364results about How to "Reduce energy saving" patented technology

The invention provides a downlink control information configuration method which comprises the following steps: a base station configures a plurality of sets of information for a terminal through a special high-level signaling for the terminal; and the base station instructs the terminal to adopt one set of the information configured by the special high-level signaling for the terminal to receive a DMRS and / or a physical downlink shared channel PDSCH according to related information of DCI Format 1A. The invention further provides a downlink control information acquisition method which comprises the following steps: the terminal acquires the plurality of sets of information configured by the base station through the special high-level signaling for the terminal; and the terminal determines which set of the information among the plurality of sets of information is adopted to receive a DMRS and / or a physical downlink shared channel PDSCH according to the related information of DCI Format 1A. The invention further provides a base station and a terminal.

The invention discloses a heat pipe composite air conditioning unit for a machine room and a control method of the heat pipe composite air conditioning unit. The heat pipe composite air conditioning unit is characterized in that a heat pipe module and a refrigerating module are combined to form a cold source system in the air conditioning unit, the refrigerating module consists of a compression unit, a condenser, a throttling mechanism, an evaporation channel of an evaporation condenser and the like which form a first working medium circulating loop, the heat pipe module consists of an indoor heat exchanger, a main electromagnetic valve, an air-cooling heat exchanger, a condensation channel of the evaporation condenser, a liquid storage device, a liquid pump and the like which form a second working medium main loop, a bypass branch is arranged between an outlet of the indoor heat exchanger and an inlet of the condensation channel of the evaporation condenser, and a bypass electromagnetic valve is disposed in the bypass branch. A wide annular temperature zone is divided into three functional zones including a refrigerating zone, a composite zone and a heat pipe zone, and working modes of running refrigerating circulation, composite circulation and heat pipe circulation are correspondingly switched and run by the cold source system according to the different functional zones. By the aid of the heat pipe composite air conditioning unit and the control method thereof, utilization of outdoor natural cold sources can be maximized, and low-cost running and energy conservation can be realized.

The invention discloses an energy-saving type single-phase alternating current machine starting protector, and belongs to the technical field of refrigerating compressor. The energy-saving type single-phase alternating current machine starting protector comprises a shell, a single-phase alternating current machine starter, a single-phase alternating current machine protector and a shell cover; a positive temperature coefficient thermistor cavity and a single-phase alternating current machine protector cavity are formed in a shell cavity; the single-phase alternating current machine starter comprises a positive temperature coefficient thermistor, a first pin and a second pin; the single-phase alternating current machine protector is arranged in the single-phase alternating current machine protector cavity; the shell cover is matched with the shell. The energy-saving type single-phase alternating current machine starting protector is characterized in that a plug-in piece is extended from a reed of the first pin, and a plug-in-piece hole, a first pin hole, a second pin hole and a protector pin hole are formed in the shell; a pair of bottom-wall top embossments are formed in the cavity bottom wall of the positive temperature coefficient thermistor cavity, side-wall top embossments are formed in the side cavity walls and the rear cavity wall, the lower portion of the positive temperature coefficient thermistor is supported by the pair of bottom-wall top embossments, the front side of the positive temperature coefficient thermistor is contacted with the front cavity wall top embossments, and the rear side of the positive temperature coefficient thermistor is contacted with the rear cavity wall top embossments. The energy-saving type single-phase alternating current machine starting protector has the advantages that the energy-saving effect is good, the size is small, and the weight is light; the installation is convenient; a mold structure is simplified; electric short-circuit is prevented; the assembling efficiency is high.

