10results about How to "Increase pumping speed" patented technology

The invention provides application of high-molecular-weight cationic polyacrylamide in a titaniferous solution sedimentation process in a sulfuric acid method titanium dioxide process. The number-average molecular weight of the high-molecular-weight cationic polyacrylamide is greater than or equal to 10,000,000. The invention further provides a flocculating settling method for improving the titanium liquid settling effect in the sulfuric acid method titanium dioxide process. According to the method, cationic polyacrylamide is applied to the titanium dioxide titanium liquid sedimentation procedure through the sulfuric acid method, the preparation time of a flocculating agent can be shortened by more than half compared with that in the prior art, in the flocculation process, the concentration of dissociated ions is higher due to the high cationic degree, the adsorption effect on charges is higher, and the flocculation efficiency is improved. Particularly, the adsorbent has a relatively strong adsorption effect on a silicic acid component contained in the titanium liquid, so that the flocculating settling process is performed more quickly and thoroughly. By adopting the emulsion type high-ionic-degree high-molecular-weight cationic polyacrylamide, compared with the traditional flocculant product, the flocculating settling effect of the sulfate process titanium dioxide titanium liquid can be effectively improved, and the production cost is comprehensively reduced.

The invention provides a method for reducing the first-drop line breaking frequency of a single crystal furnace, and relates to the field of monocrystalline silicon production. The method comprises the following steps: S10, starting an auxiliary pump, and communicating the auxiliary pump with an auxiliary chamber of the single crystal furnace for vacuumizing operation; s20, after the pressure in the furnace body reaches the first set furnace pressure P1, communication between the auxiliary pump and the auxiliary chamber is cut off, and the auxiliary pump is closed; s30, starting a main pump, communicating the main pump with a main chamber of the single crystal furnace, and introducing protective gas; s40, the communication between the main pump and the main chamber is cut off, and the main pump is closed; according to the invention, impurity diffusion and residue can be reduced, so that the first-casting line breaking frequency of the single crystal furnace is reduced.

The invention relates to the technical field of physical fluid equipment, and discloses a magnetic suspension molecular pump structure and a magnetic suspension molecular pump, and the magnetic suspension molecular pump structure comprises a shell and a main shaft. The shell comprises an inner cavity, and the inner wall of the shell is sequentially provided with a dragging-stage stator and a regeneration-stage stator from top to bottom. The main shaft is rotationally arranged in the inner cavity through a bearing assembly, a dragging-stage rotor matched with the dragging-stage stator and a regeneration-stage rotor matched with the regeneration-stage stator are arranged on the main shaft, and the bearing assembly comprises a permanent magnet bearing arranged at the top of the main shaft and a mechanical bearing arranged at the bottom of the main shaft; a permanent magnet matched with the permanent magnet bearing is arranged at the top of the main shaft; and the dragging-stage rotor is a carbon fiber cylinder. Through the structure, friction, heating and load associated with the main shaft can be reduced, the rotating speed of the main shaft is improved to a great extent, and the pumping speed and the limit vacuum degree of the molecular pump are improved.

The utility model discloses a perforated plate inoculation instrument. The porous plate inoculation instrument comprises a rotary uniform mixing sample tube mechanism and an alternate uncovering mechanism, wherein the rotary uniform mixing sample tube mechanism comprises a fixed base plate, a support frame, a rotary fixed frame, a rotating wheel, a driving structure and a sample tube frame. According to the perforated plate inoculation instrument provided by the embodiment of the invention, the full-process automatic operation is realized by arranging the rotary uniform mixing sample tube mechanism and the alternate uncovering mechanism, and the rotary uniform mixing sample tube mechanism comprises the fixed base plate, the supporting frame, the rotary fixed frame, the rotating wheel, the driving structure and the sample tube frame; the driving structure can be used for driving the rotating wheel to rotate so that the fixing plate can turn over the sample tube frame, the rotating speed of the sample tube frame is increased, the uniform mixing treatment efficiency of sample tubes arranged on the sample tube frame is improved, the cover opening and liquid pumping speed is increased in cooperation with the alternate cover opening mechanism, and the inoculation efficiency is improved.

The present application relates to the technical field of turbo molecular pump, in particular to a kind of turbo molecular pump blade, turbo rotor and turbo molecular pump.Turbo molecular pump blade, the pressure surface and suction surface of blade body are both curved surface, the thickness of the blade body gradually decreases from root to top, the blade thickness of the blade body root is 3.5mm-4.5mm, the blade thickness of the blade body top is 1.5mm-2.5mm, the inlet angle of the blade body is 25°-35°, the outlet angle of the blade body is 40°-50°, the blade inclination of the blade body is 0°-20°.Design as smaller inlet angle and larger outlet angle, can improve the ability of capture, discharge and reverse to prevent backflow to the gas pumping capacity.In the case where other parameters are the same, it can improve the pumping speed and compression ratio of turbo molecular pump, can greatly improve the pumping capacity of turbo molecular pump under low pressure working condition.

