CN110095226B - Gas impact jet flow pressure measuring device based on intermittent type spiral motion mechanism - Google Patents

Abstract

The invention relates to a gas impact jet pressure measuring device based on an intermittent spiral motion mechanism. It includes a casing and a pressure-bearing plate arranged on the top of the casing. A hollow airtight cavity is formed between the casing and the pressure-bearing plate. A motor, an intermittent adjustment device, a rotation adjustment device, a linear adjustment device and a gas pressure sensor are arranged in the closed cavity, and a drive gear is fixed on the output shaft of the motor. It can be seen from the above technical solutions that the present invention realizes the intermittent movement of the gas pressure sensor along the helical line on the threaded rod through the intermittent adjustment device, the rotation adjustment device and the linear adjustment device, so that only one motor can be used to fix the pressure plate without moving. The gas pressure sensor is used to quickly measure the pressure distribution of different distances between the nozzle and the pressure-bearing plate, and between different measurement points and the center of the jet.

Description

A gas impingement jet pressure measuring device based on intermittent helical motion mechanism

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 technique

Gas impingement jets are widely used in many technical fields such as ventilators, chemical equipment and jet aircraft. The actual situation cannot be completely simulated by the software, so it is necessary to conduct experiments on the designed pneumatic nozzle to verify its performance. The main measurement schemes currently used are as follows: 1. Multiple sensors are used to measure the pressure of the jet impinging surface. This solution requires the sensor to have a higher response frequency and a more flexible arrangement. At the same time, the requirements for accuracy are also very strict, and the measurement cost is also large. Taking the domestic Shanghai Tianmu NS-1 model as an example, the price of a single sensor is 3000 yuan or more. 2. Adopt pressure-sensitive coating pressure measurement technology. Although this technology can directly measure the distribution of surface pressure, the equipment is expensive and the measurement process is complicated, requiring CCD cameras, pressure-sensitive paint, fluorescent lamps, etc. The price of the equipment ranges from tens of thousands to hundreds of thousands. changes, thereby affecting the measurement results. 3. Using thin film sensor. Thin-film sensors can directly measure the surface pressure distribution, but they are expensive, limited in range and accuracy. In addition, in actual operation, there are many gas jet impingement conditions, and it is difficult for the above-mentioned traditional measurement schemes to achieve efficient and general measurement.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and to provide a gas impact jet pressure measuring device based on an intermittent spiral motion mechanism.

In order to achieve the above purpose, the present invention adopts the following technical scheme: comprising a casing and a pressure-bearing plate arranged on the top of the casing, a hollow closed cavity is formed between the casing and the pressure-bearing plate, and the pressure-bearing plate is formed between the casing and the pressure-bearing plate. The pressure plate is provided with spirally arranged air holes from the center point to the outside. The closed cavity is provided with a motor, an intermittent adjustment device, a rotation adjustment device, a linear adjustment device and a gas pressure sensor. The output shaft of the motor is provided with a motor. Fixed drive gear;

The intermittent adjustment device includes a first spoke gear as an input gear and a second spoke gear as an output gear, the first spoke gear is meshed with the drive gear, the first spoke gear and An incomplete gear mechanism is arranged between the second spoke gears to enable the second spoke gears to achieve intermittent motion;

The rotation adjusting device includes a main shaft gear as an input gear and a main bevel gear as an output gear, the main shaft gear meshes with the second spoke gear, and there is a change between the main shaft gear and the main bevel gear. The speed change mechanism of the main bevel gear;

The linear adjustment device includes a side bevel gear as an input gear and a second side upper gear as an output gear, the side bevel gear meshes with the main bevel gear, and the second side upper gear is connected with a threaded rod , the spiral groove of the threaded rod is provided with a sensor sleeve for installing the gas pressure sensor; the linear adjustment device also includes a circular baffle that is fitted and sealed with the lower plate surface of the pressure-bearing plate. The central axis of the shaped baffle, the central axis of the bearing plate and the central axis of the main shaft gear are consistent, and the area of the circular baffle should cover all the air holes on the bearing plate, and the circular baffle is provided with A slot for accommodating a horizontal rail, the upper surface of the horizontal rail is flush with the upper plate surface of the circular baffle, the horizontal rail is provided with a sensor inner sleeve for the gas pressure sensor to pass through, and the circular The baffle is connected with the rotation adjusting device to realize rotation, and the transverse rail moves linearly along the direction defined by the slot.

