JP2019152589A - Flow rate measuring device and environmental testing device - Google Patents

Abstract

To provide a flow rate measuring device which can continuously measure a flow rate, and an environmental testing device having the same.SOLUTION: The present invention includes: a first pressure pipe 24 having a measurement hole 24a, on which the total pressure is applied; a second pressure pipe 25 having a measurement hole 25a, on which a static pressure is applied; and an air compressor 6 for sending compressed air; and electromagnetic valve 61a, 62a, and 63a for switching a situation in which the compressed air sent from the air compressor 6 is supplied to the first pressure pipe 24 and the second pressure pipe 25 and a situation in which the compressed air is not supplied thereto.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a Pitot tube type wind speed measuring device and an environmental test apparatus including the same.

  In general, an environmental test apparatus that performs an environmental test by changing temperature, humidity, or the like in a test chamber in which a device under test is arranged is known. Patent Document 1 discloses an environmental test apparatus as described above that includes an anemometer for measuring the wind speed in a test chamber.

JP 2011-022015 A

  The wind speed measuring machine for measuring the wind speed in the test chamber in the environmental test apparatus as described above is desired to be able to measure the wind speed accurately and stably in a wide temperature range and humidity range. From such a viewpoint, it is preferable to employ a pitot tube type wind speed measuring device.

  However, when a Pitot tube-type wind speed measuring device is used and an environmental test is performed to control the humidity below the freezing point, frost or supercooled water floating in the air can hit the Pitot tube and form frost on the Pitot tube. There is sex. Due to this frost, the pressure detection measurement hole of the Pitot tube is blocked with time, and a large error may occur in the wind speed measurement, which may make measurement impossible.

  An object of the present invention is to provide a wind speed measuring machine capable of continuously measuring wind speed and an environmental test apparatus including the same.

  The wind speed measuring device according to the present invention is a Pitot tube type wind speed measuring device, and includes a first pressure tube in which a first measurement hole to which total pressure is applied and a second measurement hole to which static pressure is applied. 2 pressure pipes, and gas supply means for supplying compressed gas to the first pressure pipe and the second pressure pipe.

  According to this structure, the frost adhering to the 1st measurement hole and the 2nd measurement hole can be blown off by supplying compressed gas to a 1st pressure pipe and a 2nd pressure pipe by a gas supply means. Therefore, it is possible to suppress the first measurement hole and the second measurement hole from being blocked by frost. Therefore, the wind speed can be measured continuously.

  Further, the wind speed measuring device of the present invention further includes supply control means for controlling the gas supply means, and the supply control means periodically supplies compressed gas to the first pressure pipe and the second pressure pipe. It is preferable to control the gas supply means to be supplied.

  According to this structure, the frost adhering to a 1st measurement hole and a 2nd measurement hole can be blown off regularly. Therefore, it can suppress reliably that the 1st measurement hole and the 2nd measurement hole are plugged up with frost.

  In addition, in the wind speed measuring machine of the present invention, the compressed gas supplied by the gas supply means is preferably air having a dew point temperature equal to or lower than the dew point temperature of the measurement air.

  According to this structure, it can suppress that frost is attached with the compressed gas which the gas supply means supplied.

  Moreover, in the wind speed measuring device of this invention, it is preferable that the temperature of the compressed gas supplied by the said gas supply means is less than 0 degree | times.

  When the temperature of the compressed gas is 0 ° C. or more, the frost adhering to the first pressure pipe and the second pressure pipe is thawed and flows on the surfaces of the first pressure pipe and the second pressure pipe, so that another place There is a risk of re-freezing. In the configuration of the present invention described above, since the temperature of the compressed gas is less than 0 degrees, it is possible to blow off the frost adhering to the first pressure pipe and the second pressure pipe without melting.

  Further, in the wind speed measuring machine according to the present invention, the two single connection pressure guiding pipes connected to the first pressure pipe and the second pressure pipe, respectively, and both the first pressure pipe and the second pressure pipe are connected. A pressure gauge connected to at least one of the two single connection pressure pipes and at least one of the two single connection pressure pipes, and the gas supply means includes the 2 The compressed gas may be supplied to the first pressure pipe and the second pressure pipe via at least one of the single connection pressure pipe and the one double connection pressure pipe.

