CN111271324B

CN111271324B - Low-flow-resistance pre-rotation phase silencer and design method

Info

Publication number: CN111271324B
Application number: CN202010187595.1A
Authority: CN
Inventors: 刘燕潇; 邵准远; 张立平; 胡伟锋; 赵林
Original assignee: Zhejiang Shangfeng Hi Tech Specialized Wind Industrial Co ltd
Current assignee: Zhejiang Shangfeng Hi Tech Specialized Wind Industrial Co ltd
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2021-06-11
Anticipated expiration: 2040-03-17
Also published as: CN111271324A

Abstract

The invention discloses a low-flow-resistance prerotation phase silencer, which comprises an outer barrel and a porous plate arranged in the outer barrel, wherein the porous plate surrounds a plurality of flow channels in the outer barrel, and a silencing material is filled between the internal flow channels and the outer barrel; the inlet and the outlet of the internal flow passage are staggered; compared with the silencer with disordered internal flow, such as a sheet type silencer, a honeycomb type silencer, a labyrinth type silencer and the like, the silencer with disordered internal flow has the advantages that the flow channel in the silencer with low flow resistance and pre-rotation phase is smooth, the airflow flow is uniform and controllable, the airflow turbulent vortex capacity is weak, the flow efficiency is high, the angular direction of the pre-rotation airflow of the airflow is matched with the installation angle of the inlet blade in the impeller, and the pneumatic performance of equipment such as a fan and the like can be improved.

Description

Low-flow-resistance pre-rotation phase silencer and design method

Technical Field

The invention belongs to the technical field of silencers, and particularly relates to a low-flow-resistance pre-rotation phase silencer and a design method.

Background

Noise is an irregular combination of sound waves of various frequencies and intensities. Noise affects human hearing, cardiovascular diseases and nervous system functions, and reducing noise pollution has great significance for social and economic development. As an effective muffler device, a muffler is widely used for noise control of intake and exhaust of fluid machinery, ventilation ducts, generators, and the like. The silencer can eliminate noise and simultaneously has gas circulation inside. The silencer comprises a resistive silencer, a reactive silencer and an impedance composite silencer, wherein the resistive silencer utilizes the sound absorption effect of sound absorption materials to reduce noise, has a good silencing effect on the noise in a medium-high frequency range, and is suitable for fluid mechanical equipment such as a fan.

The existing straight pipe type silencer has the advantages that the straight pipe type silencer is straight, a vertical noise source and a silencer inlet are straight, the silencing quantity is low, if the straight pipe type silencer needs to have good silencing quantity, the silencer is long in pipe, large in space, high in cost and not allowed in the use field. For the sheet type, honeycomb type, labyrinth type and other mufflers with a plurality of muffling cavities arranged inside the muffler for increasing the muffling area, although the muffling area is improved, the flow area is reduced, the air flow speed is high, the flow field is disordered, the regeneration noise is high, and the flow loss of the muffler is high. Meanwhile, if the silencer is used for rotating mechanical equipment such as a fan, the outlet of the silencer is the inlet end of the fan, and the airflow speed distribution at the position has an influence on the airflow angle at the inlet of the fan, so that the equipment performance is seriously influenced.

Disclosure of Invention

The invention provides a low-flow-resistance pre-rotation phase silencer and a design method in order to overcome the defects of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: a low flow resistance prerotation phase silencer comprises an outer barrel and a porous plate arranged in the outer barrel, wherein the porous plate surrounds a plurality of flow channels in the outer barrel, and a silencing material is filled between the inner flow channels and the outer barrel; the inlet and the outlet of the internal flow passage are staggered; the silencer is installed and connected with equipment such as a fan and the like, when the silencer is used as a silencer at the inlet of the fan, the air inlet side of the silencer faces a noise receiver, and the air outlet side of the silencer is connected with noise source equipment such as the fan and the like; the flow area of the air inlet side is large, and the flow area of the air outlet side is relatively small; the air inlet side has large flow area, so that the air flow speed of the noise receiver can be effectively reduced, and the noise is reduced; the flow area of the air outlet side is small, the noise elimination amount of the silencer can be effectively improved, and even if the regenerative noise is slightly improved, the propagation is inhibited through the phase action of the flow channel; the inlet and the outlet are arranged in a phase manner, the effective silencing area in a silencer flow passage is enlarged, the length of a flow path is lengthened, and compared with a straight-through silencer, the flow passage of a pre-rotation phase silencer is prolonged by 1.7-3 times, so that the silencing effect is improved; compare in this kind of chaotic silencer of internal flow such as piece formula, honeycomb, labyrinth, the inside runner of low flow resistance prewhirl phase place silencer is smooth, and airflow flow is even controllable, and airflow turbulence vortex ability is weak, and flow efficiency is high, and the prewhirl air current angular direction of air current matches with the interior entry blade mounting angle of impeller, can promote equipment aerodynamic performance such as fan.

The thickness of the silencing material is 50-100 mm.

If the silencer is used for rotating mechanical equipment such as a fan, the flow, the number of blades, the rotating speed and other factors of the fan have great influence on the silencing effect of the silencer, and the silencer cannot meet the silencing work of the fan, and the silencer is processed by adopting the following processing method according to the problems:

a design method of a low-flow-resistance pre-rotation phase muffler comprises the following steps:

step1, calculating and evaluating the fundamental frequency noise frequency of the noise source according to the rotating speed and the number of blades of the fan rotating equipment, and evaluating the frequency range of the noise source;

wherein n is the rotation speed in rpm; z is the number of leaves; i is the frequency order; f is frequency

The rate is in Hz;

step2, calculating the sound pressure level of the noise source according to the designed input air volume, air pressure and the sound value of the ratio A, and evaluating the sound level of the noise source;

