CN106337828A - Portable draught fan testing device and method - Google Patents

Abstract

The invention relates to the field of draught fan testing and aims to provide a portable draught fan testing device and method. The portable draught fan testing device comprises a draught fan and further comprises an air inflow vortex breaking device, a measuring device and an airflow rectifying device, wherein the rear end of the measuring device is detachably connected with an air inlet of the draught fan; and the airflow rectifying device is connected with the rear end of the air inflow vortex breaking device and the front end of the measuring device. The air inflow vortex breaking device comprises a vortex breaking pipe of which the front end is larger than the rear end, a conical vortex breaking head of which the small end is located on the front side and a plurality of fixed rods which are arranged in a crossed mode and connected with the rear end of the conical vortex breaking head; the conical vortex breaking head is located in the vortex breaking pipe; and the two ends of each fixed rod are connected with the inner side of the vortex breaking pipe. The portable draught fan testing device is high in draught fan testing efficiency and precision.

Description

Portable wind apparatus test device and method of testing

Technical field

The present invention relates to fan test field, especially a kind of Portable wind apparatus test device and method of testing.

Background technology

Blower fan is widely used, according to using need it is often necessary to design the blower fan of size and unique properties；New blower fan sets Timing needs are repeatedly carried out performance test on testing stand and are carried out optimization design；Draught fan performance test is carried out on testing stand deposit Fan test is less efficient and intake swirl impact makes the relatively low deficiency of measuring accuracy, therefore, design a kind of fan test effect Rate is higher and the higher Portable wind apparatus test device of measuring accuracy and method of testing, becomes problem demanding prompt solution.

Content of the invention

The invention aims to overcoming, carrying out draught fan performance test on testing stand has fan test efficiency at present Relatively low and intake swirl impact makes the relatively low deficiency of measuring accuracy, provides a kind of fan test efficiency higher and measuring accuracy is higher Portable wind apparatus test device and method of testing.

The concrete technical scheme of the present invention is:

A kind of Portable wind apparatus test device, comprising: blower fan；Described Portable wind apparatus test device also includes: whirlpool is broken in air inlet Device, the measurement apparatus that rear end and air inlet are detachably connected；Connect with broken whirlpool device rear end and measurement apparatus front end respectively The airflow commutating device connecing；Air inlet is broken whirlpool device and is included: front end is more than the broken scroll of rear end, and small end is located at the tapered broken whirlpool of front side Head, several fix bars that are arranged in a crossed manner and being connected with tapered broken whirlpool head rear end；Tapered broken whirlpool head is located in broken scroll；Fix bar Two ends be connected with the inner side of broken scroll respectively.When Portable wind apparatus test device uses, measurement apparatus are with air inlet even Connect and do not need to move blower fan, the tapered broken whirlpool head of whirlpool device is broken in air inlet and front end can effectively eliminate more than the broken scroll cooperation of rear end Intake swirl；This Portable wind apparatus test device fan test efficiency is higher and measuring accuracy is higher.

Preferably, described measurement apparatus include: outer gusset is provided with stud and rear end is detachably connected with air inlet The testing tube connecing, located at stud end face and with testing tube inside insertion conical through-hole；It is provided with the survey being arranged in conical through-hole Bar and be located in testing tube and the Pitot tube of measuring head that rear end is connected with reference test bar, sealing ring, clamp nut；Conical through-hole Small end be located at testing tube inside；Sealing ring is provided with outer cone section and the inner cone section mated with conical through-hole, clamp nut be provided with The cone shaped countersink of outer cone section coupling；Clamp nut is threadeded with stud and cone shaped countersink pushes down outer cone section.The skin of measurement apparatus Trustship is to measure air-flow stagnation pressure and static pressure to determine a kind of tube of air velocity, can effectively measure air-flow stagnation pressure and static pressure And high precision；Sealing ring is provided with outer cone section and the inner cone section mated with conical through-hole, and clamp nut is provided with and is mated with outer cone section Cone shaped countersink, clamp nut is threadeded with stud and cone shaped countersink pushes down outer cone section, tightly pushes down survey after making sealed ring deformation The outer gusset of bar and conical through-hole, improve sealing.