  According to this configuration, the configuration of the wind speed measuring device can be simplified by supplying the compressed gas using the pressure guiding tube connected to the pressure gauge.

  In addition, in the wind speed measuring machine according to the present invention, between at least one of the two single-connection pressure guide tubes and the one double-connection pressure guide tube, the compressed gas is supplied and the corresponding pressure gauge, respectively. And a valve control means for controlling the on-off valve. The valve control means closes the on-off valve when compressed gas is supplied by the gas supply means. It is preferable.

  According to this configuration, the measurement by the pressure gauge can be prevented from being affected by the compressed gas supplied by the gas supply means.

  The wind speed measuring machine of the present invention further includes output means for outputting the pressure measured by the pressure gauge, and the output means is compressed while compressed gas is supplied by the gas supply means. It is preferable to output the pressure measured by the pressure gauge before the gas is supplied.

  According to this configuration, the pressure can be continuously output while the compressed gas is supplied by the gas supply means.

  An environmental test apparatus according to the present invention includes any one of the above-described wind speed measuring machines, a test chamber in which a test object is disposed, and an air conditioner that adjusts at least one of temperature and humidity in the test chamber, The wind speed measuring device measures the wind speed in the test chamber.

  According to this configuration, the wind speed in the test chamber can be continuously measured by the wind speed measuring machine.

  As described in the above description, according to the present invention, frost adhered to the first measurement hole and the second measurement hole by supplying the compressed gas to the first pressure pipe and the second pressure pipe by the gas supply means. Can be blown away. Therefore, it is possible to suppress the first measurement hole and the second measurement hole from being blocked by frost. Therefore, the wind speed measuring machine which can measure a wind speed continuously can be provided.

It is a figure which shows schematic structure of the environmental test apparatus with which the wind speed measuring device concerning embodiment of this invention is provided. It is a figure which shows schematic structure of the wind tunnel and wind speed measuring machine which are arrange | positioned at the environmental test apparatus shown in FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. It is a flowchart which shows an example of the process sequence regarding a wind speed measurement.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Configuration of Environmental Test Apparatus 100]
First, the configuration of an environmental test apparatus 100 provided with the wind speed measuring device 1 according to an embodiment of the present invention will be described with reference to FIGS. The environmental test apparatus 100 performs a test for changing the atmospheric state of the DUT 10 according to a predetermined condition.

  As shown in FIG. 1, a partition wall 38 that extends vertically is provided inside a test chamber 3 that is a casing having a substantially rectangular shape of the environmental test apparatus 100. The space in the test chamber 3 is partitioned into a test chamber 4 and an air conditioning chamber 5 by a partition wall 38. An upper hole 38 a is formed between the upper wall of the test tank 3 and the partition wall 38, and a lower hole 38 b is formed between the lower wall of the test tank 3 and the partition wall 38. Therefore, the test chamber 4 and the air conditioning chamber 5 communicate with each other via the upper hole 38a and the lower hole 38b. A display 8 for displaying information to the operator is provided outside the test tank 3.

  The test chamber 4 is a space for installing the device under test 10 and conducting a test. The air conditioning chamber 5 accommodates a blower 51, a humidifier 52, a heater 53, and a refrigerator 54 of a refrigerator. The humidifier 52 humidifies the air in the air conditioning chamber 5, and is composed of, for example, an ultrasonic humidifier. The humidifier may be a type that humidifies by heating the water in the container with a built-in heater, and may be placed under the cooler 54 of the refrigerator. The heater 53 heats the air in the air conditioning chamber 5 and is composed of an electric heater such as a sheathed heater, for example. The cooler 54 of the refrigerator cools or dehumidifies the air in the air-conditioning chamber 5, and includes, for example, a cooler using a vapor compression refrigerator, a Peltier element, a Stirling cooler, a heat pipe, a heat lane, and the like. It may be.

