CN203981219U - Wing serial sampling air flow sensor for variable air volume system - Google Patents
Wing serial sampling air flow sensor for variable air volume system Download PDFInfo
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- CN203981219U CN203981219U CN201420424990.7U CN201420424990U CN203981219U CN 203981219 U CN203981219 U CN 203981219U CN 201420424990 U CN201420424990 U CN 201420424990U CN 203981219 U CN203981219 U CN 203981219U
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- stopple coupon
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- static pressure
- total head
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Abstract
The utility model discloses a kind of wing serial sampling air flow sensor for variable air volume system, comprise at least four stopple coupons that are assemblied in even cloth on intake stack xsect, the opposite end of stopple coupon is connected and is interconnected by center Connection Block, and wherein the outer end of a stopple coupon is equipped with valve Connection Block; Described stopple coupon is airfoil type, and in every stopple coupon, along the air intake direction cylindrical cavity that twice isolate mutually that be arranged in parallel, the cavity that is positioned at stopple coupon windward side is total head cavity, and the windward side that is positioned at stopple coupon is also provided with total head and surveys groove; The cavity that is positioned at stopple coupon leeward side is static pressure cavity, and the lee face that is positioned at stopple coupon is also provided with static pressure and surveys groove.The utility model adopts the survey groove of whole piece formula to carry out diametrically orthoscopic continuous coverage to total head and static pressure, has abandoned the sampling mode of tradition with thief hole Points replacing surfaces, and air measuring homogeneity is improved greatly, Reliable guarantee measuring accuracy.
Description
Technical field
The utility model relates to air-conditioning technical field, particularly a kind of air flow sensor being applied in air-conditioning system.
Background technology
Vav terminal routine is divided into unpowered type and the large classification of fan powered two, and most of vav terminal all adopts pressure independent type control mode, can not be subject to upstream air feed pressure interference, controls exactly a wind air quantity that enters end.The change of a wind air quantity is to change according to the variation of control object, and control object is generally indoor temperature, can be also gas concentration lwevel or room force value etc.And to accurately control air quantity, and first must measure exactly air quantity, the measurement of air quantity is at vav terminal, flow sensor to be installed to measure conventionally.
Flow sensor generally adopts pitot tube principle, by measuring the total head of air and the difference of static pressure (being dynamic pressure), tries to achieve wind speed, then multiplies each other and calculate air quantity with pipeline area.Specifically be performed such: the dynamic pressure that flow sensor records air-flow flows to pressure difference transmitter, pressure difference transmitter transfers pressure difference signal to electric signal and flows to controller, and controller calculates actual air volume according to formula and air volume coefficient.The Main Function of flow sensor be can range ability internal linear reflect actual air volume.And in current industry, the precision under low flow velocity of pressure difference transmitter is not good, therefore the measurement of flow sensor need to have output amplification coefficient, the pressure difference signal amplification that is about to physics flows to pressure difference transmitter again, by pressure difference transmitter, become electric signal and export to controller and carry out the computing reduction of flow sensor amplification coefficient (comprise in computing calculate), calculate actual air volume.
Air flow sensor is subject to the restriction of mounting condition at present, is difficult to guarantee sufficiently long straight length before and after general measure device, causes apparatus for measuring air quantity test inaccurate; While is unreasonable because measuring point arranges, and causes the interior measured value of whole range ability not linear; The structure of air flow sensor and the point of fixity being connected with pipeline are not enough, cause the rigidity of air flow sensor and damage resistance not enough, easily damage.
The applicant's formerly patented claim CN203414115U discloses a kind of air flow sensor of diesis structure, comprise two groups of stopple coupons and center Connection Block, every group of stopple coupon comprises total head stopple coupon and the static pressure stopple coupon being arranged in parallel, two groups of stopple coupons run through respectively center Connection Block, and intersect vertically and different, the even total head gaging hole that is furnished with on total head stopple coupon, the even static opening that is furnished with on static pressure stopple coupon.In this, air flow sensor adopts pitot tube principle, can record average pressure reduction, but its course of work Hou is used several sampling gaging holes to carry out air pressure-sampling, and the layout of thief hole some be equidistant or according to etc. link area arrange, this kind of sampling method cannot very accurately reflect the force value of whole duct cross-section, especially at air-flow, not in fully uniform-flow, more can cause serious error.
Utility model content
The utility model technical issues that need to address are to provide a kind of air flow sensor that can accurately measure intake being applied in variable air volume system.
