CN217058927U - Anti-turbulence inner core of ultrasonic water meter - Google Patents
Anti-turbulence inner core of ultrasonic water meter Download PDFInfo
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- CN217058927U CN217058927U CN202220980715.8U CN202220980715U CN217058927U CN 217058927 U CN217058927 U CN 217058927U CN 202220980715 U CN202220980715 U CN 202220980715U CN 217058927 U CN217058927 U CN 217058927U
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Abstract
The utility model discloses an anti-turbulent flow inner core of an ultrasonic water meter, which comprises a middle section structure, wherein two sides of the middle section structure are respectively provided with a reflecting surface structure, and the outer side of the reflecting surface structure is also provided with a fixed head structure; the middle section structure comprises a middle pipe, a rib plate and a positioning hole, wherein a sealing groove is formed in the middle pipe, and a sealing ring is arranged in the sealing groove; the reflecting surface structure comprises a reflecting cylinder and a reflecting sheet; the fixed head structure comprises a fixed cylinder connected with the reflecting cylinder, and a flow guide column is arranged in the fixed cylinder. The beneficial effects of the utility model are that: the flow guide column can play a role in reducing pressure loss and improving the anti-turbulent flow performance, and the installation requirement of U0D0 is met; and no installation gap exists in the flow channel, so that the consistency of products can be ensured. Sealing rings are arranged on the middle pipe and on the outer side of the rib plate, so that no internal leakage is generated during assembly; meanwhile, the inner core is simple in structure and convenient to manufacture, and production and assembly efficiency can be effectively improved.
Description
Technical Field
The utility model relates to an ultrasonic water meter device field, especially an ultrasonic water meter anti-interference flows inner core.
Background
In the field of ultrasonic water meters, the arrangement modes of transducers of the ultrasonic water meter are divided into a U type, a V type, a W type and the like according to different measurement principles, wherein the U type arrangement mode is most widely applied. The U-shaped arrangement mode needs to install a pair of reflectors in the center of the water meter, but the turbulence effect of the structure is obvious, the inner core has no rectification structure, and the pressure loss is large.
In the ultrasonic water meter on the current market, the effective area of the reflector plate is small, the coverage rate of the necking pipe is low, and all flow rate information in the necking pipe cannot be loaded. And installation accessories are many, and the assembly is loaded down with trivial details, easily receives frock precision and human factor to influence, and the uniformity is relatively poor. The inner core of the bracket type water meter is mostly of a two-half structure, and is buckled with an installation gap which is generated, so that internal leakage is easy to occur.
During assembly, interference fit between the metal support and the pipe section of the inserted sheet type water meter needs to be installed in place at one time, and the reject ratio is high. Therefore, although the measurement precision can be improved by increasing the area of the reflector plate, the flow field sensitivity adaptability is stronger, the requirements on the front and rear straight pipe sections are reduced, the signal reception is more stable, but the pressure loss exceeds the standard seriously.
SUMMERY OF THE UTILITY MODEL
Based on the problem, the utility model provides an ultrasonic water meter anti-turbulence inner core installs the water conservancy diversion post behind traditional reflector plate, improves measurement accuracy, increases water meter anti-turbulence ability to make the pressure loss reduce.
The utility model discloses a realize that the technical scheme who takes of its technical purpose is:
an anti-interference flow inner core of an ultrasonic water meter comprises a middle section structure, wherein two sides of the middle section structure are respectively provided with a reflecting surface structure, and the outer side of the reflecting surface structure is also provided with a fixed head structure;
the middle section structure comprises a middle pipe, a rib plate is arranged on the outer wall of the middle pipe, a positioning hole is further formed in the upper surface of the middle pipe, a sealing groove is formed in the middle pipe and the outer side of the rib plate, and a sealing ring is arranged in the sealing groove;
the reflecting surface structure comprises a reflecting cylinder connected to the middle pipe and the outer side of the sealing groove, an opening is formed in the wall of the reflecting cylinder, a reflecting sheet is arranged in the reflecting cylinder, and the reflecting sheet is connected with the inner wall of the reflecting cylinder through a reflecting frame;
the fixed head structure comprises a fixed cylinder connected with the reflecting cylinder, a flow guide column is arranged in the fixed cylinder, one end of the flow guide column is connected to the reflecting frame, and the other end of the flow guide column extends towards the outer end face of the fixed cylinder.