La＝10lg(QP²)-19.8+LSA

where La is the A sound level in dB (A); q is the fan flow in m³H; p is pressure in Pa; LSA is the specific A sound level in dB;

step3, designing the inlet flow area of the low-flow-resistance pre-rotation phase muffler, controlling the average speed of the inlet section within a reasonable range according to the flow, and inhibiting the generation of regenerative noise; designing the shape of an inlet through flow port and the thickness of silencing cotton between flow channels, wherein the preferred thickness of the silencing cotton is 50-100 mm;

step4, designing the outlet flow area and the shape of the low-flow-resistance pre-rotation phase silencer, wherein the outlet section is circular, selecting the integral length of the silencer, calculating the length of a flow passage, and calculating the integral noise elimination quantity;

delta L is the calculated noise elimination quantity, and the unit is dB; phi is a_αCoefficient of sound attenuation of material, preferably phi_αDesigned to be 1-1.5; beta is a_pThe circumferential tortuosity coefficient of the through-flow section; beta is a_LPreferred is beta for the length of the flow and the coefficient of tortuosity_LDesigned to be 1.7-3; the perimeter of the P through-flow section is m; l muffler length in m; s is the flow cross-sectional area, and the unit is m 2;

step5, evaluating whether an expected noise reduction target is achieved according to the sound level A of the noise source and the calculated noise reduction amount of the silencer; if not, returning to Step3, readjusting the design method of the silencer, adjusting the length of the silencer, the number of runners and the phase pre-rotation angle, and recalculating the silencing quantity;

step6, meeting the requirements and outputting a design method;

step7, selecting a proper plate, placing the plate on a punching machine, and finishing punching treatment on the plate according to a calculation result to obtain a porous plate;

step8, selecting a proper plate material to be placed on a steel plate forming machine, and finishing the forming Step of the outer cylinder according to the calculation result;

step9, welding the porous plate on the inner wall of the outer cylinder according to the calculation structure to complete the assembly of the silencer;

through the calculation to muffler urceolus and runner, do control to each item numerical value of muffler urceolus and runner, so that make the silencer of different grade type to the fan of various different models, guarantee that the silencer all has outstanding noise elimination effect to the fan of multiple model, through the calculation to runner length, need not to do the change to the runner shape, make the inside runner of phase place silencer smooth, it is even controllable to guarantee the air current flow, reduce air current torrent vortex ability, it is efficient to promote the air current flow, the preswirl air flow angle direction that makes the air current matches with the interior entry blade mounting angle of impeller, promote the aerodynamic performance of fan.

The perforating machine comprises a processing table and a mounting plate arranged above the processing table, wherein a hydraulic cylinder is arranged at the top of the mounting plate, a positioning groove is arranged on the processing table, a first movable groove matched with the positioning groove is arranged on the mounting plate, a first movable block is arranged in the first movable groove, first connecting plates are respectively arranged on two sides of the mounting plate, and a driving motor used for driving the first movable block to move is arranged on each first connecting plate; the first movable block is provided with a plurality of first through cavities, first installation blocks capable of moving up and down are arranged in the first through cavities, second through cavities are arranged on the first installation blocks, second installation blocks are arranged in the second through cavities and can move along the inner walls of the second through cavities, drilling cutters are arranged at the bottoms of the second installation blocks, and connecting rings matched with the drilling cutters are arranged at the bottoms of the second installation blocks; after the design method is formed, placing steel in the positioning groove, adjusting the position of the second mounting block according to the design method, driving the mounting plate to move downwards by the hydraulic cylinder, driving the drilling knife to move downwards by the mounting plate, enabling the drilling knife to be in contact with the steel in the positioning groove, and punching a through hole in the steel; and then, the driving motor drives the first movable block to move in the first movable groove, the first movable block drives the mounting plate to move downwards after moving to a position, a through hole is punched in the whole steel, and the steel is processed.

The position of the drilling cutters is adjusted by moving the second mounting block, so that the relative distance between the two drilling cutters is changed as required, the distance between the drilling cutters is adjusted after an actual data scheme is calculated, and through holes meeting the numerical value of the scheme are machined in steel so as to meet the requirement of the scheme of not passing through the distance between the through holes; under the arrangement of the first mounting blocks, one of the two adjacent first mounting blocks can move upwards according to production requirements, the distance between the holes is adjusted to be double, the hole distance is adjusted greatly, and the application range of the perforating machine is enlarged; the drilling knife is connected to the second mounting block through the connecting ring so as to be convenient to replace, a through hole which meets the scheme is punched on the steel, and meanwhile, the punching effect of the drilling knife on the steel is guaranteed; under the mutual cooperation of the first movable groove and the first movable block, the punching machine can complete partial punching of steel and can also complete punching operation of the whole steel, and the application range of the punching machine is further widened.

A second movable groove and a third movable groove are arranged at the bottom of the positioning groove, the second movable groove and the third movable groove are respectively arranged at two ends of the positioning groove, a first supporting rod is arranged in the second movable groove, a first supporting spring is arranged at the bottom of the first supporting rod, a second supporting rod is arranged in the third movable groove, and a second supporting spring is arranged at the bottom of the second supporting rod; a fourth movable groove is formed in one side of the second movable groove, a first through hole is formed in the top of the fourth movable groove, a first movable cavity is formed in the first supporting rod, a third supporting rod is arranged in the first movable cavity, a first supporting plate is arranged on the third supporting rod, and when the mounting plate moves upwards, the first supporting plate moves upwards; when steel is processed, the steel is placed in the positioning groove, the first supporting rod and the second supporting rod are pressed downwards by the steel, the steel is embedded into the positioning groove, the mounting plate is driven by the hydraulic cylinder to move downwards, the drilling knife abuts against the steel to complete the drilling operation of the steel, the gravity of the steel after the drilling is smaller than the elastic force of the supporting spring, the supporting spring pushes the steel to move upwards, the steel is pushed out of the positioning groove, the mounting plate moves upwards to drive the third supporting rod to move upwards, the first supporting plate pushes one end of the steel to rise, the steel slides down from the processing table after forming an inclined plane, and the material collection of the steel is completed; the first supporting rod and the second supporting rod are pushed into the bottoms of the second movable groove and the third movable eraser by the aid of the self gravity of steel, so that the steel is normally embedded in the positioning groove, a steel plate is fixed conveniently, and the punching effect of the steel plate is guaranteed; after the punching of the steel plate is finished, the weight of the steel plate is reduced due to the formation of holes, the first supporting spring and the second supporting spring push the first supporting rod and the second supporting rod to move upwards, and the steel plate is pushed out from the positioning groove so as to be collected; after the steel sheet rises from the constant head tank, drive the up-going motion of third bracing piece under the mounting panel effect, the steel sheet forms the inclined plane under first backup pad effect, and the steel sheet is automatic from the processing bench landing under the action of gravity, is automatic collection to the steel sheet, and the degree of difficulty is collected to further reduction steel sheet.