For solving the problems of the technologies described above, technical solution adopted in the utility model is as follows.
Wing serial sampling air flow sensor for variable air volume system, comprise at least four stopple coupons that are assemblied in even cloth on intake stack xsect, the opposite end of stopple coupon is connected and is interconnected by center Connection Block, and wherein the outer end of a stopple coupon is equipped with the valve Connection Block that connects pressure difference transmitter by flexible rubber hose; Described stopple coupon is airfoil type, in every stopple coupon along the air intake direction cylindrical cavity that twice isolate mutually that be arranged in parallel, the cavity that is positioned at stopple coupon windward side is total head cavity, and the windward side that is positioned at stopple coupon is also provided with and is parallel to the total head that total head cavity and medial extremity be communicated with total head cavity and surveys groove; The cavity that is positioned at stopple coupon leeward side is static pressure cavity, and the lee face that is positioned at stopple coupon is also provided with and is parallel to the static pressure that static pressure cavity and medial extremity be communicated with static pressure cavity and surveys groove.
Improvement of the present utility model is: the windward side of described center Connection Block is circular conical surface.
Improvement of the present utility model is also: described valve Connection Block comprises template Connection Block, the middle part of template Connection Block is provided with respectively and total head cavity end and static pressure cavity end equipped two valves mutually, is also provided with intake stack by the mutually equipped bolt hole of bolt on the template Connection Block in two valves outsides.
Owing to having adopted above technical scheme, the obtained technical progress of the utility model is as follows.
The utility model has been taked total head and the design of static pressure sampling integrated formula, makes stopple coupon have better rigidity; Adopt the survey groove of whole piece formula to carry out diametrically orthoscopic continuous coverage to total head and static pressure, abandoned the sampling mode of tradition with thief hole Points replacing surfaces, air measuring homogeneity is improved greatly, Reliable guarantee measuring accuracy.Center of the present utility model Connection Block adopts cone structure and stopple coupon to adopt airfoil type structure, has reduced the interference that flow perturbation brings measurement effect.Static tube and ram-air pipe adopt cross syndeton, fix with air inlet inwall multiple spot, and stabilized structure, makes whole air inlet system have good damage resistance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is STRUCTURE DECOMPOSITION schematic diagram of the present utility model;
Fig. 3 is partial structurtes schematic diagram of the present utility model.
Wherein: 1. stopple coupon, 1-A. total head cavity, 1-B. static pressure cavity, 1-C. total head is surveyed groove, and 1-D. static pressure is surveyed groove, 2. center Connection Block, 3. valve Connection Block.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further elaborated.
A kind of wing serial sampling air flow sensor for variable air volume system, comprise at least four stopple coupons 1 that are assemblied in even cloth on intake stack xsect, the opposite end of stopple coupon is connected and is interconnected by center Connection Block 2, and wherein the outer end of a stopple coupon is equipped with the valve Connection Block 3 that connects pressure difference transmitter by flexible rubber hose.In the present embodiment, stopple coupon is provided with four altogether, and its one-piece construction as shown in Figure 1.
Stopple coupon 1 in the utility model is airfoil type, its structure as shown in Figure 2, adopt the stopple coupon of airfoil type structure not only can effectively reduce windage, can reduce better static pressure measured value, make its dynamic pressure (total head-static pressure) there is larger amplification coefficient, and stopple coupon employing integral structure, be conducive to reduce assembly difficulty, improve the rigidity of whole sensor.
In every stopple coupon along the air intake direction cylindrical cavity that twice isolate mutually that be arranged in parallel, the cavity that is positioned at stopple coupon windward side is total head cavity 1-A, and the windward side that is positioned at stopple coupon is also provided with and is parallel to the total head that total head cavity and medial extremity be communicated with total head cavity and surveys groove 1-C; The cavity that is positioned at stopple coupon leeward side is static pressure cavity 1-B, and the lee face that is positioned at stopple coupon is also provided with and is parallel to the static pressure that static pressure cavity and medial extremity be communicated with static pressure cavity and surveys groove 1-D, as shown in Figure 3.
The windward side of the present embodiment Zhong center Connection Block is circular conical surface, can greatly reduce windage, and reduces the interference that flow perturbation brings measurement effect.
