62results about How to "Play a role in pressure relief" patented technology

The invention provides a grouting treatment method for a broken water-rich section of a diversion tunnel in a karst area. The method includes the following steps: S1) conducting geological explorationon the broken water-rich section of surrounding rock with water inrush to determine a major runoff path of fissure water and/or groundwater; S2) drilling a drainage hole from a tunnel wall of the broken water-rich section of the surrounding rock to the runoff direction of the fissure water and/or the groundwater in the surrounding rock for drainage of the fissure water and/or the groundwater; S3)drilling grouting holes at preset distance along the radial and circumferential directions of the tunnel wall of the broken water-rick section of the surrounding rock and inserting a grouting pipe into each grouting hole; S4) injecting grouting liquid into the surrounding rock through the drainage hole and the grouting pipes to form a water stop curtain circumferentially in the surrounding rock of the tunnel wall. According to the method, a better grouting treatment effect is achieved, the engineering safety is ensured, and the groundwater resource pollution is reduced.

A noise-reducing range hood comprises a draught fan, a draught fan housing and an exhaust fume collecting hood arranged under the draught fan housing. The draught fan comprises a volute, a vane wheel and a motor used for driving the vane wheel, the volute is provided with a volute back side plate and a volute front side plate, and a current collecting ring is installed at an air inlet of the draught fan. The noise-reducing range hood is characterized in that the air inlet is a back air inlet formed in the volute back side plate, a diversion cone is installed on the current collecting ring, the diameters of the diversion cone are gradually increased in the air inlet direction, and the motor is located on the back side portion of the vane wheel and directly faces the diversion cone. Compared with the prior art, the noise-reducing range hood has the advantages that a back side air inlet mode is adopted by the noise-reducing range hood, the diversion cone is installed on the current collecting ring, the motor is arranged on the back side portion of the vane wheel and directly faces the diversion cone, the diversion cone not only can play the role of reducing noise at the air inlet, but also can block the motor so as to avoid the influence, caused by the motor, to the back air inlet mode, and therefore the vane wheel can be disassembled from the front side, and later-stage maintenance of the motor and volute cleaning can be conducted conveniently.

The invention discloses a noise reducing impeller and a range hood applying the impeller. The noise reducing impeller is provided with a noise reducing hole in a front side blade of a middle disc; a fan intake port of the range hood is a back intake port formed in a volute back side plate; a volute front side plate is provided with a front ventilation port communicated with a fan exhaust port; the front ventilation port and the back intake port are separated through the middle disc of the noise reducing impeller; and a noise reducing cavity communicated with the front ventilation port is formed in front of the fan or in front of and below the fan. The noise reducing impeller is provided with the noise reducing hole in the front side blade of the middle disc for reducing the operation noise; in addition, the range hood adopts a back side intake mode, and the noise reducing cavity is formed in the front side of the fan, so that lampblack can be prevented from sucking by the front ventilation port from the lower side of a hood, the disordered flowing noise of air currents in the front side space of a fan cover is eliminated, and meanwhile, the path of outwards propagating the noise through the front side of the fan cover can be stopped; and under the condition of high resistance of a public flue, the noise reducing cavity also can achieve a pressure relief effect.

The invention discloses a cut blasting optical design method under a high crustal stress condition. The cut blasting optical design method is characterized by comprising the following steps: 1) determining the direction of maximal main stress on a tunnel face and the direction of minimal main stress on the tunnel face; 2) designing a rhomboid cut blasting hole according to the direction of the maximal main stress and the direction of the minimal main stress, wherein the rhomboid long diagonal line is the same as the direction of the maximal main stress, and the rhomboid diagonal line is the same as the direction of the minimal main stress; 3) forming a central hole in the center of a rhomboid surface according to the arrangement mode of the rhomboid cut blasting hole; and 4) detonating a cutting hole outside and then detonating explosives in an empty hole, thereby achieving the effect of throwing rock mass. The cut blasting design method has the beneficial effects that: the problem that rock mass cut blasting under the high crustal stress condition is difficult is overcome through the design of the cutting hole and the central hole, and the effect of releasing pressure of the deeprock mass can be achieved, so that energy inside some rock mass can be released untimely, and occurrence probability of rock burst can be favorably reduced.

