45results about How to "Leak control" patented technology

The invention provides a rotating device and a fluid motor, an engine, a compressor and a pump using the same. In the rotating device, a non-contact sealing structure of a cylindrical inner chamber of a cylinder body is achieved through a gas film lubricating design or a liquid film lubricating design between an expansion piston ring and a star wheel sealing flange so that the rotating device can be operated in a high-frequency and oil-free working environment.

In order to solve the problem that a network is attacked or is free used because a wireless code is leaked or decoded, the invention provides a safe wireless access method. The method comprises the following steps: a wireless access point detects an access order in real time; and the wireless access point permits an access request from a wireless access workstation in a predetermined time period when detecting the access order. Besides, the invention also provides a safe wireless access device. The invention has the advantages of effectively controlling the unnecessary loss caused in such a way that the wireless code is leaked or decoded.

The invention relates to a regulating air valve for opening and closing an exhaust air flareout of an underground railway tunnel, in particular to a curtain type regulating air valve which can effectively prevent gas fume from leaking when a fire disaster happens in the tunnel. The regulating air valve comprises a framework and a reelable roller with a curtain, wherein both ends of the reelable roller are fixed at the upper end of the framework through bearing blocks; the bottom end of the framework is provided with a guide wheel bearing block; a curtain guide shaft is arranged below the framework; the curtain guide shaft is provided with a curtain guide wheel and a guide bearing block; the guide bearing block is matched with the guide wheel bearing block; the curtain guide wheel is provided with a tensioning belt connected with the curtain in a matching way; and a transmission shaft with a speed reducer and a motor is arranged on the same side of the reelable roller and the curtain guide shaft. The regulating air valve can increase the area of an air outlet during ventilation, has low air leaking rate when closed, can effectively control the smoke leakage, makes personnel evacuate in time and reduces losses of life and property.

The invention discloses a high-pressure gear pump floating side plate with a pressing plate, belonging to the technical field of high-pressure gear pumps. A W-shaped balance groove and an unloading groove are formed in one side of the floating side plate, a W-shaped sealing groove is formed in the other side of the floating side plate, a W-shaped reinforcing rib is arranged in the W-shaped sealing groove, a through hole is formed between the W-shaped sealing groove and the unloading groove, a W-shaped sealing ring is arranged in the W-shaped sealing groove, the thickness of the W-shaped reinforcing rib is less than the depth of the W-shaped sealing groove, a W-shaped pressing plate is arranged on the W-shaped sealing groove, and a W-shaped shallow slot is formed in the inner side of the W-shaped pressing plate. The W-shaped sealing ring can be well pressed by a region around the W-shaped shallow slot to ensure that a sealing effect of three end faces of the W-shaped sealing ring is well improved, the leakage of the floating side plate and the end face of a gear is effectively controlled, and the pressure resistance level of a hydraulic gear pump is increased.

The invention relates to a household garbage gas generation furnace, and particularly relates to a household garbage gas generation furnace for the resource utilization of household garbage. The resource utilization method of household garbage comprises two types, wherein one type is comprehensive treatment including separation, composting and landfill, and the other type is household garbage incineration for power generation; and at present, inclination for power generation is adopted in large and medium-sized cities in the country, and landfill is directly adopted instead of composting in the middle-sized and small cities. Since the heat value of the household garbage of the country is low, the incineration for power generation depends on raw coal or oil, the technical equipment is imported, the manufacturing cost is high, and the development is slow. The household garbage gas generation furnace provided by the invention is an environment-friendly resource comprehensive utilization technology for gasifying the household garbage by use of the heat energy generated by the spontaneous combustion of the household garbage without adding auxiliary fuel, and is designed and developed according to the components and heat value of the household garbage of the country; and moreover, the equipment is fully closed, the manufacturing is simple, the operation is stable, the cost is relatively low, and the effect is obvious.

The present invention relates to a photosensitive detector with a composite dielectric gate MOSFET structure and its signal readout method. The MOSFET structure detector is formed on a p-type semiconductor substrate. N-type semiconductor regions locate on the two sides of the top part of the p-type semiconductor substrate to form a source and a drain. An underlying dielectric layer, a photo-electron storage layer, a top dielectric layer, and a control gate are stacked on the substrate in sequence. The top insulating dielectric layer can prevent the photoelectrons stored in the photo-electron storage layer from leaking into the control gate. The source and the drain are floating when photoelectrons are collected and injected into the photoelectron storing layer to be held therein. There is a transparent or semi-transparent window for detecting incident light forming on the substrate or gate surface. This invented detector has excellent scalability, basic compatibility with the flash memory fabricating technology, low leakage current, higher imaging speed than CCD, non-sensitivity to processing defects, larger dynamic range than other structures and higher accuracy of signal readout.

