CN110095226B - Gas impact jet flow pressure measuring device based on intermittent type spiral motion mechanism - Google Patents
Gas impact jet flow pressure measuring device based on intermittent type spiral motion mechanism Download PDFInfo
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- CN110095226B CN110095226B CN201910462299.5A CN201910462299A CN110095226B CN 110095226 B CN110095226 B CN 110095226B CN 201910462299 A CN201910462299 A CN 201910462299A CN 110095226 B CN110095226 B CN 110095226B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/26—Details or accessories
Abstract
The invention relates to a gas impact jet flow pressure measuring device based on an intermittent spiral motion mechanism. Including casing and the bearing plate of setting at the casing top, casing and bearing plate between form a hollow airtight cavity, the bearing plate begin to be equipped with spiral gas pocket of arranging to the outside from the central point, airtight cavity in be equipped with motor, intermittent type adjusting device, rotary adjusting device, straight line adjusting device and gas pressure sensor, be fixed with drive gear on the output shaft of motor. According to the technical scheme, the intermittent movement of the gas pressure sensor along the spiral line on the threaded rod is realized through the intermittent adjusting device, the rotary adjusting device and the linear adjusting device, and the pressure distribution of different distances between the nozzle and the pressure bearing plate and different distances between the measuring point and the center of the jet flow can be quickly measured through the gas pressure sensor under the condition that the pressure bearing plate is fixed and does not move only by one motor.
Description
Technical Field
The invention relates to the field of flow parameter measurement of gas impact jet, in particular to a gas impact jet pressure measuring device based on an intermittent spiral motion mechanism.
Background
Gas impingement jets are widely used in many technical fields, such as ventilators, chemical plants and jet planes. The actual situation cannot be completely simulated by software, so experiments need to be performed on the designed pneumatic nozzle to verify its performance. The measurement schemes mainly adopted at present are as follows: 1. a plurality of sensors are used to measure the pressure of the impact surface of the jet. The scheme requires that the sensors have higher response frequency and more flexible arrangement mode, the requirement on accuracy is very strict, the measurement cost is higher, and the price of a single sensor is more than 3000 yuan taking domestic Shanghai Tian bath NS-1 model as an example. 2. Pressure sensitive coating manometry techniques are used. Although the technology can directly measure the distribution of the surface pressure, the equipment is expensive and complex in measuring process, a CCD camera, pressure-sensitive paint, a fluorescent lamp and the like are needed, the equipment price is in the range of tens of thousands to hundreds of thousands, and meanwhile, the high pressure easily causes temperature change, thereby affecting the measuring result. 3. A thin film sensor is used. The film sensor can directly measure the surface pressure distribution, but the price is high, and the measuring range and the precision are limited. In addition, in actual operation, the gas jet impact conditions are numerous, and the traditional measurement scheme is difficult to realize efficient and universal measurement.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art and provides a gas impact jet flow pressure measuring device based on an intermittent spiral motion mechanism.
In order to achieve the purpose, the invention adopts the following technical scheme: the air pressure sensor comprises a shell and a bearing plate arranged at the top of the shell, wherein a hollow closed cavity is formed between the shell and the bearing plate, air holes which are spirally arranged are formed in the bearing plate from the central point to the outer side, a motor, an intermittent adjusting device, a rotary adjusting device, a linear adjusting device and an air pressure sensor are arranged in the closed cavity, and a driving gear is fixed on an output shaft of the motor;
the intermittent adjusting device comprises a first spoke type gear serving as an input gear and a second spoke type gear serving as an output gear, the first spoke type gear is meshed with the driving gear, and an incomplete gear mechanism enabling the second spoke type gear to realize intermittent motion is arranged between the first spoke type gear and the second spoke type gear;
the rotation adjusting device comprises a main shaft gear serving as an input gear and a main bevel gear serving as an output gear, the main shaft gear is meshed with the second spoke type gear, and a speed change mechanism for changing the rotating speed of the main bevel gear is arranged between the main shaft gear and the main bevel gear;
the linear adjusting device comprises a side bevel gear serving as an input gear and a second side upper gear serving as an output gear, the side bevel gear is meshed with the main bevel gear, the second side upper gear is connected with a threaded rod, and a sensor sleeve used for mounting a gas pressure sensor is arranged in a spiral groove of the threaded rod; the linear adjusting device also comprises a circular baffle which is attached to and sealed with the lower plate surface of the bearing plate, the central axis of the circular baffle, the central axis of the bearing plate and the central axis of the main shaft gear are matched, the area of the circular baffle can cover all air holes in the bearing plate, a notch for accommodating the transverse rail is formed in the circular baffle, the upper surface of the transverse rail is flush with the upper plate surface of the circular baffle, a sensor inner sleeve for the gas pressure sensor to pass through is arranged in the transverse rail, the circular baffle is connected with the rotary adjusting device to realize rotation, and the transverse rail moves linearly along the direction limited by the notch.
