36results about How to "Control vacuum" patented technology

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 discloses a method for producing ultrafine zirconium powder. The method comprises the following steps: mixing firearm zirconium sponge and electrolyzed zirconium serving as raw material zirconium, adding the mixture into a material receiving crucible of a hydrogenation reactor, igniting the raw material zirconium and hydrogenating to obtain zirconium hydride; putting the zirconium hydride into a ball-milling tank loaded with a ball-milling medium, and performing ball milling till the granularity of the zirconium hydride is smaller than or equal to 400 meshes; putting the smashed zirconium hydride into a vacuum drying oven for drying, loading the smashed and dried zirconium hydride into a dehydrogenating furnace for dehydrogenating, putting the dehydrogenated zirconium hydride into the ball-milling tank loaded with the ball-milling medium for performing ball-milling, sieving, washing and drying to obtain ultrafine zirconium powder. The method has the advantages that the raw materials are readily available, the technological process is stable, the phenomena of self-ignition and explosion are avoided, and the technical index and safety production requirements of the ultrafine zirconium powder can be met.

The invention discloses a method for controlling atmosphere of a sintering furnace. The method includes the steps of 1, dividing a heating zone of the sintering furnace to obtain a low temperature phase, a medium temperature phase and a high temperature phase; 2, setting corresponding upper and lower limits of vacuum degrees according to the low temperature phase, the medium temperature phase and the high temperature phase obtained in the step 1, and inputting the upper and lower limits of the vacuum degrees of the phases into a programming controller used in the step 1; 3, starting a vacuum pump to evacuate a body of the sintering furnace, acquiring actual vacuum degree of the sintering furnace, and allowing the programming controller to adjust a heating speed according to whether or not the acquired actual interior vacuum degree is between the upper and lower limits of the corresponding set vacuum degree. Heating speed of every phase is controlled via the programming controller.

The invention belongs to the technical field of polycarbonate devices, and particularly relates to a phenol steam injection vacuum system which is applicable to the polycarbonate devices. According tothe system, a first-level ejector 1, a first-level condenser 5, a second-level ejector 2, a third-level ejector 4 and a third-level condenser 7 are sequentially connected, and a second B-level ejector 3 is connected to a second-level condenser 6. The phenol steam injection vacuum system meets requirements in the polycarbonate production process, novel equipment with vacuum degrees needed by finalpolycondensation and pre-condensation reactors can be provided, the phenol steam injection vacuum system is reasonable in structural design and safe to use and can continuously and stably run, environmental pollution in the production process is low, and excellent-quality products can be produced by the polycarbonate devices.

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.

The invention provides a preparation technique of high-purity hydroxyethyl acrylate. A rectification process is added in a purification process; a polymerization inhibitor is replenished through a spraying way in a phase transformation process of the rectification process; meanwhile, the vacuum degree and the working temperature of a tower top are controlled; the flash polymerization, in a rectifying tower, of hydroxyethyl acrylate is avoided, so as to achieve the purposes of being stable in operation, being capable of effectively preventing polymerization and improving product quality, thereby improving the purity of a hydroxyethyl acrylate product.

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 discloses a two-effect titanium liquid concentration device and a concentration process. The concentration device comprises a preheater, a primary heat exchanger, a secondary heat exchanger, a flash tank, a film evaporator and an atmospheric condenser, wherein a solution outlet of the preheater is connected with a solution inlet of the primary heat exchanger; a solution outlet of the primary heat exchanger is connected with a solution inlet of the secondary heat exchanger by virtue of a circulating pump; a solution outlet of the secondary heat exchanger is connected with a solution inlet of the flash tank; a steam outlet of the flash tank is connected with a steam inlet of the preheater; a steam outlet of the preheater is connected to a first steam inlet of the condenser; a first solution outlet of the flash tank is connected with a solution inlet of the primary heat exchanger; and a second solution outlet of the flash tank is connected with a solution inlet of the film evaporator. According to the concentration device disclosed by the invention, the flow velocity of titanium liquid in the primary heat exchanger and the secondary heat exchanger is controlled by virtue of the circulating pump, the problem of scaling and blockage of heat exchange tubes in the heat exchangers in large area is solved, the total heat transfer coefficient of the heat exchangers is greatly improved, and the heat exchange area of the heat exchangers is reduced.

The invention discloses a grain direct shear test sample preparation device and a sample preparation method. The grain direct shear test sample preparation device comprises a lower cutting box, an upper cutting box, a box cover, an inserting pin, an impacting hammer and an air exhaust device (a motor, an air pump, an air storage tank and a switch). The problems of sample preparation devices and sample preparation technology for grain bulk direct shear tests are solved; through the sample preparation device and the sample preparation method, grain sample forming is guaranteed, height, flatness and compactness of a whole grain sample are ensured, and sample preparation efficiency is improved. The sample preparation device and the sample preparation method are simple to operate and suitable for direct shear sample preparation of different grain varieties.