A positioning frame is arranged on the first connecting plate, a second movable block is arranged in the positioning frame, a convex strip is arranged on the first connecting plate, and a first groove matched with the convex strip is arranged on the second movable block; a second movable cavity is arranged on the second movable block, an equipment cavity is arranged on one side of the second movable cavity, an electric first push rod is arranged in the equipment cavity, a movable plate is arranged on a piston rod of the electric first push rod, a first connecting rod and a second connecting rod are respectively arranged on the side walls of two sides of the movable plate, a third movable cavity matched with the first connecting rod is arranged on the inner wall of the second movable cavity, and a connecting hole matched with the second connecting rod is formed in the first movable block; after the design method is formed, the position of a second mounting block is adjusted, a hydraulic cylinder drives the mounting plate to move downwards, a drilling knife punches a through hole in steel, an electric first push rod pushes a movable plate to move forwards, a second connecting rod pushes a first movable block to move forwards, the first movable block is pushed to the other side of a first movable groove, the hydraulic cylinder drives the mounting plate to move downwards again, the drilling knife is contacted with the steel again, the through hole is punched in the other position of the steel, a driving motor drives the second movable block to move, the first movable block moves along with the second movable block, the hydraulic cylinder drives the mounting plate to move downwards after the first movable block moves, and the drilling treatment is completed on the whole steel; the first lug and the positioning frame are matched with each other to fix the second movable block, and the second movable block is fixed on the first connecting plate, so that the matching effect of the first movable block and the second movable block is ensured; when the electric first push rod and the driving motor are matched with each other, power is provided for the movement of the first movable block in the first movable groove, so that the first movable block can normally move in the first movable groove, the processing treatment can be conveniently carried out on steel materials according to the requirement, and the application range of the perforating machine is widened; the first connecting rod and the third movable cavity are matched with each other, so that the supporting effect of the movable plate on the first movable block is ensured, and the use reliability of the equipment is improved; the mode through setting up the second movable block respectively in the both sides of mounting panel makes first movable block can move to on every position of first movable groove to do the processing to the monoblock steel in the constant head tank.

The invention has the following advantages: compared with the silencer with disordered internal flow, such as a sheet type silencer, a honeycomb type silencer, a labyrinth type silencer and the like, the silencer with disordered internal flow has the advantages that the flow channel in the silencer with low flow resistance and pre-rotation phase is smooth, the airflow flow is uniform and controllable, the airflow turbulent vortex capacity is weak, the flow efficiency is high, the angular direction of the pre-rotation airflow of the airflow is matched with the installation angle of the inlet blade in the impeller, and the pneumatic performance of equipment such as a fan and the like can be improved.

Drawings

FIG. 1 is a schematic cross-sectional view of an inlet/outlet flow passage of a muffler of the present invention.

FIG. 2 is a first schematic view of the muffler of the present invention connected to a fan and the impeller inlet pre-rotation.

FIG. 3 is a second schematic view of the connection of the silencer and the blower and the pre-rotation of the impeller inlet according to the present invention.

Fig. 4 is a schematic view of the structure of the punch of the present invention.

Fig. 5 is a front view of the punch of the present invention.

Fig. 6 is a cross-sectional view taken along a-a in fig. 5.

Fig. 7 is a cross-sectional view taken along line B-B of fig. 5.

Fig. 8 is an enlarged view of fig. 7 at a.

Fig. 9 is an enlarged view of fig. 7 at B.

Fig. 10 is a cross-sectional view taken along J-J in fig. 5.

Fig. 11 is a right side view of the punch of the present invention.

Fig. 12 is a cross-sectional view taken along line C-C of fig. 11.

Fig. 13 is a cross-sectional view taken along line D-D of fig. 11.

Fig. 14 is an enlarged view of fig. 13 at C.

Fig. 15 is an enlarged view of fig. 13 at D.

Fig. 16 is an enlarged view at E in fig. 15.

Fig. 17 is a cross-sectional view taken along line E-E of fig. 11.

Fig. 18 is an enlarged view of fig. 17 at F.

Fig. 19 is a cross-sectional view taken along line I-I of fig. 11.

Fig. 20 is an enlarged view at G in fig. 19.

Fig. 21 is a cross-sectional view taken along F-F in fig. 11.

Fig. 22 is an enlarged view of fig. 21 at H.

Detailed Description

The utility model provides a low flow resistance prewhirl phase place silencer, includes urceolus 50 and locates the perforated plate in the urceolus, its characterized in that: the perforated plate encloses a plurality of internal flow passages in the outer cylinder 50, and a sound attenuation material is filled between the internal flow passages and the outer cylinder 50; the inlet and the outlet of the internal flow passage are staggered by one or a plurality of phases.