The intermittent adjusting device comprises a first gear shaft, a second gear shaft and a third gear shaft which are arranged in the vertical direction, wherein the first gear shaft is coaxially provided with a first spoke type gear and a first incomplete gear from top to bottom, the second gear shaft is coaxially provided with a second incomplete gear and a stepped shaft gear from bottom to top, and the third gear shaft is provided with a second spoke type gear, wherein: the first spoke type gear is meshed with the driving gear, the first incomplete gear is matched with the second incomplete gear to form an incomplete gear mechanism, the stepped shaft gear is meshed with the second spoke type gear, the second spoke type gear is meshed with the main shaft gear, and when the gear teeth of the first incomplete gear are meshed with the gear teeth on the second incomplete gear, the second gear shaft rotates; when the locking circular arc on the first incomplete gear is tangent to the locking circular arc on the second incomplete gear, the second gear shaft stops rotating.
The bottom parts of the first gear shaft, the second gear shaft and the third gear shaft are respectively fixed with a first base arranged on the bottom plate of the shell through first bearings, the first base is an L-shaped bending plate, the first gear shaft, the third gear shaft and the second gear shaft are respectively arranged at two ends and at a bending position of the first base, the first gear shaft and the second gear shaft are respectively stepped shafts, and the first incomplete gear and the second incomplete gear are respectively arranged at shaft shoulders of the stepped shafts.
The rotation adjusting device comprises a main shaft and a side shaft which are arranged in the vertical direction, the main shaft is positioned at the center of a bottom plate of the shell, a main bevel gear, a sleeve gear and a main shaft gear are coaxially arranged on the main shaft from top to bottom, the main bevel gear and the sleeve gear are respectively fixed on a main shaft sleeve, the main shaft sleeve is connected with the main shaft through a bearing, a first side lower gear and a first side upper gear are coaxially arranged on the side shaft from bottom to top, the number of teeth of the main shaft gear and the first side upper gear is equal, the number of teeth of the sleeve gear and the first side lower gear is equal, the first side lower gear, the first side upper gear, the sleeve gear and the main shaft gear are matched to form a speed change mechanism, wherein: the main shaft gear is respectively meshed with the second spoke type gear and the first side lower gear, the first side upper gear is meshed with the sleeve gear, and the main bevel gear is meshed with the side bevel gear.
The bottom of main shaft and side shaft is fixed mutually through second bearing and third bearing and second base and the third base that sets up on the casing bottom plate respectively, the top of main shaft is equipped with the connecting axle that is used for connecting sharp adjusting device, the top of connecting axle is equipped with the sensor guide rail that the horizontal direction was arranged, the connecting axle on be equipped with respectively with threaded rod and main side pole matched with screw rod hole and main side pole hole, main shaft, connecting axle and sensor guide rail integrated into one piece.
The straight line adjusting device comprises a threaded rod and a main side rod which are horizontally arranged in the vertical direction, one end of the threaded rod is connected with an optical axis, the threaded rod and the optical axis are of an integral structure, the optical axis vertically penetrates through the connecting shaft, and a second side upper gear is arranged at the end part of the optical axis; the perpendicular both ends that run through connecting axle and main side pole of main side pole be equipped with second side lower gear and side bevel gear respectively, wherein: the second side upper gear is meshed with the second side lower gear, and the side bevel gear is meshed with the main bevel gear.
The gas pressure sensor is connected with the sensor guide rail through the sensor sleeve, the sensor sleeve comprises a sleeve body, a sleeve step and a sleeve tail rod, the sleeve body, the sleeve step and the sleeve tail rod are sequentially connected into a whole from top to bottom, the sleeve body is used for placing the gas pressure sensor, the sleeve step is used for limiting the movement direction of the sensor sleeve, the sleeve tail rod penetrates through the sensor guide rail, and the end part of the sleeve tail rod is located in a spiral groove of the threaded rod.
The cross section of the sensor guide rail is U-shaped and comprises a bottom plate and two first side plates, a guide rail groove for the sleeve tail rod to penetrate through is formed in the bottom plate, and T-shaped grooves matched with the sleeve steps are formed in the inner plate surfaces of the two first side plates in an upward mode from the bottom respectively.
The circular baffle is provided with a square notch from the edge to the center, a transverse rail is arranged in the notch, the upper surface of the transverse rail is flush with the upper surface of the circular baffle, the lower surface of the transverse rail is abutted against the upper surface of the sensor guide rail, a sensor inner sleeve matched with the gas pressure sensor is arranged in the transverse rail, a through hole is formed in the position, matched with the sensor inner sleeve, of the upper surface of the transverse rail, so that the upper surface of the gas pressure sensor is flush with the upper surface of the transverse rail, the circular baffle is driven to rotate by a connecting shaft integrated with the main shaft, and the transverse rail is driven by the gas pressure sensor to linearly move along the direction limited by the notch.