The intermittent adjustment device includes a first gear shaft, a second gear shaft and a third gear shaft arranged in a vertical direction, and the first gear shaft is coaxially provided with a first spoke gear and a third gear shaft from top to bottom. An incomplete gear, 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 gear, wherein: the first spoke The first incomplete gear meshes with the driving gear, the first incomplete gear cooperates with the second incomplete gear to form an incomplete gear mechanism, the stepped shaft gear meshes with the second spoke gear, and the second spoke gear meshes with the main shaft gear. When the gear teeth of the first incomplete gear mesh with the gear teeth on the second incomplete gear, the second gear shaft performs rotational motion; when the locking arc on the first incomplete gear meshes with the second incomplete gear When the locking arcs are tangent to each other, the second gear shaft stops rotating.

The bottoms 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 casing through a first bearing, and 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 both ends of the first base and at the bends, and the first gear shaft and the second gear shaft are respectively stepped shafts, The first incomplete gear and the second incomplete gear are respectively arranged at the shoulders of the stepped shaft.

The rotation adjustment device includes a main shaft and a side shaft arranged in a vertical direction, the main shaft is located at the center of the bottom plate of the casing, and the main shaft is coaxially provided with a main bevel gear, a sleeve gear and a main shaft gear from top to bottom. , the main bevel gear and the sleeve gear are respectively fixed on the main shaft sleeve, the main shaft sleeve is connected with the main shaft through a bearing, and the side shaft is coaxially provided with a first side lower gear and a first side lower gear from bottom to top. Side upper gear, the main shaft gear and the first side upper gear have the same number of teeth, the sleeve gear and the first side lower gear have the same number of teeth, the first side lower gear, the first side upper gear, the sleeve The gear and the main shaft gear cooperate to form a speed change mechanism, wherein: the main shaft gear meshes with the second spoke gear and the first side lower gear respectively, the first side upper gear meshes with the sleeve gear, and the main bevel gear and the side bevel gear are meshed with each other. The gears mesh.

The bottoms of the main shaft and the side shaft are respectively fixed with the second base and the third base arranged on the bottom plate of the casing through the second bearing and the third bearing, and the top of the main shaft is provided with a connecting shaft for connecting the linear adjustment device , the top of the connecting shaft is provided with a sensor guide rail arranged in a horizontal direction, and the connecting shaft is respectively provided with a threaded rod hole and a main side rod hole which are matched with the threaded rod and the main side rod. The shaft and sensor rail are integrally formed.

The linear adjustment device includes a threaded rod and a main side rod arranged horizontally in the up and down direction, one end of the threaded rod is connected with an optical axis, the threaded rod and the optical axis are integrated in structure, and the optical axis is vertically penetrated and connected. The end of the shaft and the optical axis is provided with a second side upper gear; the main side rod vertically penetrates the connecting shaft, and the two ends of the main side rod are respectively provided with a second side lower gear and a side bevel gear, wherein: the second side The upper gear meshes with the second side lower gear, and the side bevel gear meshes with the main bevel gear.

The gas pressure sensor is connected with the sensor guide rail through a sensor sleeve, and the sensor sleeve includes a sleeve body, a sleeve step and a sleeve tail rod that are sequentially connected from top to bottom as a whole. The sleeve body It is used to place the gas pressure sensor, the sleeve step is used to limit the movement direction of the sensor sleeve, the sleeve tail rod penetrates the sensor guide rail, and the end of the sleeve tail rod is located in the spiral groove of the threaded rod.

The section of the sensor guide rail is U-shaped and consists of a bottom plate and two first side plates. The bottom plate is provided with a guide rail groove for the sleeve tail rod to pass through. T-shaped grooves which are matched with the steps of the sleeve are respectively provided on the plate surface upwards from the bottom.

The circular baffle is provided with a square notch from the edge to the center, the notch is provided with a transverse rail, the upper surface of the transverse rail is flush with the upper surface of the circular baffle, and the transverse The lower surface of the rail abuts against the upper surface of the sensor guide rail, the horizontal rail is provided with a sensor inner sleeve that matches the gas pressure sensor, and the upper surface of the horizontal rail is provided with a position matching the sensor inner sleeve. The through hole makes the upper surface of the gas pressure sensor flush with the upper surface of the horizontal rail, the circular baffle is driven to rotate by the connecting shaft integrated with the main shaft, and the horizontal rail is driven by the gas pressure sensor along the horizontal rail. Linear movement in the direction defined by the notch.

The cross rail is a groove body with an inverted U-shaped cross-section, including a top plate and two second side plates. The upper surface of the baffle is flush, and the lower stepped surface is fitted with the lower surface of the circular baffle;

The lower plate surface of the circular baffle is provided with a first baffle and a second baffle arranged in a vertical direction, the first baffle and the second baffle are symmetrically arranged on both sides of the slot, and the The inner plate surfaces of the first baffle and the second baffle are respectively fitted with the outer plate surfaces of the two second side plates, and the inner plate surfaces of the first baffle and the second baffle form a square step from the bottom upwards The stepped surface is attached and fixed to the top surface and the side surface of the sensor guide rail.

