658results about How to "Pressure balance" patented technology

A turbine bucket includes a bucket airfoil having a tip shroud with leading and trailing edges defining leading and trailing edge profiles substantially in accordance with Cartesian coordinate values of X and Y at points 12-20 and 1-11, respectively, set forth in Table I. The X and Y values are distances in inches which, when respective points 12-20 and 1-11 are connected by smooth, continuing arcs, define the leading and trailing edge tip shroud profiles. An airfoil profile at 95% span is defined by Cartesian coordinate values of X, Y and Z in Table II having the same X, Y origin along the radial Z axis as the origin of Table I. The profiled leading and trailing edges of the tip shroud relative to the airfoil profile afford optimum tip shroud mass distribution which maximizes creep life of the bucket. Stage efficiency is also improved by providing a tip shroud covering the airfoil throat.

This invention provides a resid cracking apparatus comprising a riser, reactor, stripper cum separator with adjustable outlets in flow communication with adsorbent and catalyst regenerators for converting hydrocarbon residues containing higher concentration of conradson carbon content, poisonous metals such as nickel & vanadium and basic nitrogen etc., into lighter and valuable products and a process thereof.

Disclosed is an automation control method for tunnel lining construction. A control system integrates all information collecting and control procedures of a traveling mechanism, a hydraulic system, aconcrete distribution device, a vibrating device, a temperature sensor, a flowmeter, a video monitor and a pressure sensor, is equipped with a GPRS wireless data transmission module, and can collect and upload information in the casting process of a tunnel lining to a project department monitoring room. The distribution device can be connected with a plurality of distribution pipes in series, thetemperature sensor is used for detecting the concrete casting temperature, and the flowmeter is used for collecting the concrete casting quantity and implementing automatic control over casting. The video monitor monitors real-time work picture information, and collects and transmits the real-time work picture information to the project department monitoring room. The vibrating device achieves vibrating automatic control operation for concrete. The pressure sensor detects and collects pressures of all points in the concrete casting process and displays the casted height of the concrete. The control system conducts concentration analysis on data collected in the casting process of the tunnel lining, gives out a control instruction, and uploads the detected data to the project department monitoring room.

A fastening structure for dissipation device has a metal plate with at least one screw hole, a screw with an engagement part, an elastic element, and a screw cap. The screw and the elastic apparatus are assembled in the screw hole. The screw cap, whose clamp structures are fastened to the outside of the screw hole, limits movement of the screw and the elastic element in the screw hole. The screw is allowed to move upward and downward within a predetermined scope.

The present invention relates to anti-pollution high efficiency isolating liquid for shaft wall cementing operation and its preparation process. The isolating liquid is compounded through adding suspension stabilizer, water reducing agent, tackifier, diluent, viscosity and shearing force increasing agent, weight additive and pH regulator in certain weight proportion into water. One compounding process is a water base process through throwing the said components successively into water in a slurry tank apparatus. One other compounding process is one dry mixture process in a cementing tank apparatus. The isolating liquid has flexible compounding process, high anti-pollution capacity and effective eliminating effect on well wall interface pollutant.

This invention provides a resid cracking apparatus comprising a riser, reactor, stripper cum separator with adjustable outlets in flow communication with adsorbent and catalyst regenerators for converting hydrocarbon residues containing higher concentration of conradson carbon content, poisonous metals such as nickel & vanadium and basic nitrogen etc., into lighter and valuable products and a process thereof.

A radiator, adopted on electronic devices with radiator fans installed in series, includes a case, two or more radiator fans and a membrane check valve. The radiator fans are located on the inner wall surface of the case. The membrane check valve has a frame, at least one bracing bracket and membrane petals. The frame is located between the radiator fan and the inner wall surface of the case. The bracing bracket is located in the frame to form a plurality of cells with the frame. The membrane petals' one end attaches to one side of the frame and is more directed towards air outlets of the radiator fans than the bracing bracket. When any radiator fans stops operation, air inside the electronic devices flow outwards in the positive direction to balance the pressure and prevent heat dissipation efficiency of the electronic devices from dropping excessively.