Preferably, described airflow commutating device includes: the rectifying tube that front end is connected with broken scroll rear end, located at rectification Several risers in pipe and several transverse slats arranged in a crossed manner with riser；Rectifying tube is separated into several points by riser and transverse slat Not and the insertion of rectifying tube front-end and back-end gas channel；The rear end of rectifying tube is connected with the front end of testing tube.Air-flow rectification fills Put simple and practical；Several gas channels make gas flow uniform, improve test accuracy.

Preferably, the shape of cross section of described broken scroll is rectangle；The shape of cross section of testing tube is rectangle；Rectification The shape of cross section of pipe is rectangle.Beneficial to fabrication and installation and consistent beneficial to several gas channel size shape.

Preferably, whirlpool device is broken in described air inlet also including: outside the head of tapered broken whirlpool and small end is located at front side Taper type breaks whirlpool sleeve pipe；The big end that taper type breaks whirlpool sleeve pipe is connected with fix bar；The internal diameter that taper type breaks whirlpool sleeve pipe small end is more than Taper type breaks the external diameter at the big end of whirlpool sleeve pipe.Outside the head of tapered broken whirlpool and the internal diameter of small end is more than taper type and breaks the big end of whirlpool sleeve pipe The taper type of external diameter break whirlpool sleeve pipe, make elimination intake swirl effect more preferable.

A kind of method of testing of Portable wind apparatus test device, step one, calculate inlet -duct area a1, a1 area specifies Cross-sectional area for rectifying tube rear end；Calculate discharge area a2, a2 area is defined as the cross section at air inlet Area；Step 2, test environment atmospheric pressure pba and environment temperature θ_a(℃)；Step 3, opens blower fan, and Pitot tube measures total Pressure p1t, static pressure p1s (negative pressure), pressure reduction p1d；Step 4, calculates atmospheric density ρ under experimental enviroment by formula_a:Step 5, by formula calculating air quantity qv:Step Six, total head pft is calculated by formula: obtained by pft=p2t-p1t=p2d+p2s- (p1d+p1s), because p2s=0, pft =p2d-p1t；

$\begin{array}{c}{p}_{2d}=\frac{{\mathrm{\ρ}}_a\×v_2^2}{2}=\frac{{\mathrm{\ρ}}_a\×{\left(\frac{a_1\×v_1}{a_2}\right)}^2}{2}\\ =\frac{{\mathrm{\ρ}}_a\×{\left(\frac{a_1\×\sqrt{\frac{2p_{1d}}{{\mathrm{\ρ}}_a}}}{a_2}\right)}^2}{2}={\left(\frac{a_1}{a_2}\right)}^2\×p_{1d}\end{array}$

So:

Step 7, by formula calculated static pressure pfs:pfs=pft-pfd=p2s- (p1d+p1s), because p2s=0, therefore: pfs =-p1t；

Step 8, is calculated by formula and marks condition total head pbft:

$p_{bft}=\frac{{\mathrm{\ρ}}_n}{{\mathrm{\ρ}}_a}\×p_{ft}$

ρ in formula_n=1.20518kg/m3；

Step 9, calculates mark condition total pressure efficiency η by formula_b:

${\mathrm{\η}}_b\left(\%\right)=\frac{q_v\×p_{bft}}{p}\×100;$

Step 10, is calculated by formula and marks condition static pressure pbfs:

ρ in formula_n=1.20518kg/m3.

The method of testing of Portable wind apparatus test device can meet fan test needs and convenience of calculation.

