JP2007071764A - Wind velocity measuring probe for air-conditioning facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wind velocity measuring probe for an air-conditioning facility capable of obtaining accurately an average wind velocity in the whole flow area of air, allowing simple constitution and inexpensive manufacturing, and allowing flexible coping-with while matched with a wideness of the flow area and a shape of an air flow passage. <P>SOLUTION: This wind velocity measuring probe is provided with the first connecting passage 1 and the second connecting passage 2 in parallel each other, has a plurality of openings 11, 11 for connection on a side face in the each connecting passage opposite to the other connecting passage, and obtains a wind velocity of the air flowing in a measured air flow passage, based on a pressure difference between the first and second connecting passages installed in the measured air flow passage in the air-conditioning facility. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a probe for measuring the wind speed of air in an air circulation part such as an air outlet or a duct of a heat exchanger in an air conditioning facility.

  In the construction and maintenance of air-conditioning equipment, it is necessary to accurately grasp the value of the wind speed (air volume) in the air circulation section, and as a means for measuring the wind speed, that is, the gas flow velocity, a differential pressure type, thermal type, blade There are various types such as car type and ultrasonic type.

In the measurement of the wind speed, it is necessary to perform multipoint measurement in principle for the entire cross-sectional area of the air flow except when a special device such as a duct for measurement is used (for example, refer to Patent Document 1). In some cases, a large number of measurement sensors must be installed in the air flow path, or an operator must enter the air flow path to perform measurement. In the former case, a large number of expensive sensors are required. There is a problem in that the arrangement takes time and costs increase. In the latter case, there is a risk that the worker may be in danger, and if the worker enters the air flow path, the measurement accuracy may be adversely affected.
Japanese Patent Application Laid-Open No. 6-147743 (pages 1-8, FIGS. 1-7)

  The present invention makes it possible to accurately grasp the average air volume over the entire air circulation area, and can be manufactured at a low cost with a simple configuration. An object of the present invention is to provide a probe for measuring wind speed for air conditioning equipment that can flexibly cope with the above.

  In order to solve the above-described problems, a probe according to the present invention includes a first pressure guiding path and a second pressure guiding path that are parallel to each other, and is opposite to the other pressure guiding paths in each pressure guiding path. A wind speed of air flowing through the measured air flow path from a pressure difference between the first and second pressure guiding paths, which has a plurality of pressure guiding openings on the side surface and is installed in the measured air flow path in the air conditioning equipment It is the thing of the structure which was made to be obtained.

  Further, each of the first and second pressure guiding paths is constituted by a plurality of pipes, and these pipes are freely combined to close the open end.

  Further, each of the first and second pressure guiding paths is provided in plural, and the other end of the pressure guiding tube having one end connected to the first pressure guiding path is connected to the first chamber, and one end is connected to the second pressure guiding path. The other end of the pressure guiding tube connected to the second chamber is connected to the second chamber, and the respective average pressures of the first pressure guiding path and the second pressure guiding path reach each chamber. is there.

  Of the first and second pressure guiding paths, the axial direction is the same as the opening around the opening of the pressure guiding path disposed on the upstream side of the measured air flow path, and the inner diameter is larger than the diameter of the opening. Also, a large cylindrical guide is provided.

  According to the present invention, basically, the total pressure that is the sum of the dynamic pressure and the static pressure of the air to be measured is introduced into the pressure guiding path from the opening in the one pressure guiding path facing the upstream side of the air flow path to be measured. As a result, the static pressure of the air to be measured is applied from the opening in the other pressure guiding path facing the downstream side into the pressure guiding path.

  Since the difference between the pressure in one pressure guide path and the pressure in the other pressure guide path changes corresponding to the pressure of the air to be measured, an appropriate differential pressure measuring device can be used. The dynamic pressure of air in the measurement air flow path can be obtained, and the wind speed of air can be obtained from this dynamic pressure.

  Thus, in the measured air flow path, the air flow is not uniform in the flow cross section, and there is a case where the air flows backward, but a plurality of openings are provided in the first and second pressure guiding paths, respectively. Therefore, even if there is an error in the average pressure, this error affects the first and second pressure guiding paths almost equally. By obtaining the wind speed from the differential pressure between the first pressure guide path and the second pressure guide path, the error is canceled out and accurate wind speed measurement can be expected.

  Moreover, during the measurement, the probe can be fixed inside the air flow path, and the measurement work can be performed outside the air flow path via a pressure guiding tube that guides the pressure in the pressure guiding path of the probe. Does not need to enter the air flow path during measurement, and can perform measurement work safely and eliminate the disturbance of air flow caused by workers entering the air flow path. Can be improved.

In addition, in the case where the pressure guiding path is composed of a plurality of pipes, various types of pipes can be combined in accordance with the cross-sectional shape of the air flow path to be measured, by combining various types of long and short pipes that have been previously opened for pressure guiding. It can respond flexibly so that the wind speed of the whole flow path can be obtained according to the environment.
In addition, a general-purpose product such as a synthetic resin pipe can be used as the pipe, and it can be manufactured at a low cost because it has high workability and is inexpensive.