Preferably, the reflection frame comprises a supporting block and a connecting block, the supporting block is arranged in the center of the middle pipe and is connected to the inner wall of the reflection cylinder through the connecting block, one end of the supporting block is connected with the flow guide column, and the other end of the supporting block is provided with an insertion groove; the back side of the reflector plate is connected with a plug-in post which is plugged with the plug-in groove.
Preferably, the inserting column comprises an inserting part and an inclined part, the inserting part is matched with the inserting groove in shape, the inclined part is of a cylindrical structure with an inclined plane, the bottom surface of the cylinder is connected with the inserting part, and the inclined plane is connected with the reflecting sheet.
Preferably, the inner part of the middle tube is a reducing tube, and the inner diameter of the reducing tube is smaller than that of the reflecting cylinder.
Preferably, the connection part of the reducing pipe and the inner diameter of the reflecting cylinder adopts circular arc transition.
Preferably, the outer end of the guide pillar extends to the outer end face of the fixed cylinder, and the outer end of the guide pillar is a smooth curved surface or a conical surface.
Preferably, the outer end of the flow guide column is a hemisphere, a semi-ellipsoid or a cone.
Preferably, the positioning hole is a blind hole.
The utility model has the advantages that: the flow guide column can play a role in reducing pressure loss and improving the anti-interference performance, and the installation requirement of U0D0 is met; and no installation gap exists in the flow channel, so that the consistency of products can be ensured. Sealing rings are arranged on the middle pipe and on the outer side of the rib plate, so that no internal leakage is generated during assembly; meanwhile, the inner core is simple in structure and convenient to manufacture, and production and assembly efficiency can be effectively improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the anti-turbulent flow inner core of the present invention;
FIG. 2 is a perspective view of the reflecting surface structure of the present invention in a separated state;
FIG. 3 is a front view of the assembled state of the present invention;
FIG. 4 is a top view of the assembled state of the present invention;
FIG. 5 is a front sectional view of the assembled state of the present invention;
FIG. 6 is a left side view of FIG. 3;
FIG. 7 is a schematic structural view of the present invention after being assembled with a pipe section;
FIG. 8 is a schematic view of the measurement principle of the present invention;
FIG. 9 is a schematic view of a valveless anti-turbulent flow core flow velocity contour;
FIG. 10 is a schematic view of a flow velocity contour line for a valved anti-turbulent flow core;
FIG. 11 is a schematic view of a flow velocity contour line of an inner core of a valveless conventional water meter;
FIG. 12 is a flow velocity contour line of an inner core of a common water meter with a valve;
FIG. 13 is a line graph illustrating data analysis of the influence of different guide post diameters on pressure loss and valve turbulence error;
FIG. 14 is a graph showing comparative curves of measurement errors caused by pressure loss and valve turbulence in two core simulations and experiments;
figure 15 is a table comparing pressure loss versus valve effect error data for different water meters.
Labeled in the figure as:
1. a middle section structure; 2. a reflective surface structure; 3. a fixed head structure; 11. an intermediate pipe; 12. a rib plate;
13. positioning holes; 14. a sealing groove; 21. a reflecting cylinder; 22. an opening; 23. a reflective sheet; 24. a reflection frame; 241. a support block; 242. connecting blocks; 243. inserting grooves; 244. inserting the column; 2441. a plug-in part; 2442. an inclined portion; 31. a fixed cylinder; 32. a flow guide column.
Detailed Description
The present invention will be further explained with reference to the embodiments of the drawings.
