Mixed flow type temperature, pressure sampler
Technical field
The invention belongs to the handpiece Water Chilling Units technical field of measurement and test, be specifically related to a kind of mixed flow type temperature, pressure sampler.
Background technology
In recent years; Continuous improvement along with people's living standard; The handpiece Water Chilling Units of Air-conditioning Enterprise made both domestic and external also demonstrates the increasing trend of refrigerating capacity; There has been at present producer to produce the centrifugal refrigerating machines that nominal cold surpasses 7000kw, so large-scale handpiece Water Chilling Units proving installation also had higher requirement.The flow span of a common cover handpiece Water Chilling Units proving installation is 4~5 times, when doing the low discharge test, because velocity in pipes is lower, so the thermal stratification phenomenon will be very serious, thereby has influenced final test result.
Summary of the invention
The purpose of this invention is to provide a kind of mixed flow type temperature, pressure sampler; This device can satisfy the testing requirement of the system of big flow span; And can both make fluid carry out sufficient mixed flow under the big traffic conditions with under the low discharge situation, thereby guarantee the test result of device.
For realizing above-mentioned purpose; The present invention has adopted following technical scheme: a kind of mixed flow type temperature, pressure sampler; This sampler comprises the sampling section that the temperature and pressure that is used for convection cell detects, and the front side of the longshore current body flow direction of said sampling section is provided with the mixed flow section that convection cell carries out abundant mixed flow.
This mixed flow type temperature, pressure sampler can also be able to further realization in the following manner:
Said mixed flow section comprises first delivery pipe that supplies fluid to pass through, and the inside of first delivery pipe is provided with reference column; Be provided with the mixed flow blade that is connected the two and the fluid in first delivery pipe carried out abundant mixed flow between reference column and first delivery pipe.
The axis of the said reference column and first delivery pipe is parallel to each other; Said mixed flow blade is provided with a plurality of, and a plurality of mixed flow blade circumferentially being laid in equably between the reference column and first delivery pipe along reference column; Said mixed flow blade is provided with and is used for mixed flow and pod apertures that run through the mixed flow blade body.
Said mixed flow blade is fan-shaped and is tabular that the angle between the plate face of mixed flow blade and the axis of first delivery pipe is 25~45 °; Said pod apertures is a circular hole, and pod apertures is along offering perpendicular to the plate face of mixed flow blade.
The aperture of said pod apertures is 6~10mm, and the perforated area sum of the pod apertures on any mixed flow blade therewith the ratio of the plate face area of mixed flow blade be 20~35%.
Said sampling section comprises second delivery pipe that links to each other with first delivery pipe, is disposed with pressure samples hole and temperature drive pipe near first delivery pipe, one side direction away from first delivery pipe, one side certainly on the body of said second delivery pipe; The end away from first delivery pipe of said second delivery pipe is provided with and tests the supporting flange that unit links to each other.
The material of said first delivery pipe and second delivery pipe identical and the two weld together.
Said pressure samples hole along second delivery pipe circumferentially equably cloth be made as 3.
Said temperature drive pipe is a copper tube, and the ratio that the temperature drive pipe stretches into pipe range and the internal diameter of second delivery pipe in second delivery pipe is 1/2nd to 2/3rds.
The end that links to each other with first delivery pipe of said second delivery pipe and the distance of the edge second delivery pipe axis direction between the pressure samples hole are first spacing, and the distance of the edge second delivery pipe axis direction between pressure samples hole and the temperature drive pipe is second spacing; The caliber of said second delivery pipe is DN100~DN300, and the length of said first spacing and second spacing is 300~650mm.
The present invention compares with prior art has following beneficial effect:
1), the present invention can satisfy the test request of the system of big flow span, the present invention simultaneously can both make fluid carry out sufficient mixed flow under the big traffic conditions with under the low discharge situation.
2), the present invention is easy for installation; As long as two corresponding welding end surface of first delivery pipe and second delivery pipe are welded, first delivery pipe that will weld together then and second delivery pipe are directly connected in the pipeline on the test macro through the supporting flange on second delivery pipe and just can use.
