177results about How to "Increase vacuum" patented technology

The invention discloses vacuum glass and a preparation method thereof. The preparation method comprises the following steps: grinding corners on one sides of the back surfaces of two glass sheets to form notches; tempering the two glass sheets, coating the outer edges of the back surfaces of the glass sheets with a first solder, and forming a notch; combining the two glass sheets; sealing the two glass sheets for the first time after the two glass sheets are combined; a getter is placed in the cavities of the two glass sheets through the notches in the sealing frame; sintering the second welding flux to form an inlaying piece and inserting the inlaying piece into the notch, wherein one end of the inlaying piece is arranged towards the cavity; elastic pressurizing devices are mounted on the two glass sheets, and the elastic pressurizing devices elastically abut against the other ends of the inlaying pieces; and sequentially carrying out vacuumizing and secondary sealing on the two glass sheets, so that vacuum is formed in the cavity, and the second welding flux is molten to seal the notch. The invention solves the problem that the solder at the vacuum lower edge part is easy to foam when being heated at high temperature in the existing vacuum glass preparation method.

The utility model discloses an integrated vacuum system which is characterized in that the integrated vacuum system comprises a box body, a first vacuum pump and a second vacuum pump, the first vacuum pump and the second vacuum pump are arranged in the box body, the top of the second vacuum pump is connected with the bottom of the first vacuum pump through a mounting plate, and two sides of the box body are respectively provided with a cross beam. Two sides of the first vacuum pump are respectively connected with the cross beam through supporting legs; a connecting port is formed in the mounting plate, and an air inlet in the top of the second vacuum pump is communicated with an air outlet in the bottom of the first vacuum pump through the connecting port. According to the utility model, the convenience of installation and debugging is improved, and the vacuum effect is also improved.

The utility model discloses a winding device for fabric production, and relates to the technical field of fabric winding, the winding device comprises a supporting base, one end of the supporting base is provided with a winding column, the winding device further comprises a dust removal conduction box, a dust collection assembly, a rotary driving rod, a first flapping assembly and a second flapping assembly, and the dust removal conduction box is connected to the supporting base; the number of the dust collection assemblies is two, and the rotary driving rods are rotationally arranged on the inner wall of the dust removal conduction box. The driving motor drives the rotating driving rod to rotate anticlockwise, the two ends of the rotating rotating driving rod act on the linkage transverse plates in the first beating assembly and the second beating assembly respectively, the linkage transverse plates drive the impact plates to be away from the textile cloth through the elastic sliding connecting pieces and then impact the textile cloth through resilience force, and the operation is repeated in this way, so that the textile cloth is flapped. And the textile cloth can be conveniently flapped, so that dust and impurities in deep layers of gaps of weaving lines of the textile cloth can be conveniently flapped and shaken out.

The invention relates to the technical field of cryopumps, in particular to a cryopump baking regeneration system, a baking method and a regeneration method.The cryopump baking regeneration system comprises a pump shell, a baking device, a refrigerating device, a nitrogen purging device and an air extractor, a pump cavity is formed in the pump shell, and a first-stage cold array and a second-stage cold array are arranged in the pump cavity; the baking device is arranged on the periphery of the pump shell and used for heating the pump cavity. The refrigerating device is connected with the first-stage cold array and the second-stage cold array and used for refrigerating the first-stage cold array and the second-stage cold array, so that the temperature of the first-stage cold array and the temperature of the second-stage cold array are lower than the preset temperature. The nitrogen purging device communicates with the pump cavity and is used for introducing hot nitrogen into the pump cavity; the air extractor is communicated with the pump cavity and is used for exhausting air in the pump cavity; through cooperation of the baking device and the refrigerating device, parts, except for refrigerating mechanisms with poor temperature resistance, such as a primary cold array and a secondary cold array, in the low-temperature pump can reach a high temperature, so that the low-temperature pump can discharge air more quickly and more thoroughly, and the low-temperature pump can reach a better vacuum degree.

