CN111174839A - Air quantity measuring device - Google Patents
Air quantity measuring device Download PDFInfo
- Publication number
- CN111174839A CN111174839A CN202010051646.8A CN202010051646A CN111174839A CN 111174839 A CN111174839 A CN 111174839A CN 202010051646 A CN202010051646 A CN 202010051646A CN 111174839 A CN111174839 A CN 111174839A
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- CN
- China
- Prior art keywords
- pressure pipe
- measuring device
- static pressure
- air volume
- volume measuring
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/46—Pitot tubes
Abstract
The invention provides an air volume measuring device, relates to the technical field of measurement, and solves the technical problems that an L-shaped air volume measuring device and an S-shaped air volume measuring device in the prior art adopt single-point pressure measurement, and the measurement results have large deviation. The air quantity measuring device comprises a total pressure pipe and a static pressure pipe; the total pressure pipe and the static pressure pipe are parallel to each other and are fixed in the air inlet pipeline or the box body; the full-pressure pipe is provided with at least two full-pressure measuring holes; the static pressure pipe is provided with at least two static pressure measuring holes; the full pressure measuring hole and the static pressure measuring hole are respectively opposite to the air flow and opposite to the air flow. According to the invention, the average pressure of the whole section can be obtained by multipoint pressure measurement and then average value calculation, so that the measurement of the wind speed and the wind volume is more accurate. Meanwhile, the total pressure pipe and the static pressure pipe can be independently designed, and can be processed and manufactured by directly using a standard pipe without a special die, and the wind volume measuring device has higher flexibility than the standard design of the existing wind volume measuring device.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to an air volume measuring device.
Background
In the variable air volume end device, the air volume measuring device is a core measuring element for accurately controlling the air volume, and the device is widely applied to the field of heating ventilation and air conditioning.
The principle of the air volume measuring device is that one is used for measuring full pressure and the other is used for measuring static pressure through two pressure measuring holes. The two holes are connected by a differential pressure meter, and the difference value of the two, namely dynamic pressure, can be obtained. The dynamic pressure has a square relation with the flow velocity, and the flow velocity is in direct proportion to the flow, so that the flow velocity and the flow are measured. The following relations are provided:
in the formula, Q represents flow, Δ p represents dynamic pressure (namely the difference between full pressure and static pressure measured by an air volume measuring device), F represents the cross-sectional area of the pipeline, u represents flow velocity, ρ represents air density, and α is a flow coefficient and is calibrated by experiments, wherein the cross-sectional area F of the pipeline and the air density ρ are known.
the method comprises the steps of firstly, ensuring that the obtained dynamic pressure p is stable and accurate and can represent the average flow velocity in a cross section area, adopting single-point pressure obtaining by the conventional L-shaped air volume measuring device and the conventional S-shaped air volume measuring device, and ensuring that the flow coefficient α is applicable to the air volume range as wide as possible because the flow velocities of all points of the cross section are inconsistent and the pressure obtained by the single point is not representative, and thirdly, producing the air conditioning equipment in batches, wherein the air volume measuring device is simple and convenient to produce, does not use special dies as far as possible and has good consistency of products in the same batch.
The applicant has found that the prior art has at least the following technical problems:
the existing L-shaped and S-shaped air volume measuring devices adopt single-point pressure measurement, and the measuring results have large deviation.
Disclosure of Invention
The invention aims to provide an air volume measuring device, which aims to solve the technical problems that the L-shaped air volume measuring device and the S-shaped air volume measuring device in the prior art adopt single-point pressure measurement, and the measuring results have large deviation. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides an air quantity measuring device, which comprises a total pressure pipe and a static pressure pipe; the total pressure pipe and the static pressure pipe are parallel to each other and are fixed in the air inlet pipeline or the box body; the full-pressure pipe is provided with at least two full-pressure measuring holes; the static pressure pipe is provided with at least two static pressure measuring holes; the full pressure measuring hole and the static pressure measuring hole are respectively opposite to the air flow and opposite to the air flow.