The invention discloses a ground control method for underground sliding sleeves. The ground control method comprises the steps as follows: a ground electromagnetic wave emitting device generates command information for controlling opening or closing of a plurality of underground sliding sleeves according to input control commands, and the command information is sent to the underground sliding sleeves after amplification; an electromagnetic wave receiving device arranged in each underground sliding sleeve receives the command information sent from the ground, and the command information is compared with respective pre-assigned control commands; if the command information is not consistent with the assigned control commands of the underground sliding sleeves, the underground sliding sleeves which are not consistent with the command information do not act and continuously wait for next ground command information; and if the command information is consistent with the assigned control command of one underground sliding sleeve, the underground sliding sleeve acts and finishes opening or closing operation required by the command information. According to the ground control method for the underground sliding sleeves, opening and closing actions of the underground sliding sleeves can be remotely controlled by the ground electromagnetic wave signals and can be controlled in real time, and further, ball pitching is not required.

The invention discloses a LeakView leakage control and management system for an urban water supply pipe network. The control and management system comprises a partitioned management system, a leakage noise online monitoring system and a water hammer early warning and monitoring system, the partitioned management system makes the water supply pipe network to form a partitioned management mode from the factory-leaving water yield, first-level partition, second-level partition, DMA to user terminal multi-level water units, all the water units are scientifically managed through a water balance test, a pressure control strategy with the optimal water saving effect and the optimal economic matching performance is made through a response mechanism of the leakage of the water supply pipe network to the pressure, leakage noise is monitored on line by using terminal noise monitoring equipment instead of leakage detection by manual listening, the noise is displayed in the form of data, a region where the leakage is suspected to exist is found through comparative analysis of the key data, the water hammer early warning and monitoring system adopts a transient flow pressure fluctuation situation of a network system to be combined with a big data technology, and therefore the rapid change of the pressure of the pipe network system can be monitored on line, an alarm for the abnormal pressure change situation can be given in real time, on-line early warning can be realized, the data can be deeply excavated and analyzed, and water hammer protection can be made.

The invention relates to an overall process under-balance drilling pressure compensation system and a method for oil and gas drilling, an underground casing valve (10) is connected on a superior casing string, a wellhead rotary blowout preventer (11) is arranged at an upper end of a wellhead blowout preventer group and is connected with an under-balance throttle manifold (8) through a high-pressure hose (9), a well control manifold (12) which is connected out of a normal wellhead control device by four-pass is connected with a drilling fluid continuous pouring system in parallel by two-pass; and drilling is pulled to the front of the underground casing valve (10), the drilling fluid continuous pouring system grouts, the under-balance throttle manifold (8) controls the pressure in a shaft, and the drilling fluid which is circulated out enters a normal drilling fluid circulating system. In the drilling pulling process, the drilling fluid can be continuously poured into the shaft by a ground pressure compensation system and the bottom-hole pressure can be dynamically controlled simultaneously, thus effectively preventing formation fluid from intruding into the shaft in the drilling pulling process and keeping the steady under-balance state of the shaft.

The invention relates to a large water electrolysis hydrogen production system with wide power fluctuation adaptability and a control method. The system comprises: a plurality of water electrolysis hydrogen production module groups which are arranged in parallel; a system power division controller, which is configured to be used for power distribution and control of the water electrolysis hydrogenproduction module groups in the water electrolysis hydrogen production system; each water electrolysis hydrogen production module group comprises a plurality of water electrolysis hydrogen productionmodules with different power levels and a module power division controller, the module power division controller is configured to be used for power diversion control of a water electrolysis hydrogenproduction module in the module group. The module power division controller is connected to the system power division controller, and the water electrolysis hydrogen production modules in the water electrolysis hydrogen production module groups share one module manager used for temperature, alkali liquor circulation and gas-liquid separation control and a hydrogen purification assembly used for hydrogen purification. Compared with the prior art, the hydrogen production energy consumption efficiency and wide power fluctuation adaptability can be improved, the instantaneous response speed is increased, and the power loading cost is reduced.

A turbine bucket includes a bucket airfoil having a tip shroud with leading and trailing edges defining leading and trailing edge profiles substantially in accordance with Cartesian coordinate values of X and Y at points 12-20 and 1-11, respectively, set forth in Table I. The X and Y values are distances in inches which, when respective points 12-20 and 1-11 are connected by smooth, continuing arcs, define the leading and trailing edge tip shroud profiles. An airfoil profile at 95% span is defined by Cartesian coordinate values of X, Y and Z in Table II having the same X, Y origin along the radial Z axis as the origin of Table I. The profiled leading and trailing edges of the tip shroud relative to the airfoil profile afford optimum tip shroud mass distribution which maximizes creep life of the bucket. Stage efficiency is also improved by providing a tip shroud covering the airfoil throat.