The utility model relates to the field of heat treatment equipment. A metal electric heating element and at least two layers of metal reflecting screens are arranged in a furnace body, a vacuum system and an external water cooling system are further integrated in the furnace body, and the furnace body is further provided with a high-pressure air inlet for introducing high-pressure gas. A plurality of layers of metal reflecting screens are adopted in the hot area of the brazing furnace, so that the cleanliness of the hot area can be guaranteed while effective heat preservation and material cost reduction are achieved; a metal heating element is adopted, so that the cleanliness is kept on the premise of ensuring the uniformity of the temperature in the furnace; the vacuum system adopts two roots vacuum pumps, so that the exhaust capacity and the exhaust speed are increased, the exhaust time is shortened, and the working efficiency of the vacuum system is improved; the external water-cooling system solves the problem of overheating deformation through the water-cooling interlayer, the working efficiency of the brazing furnace is improved, the heat exchanger is convenient to clean and maintain, and the side water-cooling system is favorable for reducing the total height of equipment and is convenient to install in a plant with insufficient floor height.

The utility model relates to the technical field of door plate polishing, in particular to a door plate polishing machine which comprises a machine body, a polishing cavity arranged in the machine body, a polishing roller, a dust collection device, a conveying device, a dust collection structure, a driving structure and a pump body assembly. Wherein the dust collection structure is distributed in the grinding cavity; the dust collection structure can move in the polishing cavity in a reciprocating mode under the control of the driving structure, when the pump body assembly is started, the dust collection structure carries out air injection and dust collection, air injection is used for cleaning the door plate, dust collection is used for extracting impurities, and therefore dust collection work is completed.

The utility model provides a multistage variable-pitch screw vacuum pump with an adjustable compression ratio, taking two stages as an example, two parallel first-stage screws with equal pitch are arranged in a first-stage pump cavity, two parallel second-stage screws with equal pitch are arranged in a second-stage pump cavity, the pitch of the first-stage screws is larger than that of the second-stage screws, and the pitch of the second-stage screws is larger than that of the first-stage screws. A synchronous gear is installed on a shaft at one end of each first-stage screw rod and a shaft at one end of each second-stage screw rod, a variable gear is installed on a shaft at the other end of one first-stage screw rod, and the variable gear is located on the outer side of a bearing at the end. And a shaft at the other end of the second-stage screw positioned under the first-stage screw is also provided with a change gear. Through the adjustment of the change gear and the change of the screw pitch values of the upper and lower layers, the air suction and exhaust device is convenient to machine and install, the air suction and exhaust capacity is greatly improved, the working efficiency is high, the adjustment method is flexible, and the complex and changeable working conditions can be effectively coped with.

The utility model relates to a stirring device. The stirring device comprises: a stirring barrel for accommodating slurry; the stirring assembly comprises a dispersion disc arranged in the stirring barrel, and the dispersion disc can controllably rotate around the axis of the dispersion disc and revolve around a revolution axis; the self axis of the dispersion disc and the revolution axis are parallel and are not collinear; and the multiple turbulent flow strips are all arranged on the inner wall of the circumferential side of the stirring barrel in a protruding mode and distributed in the circumferential direction of the stirring barrel at intervals, and the circumferential direction of the stirring barrel is the direction around the revolution axis. Compared with the prior art, the stirring device avoids the need of driving the stirring barrel to rotate, on one hand, the sealing effect of the stirring barrel is improved, and the risk of slurry leakage is reduced; on the other hand, a relatively high vacuum degree can be kept in the stirring barrel, so that subsequent vacuum defoaming is facilitated; on the other hand, foreign matters generated by friction caused by relative sliding of the stirring barrel and the barrel cover are avoided, and slurry pollution is avoided.

The invention discloses a pure metal / high-entropy amorphous alloy nano multilayer film with a three-dimensional interface and a preparation method, and belongs to the field of metal surface modification.The nano multilayer film comprises crystal layers and amorphous layers which are alternately stacked, the crystal layers are of a single-phase face-centered cubic structure, crystal grains are columnar crystals growing in the deposition direction and penetrating through component layers, and the amorphous layers are of a single-phase face-centered cubic structure. The amorphous layer keeps a long-range disordered structure, and an interface between the crystal layer and the amorphous layer is of a three-dimensional structure; different from a two-dimensional sharp interface, a three-dimensional interface has certain strength, movement of dislocation in the area is subjected to stress, and then the current situation that dislocation completes slippage, namely annihilation, is changed. According to the preparation method, dislocation is orderly arranged near a three-dimensional interface, so that accumulation occurs, heterogeneous deformation stress is remarkably enhanced through long-range ordered dislocation arrangement, and the strength of the material is effectively improved.