It can be seen from the above technical solutions that the present invention realizes the intermittent movement of the gas pressure sensor along the helical line on the threaded rod through the intermittent adjustment device, the rotation adjustment device and the linear adjustment device, so that only one motor can be used to fix the pressure plate without moving. The gas pressure sensor is used to quickly measure the pressure distribution of different distances between the nozzle and the pressure-bearing plate, and between different measurement points and the center of the jet.

Description of drawings

Fig. 1 is the structural representation of the present invention;

2 is a schematic diagram of the internal structure of the present invention after removing the casing and the pressure-bearing plate;

Fig. 3 is the structural representation of the intermittent adjustment device of the present invention;

Fig. 4 is the structural representation of the rotation adjustment device of the present invention;

Fig. 5 is the structural representation of the connecting shaft and the linear adjusting device of the present invention;

Fig. 6 is the exploded view of Fig. 5;

7 is a schematic diagram of the connection between the sensor guide rail and the sensor sleeve of the present invention;

Fig. 8 is the initial state diagram of the movement of the gas pressure sensor of the present invention;

Fig. 9 is the cut-off state diagram of the movement of the gas pressure sensor of the present invention;

Fig. 10 is the structural representation of the cross rail of the present invention;

Fig. 11 is a use state diagram of the present invention.

The symbols in the attached drawings are:

1-shell, 11-first base, 12-second base, 13-third base, 2-pressure plate, 21-air hole, 3-motor, 31-drive gear, 4-intermittent adjustment device, 41- First spoke gear, 42 - Second spoke gear, 43 - First incomplete gear, 44 - Second incomplete gear, 45 - Step shaft gear, 46 - First gear shaft, 47 - Second gear shaft, 48-Third gear shaft, 5-Rotation adjustment device, 51-Main shaft gear, 52-Main bevel gear, 53-Set of gears, 54-First side lower gear, 55-First side upper gear, 56-Main shaft, 561 -Spindle Sleeve, 57-Side Shaft, 58-Connecting Shaft, 581-Threaded Rod Hole, 582-Main Side Rod Hole, 59-Sensor Rail, 591-Base Plate, 592-First Side Plate, 593-Guide Slot, 594 -T-slot, 6-linear adjustment device, 61-side bevel gear, 62-second side upper gear, 63-threaded rod, 631-optical shaft, 64-round baffle, 641-notch, 65-horizontal 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 gear Plate, 7-gas pressure sensor, 8-sensor sleeve, 81-sleeve body, 82-sleeve step, 83-sleeve tail rod, 9-nozzle.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings:

As shown in Figures 1 and 2, a gas impingement jet pressure measuring device based on an intermittent screw motion mechanism includes a casing 1 and a pressure-bearing plate 2 arranged on the top of the casing 1. The casing 1 and the pressure-bearing plate 2 A hollow airtight cavity is formed between them. The pressure bearing plate 2 is provided with spirally arranged air holes 21 from the center point to the outside. The airtight cavity is provided with a motor 3, an intermittent adjustment device 4, a rotation adjustment device 5, and a linear adjustment device. For the device 6 and the gas pressure sensor 7, a drive gear 31 is fixed on the output shaft of the motor 3, and the motor 3 is connected to the output shaft of the motor 3 through a reducer and a coupling. The characteristics of the arrangement of the air holes 21 in the present invention are that the points are selected based on the Archimedes spiral, and the point-taking rule is that the angle difference θ between two adjacent points is a fixed value, and the radial displacement r is a fixed value. Point-by-point measurement is carried out in a Cartesian coordinate system with pressure as the ordinate and θ and r as the abscissa. The air holes 21 are arranged in a spiral manner, which has the characteristics of dense middle and loose outer circle. Corresponding to the characteristics of high pressure and rapid change in the center area of the gas impact jet, and low pressure and small change in the outer circle area, the amount of data collection can be reduced and the space is convenient. difference to improve measurement efficiency.