The cross rail be the cell body of the type of falling U for the cross-section, including roof and two second curb plates, the last face of roof is the step face of a height, wherein: the high step surface is flush with the upper plate surface of the circular baffle plate, and the low step surface is attached to the lower plate surface of the circular baffle plate;
the lower plate surface of the circular baffle plate is provided with a first baffle plate and a second baffle plate which are arranged in the vertical direction, the first baffle plate and the second baffle plate are symmetrically arranged on two sides of the notch, the inner plate surfaces of the first baffle plate and the second baffle plate are respectively attached to the outer plate surfaces of the two second side plates, the inner plate surfaces of the first baffle plate and the second baffle plate upwards form a square step surface from the bottom, and the step surface is attached to and fixed with the top surface and the side surface of the sensor guide rail.
According to the technical scheme, the intermittent movement of the gas pressure sensor along the spiral line on the threaded rod is realized through the intermittent adjusting device, the rotary adjusting device and the linear adjusting device, and the pressure distribution of different distances between the nozzle and the pressure bearing plate and different distances between the measuring point and the center of the jet flow can be quickly measured through the gas pressure sensor under the condition that the pressure bearing plate is fixed and does not move only by one motor.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the internal structure of the present invention with the housing and the bearing plate removed;
FIG. 3 is a schematic view of the construction of the intermittent adjustment mechanism of the present invention;
FIG. 4 is a schematic view of the construction of the rotary adjustment device of the present invention;
FIG. 5 is a schematic view of the construction of the connecting shaft and the linear adjustment mechanism of the present invention;
FIG. 6 is an exploded view of FIG. 5;
FIG. 7 is a schematic view of the connection of the sensor rail to the sensor cartridge of the present invention;
FIG. 8 is a diagram of the initial state of motion of the gas pressure sensor of the present invention;
FIG. 9 is a cut-off state diagram of the movement of the gas pressure sensor of the present invention;
FIG. 10 is a schematic structural view of the cross rail of the present invention;
fig. 11 is a state diagram of the use of the present invention.
The labels in the figures are:
1-shell, 11-first base, 12-second base, 13-third base, 2-bearing plate, 21-air hole, 3-motor, 31-driving gear, 4-intermittent adjusting device, 41-first spoke gear, 42-second spoke gear, 43-first incomplete gear, 44-second incomplete gear, 45-stepped shaft gear, 46-first gear shaft, 47-second gear shaft, 48-third gear shaft, 5-rotary adjusting device, 51-main shaft gear, 52-main cone gear, 53-set gear, 54-first side lower gear, 55-first side upper gear, 56-main shaft, 561-main shaft sleeve, 57-side shaft, 58-connecting shaft, 581-threaded rod hole, 582-main side rod hole, 59-sensor guide rail, 591-bottom plate, 592-first side plate, 593-guide rail groove, 594-T type groove, 6-linear adjusting device, 61-side bevel gear, 62-second side upper gear, 63-threaded rod, 631-optical axis, 64-circular baffle, 641-notch, 65-cross rail, 651-sensor inner sleeve, 652-through hole, 653-top plate, 654-second side plate, 66-main side rod, 67-second side lower gear, 68-first baffle, 69-second baffle, 7-gas pressure sensor, 8-sensor sleeve, 81-sleeve body, 82-sleeve step, 83-sleeve tail rod and 9-nozzle.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 and 2, the gas impact jet pressure measuring device based on the intermittent screw motion mechanism comprises a shell 1 and a bearing plate 2 arranged at the top of the shell 1, a hollow closed cavity is formed between the shell 1 and the bearing plate 2, the bearing plate 2 is provided with air holes 21 spirally arranged from a central point to the outside, a motor 3, an intermittent adjusting device 4, a rotary adjusting device 5, a linear adjusting device 6 and a gas pressure sensor 7 are arranged in the closed cavity, a driving gear 31 is fixed on an output shaft of the motor 3, and the motor 3 is connected with the output shaft of the motor 3 through a speed reducer and a coupling. The arrangement of the air holes 21 in the invention is characterized in that points are taken based on an Archimedes spiral line, the point taking rule is that the angle difference theta of two adjacent points is a fixed value, and the radial displacement r is a fixed value, so that a rectangular coordinate system which takes the pressure as a vertical coordinate and theta and r as a horizontal coordinate can be established for point-by-point measurement. The air holes 21 are spirally arranged, so that the characteristics of dense middle and loose excircle are achieved, the characteristics of high central area, fast change, low pressure of excircle area and small change of corresponding gas impact jet pressure are achieved, the data acquisition amount can be reduced, the space difference value is convenient, and the measurement efficiency is improved.