The utility model discloses a vacuum chuck with high safety, which comprises a chuck, the surface of the chuck is fixedly communicated with a connecting pipe, the upper end of the connecting pipe is fixedly communicated with an air inlet structure, the side wall of the connecting pipe is fixedly communicated with a first branch pipe, and the first branch pipe is matched with a valve body structure and a second branch pipe for use. When the vacuum pump at the outer side end works, the valve body can be effectively drawn and opened, at the moment, air in the first branch pipe and the second branch pipe can be pumped out, air on the inner wall of the connecting pipe is also pumped out, the air pressure in the system is reduced, the vacuum degree is increased, and a workpiece at the outer side end of the suction cup can be firmly adsorbed; at the moment, under the action of the valve body structure, the pipeline can be closed quickly, air cannot enter the pipeline, the vacuum degree is prevented from being reduced, workpieces are prevented from falling off, the safety of equipment in response to emergency situations during use can be guaranteed, and practicability is high.

The utility model discloses an air suction device, a vacuum insulation panel and refrigeration equipment, and relates to the technical field of electrical equipment, and the air suction device comprises a shell, an air suction material and a sealing piece. The shell comprises a base and a cover body covering the base; the air suction material is arranged in the shell; the sealing piece is arranged at the joint of the base and the cover body, and the sealing piece can be broken under the extrusion effect to form a gap at the joint of the base and the cover body, so that gas outside the shell can enter the shell to be in contact with the gas suction material. Due to the fact that the sealing piece is arranged at the connecting position of the base and the cover body, due to the characteristic that the sealing piece is broken under the extrusion effect, the sealing piece can be broken by extruding the shell, a gap is formed in the connecting position of the base and the cover body, and gas and water outside the shell can enter the shell through the gap to be absorbed by the gas absorption material. The vacuum degree in the vacuum insulation panel can be improved, and the heat insulation performance of the vacuum insulation panel is enhanced.

The present invention discloses a device for suppressing background radiation of a medium- and long-wave infrared hyperspectral remote sensor, comprising a first refrigerator assembly, a second refrigerator assembly and a cold box assembly, wherein the first refrigerator assembly and the second refrigerator assembly are respectively connected to the cold box assembly, a spectrometer assembly is arranged inside the cold box assembly, the spectrometer assembly comprises a first spectrometer, a second spectrometer and a third spectrometer, the first refrigerator assembly is respectively connected to the first spectrometer and the second spectrometer through a flexible cold chain, the second refrigerator assembly is connected to the third spectrometer through a flexible cold chain, a window mounting base is arranged on the cold box assembly, and the first spectrometer, the second spectrometer and the third spectrometer are arranged around the window mounting base. The present invention adopts a two-stage refrigeration method for refrigeration, effectively avoids the problem of long startup time of the refrigerator, ensures vacuum deep low temperature refrigeration, and effectively realizes background radiation suppression of the medium- and long-wave infrared hyperspectral remote sensor.

The utility model discloses an aquatic product premix dust recovery device which comprises a device body, and a mixing box used for mixing aquatic product premix is fixedly installed on the device body. Racks are fixedly installed at the two ends of the top of the device body, a transverse frame is fixedly installed at the tops of the two racks, a dust suction hood is movably installed below the transverse frame, a dust collector is fixedly connected to the dust suction hood through a dust suction hose, and the dust collector is fixedly installed at the right end of the top of the transverse frame. The top of the dust suction hood is fixedly connected with a second movable block through two movable frames, and the second movable block is movably arranged at the bottom of the transverse frame. According to the dust collection device, dust generated in premix can be conveniently collected and recycled, the dust collection cover can be made to collect dust in the left-right moving process, the dust collection range can be expanded, it is ensured that dust generated in the aquatic product premix process is better collected, the overall dust collection effect is better, and the dust collection efficiency is improved. And the influence of dust on the human body and the environment is greatly reduced.

