CN111220216A - Circular air volume and air pressure measuring valve and using method - Google Patents
Circular air volume and air pressure measuring valve and using method Download PDFInfo
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- CN111220216A CN111220216A CN202010164387.XA CN202010164387A CN111220216A CN 111220216 A CN111220216 A CN 111220216A CN 202010164387 A CN202010164387 A CN 202010164387A CN 111220216 A CN111220216 A CN 111220216A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000003068 static effect Effects 0.000 claims abstract description 63
- 238000007789 sealing Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000009530 blood pressure measurement Methods 0.000 claims description 2
- 210000003437 trachea Anatomy 0.000 claims 1
- 238000004378 air conditioning Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 5
- 238000009423 ventilation Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention relates to the technical field of building ventilation and air conditioning engineering, and discloses a circular air volume and air pressure measuring valve and a using method thereof, wherein the circular air volume and air pressure measuring valve comprises a valve body, a measuring sheet, a fixing frame, an air pipe connecting piece and an air volume and air pressure display device; two measuring pieces are arranged in the valve body, are distributed in a cross shape and do not interfere with each other, and the windward surfaces of the two measuring pieces are in the same direction; one end of the measuring piece is fixed through a fixing frame, the other end of the measuring piece is fixed through an air pipe connecting piece, one end of a total pressure average pipe orifice and one end of a static pressure average pipe orifice of the measuring piece are plugged by the fixing frame, and the other end of the total pressure average pipe orifice and the other end of the static pressure average pipe orifice are connected with an air quantity and air pressure display device through the. The invention has the beneficial effects that: the air quantity and air pressure measuring device is integrated with the valve body, the cost is low, the occupied space is small, the flanges are arranged at the two ends of the valve, the connection on the existing circular pipeline is facilitated, the air quantity and air pressure display device can be started at any time when needed, the air quantity and air pressure in the pipeline can be monitored in real time, and the defects that the traditional measuring method is complex to install and low in measuring precision are overcome.
Description
Technical Field
The invention relates to the technical field of building ventilation and air conditioning engineering, in particular to a circular air volume and air pressure measuring valve and a using method thereof.
Background
The ventilation and air-conditioning system only has detection equipment with laboratory or laboratory precision requirements at present, the constant-speed pipe detector in the market mainly focuses on detection of chemical, petroleum and other liquid fluids, and does not completely meet the precision requirements of GB/T50243-2016 and GB51251-2016 and a special air volume and air pressure measuring tool arranged at a measuring point position, although a laboratory-level pitot tube is adopted for detecting the air volume and the air pressure of the ventilation and air-conditioning system, when the detecting point position is too much or is limited by the installation position of some fans and other reasons, the detection cannot be realized or the daily maintenance cannot be carried out according to the standard requirement (9.0.3 in GB51251-2016 requires that the fan system is subjected to one-time performance detection including the air volume and the air pressure every quarter), the workload and the working difficulty (the installation position of some fans cannot be detected by the existing pitot tube method), even if the national standard has requirements, the practical operation can not be realized, so that a circular air volume and air pressure measuring valve special for ventilation and air conditioning, which can carry out practical and convenient detection and can meet the precision requirements of GB/T50243-2016 and GB51251-2016, is urgently needed.
Disclosure of Invention
In order to overcome the defects, the invention provides a circular air volume and air pressure measuring valve.
In order to overcome the defects, the invention also provides a using method of the circular air volume and air pressure measuring valve.
In order to achieve the purpose, the technical scheme of the invention is as follows: a circular air volume and air pressure measuring valve comprises a valve body, a measuring sheet, a fixing frame, an air pipe connecting piece and an air volume and air pressure display device, wherein the valve body is cylindrical, and flanges with mounting holes are respectively arranged at the ends of two sides of the valve body; two measuring pieces are arranged in the valve body, are distributed in a cross shape and do not interfere with each other, and the windward surfaces of the two measuring pieces are in the same direction; one end of each measuring piece is fixed on the inner wall of one side of the valve body through a fixing frame, and the other end of each measuring piece is fixed on the inner wall of the other side of the valve body through an air pipe connecting piece; the measuring sheet is provided with a total pressure average pipe hole and a static pressure average pipe hole which are parallel in the length direction, and the fixing frame seals and seals a total pressure average pipe hole opening and a static pressure average pipe hole opening of the end of the measuring sheet on the side where the fixing frame is located; the air pipe connecting piece is provided with two air outlet pipe joints, one sides of the two air outlet pipe joints facing the measuring piece are respectively communicated with the total pressure average pipe orifice or the static pressure average pipe orifice in a sealing mode, and the other sides of the two air outlet pipe joints of each measuring piece are respectively communicated with the air quantity and air pressure display device through air pipes.