Further, as shown in fig. 3, the intermittent adjustment device 4 includes a first spoke gear 41 as an input gear and a second spoke gear 42 as an output gear, the first spoke gear 41 is engaged with the drive gear 31, and an incomplete gear mechanism for allowing the second spoke gear 42 to perform intermittent motion is provided between the first spoke gear 41 and the second spoke gear 42;
specifically, the intermittent adjustment device 4 includes a first gear shaft 46, a second gear shaft 47, and a third gear shaft 48 that are arranged in the vertical direction, the first gear shaft 46 is provided with a first spoke gear 41 and a first incomplete gear 43 coaxially from top to bottom, the second gear shaft 47 is provided with a second incomplete gear 44 and a stepped shaft gear 45 coaxially from bottom to top, and the third gear shaft 48 is provided with a second spoke gear 42, in which: the first spoke type gear 41 is meshed with the driving gear 31, the first incomplete gear 43 is matched with the second incomplete gear 44 to form an incomplete gear mechanism, the stepped shaft gear 45 is meshed with the second spoke type gear 42, the second spoke type gear 42 is meshed with the main shaft gear 51, and when the gear teeth of the first incomplete gear 43 are meshed with the gear teeth on the second incomplete gear 44, the second gear shaft 47 performs rotary motion; when the locking arc on the first incomplete gear 43 is tangent to the locking arc on the second incomplete gear 44, the second gear shaft 47 stops rotating.
The gear transmission sequence in the intermittent adjustment device 4 is as follows: the drive gear 31 → the first spoke gear 41 → the first partial gear 43 → the second partial gear 44 → the stepped shaft gear 45 → the second spoke gear 42.
More specifically, the bottoms of the first gear shaft 46, the second gear shaft 47, and the third gear shaft 48 are respectively fixed to the first base 11 disposed on the bottom plate of the housing 1 through first bearings, the first base 11 is an L-shaped bent plate, the first gear shaft 46, the third gear shaft 48, and the second gear shaft 47 are respectively disposed at two ends and at a bent portion of the first base 11, the first gear shaft 46 and the second gear shaft 47 are respectively stepped shafts, and the first incomplete gear 43 and the second incomplete gear 44 are respectively disposed at shaft shoulders of the stepped shafts.
Further, as shown in fig. 4, the rotation adjusting device 5 includes a main shaft gear 51 as an input gear and a main bevel gear 52 as an output gear, the main shaft gear 51 is engaged with the second spoke gear 42, and a speed changing mechanism for changing the rotation speed of the main bevel gear 52 is provided between the main shaft gear 51 and the main bevel gear 52;
specifically, the rotation adjusting device 5 includes a main shaft 56 and a side shaft 57 arranged in the vertical direction, the main shaft 56 is located at the center of the bottom plate of the housing 1, the main shaft 56 is coaxially provided with a main bevel gear 52, a sleeve gear 53 and a main shaft gear 51 from top to bottom, the main bevel gear 52 and the sleeve gear 53 are respectively fixed on a main shaft sleeve 561, the main shaft sleeve 561 is connected with the main shaft 56 through a bearing, the side shaft 57 is coaxially provided with a first side lower gear 54 and a first side upper gear 55 from bottom to top, the number of teeth of the main shaft gear 51 and the first side upper gear 55 is equal, the number of teeth of the sleeve gear 53 and the first side lower gear 54 are equal, the first side lower gear 54, the first side upper gear 55, the sleeve gear 53 and the main shaft gear 51 are matched to form a speed change mechanism, and the function is to make the rotational speeds of the sleeve gear 53 and the main shaft gear 51; wherein: the spindle gear 51 meshes with the second spoke gear 42 and the first side lower gear 54, the first side upper gear 55 meshes with the sleeve gear 53, and the main bevel gear 52 meshes with the side bevel gear 61, respectively.
The gear transmission sequence in the rotation adjusting device 5 is as follows: second spoke gear 42 → main shaft gear 51 → first side lower gear 54 → first side upper gear 55 → sleeve gear 53 → main bevel gear 52.
More specifically, the bottom of the main shaft 56 and the bottom of the side shaft 57 are fixed to the second base 12 and the third base 13 disposed on the bottom plate of the housing 1 through a second bearing and a third bearing, respectively, a connecting shaft 58 for connecting the linear adjustment device 6 is disposed on the top of the main shaft 56, a sensor guide 59 disposed in the horizontal direction is disposed on the top of the connecting shaft 58, a threaded rod hole 581 and a main side rod hole 582 for engaging with the threaded rod 63 and the main side rod 66 are disposed on the connecting shaft 58, and the main shaft 56, the connecting shaft 58 and the sensor guide 59 are integrally formed.
Further, as shown in fig. 4, 5 and 6, the linear adjustment device 6 includes a side bevel gear 61 as an input gear and a second side upper gear 62 as an output gear, the side bevel gear 61 is engaged with the main bevel gear 52, the second side upper gear 62 is connected with a threaded rod 63, and a sensor sleeve 8 for mounting the gas pressure sensor 7 is arranged in a spiral groove of the threaded rod 63;
specifically, the linear adjusting device 6 includes a threaded rod 63 and a main side rod 66 horizontally arranged in the vertical direction, one end of the threaded rod 63 is connected with an optical axis 631, the threaded rod 63 and the optical axis 631 are integrated, the optical axis 631 vertically penetrates through the connecting shaft 58, and the end of the optical axis 631 is provided with a second side upper gear 62; the main side lever 66 vertically penetrates the connecting shaft 58 and both ends of the main side lever 66 are respectively provided with a second side lower gear 67 and a side bevel gear 61, the optical axis 631 is connected with the threaded lever hole 581 through a bearing, the main side lever 66 is connected with the main side lever hole 582 through a bearing, wherein: the second side upper gear 62 is meshed with the second side lower gear 67, and the side bevel gear 61 is meshed with the main bevel gear 52.