Further, as shown in FIG. 3 , the intermittent adjusting 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 meshes with the drive gear 31, Between the spoke gear 41 and the second spoke gear 42, there is an incomplete gear mechanism that enables the second spoke gear 42 to achieve intermittent motion;

Specifically, the intermittent adjustment device 4 includes a first gear shaft 46 , a second gear shaft 47 and a third gear shaft 48 arranged in a vertical direction. The first gear shaft 46 is coaxially provided with a first spoke type from top to bottom. The gear 41 and the first incomplete gear 43, the second gear shaft 47 are coaxially provided with a second incomplete gear 44 and a stepped shaft gear 45 from bottom to top, and the third gear shaft 48 is provided with a second spoke gear 42, wherein : The first spoke gear 41 meshes with the drive gear 31, the first incomplete gear 43 cooperates with the second incomplete gear 44 to form an incomplete gear mechanism, the stepped shaft gear 45 meshes with the second spoke gear 42, The two-spoke gear 42 meshes with the main shaft gear 51. When the teeth of the first incomplete gear 43 mesh with the teeth of the second incomplete gear 44, the second gear shaft 47 rotates; When the locking arc on the complete 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 adjusting device 4 is: drive gear 31 → first spoke gear 41 → first incomplete gear 43 → second incomplete gear 44 → stepped shaft gear 45 → 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 provided on the bottom plate of the housing 1 through first bearings, and the first base 11 is For the L-shaped bent plate, the first gear shaft 46 , the third gear shaft 48 and the second gear shaft 47 are respectively arranged at both ends of the first base 11 and at the bends, the first gear shaft 46 and the second gear shaft 47 They are respectively stepped shafts, and the first incomplete gear 43 and the second incomplete gear 44 are respectively arranged at the shoulders of the stepped shaft.

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 gear 52 is provided with a speed change mechanism for changing the rotational speed of the main bevel gear 52;

Specifically, the rotation adjustment device 5 includes a main shaft 56 and a side shaft 57 arranged in a vertical direction. The main shaft 56 is located at the center of the bottom plate of the housing 1 , and the main shaft 56 is coaxially provided with a main bevel gear 52 and a sleeve gear 53 from top to bottom. And the main shaft gear 51, the main bevel gear 52 and the sleeve gear 53 are respectively fixed on the main shaft sleeve 561, the main shaft sleeve 561 is connected with the main shaft 56 through the bearing, the side shaft 57 is coaxially provided with the first side lower gear 54 and The first side upper gear 55, the main shaft gear 51 and the first side upper gear 55 have the same number of teeth, the sleeve gear 53 and the first side lower gear 54 have the same number of teeth, the first side lower gear 54, the first side upper gear 55, the sleeve The gear 53 cooperates with the main shaft gear 51 to form a speed change mechanism, and its function is to make the rotation speed of the sleeve gear 53 and the main shaft gear 51 different, so that the rotation speed of the main bevel gear 52 and the main shaft gear 51 are different; The second spoke gear 42 meshes with 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 .

The gear transmission sequence in the rotation adjusting device 5 is: the second spoke gear 42 → the main shaft gear 51 → the first side lower gear 54 → the first side upper gear 55 → the sleeve gear 53 → the main bevel gear 52 .

More specifically, the bottoms of the main shaft 56 and the side shaft 57 are respectively fixed to the second base 12 and the third base 13 arranged on the bottom plate of the casing 1 through the second bearing and the third bearing. The connecting shaft 58 of the linear adjusting device 6 is connected. The top of the connecting shaft 58 is provided with a sensor guide rail 59 arranged in a horizontal direction. The side rod hole 582, the main shaft 56, the connecting shaft 58 and the sensor guide rail 59 are integrally formed.

Further, as shown in FIG. 4 , FIG. 5 , and FIG. 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 in phase with the main bevel gear 52 . Meshing, the upper gear 62 on the second side is connected with the threaded rod 63, and the helical groove of the threaded rod 63 is provided with a sensor sleeve 8 for installing the gas pressure sensor 7;

Specifically, the linear adjusting device 6 includes a threaded rod 63 and a main side rod 66 arranged horizontally in the vertical direction. One end of the threaded rod 63 is connected with an optical axis 631. The connecting shaft 58 and the end of the optical axis 631 are provided with a second side upper gear 62 ; the main side rod 66 vertically penetrates the connecting shaft 58 and both ends of the main side rod 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 rod hole 581 through a bearing, and the main side rod 66 is connected with the main side rod hole 582 through a bearing, wherein: the second side upper gear 62 meshes with the second side lower gear 67, and the side bevel gear 61 and The main bevel gear 52 meshes.

The gear transmission sequence in the linear adjusting device 6 is: the main bevel gear 52→the side bevel gear 61→the second side lower gear 67→the second side upper gear 62, and the second side upper gear 62 and the threaded rod 63 are coaxially arranged, so When the upper gear 62 on the second side rotates, the threaded rod 63 rotates synchronously. At this time, the sensor sleeve 8 extending into the helical groove of the threaded rod 63 performs a uniform linear motion relative to the connecting shaft 58 .