The invention discloses a stair-type self-adaptive air sealing device used for an immersed type photoetching machine. The air sealing device is a device arranged between a projection lens group and a lining and is composed of an upper component, a lower component and a rotary component; in the photoetching scanning process, the boundary state of an immersed flow field can be changed rapidly along with the traction function of the high speed movement of the lining to the immersing liquid. The interior of the device adopts a multi-layer stair-type air sealing structure, the air sealing pressure is increased gradually from the center to outside, and the sealing pressure of air in each layer is adjusted in real time according to the movement direction and the speed of the lining, so that the leakage of the immersing liquid caused by insufficient periphery sealing pressure and the bubble entrainment caused by overhigh internal air sealing pressure are prevented, and thereby the self-adaptive air sealing of the liquid is realized; and meanwhile, by adopting spiral air flow auxiliary sealing outside the device, the reliability and the stability of the air sealing are further improved.

A longitudinally adjustable connecting rod (1) comprises a first rod part (4) and a second rod part (5), wherein the rod parts (4, 5) are movable telescopically relative to and / or into each other by means of a longitudinal adjustment mechanism (60), and said longitudinal adjustment mechanism (60) can be supplied with a hydraulic medium by means of a hydraulic conduit (11, 12). Said hydraulic conduit (11, 12) can be fluidically connected to a hydraulic medium supply conduit (13) by means of a control device (16). Said control device (16) has a first and a second valve (17; 22) with respective valve chambers (18; 23) and with one valve body (20, 25) each that can be forced against a valve seat (21; 26) by a restoring force. The valve chamber (18) of the first valve (17) is fluidically connected to a first hydraulic conduit (11) and the second valve chamber (23) of the second valve (22) to a second hydraulic conduit (12). The valve bodies (20; 25) can be operatively connected to each other by means of a connecting device (27) that can be moved between a first position and a second position. In the first position, the first valve body (20) and in the second position, the second valve body (25) can be lifted from the associated valve seat (21; 26) counter to the restoring force, and the first or second valve chamber (18; 23) can be fluidically connected to the hydraulic medium supply conduit (13). In the respective other position of the connecting device (27), the first valve body (20) rests on the first valve seat (21) or the second valve body (25) on the second valve seat (26), and blocks the fluid connection to the hydraulic medium supply conduit (13).

The invention provides an adsorbent for simultaneously strengthening removal of trace phosphorus and organic matter and a preparation method thereof, relates to an adsorbent and a preparation method thereof and aims at solving the problem that an existing adsorbent has low removal rate to the trace phosphorus in water and cannot remove the organic matter and phosphorus simultaneously.The adsorbent is a lanthanum-polyacrylonitrile based carbon nano fiber material.The method comprises the steps that 1, La(NO3)3 6H2O is dissolved in DMF, PAN is added, dissolution is performed to obtain a DMF solution of the PAN, high-pressure electrostatic spinning is conducted on the solution to obtain a spinning membrane, the obtained spinning membrane is subjected to alkali solution treatment, then repeated flushing is performed by using deionized water, and drying is performed; 2, the dried spinning membrane is put in a tubular furnace, pre-oxidation and carbonization are conducted in the air, the carbonized material is immersed in an alkali solution, a carbon material is flushed with the deionized water to be neutral after soaking, and drying is performed to obtain the adsorbent.The adsorbent can simultaneously and effectively remove the trace phosphorus and the organic matter and is used in the field of carbon adsorption materials.

The invention discloses a seawater electromagnetic valve bank, which consists of four mutually independent electromagnetic valves, wherein each electromagnetic valve comprises a valve component and an electromagnet component which is arranged below the valve component; each valve component comprises a valve body and a valve core which is arranged in the valve body; each electromagnet component isaccommodated in a sealing cover; each sealing cover is fixedly connected with each valve body into a whole; a valve sleeve is arranged outside each valve core; the lower part of each valve core is provided with a valve seat; each valve core and the corresponding valve seat form a valve port; the lower part of each valve seat is provided with a valve sleeve seat; one end of a push rod penetrates through each valve sleeve seat and then comes into contact with the lower part of the corresponding valve core, and the other end of the push rod is in contact with the corresponding electromagnet component; the upper part of each valve core is sealed through a screw plug; the top of each valve core is butted against the corresponding screw plug through a spring; and a stop ring is arranged at the position of the lower part of each valve sleeve seat, between each valve component and the corresponding electromagnet component. The valve bank provided by the invention can be directly applied to seawater environments and other corrosive environments, and has the advantages of simple structure, small pressure loss, convenience in disassembly, assembly and maintenance, no small damping holes, high anti-pollution capacity and the like.

