62results about How to "Meet ventilation requirements" patented technology

The present invention discloses a method for ventilating double-hole tunnel network, which comprises the following steps : A. installing two transverse ventilation channels for exchanging air at the appropriate positions of two channels for forming a bidirectional air exchange system; B. designing the most economic air quantity of the double line to one half of the total required air quantity of the channel; C. confirming the positions of the transverse ventilation channels according to a principle that the energy consumption of the ventilation is minimal; D. obtaining the quantity of the airexchanged by the bidirectional air exchange system according to the principle that the air exchange quantities of two transverse channels are equal and the concentrations of the pollutant at the channel outlets are equal for obtaining the air quantity exchanged by the bidirectional exchange system; E. dividing a ventilation network map according to the position of the transverse ventilation channels; F. calculating the ventilation network according to an air quantity balancing law, an air pressure balancing law and a resistance law; G. calculating the pressure of the ventilation network with amesh iteration correction air quantity method; and H. confirming the number of sets and standards of the fans according to the pressure increase and air quantity required by each ventilation segmentof the network. The method for ventilating double-hole tunnel network cancels the vertical ventilation well, greatly reduces the ventilation equipment and can greatly reduce the building cost and operation management cost.

The present invention discloses an improved rotary forced-air cooler, which comprises a double layer trolley, a supporting beam structure, a material blocking proof air duct sealing plate arranged at the connecting part of the double layer trolley and an air supplying system, a double layer trolley unit static seal device and an air duct device. The supplying system structure is based on a rectangular beam, a triangle beam is arranged on the rectangular beam, and a plurality of ventilation channels are arranged on the bevel edge steel plates at the both waists; an air duct pipe is arranged on the air vent of the material blocking proof air duct sealing plate, an inclined plate inclining upwards from the air vent at the bottom part of the air duct pipe has a transition to a horizontal plate, a stopping ventilation fence is added to the air duct pipe at the side of the trolley; two rubber sealing parts with extended bottom edges are arranged at the outer sides of the lower parts of inner and outer sealing plates of the double layer trolley unit static seal device, an ash baffle plate which can move up and down is hung at the inner side; an air water sealing wave subduing device adopting a damping plate is arranged on the air duct device. The present invention further improves the sealing performance of the equipment, and reduces energy consumption and pollution.

The invention discloses a method for ventilating a drainage tunnel of an extremely-long double-hole tunnel of an expressway during construction. Before a drainage transverse channel is opened at the initial stage of constructing the drainage tunnel, a requirement of ventilating the drainage tunnel is met during construction by a press-in ventilation method; after the drainage tunnel is forwards pushed, and drainage transverse channels are opened, fresh air in a flat pilot tunnel is pressed into a tunnel face of the drainage tunnel through an axial flow fan at the drainage transverse channel, which is closest to the tunnel face, of the flat pilot tunnel; a jet flow fan is arranged between the opening of the drainage tunnel and the last drainage transverse channel so as to introduce fresh air into the drainage tunnel; a jet flow fan is arranged in the last drainage transverse channel of an air outlet tunnel so as to introduce air from the opening of the drainage tunnel and the tunnel face into the air outlet tunnel, and the fresh air is discharged by the air outlet tunnel; most paths of the inlet and outlet air are respectively changed into the whole flat pilot tunnel of a main tunnel and the air outlet tunnel from the drainage tunnel; and the sections of the inlet and outlet air are increased, the resistance is reduced, the ventilation effect is good, the air quality of the drainage tunnel at various sections is good, the requirement for ventilation of the drainage tunnel of the extremely-long double-hole tunnel of the expressway during construction is met.