The air volume is 50000m³The low flow resistance prerotation phase silencer matched with the large air volume centrifugal blower with 13000pa pressure, 3000rpm rotation speed and 16 blade number is described as an example.

The centrifugal impeller and the volute are main pneumatic components in the centrifugal blower, pneumatic noise, mechanical noise and electromagnetic noise are generated in the centrifugal blower, and the pneumatic noise is a main noise source for the blower. The pneumatic noise source can be summarized as a monopole source, a dipole source and a quadrupole source, the main noise of the fan is the dipole noise generated by the interaction of gas and solid, and the middle-high frequency noise needs to be controlled due to high rotating speed.

The application provides a design method of a low flow resistance prerotation phase silencer, which comprises the following steps:

The rate is in Hz;

La＝10lg(QP²)-19.8+LSA

where La is the A sound level in dB (A); q is the fan flow in m³H; p is pressure in Pa; LSA is the sound value of ratio A, and the unit is dB;

step6, meeting the requirements and outputting a design method;

13000pa of the fan, 3000rpm of rotating speed, 16 blades, fundamental frequency noise of the fan is:

wherein n is the fan speed, ZThe number of blades is shown, i is the frequency order, when i is 1, the frequency is the fundamental frequency, the fundamental frequency of the blower is 800Hz, the second-order frequency is 1600Hz, and the blower belongs to medium-high frequency noise. The orifice plate silencer can effectively inhibit noise transmission. The fan air volume is 50000m³The flow rate is large, and therefore, a sufficient flow area is secured to control the flow velocity and suppress the generation of regenerative noise.

If the ratio A sound of the fan is 25dB, then the A sound level produced by the fan is:

La＝10lg(QP²)-19.8+LSA＝10lg(50000×13000²)-19.8+25＝144.5

where La is the A sound level in dB (A); q is the fan flow in m³H; p is pressure in Pa; LSA is the specific A sound level in dB. The sound level A of the fan is large, and the fan belongs to medium and high frequencies and is harsh. The outlet of the silencer is the inlet end of the fan, and the airflow speed distribution at the position has an influence on the inlet airflow angle of the fan, so that the equipment performance is seriously influenced. Therefore, the silencer is required to eliminate medium-high frequency noise, has low regeneration noise, good noise reduction effect, small volume, low flow resistance and airflow prerotation effect, and improves the pneumatic performance of the fan.

The inlet section side of the low-flow-resistance pre-rotation phase silencer faces a noise receiver, and the outlet section side is connected with an inlet of a blower. The scheme is that a plurality of runners are arranged in the silencer, the cross section of an inlet runner is in a triangular circle shape, and the triangular circle shape can effectively increase the inlet flow area, reduce the air flow speed and control the regeneration noise; the thickness between the flow channel and between the flow channel and the outer cylinder is the optimal thickness of the silencing cotton, and is preferably controlled to be 50-100 mm; the outer cylinder is in a circle matched with the blower, or in other shapes except the circle, such as a square shape and the like, the diameter of the outer cylinder is preferably 1000mm, and the length of the outer cylinder is preferably 1000 mm; the silencer export is circular, reduces the through-flow area, can effectively promote the noise elimination volume of silencer, even the regenerated noise promotes slightly, also suppresses the propagation through the phase action of runner, and the circular diameter of export of this scheme is preferred chooses 300 mm.

The flow channel structure of the low-flow-resistance pre-rotation phase muffler is shown in fig. 1, wherein 10,20,30 and 40 in fig. 1 are inlet section flow channel cross-section graphs (triangular circles); a, b, c and d are cross-sectional graphs (circles) of the flow channels of the outlet sections; the inlet runner port and the outlet runner port are staggered by a phase; when the rotation direction is anticlockwise, 10 is communicated with b, 20 is communicated with c, 30 is communicated with d, and 40 is communicated with a; clockwise, 10 is connected with d,20 is connected with a,30 is connected with b, and 40 is connected with c; the inlet section and the outlet section are in transition through a linear difference or a function; the inlet and the outlet are arranged in a phase manner, the effective silencing area in a silencer flow passage is enlarged, the length of a flow path is lengthened, and compared with a straight-through silencer, the flow passage of a pre-rotation phase silencer is prolonged by 1.7-3 times, so that the silencing effect is improved; compared with the silencer with disordered internal flow, such as a sheet type silencer, a honeycomb silencer, a labyrinth silencer and the like, the silencer with the low flow resistance and the prerotation phase has the advantages of smooth flow channel, uniform and controllable airflow flow, weak airflow turbulent vortex capacity and high flow efficiency.

The airflow prerotation direction of the low-flow-resistance prerotation phase silencer is matched with the installation angle of the inlet blade in the impeller, and as shown in figures 2 and 3, the rotation direction of airflow entering the impeller is required to be anticlockwise prerotation, so that the scheme adopts anticlockwise flow channel arrangement to improve the pneumatic performance of a blower; the low flow resistance prerotation phase silencer with the same inlet and outlet cross sections and the low flow resistance prerotation phase silencer with the square outer cylinder are also in a protection range.