The invention relates to a rare earth lanthanum and cerium sulfate which can be used as a red paint and a preparation method of the rare earth lanthanum and cerium. The chemical formula of the paint is: AxLayCe1-yS(3+x) / 2, wherein, A stands for one of alkali metals lithium, sodium and potassium, x is equal to or bigger tan 0 and is equal to or smaller than 1, and y is equal to or bigger tan 0 and is equal to or smaller than 1. The alkali metal elements are doped into the rare earth lanthanum and cerium sulfate matrix to prepare rare earth sulfide paints in different red color systems through adjusting the doped amount of the alkali metal elements and different proportions of the lanthanum and cerium in high temperature solid-state reaction with mixed sulfate source gas produced by ammonium thiocyanate being heated and melted as reaction gas under the conditions of unoxidizing atmosphere with inert gas being input and the heating temperature of 400 to 1000 DEG C. The structure of a series of rare earth lanthanum and cerium sulfate doped with the alkali metal elements is NaC1type or Th3P4 type of gamma type in single cubic crystal system. The preparation method is safer and more environment protecting, the paint is non-toxic, so that the paint can be used for coloring for plastic, oil paint, coating, rubber, leather, ceramic, ink, paper, cosmetic and construction material like cement.

The invention provides an air conditioning system integral optimized control device. The device comprises a host (101), a weak current control system (102), and a strong current control system (103), wherein both the weak current control system (102) and the strong current control system (103) are connected in parallel with the host (101) via an RS485 communication interface. The control device provided by the invention realizes the control completely compatible and parallel with an original central air conditioning control circuit, and has a local control mode and a remote control mode, wherein the local mode is applicable to site button operation, and the remote mode is applicable to remote computer remote control operation. The remote mode is divided into an automatic mode and a manualmode, wherein the manual mode can realize remote inching equipment operation, and the automatic mode can realize the full-automatic, failure-free and optimized operation of the central air conditioning system.

The invention provides an intelligent marshalling combination switch, comprising an AC electronic switch, a magnetic latching relay and a control circuit. The intelligent marshalling combination switch is characterized in that the control circuit is connected with at least a group of combination switches; the structure of the combination switch is that the AC electronic switch is connected in parallel with the magnetic latching relay with one-way contacts; the parallel end is connected in series with the magnetic latching relay with bidirectional contacts and the other parallel end is connected with one end of a single-phase capacitor and one end of a discharge coil; the other end of the single-phase capacitor and the other magnetic latching relay with bidirectional contacts are connected in series with each other and are connected into a return circuit. The intelligent marshalling combination switch can lead the single-phase capacitor to be freely switched without disturbance between the phase lines of the three-phase AC circuit and between the phase line and the zero line of the three-phase circuit, realizes the star-delta unequal arbitray connection of the single-phase capacitor under the control of a controller, completes adjusting the asymmetrical active load of the transformer and compensating the reactive loads at the same time, leads the transformer to be changed from the asymmetrical running to the symmetrical running, saves the power energy, and leads the power supply to have high quality and reliable running.

A technology for making energy-saving brick from paper-making mud includes such steps as proportionally mixing said mud with clay, shaping by brick maker, drying and calcining at 900-1050 deg. C. Its advantages are low energy consumption and high insulating performance of brick.

The invention relates to a centrifugal casting duplex-metal composite ring part hot extend-rolling forming technology, and belongs to the technical field of ring part rolling expansion machining. The centrifugal casting duplex-metal composite ring part hot extend-rolling forming technology is characterized by comprising the following steps: (1) isothermal heating is carried out; (2) a heated duplex-metal composite ring blank is placed on a radial and axial direction ring rolling machine; (3) the contact relation between a forming roller and the ring blank is determined; (4) a driving roller drives the duplex-metal composite ring blank and a core roller to perform rotation motion, meanwhile, the core roller does straight line feeding motion in the radial direction of the ring blank, an end face taper roller only keeps the rotary motion rather than conducting axial feeding, and continuous local plastic deformation of wall thickness reduction, diameter enlarging and cross section layout shaping is continuously carried out on the duplex-metal composite ring blank; and (5) when a preset value of the outer diameter of a duplex-metal composite ring part is obtained, a guide roller gives out a signal, the core roller stops feeding, and extend-rolling is finished. The centrifugal casting duplex-metal composite ring part hot extend-rolling forming technology has the beneficial effects that the process procedure is shortened, the device investment is reduced, and energy and materials are saved; and meanwhile, the composite ring part interface plastic deformation is sufficient, the bonding strength is high, the mechanical property is good, and the service life is long.