The utility model relates to a raw material drying device for vegetable seasoning packet processing, which comprises a conical roller, a shaft support, a discharging sealing sleeve and a feeding base, a spiral blade is fixedly arranged in the conical roller, the shaft support and the conical roller are coaxially arranged and hermetically connected, a plurality of microwave transmitting components are arranged on the shaft support, and the feeding base is arranged on the shaft support. A vacuumizing pipe is arranged on the shaft support in a penetrating mode to vacuumize the interior of the conical roller, and the discharging sealing sleeve is used for sealing the discharging end. The device is good in sealing performance, can continuously work under the condition of keeping a certain vacuum degree, and is high in microwave utilization rate; due to the fact that the interior of the conical roller has high vacuum degree, the boiling point of water is low, water gasification is extremely fast, but the vacuum degree has no large influence on microwaves, and the device has high drying efficiency.

The invention discloses a cationic dye dyeable regenerated polyester fiber and a preparation method thereof, and relates to the technical field of polyester fibers, the cationic dye dyeable regenerated polyester fiber comprises the following components: waste polyester, sodium bis (2-hydroxyethyl) isophthalate-5-sulfonate and long-chain dihydric alcohol, the method comprises the following steps: mixing waste polyester, sodium bis (hydroxyethyl) isophthalate-5-sulfonate and long-chain dihydric alcohol according to a certain mass ratio, extruding the mixture in a twin-screw extruder, carrying out semi-depolymerization on the waste polyester by using the sodium bis (hydroxyethyl) isophthalate-5-sulfonate and the long-chain dihydric alcohol to obtain a semi-depolymerization product which is low-molecular-weight polyester with a hydroxyl-terminated structure, feeding the low-molecular-weight polyester into a polycondensation reactor, and carrying out condensation polymerization on the low-molecular-weight polyester with the hydroxyl-terminated structure to obtain the low-molecular-weight polyester with the hydroxyl-terminated structure. The prepared modified polyester can be directly spun or spun after being diced, and the prepared polyester fiber has a cationic dye normal-pressure dyeable effect, can remarkably reduce dyeing energy consumption and material consumption, has good hygroscopicity, improves wearing comfort and can be widely applied to the fields of clothes, home textiles and the like.

The present disclosure relates to a fluid storage and transportation structure, comprising: an inner cylinder for storing and transporting fluid; an outer cylinder which is spacedly sleeved outside the inner cylinder, a heat insulation gap is formed between the inner cylinder and the outer cylinder, the outer cylinder is provided with a gas suction port which is communicated with the heat insulation gap; a storage box is installed in the heat insulation gap; a gas adsorbent is arranged in the storage box, the storage box is configured to selectively communicate the gas adsorbent with an external space of the storage box, so that the gas adsorbent can absorb the gas in the heat insulation gap. When the heat insulation gap is vacuumized, when the vacuum degree of the heat insulation gap approaches but does not reach the preset requirement, the vacuumization is stopped, the storage box is controlled to communicate the gas adsorbent with the external space of the storage box, so that the residual gas in the heat insulation gap can be adsorbed, so as to further improve the vacuum degree of the heat insulation gap to reach the preset requirement, effectively reducing the time and energy consumption of the vacuumization.

The utility model discloses high-strength refractory material pouring forming equipment which comprises a shell, a lower die is fixedly connected to the middle axis of the top of the shell, a sealing plate is arranged at the bottom of the inner wall of the lower die, rectangular plates are fixedly connected to the two sides of the bottom of the sealing plate, and connecting plates are fixedly connected to the bottoms of the rectangular plates. The bottom of the left side of the shell communicates with a one-way valve. Through the arrangement of the shell, the lower mold, the sealing plate, the rectangular plate, the connecting plate, the spring, the sliding rod, the air pump, the one-way valve, the fan and the spray head, the auxiliary demolding work can be carried out, the auxiliary cooling effect can be achieved, the material forming speed is high, and therefore work is efficient; by arranging the fixing frame, the electric telescopic rod, the upper mold, the box body, the vacuum pump, the motor, the lead screw and the inserting plate, the mold cavity can be vacuumized conveniently, the situation that the whole mold cavity cannot be filled with materials due to residual air in the mold cavity is avoided, and the material forming effect is good.