As shown in fig. 4-22, the hole punching machine includes a processing table 1 and a mounting plate 2 disposed above the processing table 1, a hydraulic cylinder 22 is disposed on the top of the mounting plate 2, a positioning groove is disposed on the processing table 1, a first movable groove matched with the positioning groove is disposed on the mounting plate 2, a first movable block 3 is disposed in the first movable groove, first connecting plates 23 are disposed on two sides of the mounting plate 2, and a driving motor 25 for driving the first movable block 3 to move is disposed on the first connecting plates 23; the first movable block 3 is provided with a plurality of first through cavities, a first mounting block 31 capable of moving up and down is arranged in each first through cavity, a second through cavity is arranged on each first mounting block 31, a second mounting block 32 is arranged in each second through cavity, each second mounting block 32 can move along the inner wall of each second through cavity, a drilling cutter 33 is arranged at the bottom of each second mounting block 32, a connecting ring matched with the drilling cutter 33 is arranged at the bottom of each second mounting block 32, and the drilling cutters are connected with the connecting rings through threads; after the design method is formed, steel is placed in the positioning groove, the position of the second mounting block 32 is adjusted according to the design method, the hydraulic cylinder 22 drives the mounting plate 2 to move downwards, the mounting plate 2 drives the drilling knife 33 to move downwards, the drilling knife 33 is in contact with the steel in the positioning groove, and a through hole is drilled in the steel; and then the driving motor 25 drives the first movable block 3 to move in the first movable groove, and the hydraulic cylinder 22 drives the mounting plate 2 to move downwards after the first movable block 3 moves to one position, so that a through hole is punched in the whole piece of steel, and the steel is processed.

A first sliding groove is formed in the inner wall of the first through cavity, limiting grooves are formed in the top end and the bottom end of the first sliding groove respectively, a first sliding block matched with the first sliding groove is arranged on the side wall of the first installation block, a fifth movable groove is formed in the first sliding block, a first limiting block 316 matched with the limiting grooves is arranged in the fifth movable groove, a fourth movable cavity communicated with the fifth movable groove is arranged on one side of the fifth movable groove, a connecting block 313 is arranged on the first limiting block and penetrates through the fourth movable cavity, a third connecting rod 314 is hinged to the connecting block, a first push rod 312 is arranged at the top of the fourth movable cavity in a penetrating mode, the other end of the third connecting rod is hinged to the bottom of the first push rod, and a first reset spring 315 is arranged at the bottom of the first; when the drilling cutter is used, the first mounting block is pushed downwards, the first sliding block moves to the bottom end of the first sliding groove, the first push rod is pushed downwards, the first push rod pushes the third connecting rod to rotate around the connecting point, the third connecting rod pushes the first limiting block to move towards the outer side of the fifth movable groove, and the first limiting block is embedded into the limiting groove at the bottom of the first sliding groove and plays a role in fixing the first mounting block so as to enable the drilling cutter to be in contact with steel; when the drilling knife at a certain position is not used, the first mounting block is pushed upwards, the first sliding block moves to the top end of the first sliding groove, the first push rod is pushed downwards, the first limiting block is embedded into the limiting groove at the top end of the first sliding groove, the drilling knife is located in the first through cavity, the drilling knife at the relative position is not in contact with steel when the mounting plate descends, the through hole drilled by the drilling knife is controlled, and the application range of the perforating machine is enlarged.

A sixth movable groove is formed in the top of the first push rod, a second limiting block 3121 is arranged in the sixth movable groove, a push block 3122 is arranged at the top of the second limiting block, a seventh movable groove matched with the push block is formed in the top of the sixth movable groove, a limiting spring 3123 is arranged on the side wall of the second limiting block, and a first connecting frame matched with the second limiting block is arranged at the top of the first mounting block; when pushing down first push rod, promote the ejector pad along seventh movable groove, push the sixth movable groove with the second stopper, first push rod bottom motion is to fourth activity chamber bottom back, the second stopper removes to first connecting frame one side, spacing spring promotes the second stopper and removes toward first connecting frame, the second stopper imbeds and plays limiting displacement to first push rod in the first connecting frame, thereby guarantee the cooperation effect of first stopper and spacing groove, fix first installation piece on the assigned position.

A fifth movable cavity is arranged on the second mounting block, a plurality of first through grooves are formed in the side wall of the fifth movable cavity, a second connecting plate 321 is arranged in the fifth movable cavity, a plurality of second lugs matched with the first through grooves are arranged on the second connecting plate, a plurality of second grooves matched with the second lugs are formed in the inner wall of the second through cavity, and a fixing spring 322 is arranged on the side part of the second connecting plate; a second sliding groove is formed in the inner wall of the second through cavity, a second sliding block matched with the second sliding groove is arranged on the second mounting block, and under the mutual matching of the second sliding groove and the second sliding block, the second mounting block is fixed in the second through cavity to prevent the second mounting block from falling out of the second through cavity; when the position of the second mounting block is adjusted, the second connecting plate is pushed into the fifth movable cavity, the second bump enters the fifth movable cavity, the second mounting block is pushed to move along the inner wall of the second through cavity, after the second mounting block moves to the specified position, the second connecting plate is released, and the second bump is embedded into the second groove to fix the drilling cutter on the specified position and adjust the position of the drilling cutter.

A sixth movable cavity is arranged on the second mounting block and is communicated with the connecting ring, a second push rod 323 is arranged in the sixth movable cavity, a second connecting spring 325 is arranged at the top of the second push rod, and the top end of the second connecting spring is fixedly connected to the top of the sixth movable cavity; a second through groove is formed in the bottom of the positioning groove, a material receiving box 11 matched with the second through groove is arranged at the bottom of the processing table, a second connecting frame matched with the material receiving box is arranged at the bottom of the processing table, the material receiving box is made of a magnet, and a second push rod is made of iron alloy; when being processing treatment to steel, the pneumatic cylinder promotes the mounting panel and moves down, and the drilling sword moves down and contacts with steel, beats out the through-hole on steel, and the drilling sword pierces through the distance that steel shortened and material receiving box, attracts the second push rod to move down under the magnetic force effect, and the second push rod is stretched out in the link down in the motion follow link, will inlay the steel release in the drilling sword under the second push rod effect, avoids the steel card to influence the normal use of drilling sword in the drilling sword.