Disclosed is a lubricant composition for fluid dynamic bearings which contains, as a base oil, 50-100% by mass of an ether compound having at least one ether bond and 11-34 carbon atoms, and has a kinematic viscosity at 100 DEG C of not less than 2.2 mm2 / s. Such a lubricant composition for fluid dynamic bearings has good low-temperature fluidity and such excellent viscosity characteristics that viscosity decrease is small even in the high temperature range. The lubricant composition further has low evaporativity, energy saving properties and heat resistance stability, and is thus suitable for compact fluid dynamic bearings which are rotated at high speed.

The invention relates to methods for extracting high-quality shrimp oil from Antarctic krill and for preparing defatted krill protein powder. The methods comprise steps that: an Antarctic krill raw material is pretreated; the pretreated raw material is cooked; the cooked raw material is dehydrated by pressing; the dehydrated raw material is crushed and beaten, such that a cream is obtained; an organic solvent is added to the obtained cream, and shrimp oil lixiviation is carried out with a homogenization technology; shrimp oil is repeatedly lixiviated; obtained lixiviation liquids are combined; the mixed liquid is subject to a cold preservation treatment, and is filtered; an obtained filtrate is subject to vacuum evaporation, such that the filtrate is precipitated and dehydrated, and refined shrimp oil is obtained. According to the invention, water content in Antarctic krill is reduced by using a pressing technology which is used for replacing a heating drying technology, such that an energy-saving effect is substantial. With the beating crushing technology and the homogenization extraction technology, the lixiviation efficiency is substantially improved. Therefore, a low-temperature normal-pressure high-efficiency fresh krill wet lixiviation technology is realized, and the shrimp oil with high astaxanthin content can be obtained. The cream obtained by lixiviation by using the organic solvent is dried by heating, such that defatted krill protein powder with water content lower than 10% is obtained, and the solvent is recycled. The method provided by the invention has feasibility for industrialized implementations.

The invention discloses a construction method of a prefabricated wallboard. The construction method of the prefabricated wallboard comprises the following steps of 1, numbering the prefabricated wallboard after the wallboard is prefabricated in a factory, and transporting the prefabricated wallboard to a site; 2, checking components and confirming the number; 3, before hoisting, constructing the bottom laying position of the prefabricated wallboard; 4, hoisting and installing the prefabricated wallboard, wherein before the prefabricated wallboard is hoisted, upper and lower supporting end bases of an inclined strut are firstly installed, after the prefabricated wallboard is hoisted, the prefabricated wallboard is adjusted in position and is connected with the inclined strut to be fixed, then a tower crane hook is unhooked, the perpendicularity of the prefabricated wallboard is adjusted, finally, the periphery of the prefabricated wallboard is sealed, and a grouting sleeve is utilized to conduct mortar injecting. By means of the construction method of the prefabricated wallboard, a component assembly mode is adopted, a structural wallboard is divided into multiple blocks, after being prefabricated in the factory, the prefabricated wallboard is hoisted and installed on spot, and certain construction treatment is conducted, which helps to improve the construction quality, accelerate the engineering progress, and improve the building quality.

The invention relates to an optical network unit (ONU) energy-saving method for improving bandwidth utilization rate, which comprises the following steps that: an optical line terminal (OLT) sets a judgment condition that the ONU enters an energy-saving state; the OLT respectively sets the starting time of a first energy-saving period when the ONU enters the energy-saving state, the duration of a sleep mode, the duration of a work mode, and the times of the energy-saving period and sets a minimum authorization interval T1; when the ONU meets the judgment condition of the energy-saving state, the OLT sends a permission message for entering the energy-saving state; after receiving the permission message, the ONU checks whether data needing sending exists or not at the time; if the data needing sending do not exist, the ONU is switched to the energy-saving state from a normal state in the set time of the first energy-saving period; after entering the sleep mode, the ONU is immediately switched to the normal state if the data needing sending exist; and when the periodic alternate times of the sleep mode and the work mode reach a set value, whether the energy-saving condition is met or not is rejudged. By the method, the communication times between the OLT and the ONU can be reduced and the bandwidth utilization rate is improved.