The invention provides a supporting system for a turbine part of a gas turbine engine. The supporting system comprises a bearing pedestal, a force bearing receiver and a plurality of force bearing supporting plates which are used for connecting the bearing pedestal and the force bearing receiver and are evenly distributed in the circumferential direction. Pneumatic blade type supporting plates are arranged outside the portions, located on an inner duct, of the force bearing supporting plates. The pneumatic blade type supporting plates are each of a cavity structure. The force bearing supporting plates are located in cavities of the pneumatic blade type supporting plates, and each pneumatic blade type supporting plate is provided with an air outlet. According to the supporting system, the portions, located in high-temperature and high-pressure gas, of the force bearing supporting plates are ingeniously provided with the pneumatic blade type supporting plates, and further, the pneumatic blade type supporting plates are arranged to be in the shape of wings; cooling gas coming from the inner cavities of the force bearing supporting plates can directly enter the pneumatic blade type supporting plates and has a cooling effect on the pneumatic blade type supporting plates; the inner sides and the outer sides of the force bearing supporting plates located in the inner cavities of the pneumatic blade type supporting plates are cooled; and besides, the pneumatic blade type supporting plates and gas located between the pneumatic blade type supporting plates and the force bearing supporting plates powerfully protect the force bearing supporting plates, and therefore the service life of the force bearing supporting plates is prolonged and the reliability of the force bearing supporting plates is improved.

The invention discloses a fresh air flow control device for a central air-conditioning system. Measurement signals of a fresh air CO2 concentration sensor (2), a fresh air flow sensor (3) in each air-conditioning region, an air supply flow sensor (6) and a return air CO2 concentration sensor (8) are electrically connected with a required fresh air flow setter (4). Measurement signals of the freshair flow sensor (3) and fresh air flow set value signals in each air-conditioning region of the required fresh air flow setter (4) are electrically connected with a fresh air flow controller (10) which is electrically connected with a control end of an electric air valve (9). The required fresh air flow setter is electrically connected with the fresh air flow controller, and the fresh air flow setvalue of the fresh air flow controller is set in real time. The fresh air controller adjusts opening of the electric air valve so that the fresh air flow measurement value is close to or reaches theset value, thereby the invention satisfies the requirements of indoor sanitary condition and ventilation in the air-conditioning regions, and reduces the energy consumption of buildings as well.

This invention discloses a venting noise insulation widow, which comprises a window frame fixed in the wall and a group of glass widow set in the frame, wherein the window frame including a garment frame set outside the wall and a core frame set inside the wall, and both the garment and core frame are set glass widow can be opened; between the garment and core glass widow forms the acoustic cavity, and a transparent acoustic element is arranged in it; the invention can be the sound lock mode and the resonant mode according to the requirement. Between the garment and core frame it can be set shade and heatproof curtain.

The invention discloses a comprehensive pipe gallery which comprises a pipeline cabin, a first tunnel escape, an air inlet passage and an air outlet passage arranged in the same direction, wherein a one-way fireproof door is arranged on one side, close to the first tunnel escape, of the pipeline cabin; a second tunnel escape is arranged between the one-way fireproof door and the first tunnel escape; an air inlet device is arranged between the air inlet passage and the pipeline cabin; and an air outlet device is arranged between the pipeline cabin and the air outlet passage. According to the invention, the first tunnel escape, the air inlet passage and the air outlet passage are arranged, the one-way fireproof door is arranged on one side, close to the first tunnel escape, of the pipeline cabin, and the second tunnel escape is arranged between the one-way fireproof door and the first tunnel escape, so that an escape safety system with whole-line arranged escape passages is formed, and the ventilation requirement that an escape exit and a ventilation opening penetrating through the ground can be arranged across a longer distance for an escape and natural gas pipeline cabin of an underground comprehensive pipe gallery is met.