Further, the linear adjustment device 6 also includes a circular baffle 64 that is fitted and sealed with the lower surface of the pressure-bearing plate 2 , and the circular baffle 64 here has no fixed relationship with the pressure-bearing plate 2 , but is only attached On the lower surface of the pressure-bearing plate 2, while the circular baffle 64 forms a seal with the pressure-bearing plate 2, the circular baffle 64 itself can also rotate. In this embodiment, the pressure-bearing plate 2 and the circular baffle 64 are both It is made of polytetrafluoroethylene material, which has the characteristics of low friction, smooth surface, easy sealing and relative movement, so it can realize the sealing of the pressure bearing plate 2 and the circular baffle 64; the circular baffle The central axis of 64, the central axis of the bearing plate 2 and the central axis of the main shaft gear 51 are consistent, and the area of the circular baffle 64 should be able to cover all the air holes 21 on the bearing plate 2, and the circular baffle 64 is provided with There is a notch 641 for accommodating the horizontal rail 65. The upper surface of the horizontal rail 65 is flush with the upper surface of the circular baffle 64. The horizontal rail 65 is provided with a sensor inner sleeve 651 for the gas pressure sensor 7 to pass through. The baffle 64 is connected with the rotation adjusting device 5 to realize rotation, and the transverse rail 65 moves linearly along the direction defined by the slot 641 . The function of the circular baffle 64 and the horizontal rail 65 is to block the non-measured air hole 21 at any time during measurement.

Specifically, the circular baffle 64 is provided with a square notch 641 from the edge to the center, the notch 641 is provided with a transverse rail 65 , and the upper surface of the transverse rail 65 is flush with the upper surface of the circular baffle 64 , the lower surface of the horizontal rail 65 abuts against the upper surface of the sensor guide rail 59, the horizontal rail 65 is provided with a sensor inner sleeve 651 that is matched with the gas pressure sensor 7, and the upper surface of the horizontal rail 65 matches the sensor inner sleeve 651. A through hole 652 is opened at the position so that the upper surface of the gas pressure sensor 7 is flush with the upper surface of the horizontal rail 65, that is, the gas pressure sensor 7 is located on the lower surface of the pressure-bearing plate 2, and the circular baffle 64 is formed by and The connecting shaft 58 integrated with the main shaft 56 drives it to rotate, and the horizontal rail 65 is driven by the gas pressure sensor 7 to move linearly along the direction defined by the notch 641 .

More specifically, as shown in FIG. 10 , the cross rail 65 is an inverted U-shaped groove body, including a top plate 653 and two second side plates 654, and the upper plate surface of the top plate 653 is a step surface with one high and one low. , wherein: the high stepped surface is flush with the upper surface of the circular baffle 64, and the low stepped surface is fitted with the lower surface of the circular baffle 64;

The lower surface of the circular baffle 64 is provided with a first baffle 68 and a second baffle 69 arranged in a vertical direction. The first baffle 68 and the second baffle 69 are symmetrically arranged on both sides of the slot 641. The inner surfaces of a baffle 68 and the second baffle 69 are respectively attached to the outer surfaces of the two second side plates 654 , and the inner surfaces of the first baffle 68 and the second baffle 69 form a square from the bottom up. The stepped surface is attached and fixed to the top surface and the side surface of the sensor guide rail 59 .

Further, as shown in FIGS. 7 , 8 and 9 , the gas pressure sensor 7 is connected to the sensor guide rail 59 through the sensor sleeve 8 , and the sensor sleeve 8 includes a sleeve body 81 , a sleeve body 81 and a sleeve that are sequentially connected from top to bottom as a whole. The barrel step 82 and the sleeve tail rod 83, the sleeve body 81 is used to place the gas pressure sensor 7, the sleeve step 82 is used to limit the movement direction of the sensor sleeve 8, the sleeve tail rod 83 penetrates the sensor guide rail 59 and the sleeve tail The end of the rod 83 is located in the helical groove of the threaded rod 63 .

Further, the section of the sensor guide rail 59 is U-shaped, and is composed of a bottom plate 591 and two first side plates 592. The bottom plate 591 is provided with a guide rail groove 593 for the sleeve tail rod 83 to pass through. The two first side plates 592 There are T-shaped grooves 594 which are matched with the sleeve steps 82 respectively from the bottom upwards on the inner plate surfaces of the two parts. 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 engaged in the T-shaped groove 594, and the sleeve tail rod 83 is clamped in the threaded rod. In the spiral groove of 63 , there is a non-fixed connection with the spiral groove. When the threaded rod 63 rotates, the sensor sleeve 8 moves linearly under the restriction of the guide groove 593 and the T-shaped groove 594 .