The invention relates to an optimization system and method for sootblowing of a circulating fluidized bed boiler. A heat-delivery surface pollution factor monitoring module is used for establishing a predictive model of pollution factors of an overheater or a reheater, pollution factors of an economizer, pollution factors of an air preheater, exhaust gas temperature and boiler efficiency by an epsilon-fuzzy tree method through process data which is read by a data communication module from a DCS; then a heat-delivery surface pollution factor optimizing module uses the exhaust gas temperature and the boiler efficiency as guiding and adopts an improved drosophila optimization algorithm for optimizing a predictive value in the heat-delivery surface pollution factor monitoring module so that an optimal set value with adjustable variables is obtained, and the optimal adjustable variable value is transmitted to the DCS through the data communication module so that the operation of site equipment is guided; a heat-delivery surface sootblowing decision-making module is used for setting a critical pollution factor value through real-time monitored situations, and when the monitored heat-delivery surface pollution factors exceed critical pollution factors, sootblowing of a heat-delivery surface is guided. According to the optimization system and method disclosed by the invention, the purposes of energy-saving sootblowing and sootblowing as required are fundamentally achieved.

The present invention discloses phosphorous ground slag cement mortar, and comprises ordinary silicate cement, phosphorous ground slag, sand and water. On the one hand, the phosphorous ground slag used in the present invention is used as mixed material to substitute the cement in equal weight to be mixed into the pre-mixing commodity mortar, thus reducing the consumption volume of the cement; on the other hand, the retardation property of the phosphorous slag is used to obviously prolong the condensation time, thereby overcoming the weakness that the retardation agent must be added into the traditional pre-mixing commodity mortar, and can realize the effect similar to the adding of the retardation agent. Therefore, the present invention makes full use of the effect of the phosphorous to improve the workability of the mortar, thereby greatly reducing the production cost, and reducing the environmental pollution.

A cleaning water discharge apparatus provided with a cleaning water discharge means, a water supply means for supplying cleaning water to the cleaning water discharge means, and a bubble mixing means for mixing bubbles in the cleaning water flowing in a cleaning water flow passage, wherein a bubble-water mixture prepared by dispersing a large quantity of fine bubbles into cleaning water is discharged.

A ground source heat transfer system circulates transfer fluid between heat exchange units and a ground loop. The system includes a bypass which allows the transfer fluid to continue to circulate past the exchange units while bypassing the ground loop. Monitoring the conditions of the system with temperature sensors allows the system to selectively activate the bypass whenever diverting fluid away from the ground loop can save heat or energy.

The invention discloses an energy-saving control system for an air compressor group. The air compressor group is arranged in an air compressor room; a pipe network of the air compressor group consists of a main pipe network and a plurality of branch pipe networks; the main pipe network is communicated with a gas storage tank; the gas storage tank is positioned between the air compressor room and the branch pipe networks; each branch pipe network is correspondingly communicated with each air compressor of an air compressor unit through the main pipe network; a power supply lead of the air compressor unit is connected with an air compressor power distribution cabinet which is used for supplying power to a motor of each air compressor; the control system comprises a parameter monitoring module, an optimal control module and a display alarming module; the parameter monitoring module is used for monitoring parameters of the pipe network and the air compressor unit in real time and transmitting information to the optimal control module; the optimal control module is used for respectively controlling the air compressor unit and the display alarming module to work; and a manager acquires work information of the air compressor group through the display alarming module and correspondingly manages the pipe network and the air compressor unit. According to the energy-saving control system, comprehensive management for the whole air compressor system can be realized and the aim of maximizing energy saving is achieved.