Example one
As shown in fig. 1-7:
an anti-interference flow inner core of an ultrasonic water meter comprises a middle section structure 1, wherein two sides of the middle section structure 1 are respectively provided with a reflecting surface structure 2, and the outer side of the reflecting surface structure 2 is also provided with a fixed head structure 3;
the middle section structure 1 comprises a middle pipe 11, a rib plate 12 is arranged on the outer wall of the middle pipe 11, a positioning hole 13 is further arranged on the upper surface of the middle pipe 11, and the positioning hole 13 is a blind hole, so that the position of an anti-turbulent flow inner core in a water pipe section can be conveniently fixed; a sealing groove 14 is formed in the middle pipe 11 and outside the rib plate 12, and a sealing ring is arranged in the sealing groove 14 and used for preventing internal leakage.
The reflecting surface structure 2 comprises a reflecting cylinder 21 connected to the middle pipe 11 and outside the sealing groove 14, an opening 22 is formed in the cylinder wall of the reflecting cylinder 21, a reflecting sheet 23 is arranged inside the reflecting cylinder 21, and the reflecting sheet 23 is connected with the inner wall of the reflecting cylinder 21 through a reflecting frame 24;
the fixing head structure 3 includes a fixing cylinder 31 connected to the reflecting cylinder 21, a flow guiding column 32 is provided in the fixing cylinder 31, one end of the flow guiding column 32 is connected to the reflecting frame 24, and the other end extends to the outer end face of the fixing cylinder 31.
The reflection frame 24 comprises a supporting block 241 and a connecting block 242, the supporting block 241 is arranged in the center of the middle pipe 11 and is connected to the inner wall of the reflection cylinder 21 through the connecting block 242, one end of the supporting block 241 is connected with the flow guiding column 32, and the other end of the supporting block 241 is provided with an inserting groove 243; the rear side of the reflection sheet 23 is connected with a plug-in post 244, and the plug-in post 244 is plugged in the plug-in groove 243.
The inserting column 244 includes an inserting portion 2441 and an inclined portion 2442, the inserting portion 2441 is matched with the inserting groove 243 in shape, the inclined portion 2442 is a cylindrical structure with an inclined surface, the cylindrical bottom surface of the inclined portion is connected with the inserting portion 2441, and the inclined surface of the inclined portion is connected with the reflecting sheet 23.
The middle tube 11 is internally provided with a necking tube, the inner diameter of the necking tube is smaller than that of the reflecting cylinder 21, and the middle tube 11 is internally provided with the necking tube and used for increasing the flow velocity and increasing the sound path so as to obtain larger flight time difference; the connection part of the reducing pipe 11 and the inner diameter of the reflecting cylinder 21 adopts arc 4 transition to reduce the generation of vortex; the fixed head is equipped with the guide post, and the outer end of guide post 32 extends to the outer terminal surface department of solid fixed cylinder 31 to guide post 32 outer end is slick and sly curved surface or conical surface, preferred hemisphere, semiellipsoid or cone, can play the rectification effect to the incoming flow, and can reduce the pressure loss, and guide post 32 is fixed by the support, and the support setting is prevented not installing structure, and the support of this department is different with other support sizes, effectively prevents to appear the maloperation in the production process.
The middle tube 11 and the fixing head structure 3 are completed by adopting an injection molding process, the reflecting surface structure is completed by using a machining process, the reflecting surface structure is made of a stainless steel metal material, the smoothness of the reflecting surface is ensured, the fixing head can be combined by using an insert injection molding process, a hot melting process or a bonding process, and the middle section 11 and the fixing cylinders 31 on the two sides can be fixed by adopting hot melting, bonding or ultrasonic welding, laser welding and other processes.