  The temperature and humidity of the air flowing into the air conditioning chamber 5 from the test chamber 4 through the lower hole 38 b are adjusted by the cooler 54, the heater 53, and the humidifier 52 in sequence. The air having a predetermined temperature and humidity flows again into the test chamber 4 through the upper hole 38a by the blower 51. In the vicinity of the upper hole 38a in the test chamber 4, a temperature / humidity sensor 41 capable of detecting temperature and humidity is disposed. Therefore, the temperature and humidity of the air sent to the test chamber 4 by the blower 51 can be detected. The air in the air conditioning chamber 5 is sent out to the test chamber 4 by the blower 51, so that the air in the test chamber 4 flows into the air conditioning chamber 5 through the lower hole 38b. Thus, air circulates between the test chamber 4 and the air conditioning chamber 5.

  The test chamber 4 is provided with a substantially cylindrical wind tunnel 2 to which the DUT 10 is attached at one end thereof (the right end in FIG. 1). The DUT 10 is, for example, an automobile radiator. As shown in FIG. 2, a lath net 21 is attached to the end of the wind tunnel 2 opposite to the side on which the DUT 10 is attached (the left end in FIG. 2). In the wind tunnel 2, the blower 22, the rectifying plate 23, the first pressure pipe 24, and the second pressure pipe are sequentially arranged from the end (the left end in FIG. 2) on the side where the lath net 21 is attached. 25 is arranged. The first pressure pipe 24 and the second pressure pipe 25 constitute the wind speed measuring machine 1.

  The blower 22 sucks air on the side opposite to the side to which the DUT 10 of the wind tunnel 2 is attached (left side in FIG. 2), and sends out air toward the DUT 10. That is, an air flow from the left side to the right side in FIG. 2 is generated inside the wind tunnel 2 by the blower 22. The rectifying plate 23 is configured by a plate having a surface parallel to the axial direction of the wind tunnel 2. As shown in FIG. 3, the rectifying plate 23 has an X shape when viewed from the axial direction of the wind tunnel 2.

[Configuration of wind speed measuring machine 1]
The wind speed measuring machine 1 measures the wind speed in the wind tunnel 2 arranged in the test chamber 4. The wind speed measuring device 1 is a Pitot tube type and includes a first pressure tube 24 and a second pressure tube 25. As shown in FIG. 2, the first pressure tube 24 extends in the vertical direction in the wind tunnel 2, and a plurality of measurement holes 24 a arranged in the vertical direction are formed. The measurement hole 24a is formed in the left part in FIG. That is, when an air flow is generated in the wind tunnel 2 by the blower 22, the total pressure is applied to the measurement hole 24a. The second pressure pipe 25 extends in the vertical direction in the wind tunnel 2 and has a plurality of measurement holes 25a arranged in the vertical direction. The measurement hole 25a is formed in the right part in FIG. That is, when an air flow is generated in the wind tunnel 2 by the blower 22, static pressure is applied to the measurement hole 25a.

  As shown in FIG. 2, the wind speed measuring machine 1 further includes a first pressure gauge 31, a second pressure gauge 32, and a third pressure gauge 33. The first pressure gauge 31 is connected to the first pressure pipe 24 in which the measurement hole 24a to which the total pressure is applied is formed via the first pressure guide pipe 35. Therefore, the first pressure gauge 31 can measure the total pressure. The second pressure gauge 32 is connected via a second pressure guiding pipe 36 to the second pressure pipe 25 in which a measurement hole 25a to which a static pressure is applied is formed. Therefore, the second pressure gauge 32 can measure the static pressure. The third pressure gauge 33 is a differential pressure gauge, and is connected to a third pressure guiding pipe 37 that connects the first pressure pipe 24 and the second pressure pipe 25. The third pressure gauge 33 can measure the dynamic pressure from the difference between the pressure (total pressure) of the first pressure guiding pipe 35 and the pressure (static pressure) of the second pressure guiding pipe 36.

  In this embodiment, in order to correct the measurement error, the dynamic pressure measured by the third pressure gauge 33, the total pressure measured by the first pressure gauge 31, and the static pressure measured by the second pressure gauge 32 are used. Two types of dynamic pressures, ie, a dynamic pressure calculated from the pressure, are acquired. If such error correction is not taken into consideration, only two of the first pressure gauge 31 and the second pressure gauge 32 or only the third pressure gauge 33 may be provided.