Compared with prior art, the invention has the beneficial effects as follows: this Portable wind apparatus test device fan test efficiency is relatively High and measuring accuracy is higher.The Pitot tube of measurement apparatus is to measure air-flow stagnation pressure and static pressure to determine a kind of tubulose of air velocity Device, can effectively measure air-flow stagnation pressure and static pressure and high precision；Sealing ring is provided with outer cone section and the inner cone mating with conical through-hole Section, clamp nut is provided with the cone shaped countersink mating with outer cone section, and clamp nut is threadeded with stud and cone shaped countersink is pushed down outward Cone section, tightly pushes down the outer gusset of reference test bar and conical through-hole, improves sealing after making sealed ring deformation.Airflow commutating device structure Simple and practical；Several gas channels make gas flow uniform, improve test accuracy.Broken scroll, testing tube and rectifying tube Shape of cross section is rectangle, beneficial to fabrication and installation and consistent beneficial to several gas channel size shape.Positioned at tapered broken whirlpool The taper type that the internal diameter of head outside and small end is more than the external diameter that taper type breaks the big end of whirlpool sleeve pipe breaks whirlpool sleeve pipe, makes elimination intake swirl Effect is more preferable.The method of testing of Portable wind apparatus test device can meet fan test needs and convenience of calculation.

Brief description

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

Fig. 2 is the left view of Fig. 1；

Fig. 3 is the enlarged drawing at a in Fig. 1.

In figure: blower fan 1, air inlet break whirlpool device 2, broken scroll 21, tapered broken whirlpool 22, taper type broken whirlpool sleeve pipe 23, fix Bar 24, measurement apparatus 3, stud 31, testing tube 32, conical through-hole 33, reference test bar 34, measuring head 35, Pitot tube 36, sealing ring 37th, clamp nut 38, outer cone section 39, inner cone section 310, cone shaped countersink 311, airflow commutating device 4, rectifying tube 41, riser 42, horizontal stroke Plate 43, gas channel 44.

Specific embodiment

It is shown below in conjunction with the accompanying drawings that the present invention is described further.

As shown in accompanying drawing 1, accompanying drawing 2, accompanying drawing 3: a kind of Portable wind apparatus test device, comprising: blower fan 1, whirlpool dress is broken in air inlet Put 2, the measurement apparatus 3 that rear end is detachably connected with blower fan 1 air inlet；Respectively with broken whirlpool device rear end and measurement apparatus 3 front end The airflow commutating device 4 connecting.

In the present embodiment:

Described air inlet is broken whirlpool device 2 and is included: front end is more than the broken scroll 21 of rear end, and small end is located at the tapered broken whirlpool head of front side 22, positioned at tapered broken whirlpool 22 outside and small end is located at the taper type of front side and breaks whirlpool sleeve pipe 23, two arranged in a crossed manner and with tapered The fix bar 24 of broken whirlpool 22 rear end mode connects for screw；Tapered broken whirlpool 22 is located in broken scroll 21；The two ends of fix bar 24 are respectively Inner side mode connects for screw with broken scroll 21；Taper type breaks big end and fix bar 24 mode connects for screw of whirlpool sleeve pipe 23；Taper type breaks whirlpool The internal diameter of sleeve pipe 23 small end is more than the external diameter that taper type breaks whirlpool sleeve pipe 23 end greatly.

Described measurement apparatus 3 include: outer gusset is provided with stud 31 and the test of rear end and blower fan 1 air inlet mode connects for screw Pipe 32, the conical through-hole 33 located at stud 31 end face and with testing tube 32 inner side insertion；It is provided with and be arranged in conical through-hole 33 Reference test bar 34 and be located in testing tube 32 and rear end is integrally formed the Pitot tube 36 of the measuring head 35 being connected with reference test bar 34, seals Circle 37, clamp nut 38；The small end of conical through-hole 33 is located inside testing tube 32；Sealing ring 37 is provided with outer cone section 39 and and taper The inner cone section 310 of through hole 33 coupling, clamp nut 38 is provided with the cone shaped countersink 311 mating with outer cone section 39；Clamp nut 38 with Stud 31 is threaded and cone shaped countersink 311 pushes down outer cone section 39.