Ultrasonic water meter anti-interference inner core, its application method include following step: step one, data acquisition and calculation:
an opening is arranged on the wall of the reflecting cylinder, and an ultrasonic transducer is arranged at the opening, as shown in fig. 8: from the data acquired at the transducer, the calculation is made as follows:
in the formula:
tup-the upstream propagation time of the ultrasonic wave in the fluid,
tdown-the downstream transit time of an ultrasonic wave in a fluid,
y-the length of the channel in the horizontal direction,
x-the length of the sound channel in the vertical direction,
Δ t-the time difference of flight,
v m -the average velocity in the axial direction of the fluid,
c f -the speed of propagation of the acoustic wave in the fluid,
the water flow speed v is obtained through the conversion of the flight time difference received by the ultrasonic transducer m So as to realize accurate measurement of the water meter.
Step two, flow velocity and pressure loss measurement:
the traditional reflector plate is in a thin plate shape, when flowing through the reflector plate, the direction and the speed of water flow are suddenly changed, the local water quality point and the solid wall surface are collided with each other and generate violent friction, the rotation of the longitudinal vortex omega also plays a role in blocking the water flow in the horizontal direction, and according to the law of conservation of energy, the flow resistance needs to be overcome at the expense of pressure loss, so that larger pressure loss is caused; secondly, the area of the traditional reflector plate is small, the signal intensity is weak, and the coverage rate of the traditional reflector plate on the necking pipe is low.
The anti-turbulence inner core reflecting surface is provided with the flow guide column with the curved surface structure behind, so that the water flow direction can be slowly changed, the influence on main flow is small, the pressure loss is reduced, in addition, the anti-turbulence inner core reflecting sheet is large, the signal receiving intensity and the coverage rate alpha to the necking pipe are higher, and the metering is more accurate.
The metering process is as follows:
ΔP＝P-P 0
in the formula:
p-pressure value at 20cm position in front of pipe section
P 0 Pressure value at 20cm behind the pipe section
S reflector plate-reflector plate area
S-neck reducing pipe cross-section area
The numerical calculation part adopts the following time-average control equation:
continuity equation:
the momentum equation:
equation of turbulent kinetic energy:
turbulent dissipation ratio equation:
constant coefficient C introduced by the above equation 1 、C 2 And sigma κ 、σ ε The values of (A) are: c 1 ＝1.44，C 2 ＝1.92，σ κ ＝1.0，σ ε ＝1.3。
The size of the reducing pipe 11 is restricted as follows:
the length of the necking pipe 11 is at least larger than one time of the inner diameter of the pipe section, the size of the necking is determined according to the required pressure loss, the included angle between the reflecting surface of the flow guide column and the horizontal plane is 45 degrees, and the length of the short axis and the length of the long axis/1.414 are not larger than the inner diameter of the necking pipe. The length of the fixed steady flow column should be less than twice the internal diameter of the pipe section.
The experiment and simulation process comprises the following steps:
in order to verify the performance of the inner core, a valve turbulence test and a pressure loss test are carried out on the inner core, and the closing angle of the ball valve is 30 degrees when the inner core is tested, and the ball valve is arranged in front of a pipe section, as shown in figures 9-15: for the comparative analysis result of simulation and experimental data related to the anti-interference flow inner core and the common water meter inner core, the metering error Evalue caused by the interference flow of the valve is defined as follows, and the pressure loss of the anti-interference flow inner core and the metering influence of the valve are reduced by more than 20% compared with the common water meter pipe section with the same inner diameter necking pipe.
Where uvalue is the measured flow when the valve is installed and u is the measured flow without the valve.
Through the analysis of the influence of different guide columns on the pressure loss and the valve turbulent flow error, the result shows that when the diameter of each guide column is 10mm, the comprehensive evaluation of the anti-turbulent flow inner core is the best, the pressure loss is lower, and the metering precision is high.
The utility model has the advantages that:
1. the flow guide column 32 is arranged in front of the reflecting surface structure 2, so that the pressure loss can be reduced, the metering precision is improved, and the requirement of U0D0 flow field sensitivity grade is met.