Optionally, the diameter of the full pressure measuring hole is 2mm, and the distance between two adjacent full pressure measuring holes is 54 mm.
Optionally, the diameter of each static pressure hole is 1.6mm, and the distance between two adjacent static pressure holes is 54 mm.
Optionally, the internal diameter of the total pressure pipe and the static pressure pipe is 5 mm.
Optionally, the material of the total pressure pipe and the static pressure pipe is B10, aluminum, stainless steel or red copper.
Optionally, the full pressure pipe, static pressure pipe is perpendicular to the side wall of the air inlet duct or box.
Optionally, the air volume measuring device further comprises a fixing bracket; the fixing support supports the total pressure pipe and the static pressure pipe.
Optionally, the fixing bracket is provided with a mounting hole, and the fixing bracket can be connected with the air inlet pipeline or the box body through a screw.
Optionally, the fixing support comprises a tail support and a middle support, and the tail support and the middle support the tail part and the middle part of the total-pressure pipe and the static-pressure pipe respectively; the tail support and the middle support are separated from each other.
Optionally, the tail support is riveted with the tail of the total-pressure pipe and the static-pressure pipe, and the total-pressure pipe and the static-pressure pipe are sealed through rivets.
Optionally, the middle support is sleeved with the total pressure pipe and the static pressure pipe.
Optionally, the head of the total pressure pipe and the static pressure pipe is L-shaped and is connected with a test hose.
Any technical scheme can at least produce the following technical effects:
according to the invention, the average pressure of the whole section can be obtained by multipoint pressure measurement and then average value calculation, the calculated wind speed represents the average wind speed of the whole section better than that of a single-point pressure measurement method, and the wind speed and the wind volume are measured more accurately. Meanwhile, the total pressure pipe and the static pressure pipe can be independently designed, standard pipes can be directly used for processing and manufacturing, special dies are not needed, the production is simple, the manufacturing is convenient, the cost is low, the consistency of products in the same batch can be guaranteed, the flexibility is higher than that of the standard design of the existing air volume measuring device, and the use requirements of various scenes can be met through different sizes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an L-shaped air volume measuring device in the prior art;
FIG. 2 is a schematic view of an air volume measuring device of the present invention;
FIG. 3 is a schematic view of the operation of the air volume measuring device of the present invention;
FIG. 4 is a schematic view of the measurement of the air quantity measuring device of the present invention;
fig. 5 is an installation schematic diagram of the air volume measuring device of the present invention.
FIG. 1 shows a full-pressure tube; 11. full pressure measurement; 2. a static pressure tube; 21. static pressure hole measurement; 3. fixing a bracket; 31. a tail support; 32. a middle support; 33. mounting holes; 34. riveting; 4. an air inlet pipeline; 5. and (4) a box body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention provides an air volume measuring device, which comprises a total pressure pipe 1 and a static pressure pipe 2, wherein the total pressure pipe 1 is used for measuring total pressure, the static pressure pipe 2 is used for measuring static pressure, and dynamic pressure delta p can be obtained by measuring corresponding total pressure value and static pressure value, so that a basis is provided for calculating flow Q and flow speed u. The total pressure pipe 1 and the static pressure pipe 2 are parallel to each other, so that the narrow space in the air inlet pipeline 4 or the box body 5 is prevented from being difficult to arrange due to mutual intersection, and the total pressure measuring holes 11 and the static pressure measuring holes 21 are convenient to be oppositely arranged, so that more accurate total pressure value and static pressure value are obtained. The total pressure pipe 1 and the static pressure pipe 2 are fixed in an air inlet pipeline 4 or a box body 5 (the box body 5 refers to a box body structure formed at the variable air volume tail end of an air conditioning system, and the variable air volume tail end is an important air volume measuring and adjusting device), so that the test is completed in an air duct of the air inlet pipeline 4 or the box body 5. The total pressure pipe 1 is provided with at least