The invention discloses a method for automatically converting a down-hole main and auxiliary machine ventilating system into a multi-stage machine station ventilating system. The method includes the following steps that 1, according to mine capacity planning, combined with an exploitation depth, a whole production stage is divided into two stages of an easy ventilating stage and a difficult ventilating stage; 2, simulation calculating is respectively conducted on ventilating networks of the easy ventilating stage and the difficult ventilating stage of a mine well; 3, the main and auxiliary fanventilating system is established when ventilating is easy; and 4, the multi-stage machine station ventilating system is established when ventilating is difficult. According to the method for automatically converting the down-hole main and auxiliary machine ventilating system into the multi-stage machine station ventilating system, the advantages that main and auxiliary fan ventilating is simplein management, and multi-stage machine station ventilating is low in energy consumption are fully combined, down-hole main and auxiliary fan ventilating is adopted in the easy ventilating stage, investment of engineering and machine equipment is saved, land acquisition is not needed, and ventilating management is convenient; a main machine of the easy ventilating stage is used as a II-type machinestation draught fan to relay during the difficult ventilating stage, the operation cost is low, and the effect of energy conservation is obvious; and the difficult problem that the difference of thewind pressure difference between the adjacent stages of the mine well ventilating systems is large is solved.

The invention discloses an experiment device for detecting the wind and sand resistance of a bridge support. The experiment device comprises a fan, a protecting chamber and a sand storage box and is characterized in that the wind outlet of the fan is in butt joint with a wind inlet arranged in one lateral wall of the protecting chamber, the sand outlet of the sand storage box is in butt joint with the sand inlet in the protecting chamber, the sand inlet is located in the top surface of the protecting chamber on the rear side of the wind inlet, and the protecting chamber is provided with a screen for discharging air and filtering sand; a support bearing platform is arranged inside the protecting chamber, a support test piece is fixedly placed at a position, directly facing the wind inlet, inside the protecting chamber through the support bearing platform, an inclined sand collecting plate is arranged between the lateral wall of the protecting chamber and the support bearing platform in a surrounding manner, and the lowest part of the sand collecting plate is in butt joint with a movable sand collecting box. The experiment device has the advantages that the sand work environment of the bridge support in the northwest region is simulated to predict the wind and sand resistance and failure time of the bridge support, and accordingly the structure of the bridge support can be further improved, the performance increasing of the bridge support is benefited, and a scientific basis is provided for the design and construction decisions of bridges in the northwest region.

The invention discloses a double-air-cylinder automatic regulation and control system for a downhole air window of a coal mine and a control method of the double-air-cylinder automatic regulation and control system. The double-air-cylinder automatic regulation and control system for the downhole air window of the coal mine comprises a signal acquisition system and a control and regulation system. The signal acquisition system comprises a wind speed sensor, a stay wire type displacement sensor and a programmable logic controller (PLC) sequentially connected with the stay wire type displacement sensor. The control and regulation system comprises an air window shutter gate, a movable shutter air window, a positioning air cylinder, a clutch locking nut, a power air cylinder, a first electromagnetic valve, a second electromagnetic valve, the PLC, an auxiliary element and an air source. According to the double-air-cylinder automatic regulation and control system for the downhole air window of the coal mine and the control method of the double-air-cylinder automatic regulation and control system, the air volume in a roadway can be monitored in real time, automatic and quantitative regulation of the ventilation area of the air window is achieved, and the absolute value of the air volume difference value Qmin+Qmax / 2-Q is used as an air volume regulation value, so that the problem that the regulation frequency of the air window is increased when Q-Qmin or Qmax-Q is used as the air volume regulation value is solved; the service life of equipment is prolonged, and the use efficiency of the equipment is improved; the cost is reduced, the ventilation requirement of downhole places with changeable air volumes is met, and the distribution of the downhole ventilation volume is effectively guaranteed.

The invention relates to a combined plane support disc which comprises a support plate and a support leg, wherein the back of support plate has longitudinal and horizontal convex strengthen bars; four edge of support plate are the convex strengthen bar independently, while the inner strengthen bars are grouped at each two one; the middle has the saw slit, to saw the support plate based needed size; the top and bottom end surfaces of support leg have compressed concave-convex grooves, to be mounted into the grooves of back plate formed by the strengthen bars; before mounting, coating adhesive on the end surface of concave-convex groove, and adjusting the number of support leg based on the load weight. Therefore, the support plate and support legs can form different single-surface or dual0surface combined support disk.