Preferably, the measuring piece is provided with a total pressure average tube hole, a static pressure average tube hole and a temperature compensation tube hole which are parallel in the length direction, a total pressure hole communicated with the total pressure average tube hole is formed in the windward side of the measuring piece, a static pressure hole penetrating through the static pressure average tube hole is formed in the side wall of the measuring piece, and the plane where the static pressure hole is located is perpendicular to the plane where the total pressure hole is located.
Preferably, the measuring sheet is provided with a total pressure average tube hole, a static pressure average tube hole and a temperature compensation tube hole which are parallel to each other in the length direction, a total pressure long hole groove communicated with the total pressure average tube hole is formed in the windward side of the measuring sheet, and the length of the total pressure long hole groove is the same as that of the total pressure average tube hole; the side wall of the measuring piece is provided with a static pressure long hole groove which penetrates through the static pressure average pipe hole, the length of the static pressure long hole groove is the same as that of the total pressure average pipe hole, and a connecting piece passing through an axis is arranged in the static pressure long hole groove; the plane of the static pressure long hole groove is vertical to the plane of the total pressure long hole groove; the connecting piece and the total pressure long hole groove are positioned on the same plane and are connected with two static pressure average pipe holes divided by the static pressure long hole groove.
A use method of a circular air volume and air pressure measuring valve comprises the following steps:
1) mounting a circular air quantity and air pressure measuring valve in the middle of a circular air supply pipeline through flanges at two ends, so that the windward side of a measuring piece is opposite to the air flow direction of the air supply pipeline;
2) respectively measuring the total pressure in the air supply pipeline through the total pressure average pipe holes of the two measuring sheets to obtain a total pressure average;
3) respectively measuring the static pressure in the air supply pipeline through static pressure average pipe holes of the two measuring sheets to obtain a static pressure average;
4) obtaining the air volume by the following formula (1), formula (2) and formula (3);
total mean-static mean = dynamic pressure (1)
Dynamic pressure =0.5 × air density (kg/m3) × wind speed (m/s) square (2)
Wind speed × wind volume shows the effective sectional area of the tuyere = wind volume (3).
The invention has the beneficial effects that: the utility model provides a circular amount of wind pressure measurement valve, amount of wind pressure measuring device is as an organic whole with the valve body, and is with low costs, and occupation space is little, and the valve both ends are equipped with the flange, are convenient for connect on current circular pipeline, can realize waiting to start amount of wind pressure display device at any time when needs, and the amount of wind pressure in the real-time supervision pipeline has avoided traditional measuring method loaded down with trivial details, defect that measurement accuracy is not high.
Drawings
Fig. 1 is a schematic structural view of a circular air volume and air pressure measuring valve of the present invention.
Fig. 2 is a schematic view of a test strip structure in embodiment 1 of the present invention.
Fig. 3 is a cross-sectional view of fig. 2.
Fig. 4 is a schematic view of a test strip structure in embodiment 2 of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1
As shown in fig. 1, fig. 2 and fig. 3, the circular air volume and air pressure measuring valve comprises a valve body 1, a measuring piece 2, a fixing frame 3, an air pipe connecting piece 4 and an air volume and air pressure display device 5, wherein the valve body 1 is cylindrical, and the ends at two sides are respectively provided with a flange 6 with a mounting hole; two measuring pieces 2 are arranged in the valve body 1, the two measuring pieces 2 are distributed in a cross shape and do not interfere with each other, and windward surfaces of the two measuring pieces 2 are in the same direction; one end of each measuring piece 2 is fixed on the inner wall of one side of the valve body 1 through a fixing frame 3, and the other end is fixed on the inner wall of the other side of the valve body 1 through an air pipe connecting piece 4; the measuring sheet 2 is provided with a total pressure average tube hole 201 and a static pressure average tube hole 202 which are parallel in the length direction, and the fixing frame 3 seals and seals a total pressure average tube hole opening and a static pressure average tube hole opening of the measuring sheet end on the side where the fixing frame is located; the air pipe connecting piece 4 is provided with two air outlet pipe joints, one sides of the two air outlet pipe joints facing the measuring piece are respectively communicated with the total pressure average pipe hole opening or the static pressure average pipe hole opening in a sealing mode, and the other sides of the two air outlet pipe joints are respectively communicated with the air quantity and air pressure display device 5 through air pipes.