two total pressure measuring holes 11; the static pressure pipe 2 is provided with at least two static pressure measuring holes 21. As shown in fig. 4, the full pressure measurement hole 11 and the static pressure measurement hole 21 are respectively opposite to the air flow and opposite to the air flow, that is, the full pressure measurement hole 11 faces the wind, and the static pressure measurement hole 21 faces the wind. Preferably, the total pressure measuring holes 11 and the static pressure measuring holes 21 are equal in number and opposite in position, the average pressure of the whole section can be obtained by multi-point pressure measurement and then calculating the average value, and the calculated wind speed better represents the average wind speed of the whole section than a single-point pressure measurement method (as shown in fig. 3, the direction of an arrow is the direction of air flow, the flow speed of the air flow at different positions is different, the value of single-point pressure measurement is not representative, so that the accuracy is not high, and the average value calculation after multi-point pressure measurement is obviously more representative), so that the measurement of the wind speed and the wind volume is more accurate. Meanwhile, the total-pressure pipe 1 and the static pressure pipe 2 can be independently designed, standard pipes can be directly used for processing and manufacturing, special dies are not needed, the production is simple, the manufacturing is convenient, the cost is low, the consistency of products in the same batch can be guaranteed, the flexibility is higher than that of the standard design of the existing air volume measuring device, and the use requirements of various scenes can be met through different sizes.
In an alternative embodiment, the diameter of the full pressure measuring hole 11 is 2mm, the distance between two adjacent full pressure measuring holes 11 is 54mm, and the plurality of full pressure measuring holes 11 are uniformly distributed. The diameter of each static pressure measuring hole 21 is 1.6mm, the distance between every two adjacent static pressure measuring holes 21 is 54mm, and the static pressure measuring holes 21 are uniformly distributed. The inner diameters of the total pressure pipe 1 and the static pressure pipe 2 are both 5 mm. The size is convenient for the production and the manufacture of the total pressure pipe 1 and the static pressure pipe 2 and is also suitable for the use requirement of most air quantity measurement. The total pressure pipe 1 and the static pressure pipe 2 adopt pipes with standard sizes, and the bending and drilling processing can be carried out without a mould and a welding process which are required in the processing and manufacturing of the existing air volume measuring device, so that the production process is simpler, the measuring consistency can be ensured, and the manufacturing cost is also lower.
As an optional implementation mode, the materials of the total pressure pipe 1 and the static pressure pipe 2 are B10, aluminum, stainless steel or red copper, B10 is copper-based alloy taking nickel as a main additive element, the processing and the manufacturing are convenient, the corrosion resistance is good, and the device can be suitable for the working environment with high salt fog, such as marine environment of ships. The aluminum, stainless steel or red copper are convenient to process, are applied to air volume measurement scenes with low anti-corrosion requirements, and can also be applied to most air volume measurement scenes.
As an alternative embodiment, as shown in fig. 4-5, a part of two circles in fig. 5 is the installation position of the air volume measuring device of the present invention, and the direction of the arrow in the figure is the air flow direction. The total pressure pipe 1 and the static pressure pipe 2 are perpendicular to the side wall of the air inlet pipeline 4 or the box body 5, the total pressure measuring hole 11 is arranged right opposite to the airflow direction, so that the total pressure pipe 1 is perpendicular to the airflow direction, the static pressure pipe 2 is back to the airflow direction, and therefore the measured total pressure and the measured static pressure difference can be more accurate. The length of the total-pressure pipe 1 and the static pressure pipe 2 can be set according to the width of the air inlet pipeline 4 or the box body 5, the total-pressure pipe 1 and the static pressure pipe 2 are not standard products, the size can be set individually, the pipe can be directly processed, the specific size, particularly the length, can be set according to needs, the air duct size requirements of various measurement scenes can be met, and the applicability is improved.