Described airflow commutating device 4 includes: the rectifying tube 41 of front end and broken scroll 21 rear end mode connects for screw, located at rectification Two risers 42 in pipe 41 and two transverse slats 43 arranged in a crossed manner with riser 42；Rectifying tube 41 is separated by riser 42 and transverse slat 43 Become nine gas channels 44 with rectifying tube 41 front-end and back-end insertion respectively；The rear end of rectifying tube 41 and the front end of testing tube 32 Mode connects for screw.

The shape of cross section of described broken scroll 21 is square；The shape of cross section of testing tube 32 is square；Rectification The shape of cross section of pipe 41 is square.

A kind of method of testing of portable fan 1 test device, step one, calculate inlet -duct area a1, a1 area is defined as The cross-sectional area of rectifying tube 41 rear end；Calculate discharge area a2, a2 area is defined as the cross section face of blower fan 1 air inlet Long-pending；Step 2, test environment atmospheric pressure pba and environment temperature θ_a(℃)；Step 3, opens blower fan 1, and Pitot tube 36 measures always Pressure p1t, static pressure p1s (negative pressure), pressure reduction p1d；Step 4, calculates atmospheric density ρ under experimental enviroment by formula_a:Step 5, by formula calculating air quantity qv: Step 6, calculates total head pft by formula: obtained by pft=p2t-p1t=p2d+p2s- (p1d+p1s), because p2s=0, and institute With pft=p2d-p1t；

$\begin{array}{c}{p}_{2d}=\frac{{\mathrm{\ρ}}_a\×v_2^2}{2}=\frac{{\mathrm{\ρ}}_a\×{\left(\frac{a_1\×v_1}{a_2}\right)}^2}{2}\\ =\frac{{\mathrm{\ρ}}_a\×{\left(\frac{a_1\×\sqrt{\frac{2p_{1d}}{{\mathrm{\ρ}}_a}}}{a_2}\right)}^2}{2}={\left(\frac{a_1}{a_2}\right)}^2\×p_{1d}\end{array}$

So:

Step 7, by formula calculated static pressure pfs:pfs=pft-pfd=p2s- (p1d+p1s), because p2s=0, therefore: pfs =-p1t；

Step 8, is calculated by formula and marks condition total head pbft:

$p_{bft}=\frac{{\mathrm{\ρ}}_n}{{\mathrm{\ρ}}_a}\×p_{ft}$

ρ in formula_n=1.20518kg/m3；

Step 9, calculates mark condition total pressure efficiency η by formula_b:

${\mathrm{\η}}_b\left(\%\right)=\frac{q_v\×p_{bft}}{p}\×100;$

Step 10, is calculated by formula and marks condition static pressure pbfs:

ρ in formula_n=1.20518kg/m3.

The invention has the beneficial effects as follows: this Portable wind apparatus test device fan test efficiency is higher with measuring accuracy relatively High.The Pitot tube of measurement apparatus is to measure air-flow stagnation pressure and static pressure to determine a kind of tube of air velocity, can effectively survey Amount air-flow stagnation pressure and static pressure and high precision；Sealing ring is provided with outer cone section and the inner cone section mated with conical through-hole, and clamp nut sets There is the cone shaped countersink mating with outer cone section, clamp nut is threadeded with stud and cone shaped countersink pushes down outer cone section, makes sealing ring Tightly push down the outer gusset of reference test bar and conical through-hole after deformation, improve sealing.Airflow commutating device is simple and practical；Some Individual gas channel makes gas flow uniform, improves test accuracy.The shape of cross section of broken scroll, testing tube and rectifying tube is Rectangle, beneficial to fabrication and installation and consistent beneficial to several gas channel size shape.Outside the head of tapered broken whirlpool and small end The taper type that internal diameter is more than the external diameter that taper type breaks the big end of whirlpool sleeve pipe breaks whirlpool sleeve pipe, makes elimination intake swirl effect more preferable.Portable The method of testing of formula fan test device can meet fan test needs and convenience of calculation.

The present invention can change into that various ways are apparent to one skilled in the art, and such change is not considered as Depart from the scope of the present invention.All such technical staff to described field obviously change, and are included within this right Within the scope of requirement.