The invention discloses a diffusion type brightened reflecting film and a backlight device. The diffusion type brightened reflecting film is provided with a reflecting base material layer, a brightened diffusion coating is arranged on one surface of the reflecting base material layer, and the other surface of the reflecting base material layer is provided with a bonding-preventing coating. The brightened diffusion coating includes organic particles with the particle size of 15-25 microns and the mass percent of 80-90 percent and organic particles with the particle size of 0.5-6 microns and the mass percent of 10-20 percent. The thickness of the brightened diffusion coating is 5 / 10-6 / 10 of the maximum diameter of diffusion particles. According to the diffusion type brightened reflecting film and the backlight device, the using of diffusion films can be reduced, the brightness of the backlight device is improved, when the diffusion type brightened reflecting film is applied to an LCD display, the using number of diaphragms can be reduced, and the energy-saving effect is achieved.

The invention relates to a lifting conveyor for articles packed in bags and boxes. The lifting conveyor comprises a bracket, a driving mechanism, a conveying mechanism and a transmission mechanism, wherein the driving mechanism is arranged on the bracket; the conveying mechanism is matched with the driving mechanism; the transmission mechanism is arranged between the driving mechanism and the conveying mechanism; the conveying mechanism comprises a first conveying gear and a second conveying gear which are arranged on the bracket, and a conveying chain which is located between the first conveying gear and the second conveying gear; at least one hopper bracket which moves following the conveying chain is arranged on the conveying chain; a rotating hopper which is rotatable is arranged on the hopper bracket; and a feeding conveying mechanism and a discharging conveying mechanism above the feeding conveying mechanism are arranged on one side of the bracket. The lifting conveyor provided by the invention can continuously run; PLC (Programmable Logic Controller) intelligent control is adopted; no manual intervention is required; the lifting conveyor is reasonable in structure, convenient in mounting and elegant in appearance; the plant space can be fully utilized; due to the PLC intelligent control, the energy consumption and the running cost are reduced; a huge benefit is brought to energy conservation, emission reduction and labor cost reduction; and the economic benefit of an enterprise is increased.

A method for preparing nanocrystalline magnesium alloy powder relates to the preparing method of magnesium alloy powder, which solves the problem that the machinery method prepares the powder with long time of ball milling, easy oxidation and low producing efficiency. In the fast solidify method for preparing the powder, only a very few magnesium alloy with exceptive alloy ingredient can obtain the nanocrystalline due to limit by thermodynamics condition. For most of magnesium alloy, crystal grain only can be refined to a range from 1 um to 3 um. The method of the invention is that magnesium alloy ingot is crushed to rough power, the rough power of the first step is put into a goal agate jar, the goal agate jar is vacuum and charged with hydrogen, the rough power is rub with machine in full hydrogen condition and the hydride state nanocrystalline magnesium alloy powder is dehydrogenated in vacuum by heating to get the nanocrystalline magnesium alloy powder material. The invention integrates the hydrogen processing and the machine goal agate method, therefore, the effect of crystal grain refinement is prominent and nanocrystalline is quickly obtained. The invention has the advantages of good thermal stability of hydride state powder, even organization and uneasy oxidation.

The invention provides a rapid carburizing heat treatment technology of a driving gear for an automobile differential mechanism. The rapid carburizing heat treatment technology comprises the following steps of 1, heating, 2, intensive carburization, 3, diffusion, 4, quenching, 5, cleaning and 6, tempering. According to the treatment technology, the carburizing period is obviously shortened, production efficiency is improved, the yield is increased, the energy-saving effect is achieved, the carburizing cost is obviously reduced, and economical benefits are significantly improved.