The invention relates to the technical field of cooling tower auxiliary equipment, in particular to a hydrodynamic wind power propulsion device and a cooling tower wind power system. The hydrodynamic wind power propulsion device comprises a shell, a water inlet, a water outlet, a fan and an impeller, a water collector is arranged in the shell, two ends of the water collector are hermetically connected with two ends of the shell in an extending manner respectively, a plurality of water inlet holes are uniformly arranged axially along the periphery of the water collector, the impeller is arranged in the water collector, the water inlet is arranged on the side wall of the shell, the water outlet is positioned on the shell below the impeller, the fan is arranged on the upper portion of the shell, and the impeller is coaxially connected with the fan. In the cooling tower wind power system, water flow can generate vortex by the aid of the water inlet holes to push the impeller to rotate, the impeller further drives the fan to rotate, and ventilation requirements are met. Therefore, water flow is circulated only by the aid of surplus power of a water pump in a cooling tower, the fan can rotate without additionally consuming electric energy, and accordingly, energy is saved.

The invention discloses an underground coal mine externally-hung type shutter air window and an adjusting system and method of the underground coal mine externally-hung type shutter air window and belongs to the technical field of mine air windows. An air window outer frame and an air window inner frame are of frame type structures, and the air window inner frame is embedded in the air window outer frame. A rotating shaft is fixed to each of the upper end and the lower end of each movable sash, wherein the rotating shaft is sleeved with a shaft sleeve and is connected with a rocking handle. Apneumatic control assembly is fixed to the middle of one side of the air window outer frame. Multiple movable sashes are distributed on the two sides, along the center line, in the air window inner frame at equal intervals, and the adjacent movable sashes are connected through the rocking handles. The pneumatic control assembly is connected with the rocking handles. The pneumatic control assemblyis further connected with a connecting rod mechanism. By means of the adjusting air widow, real-time automatic detection and adjustment are conducted on the air volume of a roadway, manual intervention is completely not needed in air volume adjustment, and in addition, accurate, fast and stable adjustment of the air volume can be achieved.

The invention discloses a heating, ventilating and air conditioning system of a low-floor light rail vehicle. The heating, ventilating and air conditioning system of the low-floor light rail vehicle comprises a first air supply and return unit arranged in a passenger room and a second air supply and return unit arranged in a cab. According to the first air supply and return unit, the air inflow and outflow mode that air is supplied from the two sides and returns from the middle is adopted for a top plate of a compartment. A second air supply duct of the second air supply and return unit winds through vehicle window side glass and front window glass, air inlets are formed in the front and the side of a console, and an air return port is formed in the vehicle ceiling of the cab. The heating, ventilating and air conditioning system can meet the requirements for heating, ventilating, refrigerating and heating of the low-floor vehicle and meet the requirements for ventilating and temperature of the passenger room and the cab, uniformity of air outflow of air supply ports and uniformity of temperature in indoor space are guaranteed, fresh air can run through the whole vehicle space, and the comfort requirement of passengers is met. What is the most important, no extra structural arrangement is added, and the total vehicle weight, the vehicle power consumption and the power will not be increased.

The invention discloses a variable air volume adjusting method and device for an exhaust hood of a laboratory. The adjusting method comprises the following steps: S1, an air volume Q1, which needs tobe exhausted from a ventilation pipe in the process in which a fully closed window of the exhaust hood is fully opened, is calculated, and a target air volume curve is drawn; S2, an exhaust valve is selected according to the target air volume curve and an effective stroke range of a valve element assembly of the exhaust valve when the exhaust valve is arranged; S3, an effective stroke L1 in the process in which the fully closed window of the exhaust hood is fully opened, an effective stroke L2 of the valve element assembly in the process in which the fully closed exhaust valve is fully opened,and a register ratio N are calculated; S4, the window of the exhaust hood moves to drive a linkage mechanism to move; and S5, the linkage mechanism drives the valve element assembly of the exhaust valve to move, so that a ventilation section area is changed, and an actual air volume is further changed. The method and device disclosed by the invention has the advantages that a mechanical linkage structure is adopted for adjustment, so that the transmission precision is high, and swiftness and high convenience are achieved.