The invention belongs to the technical field of a sealing-up and plugging materials, and particularly relates to a method for preparing plugging agents. The method includes smashing diatomaceous earth, bentonite, sepiolite and the like and mixing and stirring the diatomaceous earth, the bentonite, the sepiolite and water to obtain suspension; collecting emulsion from rubber trees, mixing and heating the emulsion, heavy calcium carbonate, carboxymethyl celluloses and polyamide fibers to obtain first mixtures; adding silane coupling agents into the first mixtures and carrying out ultrasonic treatment to obtain modified natural emulsion; mixing, heating and stirring the modified natural emulsion and lauroyl diethanolamine solution to obtain second mixtures, adding initiators, the suspension and cross-linking agents into the second mixtures, stirring the second mixtures, the initiators, the suspension and the cross-linking agents to obtain third mixtures and adding acrylamide solution into the third mixtures; carrying out reaction and then discharging and drying reaction products to obtain the plugging agents. The method has the advantages that the plugging agents prepared by the aid of the method are high in blocking speed and plugging success rate, formed plugging layers are high in loading capacity, good plug forming effects can be realized, repeated leakage can be prevented, and the plugging agents are little in environmental influence and free of pollution, are non-toxic and can be constructed safely and quickly.

The invention relates to a microbubble workover fluid and a preparation method thereof and belongs to the field of workover treatment of petroleum and gas. The microbubble workover fluid provided by the invention is composed of the following components in parts by mass: 90-200 parts of water, 0.2-1.6 parts of soapberry extract, 0.1-1 part of fatty alcohol-polyoxyethylene ether AEO, 0.5-2 parts of xanthan gum and 0.3-0.8 part of thiourea. The microbubble workover fluid provided by the invention is high in viscosity, good in foam stability, high in oil resistance, high in capacity of resisting degree of mineralization and suitable for gas condensate-containing natural gas wells with high degree of mineralization and low pressure. The microbubble workover fluid provided by the invention is non-toxic and easy to degrade, and does not pollute the environment.

The invention belongs to the technical field of compressors, and particularly relates to a floating type axial sealing structure. The technical scheme is as follows the floating type axial sealing structure comprises a static scroll plate and a dynamic scroll plate are correspondingly provided with a vortex tooth, a sealing groove is formed in the tooth surface of the vortex tooth, and a sealing structure is arranged in the groove; the shape of the sealing structure corresponds to the shape of the vortex tooth, the sealing structure is composed of a wear-resisting sheet, a sealing strip and asealing lining from outside to inside in sequence through glue; the sealing structure is divided into three sections from the outer ring to the inside in sequence along the rotation direction of the vortex tooth by the partition plates which are arranged in the sealing groove: a low -pressure sealing section, a medium-pressure sealing section and a high-pressure sealing section; in terms of length, the low-pressure sealing section is larger than the medium-pressure sealing section, the medium-pressure sealing section is larger than the high-pressure sealing section; the partition plates playsan air-sealing role on the sealing groove. The vortex tooth and the sealing structure are designed according to different pressures of the vortex tooth, the gas flow in the tooth grooves is reasonablyplanned, the sealing effect of the sealing structure is improved, and radial leakage is effectively controlled.

The invention discloses a low-temperature plasma synergistic SCR waste gas treatment device which comprises a plasma module consisting of a low-temperature plasma generating tube, a spiral high-voltage electrode, a spiral guide vane and insulating ceramic, and an SCR reaction module consisting of a urea injection tube, a mixer, a guide device, an SCR reaction shell and a catalyst. According to the scheme of the low-temperature plasma synergistic SCR waste gas treatment device, when waste gas enters the low-temperature plasma generation pipe from the gas inlet pipe, passes through the spiral guide vanes and uniformly flows in the discharge area, the spiral high-voltage electrode and the spiral guide vanes improve the circulation and uniformity of gas, and the discharge reaction space is effectively utilized, and the reaction waste gas and the sprayed urea are fully mixed through the mixer and the fluid director and quickly react in the SCR reactor. The low-temperature plasma technology and the SCR technology are organically combined, PM and NOX are integrally treated, and the device has the advantages of being simple, capable of saving energy, high in purification efficiency and the like.