In this embodiment, the measuring piece 2 is provided with a total pressure average pipe hole 201, a static pressure average pipe hole 202 and a temperature compensation pipe hole 203 which are parallel in the length direction, a total pressure hole 204 communicated with the total pressure average pipe hole is arranged on the windward side of the measuring piece, a static pressure hole 205 penetrating through the static pressure average pipe hole is arranged on the side wall of the measuring piece, and the plane of the static pressure hole 205 is perpendicular to the plane of the total pressure hole 204.
The total pressure holes 204 and the static pressure holes 205 are arranged in the number and the distribution positions according to GB/T1236-2017 or
GB/T50243-2016 or GB 51251-2017. The air volume calculation method comprises the following steps: the static pressure measured by the static pressure average pipe hole is subtracted from the total pressure measured by the total pressure average pipe hole to obtain the dynamic pressure, then the wind speed is calculated according to the dynamic pressure, the wind volume is obtained according to the multiplication of the wind speed and the sectional area, and the on-line calculation and detection can be automatically carried out.
Example 2
As shown in fig. 1 and fig. 4, the circular air volume and air pressure measuring valve comprises a valve body 1, a measuring sheet 2, a fixing frame 3, an air pipe connecting piece 4 and an air volume and air pressure display device 5, wherein the valve body 1 is cylindrical, and the ends at two sides are respectively provided with a flange 6 with a mounting hole; two measuring pieces 2 are arranged in the valve body 1, the two measuring pieces 2 are distributed in a cross shape and do not interfere with each other, and windward surfaces of the two measuring pieces 2 are in the same direction; one end of each measuring piece 2 is fixed on the inner wall of one side of the valve body 1 through a fixing frame 3, and the other end is fixed on the inner wall of the other side of the valve body 1 through an air pipe connecting piece 4; the measuring sheet 2 is provided with a total pressure average tube hole 201 and a static pressure average tube hole 202 which are parallel in the length direction, and the fixing frame 3 seals and seals a total pressure average tube hole opening and a static pressure average tube hole opening of the measuring sheet end on the side where the fixing frame is located; the air pipe connecting piece 4 is provided with two air outlet pipe joints, one sides of the two air outlet pipe joints facing the measuring piece are respectively communicated with the total pressure average pipe hole opening or the static pressure average pipe hole opening in a sealing mode, and the other sides of the two air outlet pipe joints are respectively communicated with the air quantity and air pressure display device 5 through air pipes.
The measuring piece 2 is provided with a total pressure average tube hole 201, a static pressure average tube hole 202 and a temperature compensation tube hole 203 which are parallel in the length direction, the windward side of the measuring piece is provided with a total pressure long hole groove 206 communicated with the total pressure average tube hole, and the length of the total pressure long hole groove is the same as that of the total pressure average tube hole; a static pressure long hole groove 207 penetrating through the static pressure average pipe hole is formed in the side wall of the measuring piece, the length of the static pressure long hole groove is the same as that of the total pressure average pipe hole, and a connecting piece passing through an axis is arranged in the static pressure long hole groove; the plane of the static pressure long hole groove is vertical to the plane of the total pressure long hole groove; the connecting piece and the total pressure long hole groove are positioned on the same plane and are connected with two static pressure average pipe holes divided by the static pressure long hole groove.
This structure adopts the static pressure slot and total pressure slot of all-through groove, has further optimized among embodiment 1 that need the fixed point distance to set up the loaded down with trivial details problem of processing that total pressure hole and static pressure hole cause, and the air inlet is more even simultaneously, and measurement accuracy is higher.