As an alternative embodiment, as shown in fig. 2, the air volume measuring device further includes a fixing bracket 3; the fixed support 3 supports the full-pressure pipe 1 and the static pressure pipe 2. The fixing support 3 is provided with a mounting hole 33, the fixing support 3 can be connected with the air inlet pipeline 4 or the box body 5 through a screw, a hole matched with the mounting hole 33 is also formed in the corresponding position of the air inlet pipeline 4 or the box body 5, and the fixing support 3 can be connected with the inner wall of the air inlet pipeline 4 or the box body 5 through the screw. The screw connection is convenient, and the screw connection is convenient to detach, so that the measuring efficiency can be improved. The existing air volume measuring device is generally installed on an air inlet pipeline at the tail end of variable air volume, an external connecting pipe of the air inlet pipeline is installed by engineering, and due to space limitation, the length of a straight pipe section with the diameter being three times of the pipe diameter can not be guaranteed in engineering frequently, so that upstream air flow of the air volume measuring device is disordered, the measured pressure fluctuates ceaselessly, and accurate measurement and control cannot be achieved. According to the invention, through porous measurement, multipoint voltage measurement is used, then the average value is calculated, the length of a straight pipe section with the diameter being three times of the pipe diameter is not needed any more, the straight pipe section is not needed to be reserved in engineering, and the straight pipe section is installed in any airflow stabilizing section in the box body 5, so that the measurement of the air volume measuring device cannot be influenced when the air flow fluctuates, and the flexible arrangement of the installation position can be realized.
As an alternative embodiment, as shown in fig. 2, the fixing support 3 includes a tail support 31 and a middle support 32, and the tail support 31 and the middle support 32 support the tail and the middle of the total pressure pipe 1 and the static pressure pipe 2, respectively; the tail bracket 31 and the middle bracket 32 are separated from each other. The tail support 31 and the middle support 32 can ensure that the total pressure measuring hole 11 of the total pressure pipe 1 is opposite to the windward side, and the static pressure measuring hole 21 of the static pressure pipe 2 is opposite to the windward side, so that the accuracy of the measuring result and the overall structural strength are ensured. The tail support 31 is riveted with the tail parts of the total pressure pipe 1 and the static pressure pipe 2, and the total pressure pipe 1 and the static pressure pipe 2 are sealed through rivets 34. The middle support 32 is sleeved with the total-pressure pipe 1 and the static pressure pipe 2, a connecting hole matched with the total-pressure pipe 1 and the static pressure pipe 2 is formed in the middle support 32, and a gasket is preferably further arranged at the position of the connecting hole to improve the mutual sleeving strength. The cross sections of the tail support 31 and the middle support 32 are L-shaped, one side of the tail support is fixedly connected with the air inlet pipeline 4 or the box body 5 through screws, and the other side of the tail support is connected with the total pressure pipe 1 and the static pressure pipe 2. The connecting structure is convenient to install, high in overall strength, and suitable for severe environments with high vibration, high impact and inclined swinging, such as a ship air conditioner, improves the applicability, and has better use prospect along with more and more extensive application of a variable air volume end product. The head parts of the total pressure pipe 1 and the static pressure pipe 2 are L-shaped and are connected with a test hose, the connection mode is consistent with that of the existing L-shaped air volume measuring device, and the test hose can be sleeved in the total pressure pipe 1 and the static pressure pipe 2 and can also be fixed through gluing.
as an optional embodiment, the air volume measuring device provided by the present invention may also be used for flow rate tests of other fluids such as water, oil, etc., in which case, the opening sizes, the adjacent hole measuring distances, the channel inner diameters, and the flow rate coefficients α of the total pressure pipe 1 and the static pressure pipe 2 may be retested.
table 1 shows the test data obtained by the air volume measuring device of the present invention, when the proportionality coefficient K is 0.53 and the correction coefficient Q is-12, the pitot tube is installed in the air duct, and when the opening degree and the pressure difference of the air valve are different, the deviation between the measured air volume value and the actual air volume is within ± 5%, which satisfies the measurement requirement.
