by the invention, ordinary vacuum sucking discs are made vacuum through extracting air with a vacuum machine; and in the air blowing type vacuum sucking disc, an air compressor is adopted to generate compressed air, the compressed air flows directionally at a high speed, and a vacuum state is achieved, namely, the vacuum state is achieved through adopting an air blowing method.

The invention provides a cationic dyeable PET and a composite elastic fiber prepared therefrom. The preparation method of cationic dyeable PET includes: mixing titanium dioxide, terephthalic acid and ethylene glycol and beating to obtain a slurry; performing esterification and precondensation on the slurry respectively, and adding dihydroxyisophthalic acid to the precondensation product Propyl ester-5-sodium sulfonate is initially melt-blended to obtain the primary product of cationic dyeable PET; the primary product of cationic dyeable PET is subjected to solid-phase viscosity increasing treatment to obtain cationic dyeable PET. Cationic dyeable PET / PTT composite elastic fiber is prepared by melt composite spinning of cationic dyeable PET and PTT. The technical solution provided by the invention effectively solves the problem that the current PET fiber is difficult to unify with full extinction and deep dyeing. The prepared product has good performance, high added value, easy process realization, and is conducive to large-scale production. It is suitable for elastic fabrics such as clothing and home textiles Wide application prospects.

The invention relates to an electromagnetic high-vacuum inflation valve. The electromagnetic high-vacuum inflation valve comprises an electromagnetic assembly, an armature, a valve element, an upper cover, a cloth clamping membrane, a membrane pressing plate, a membrane base, a filter plate, a body and the like. When the vacuum state of a vacuum system needs to be damaged and air is injected, the electromagnetic assembly is powered on, the valve element sucks the armature upwards, the gas pressure in a back pressure chamber and the gas pressure in a working gas chamber are changed, the membrane base and the cloth clamping membrane are disengaged from a pipeline opening in the body, and air entering the filter plate or an air filter is injected into the vacuum system. When the vacuum degree of the vacuum system decreases to a preset value, the electromagnetic assembly is powered off, force of an upper spring is downward, the cloth clamping membrane presses the pipeline opening in the body, and the vacuum system is closed. The electromagnetic high-vacuum inflation valve is connected into a vacuum pipeline, and the vacuum degree of the vacuum system can be damaged or controlled in time according to presetting.