The invention relates to a lithium ion power battery box, which comprises a battery box body for alternately arranging batteries inside the body along a set arrangement direction, and a base air channel arranged in the battery box body, wherein the flow direction of the base air channel is consistent with the set arrangement direction; the battery box is also provided with a reinforced cooling air channel for delivering cooling air separated from the base air channel; the reinforced cooling air channel is provided with jet holes for directing the cooling air into a set cooling area in the battery box body; and the cooling area is a gap between front and back adjacent batteries along the battery arrangement direction in set positions or batteries in the set positions. By adopting the lithium ion power battery box, the problem in the prior art that cooling capacity distribution in various parts in the battery box body is non-uniform because the batteries are successively cooled along a single base air channel is solved; and the lithium ion power battery box of the invention can uniformly cool the batteries and improve the overall discharge performance and the service life of the batteries in the battery box.

The invention discloses a microchannel-based cylindrical power battery thermal management device. The microchannel-based cylindrical power battery thermal management device comprises a battery pack, a circulating pump, a heat exchanger, an upper liquid storage box and a lower liquid storage box; the upper liquid storage box is arranged on the upper head face of the battery pack; a general cooling liquid outlet is formed in the upper liquid storage box; the lower liquid storage box is arranged on the lower head face of the battery pack; a general cooling liquid inlet is formed in the lower liquid storage box; the general cooling liquid inlet is connected with one end of the circulating pump; the other end of the circulating pump is connected with one end of the heat exchanger; the other end of the heat exchanger is connected with the general cooling liquid outlet; and therefore, a cooling circulating system is formed. According to the invention, the temperature control and liquid leakage problems of the power battery in severe environments and under extreme working conditions are solved.

This invention provides a resid cracking apparatus comprising a riser, reactor, stripper cum separator with adjustable outlets in flow communication with adsorbent and catalyst regenerators for converting hydrocarbon residues containing higher concentration of conradson carbon content, poisonous metals such as nickel & vanadium and basic nitrogen etc., into lighter and valuable products and a process thereof.

An anti-rotation mounting mechanism is provided between an indexable insert and an insert-receiving pocket in the body of a machine tool, such as a milling cutter. The mechanism includes a plurality of curved stop surfaces uniformly disposed around the side surface of the insert, a portion of which is obliquely oriented with respect to the side surface of the insert, and an anti-rotation feature in the pocket of the tool body having a pair of engagement portions that are substantially complementary in shape to that of the stop surfaces for forming an interference joint between the pocket and the insert. The anti-rotation feature further includes a central planar portion that does not engage the stop surfaces. The mechanism effectively prevents rotation between the insert and pocket without the formation of point-type, localized stresses which can chip or break the insert.

The invention discloses an emulsifying and flushing spacer fluid for improving the cementing quality of an oil-based drilling fluid and a preparation method of the emulsifying and flushing spacer fluid. The spacer fluid is prepared from the following components in parts by weight: 200 parts of water, 5-10 parts of a surfactant, 70-75 parts of base oil, 4-15 parts of a suspension stabilizer, 0.2-3.0 parts of a fluid loss agent, 0.2-2.0 parts of a tackifier, 0.2-5.0 parts of a diluent, 80-400 parts of a weighting agent and 0.05 part of a defoamer, wherein the surfactant is prepared from cocoanut fatty acid diethanolamide CDEA and alkyl glycoside APG in a weight ratio of 1: 2. The emulsifying and flushing spacer fluid which has an emulsifying structure with permeating, dissolving, volume-increasing, carrying functions and the like has a preferable flushing capacity to the oil-based drilling fluid and mud cakes adhered to a casing wall. The surfacant molecules in the spacer fluid can be adsorbed on the surfaces of a casing and a well wall to improve the interfacial wettability, so that cement slurry and the casing and the well wall are better contacted and cemented, and therefore, the first and second interfacial cementation qualities for well cementation are improved.