The invention discloses a knocking device for removing carbon deposition from a coal gasifier. The knocking device comprises a support body, a guide sleeve, a pressing sleeve, a piston rod, a piston, a hammer body and a filter arranged in the support body, and is characterized in that: a piston rod seal is a cartridge seal structure arranged in the pressing sleeve, and the pressing sleeve and the guide sleeve are sealed by an end face seal gasket; an O-shaped seal ring and a piston rod V-shaped seal structure are arranged in the cartridge seal structure; the piston rod V-shaped seal structure comprises a piston rod V-shaped ring, a piston rod support ring, a push ring pressed against the tail end of the piston rod support ring, and a piston rod spring supported on the push ring; the piston rod support ring and the piston rod V-shaped ring are limited by a collar at the periphery; and the piston rod spring pre-tightens the piston rod V-shaped ring through the push ring. By arranging the cartridge seal structure, the seal is reliable, the service life of the knocking device is long, the knocking device is convenient to assemble and disassemble, and seal elements can be replaced under the condition that the whole knocking device is not detached after the seal fails.

The invention belongs to the technical field of fuel supply for internal combustion engines, and in particular, relates to a novel structure low-temperature pump. The novel structure low-temperature pump comprises a cold end area, an air-state cooling area and a hot end area; the air-state cooling area is arranged between the cold end area and the hot end area; the cold end area comprises a cold end pump body and a vacuum insulation cover; a cold end piston is arranged in the cold end pump body; the end part of the cold end piston is designed in a ring groove opening form; the head part of a cold end connecting rod is mounted in a piston opening ring groove; the hot end area comprises a hot end piston; the hot end piston is mounted in a hot end pump body; a pressure relief device is arranged on the hot end piston; a displacement sensor is arranged on the hot end pump body; and a high-pressure air pipe is arranged in the air-state cooling area. The novel structure low-temperature pump has the following beneficial effects: liquefied natural gas in a low-temperature tank can be totally pumped out to improve the vehicle endurance; the structure is simple and effective; the reliabilityis improved; the machining manufacturability is excellent; and the batch production is convenient.

The invention discloses a method for preventing flue leakage of an exhaust-heat boiler of a converter. When the pressure of a steam drum of the exhaust-heat boiler of the converter is no less than 1.8 MPa, a blow-off valve of the steam drum is opened by 20%; when the pressure of the steam drum is no less than 1.9 MPa and no more than 2.1 MPa, the blow-off valve of the steam drum is opened by 70%; and when the pressure of the steam drum is more than 2.1 MPa, the blow-off valve of the steam drum is opened by 100%. According to the invention, the openness of the blow-off valve is controlled in segments according to the pressure of the steam drum, so the pressure of water current in the flue of the exhaust-heat boiler is stabilized; the pressure of cooling water is stabilized at 1.5 to 1.9 MPa, and the flow velocity of water in closely pitched tubes of the flue reaches 1.3 to 1.5 m / s; so water cooling intensity of the exhaust-heat boiler of the converter to the flue is improved, forced shutdown and overhauling of the converter caused by tube explosion and leakage of the flue are effectively reduced, and the smelting efficiency of the converter is improved. The method provided by the invention has the characteristics of simpleness, substantial leakproof effect on the flue, conservation of considerable soft water resources and prolongation of the service life of the flue.

The invention relates to a feeding device of a screening machine for producing ink powder. A feeding pipe flange is fixed with a feeding pipe; two shaft sleeves are respectively fixed on the feeding pipe flange and the feeding pipe; two oiliness seal rings are respectively arranged in the two shaft sleeves; a feeding screw is arranged in the feeding pipe and in the shaft sleeves provided with theoiliness seal rings; the other end of the feeding screw passes through the feeding pipe flange and is connected with connecting sleeves arranged in the shaft sleeves provided with the oiliness seal rings; a speed reducer flange is fixedly connected with the feeding pipe flange through the connecting rods; an output shaft on an alternating current single-phase speed reducer is fixedly connected with the connecting sleeves. By the feeding device, time and labor are saved during installation, maintenance and debugging of the alternating current single-phase speed reducer and the feeding screw, the maintenance cost is saved, waste of an ink product is reduced, the product yield is improved, and most important, dust leakage is effectively controlled, and environmental protection is achieved.