The gear transmission sequence in the linear adjustment device 6 is as follows: the main bevel gear 52 → the side bevel gear 61 → the second side lower gear 67 → the second side upper gear 62, the second side upper gear 62 being coaxially provided with the threaded rod 63, so that when the second side upper gear 62 rotates, the threaded rod 63 rotates synchronously, and the sensor sleeve 8 extending into the spiral groove of the threaded rod 63 moves linearly at a constant speed with respect to the connecting shaft 58.
Further, the linear adjusting device 6 further comprises a circular baffle plate 64 which is attached and sealed with the lower plate surface of the bearing plate 2, wherein the circular baffle plate 64 is not fixed with the bearing plate 2 and only attached to the lower plate surface of the bearing plate 2, and the circular baffle plate 64 can rotate when the circular baffle plate 64 and the bearing plate 2 form a seal; the axis of circular baffle 64, the axis of bearing plate 2 and the axis of main shaft gear 51 are identical, and the area of circular baffle 64 should be able to cover all gas pockets 21 on the bearing plate 2, the notch 641 that holds horizontal rail 65 has been seted up on the circular baffle 64, the upper surface of horizontal rail 65 is parallel and level with the last face of circular baffle 64 mutually, be equipped with the sensor endotheca 651 that supplies gas pressure sensor 7 to pass in the horizontal rail 65, circular baffle 64 links to each other with rotation adjusting device 5 and realizes rotating, horizontal rail 65 is along the direction rectilinear motion that notch 641 is prescribed a limit. The circular baffle 64 and the cross rail 65 can block the non-measured air holes 21 at any time during measurement.
Specifically, a square notch 641 is formed in the circular baffle plate 64 from the edge to the center, a transverse rail 65 is arranged in the notch 641, the upper surface of the transverse rail 65 is flush with the upper surface of the circular baffle plate 64, the lower surface of the transverse rail 65 abuts against the upper surface of the sensor guide rail 59, a sensor inner sleeve 651 matched with the gas pressure sensor 7 is arranged in the transverse rail 65, a through hole 652 is formed in the upper surface of the transverse rail 65 at a position matched with the sensor inner sleeve 651 so that the upper surface of the gas pressure sensor 7 is flush with the upper surface of the transverse rail 65, namely, the gas pressure sensor 7 is positioned on the lower plate surface of the pressure bearing plate 2, the circular baffle plate 64 is driven to rotate by the connecting shaft 58 integrated with the main shaft 56, and the transverse rail 65 is driven by the gas pressure sensor 7 to linearly move along the direction defined by,
more specifically, as shown in fig. 10, the transverse rail 65 is a groove body with an inverted U-shaped cross section, and includes a top plate 653 and two second side plates 654, an upper plate surface of the top plate 653 is a stepped surface with a higher height and a lower height, wherein: the high step surface is flush with the upper plate surface of the circular baffle plate 64, and the low step surface is attached to the lower plate surface of the circular baffle plate 64;
the lower plate surface of the circular baffle plate 64 is provided with a first baffle plate 68 and a second baffle plate 69 which are arranged in the vertical direction, the first baffle plate 68 and the second baffle plate 69 are symmetrically arranged at two sides of the notch 641, the inner plate surfaces of the first baffle plate 68 and the second baffle plate 69 are respectively attached to the outer plate surfaces of the two second side plates 654, the inner plate surfaces of the first baffle plate 68 and the second baffle plate 69 are upwards formed into square step surfaces from the bottoms, and the step surfaces are attached to and fixed with the top surface and the side surface of the sensor guide rail 59.
Further, as shown in fig. 7, 8 and 9, the gas pressure sensor 7 is connected to the sensor guide rail 59 through the sensor sleeve 8, the sensor sleeve 8 includes a sleeve body 81, a sleeve step 82 and a sleeve tail rod 83, which are sequentially connected from top to bottom to form a whole, the sleeve body 81 is used for placing the gas pressure sensor 7, the sleeve step 82 is used for limiting the movement direction of the sensor sleeve 8, the sleeve tail rod 83 penetrates through the sensor guide rail 59, and the end of the sleeve tail rod 83 is located in the spiral groove of the threaded rod 63.
Further, the cross section of the sensor guide rail 59 is U-shaped, and is composed of a bottom plate 591 and two first side plates 592, a guide rail groove 593 for the sleeve tail rod 83 to pass through is formed in the bottom plate 591, and T-shaped grooves 594 matched with the sleeve steps 82 are formed in the inner plate surfaces of the two first side plates 592 respectively and upwards from the bottom. During installation, the gas pressure sensor 7 is installed in the sleeve body 81, the sleeve body 81 is installed on the sensor guide rail 59, the edge of the sleeve step 82 is clamped in the T-shaped groove 594, the sleeve tail rod 83 is clamped in the spiral groove of the threaded rod 63 and is in non-fixed connection with the spiral groove, and when the threaded rod 63 rotates, the sensor sleeve 8 moves linearly under the limit of the guide rail groove 593 and the T-shaped groove 594.