Further, assuming that an intermittent motion is a period, the calculation formula of the radial motion distance L of the gas pressure sensor in a unit period is as follows:

Where: P is the lead of the threaded rod;

Z ₄ is the number of teeth of the second incomplete gear;

Z ₅ is the number of teeth of the stepped shaft gear;

Z ₆ is the number of teeth of the second spoke gear;

Z ₇ is the number of teeth of the main shaft gear;

Z ₈ is the number of teeth of the set of gears;

Z ₉ is the number of teeth of the main bevel gear;

Z ₁₀ is the number of teeth of the gear on the first side;

Z ₁₁ is the number of teeth of the lower gear on the first side;

Z ₁₂ is the number of teeth of the lower gear on the second side;

Z ₁₃ is the number of teeth of the gear on the second side;

Z ₁₄ is the number of teeth of the side bevel gear;

In this embodiment: the model of the motor 3 is 70YS40-10, the rated power is 40W, the rated speed is 600r/min, the rated torque is 2.0N m, the total transmission ratio of the reducer is 10, and the output shaft of the motor is decelerated. The rotational speed is 60r/min. Among them: the number of teeth of the driving gear is Z ₁ , the number of teeth of the first spoke gear is Z ₂ , the number of teeth of the first incomplete gear is Z ₃ , the number of teeth of the second incomplete gear is Z ₄ , the number of teeth of the stepped shaft gear is Z _5. The number of teeth of the second spoke gear is Z ₆ , the number of teeth of the main shaft gear is Z ₇ , the number of teeth of the sleeve gear is Z ₈ , the number of teeth of the main bevel gear is Z ₉ , the number of teeth of the upper gear on the first side is Z ₁₀ , and the number of teeth of the first side gear is Z 10 . The number of teeth of the lower gear on one side is Z ₁₁ , the number of teeth of the lower gear on the second side is Z ₁₂ , the number of teeth of the upper gear on the second side is Z ₁₃ , the number of teeth of the side bevel gear is Z ₁₄ , and the lead of the threaded rod is P=20mm.

Since the intermittent adjustment device 4 includes incomplete gears, the above formulas are not substituted into Z ₁ , Z ₂ , and Z ₃ , but the intermittent movement of the second incomplete gear 44 is recorded as one cycle. It can be seen from the motor transmission ratio that the rotation period of the second incomplete gear is 3s, and the meshing time is 1.5s. Correspondingly, the second incomplete gear rotates 90°, the main shaft rotates 30°, and then adjusted by the rotation adjusting device 5. The relative rotation angle becomes 37.5°, and the upper gear on the main side rotates by 75° under the action of the linear adjusting device 6. According to the calculation of the above formula, the radial moving distance L of the intermittent motion of the gas pressure sensor per unit cycle is 4.17mm.

The working process and working principle of the present invention are as follows:

As shown in FIG. 11 , during the measurement, the nozzle 9 is placed directly above the pressure-bearing plate 2, and the pressure-bearing plate 2 is sprayed with compressed air, and the motor 3 is driven by the intermittent adjustment device 4, the rotation adjustment device 5, and the linear adjustment device 6. The gas pressure sensor 7 moves intermittently along the helix on the threaded rod 63. As shown in FIG. 8, the gas pressure sensor 7 is placed at the starting end of the threaded rod 63, and the measurement starts; the gas pressure sensor 7 moves to the end of the threaded rod 63, and the measurement End; when the gas pressure sensor 7 moves to just below the air hole 21, the whole device stops moving, the gas pressure sensor 7 captures and measures the pressure at the air hole 21 on the pressure plate 2, and the horizontal rail 65 and the circular baffle 64 are blocked. Other stomata that are not measured at this moment.

The beneficial effects of the present invention are:

1) The present invention realizes the intermittent movement of the gas pressure sensor along the helical line on the threaded rod through the intermittent adjustment device, the rotary adjustment device and the linear adjustment device. Realize the rapid measurement of the pressure distribution of different distances between nozzles and pressure-bearing plates, and between different measurement points and the center of the jet;

2) The present invention only uses a single gas pressure sensor for measurement, which significantly reduces the cost and gets rid of the space limitation caused by the size of the sensor;

3) The air holes of the present invention are arranged in a spiral pattern on the bearing plate. This method has the characteristics of dense middle and loose outer circle. The pressure in the center area corresponding to the gas impact jet is high and changes quickly, and the pressure in the outer circle area is low and changes. Small features can reduce the amount of data collection, facilitate spatial differences, and improve measurement efficiency;

4) The present invention has strong applicability, key components can be disassembled separately, and the modular assembly process enables quick replacement of damaged components.