Claims (6)

1. a kind of Portable wind apparatus test device, comprising: blower fan；It is characterized in that: described Portable wind apparatus test device also wraps Include: whirlpool device, the measurement apparatus that rear end and air inlet are detachably connected are broken in air inlet；Respectively with broken whirlpool device rear end and measurement The airflow commutating device that device front end connects；Air inlet is broken whirlpool device and is included: front end is more than the broken scroll of rear end, and small end is located at front side Tapered broken whirlpool head, several fix bars that are arranged in a crossed manner and being connected with tapered broken whirlpool head rear end；Tapered broken whirlpool head is located at broken whirlpool Guan Zhong；The two ends of fix bar are connected with the inner side of broken scroll respectively.

2. Portable wind apparatus test device according to claim 1, is characterized in that: described measurement apparatus include: outside Enclose and be provided with stud and testing tube that rear end is detachably connected with air inlet, located at stud end face and with testing tube inside insertion Conical through-hole；It is provided with the reference test bar being arranged in conical through-hole and be located in testing tube and the test that is connected with reference test bar of rear end The Pitot tube of head, sealing ring, clamp nut；The small end of conical through-hole is located inside testing tube；Sealing ring be provided with outer cone section and with The inner cone section of conical through-hole coupling, clamp nut is provided with the cone shaped countersink mating with outer cone section；Clamp nut is with stud screw thread even Connect and cone shaped countersink pushes down outer cone section.

3. Portable wind apparatus test device according to claim 2, is characterized in that: described airflow commutating device includes: The rectifying tube that front end is connected with broken scroll rear end, several risers in rectifying tube are arranged in a crossed manner with riser with several Transverse slat；Rectifying tube is separated into several gas channels with the insertion of rectifying tube front-end and back-end respectively by riser and transverse slat；Rectification The rear end of pipe is connected with the front end of testing tube.

4. Portable wind apparatus test device according to claim 3, is characterized in that: the shape of cross section of described broken scroll For rectangle；The shape of cross section of testing tube is rectangle；The shape of cross section of rectifying tube is rectangle.

5. the Portable wind apparatus test device according to claim 1 or 2 or 3 or 4, is characterized in that: whirlpool is broken in described air inlet Device also includes: outside the head of tapered broken whirlpool and small end is located at the taper type of front side and breaks whirlpool sleeve pipe；Taper type breaks whirlpool sleeve pipe Big end is connected with fix bar；The internal diameter that taper type breaks whirlpool sleeve pipe small end is more than the external diameter that taper type breaks the big end of whirlpool sleeve pipe.

6. a kind of method of testing of Portable wind apparatus test device, is characterized in that: described Portable wind apparatus test device has Claim 1 to the Portable wind apparatus test device described in claim 5 limiting structure；Step one, calculates inlet -duct area a1, A1 area is defined as the cross-sectional area of rectifying tube rear end；Calculate discharge area a2, a2 area is defined as at air inlet Cross-sectional area；Step 2, test environment atmospheric pressure pba and environment temperature θ_a(oc)；Step 3, opens blower fan, Pi Tuo Pipe measures stagnation pressure p1t, static pressure p1s (negative pressure), pressure reduction p1d；Step 4, calculates the atmospheric density under experimental enviroment by formula ρ_a:Step 5, by formula calculating air quantity qv: Step 6, by formula calculating total head pft:Step 7, by formula calculated static pressure pfs: Pfs=pft-pfd=p2s- (p1d+p1s), because p2s=0, therefore: pfs=-p1t；Step 8, calculates mark condition by formula complete Pressure pbft:

ρ in formula_n=1.20518kg/m3；

Step 9, calculates mark condition total pressure efficiency η by formula_b:

${\mathrm{\η}}_b\left(\%\right)=\frac{q_v\×p_{bft}}{p}\×100;$

Step 10, is calculated by formula and marks condition static pressure pbfs:

ρ in formula_n=1.20518kg/m3.