Further, assuming that one intermittent motion is one cycle, the radial movement distance L of the gas pressure sensor per unit cycle is calculated as follows:
wherein: p is the lead of the threaded rod;
Z4the number of teeth of the second partial gear;
Z5the number of teeth of the stepped shaft gear;
Z6the number of teeth of the second spoke type gear;
Z7the number of teeth of the main shaft gear;
Z8the number of teeth of the sleeve gear;
Z9the number of teeth of the main bevel gear;
Z10the number of teeth of the gear on the first side;
Z11the number of teeth of the first side lower gear is shown;
Z12the number of teeth of the second side lower gear is shown;
Z13the number of teeth of the gear on the second side;
Z14the number of teeth of the side bevel gear;
in this embodiment: the model number of the motor 3 is 70YS40-10, the rated power is 40W, the rated rotating speed is 600r/min, the rated torque is 2.0 N.m, the total transmission ratio of the speed reducer is 10, and the rotating speed of the output shaft of the motor after speed reduction is 60 r/min. Wherein: the number of teeth of the driving gear being Z1The number of teeth of the first spoke is Z2The number of teeth of the first partial gear is Z3The number of teeth of the second partial gear is Z4The number of teeth of the stepped shaft gear is Z5The number of teeth of the second radial gear is Z6The number of teeth of the main shaft gear is Z7The number of teeth of the sleeve gear is Z8The number of teeth of the main bevel gear is Z9The number of teeth of the gear on the first side is Z10The number of teeth of the first side lower gear is Z11The number of teeth of the second side lower gear is Z12The number of teeth of the gear on the second side is Z13The number of teeth of the side bevel gear is Z14The lead P of the threaded rod is 20 mm.
Since the intermittent adjustment device 4 includes an incomplete gear, the above formula is not substituted into Z1、Z2、Z3But the intermittent movement of the second incomplete gear 44 is once recorded as one cycle. According to the transmission ratio of the motor, the rotation period of the second incomplete gear is 3s, the meshing time is 1.5s, correspondingly, the second incomplete gear rotates 90 degrees, the main shaft rotates 30 degrees, the relative rotation angle is changed to 37.5 degrees after being adjusted by the rotary adjusting device 5, the gear on the main side rotates 75 degrees under the action of the linear adjusting device 6, and the radial moving distance L of the intermittent motion of the gas pressure sensor in a unit period is 4.17mm according to the calculation of the formula.
The working process and the working principle of the invention are as follows:
as shown in fig. 11, during measurement, the nozzle 9 is disposed right above the pressure-bearing plate 2 to spray a pressure air flow to the pressure-bearing plate 2, the motor 3 drives the gas pressure sensor 7 to intermittently move along the spiral line on the threaded rod 63 through the intermittent adjusting device 4, the rotary adjusting device 5 and the linear adjusting device 6, as shown in fig. 8, the gas pressure sensor 7 is disposed at the starting end of the threaded rod 63, and measurement starts; the gas pressure sensor 7 moves to the tail end of the threaded rod 63, and the measurement is finished; when the gas pressure sensor 7 moves to the position right below the gas hole 21, the whole device stops moving, the gas pressure sensor 7 captures and measures the pressure at the gas hole 21 on the pressure bearing plate 2, and the transverse rail 65 and the circular baffle 64 block other gas holes which are not measured at the moment.