The invention discloses an underground coal mine intelligent air window and an adjusting system and method thereof, and belongs to the technical field of mine air windows. The underground coal mine intelligent air window comprises a shutter air cabinet; the shutter air cabinet is of a cuboid rectangular structure and comprises a cabinet body, movable sashes and an arc-shaped air guiding plate; anair inlet and an air outlet are formed in the rear end of one side of the cabinet body correspondingly, and the multiple movable sashes are arranged at the air inlet; a pneumatic control assembly controlling the opening angles of the movable sashes is mounted on one side of the air inlet, and an angle sensor detecting the opening angles of the movable sashes is further mounted on one side of the air inlet; and the arc-shaped air guiding plate is fixed into the cabinet body. It is proposed for the first time that the pneumatic control assembly is adopted, compressed air serves as power to adjust the angles of the movable sashes of the shutter air window, thus the air passing section is quickly and accurately adjusted, the situation that the air window area is changed due to misoperation ofnon-ventilation personnel can be prevented, and the air volume is reliably controlled.

The invention discloses a method for ventilating a drainage tunnel of an extremely-long double-hole tunnel of an expressway during construction. Before a drainage transverse channel is opened at the initial stage of constructing the drainage tunnel, a requirement of ventilating the drainage tunnel is met during construction by a press-in ventilation method; after the drainage tunnel is forwards pushed, and drainage transverse channels are opened, fresh air in a flat pilot tunnel is pressed into a tunnel face of the drainage tunnel through an axial flow fan at the drainage transverse channel, which is closest to the tunnel face, of the flat pilot tunnel; a jet flow fan is arranged between the opening of the drainage tunnel and the last drainage transverse channel so as to introduce fresh air into the drainage tunnel; a jet flow fan is arranged in the last drainage transverse channel of an air outlet tunnel so as to introduce air from the opening of the drainage tunnel and the tunnel face into the air outlet tunnel, and the fresh air is discharged by the air outlet tunnel; most paths of the inlet and outlet air are respectively changed into the whole flat pilot tunnel of a main tunnel and the air outlet tunnel from the drainage tunnel; and the sections of the inlet and outlet air are increased, the resistance is reduced, the ventilation effect is good, the air quality of the drainage tunnel at various sections is good, the requirement for ventilation of the drainage tunnel of the extremely-long double-hole tunnel of the expressway during construction is met.

The invention relates to a device and method for achieving tunnel stepless ventilation through a wind power technology. The device comprises a wind power generation unit and a stepless ventilation speed regulation unit. The wind power generation unit is provided with a wind driven generator used for converting wind power at the windy position of a tunnel zone into electric energy and a storage battery connected with the wind driven generator; and the stepless ventilation speed regulation unit is connected with the storage battery and provided with a plurality of jet fans used for tunnel ventilation, a temperature and humidity sensor used for monitoring and transmitting air condition data in a tunnel in real time, an infrared vehicle detector, a CO sensor and a frequency conversion controller used for receiving the air condition data in the tunnel and controlling the air supply amount of the jet fans. Compared with the prior art, the air supply amount can be changed in real time according to the air condition in the tunnel, compared with traditional fixed wind speed, more energy can be saved, and the device can adapt to more complex environments in the tunnel.

The invention discloses a shielding ventilating window. The shielding ventilating window comprises a shutter on a box shell. A cellular shielding ventilating window is arranged at a position corresponding to the shutter in an inner side of the box shell. A shielding window periphery is welded on the box shell through a stainless steel plate. In the invention, a ventilation requirement of a electric appliance cabinet can be satisfied and simultaneously the shielding window is arranged behind the shutter, and seal treatment is performed to a connection part of the shielding window and the box shell. Interference of electromagnetic radiation to other external equipment through the shutter can be shielded. The electromagnetic radiation can be eliminated as much as possible and influence is reduced.