2. Sectional type equipment does not have horizontal gap, does not have drawbacks such as the installation is loaded down with trivial details, can guarantee that the ultrasonic water meter uniformity after the equipment is good.
3. The mode of the transition connection between the neck pipe 11 and the two sides is changed from step transition connection to circular arc transition connection, so that the fluid instability of the measuring section is reduced, and the connection mode of the reflecting surface structure 2 and the guide column 32 is not limited to a clamping mode or a welding mode.
4. The number of the supports of the guiding column 32, i.e. the connecting blocks 242, is not limited to 3, and is not limited to any shape, and is not limited to any mounting position, so that the structure can be used for different household water meter pipe sections, different caliber water meter pipe sections, different heat meter pipe sections, and the like.
5. The inner core is simple in structure and convenient to manufacture, and production and assembly efficiency can be effectively improved.
Claims (8)
1. An anti-interference flow inner core of an ultrasonic water meter comprises a middle section structure, wherein two sides of the middle section structure are respectively provided with a reflecting surface structure, and the outer side of the reflecting surface structure is also provided with a fixed head structure; the method is characterized in that:
the middle section structure comprises a middle pipe, a rib plate is arranged on the outer wall of the middle pipe, a positioning hole is further formed in the upper surface of the middle pipe, a sealing groove is formed in the middle pipe and the outer side of the rib plate, and a sealing ring is arranged in the sealing groove;
the reflecting surface structure comprises a reflecting cylinder connected to the middle pipe and outside the sealing groove, an opening is formed in the wall of the reflecting cylinder, a reflecting sheet is arranged in the reflecting cylinder, and the reflecting sheet is connected with the inner wall of the reflecting cylinder through a reflecting frame;
the fixed head structure comprises a fixed cylinder connected with the reflecting cylinder, a flow guide column is arranged in the fixed cylinder, one end of the flow guide column is connected to the reflecting frame, and the other end of the flow guide column extends to the outer end face of the fixed cylinder.
2. The ultrasonic water meter anti-turbulent flow inner core of claim 1, wherein: the reflecting frame comprises a supporting block and a connecting block, the supporting block is arranged in the center of the middle pipe and is connected to the inner wall of the reflecting cylinder through the connecting block, one end of the supporting block is connected with the flow guiding column, and the other end of the supporting block is provided with an inserting groove; the back side of the reflector plate is connected with an inserting column, and the inserting column is inserted into the inserting groove.
3. The ultrasonic water meter anti-turbulence inner core of claim 2, wherein: the inserting column comprises an inserting part and an inclined part, the inserting part is matched with the inserting groove in shape, the inclined part is of a cylindrical structure with an inclined plane, the bottom surface of the cylinder is connected with the inserting part, and the inclined plane is connected with the reflecting sheet.
4. The ultrasonic water meter anti-turbulence inner core of claim 2, wherein: the inner part of the middle tube is a reducing tube, and the inner diameter of the reducing tube is smaller than that of the reflecting tube.
5. The ultrasonic water meter anti-turbulent flow inner core of claim 4, wherein: and the joint of the reducing pipe and the inner diameter of the reflecting cylinder adopts circular arc transition.
6. The ultrasonic water meter anti-turbulent flow inner core of claim 1, wherein: the outer end of the flow guide column extends towards the outer end face of the fixed cylinder, and the outer end of the flow guide column is a smooth curved surface or a conical surface.
7. The ultrasonic water meter anti-turbulence inner core of claim 6, wherein: the outer end of the flow guide column is a hemisphere, a semi-ellipsoid or a cone.
8. The ultrasonic water meter anti-turbulent flow inner core of claim 1, wherein: the positioning holes are blind holes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220980715.8U CN217058927U (en) | 2022-04-26 | 2022-04-26 | Anti-turbulence inner core of ultrasonic water meter |
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| CN202220980715.8U CN217058927U (en) | 2022-04-26 | 2022-04-26 | Anti-turbulence inner core of ultrasonic water meter |
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