The above-mentioned embodiments merely describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, those of ordinary skill in the art can make various modifications to the technical solutions of the present invention. Variations and improvements should fall within the protection scope determined by the claims of the present invention.

Claims (10)

1. A gas impact jet pressure measuring device based on an intermittent screw motion mechanism, characterized in that: comprising a casing (1) and a pressure-bearing plate (2) arranged on the top of the casing (1), the casing A hollow airtight cavity is formed between (1) and the pressure-bearing plate (2), the pressure-bearing plate (2) is provided with spirally arranged air holes (21) from the center point to the outside, A motor (3), an intermittent adjustment device (4), a rotation adjustment device (5), a linear adjustment device (6) and a gas pressure sensor (7) are arranged in the closed cavity, and an output shaft of the motor (3) is fixed with a drive gear (31); The intermittent adjustment device (4) comprises a first spoke gear (41) as an input gear and a second spoke gear (42) as an output gear, the first spoke gear (41) and the drive gear (31) meshing, and an incomplete gear mechanism is provided between the first spoke gear (41) and the second spoke gear (42) to enable the second spoke gear (42) to achieve intermittent motion; The rotation adjusting device (5) comprises a main shaft gear (51) as an input gear and a main bevel gear (52) as an output gear, and the main shaft gear (51) meshes with the second spoke gear (42) , between the main shaft gear (51) and the main bevel gear (52) is provided with a speed change mechanism for changing the rotational speed of the main bevel gear (52); The linear adjusting device (6) comprises 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) and the main bevel gear (52) The gears (62) on the second side are connected with the threaded rod (63), and the helical groove of the threaded rod (63) is provided with a sensor sleeve (8) for installing the gas pressure sensor (7). ; The linear adjustment device (6) also includes a circular baffle (64) that is fitted and sealed with the lower plate surface of the pressure-bearing plate (2), the central axis of the circular baffle (64), the bearing The central axis of the pressure plate (2) is consistent with the central axis of the main shaft gear (51), and the area of the circular baffle plate (64) should be able to cover all the air holes (21) on the pressure plate (2). The circular baffle (64) is provided with a notch (641) for accommodating the transverse rail (65), and the upper surface of the transverse rail (65) is flush with the upper surface of the circular baffle (64). There is a sensor inner sleeve (651) for the gas pressure sensor (7) to pass through in the horizontal rail (65) of the s The rail (65) moves linearly in the direction defined by the slot (641). 2. The gas impingement jet pressure measuring device based on an intermittent helical motion mechanism according to claim 1, wherein the intermittent adjustment device (4) comprises a first gear shaft (46) arranged in a vertical direction , a second gear shaft (47) and a third gear shaft (48), the first gear shaft (46) is coaxially provided with a first spoke gear (41) and a first incomplete gear (46) from top to bottom 43), the second gear shaft (47) is coaxially provided with a second incomplete gear (44) and a stepped shaft gear (45) from bottom to top, and the third gear shaft (48) is provided with a first gear shaft (48). Two spoke gears (42), wherein: the first spoke gear (41) meshes with the drive gear (31), and the first incomplete gear (43) cooperates with the second incomplete gear (44) to form an incomplete gear Mechanism, the stepped shaft gear (45) meshes with the second spoke gear (42), and the second spoke gear (42) meshes with the main shaft gear (51). When the gear teeth on the second incomplete gear (44) mesh with each other, the second gear shaft (47) rotates; when the locking arc on the first incomplete gear (43) and the second incomplete gear (44) When the locking arcs on ) are tangent, the second gear shaft (47) stops rotating. 3. The gas impingement jet pressure measuring device based on an intermittent helical motion mechanism according to claim 2, wherein the first gear shaft (46), the second gear shaft (47) and the third gear shaft The bottoms of (48) are respectively fixed with first bases (11) arranged on the bottom plate of the casing (1) through first bearings, and the first bases (11) are L-shaped bent plates. The first gear shaft (46), the third gear shaft (48) and the second gear shaft (47) are respectively arranged at both ends of the first base (11) and at the bends, and the first gear shaft (46) The second gear shaft (47) 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 the shoulders of the stepped shaft. 4. The gas impingement jet pressure measuring device based on an intermittent screw motion mechanism according to claim 1, characterized in that: the rotation adjusting device (5) comprises a main shaft (56) and a side shaft (56) arranged in a vertical direction. 57), the main shaft (56) is located at the center of the bottom plate of the casing (1), and the main shaft (56) is coaxially provided with a main bevel gear (52), a sleeve gear (53) and a main shaft from top to bottom. The gear (51), the main bevel gear (52) and the sleeve gear (53) are respectively fixed on the main shaft sleeve (561), and the main shaft sleeve (561) is connected with the main shaft (56) through the bearing, so 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 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) A speed change mechanism is formed in cooperation with the main shaft gear (51), wherein: the main shaft gear (51) is respectively meshed with the second spoke gear (42) and the first side lower gear (54), and the first side upper gear (55) is meshed with The sleeve gears (53) are meshed with each other, and the main bevel gears (52) are meshed with the side bevel gears (61). 