The invention provides an ultrahigh wear-resisting hydrogen sulfide-proof polyether-ether-ketone aqueous suspension specially used for oil-well tubes, which has extremely low VOC content. After beingcoated on the internal wall of the oil-well tube by a high-speed rotating airless spraying process, the suspension provides a coating layer with the performances of high wear resistance, self-lubrication, high-temperature and high-pressure resistance, hydrogen sulfide resistance and corrosion protection. The aqueous suspension can be sprayed by air and can be applied to various nut threads and various impellers so as to improve the chemical resistance and wear resistance of the equipment. The PEEK aqueous suspension has excellent self-lubrication, provides less surface resistance for the equipment and has excellent effect in reducing conveying resistance and saving energy.

The invention provides a preparation method of a sintering flux for iron ore sintering, which can solve the problem of waste recycling of converter slags, also can produce a low-cost sintering flux, and reduces the damages of converter slags on the environment. According to the invention, converter slags and air are fully reacted at a high temperature of 800-1100 DEG C, a main ingredient SFCA (complex calcium ferrite) in an obtained sintering flux product can reduce the melting point of the flux, so that the formation of a liquid phase in the process of sintering is facilitated, therefore, the energy consumption is reduced, conditions are provided for the improvement of the efficiency of a blast furnace, the maximum value of converter slags is utilized as much as possible, the recycling of metallurgical slags is implemented, and the energy conservation and emissions reduction of enterprises are facilitated. The preparation method of a sintering flux for iron ore sintering disclosed by the invention provides products and technical supports for the reduction of ironmaking and steelmaking production costs and the implementation of energy conservation and emission reduction.

The invention discloses a double-track tunnel based on reversible complementary ventilation. The double-track tunnel comprises an upstream tunnel, a downstream tunnel and a connecting air passage, wherein the connecting air passage is used for communicating the upstream tunnel and the downstream tunnel; a position, near the connecting air passage, of each tunnel is provided with a cross section expansion region extending to a position outside a driving building limit of the tunnel; an opening of the connecting air passage is positioned in the cross section expansion region; each cross section expansion region is provided with an air passage partition wall; the opening of the connecting air passage is separated into an air blowing opening and an air sucking opening by the air passage partition wall; an air blowing opening air valve is arranged at the air blowing opening; and an air sucking opening air valve is arranged at the air sucking opening. The air passage partition wall impedes or performs flow division on tunnel air flow flowing in the traffic flow direction, and the tunnel air flow is driven to change the flowing direction to enter the connecting air passage and is further transferred into the opposite tunnel, so that the ventilation effect between the two tunnels is effectively improved; the backflow ventilation effect is favorably improved through the air blowing opening air valve and the air sucking opening air valve; and the opening of the air passage partition wall and the opening of the connecting air passage are positioned in the corresponding cross section expansion region, so that the driving safety in the tunnels cannot be influenced.

The invention discloses an ultralow liquor ratio gas-liquid splitting dyeing machine with a built-in gas-liquid spray-dyeing system and a built-in cloth lifting system. The dyeing machine comprises a cylinder body, a main pump, a broken wool filter, a heat exchanger, a blower fan, dye liquor shunt tubes, an air duct, a strong current cabinet, a weak current cabinet, a cloth discharge device, a fabric inlet and outlet, a cloth lifting motor, a cloth lifting wheel, a nozzle, a cloth swing system, a cloth storage groove, a broken wool filtering device, a dye liquor return pipe, and other components. The dyeing machine is compact in structure and simple in operation, and occupation area of the device is greatly reduced, and labor intensity of manufacturing workers is reduced. The machine overturns a blower fan, liquor ratio, cloth swing and folding, fabric operation, dye liquor automatic filtering, and other concepts of an airflow atomizing fabric dyeing machine in the same generation. The device is characterized by low liquor ratio, water saving and electricity saving, reduced emission, high automation degree, high dyeing process efficiency, good quality, high stability, and safe and reliable operation. The dyeing machine is substantial in energy saving and emission reduction effect, and is environmentally friendly and low-carbon. The dyeing machine plays roles of demonstration and leading in a dyeing and finishing equipment industry, and leads development directions of the industry.