Provided is a drilling-free cement injecting device for a horizontal well. Connection is carried out procedure by procedure according to the well cementing procedures. In the well wall washing process, a lengthened two-stage parallel setting casing pipe outer packer is connected with an inner-pipe-free and drilling-out-free device and is further connected with a well cementing pipe column to be lowered to the well bottom. In the cement injecting and well cementing processes, a first-stage opening and closing sliding sleeve rubber plug is connected with the inner-pipe-free and drilling-out-free device in a casting mode and is connected with a packer opening and closing sliding sleeve in a colliding mode under the pumping pressure, the packer opening and closing sliding sleeve descends to open a packer communication channel and seal the lengthened two-stage parallel setting casing pipe outer packer in an expanding mode, pressure shutting-in continues, and the packer opening and closing sliding sleeve descends to push a cement grey injecting hole opening and closing sliding sleeve to descend to open a cement grey injecting hole and carry out cement injecting. In the well cementing, pressure shutting-in and cementing waiting processes, a second-stage displacing colliding press rubber plug is connected with the inner-pipe-free and drilling-out-free device in a casting mode, connected with a colliding press sleeve in a colliding mode under the action of displacing liquid and connected with a colliding slip of the first-stage opening and closing sliding sleeve rubber plug. In the drill-down and fishing processes, a self-locking recessing fishing socket is connected with a slip of the second-stage displacing colliding press rubber plug through a fishing pipe column to fish out accessories in the inner-pipe-free and drilling-out-free device at a time.

The invention relates to a high-efficiency oil-based flushing and isolating fluid. The flushing and isolating fluid is prepared by weight ratio of the following components: 100 parts of clear water, 1.0 to 1.5 parts of surfactant, 4.0 to 5.0 parts of chelating agent, and 2.0 to 4.0 parts of Suspension stabilizer, 0.6-0.8 part of thickener, 0.5-0.75 part of viscosifier, 25-150 part of weighting agent, 1.0-5.0 part of pH regulator, 0.2-0.4 part of defoamer. The invention provides a high-efficiency flushing and isolation fluid specially used for oil-based drilling fluid, which has dual functions of flushing and isolation, has high flushing efficiency, wide range of density adjustment, good suspension stability, can effectively improve interface cementation conditions, and improve cementing performance. quality.

The invention provides a method for well cementation drilling-free blind plate circulating well cementation of a horizontal well. A body of a large-channel horizontal well cementation drilling-free blind plate circulating well cementation device formed by organic combination of an elongated two-stage parallel connection seat sealing sleeve outer packer and an inner-pipe-free drilling-plug-free classification cementing device is connected with a sleeve, a circulating channel between the sleeve and a well wall is formed, pad fluid is injected to clean the well wall; after the well wall is cleaned, a self-locking returnable primary switch sliding sleeve rubber plug is placed from a well opening cement head and is pumped into the inner-pipe-free drilling-plug-free classification cementing device, the elongated two-stage parallel connection seat sealing sleeve outer packer undergoes expanding sealing, a circulating hole of the inner-pipe-free drilling-plug-free classification cementing device is opened, cementing well cementation is performed; after cement is injected, a self-locking returnable secondary replacing pressing rubber plug is placed from the well opening cement head, displacement fluid is utilized to press the self-locking returnable secondary replacing pressing rubber plug, the self-locking returnable secondary replacing pressing rubber plug enters the inner-pipe-free drilling-plug-free classification cementing device, the circulating hole of the inner-pipe-free drilling-plug-free classification cementing device is closed until cement slurry is solidified, a drill performs downward drilling to salvage accessories in the inner-pipe-free drilling-plug-free classification cementing device, a drafting process is performed, and well cementation work is finished.

The invention discloses a plugging material and plugging slurry for protecting a reservoir stratum with the low fracturing fracture ability. The plugging material is prepared from, by weight, 5-6 parts of walnut shell powder, 2-3 parts of a composite plugging agent, 1.5-2 parts of an agent for plugging while drilling, 4-5 parts of an acid soluble plugging agent, 4-5 parts of a high-dehydration-rate plugging agent and 0.2-0.3 part of calcium oxide. The natural plant inertia material, the fiber plugging agent and the acid soluble plugging agent are mixed according to the certain matching ratio to form the acid soluble plugging material in granule and fiber shapes. The material has the advantages that the bridging effect of a bridging material is good and the plugging success rate is high, and also has the advantages that the density is low, stratum pressure is effectively balanced, the stratum damage is small, the plugging property is strong and acid solubility is achieved. The plugging slurry prepared from the plugging material and water has the advantages of being low in density, high in pressure bearing capability, good in malignant leakage plugging effect, high in acid solubility and the like; the on-site preparation process is simple, construction is safe and reliable, and the purposes of reducing well leakage loss and protecting the reservoir stratum can be achieved.