The invention provides a cationic dyeable PET and a composite elastic fiber prepared from the same. A preparation method of the cationic dyeable PET comprises the following steps: mixing titanium dioxide, terephthalic acid and ethylene glycol, and pulping to obtain slurry; respectively carrying out esterification and pre-polycondensation on the slurry, adding dihydroxypropyl isophthalate-5-sodiumsulfonate into a pre-polycondensation product, and carrying out preliminary melt blending to obtain a primary product of cationic dyeable PET ; and carrying out solid-phase tackifying treatment on theprimary product of the cationic dyeable PET to obtain the cationic dyeable PET. The cationic dyeable PET/PTT composite elastic fiber is prepared from cationic dyeable PET and PTT through melt composite spinning. The problem that complete extinction and deep dyeing of PET fibers are difficult to unify at present is effectively solved, and the prepared product is good in performance, high in additional value, easy in process implementation and beneficial to large-scale production, and has a wide application prospect in elastic fabrics for clothing, home textiles and the like.

The invention provides a complete rectifying device for regeneration of waste oil, and relates to an oil purifier. According to the complete rectifying device for regeneration of the waste oil, a pretreatment tank, a reaction kettle, a fractionating tower, a distillation tower, a catalytic tower, a reboiling tower, a rectifying tower, a cooling tower, a gas-liquid separator, a semi-finished product tank, a desulfurizing tower, a light oil storage tank, a distillation vacuum pump unit, a filtration vacuum pump unit, a steam-water separator, a buffer tank, a filter tank, a fire isolating tank, an oil spill tank, a pneumatic valve box, a console and a power cabinet are sequentially installed on the ground and a mounting rack of the device, wherein vertical electric heating tubes are arrangedin the reaction kettle, the distillation tower, the catalytic tower, the reboiling tower and the rectifying tower. The device has a scientific and reasonable structure, and the defects in an existingpyrolysis rectifying system for regeneration of the waste oil can be overcome; the vertical electric heating tubes do not scale and get damaged easily, so that types of oil are adjusted and controlledat will, the effect of distillation of the waste oil is improved significantly, and the production cost of waste oil regeneration is reduced; therefore, the device has a promotion value.

The invention provides an outer barrier bag flushing liquid bag which is constituted by a package and flushing liquid in the package. The package comprises a liquid medicine layer, a leakage observinglayer and a gas barrier layer, and is particularly and sequentially provided with PP resin serving as a thermal-bonding layer, POE resin serving as a diaphragm layer, POE resin serving as a strengthlayer, POE resin serving as a bonding layer, thermoplastic resin serving as a thermal-resisting layer, negative pressure gas serving as the leakage observing layer, PP resin serving as a thermal sticky layer, nylon resin serving as a reinforcing layer, and PET resin serving as a barrier layer. The integration of the outer barrier bag flushing liquid bag and the flushing liquid and the high barrierproperty to liquid are achieved; if the liquid medicine layer generates micro pores, the leakage observing layer can absorb the micro-leakage flushing liquid, and water spots are generated on the leakage observing layer, so that the micro-leakage flushing liquid is advantageously removed through quality testing; and the pass rate of factory finished products of the flushing liquid packing bag isincreased, the more guaranteed flushing liquid is provided for a medical unit, and the medication safety of patients is ensured.

The invention unfurls a kind of filter of many heads. It include main tube, trestle for fixing main tube, the main tube has an open side a close side fixed switch. On the main tube, there are many other tubes, the side close to the main tube fixed switch. The invention's advantages are many operations at one time, separated switch, no effect to others, owning high effect, fast speed features. In the tube there is vacuum watch; tubes and trestle are made of plastic, so it also has the advantages of light and cheap.

The invention provides a cooking control method and device, a cooking utensil and a computer readable storage medium, and the cooking control method comprises the steps: detecting the working condition temperature of a cooking part; and adjusting the heating parameters and/or the closed state of the cooking part according to the size relationship between the preset vacuum fresh-keeping temperatureand the working condition temperature. According to the technical scheme, when the cooking part is used for carrying out vacuum fresh keeping on the contained materials, the heating parameters and/orthe closed state of the cooking part are/is adjusted according to the obtained working condition temperature of the cooking part on the basis of the corresponding relation between the steam temperature and the vacuum degree, so that control over the vacuum degree of the cooking part is achieved; in the control process, only the working condition temperature of the cooking part needs to be detected, and a pressure sensor or a pressure switch does not need to be arranged, so that the manufacturing cost of the cooking utensil is effectively reduced, the heating parameters and/or the closed stateof the cooking part are/is quickly adjusted, and the reliability of the vacuum function of the cooking utensil is improved.

The invention discloses a process for extracting health-care bunge cherry seeds. The process comprises the following steps: S1, pretreating raw materials to obtain raw material powder; S2, extractingraw material powder by adopting an ethanol solution reflux extraction method to obtain an extracting solution; S3, filtering the extracting solution to obtain filtrate; S4, concentrating the extracting solution to obtain concentrated paste; S5, determining the content of amygdalin and tulip in the concentrated paste; S6, performing alcohol precipitation treatment on the concentrated paste to obtain clear liquid; S7, filtering the clear liquid; S8, drying the filtered clear liquid to obtain dry tulip kernel powder; S9, determining the content of amygdalin and bunge cherry seed glucoside; S10, executing packaging and warehousing and storing the finished product. A decompression reflux extraction technology is adopted, so that the stability of the bunge cherry seeds is guaranteed at low temperature and low pressure; preliminarily filtering is executed by adopting an oscillating sieve to remove the large-particle residues of the bunge cherry seeds, insoluble substances are removed by adopting a diatomite vacuum filtration technology, the bunge cherry seed residues are recycled, and energy saving and environment protection are achieved.