A second movable groove and a third movable groove are arranged at the bottom of the positioning groove and are respectively arranged at two ends of the positioning groove, a first supporting rod 12 is arranged in the second movable groove, a first supporting spring 121 is arranged at the bottom of the first supporting rod 12, a second supporting rod 13 is arranged in the third movable groove, and a second supporting spring 131 is arranged at the bottom of the second supporting rod 13; a fourth movable groove is formed in one side of the second movable groove, a first through hole is formed in the top of the fourth movable groove, a first movable cavity is formed in the first supporting rod 12, a third supporting rod 122 is arranged in the first movable cavity, a first supporting plate 123 is arranged on the third supporting rod 122, and when the mounting plate 2 moves upwards, the first supporting plate 123 moves upwards; when adding man-hour to steel, place steel in the constant head tank, steel pushes down first bracing piece 12 and second bracing piece 13, steel is embedded into the constant head tank, pneumatic cylinder 22 drive mounting panel 2 down moves, drilling sword 33 supports the drilling operation of accomplishing steel on steel, gravity is less than supporting spring elasticity behind the steel drilling, supporting spring promotes steel up-movement, release steel from the constant head tank, mounting panel 2 up-movement drives third bracing piece 122 up-movement, first bracing piece 123 promotes steel one end and rises, steel forms the inclined plane after and from the landing of processing platform, accomplish receiving of steel.

A first opening matched with the fourth movable groove is formed in the side wall of the first movable cavity, a third connecting plate 124 is arranged on the third supporting rod, a fourth connecting rod 125 matched with the first through hole is arranged on the third connecting plate, a rubber ring is arranged on the fourth connecting rod, and a connecting groove matched with the fourth connecting rod is formed in the bottom of the mounting plate; when the mounting plate moves downwards, the mounting plate is in contact with the fourth connecting rod, the fourth connecting rod is inserted into the connecting groove, and the connecting effect of the fourth connecting rod and the connecting groove is increased under the arrangement of the rubber ring; when the mounting panel up-moved, driven the fourth connecting rod up-moving under the rubber ring effect, the fourth connecting rod drives the third bracing piece up-moving to make steel form the inclined plane, take off steel from the processing platform.

A second supporting plate 132 is arranged at the top of the second supporting rod, a baffle 14 is rotatably connected to one side of the positioning groove, a connecting shaft is arranged on the baffle, and the baffle is connected into the positioning groove through the connecting shaft; the top of the baffle is provided with a chute, the inner walls of the two sides of the positioning groove are respectively provided with a seventh movable cavity, the connecting shaft penetrates through the seventh movable cavity, the connecting shaft is provided with a fourth connecting plate 141, the side wall of the second supporting rod is provided with a fifth connecting plate 133, the fifth connecting plate penetrates through the seventh movable cavity, the top of the fifth connecting plate is provided with a sixth connecting plate 134, and the sixth connecting plate is arranged at the top of the fourth connecting plate; a third supporting plate 15 is arranged on one side of the baffle plate, and a third supporting spring 151 is arranged on the third supporting plate; when steel is placed in the positioning groove, the steel presses the first supporting rod and the second supporting rod downwards, the sixth connecting plate presses the fourth connecting plate, the baffle is in a vertical state, and the positioning groove is sealed, so that the steel can be positioned; after punching of steel is completed, the first supporting rod and the second supporting rod push the steel to move upwards, the second supporting rod drives the sixth connecting plate to move upwards, the sixth connecting plate is separated from the top of the fourth connecting plate, the baffle is turned over outside the outer positioning groove under the action of gravity, the baffle is in an inclined state, the third supporting rod moves upwards to enable the steel plate to form an inclined plane, the steel plate starts to slide downwards under the action of the gravity of the steel plate, the height of the baffle is reduced after the baffle is inclined, the steel normally slides down from a processing table, and the inclined groove plays a role in guiding, so that the steel plate is prevented from being subjected to resistance when contacting with the baffle; after the processed steel falls off from the processing table, new steel is placed in the positioning groove, the second supporting rod is pushed to move downwards under the action of the gravity of the steel plate, the sixth connecting plate presses the fourth connecting plate downwards, the baffle rotates around the connecting point to be in a vertical state, and the steel plate in the positioning groove is positioned again; the third supporting spring provides supporting force for the baffle plate, so that the baffle plate is still in an inclined state after being turned down, the baffle plate is prevented from being turned down completely, and the baffle plate is enabled to reset automatically under the action of the sixth connecting plate.

A positioning frame 231 is arranged on the first connecting plate 23, a second movable block 24 is arranged in the positioning frame 231, a convex strip is arranged on the first connecting plate 23, and a first groove matched with the convex strip is arranged on the second movable block 24; a second movable cavity is arranged on the second movable block 24, an equipment cavity is arranged on one side of the second movable cavity, an electric first push rod 27 is arranged in the equipment cavity, a movable plate 26 is arranged on a piston rod of the electric first push rod 27, a first connecting rod 261 and a second connecting rod 266 are respectively arranged on the side walls of two sides of the movable plate 26, a third movable cavity matched with the first connecting rod 261 is arranged on the inner wall of the second movable cavity, and a connecting hole matched with the second connecting rod 266 is arranged on the first movable block 3; after the design method is formed, the position of the second mounting block 32 is adjusted, the hydraulic cylinder 22 drives the mounting plate 2 to move downwards, the drilling knife 33 punches a through hole in the steel, the electric first push rod 27 pushes the movable plate 26 to move forwards, the second connecting rod 266 pushes the first movable block 3 to move forwards, the first movable block 3 is pushed to the other side of the first movable groove, the hydraulic cylinder 22 drives the mounting plate 2 to move downwards again, the drilling knife 33 contacts with the steel again, a through hole is punched in the other position of the steel, the driving motor 25 drives the second movable block 24 to move, the first movable block 3 moves along with the second movable block 24, the hydraulic cylinder 22 drives the mounting plate 2 to move downwards after the first movable block 3 moves, and the drilling treatment is completed on the whole steel.