Table 1 test data of the air volume measuring device of the present invention
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (12)
1. An air volume measuring device is characterized by comprising a total pressure pipe and a static pressure pipe; the total pressure pipe and the static pressure pipe are parallel to each other and can be fixed in the air inlet pipeline or the box body; the full-pressure pipe is provided with at least two full-pressure measuring holes; the static pressure pipe is provided with at least two static pressure measuring holes; the full pressure measuring hole and the static pressure measuring hole are respectively opposite to the air flow and opposite to the air flow.
2. The air volume measuring device according to claim 1, wherein the diameter of the full pressure measuring hole is 2mm, and the distance between two adjacent full pressure measuring holes is 54 mm.
3. The air volume measuring device according to claim 1, wherein the diameter of each static pressure measuring hole is 1.6mm, and the distance between two adjacent static pressure measuring holes is 54 mm.
4. The air volume measuring device according to claim 1, wherein the total pressure pipe and the static pressure pipe each have an inner diameter of 5 mm.
5. The air volume measuring device according to claim 1, wherein the total pressure pipe and the static pressure pipe are made of B10, aluminum, stainless steel or red copper.
6. The air volume measuring device of claim 1, wherein the total pressure pipe and the static pressure pipe are perpendicular to the side wall of the air inlet pipeline or the box body.
7. The air volume measuring device according to any one of claims 1 to 6, further comprising a fixing bracket; the fixing support supports the total pressure pipe and the static pressure pipe.
8. The air volume measuring device according to claim 7, wherein the fixing bracket is provided with a mounting hole, and the fixing bracket can be connected with the air inlet duct or the box body through a screw.
9. The air volume measuring device according to claim 7, wherein the fixing bracket comprises a tail bracket and a middle bracket, and the tail bracket and the middle bracket respectively support the tail part and the middle part of the full-pressure pipe and the static pressure pipe; the tail support and the middle support are separated from each other.
10. The air volume measuring device according to claim 9, wherein the tail support is riveted to a tail of the full-pressure pipe and the static pressure pipe, and the full-pressure pipe and the static pressure pipe are sealed by rivets.
11. The air volume measuring device according to claim 9, wherein the middle support is sleeved with the total pressure pipe and the static pressure pipe.
12. The air volume measuring device according to claim 1, wherein the head of the total pressure pipe and the static pressure pipe is L-shaped and is connected with a test hose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010051646.8A CN111174839A (en) | 2020-01-17 | 2020-01-17 | Air quantity measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010051646.8A CN111174839A (en) | 2020-01-17 | 2020-01-17 | Air quantity measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN111174839A true CN111174839A (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010051646.8A Pending CN111174839A (en) | 2020-01-17 | 2020-01-17 | Air quantity measuring device |
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| CN (1) | CN111174839A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018467A (en) * | 2021-10-18 | 2022-02-08 | 珠海格力电器股份有限公司 | Voltage stabilizer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202350841U (en) * | 2011-09-30 | 2012-07-25 | 杭州哲达科技股份有限公司 | Verabar flow sensor with range adjustable function |
| 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 |
| CN205506130U (en) * | 2016-04-22 | 2016-08-24 | 南京友智科技有限公司 | Circular pipeline total cross -section flowmeter |
-
2020
- 2020-01-17 CN CN202010051646.8A patent/CN111174839A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202350841U (en) * | 2011-09-30 | 2012-07-25 | 杭州哲达科技股份有限公司 | Verabar flow sensor with range adjustable function |
| 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 |
| CN205506130U (en) * | 2016-04-22 | 2016-08-24 | 南京友智科技有限公司 | Circular pipeline total cross -section flowmeter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018467A (en) * | 2021-10-18 | 2022-02-08 | 珠海格力电器股份有限公司 | Voltage stabilizer |
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Application publication date: 20200519 |