The use method of the circular air volume and air pressure measuring valve in the embodiment 1 and the embodiment 2 comprises the following steps: the flanges at the two ends of the valve body are respectively connected with the circular ventilating duct in a sealing mode, and the windward side of the side face faces the direction of incoming wind, so that the air quantity and air pressure display device can be started at any time after one-time installation, the air quantity and air pressure in the pipeline can be measured, and the defects that the traditional measuring method is complex in installation and low in measuring precision are overcome.
Example 3
A use method of a circular air volume and air pressure measuring valve comprises the following steps:
1) the circular air quantity and air pressure measuring valve shown in the embodiment 1 or 2 is arranged in the middle of a circular air supply pipeline through flanges at two ends, so that the windward side of a measuring piece is opposite to the air flow direction of the air supply pipeline;
2) respectively measuring the total pressure in the air supply pipeline through the total pressure average pipe holes of the two measuring sheets to obtain a total pressure average;
3) respectively measuring the static pressure in the air supply pipeline through static pressure average pipe holes of the two measuring sheets to obtain a static pressure average;
4) obtaining the air volume by the following formula (1), formula (2) and formula (3);
total mean-static mean = dynamic pressure (1)
Dynamic pressure =0.5 × air density (kg/m3) × wind speed (m/s) square (2)
Wind speed × wind volume shows the effective sectional area of the tuyere = wind volume (3).
In practical application, the air volume detection method can be integrated into an air volume display and the final result air volume is displayed, the integration method belongs to the prior art, and for example, an algorithm and a program are burnt into a chip of the air volume display to realize automatic test and display during starting.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (4)
1. The utility model provides a circular amount of wind pressure measurement valve, includes valve body, survey piece, mount, trachea connecting piece and wind volume wind pressure display device, its characterized in that: the valve body is cylindrical, and flanges with mounting holes are respectively arranged at the end heads at the two sides of the valve body; two measuring pieces are arranged in the valve body, are distributed in a cross shape and do not interfere with each other, and the windward surfaces of the two measuring pieces are in the same direction; one end of each measuring piece is fixed on the inner wall of one side of the valve body through a fixing frame, and the other end of each measuring piece is fixed on the inner wall of the other side of the valve body through an air pipe connecting piece; the measuring sheet is provided with a total pressure average pipe hole and a static pressure average pipe hole which are parallel in the length direction, and the fixing frame seals and seals a total pressure average pipe hole opening and a static pressure average pipe hole opening of the end of the measuring sheet on the side where the fixing frame is located; the gas pipe connecting piece is provided with two gas outlet pipe joints, and one sides of the two gas outlet pipe joints, which face the measuring sheet, are respectively communicated with the total pressure average pipe orifice or the static pressure average pipe orifice in a sealing manner; the other sides of the two air outlet pipe joints of each measuring piece are respectively communicated with an air quantity and air pressure display device through air pipes.
2. The circular air volume and wind pressure measuring valve according to claim 1, characterized in that: the measuring piece is provided with a total pressure average tube hole, a static pressure average tube hole and a temperature compensation tube hole which are parallel in the length direction, a total pressure hole communicated with the total pressure average tube hole is formed in the windward side of the measuring piece, a static pressure hole penetrating through the static pressure average tube hole is formed in the side wall of the measuring piece, and the plane where the static pressure hole is located is perpendicular to the plane where the total pressure hole is located.
3. The circular air volume and wind pressure measuring valve according to claim 1, characterized in that: the wind-facing surface of the measuring piece is provided with a total-pressure long hole groove communicated with the total-pressure average hole, and the length of the total-pressure long hole groove is the same as that of the total-pressure average hole; the side wall of the measuring piece is provided with a static pressure long hole groove which penetrates through the static pressure average pipe hole, the length of the static pressure long hole groove is the same as that of the total pressure average pipe hole, and a connecting piece passing through an axis is arranged in the static pressure long hole groove; the plane of the static pressure long hole groove is vertical to the plane of the total pressure long hole groove; the connecting piece and the total pressure long hole groove are positioned on the same plane and are connected with two static pressure average pipe holes divided by the static pressure long hole groove.