A first cavity is formed in the second connecting rod, a plurality of second openings are formed in the side wall of the first cavity, a sealing film 267 is arranged in each second opening, the sealing film is made of rubber, a second cavity communicated with the first cavity is formed in the movable plate, a third cavity communicated with the second cavity is formed in the first connecting rod, a stop block 262 is arranged in each third cavity, a fifth connecting rod 263 is arranged on each stop block, the fifth connecting rod is connected with the inner wall of the third movable cavity through a connecting rope, and the connecting rope is a steel wire rope; an eighth movable cavity is arranged on the stop block, a third connecting spring 265 is arranged in the eighth movable cavity, and a third movable block 264 is arranged at one end of the third connecting spring; when the second connecting rod is inserted into the connecting hole, the sealing film is contacted with the inner wall of the connecting hole, the connecting effect of the second connecting rod and the connecting hole is increased under the action of the sealing film, and the use reliability of the equipment is ensured; when the first movable block needs to move from one end of the first movable groove to the other end of the first movable groove, the electric push rod pushes the movable plate to move forwards, the first connecting rod moves towards the outer side of the third movable cavity, the fifth connecting rod is pulled to move under the action of the connecting rope, the fifth connecting rod drives the stop block to move towards the third cavity, after the space of the second cavity is increased, airflow in the first cavity enters the second cavity, the sealing membrane is separated from the inner wall of the connecting hole, and therefore the first movable block is pushed to the other end of the first movable groove; when the first movable block is sent into another second connecting rod, the second connecting rod is inserted into the connecting hole, the sealing film is extruded under the inner wall of the connecting hole, the air pressure in the first cavity enters the second cavity to push the third movable block to move, and the third movable block enters the eighth movable cavity to slightly deform the sealing film so as to normally insert the second connecting rod into the connecting hole and complete the connection of the second connecting rod and the first movable block.

The driving motor is arranged at the top of the positioning frame, a driving wheel 251 is arranged on an output shaft of the driving motor, the driving wheel is an incomplete gear, only a half of circular arc of the driving wheel is contacted with the second movable block, a driving plate 241 matched with the driving wheel is arranged on the second movable block, and a second reset spring is further arranged on the second movable block; when a first movable block needs to move from one side of a first movable groove to the other side of the first movable groove, a driving motor drives a driving wheel to rotate, the driving wheel is in contact with a driving plate to drive a second movable block to move, the first movable block is pushed to the other side of the first movable groove, after the first movable block is separated from a second connecting rod on one side, the driving motor drives the driving wheel to continue rotating, the driving wheel is separated from the driving plate to be in contact with the driving plate, the second movable block is pushed to reset under the action of a second reset spring, so that the first movable block moves between the second movable blocks on two sides, and the alternation of the first movable blocks is completed.

In order to make the operation of the first movable block more convenient, a support frame 21 is arranged at the top of the mounting plate, and a piston rod of the hydraulic cylinder is fixedly connected to the top of the support frame.

As shown in fig. 4, taking the initial position of the first movable block at the front side of the first movable groove as an example, after the design method is formed, pushing the second connecting plate, moving the second mounting block, adjusting the position of the drilling knife, after the position of the drilling knife is determined, placing the steel material into the positioning groove, embedding the steel material into the positioning groove, fixing the steel material, driving the mounting plate to move downwards by the hydraulic cylinder, and drilling a through hole on the steel material by the drilling knife; the mounting plate moves upwards, the steel plate is still embedded in the positioning groove because the weight of the steel plate is still greater than the gravity of the supporting spring, and the steel plate cannot be separated from the positioning groove after the first supporting plate pushes the steel plate to form an inclined plane; an electric push rod on the left second movable block pushes the movable plate to be driven forwards, the second connecting rod drives the first movable block to move forwards, the first connecting block is pushed to the second connecting rod on the right second movable block, the electric push rod on the left second movable block drives the movable plate to move backwards, a driving motor on the left side drives a driving wheel to rotate, the left second movable block is moved to the rear side of the first movable groove, the hydraulic cylinder drives the mounting plate to descend again, and the drilling knife punches a through hole on the steel again; then the mounting plate moves upwards, the right driving motor drives the second movable block to move, the second movable block on the right drives the first movable block to move to the rear side of the first movable groove, the hydraulic cylinder drives the mounting plate to descend, and a through hole is punched in the steel; the mounting plate rises again, the electric push rod on the second right movable block pushes the movable plate to move forwards, the first movable block on the second right movable block is pushed to the second left movable block, and the hydraulic cylinder drives the mounting plate to descend to complete the punching operation of the whole steel; at this moment, the weight of the steel is smaller than the elastic force of the supporting spring, the second supporting plate and the first supporting plate push the steel to move upwards, the mounting plate moves upwards to drive the first supporting plate to move upwards, the first supporting plate enables the steel to be in an inclined state, the baffle plate overturns outwards, the steel automatically slides from the processing table under the action of the gravity of the steel, and therefore the steel after being formed is collected.

The driving motor, the electric push rod and the hydraulic cylinder in the attached drawings of the application specification are all schematic diagrams, and the specific structures of the driving motor, the electric push rod and the hydraulic cylinder are the same as those of the motor, the electric push rod and the hydraulic cylinder in the prior art.