The invention relates to a modularized plate-type ozone generator. The modular plate-type ozone generator comprises a top plate, a plurality of dielectric barrier discharge modules, a gas rectification shield and a gas outlet rectification shield, wherein the top plate and the dielectric barrier discharge modules are sequentially arranged in a stacked manner, a cooling liquid outlet is formed in the top plate; a cooling liquid inlet is formed in the dielectric barrier discharge module located at the tail end; each dielectric barrier discharge module further comprises an integrated high-voltage electrode body, a ground electrode with a barrier dielectric layer and a power source connector, the integrated high-voltage electrode body is packaged inside the groove of the ground electrode with the barrier dielectric layer and the power source connector is mounted on the ground electrode with the barrier dielectric layer. By the ozone generator, the structure of the plate-type ozone generator can be simplified, the weight of the plate-type ozone generator is decreased and the production cost is decreased.

The invention provides a whole oil-based drilling fluid viscosifier and a preparation method thereof. The preparation method for the whole oil-based drilling fluid viscosifier comprises the steps: 1) uniformly mixing 15-50 parts by weight of polyester polyol, 5-15 parts by weight of a polymerization promoter and 50-150 parts by weight of a solvent at room temperature so as to obtain a mixture; 2) heating the mixture to 40-60 DEG C, adding 15-80 parts by weight of isocyanate and 0.3-1.0 part of a polymerization catalyst under a stirring condition, and continuing to heat the mixture to 70-90 DEG C and enabling the mixture to react for 3-5 h so as to obtain an intermediate product; and 3) cooling the intermediate product to 40-50 DEG C, adding 5-15 parts by weight of a polymerization promoter, heating to 60-80 DEG C and continuing a reaction for 2-3 h so as to obtain the whole oil-based drilling fluid viscosifier. The whole oil-based drilling fluid viscosifier prepared by the preparation method can effectively improve suspension stability of a drilling fluid and improve the rheological property of the drilling fluid without changing the density of the drilling fluid; and therefore, the whole oil-based drilling fluid viscosifier is suitable for exploration and development of low pressure reservoirs.

The invention discloses an alcohol sales machine, which comprises a shell, wherein the shell forms a box body by a front shell, a back shell and side shells; an alcohol receiving window, an operating screen and an alcohol discharging button are arranged on the upper end of the front shell; an alcohol barrel observing window is arranged on the lower end of the front shell; a glass lifting door is arranged on the window part of the alcohol receiving window; an alcohol barrel is arranged on the lower end in the shell; a puncturing and alcohol pumping system corresponding to the alcohol barrel is arranged in the shell; an alcohol discharging box body is arranged in the alcohol receiving window of the shell; an alcohol discharging pipe is arranged in the alcohol discharging box body; an alcohol pumping pipe communicated with the alcohol barrel and the alcohol discharging pipe is arranged in the puncturing and alcohol pumping system; a lifting door lifting system for driving the glass lifting door to lift up and down to open and close is arranged on the glass lifting door. Through the alcohol sales machine, an alcohol dealer can automatically sell retailed alcohol capacity, and an alcohol buyer can take alcohol by himself / herself according to the obtained alcohol capacity, so that convenience is brought to retailed alcohol capacity bargaining transaction.

An embodiment of the invention provides a method and a system for regulating a precision pressure-control well drilling throttle valve. The method includes acquiring displacement of a mud pump of a precision pressure-control well drilling system, displacement of a back-pressure pump and opening values of the throttle valve at a current moment and within a preset duration before the current moment in real time; predicting opening values of the throttle valve within a preset number of sampling periods after the current moment in real time according to the acquired displacement of the mud pump, the acquired displacement of the back-pressure pump and the acquired opening values of the throttle valve; adjusting opening of the throttle valve within the preset number of sampling periods after the current moment so that the opening of the throttle value is equal to the predicted opening values of the throttle valve. Precision pressure-control well drilling requirements can be met by bottom hole pressures corresponding to the predicted opening values of the throttle valve. According to the scheme, the method and the system have the advantages that the opening values of the throttle valve within the preset number of sampling periods after the current moment are predicted according to the displacement of the mud pump, the displacement of the back-pressure pump and the opening values of the throttle valve at the current moment and within the preset duration after the current moment, and accordingly the precision pressure-control well drilling throttle valve regulation effectiveness can be improved.