3), the present invention's mode of adopting fan-shaped stator to combine with pod apertures, can guarantee the effect of mixed flow to greatest extent, guarantee the measurement accuracy at temperature point place and pressure-measuring-point place.
4), the pressure samples among the present invention adopts the mode of annular static pressure measurement, the static pressure that guarantees to measure tube wall is a mean value, thereby has further guaranteed the accuracy of measuring.
Description of drawings
Fig. 1 is the structural representation of mixed flow section among the present invention;
Fig. 2 is the structural representation of sampling section among the present invention;
Fig. 3 is the right view of Fig. 2.
The implication of mark is following among the figure:
10-mixed flow section, 11-the first delivery pipe, 12-reference column, 13-mixed flow blade
The welding end surface 20 of 14-pod apertures, 15-the first delivery pipe-sampling section
21-the second delivery pipe, 22-pressure samples hole, 23-temperature drive pipe
The welding end surface 25 of 24-the second delivery pipe-supporting flange.
Embodiment
Like Fig. 1, shown in 2; A kind of mixed flow type temperature, pressure sampler; This sampler comprises the sampling section 20 that the temperature and pressure that is used for convection cell detects, and the front side of the longshore current body flow direction of said sampling section 20 is provided with the mixed flow section 10 that convection cell carries out abundant mixed flow.
As shown in Figure 1, said mixed flow section 10 comprises that the inside of first delivery pipe, 11, the first delivery pipes 11 that the confession fluid passes through is provided with reference column 12; Be provided with the mixed flow blade 13 that is connected the two and the fluid in first delivery pipe 11 carried out abundant mixed flow between reference column 12 and first delivery pipe 11.
Described mixed flow section 10 can be set to one or each other the serial connection a plurality of.
Preferably, the axis of the said reference column 12 and first delivery pipe 11 is parallel to each other; Said mixed flow blade 13 is provided with a plurality of, and a plurality of mixed flow blade 13 circumferentially being laid in equably between the reference column 12 and first delivery pipe 11 along reference column 12; Said mixed flow blade 13 is provided with and is used for mixed flow and pod apertures 14 that run through mixed flow blade 13 bodies.
Further, as shown in Figure 1, said mixed flow blade 13 is fan-shaped and is tabular that the angle between the plate face of mixed flow blade 13 and the axis of first delivery pipe 11 is 25~45 °; Said pod apertures 14 is a circular hole, and pod apertures 14 is along offering perpendicular to the plate face of mixed flow blade 13.
Further; The aperture of said pod apertures 14 is 6~10mm; And the perforated area sum of the pod apertures 14 on any mixed flow blade 13 ratio of the plate face area of mixed flow blade 13 therewith is 20~35%, also is that the percentage of perforation of the pod apertures 14 on any mixed flow blade 13 plate face is 20~35%.
As shown in Figure 2; Said sampling section 20 comprises second delivery pipe 21 that links to each other with first delivery pipe 11, is disposed with pressure samples hole 22 and temperature drive pipe 23 near first delivery pipe, 11 1 side direction away from first delivery pipe, 11 1 sides certainly on the body of said second delivery pipe 21; The end away from first delivery pipe 11 of said second delivery pipe 21 is provided with and tests the supporting flange 25 that unit links to each other.
The material of said first delivery pipe 11 and second delivery pipe 21 identical and the two weld together.
As shown in Figure 3, said pressure samples hole 22 along second delivery pipe 21 circumferentially equably cloth be made as 3.
Preferably, said temperature drive pipe 23 is a copper tube, and the ratio that temperature drive pipe 23 stretches into pipe range H and the inside diameter D of second delivery pipe 21 in second delivery pipe 21 is 1/2nd to 2/3rds.