This invention provides a vapor deposition reactor, comprising a furnace body, a container, a first inlet channel, an outlet channel, and a differential pressure regulating unit. The furnace body has a furnace cavity inside; the container is located in the furnace cavity and has a reaction chamber inside, while the furnace cavity outside the container forms a heating chamber; one end of the first inlet channel extends into the container and connects to the reaction chamber, and the other end is used to connect to an external reaction gas source; one end of the outlet channel connects the reaction chamber and the heating chamber, and the other end connects to the outside of the furnace body; the differential pressure regulating unit includes at least a first regulating unit, which is used to regulate the flow area of ​​the outlet channel.

The reversing valve comprises a valve body assembly and a valve element assembly, the valve body assembly comprises a valve element pipeline part, a feeding pipeline part and a pressure pump pipeline part, the rotating face of the valve element assembly abuts against a pipeline opening and a discharging opening of the pressure pump pipeline part, and the valve element assembly is provided with a material pumping channel and a discharging channel; the material pumping channel is provided with a first port and a second port, the feeding pipeline piece is provided with a linear feeding channel, and one end of the linear feeding channel is communicated with the material storage barrel; and in a material pumping state, the first port is communicated with a pipeline opening of the pressure pump pipeline piece, and the second port directly faces the other end of the linear feeding channel. Through the arrangement of the linear feeding channel, paint in the material storage barrel can directly flow into the valve element pipeline piece along the linear feeding channel, the problems of slow material pumping, large needed pumping force and the like caused by the fact that a paint flowing path is bent are solved, meanwhile, the second port directly faces the other end of the linear feeding channel, the paint can directly flow into the material pumping channel without hindrance, and the paint pumping efficiency is improved. And the material pumping speed is further improved.

The present invention relates to a double-helix dry screw vacuum pump, comprising a cylinder and a vacuum pump body, wherein the vacuum pump body is fixedly arranged inside the cylinder, a rotor and a gas channel are arranged inside the vacuum pump body, the rotor comprises an active rotor and a passive rotor, the active rotor is fixedly connected above the passive rotor, the rotor comprises a rotating shaft rod and a plurality of teeth, the teeth are embedded in the outer surface of the rotating shaft rod and fixedly connected, the plurality of teeth are arranged in the inner cavity of the vacuum pump body, the rotating shaft rod passes through the vacuum pump body, the gas channel is fixedly arranged in the gap between the two sides of the rotor and the vacuum pump body, the two ends of the vacuum pump body are respectively provided with an air intake port and an exhaust port, the exhaust port is fixedly provided with an exhaust channel outside the vacuum pump body, the exhaust channel passes through the bottom of the cylinder, the two sides of the cylinder are respectively provided with a front shell and a rear shell by buckles, the structure is compact, the pumping speed is large, and the vacuum degree is high.

The invention provides a symmetric molded line variable-pitch twin-screw rotor and a vacuum pump, and belongs to the technical field of vacuum pumps, the symmetric molded line variable-pitch twin-screw rotor comprises a driving rotor and a driven rotor which are meshed with each other, the pitch of the driving rotor and the driven rotor is reduced from the suction end to the exhaust end in the circumferential direction, and the end face molded lines of the driving rotor and the driven rotor are completely the same. Each of the four sections of curves sequentially comprises a tooth crest arc ab, a first section of epicycloid bc, a tooth bottom arc cd and a second section of epicycloid de, and the other four sections of curves and the four sections of curves are arranged in a central symmetry manner. By means of the design, it is ensured that the rotor is evenly stressed in the rotating process, vibration and noise generated by unbalanced stress are reduced, and the stability of the vacuum pump is remarkably improved; and meanwhile, a leakage triangle is omitted, so that the leakage triangle does not exist in the meshing process, the sealing performance is further improved, and gas leakage and energy loss are remarkably reduced.

The invention relates to the technical field of vacuum, in particular to a TiZrVAl alloy getter, a preparation method and a vacuum tube. The TiZrVAl alloy getter element provided by the invention is an integrally formed part prepared from the following metal powder in atomic percent: 25 to 35 percent of Ti, 25 to 35 percent of Zr, 25 to 35 percent of V and 10 to 25 percent of Al, and the total atomic percent is 100 percent; a porous air suction structure is arranged on the surface of the TiZrVAl alloy getter element. The getter element with the specific porous structure is prepared by introducing the Al element into the TiZrV alloy and combining the 3D printing technology, the activation temperature of the getter is remarkably reduced, meanwhile, the pumping speed and the suction capacity are greatly improved, and the service life is greatly prolonged.