The invention relates to a water-saving assistant water tank device applicable to a water heater. The water-saving assistant water tank device applicable to the water heater comprises the water heater, a tap water pipe, a mixing shower valve and a water-saving assistant water tank system, wherein the water-saving assistant water tank system comprises an assistant water tank, a float valve device, a check valve, a jet valve and a stop valve which are arranged and assembled together according to a certain sequence; a water inlet of the assistant water tank is connected to a hot water inlet of the mixing shower valve through the stop valve, namely at the tail end of a hot water outlet pipeline of the water heater; a water outlet of the assistant water tank is connected with a water suction port of the jet valve through the check valve; the float valve device is arranged above the water outlet inside the assistant water tank; the water outlet of the assistant water tank is opened and closed along with the water level; a water inlet of the jet valve is connected with the tap water pipe; a water outlet of the jet valve is connected with a cold water inlet of the mixing shower valve; and the mixing shower valve can also be replaced by a cold water and hot water jetting and mixing valve and can stabilize the temperature of outlet water. The water-saving assistant water tank device applicable to the water heater can recycle cold water prestored in the pipeline, so that water waste is reduced.

The invention provides a symmetric balancing chain drive pumping unit which is a double-chain system pumping unit which is designed for solving the problems of poor reliability, high failure rate of a balancing mechanism and a reversing mechanism, etc. The double-chain system pumping unit adopts a chain sprocket transmission mechanism to transfer power based on the symmetric balancing principle, and completes reversing through two crank shaped chain links, and improves the reliability of the whole pumping unit based on the maintenance of the characteristics of the prior chain-drive pumping unit, such as long stroke, large load, light weight, nodes and so on, so that the operation is more stable.

The invention discloses an ocean tidal current power generation system. The system comprises a supporting mechanism, an ocean tidal current power generator set and a signal monitoring mechanism. The supporting mechanism comprises a foundation pile, a horizontal supporting rod and an operating platform. The ocean tidal current power generator set comprises underwater components and an overwater component; each underwater component comprises blades, a hub, a spindle, a gearbox, a coupler, a power generator, a stern compartment and a yawing mechanism, wherein a variable propeller mechanism is arranged in the hub, and the yawing mechanism is arranged between the coupler and the horizontal supporting rod; the overwater component comprises a converter and a control cabinet, and the converter and the control cabinet are both arranged on the operating platform. The signal monitoring mechanism comprises a current meter connected with the control cabinet, and the current meter is arranged on the horizontal supporting rod and used for monitoring the ocean current direction in real time. The ocean tidal current power generation system has advantages that by adoption of the fixed ocean tidal current power generation system and the half-direct-driven wind power generator set, efficient conversion of ocean current energy into electric energy can be realized safely and reliably.

The invention discloses a slurry shielding ordinary-pressure tool changer and relates to the technical field of slurry shielding tunneling machines. The slurry shielding ordinary-pressure tool changercomprises a double-hobbing-cutter device, a hobbing cutter inner cutter roller, a double-opening gate device, a flushing high-pressure valve, a pressure-relief high-pressure valve, a double-opening gate hydraulic oil cylinder, a drawing oil cylinder, a cutter roller back cover and a guiding ring, wherein the double-hobbing-cutter device is arranged on a cutter roller mounting base and is arrangedin the hobbing cutter inner cutter roller through a wedge block, and the double-hobbing-cutter device is fixedly connected with the hobbing cutter inner cutter roller through a hexagonal screw. By designing an oil filling device, the slurry shielding ordinary-pressure tool changer can achieve a double-gate sealing face and quickly form oil film, assists sealing, also assists decrease of an opening thrust of a double-opening gate and better assists power consumption reduction of the oil cylinder. In addition, by designing the flushing high-pressure valve and the pressure-relief high-pressure valve on an outer cutter roller, cutter changing safety is achieved, and stuck blockage of the hobbing cutter inner cutter roller is effectively prevented.

The present invention is arc extinguisher for breaker and belongs to the field of electric equipment technology. The arc extinguisher consists of casing with four openings, upper and lower contacts and arc extinguishing sheets. The present invention has the advantages of balanced pressure inside the arc extinguishing chamber, fast escape and no accumulation of free metal gas produced during arc distinction, less damage of walls of the arc extinguishing chamber, and long service life of the arc extinguisher.