The invention relates to a load reducing type sound barrier unit plate. The load reducing type sound barrier unit plate comprises a unit plate body (2) and lap joint parts (1), wherein the lap joint parts (1) are arranged at the two ends of the unit plate body (2) respectively and used for the mutual lap joint of the upper and lower adjacent load reducing type sound barrier unit plates. Because a gap exists between the upper and lower lap joint load reducing type sound barrier unit plates, and airflow on the road surface can penetrate a sound barrier to enter into the exterior of the road surface and play a role in pressure relieving on the road surface; the load reducing type sound barrier unit plate is provided with sound transmission holes and through holes, a part of sound waves and the airflow which enter into the interior of the unit plate is obstructed, weakened and absorbed by sound absorption lining parts, and the other part of the sound waves and the airflow which enter into the interior of the unit plate penetrates the sound transmission holes and the through holes and are discharged to the other side of the sound barrier. The load reducing type sound barrier unit plate has the advantages of not only effectively reducing noise, but also reducing airflow pressure on the road surface, reducing the pressure difference between the two sides of the sound barrier, effectively reducing the affect of the airflow on vehicles on the road surface, reducing the damage to the sound barrier, and prolonging the service life of the sound barrier.

The invention relates to an oil well mouth blowout preventing device. Two semi-casings are clamped oppositely to be fixed to form a cap-shaped casing. The casing is provided with a top cover integrally molded and a cavity with a lower opening, the lower portion of the casing is provided with a jackscrew hole for a jackscrew to penetrate through, and the jackscrew hole is used for fixing the oil well mouth blowout preventing device on the periphery of a well mouth packing box pressing cover. A gap is formed between the lower portion of a casing inner wall and an outer wall of the well mouth packing box pressing cover. The top cover is provided with a central hole for a polish rod to penetrate through, and the central hole is communicated with a cavity. An annular packing tray is fixedly arranged in the cavity, and an accommodating space for accommodating packing is arranged between the packing tray and the top cover. Therefore, well liquid ejected out during blowout is blocked on an inner wall of the blowout preventing device passively through the cap-shaped structure and flows back to an oil jacket annulus along the inner wall, and large-area environment pollution can not be caused during blowout.

The invention relates to an overload connection joint mechanism which comprises a sealing connection part and a filtering pressure relief part. One end of the sealing connection part communicates withan oil cylinder in a sealing way; the other end of the sealing connection part is connected with the filtering pressure relief part in a sealing way; the sealing connection part comprises an elasticsealing piece, a pressing connection piece and a connecting oil pipe; and the filtering pressure relief part comprises an oil tank, a filter box and a buffer air bag. The overload connection joint mechanism has the advantages of reliability in sealing, convenience in installing, low technical requirement on installation, and stable performance.

The embodiment of the invention relates to the technical field of display screen manufacturing, and discloses an evaporation crucible. The evaporation crucible comprises a crucible body and a filtering device; the crucible body is used for accommodating an evaporation material; the filtering device is arranged in the crucible body, and comprises a central part and a peripheral part surrounding thecentral part; the crucible body comprises a bottom wall used for bearing the evaporation material, and the peripheral part is obliquely arranged in the direction away from the bottom wall; and the central part is used for blocking solid impurities in the evaporation material, a plurality of first through holes are formed in the peripheral part in a penetrating mode, so that the evaporation material passes through the filtering device after being vaporized. According to the evaporation crucible, the impurities in the evaporation material can be filtered, and the evaporation material can be smoothly sprayed out of the evaporation crucible after being vaporized.

The invention discloses a machining process of a foaming cover of a foam maker, and belongs to food making tools. Due to a large number of air holes existing in a blank produced through a traditionalcasting process of an existing foam maker foaming cover and conveying casting defects, the defect that the mechanical performance of various aspects is greatly reduced is caused. The machining processspecifically comprises the following steps of a, discharging, b, forging and pressing, c, turning, d, drilling, e, milling, f, threading and g, surface treatment. After a rod is heated, forged and pressed to form the approximate appearance of the foaming cover, machining of other portions and the inner structure is carried out, the situation that in the traditional foaming cover, a manufacturer adopts aluminum casting forming, and consequently a large number of air holes exist in a material of the foaming cover is avoided, and the mechanical performance of the foaming cover is improved.