The invention has the beneficial effects that:
1) the invention realizes the intermittent movement of the gas pressure sensor along the spiral line on the threaded rod through the intermittent adjusting device, the rotary adjusting device and the linear adjusting device, and can realize the rapid measurement of the pressure distribution of different distances between the nozzle and the bearing plate and the distances between different measuring points and the center of the jet flow through the gas pressure sensor under the condition that the bearing plate is fixed and does not move only by one motor;
2) the invention only adopts a single gas pressure sensor for measurement, thereby obviously reducing the cost and getting rid of the space limitation caused by the size of the sensor;
3) the gas holes are spirally arranged on the bearing plate, the gas holes have the characteristics of dense middle and loose outer circle, and the characteristics of high central area, quick change, low pressure of the outer circle area and small change of the pressure of the gas impact jet flow are corresponded, so that the data acquisition amount can be reduced, the space difference value is convenient, and the measurement efficiency is improved;
4) the invention has strong applicability, key parts can be independently disassembled, and the damaged parts can be quickly replaced by the modularized assembly process.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. The utility model provides a gaseous impact efflux pressure measurement device based on intermittent type formula screw motion mechanism which characterized in that: the device comprises a shell (1) and a bearing plate (2) arranged at the top of the shell (1), wherein a hollow closed cavity is formed between the shell (1) and the bearing plate (2), air holes (21) which are spirally arranged are formed in the bearing plate (2) from the central point to the outer side, a motor (3), an intermittent adjusting device (4), a rotary adjusting device (5), a linear adjusting device (6) and a gas pressure sensor (7) are arranged in the closed cavity, and a driving gear (31) is fixed on an output shaft of the motor (3);
the intermittent adjusting device (4) comprises a first spoke type gear (41) serving as an input gear and a second spoke type gear (42) serving as an output gear, the first spoke type gear (41) is meshed with the driving gear (31), and an incomplete gear mechanism enabling the second spoke type gear (42) to realize intermittent motion is arranged between the first spoke type gear (41) and the second spoke type gear (42);
the rotation adjusting device (5) comprises a main shaft gear (51) serving as an input gear and a main bevel gear (52) serving as an output gear, the main shaft gear (51) is meshed with the second spoke type gear (42), and a speed change mechanism for changing the rotating speed of the main bevel gear (52) is arranged between the main shaft gear (51) and the main bevel gear (52);
the linear adjusting device (6) comprises a side bevel gear (61) serving as an input gear and a second side upper gear (62) serving as an output gear, the side bevel gear (61) is meshed with the main bevel gear (52), the second side upper gear (62) is connected with a threaded rod (63), and a sensor sleeve (8) used for mounting a gas pressure sensor (7) is arranged in a spiral groove of the threaded rod (63); straight line adjusting device (6) still include with the lower plate surface laminating of bearing plate (2) and sealed circular baffle (64), the axis of bearing plate (2) and the axis of main shaft gear (51) are identical, and circular baffle (64) the area should be able to cover all gas pockets (21) on bearing plate (2), circular baffle (64) on set up notch (641) that hold cross rail (65), the upper surface of cross rail (65) is parallel and level with the last face of circular baffle (64) mutually, cross rail (65) in be equipped with sensor endotheca (651) that air supply pressure intensity sensor (7) passed, circular baffle (64) link to each other with rotation adjusting device (5) and realize the rotation, cross rail (65) along the direction linear motion that notch (641) were prescribed a limit.
2. The intermittent screw motion mechanism based gas impact jet flow pressure measuring device according to claim 1, characterized in that: intermittent type adjusting device (4) including being first gear shaft (46), second gear shaft (47) and third gear shaft (48) that the vertical direction arranged, first gear shaft (46) from the top down coaxial be equipped with first spoke formula gear (41) and first incomplete gear (43), second gear shaft (47) from bottom up coaxial be equipped with second incomplete gear (44) and step shaft gear (45), third gear shaft (48) on be equipped with second spoke formula gear (42), wherein: the first spoke type gear (41) is meshed with the driving gear (31), the first incomplete gear (43) and the second incomplete gear (44) are matched to form an incomplete gear mechanism, the stepped shaft gear (45) is meshed with the second spoke type gear (42), the second spoke type gear (42) is meshed with the main shaft gear (51), and when the gear teeth of the first incomplete gear (43) are meshed with the gear teeth on the second incomplete gear (44), the second gear shaft (47) performs rotary motion; when the locking circular arc on the first incomplete gear (43) is tangent to the locking circular arc on the second incomplete gear (44), the second gear shaft (47) stops rotating.
3. The intermittent screw motion mechanism based gas impact jet flow pressure measuring device according to claim 2, characterized in that: the bottom parts of the first gear shaft (46), the second gear shaft (47) and the third gear shaft (48) are respectively fixed with a first base (11) arranged on a bottom plate of the shell (1) through first bearings, the first base (11) is an L-shaped bending plate, the first gear shaft (46), the third gear shaft (48) and the second gear shaft (47) are respectively arranged at two ends and bending positions of the first base (11), the first gear shaft (46) and the second gear shaft (47) are respectively stepped shafts, and the first incomplete gear (43) and the second incomplete gear (44) are respectively arranged at shaft shoulders of the stepped shafts.
4. The intermittent screw motion mechanism based gas impact jet flow pressure measuring device according to claim 1, characterized in that: the rotation adjusting device (5) comprises a main shaft (56) and a side shaft (57) which are arranged in the vertical direction, the main shaft (56) is located at the center of a bottom plate of the shell (1), the main shaft (56) is coaxially provided with a main bevel gear (52), a sleeve gear (53) and a main shaft gear (51) from top to bottom, the main bevel gear (52) and the sleeve gear (53) are respectively fixed on a main shaft sleeve (561), the main shaft sleeve (561) is connected with the main shaft (56) through a bearing, the side shaft (57) is coaxially provided with a first side lower gear (54) and a first side upper gear (55) from bottom to top, the number of teeth of the main shaft gear (51) and the first side upper gear (55) is equal, the number of teeth of the sleeve gear (53) and the first side lower gear (54) is equal, and the first side lower gear (54), the first side upper gear (55) and the number of the first side upper gear (55), The sleeve gear (53) cooperates with the main shaft gear (51) to form a speed change mechanism, wherein: the main shaft gear (51) is respectively meshed with the second spoke type gear (42) and the first side lower gear (54), the first side upper gear (55) is meshed with the sleeve gear (53), and the main bevel gear (52) is meshed with the side bevel gear (61).