The utility model relates to the technical field of crystallization equipment, and discloses a solid waste leachate low-temperature crystallization device, which comprises a crystallization chamber, a condensation heat exchange chamber, a compressor, a vacuum pump and a circulating pipe, the top of the crystallization chamber is communicated with the bottom of the condensation heat exchange chamber, the condensation heat exchange chamber is communicated with the vacuum pump, and the vacuum pump is used for keeping vacuum states in the crystallization chamber and the condensation heat exchange chamber. A heat exchanger is arranged at the top in the condensation heat exchange chamber, a condensation water tank is arranged at the bottom in the condensation heat exchange chamber, and an outlet of the heat exchanger is sequentially communicated with the compressor, the crystallization chamber and an inlet of the heat exchanger through circulating pipes. The utility model has the advantages of low energy consumption, stable and safe operation, and good market prospect.

The application discloses a strip type NEG (Non Evaporable Getter) pump for a particle accelerator and a use method thereof. The pump comprises a getter assembly, a fixing part, a vacuum flange and an electrode. One end of the getter assembly is provided with the fixing part, the fixing part is fixedly connected with one side of the vacuum flange, the other side of the vacuum flange is provided with the electrode, and the getter assembly is electrically connected with the electrode. The getter assembly comprises two or more getter strips, each getter strip is arranged side by side and fixedly connected with the fixing part at one end, and a gap is reserved between two adjacent getter strips. The use method is that the strip type NEG pump is inserted into a vacuum chamber along the axial direction of the vacuum chamber and then fixedly installed, each getter strip is parallel to the axis of the vacuum chamber, the vacuum flange is fixedly installed with the side wall of the vacuum chamber, and the electrode is externally connected with a power supply device. The application can effectively improve the uniformity of vacuum distribution, maintain a high vacuum degree, avoid misfiring of a beam, has a simple structure, is convenient to install, and can be adapted to the installation requirements of the accelerator vacuum chamber in a large range.

The invention discloses a dust collector floor brush with a rear scraping strip. The dust collector floor brush comprises a floor brush body, a rolling brush is arranged in the floor brush body, a mounting hole is formed in the floor brush body, and the mounting hole is located behind the rolling brush; the scraping strip is rotationally connected to the floor brush main body, and the scraping strip is located in the mounting hole; the driving assembly comprises a driving part, a connecting rod and a detecting part, the detecting part is used for detecting rotation information of the large wheel, the detecting part is connected with the driving part, one end of the connecting rod is connected with the driving part, and the other end of the connecting rod is connected with the scraping strip. Compared with the prior art, the problems that the floor brush is not easy to move when the floor brush is pushed backwards due to the fact that the scraping strip on the floor brush of the dust collector cannot be collected, and particles are blocked and taken away by the scraping strip and cannot be sucked into the dust collector when the floor brush is pulled backwards can be solved, so that the cleaning efficiency of the dust collector can be improved.

The utility model relates to a large-cavity vacuum pump set system which comprises a cavity, a rough vacuumizing pump set, a fine vacuumizing pump set, a pipeline set, a switch valve set, a pressure sensor and a control device, the pressure sensor is arranged on the cavity, and the rough vacuumizing pump set and the fine vacuumizing pump set are both connected and communicated with the cavity through the pipeline set. A switch valve group is arranged between the rough vacuumizing pump unit and the cavity, the control device is electrically connected to the pressure sensor, the rough vacuumizing pump unit, the fine vacuumizing pump unit and the switch valve group, and the control device controls opening and closing of the rough vacuumizing pump unit, the fine vacuumizing pump unit and the switch valve group according to data of the pressure sensor. Through matching and combination of pump sets in different forms, the working efficiency is improved, and the performance of the vacuum pump is utilized to the maximum extent, so that the pump sets stably operate in different pressure sections; the controller controls unit operation in different stages through data of the pressure sensor, so that the unit operation is optimal, the process pressure requirement is met, and energy saving is achieved.