  As shown in FIG. 2, the wind speed measuring device 1 further includes an air compressor 6. A first pipe 61, a second pipe 62, and a third pipe 63 extend from the air compressor 6. The first pipe 61 is connected to the first pressure guiding pipe 35. The first pipe 61 is provided with an electromagnetic valve 61 a that switches between a state in which the air compressor 6 and the first pressure guiding pipe 35 are communicated with each other and a state in which the air compressor 6 and the first pressure guiding pipe 35 are not in communication. Therefore, the compressed air sent from the air compressor 6 is first communicated through the first pipe 61 and the first pressure guiding pipe 35 by communicating the air compressor 6 and the first pressure guiding pipe 35 with the electromagnetic valve 61a opened. The pressure tube 24 can be supplied.

  The second pipe 62 is connected to the second pressure guiding pipe 36. The second pipe 62 is provided with an electromagnetic valve 62a that switches between a state in which the air compressor 6 and the second pressure guiding pipe 36 are communicated with each other and a state in which the air compressor 6 and the second pressure guiding pipe 36 are not in communication. Accordingly, the electromagnetic valve 62 a is opened and communicated with the air compressor 6 and the second pressure guiding pipe 36, whereby the compressed air sent from the air compressor 6 is supplied to the second pressure via the second pipe 62 and the second pressure guiding pipe 36. The tube 25 can be supplied.

  The third pipe 63 is connected between the first pressure pipe 24 and the third pressure gauge 33 in the third pressure guiding pipe 37. Note that the third pipe 63 may be connected between the second pressure pipe 25 and the third pressure gauge 33 in the third pressure guiding pipe 37. The third pipe 63 is provided with an electromagnetic valve 63a that switches between a state in which the air compressor 6 and the third pressure guiding pipe 37 are communicated with each other and a state in which the air compressor 6 and the third pressure guiding pipe 37 are not in communication. Accordingly, the electromagnetic valve 63 a is opened and communicated with the air compressor 6 and the third pressure guiding pipe 37, so that the compressed air sent from the air compressor 6 is supplied to the first pressure via the third pipe 63 and the third pressure guiding pipe 37. The tube 24 and the second pressure tube 25 can be supplied.

  That is, the air compressor 6 and the electromagnetic valves 61a, 62a, 63a function as the “gas supply means” of the present invention. In the following description, the electromagnetic valves 61a, 62a, and 63a may be referred to as “compressor-side electromagnetic valves 61a, 62a, and 63a”.

  An electromagnetic valve 35 a is provided between the first pressure gauge 31 and a portion of the first pressure guiding pipe 35 where the first pipe 61 is connected. An electromagnetic valve 36 a is provided between the second pressure gauge 36 and a portion where the second pipe 62 is connected to the second pressure gauge 32. An electromagnetic valve 37 a is provided between a portion of the third pressure guiding pipe 37 where the third pipe 63 is connected and the third pressure gauge 33. The electromagnetic valves 35a, 36a, and 37a are for switching between a state in which the flow path is in communication and a state in which the flow path is not in communication.

  Therefore, by closing the electromagnetic valve 35 a and closing the flow path, the compressed air sent from the air compressor 6 and flowing into the first pressure guiding pipe 35 can be prevented from flowing into the first pressure gauge 31. Further, by closing the electromagnetic valve 36a and shutting off the flow path, the compressed air sent from the air compressor 6 and flowing into the second pressure guiding pipe 36 can be prevented from flowing into the second pressure gauge 32. Furthermore, the electromagnetic valve 37 a is closed to shut off the flow path, so that the compressed air sent from the air compressor 6 and flowing into the third pressure guiding pipe 37 can be prevented from flowing into the third pressure gauge 33. In the following description, the electromagnetic valves 35a, 36a, and 37a may be referred to as “pressure gauge side electromagnetic valves 35a, 36a, and 37a”.

  Although not shown, the wind speed measuring device 1 is provided with a dehumidifier (not shown) for dehumidifying the air sucked into the air compressor 6. Therefore, the humidity of the compressed air supplied from the air compressor 6 to the first pressure pipe 24 and the second pressure pipe 25 is equal to or lower than the humidity of the measurement air (air in the test chamber 4). Therefore, the compressed air supplied from the air compressor 6 to the first pressure pipe 24 and the second pressure pipe 25 has a dew point temperature equal to or lower than the dew point temperature of the measurement air (air in the test chamber 4). Further, the wind speed measuring device 1 includes a cooler (not shown) for cooling the air sucked into the air compressor 6. Thereby, the temperature of the compressed air supplied from the air compressor 6 to the first pressure pipe 24 and the second pressure pipe 25 can be made less than 0 degrees.