Claims

1. A design method of a low flow resistance prerotation phase silencer comprises an outer cylinder (50) and a porous plate arranged in the outer cylinder, wherein the porous plate surrounds a plurality of inner flow channels in the outer cylinder (50), and a silencing material is filled between the inner flow channels and the outer cylinder (50); the inlet and the outlet of the internal flow passage are staggered; the thickness of the silencing material is 50-100 mm; the method is characterized in that: the design method of the low-flow-resistance pre-rotation phase silencer comprises the following steps:

wherein n is the rotation speed in rpm; z is the number of leaves; i is the frequency order; f is the unit of frequency Hz;

La＝10lg(QP²)-19.8+LSA

step3, designing the inlet flow area of the low-flow-resistance pre-rotation phase muffler, controlling the average speed of the inlet section within a reasonable range according to the flow, and inhibiting the generation of regenerative noise; designing the shape of an inlet through flow port and the thickness of silencing cotton between flow channels, and selecting the thickness of the silencing cotton to be 50-100 mm;

delta L is the calculated noise elimination quantity, and the unit is dB; phi is a_αThe coefficient of sound attenuation of the material is selected from phi_αDesigned to be 1-1.5; beta is a_pThe circumferential tortuosity coefficient of the through-flow section; beta is a_LSelecting beta as the length of the through-flow and the tortuosity factor_LDesigned to be 1.7-3; the perimeter of the P through-flow section is m; l muffler length in m; s is the flow cross-sectional area in m²；

step6, meeting the requirements and outputting a design method;

and Step9, welding the porous plate on the inner wall of the outer cylinder according to the calculation structure to complete the assembly of the silencer.

2. The design method of the low flow resistance prerotation phase muffler according to claim 1, characterized in that: the punching machine comprises a processing table (1) and a mounting plate (2) arranged above the processing table (1), a hydraulic cylinder (22) is arranged at the top of the mounting plate (2), a positioning groove is formed in the processing table (1), a first movable groove matched with the positioning groove is formed in the mounting plate (2), a first movable block (3) is arranged in the first movable groove, first connecting plates (23) are respectively arranged on two sides of the mounting plate (2), and a driving motor (25) used for driving the first movable block (3) to move is arranged on each first connecting plate (23); the first movable block (3) is provided with a plurality of first through cavities, a first mounting block (31) capable of moving up and down is arranged in each first through cavity, a second through cavity is arranged on each first mounting block (31), a second mounting block (32) is arranged in each second through cavity, each second mounting block (32) can move along the inner wall of each second through cavity, a drilling cutter (33) is arranged at the bottom of each second mounting block (32), and a connecting ring matched with the drilling cutter (33) is arranged at the bottom of each second mounting block (32); after the design method is formed, steel is placed in the positioning groove, the position of the second mounting block (32) is adjusted according to the design method, the hydraulic cylinder (22) drives the mounting plate (2) to move downwards, the mounting plate (2) drives the drilling knife (33) to move downwards, the drilling knife (33) is in contact with the steel in the positioning groove, and a through hole is drilled in the steel; then the driving motor (25) drives the first movable block (3) to move in the first movable groove, the hydraulic cylinder (22) drives the mounting plate (2) to move downwards after the first movable block (3) moves to one position, a through hole is punched in the whole piece of steel, and the steel is machined.

3. The design method of the low flow resistance prerotation phase muffler according to claim 2, characterized in that: a second movable groove and a third movable groove are arranged at the bottom of the positioning groove, the second movable groove and the third movable groove are respectively arranged at two ends of the positioning groove, a first supporting rod (12) is arranged in the second movable groove, a first supporting spring (121) is arranged at the bottom of the first supporting rod (12), a second supporting rod (13) is arranged in the third movable groove, and a second supporting spring (131) is arranged at the bottom of the second supporting rod (13); a fourth movable groove is formed in one side of the second movable groove, a first through hole is formed in the top of the fourth movable groove, a first movable cavity is formed in the first supporting rod (12), a third supporting rod (122) is arranged in the first movable cavity, a first supporting plate (123) is arranged on the third supporting rod (122), and when the mounting plate (2) moves upwards, the first supporting plate (123) moves upwards; when adding man-hour to steel, place steel in the constant head tank, steel pushes down first bracing piece (12) and second bracing piece (13), steel is embedded into the constant head tank, pneumatic cylinder (22) drive mounting panel (2) down the motion, drilling sword (33) support the drilling operation of accomplishing steel on steel, gravity is less than supporting spring elasticity behind the steel drilling, supporting spring promotes steel up-movement, release steel from the constant head tank, mounting panel (2) up-movement drive third bracing piece (122) up-movement, first bracing piece (123) promote steel one end and rise, steel forms the processing bench landing after the inclined plane, accomplish receiving of steel.

4. The design method of the low flow resistance prerotation phase muffler according to claim 2, characterized in that: a positioning frame (231) is arranged on the first connecting plate (23), a second movable block (24) is arranged in the positioning frame (231), a convex strip is arranged on the first connecting plate (23), and a first groove matched with the convex strip is arranged on the second movable block (24); a second movable cavity is arranged on the second movable block (24), an equipment cavity is arranged on one side of the second movable cavity, an electric first push rod (27) is arranged in the equipment cavity, a movable plate (26) is arranged on a piston rod of the electric first push rod (27), a first connecting rod (261) and a second connecting rod (266) are respectively arranged on the side walls of two sides of the movable plate (26), a third movable cavity matched with the first connecting rod (261) is arranged on the inner wall of the second movable cavity, and a connecting hole matched with the second connecting rod (266) is formed in the first movable block (3); after the design method is formed, the position of a second mounting block (32) is adjusted, a hydraulic cylinder (22) drives a mounting plate (2) to move downwards, a drilling knife (33) drills a through hole on steel, an electric first push rod (27) pushes a movable plate (26) to move forwards, a second connecting rod (266) pushes a first movable block (3) to move forwards, the first movable block (3) is pushed to the other side of a first movable groove, the hydraulic cylinder (22) drives the mounting plate (2) to move downwards again, the drilling knife (33) is contacted with the steel again, a through hole is punched in the other position of the steel, a driving motor (25) drives a second movable block (24) to move, the first movable block (3) moves along with the second movable block (24), and the hydraulic cylinder (22) drives the mounting plate (2) to move downwards after the first movable block (3) moves, so that the whole steel is drilled.