5. The intermittent screw motion mechanism based gas impact jet flow pressure measuring device according to claim 4, wherein: the bottom of main shaft (56) and side shaft (57) is fixed mutually through second bearing and third bearing and second base (12) and third base (13) of setting on casing (1) bottom plate respectively, the top of main shaft (56) is equipped with connecting axle (58) that are used for connecting linear adjusting device (6), the top of connecting axle (58) is equipped with sensor guide rail (59) that the horizontal direction was arranged, connecting axle (58) on be equipped with respectively with threaded rod (63) and main side pole (66) matched with threaded rod hole (581) and main side pole hole (582), main shaft (56), connecting axle (58) and sensor guide rail (59) integrated into one piece.
6. The intermittent screw motion mechanism based gas impact jet flow pressure measuring device according to claim 5, characterized in that: the linear adjusting device (6) comprises a threaded rod (63) and a main side rod (66), wherein the threaded rod (63) and the main side rod (66) are horizontally arranged in the vertical direction, one end of the threaded rod (63) is connected with an optical axis (631), the threaded rod (63) and the optical axis (631) are of an integrated structure, the optical axis (631) vertically penetrates through the connecting shaft (58), and a second side upper gear (62) is arranged at the end part of the optical axis (631); the both ends of main side pole (66) perpendicular through connection axle (58) and main side pole (66) be equipped with second side lower gear (67) and side bevel gear (61) respectively, wherein: the second side upper gear (62) is meshed with the second side lower gear (67), and the side bevel gear (61) is meshed with the main bevel gear (52).
7. The intermittent screw motion mechanism based gas impact jet flow pressure measuring device according to claim 1, characterized in that: the gas pressure sensor (7) is connected with the sensor guide rail (59) through the sensor sleeve (8), the sensor sleeve (8) comprises a sleeve body (81), a sleeve step (82) and a sleeve tail rod (83) which are sequentially connected into a whole from top to bottom, the sleeve body (81) is used for placing the gas pressure sensor (7), the sleeve step (82) is used for limiting the movement direction of the sensor sleeve (8), and the sleeve tail rod (83) penetrates through the sensor guide rail (59) and the end part of the sleeve tail rod (83) is located in a spiral groove of the threaded rod (63).
8. The intermittent screw motion mechanism based gas impact jet flow pressure measuring device according to claim 5, characterized in that: the section of the sensor guide rail (59) is U-shaped and consists of a bottom plate (591) and two first side plates (592), a guide rail groove (593) for the sleeve tail rod (83) to penetrate through is formed in the bottom plate (591), and T-shaped grooves (594) matched with the sleeve steps (82) are formed in the upward direction of the inner plate surface of the two first side plates (592) from the bottom respectively.
9. The intermittent screw motion mechanism based gas impact jet flow pressure measuring device according to claim 1, characterized in that: the round baffle (64) is provided with a square notch (641) from the edge to the center, a transverse rail (65) is arranged in the notch (641), the upper surface of the transverse rail (65) is flush with the upper surface of the circular baffle plate (64), the lower surface of the transverse rail (65) is abutted against the upper surface of the sensor guide rail (59), a sensor inner sleeve (651) matched with the gas pressure sensor (7) is arranged in the transverse rail (65), the upper surface of the transverse rail (65) is provided with a through hole (652) at the position which is matched with the sensor inner sleeve (651) so as to ensure that the upper surface of the gas pressure sensor (7) is flush with the upper surface of the transverse rail (65), the round baffle plate (64) is driven to rotate by a connecting shaft (58) integrated with the main shaft (56), the transverse rail (65) is driven by the gas pressure sensor (7) to move linearly along the direction limited by the notch (641).
10. The intermittent screw motion mechanism based gas impact jet flow pressure measuring device according to claim 1, characterized in that: horizontal rail (65) be the cell body that the cross-section is the type of falling U, including roof (653) and two second curb plates (654), the last face of roof (653) is the step face that a height is low, wherein: the high step surface is flush with the upper plate surface of the circular baffle plate (64), and the low step surface is attached to the lower plate surface of the circular baffle plate (64);
the lower plate surface of the circular baffle plate (64) is provided with a first baffle plate (68) and a second baffle plate (69) which are arranged in the vertical direction, the first baffle plate (68) and the second baffle plate (69) are symmetrically arranged on two sides of the notch (641), the inner plate surfaces of the first baffle plate (68) and the second baffle plate (69) are respectively attached to the outer plate surfaces of the two second side plates (654), the inner plate surfaces of the first baffle plate (68) and the second baffle plate (69) upwards form a square step surface from the bottom, and the step surface is attached to and fixed to the top surface and the side surface of the sensor guide rail (59).
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