The invention discloses an integrated uniform temperature plate and a manufacturing method thereof. The uniform temperature plate comprises a shell base, cooling fins, a sealing part and working fluid. The shell base is formed in a drawing or extruding mode and comprises a bottom plate, a top plate and side plates, and a containing cavity is formed among the bottom plate, the top plate and the side plates in a surrounding mode; each radiating fin is formed by extending from the surface, back to the bottom plate, of the top plate. The sealing parts are respectively formed at the head end and the tail end of the accommodating cavity. The working fluid is arranged in the containing cavity. Therefore, the integrated uniform temperature plate disclosed by the invention is easy to manufacture and has a good heat dissipation effect.

The invention discloses a nitrogen oxide mixing treatment device. The nitrogen oxide mixing treatment device comprises a hollow outer shell and a mixer arranged in the outer shell, wherein a gas inlet is formed in one end, relatively close to the mixer, of the outer shell, a cyclone structure is arranged at one end, relatively far away from the mixer, of the outer shell, and the cyclone structure is used for uniformizing gas and guiding flow; the interior of the mixer is hollow, a plurality of first through holes are formed in the side wall of the mixer at intervals, and guide plates facing the inner wall of the outer shell are arranged at the edges of the first through holes; a through nozzle is vertically arranged at the upper end of the outer shell, faces the interior of the mixer and is used for injecting reactants; and a filter screen for decomposing gas particles is arranged at the lower end in the mixer. According to the nitrogen oxide mixing treatment device, the catalytic reaction efficiency of nitrogen oxides is improved, and the ammonia gas leakage problem is controlled; and the exhaust resistance is reduced, the exhaust back pressure is reduced, the flow field uniformity and the urea crystallization resistance are improved, and the working efficiency is improved.

The invention relates to a fluidized bed system for grading, drying and upgrading lignite. The fluidized bed system comprises a fluidized bed, coal-burning hot air furnaces and a hot air recycling system, and the hot air recycling system hermetically connects the coal-burning hot air furnace with the fluidized bed. The fluidized bed system is characterized in that broken lignite entering the fluidized bed is divided into upgrading coal granules and fine coal powder, the fine coal powder is sent into the coal-burning hot air furnaces for burning to provide heat for the fluidized bed system, the fluidized bed system further comprises a lignite grading and upgrading system, and the upgrading coal granules are graded according to granular size in the fluidized bed under action of the lignite grading and upgrading system and subjected to upgrading of different degrees according to difference in granular size of the coal granules. By the fluidized bed system, industrialized grading, drying and upgrading of lignite can be realized, and utilization rate of lignite is increased.

The invention provides a turbine cooling gas circuit of a gas turbine and a gas turbine, comprising a compressor, a fuel pressure cylinder, a compressor rotor, an intermediate disk, a turbine rotor and a rotor sealing ring, the fuel pressure cylinder is arranged on the outer circumference of the intermediate disk and the fuel pressure There is a rotor sealing ring between the cylinder and the intermediate disc. One end of the intermediate disc is connected to the compressor rotor, and the other end of the intermediate disc is connected to the turbine rotor. The space forms a static chamber; the rotor seal ring is provided with a cooling air channel; the turbine rotor is provided with a turbine cooling channel; the rotor seal ring separates the rotary chamber into a fuel pressure cylinder chamber and a turbine rotor forward static chamber. Chamber; the outlet of the compressor is connected with the chamber of the fuel pressure cylinder, the cooling air channel is connected with the chamber of the fuel pressure cylinder and the static chamber of the turbine rotor, and the static chamber of the turbine rotor is connected with the cooling passage of the turbine .

The invention relates to a feeding device of a screening machine for producing ink powder. A feeding pipe flange is fixed with a feeding pipe; two shaft sleeves are respectively fixed on the feeding pipe flange and the feeding pipe; two oiliness seal rings are respectively arranged in the two shaft sleeves; a feeding screw is arranged in the feeding pipe and in the shaft sleeves provided with theoiliness seal rings; the other end of the feeding screw passes through the feeding pipe flange and is connected with connecting sleeves arranged in the shaft sleeves provided with the oiliness seal rings; a speed reducer flange is fixedly connected with the feeding pipe flange through the connecting rods; an output shaft on an alternating current single-phase speed reducer is fixedly connected with the connecting sleeves. By the feeding device, time and labor are saved during installation, maintenance and debugging of the alternating current single-phase speed reducer and the feeding screw, the maintenance cost is saved, waste of an ink product is reduced, the product yield is improved, and most important, dust leakage is effectively controlled, and environmental protection is achieved.