The invention discloses a corundum-zirconia corundum-titanic acid aluminum no-firing no-soaking sliding brick and a preparation method thereof. The sliding brick is composed of, by weight, 40-55 parts of tabular corundum, 15-25 parts of zirconia corundum, 10-15 parts of titanic acid aluminum, 6-10 parts of spherical calcined alumina, 5-8 parts of metal aluminum powder, 1-2 parts of high-temperature asphalt powder, 1-2 parts of silicon ash, 1-2 parts of antioxidants and 3-5 parts of phenolic resin. According to the corundum-zirconia corundum-titanic acid aluminum no-firing no-soaking sliding brick and the preparation method thereof, the raw materials of the tabular corundum, the zirconia corundum and the titanic acid aluminum are added into the formula, the coefficient of thermal expansion of the material of the sliding brick can be obviously decreased, and the thermal shock stability, the erosion resistance and the slag resistance of the sliding brick are improved; selection and adding amount of the high-temperature asphalt powder, spherical calcined alumina powder and the silicon ash are controlled, and the reasonable strength of the sliding brick in the low-temperature, medium-temperature and high-temperature stages can be achieved; the thermal expansion difference caused by the thermal stress of the temperature difference between inside and outside of the hole diameter of cast steel when the product is used is improved, the crack number is decreased; and the high-temperature comprehensive performance of the sliding brick is remarkably improved, and the service life of the sliding brick is prolonged.

The invention discloses a double-track tunnel provided with a vertical shaft smoke discharge and ventilation combined and complemented system. The double-track tunnel provided with the vertical shaft smoke discharge and ventilation combined and complemented system comprises two tunnel tracks, complementary contact air ducts and a smoke discharge vertical shaft, wherein the complementary contact air ducts and the smoke discharge vertical shaft are arranged between the two tunnel tracks. Axial flow fans are arranged in the contact air ducts and used for airflow organization between the two tunnel tracks. An axial flow fan is arranged in the smoke discharge vertical shaft. An air duct is formed in the bottom of the vertical shaft and communicates with an upper tunnel body and a lower tunnel body, and a pair of electric air valves is arranged in the air duct. The electric air valves in the air duct at the bottom of the vertical shaft are opened when no fire exists and used for natural ventilation. When a fire occurs, the electric air valve at the bottom of the portion, in the tunnel body on the no-fire side, of the vertical shaft and the air valves and the axial flow fans in the complementary contact air ducts are closed, and the axial flow fan in the smoke discharge vertical shaft is started for fire smoke discharge. According to the double-track tunnel provided with the vertical shaft smoke discharge and ventilation combined and complemented system, complementary ventilation is achieved through the contact air ducts, and thus the work amount of a ventilation system and a power supply and distribution system can be reduced; and the smoke discharge vertical shaft is used for smoke discharge when a fire occurs and natural ventilation when no fire exists, so that the corresponding vertical shaft scale and the project cost can be reduced, and the service energy-saving capacity and the disaster preventing capacity are improved.

The invention discloses a mixed vacuum pump system comprising a vacuum chamber, wherein the outlet of a gas cooling and dust removing device is divided into two paths; one path is communicated with a steam jet (and water ring) type vacuum pump system through a third gas suction pipeline and is provided with a second vacuum shutdown valve; the other path is communicated with a mechanical vacuum pump system through a second gas suction pipeline and is provided with a first vacuum shutdown valve; a second exhaust pipeline of the steam jet (and water ring) type vacuum pump system and a first exhaust pipeline of the mechanical vacuum pump system extend out of a workshop after being converged in front of a flowmeter and passing through a third exhaust pipeline; the first exhaust pipeline is provided with a first gas check valve; the second exhaust pipeline is provided with a second gas check valve. The steam jet (and water ring) type vacuum pump system is combined with the mechanical vacuum pump system in an external refining treatment process of molten steel, so that the requirement of an external refining process is sufficiently met, and meanwhile, the requirements for high efficiency and energy saving are met.