The present invention discloses a liquid helium dewar for maintaining high vacuum, the liquid helium dewar comprises a vacuum outer cavity, a liquid helium cavity and a liquid helium diameter tube; a vacuum electrical connector and a vacuum port are arranged on the outer surface of the vacuum outer cavity, the vacuum electrical connector extends to the vacuum interlayer, and the vacuum port is connected to the vacuum interlayer; at least one suction device is arranged on the inner surface of the vacuum outer cavity, and the suction device is electrically connected to the vacuum electrical connector; at least one adsorption device is arranged on the outer surface of the liquid helium cavity, an adsorption medium is built in the adsorption device, and the adsorption device is provided with a heating device, and the heating device is electrically connected to the vacuum electrical connector. In the embodiment of the present invention, the liquid helium dewar can maintain a high vacuum for a long time, can achieve a good insulation effect, can maintain a low volatility for a long time, and has good practicality.

This utility model relates to the field of vacuum pump technology and discloses a vacuum pump assembly, including a housing, a first vacuum pump and a second vacuum pump arranged inside the housing, the second vacuum pump being located directly below the first vacuum pump, the inlet end of the first vacuum pump passing through the housing and communicating with the outside, the outlet end of the first vacuum pump being connected to the inlet end of the second vacuum pump, and also including a silencing unit, the silencing unit being attached inside the housing and located directly below the second vacuum pump, one end of the silencing unit being connected to the outlet end of the second vacuum pump, and the other end communicating with the outside. This utility model, with the first vacuum pump, the second vacuum pump, and the silencing unit sequentially located directly above their respective units, has a compact structure and improves space utilization.

The utility model provides a flexible freezing catheter vacuumizing pipe cavity switching structure which comprises a first cavity, a second cavity, a first connecting pipe, a second connecting pipe, a second connecting pipe and a third cavity, the far end of the first cavity is communicated with a first pipeline, and the near end of the first cavity is communicated with a second pipeline; the far end of the second chamber is communicated with the third pipeline, and the near end of the second chamber is communicated with the fourth pipeline; the fifth pipeline penetrates through the first chamber and the second chamber, and the fifth pipeline comprises a first end part and a second end part; the first end parts of the first pipeline, the third pipeline and the fifth pipeline are sequentially sleeved from outside to inside along the radial direction, and the second end parts of the second pipeline, the fourth pipeline and the fifth pipeline are mutually independent. According to the flexible freezing conduit vacuumizing pipe cavity switching structure, the concentric structure formed by sequentially sleeving the first ends of the first pipeline, the third pipeline and the fifth pipeline in the radial direction from outside to inside is converted into the parallel tubular structure, so that all gas paths are separated and do not interfere with one another, and the high vacuum degree can be formed.

The invention discloses a superconducting cavity niobium-plated three-tin film vacuum evaporation furnace. Wherein the outer vacuum system is communicated with the furnace body and provides a vacuum environment for the hearth; the inner vacuum system is communicated with the superconducting cavity coating chamber, and the inner vacuum system provides a vacuum environment for Ni3Sn coating; a gas interface is arranged between the furnace body and the superconducting cavity coating chamber; the furnace body power regulator is divided into a front furnace door heating area, a rear furnace door heating area, a coating area left heating area and a coating area right heating area of the furnace body for heating and temperature control; in a coating area in the superconducting cavity coating chamber, superconducting cavity thermocouples are installed on six dimensions of the front side, the rear side, the upper side and the lower side through superconducting cavity supports respectively, and the superconducting cavity thermocouples and tin source thermocouples are connected with a temperature control monitoring system. And the temperature control monitoring system and the furnace body power regulator form a coating chamber temperature control system to control and balance the temperature in the superconducting cavity coating chamber. And the temperature deviation of the uniform temperature zone is less than or equal to + / -3 DEG C, so that the equipment meets the requirements of industrial operation stability and reliability.

The utility model discloses a kind of PCB board mounting mechanisms, including carrier and jig, carrier includes carrier main body and magnetic attraction component, carrier main body is equipped with cavity, built-in magnetic attraction component is locked PCB board by magnetic force, carrier is placed between jig and PCB board, jig main body is with guide rail, several adsorption components movable thereon, PCB board is fixed by negative pressure adsorption.The utility model is locked by magnetic attraction piece on the carrier main body and the magnetic piece on PCB board, to ensure that carrier and PCB board are stably connected, jig main body is equipped with guide rail, and the adsorption component movable thereon is fixed by negative pressure adsorption, the vacuum degree of vacuum lifting is improved by small area contact of suction nozzle, cooperate with the magnetic attraction positioning of carrier, so that PCB board keeps stable position in mounting process, avoids deviation, simplifies operation process, improves mounting precision and production efficiency, especially suitable for high-precision assembly demand in custom LED display product automated production line.