The embodiment of the present invention provides an axial force self-balancing device and method for a single-stage single-suction centrifugal pump, which relates to the field of water pump equipment. The axial force self-balancing device includes: a pump body, an impeller arranged in the pump body, an The pump back cover on one side, the shaft sleeve set in the shaft hole of the pump back cover and the pump shaft connected to the impeller after passing through the shaft sleeve at one end; the front cavity is enclosed between the front cover plate of the impeller and the pump body, There is a first gap between the front sealing ring of the impeller and the pump body, the front cavity communicates with the inlet of the impeller through the first gap, a balance chamber is enclosed between the back cover of the impeller and the back cover of the pump, and the rear sealing ring of the impeller is respectively There is a second gap between the pump body and the pump back cover, and a plurality of balance holes are arranged at intervals on the back cover. The balance holes extend to the shaft sleeve and form a third gap with the shaft sleeve. The impeller realizes axial force self-balancing through self-adjustment, without adding devices such as back blades, balance discs or balance drums. The structure is simple, easy to process, and effectively reduces costs.

The invention discloses a stair-type self-adaptive air sealing device used for an immersed type photoetching machine. The air sealing device is a device arranged between a projection lens group and a lining and is composed of an upper component, a lower component and a rotary component; in the photoetching scanning process, the boundary state of an immersed flow field can be changed rapidly along with the traction function of the high speed movement of the lining to the immersing liquid. The interior of the device adopts a multi-layer stair-type air sealing structure, the air sealing pressure is increased gradually from the center to outside, and the sealing pressure of air in each layer is adjusted in real time according to the movement direction and the speed of the lining, so that the leakage of the immersing liquid caused by insufficient periphery sealing pressure and the bubble entrainment caused by overhigh internal air sealing pressure are prevented, and thereby the self-adaptive air sealing of the liquid is realized; and meanwhile, by adopting spiral air flow auxiliary sealing outside the device, the reliability and the stability of the air sealing are further improved.

The invention provides an adsorbent for simultaneously strengthening removal of trace phosphorus and organic matter and a preparation method thereof, relates to an adsorbent and a preparation method thereof and aims at solving the problem that an existing adsorbent has low removal rate to the trace phosphorus in water and cannot remove the organic matter and phosphorus simultaneously.The adsorbent is a lanthanum-polyacrylonitrile based carbon nano fiber material.The method comprises the steps that 1, La(NO3)3 6H2O is dissolved in DMF, PAN is added, dissolution is performed to obtain a DMF solution of the PAN, high-pressure electrostatic spinning is conducted on the solution to obtain a spinning membrane, the obtained spinning membrane is subjected to alkali solution treatment, then repeated flushing is performed by using deionized water, and drying is performed; 2, the dried spinning membrane is put in a tubular furnace, pre-oxidation and carbonization are conducted in the air, the carbonized material is immersed in an alkali solution, a carbon material is flushed with the deionized water to be neutral after soaking, and drying is performed to obtain the adsorbent.The adsorbent can simultaneously and effectively remove the trace phosphorus and the organic matter and is used in the field of carbon adsorption materials.

The invention relates to an assembly type gas meter box prefabricated clamping and pressing connection assembly which comprises two meter boxes to twelve meter boxes. The prefabricated clamping and pressing connecting assembly matched with the gas meter box body is composed of a gas main pipeline, a first gas branch pipeline, a second gas branch pipeline, a third gas branch pipeline, a fourth gas branch pipeline, a fifth gas branch pipeline, a sixth gas branch pipeline, a pipeline fixing device and a gas meter. According to the fabricated gas meter box, a left-in-left-out structure, a left-in-right-out structure, a right-in-left-out structure or a right-in-right-out structure is customized according to clients, the construction efficiency is improved, the installation difficulty is reduced, the gas main pipeline, the gas flow dividing pipe assembly and the loose joint type flow stabilizing pipeline are all prefabricated parts, factory assembly line work is achieved, compared with the prior art, the working efficiency is improved by more than 50%, and the cost is reduced. The production cost is reduced by more than 35%, on-site welding and wire twisting are not needed, connection nodes and leakage points are reduced, the leakage problem of the joint in the gas meter is effectively controlled, the market prospect is wide, and the economic benefit is remarkable.