4. The use method of the circular air volume and air pressure measuring valve is characterized in that: the method comprises the following steps:
1) installing the circular air quantity and air pressure measuring valve of any one of claims 1 to 3 in the middle of a circular air supply pipeline through flanges at two ends, so that the windward side of the measuring piece is opposite to the air flow direction of the air supply pipeline;
2) respectively measuring the total pressure in the air supply pipeline through the total pressure average pipe holes of the two measuring sheets to obtain a total pressure average;
3) respectively measuring the static pressure in the air supply pipeline through static pressure average pipe holes of the two measuring sheets to obtain a static pressure average;
4) obtaining the air volume by the following formula (1), formula (2) and formula (3);
total mean-static mean = dynamic pressure (1)
Dynamic pressure =0.5 × air density (kg/m3) × wind speed (m/s) square (2)
Wind speed × wind volume shows the effective sectional area of the tuyere = wind volume (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010164387.XA CN111220216B (en) | 2020-03-11 | 2020-03-11 | Circular air volume and air pressure measuring valve and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010164387.XA CN111220216B (en) | 2020-03-11 | 2020-03-11 | Circular air volume and air pressure measuring valve and using method thereof |
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| CN111220216A true CN111220216A (en) | 2020-06-02 |
| CN111220216B CN111220216B (en) | 2024-08-30 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200169412Y1 (en) * | 1999-08-17 | 2000-02-15 | 삼공물산주식회사 | Device for measuring airflow rate |
| JP3615369B2 (en) * | 1997-10-16 | 2005-02-02 | ウエツトマスター株式会社 | Fluid pressure detector |
| CN201387344Y (en) * | 2009-03-16 | 2010-01-20 | 杭州浙大协和环保技术有限公司 | Air volume measuring device |
| CN201548557U (en) * | 2009-10-16 | 2010-08-11 | 吴江市华宇净化设备有限公司 | Wind speed wind and wind quantity measuring device |
| CN203981219U (en) * | 2014-07-30 | 2014-12-03 | 皇家空调设备工程(广东)有限公司 | Wing serial sampling air flow sensor for variable air volume system |
| CN206989990U (en) * | 2017-05-15 | 2018-02-09 | 广州奥松电子有限公司 | A kind of air flow sensor device of integrated temperature detection |
| CN211346910U (en) * | 2020-03-11 | 2020-08-25 | 修武县宏源冷暖设备有限公司 | Circular air quantity and air pressure measuring valve |
-
2020
- 2020-03-11 CN CN202010164387.XA patent/CN111220216B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3615369B2 (en) * | 1997-10-16 | 2005-02-02 | ウエツトマスター株式会社 | Fluid pressure detector |
| KR200169412Y1 (en) * | 1999-08-17 | 2000-02-15 | 삼공물산주식회사 | Device for measuring airflow rate |
| CN201387344Y (en) * | 2009-03-16 | 2010-01-20 | 杭州浙大协和环保技术有限公司 | Air volume measuring device |
| CN201548557U (en) * | 2009-10-16 | 2010-08-11 | 吴江市华宇净化设备有限公司 | Wind speed wind and wind quantity measuring device |
| CN203981219U (en) * | 2014-07-30 | 2014-12-03 | 皇家空调设备工程(广东)有限公司 | Wing serial sampling air flow sensor for variable air volume system |
| CN206989990U (en) * | 2017-05-15 | 2018-02-09 | 广州奥松电子有限公司 | A kind of air flow sensor device of integrated temperature detection |
| CN211346910U (en) * | 2020-03-11 | 2020-08-25 | 修武县宏源冷暖设备有限公司 | Circular air quantity and air pressure measuring valve |
Non-Patent Citations (2)
| Title |
|---|
| 匡立平, 任和娣: "风量与风压的简易测量及应用", 港工技术, no. 02, 30 June 2000 (2000-06-30), pages 28 - 30 * |
| 段泉圣;韩晓娟;: "矩形管道送风流量测量方法实验研究", 现代电力, no. 03, 30 June 2006 (2006-06-30), pages 57 - 60 * |
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