A radio frequency antenna installed in an ultra-high vacuum chamber includes an upper and lower interface flange module, a connecting straight wire module, and an open multi-segment quasi-circular arc antenna module. The upper and lower interface flange modules are used to ensure vacuum sealing; the connecting straight wire module is used to transmit excitation signals and impedance matching; the open multi-segment quasi-circular arc antenna module is used to provide three-segment elliptical arc antennas with an eccentricity of approximately 1. The entire antenna has an ultra-wide impedance bandwidth from DC to 127MHz, and can radiate an effective radio frequency signal with a polarization degree of 0.9987 and a signal strength of 53.6mG in the atomic interaction region under a low feed power of 3W. The present invention can not only reduce the radio frequency power demand by 90%, but also maintain the system vacuum degree better than 2.1×10 ‑8 Pa, and has good electromagnetic compatibility. The present invention is applied to a space ultracold atomic physics experimental device, and can provide a radio frequency antenna installed in an ultrahigh vacuum chamber for experiments of radio frequency induced evaporative cooling and radio frequency state preparation.

This application belongs to the technical field of cooling equipment, and particularly relates to a device for improving the power generation efficiency of a waste heat generator set by cooling. The device includes a condenser, an inlet water pipe at the condenser's inlet, a cooling pipe on the inlet water pipe, at least one heat exchange component on the cooling pipe, and a ventilation cooling system or a liquid cooling system on the outside of the cooling pipe. The ventilation cooling system or liquid cooling system works in conjunction with the cooling pipe to lower the temperature inside the cooling pipe. This application, by installing a cooling pipe on the inlet water pipe and dissipating heat from the cooling pipe, lowers the temperature of the circulating water flowing through the cooling pipe, thereby increasing the vacuum degree of the condenser and thus improving the power generation efficiency and output of the waste heat generator set.

The utility model discloses a vacuum machine which comprises a base assembly and an upper cover assembly, the edge of the rear end of the base assembly is provided with a plurality of rotating grooves distributed in the left-right direction, the edge of the rear end of the upper cover assembly is provided with a plurality of rotating blocks distributed in the left-right direction, and the rotating grooves are matched with the rotating blocks in a rotating mode respectively. The top wall of the base assembly and the bottom wall of the upper cover assembly can be closed so as to conduct vacuumizing and heat sealing on a vacuum bag. Locking blocks protruding upwards are arranged at the left end and the right end of the top wall of the base assembly respectively, locking grooves are formed in the opposite sides of the locking blocks at the left end and the right end respectively, through holes are formed in the left end and the right end of the bottom wall of the upper cover assembly respectively, and lock catches are arranged at the left end and the right end of the interior of the upper cover assembly respectively; the lock catches at the left end and the right end are located above the through holes in the left end and the right end respectively. The lock catch is reasonable in structural design, the structure that the lock catch is matched with the lock groove in a locking mode is simple and efficient, and production cost is low.

The application discloses a low-temperature oil-free centrifugal compressor placed in an adiabatic environment, comprising an adiabatic cold box, a centrifugal compressor unit, connecting pipelines and a vacuum pump. The centrifugal compressor is placed in the adiabatic cold box and comprises a motor, an impeller, a volute and a bearing. The impeller and the motor at two ends of the centrifugal compressor are placed in different chambers of the adiabatic cold box. The centrifugal compressor can adopt the same rotor structure at two ends. The motor does not need to be cooled. The centrifugal compressor is provided with a motor heat preservation loop. The bearing adopts a gas bearing or a gas-magnetic hybrid bearing, and the gas bearing type is full dynamic pressure, dynamic-static pressure or full static pressure. The low-temperature oil-free centrifugal compressor placed in the adiabatic environment can greatly reduce the power consumption and cold leakage loss of the compressor. The compressor with the same structure at two sides does not need to consider the axial force. Through the measures of setting different adiabatic chambers and heat preservation loops, the compressor can operate at an import temperature of -268 to -20 DEG C. The low-temperature centrifugal compressor is purely oil-free, and the system volume and weight are greatly reduced.