  Further, in the case where the cylindrical guide is provided around the opening of the pressure guiding path disposed on the upstream side, the pressure in the upstream pressure guiding path can be increased, and therefore this upstream pressure guiding path. And the downstream pressure guiding path can be increased, and the measurement accuracy can be improved particularly in the case of a small air volume.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a wind speed measuring probe for air conditioning equipment according to the present invention will be described in detail below based on specific examples shown in the accompanying drawings.
The upstream side tubular body 3 and the downstream side tubular body 4 constituting the first pressure guiding path 1 and the second pressure guiding path 2, respectively, have a structure in which the secondary tubular bodies 7 and 8 are attached to the main tubular bodies 5 and 6, respectively. The main pipe and the sub pipe are made of, for example, a pipe made of vinyl chloride having a nominal diameter of about 16 mm, and are connected to each other by T-shaped joints 9 and 9, and the open end is the end. It is closed with caps 10 and 10.

  Each main tube and sub tube are provided with openings 11 and 11 communicating with the inside, and the opening of the upstream tube 3 and the opening of the downstream tube 4 are provided in opposite directions. The diameter of each opening is, for example, about 5 mm.

  A cylindrical guide 12 is provided around each opening in the upstream tube 3, and the inner diameter of the guide is, for example, twice the diameter of the opening, that is, about 10 mm. The pressure applied in the pressure guiding path 1 is increased to increase the difference from the pressure in the second pressure guiding path 2.

  Then, at appropriate positions of the pipe bodies 3 and 4, one ends of the first and second pressure guiding tubes 13 and 14 for leading the pressure in the first and second pressure guiding paths 1 and 2 to the outside are provided. Each tube is connected, and each tube is attached to, for example, a connection port 15 provided in one of the end caps 10 and 10.

The other end of the tube described above is connected to a differential pressure gauge 16, and the differential pressure gauge outputs the difference between the pressure in the first pressure guide path 1 and the pressure in the second pressure guide path 2 as a differential pressure signal. As a thing.
Since there are various types of differential pressure gauges in the past, detailed description is omitted.

  This differential pressure signal is composed of, for example, a current value, and is sent to a computing device 18 such as a computer via the signal line 17, where appropriate computation and correction are performed by the computing device to output the wind speed.

In the above calculation and correction, for example, as shown in FIG. 3, a current-wind speed conversion equation is obtained based on the relationship between the differential pressure signal (current value) obtained in advance by experiments and the actual air volume (measured value). The calculation value is obtained by the conversion equation and output as the wind speed.
Specifically, in the case of the relationship shown in FIG. 3, the relationship between the wind speed y and the current value x is y = 0.0022x ⁴ + 0.0809x ³ −1.1505x ² + 7.7996x−17.358
It can be expressed by a current-wind speed conversion formula.

  The upstream side tubular body 3 and the downstream side tubular body 4 configured as described above always constitute a pair of probes, and this probe increases or decreases the number of secondary tubular bodies according to the cross-sectional area and shape of the air flow path to be measured. In some cases, a plurality of probes configured as described above may be used.

  When a plurality of probes are used, each inlet 21 provided with the first pressure guiding tube 13 and the second pressure guiding tube 14 from each probe in the first chamber 19 and the second chamber 20, respectively. , 21 and pressure guiding tubes 23, 24 connected to the outlet 22 of each chamber are connected to the differential pressure gauge 16.

  Each of the chambers 19 and 20 can be manufactured at low cost by using a chamber cylindrical body 25 made of, for example, a pipe made of vinyl chloride having a nominal diameter of about 25 mm and closed at both ends by end caps 26 and 26. .

The perspective view which shows the Example of the probe which concerns on this invention. II-II sectional view taken on the line of FIG. The graph which shows correlation with a differential pressure signal (electric current value) and a wind speed. The partially broken front view which shows an example of a chamber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st pressure induction path 2 2nd pressure induction path 3 Upstream side pipe body 4 Downstream side pipe body 5, 6 Main pipe body 7, 8 Sub pipe body 9 Joint 10 End cap 11 Opening 12 Guide 13 1st pressure induction Tube 14 Second pressure guiding tube 15 Connection port 16 Differential pressure gauge 17 Signal line 18 Computing device 19 First chamber 20 Second chamber 21 Chamber inlet 22 Chamber outlet 23, 24 Pressure guiding tube 25 Cylindrical body 26 End cap

Claims (4)

  A first pressure guiding path and a second pressure guiding path that are parallel to each other are provided, and each of the pressure guiding paths has a plurality of openings for guiding pressure on the side surface opposite to the other pressure guiding paths. Wind speed measurement for an air conditioner configured to obtain a wind speed of air flowing through the measured air flow path from a pressure difference between the first and second pressure guiding paths installed in the measured air flow path Probe.   The probe for measuring wind speed according to claim 1, wherein each of the first and second pressure guiding paths is constituted by a plurality of pipes, and these pipes are freely combined to close an open end.   A plurality of the first and second pressure guiding paths, each having one end connected to the first pressure guiding path, the other end of the pressure guiding tube connected to the first chamber, and one end connected to the second pressure guiding path The other end of each of the pressure guiding tubes is connected to the second chamber, and the respective average pressures of the first pressure guiding path and the second pressure guiding path reach each chamber. A probe for measuring wind speed for the air conditioning equipment according to 1 or 2.   Of the first and second pressure guiding paths, the axial direction is the same as the opening around the opening of the pressure guiding path disposed on the upstream side of the measured air flow path, and the inner diameter is larger than the diameter of the opening. The probe for wind speed measurement for air-conditioning equipment of Claim 1 provided with the cylindrical guide which becomes.

Images