Valve Connection Block described in the utility model comprises template Connection Block, the middle part of template Connection Block is provided with respectively and total head cavity end and static pressure cavity end equipped two valves mutually, is also provided with intake stack by the mutually equipped bolt hole of bolt on the template Connection Block in two valves outsides.The outer end of other three stopple coupons is also respectively arranged with two point of fixity, for fastening and be tightly connected by bolt or rivet and intake stack, makes one-piece construction have good rigidity.
When the utility model is used, adopt bolt or rivet that the point of fixity of stopple coupon outer end is fixedly connected in intake stack, and make total head survey groove 1-C over against air intake air-flow, static pressure is surveyed groove 1-D back to air intake direction.In measuring process, total head is surveyed whole continuous total head radially in the intake stack that groove 1-C measures and is changed, and after averaging, then the pressure difference transmitter that is delivered to controller by the valve Connection Block 3 that connects and flexible glue tracheae, simultaneously, static pressure is surveyed groove 1-D and is measured whole continuous static pressure variation radially in intake stack, and after averaging, the pressure difference transmitter that is delivered to controller by the valve Connection Block 3 that connects and flexible glue tracheae, pressure difference transmitter changes the total head receiving and static pressure into electric signal transmission to controller and carries out computing, by total head, deduct static pressure, obtaining pressure differential is dynamic pressure, by the calculating (reduction that comprises flow sensor amplification coefficient in computing is calculated) of controller, convert actual air flow velocity to, by air velocity * circulation area, calculate actual air output, it is air mass flow.
Claims (3)
1. for the wing serial sampling air flow sensor of variable air volume system, it is characterized in that: comprise at least four stopple coupons (1) that are assemblied in even cloth on intake stack xsect, the opposite end of stopple coupon is connected and is interconnected by center Connection Block (2), and wherein the outer end of a stopple coupon is equipped with the valve Connection Block (3) that connects pressure difference transmitter by flexible rubber hose; Described stopple coupon (1) is airfoil type, in every stopple coupon along the air intake direction cylindrical cavity that twice isolate mutually that be arranged in parallel, the cavity that is positioned at stopple coupon windward side is total head cavity (1-A), and the windward side that is positioned at stopple coupon is also provided with and is parallel to the total head that total head cavity and medial extremity be communicated with total head cavity and surveys groove (1-C); The cavity that is positioned at stopple coupon leeward side is static pressure cavity (1-B), and the lee face that is positioned at stopple coupon is also provided with and is parallel to the static pressure that static pressure cavity and medial extremity be communicated with static pressure cavity and surveys groove (1-D).
2. the wing serial sampling air flow sensor for variable air volume system according to claim 1, is characterized in that: the windward side of described center Connection Block is circular conical surface.
3. according to the wing serial sampling air flow sensor for variable air volume system described in claim 1 or 2 any one, it is characterized in that: described valve Connection Block comprises template Connection Block, the middle part of template Connection Block is provided with respectively and total head cavity end and static pressure cavity end equipped two valves mutually, is also provided with intake stack by the mutually equipped bolt hole of bolt on the template Connection Block in two valves outsides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420424990.7U CN203981219U (en) | 2014-07-30 | 2014-07-30 | Wing serial sampling air flow sensor for variable air volume system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420424990.7U CN203981219U (en) | 2014-07-30 | 2014-07-30 | Wing serial sampling air flow sensor for variable air volume system |
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| Publication Number | Publication Date |
|---|---|
| CN203981219U true CN203981219U (en) | 2014-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420424990.7U Active CN203981219U (en) | 2014-07-30 | 2014-07-30 | Wing serial sampling air flow sensor for variable air volume system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579247A (en) * | 2019-09-16 | 2019-12-17 | 南华大学 | Telescopic air volume cover for measuring air volume of spherical nozzle |
| CN111174839A (en) * | 2020-01-17 | 2020-05-19 | 珠海格力电器股份有限公司 | Air quantity measuring device |
-
2014
- 2014-07-30 CN CN201420424990.7U patent/CN203981219U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579247A (en) * | 2019-09-16 | 2019-12-17 | 南华大学 | Telescopic air volume cover for measuring air volume of spherical nozzle |
| CN110579247B (en) * | 2019-09-16 | 2020-10-16 | 南华大学 | Telescopic air volume cover for measuring air volume of spherical nozzle |
| CN111174839A (en) * | 2020-01-17 | 2020-05-19 | 珠海格力电器股份有限公司 | Air quantity measuring device |
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