The invention discloses a cover structure of an electric pressure cooker, which comprises a surface cover and an inner cover below the surface cover; the inner cover is provided with fastening teeth which are mutually rotationally matched with an outer cooker body of the electric pressure cooker; and the surface cover and a cooker body are connected in an overturning way by a hinge. The cover structure is characterized in that: the central position of the surface cover is provided with a central hole of the surface cover and a rotating central shaft; the rotating central shaft is axially positioned and can be radially rotationally arranged in the central hole of the surface cover; and the inner cover is fixedly connected with the rotating central shaft. In the cover structure, the rotating central shaft is rotated to drive the inner cover fixedly connected with the rotating central shaft to rotate, so that the aim of opening or fastening a cover is achieved, and the cover structure is simpler and has lower cost. The technical proposal can be suitable for cover structures of various pressure cookers.

The invention relates to the technical field of industrial internet, in particular to an industrial internet big data center host which comprises a stainless steel protective shell and a host body, the host body is movably installed in the stainless steel protective shell, a water storage cavity is formed in the inner wall of the stainless steel protective shell, and a stainless steel pipe is arranged between the host body and the stainless steel protective shell. A pair of connecting pipes is fixedly embedded into the left portion of the rear end of the inner wall of the stainless steel protective shell, and rubber sheets are fixed to the inner walls of front end pipe openings of the connecting pipes. The main machine body is arranged in the stainless steel protective shell, water cooling heat dissipation can be achieved through the stainless steel pipe, drinkable water is directly contained in the water storage cavity of the stainless steel protective shell, the dual water cooling heat dissipation effect can be achieved, the heat dissipation performance of the main machine body is improved in cooperation with the draught fan, the problem that the heat dissipation effect is poor due to the fact that heat dissipation is generally conducted on an existing industrial internet big data center host through a heat dissipation fan is solved.

This invention discloses one air compressor compensated start device, which is set into air compressor discharge chamber and is composed of valve board and valve slices, wherein, the valve board is opened with discharge hole or tank; it is characterized by that the valve slice is of bent shape on valve board; the valve board discharge hole or tank is set down valve slice; the said slice one end is fixed on valve board through screw nail and other end bend up for larger than 25 degrees.

The invention belongs to the technical field of water chilling machines, and particularly relates to an industrial water chilling unit which comprises a purification device, a water inlet, a water outlet and a gas-liquid separator, the water inlet is located in the lower left end of the purification device, the water outlet is located in the center of the top of the purification device, and the purification device comprises a shell, a filter element device and a top column; the baffle ring is located on the lower half portion of the shell, the filter element device is installed above the baffle ring and comprises an upper cover plate, a lower cover plate and a filter screen, the upper cover plate is fixedly connected with the filter screen, the filter screen is fixedly connected with the lower cover plate, the top column is vertically installed in the filter screen and comprises a top plate and a top rod, and the top plate is in sliding connection with the inner side of the filter screen. According to the invention, the air pump is directly used as a power source, the structure is relatively simple, the cost of later maintenance is reduced, secondary filtration is realized through the design of the top column, and the filtration effect is improved.

The invention discloses a buffer system for draining local burst gushing water of a tunnel. Accumulated water in the tunnel is drained to the outside of the tunnel through a central ditch, a burst water gushing area on the outer side of the tunnel is provided with a water collecting tank, a buffer tank is arranged on the outer side of the water collecting tank, the water collecting tank is connected with the buffer tank through a drainage channel, the buffer tank is connected with the central ditch through a drainage pipe, a valve is mounted on the drainage pipe, a drainage pump is arranged in the buffer tank, and a water outlet of the drainage pump is connected with a water inlet of the drainage pipe. The invention further discloses a control method of the buffer system for draining local burst gushing water of the tunnel. The drainage pump and the valve on the drainage pipe are opened or closed according to the water height of a position, corresponding to the buffer tank, in the central ditch, so that water in the buffer tank is cleared as far as possible, and the quantity of water in the central ditch is kept in the maximum flow value of the central ditch. Local burst gushing water of the tunnel is timely collected and drained by the aid of the temporary water storage function of the buffer tank, pressure is safely relieved, and safety of the tunnel is facilitated.