The invention discloses an anti-explosive valve which is formed by unit valve bodies (1) combined together. The surface of each unit valve body (1) is provided with an air outlet (2); a bottom plate (3) is arranged in the unit valve body (1); a slide block (4) is arranged on the bottom plate (3); and the slide block is elastically connected with the bottom plate (3). With the structure, the invention can prevent explosive shock waves from entering the inside of a building from the air outlet while meeting the requirement of ventilation, thereby protecting indoor people and equipment.

The invention discloses an energy-saving lighting, ventilating and rain-proof louver. The technical problems to be solved are as follows: conventional louvers basically have ventilation and decorationfunctions, and play a certain role in shielding, but more importantly, the conventional louvers play a role of being rainproof; general louvers can only add louver blades to prevent rain, but ventilation requirements cannot be met; and in addition, the inner sides of ventilating and rain-proof louvers are lightproof, so that indoor lights need to be turned on all year round. To solve the technical problems, the adopted technical schemes are as follows: The louver adopts a louver with double layers; the external louver is inlaid with a novel transparent material; the internal louver has louverblades which can automatically open and close; the external louver and the internal louver are in inverted-V-shaped arrangement; the external louver can realize the first waterproof and lighting function; and the internal louver is in lap joint with the external louver and has multiple groove shapes, so that rainwater-blocking and draining can be achieved, the second waterproof can be realized, and light transmission cannot be influenced. Especially in the case of strong wind and heavy rain, the open-close blades of the internal louver blades can be automatically opened under the action of wind power, so that the strong wind and heavy rain can be effectively stopped, and high-performance requirements of ventilation and rain-proof under harsh environments.

The invention discloses a ventilation layout method of an intensive cultivation workshop. The main structure comprises main fans, an air inlet rectangular air pipe, a fresh air spiral air pipe, an airreturn rectangular air pipe, an air exhaust rectangular air pipe and a gas detection device. According to the ventilation layout method, ventilation is carried out through fan parallel connection andthe stretching-in manner, the air supply amount is increased, air supply and air exhaust are balanced, and the ventilation requirement of the sealed cultivation workshop needing a wide range is met.

The invention discloses a portable external cold and heat source type air-conditioner working table which comprises a working table body. Different from the prior art, the working table further comprises air blowers and external cold and heat source working media, wherein the air blowers are arranged on a table board of the working table body and below the table board of the working table body correspondingly; the external cold and heat source media enter heat exchangers in the air blowers through a cold and hot working medium inlet / outlet correspondingly; extension pipes of the heat exchangers are provided with solenoid valves connected with a controller; the controller is used for controlling the cold and hot working media in the upper heat exchanger and the lower heat exchanger to flow and controlling draught fans in the air blowers to run. The working table can supply air at a short distance and meet the different requirements of people for ventilation air conditioners, and is capable of saving energy, sanitary, small in size and convenient to move.

The invention discloses a rainy day automatic window closing control system which comprises a raindrop induction device, a vehicle window opening and closing device, and a control device; the output end of the raindrop induction device is connected with the control device; the control device is connected with the vehicle window opening and closing device; the system further comprises a living bodydetection device, a vehicle state detection module, and a vehicle window state detection module; the vehicle state detection module sends a detected vehicle flameout signal to the control device; theliving body detection device is used for sending a detected signal that whether living objects exist in a vehicle or not to the control device; the vehicle window state detection module is used for sending the detected vehicle window and skylight opening and closing states of the vehicle to the control device; and the control device is used for controlling the vehicle window opening and closing device to open and close a vehicle window according to the received raindrop signal, the living object signal, the vehicle state and the vehicle window state. The rainy day automatic window closing control system is simple and reliable, the system risk of automatic window closing possibly caused in the prior art can be effectively avoided, and theft can be effectively avoided.