Further; The distance of the end that links to each other with first delivery pipe 11 of said second delivery pipe 21 and second delivery pipe, 21 axis directions of the edge between the pressure samples hole 22 is the first spacing L1, and the distance of edge second delivery pipe, 21 axis directions between pressure samples hole 22 and the temperature drive pipe 23 is the second spacing L2; The caliber of said second delivery pipe 21 is DN100~DN300, and the length of the said first spacing L1 and the second spacing L2 is 300~650mm.
Couple the present invention does further explanation below in conjunction with Fig. 1~3:
Like Fig. 1, shown in 2; First delivery pipe 11 and second delivery pipe 21 are different according to physical properties of fluids of carrying and temperature; Can adopt tubing such as welded still pipe, weldless steel tube or stainless-steel tube, but first delivery pipe 11 and second delivery pipe 21 must be taked material of the same race.
The refluence angle of fan-shaped mixed flow blade 13 also is that the angle between the axis of plate face and first delivery pipe 11 of mixed flow blade 13 need calculate according to the lower limit flow velocity of fluid; To guarantee that fluid reaches disturbed flow condition at pressure-measuring-point and temperature point place; When if fluid is water, the axis of the mixed flow blade 13 and first delivery pipe 11 also is that the angle of caliber center line is 25~45 °.
The aperture of pod apertures 14 and the size of percentage of perforation are relevant with rate of flow of fluid and viscosity, and when fluid was water, Φ 6mm~Φ 10mm was generally adopted in the aperture, and percentage of perforation is 20~35%.
Pressure samples hole 22 adopts internal thread to connect, and the present invention adopts ring-type static pressure measurement method, promptly on second delivery pipe 21, offers three pressure samples holes 22, and makes the angle between the Kong Yukong be 120 degree, and is as shown in Figure 3.Ring-type static pressure measurement method can guarantee the accuracy of static pressure measurement, and the flexible pipe through Φ 6 is connected to and carries out pressure survey on the pressure transducer then.
Temperature drive pipe 23 adopts the copper tube of 1.2mm to make; The pipe range H that stretches in second delivery pipe 21 will guarantee 1/2~2/3 place in the inside diameter D of second delivery pipe 21; As shown in Figure 2, guaranteeing fully contacting of temperature drive pipe 23 and fluid, and then guarantee the accuracy of measurement.
Supporting flange 25 is used for this device is connected to the test unit, and as long as the specification of supporting flange 25 is identical with the specification of test machine group interface.
When this mixed flow type temperature, pressure sampler uses; The welding end surface 15 of first delivery pipe 11 and the welding end surface 24 of second delivery pipe 21 are welded; And first delivery pipe 11 that will weld together and second delivery pipe 21 be installed on the water system of handpiece Water Chilling Units proving installation through supporting flange 25, guarantee flow direction will be earlier through after the mixed flow section 10 again through the temperature, pressure measuring point on the sampling section 20.
As shown in Figure 2, when rate of flow of fluid is low, need to calculate the bee-line of the first spacing L1 and the second spacing L2, even with the fluid mixed flow that guarantees temperature, pressure measuring point place.Generalized case; If fluid is a water; When the caliber of first delivery pipe 11 and second delivery pipe 21 was DN100~DN300, the length of the first spacing L1 and the second spacing L2 was 300~650mm, and the length of the said first spacing L1 and the second spacing L2 can be got equal values or different value.
As shown in Figure 3, when fluid during through fan-shaped mixed flow blade 13, the angle of mixed flow blade 13 can make fluid produce rotation, thereby the fluids in first delivery pipe 11 are fully mixed, and has broken the original thermal stratification of fluid.Pod apertures 14 on the said mixed flow blade 13 mainly contains two effects, and the first reduces the resistance of mixed flow section 10, and it two is can produce jet when fluid during through pod apertures 14, thereby also can reach the purpose that fluid is mixed.Through the mixed flow effect of mixed flow section 10, when fluid arrives the temperature, pressure measuring point, can guarantee fluid through mixing fully, and then guarantee that the section temperature of fluid does not have layering, guaranteed the accuracy that temperature, pressure is measured.