5. The gas impingement jet pressure measuring device based on an intermittent screw motion mechanism according to claim 4, wherein the bottoms of the main shaft (56) and the side shaft (57) pass through the second bearing and the third bearing respectively It is fixed with the second base (12) and the third base (13) arranged on the bottom plate of the casing (1), and the top of the main shaft (56) is provided with a connecting shaft (58) for connecting the linear adjusting device (6). ), the top of the connecting shaft (58) is provided with a sensor guide rail (59) arranged in a horizontal direction, and the connecting shaft (58) is respectively provided with a threaded rod (63) and a main side rod (66) to match The threaded rod hole (581) and the main side rod hole (582), the main shaft (56), the connecting shaft (58) and the sensor guide rail (59) are integrally formed. 6. The gas impingement jet pressure measuring device based on an intermittent screw motion mechanism according to claim 5, wherein the linear adjustment device (6) comprises a threaded rod (63) horizontally arranged in an up-down direction and a main side Rod (66), one end of the threaded rod (63) is connected with an optical axis (631), the threaded rod (63) and the optical axis (631) are integrally structured, and the optical axis (631) vertically penetrates The end of the connecting shaft (58) and the optical axis (631) is provided with a second side upper gear (62); the main side rod (66) vertically penetrates the connecting shaft (58) and the two sides of the main side rod (66) The ends are respectively provided with a second side lower gear (67) and a side bevel gear (61), wherein: the second side upper gear (62) meshes with the second side lower gear (67), and the side bevel gear (61) and the main The bevel gears (52) are meshed. 7. The gas impact jet pressure measuring device based on an intermittent screw motion mechanism according to claim 1, wherein 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) that are sequentially connected from top to bottom as a whole. The sleeve body (81) ) is used to place the gas pressure sensor (7), the sleeve step (82) is used to limit the movement direction of the sensor sleeve (8), and the sleeve tail rod (83) penetrates the sensor guide rail (59) and The end of the sleeve tail rod (83) is located in the helical groove of the threaded rod (63). 8. The gas impingement jet pressure measuring device based on an intermittent helical motion mechanism according to claim 5, characterized in that: the sensor guide rail (59) has a U-shaped section, consisting of a bottom plate (591) and two first A side plate (592) is formed, the bottom plate (591) is provided with a guide rail groove (593) for the sleeve tail rod (83) to pass through, and the inner plate surfaces of the two first side plates (592) T-shaped grooves (594) matched with the sleeve steps (82) are respectively opened upwards from the bottom. 9. The gas impact jet pressure measuring device based on the intermittent spiral motion mechanism according to claim 1, wherein the circular baffle plate (64) is provided with a square notch (64) from the edge to the center. 641), the notch (641) is provided with a transverse rail (65), the upper surface of the transverse rail (65) is flush with the upper surface of the circular baffle (64), and the The lower surface abuts against the upper surface of the sensor guide rail (59), and the transverse rail (65) is provided with a sensor inner sleeve (651) matched with the gas pressure sensor (7). The upper surface is provided with a through hole (652) at a position matching the sensor inner sleeve (651) so that the upper surface of the gas pressure sensor (7) is flush with the upper surface of the horizontal rail (65). The 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 move linearly along the direction defined by the slot (641). . 10. The gas impingement jet pressure measuring device based on an intermittent helical motion mechanism according to claim 1, wherein the transverse rail (65) is a groove body with an inverted U-shaped cross section, including a top plate (653) and two second side plates (654), the upper surface of the top plate (653) is a high and a low stepped surface, wherein: the high stepped surface is flush with the upper surface of the circular baffle (64). , the lower step surface is in contact with the lower plate surface of the circular baffle (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) arranged in a vertical direction, the first baffle plate (68) and the second baffle plate (68) The plates (69) are symmetrically arranged on both sides of the slot (641), and the inner plate surfaces of the first baffle plate (68) and the second baffle plate (69) are respectively connected with the outer plate surfaces of the two second side plates (654). The plate surfaces are in contact with each other, the inner plate surfaces of the first baffle plate (68) and the second baffle plate (69) form a square stepped surface from the bottom upward, and the stepped surface is attached to the top surface and the side surface of the sensor guide rail (59). combined and fixed.

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