The invention discloses an automatic ventilation method for an anechoic chamber. The method comprises the following steps of: providing a limit switch for detecting the opening and closing state of an access door of the anechoic chamber; providing an air quality detector for detecting the air quality in the anechoic chamber; and providing a ventilation system, and selectively opening or closing the ventilation system according to the opening and closing state of the access door and the air quality in the anechoic chamber. Therefore, the method can meet the requirement for ventilation of the anechoic chamber, and can also well meet the basic requirement of acoustic test.

The invention discloses a wind axial flow fan, in particular to an exhaust (or air supply) equipment suitable for the ventilation and exhaustion tower in tunnel environments such as road and railway, etc. The technical problem to be solved is that the invention provides the device which utilizes the natural wind energy out of the tunnel to carry out ventilation to the tunnel. The technical proposal adopted by the invention is that the ventilation tower wind axial flow fan is provided with a wind machine out of the ventilation tower of the tunnel; the wind machine is connected with the axial flow fan which is arranged in the ventilation tower by an equipment bracket. The ventilation equipment adopting the invention can convert the outdoor natural wind into axial mechanical motion by the wind machine, which directly drives the axial flow fan on the top of the ventilation tower without going through other energy conversion and accessorially supplements the existing mechanical ventilation driving the fan with power in the tunnel. The equipment sufficiently utilizes renewable energy source, saves the necessary power required by tunnel ventilation, and effectively reduces the operation cost of the tunnel.

The invention discloses a coal mine inclined shaft standby explosion door device. The standby explosion door device comprises a concrete box body, a door leaf, a window sash, first electric push rod mechanisms and a first support, wherein the front end of the concrete box body is provided with an outlet capable of directly facing an inclined shaft explosion door, a rigid door frame is formed on the periphery of the outlet, the upper side edge of the door leaf is hinged to the upper side edge of the rigid door frame, the door leaf can cover the front portion of the outlet and obtain supporting force through the rigid door frame, a pressure relief window is formed in the door leaf, the upper side edge of the window sash is hinged to the upper edge of the pressure relief window, the window sash covers the front portion of the pressure relief window and obtains supporting force through the edge of the pressure relief window, the first electric push rod mechanism is installed on the first support, when push rods of the first electric push rod mechanisms extend backwards, the door leaf can be supported, and the outlet is completely opened. When the standby explosion door device is uses, the device covers an inclined shaft body protruding out of the ground and the inclined shaft explosion door, the standby explosion door is used for quickly resetting to close a channel after primary explosion occurs underground, and normal pressure relief and resetting can be realized when multiple explosions occur underground.

The invention relates to a flow splitting hole stove grate and a hot-air stove lattice brick supporting system. The flow splitting hole stove grate comprises a stove grate body which is integrally molded by casting, the stove grate body is divided into an upper segment, a middle segment and a lower segment in the height direction, a plurality of small holes are evenly distributed in the upper segment, wherein any 3 adjacent small holes are all arranged in equilateral triangles, every 3 adjacent holes are taken as one set to evenly form a plurality of hole sets, the middle segment and the lowersegment of each hole set are provided with a large hole, and the bottoms of the 3 small holes of each hole set communicate with the top of the corresponding large hole through inclined holes. According to the flow splitting hole stove grate, the small holes of the upper segment is used for being matched with ventilating lattice holes in lattice bricks, the large holes are adopted for the middle segment and the lower segment to increase the thickness of hole walls, so that ventilation requirements and strength requirements are met at the same time.

The invention discloses a sound insulation cover, comprising a cover body outside a sound source device. The cover is composed of a shell and a sound absorption layer connected to the inner wall of the shell, and the cover body is connected with the sound source device by a vibration isolator; a through hole is opened in the cover body; and a muffling structure, namely a muffling pipe, is mounted in the through hole, and a muffling material is lined on the inner wall of the muffling pipe. The sound insulation cover is characterized in that a ventilation muffler is mounted on the top of the sound insulation cover, and a muffling heat-dissipation hole in a rectangular bent shape is formed in one side surface of the sound insulation cover. The sound insulation cover has the advantages of being capable of effectively reducing noises, and being easy to assemble and disassemble and high in practicality.