[Configuration of controller 9]
The environmental test apparatus 100 further includes a controller 9 (see FIG. 1). The controller 9 includes a blower 51, a humidifier 52, a heater 53, and a cooler 54 housed in the air-conditioning chamber 5, a blower 22 disposed in the wind tunnel 2, and the first wind speed measuring device 1. 1 to 3rd pressure gauges 31, 32, 33, pressure gauge side solenoid valves 35a, 36a, 37a, compressor side solenoid valves 61a, 62a, 63a and display 8 are electrically connected. It is something to control. The controller 9 is composed of a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. Means "," valve control means ", and" output means ".

  The controller 9 controls the compressor-side solenoid valves 61a, 62a, and 63a so that the compressed air sent from the air compressor 6 is periodically supplied to the first pressure pipe 24 and the second pressure pipe 25. Specifically, when the elapsed time since the supply of compressed air to the first pressure pipe 24 and the second pressure pipe 25 last time reaches a predetermined time, the electromagnetic valves 61a, 62a, 63a are opened from the closed state. Switch to. That is, the controller 9 functions as a “supply control unit” of the present invention. As for the interval for supplying compressed air, a frosted state at a temperature and humidity where frost is most likely to be confirmed is confirmed, and a time interval that does not hinder wind speed measurement is set. The supply of compressed air to the first pressure pipe 24 and the second pressure pipe 25 is for a few seconds. Therefore, the solenoid valves 61a, 62a, and 63a are switched from the closed state to the open state, and after a few seconds, are switched from the open state to the closed state.

  Further, the controller 9 switches the pressure gauge side electromagnetic valves 35a, 36a, and 37a from the open state to the closed state when supplying compressed air to the first pressure pipe 24 and the second pressure pipe 25. And after supply of the compressed air to the 1st pressure pipe 24 and the 2nd pressure pipe 25 is complete | finished, the pressure gauge side electromagnetic valve 35a, 36a, 37a is switched from a closed state to an open state. That is, the controller 9 functions as the “valve control means” of the present invention.

  In addition, the controller 9 outputs the pressure measured by the first pressure gauge 31, the second pressure gauge 32, and the third pressure gauge 33 and displays the pressure on the display 8. When compressed air is not supplied to the first pressure pipe 24 and the second pressure pipe 25, the pressures measured by the first to third pressure gauges 31, 32 and 33 are sequentially displayed on the display 8. And while compressed air is supplied to the 1st pressure pipe 24 and the 2nd pressure pipe 25, the 1st-1st immediately before supply of the compressed air to the 1st pressure pipe 24 and the 2nd pressure pipe 25 is started. The pressure measured by the third pressure gauges 31, 32 and 33 is displayed on the display 8. That is, the controller 9 functions as an “output unit” of the present invention.

  Here, an example of a processing procedure related to wind speed measurement performed by the controller 9 will be described with reference to FIG. Such processing is performed while the test is being performed by the environmental test apparatus 100.

  First, the pressure measured by the first to third pressure gauges 31, 32, 33 is output and displayed on the display 8 (S1). Subsequently, it is determined whether or not an elapsed time after supplying compressed air to the first pressure pipe 24 and the second pressure pipe 25 last time has reached a predetermined time (S2). If it is determined that the elapsed time has not reached the predetermined time (S2: NO), the process returns to S1. On the other hand, when it is determined that the elapsed time has reached the predetermined time (S2: YES), the pressure gauge side electromagnetic valves 35a, 36a, 37a are switched from the open state to the closed state (S3).

  By switching the pressure gauge side solenoid valves 35a, 36a, and 37a from the open state to the closed state in S3, the first to third pressure gauges 31, 32, and 33 cannot measure the pressure. Therefore, after the pressure gauge side solenoid valves 35a, 36a, 37a are switched from the open state to the closed state, the first to third pressures immediately before the pressure gauge side solenoid valves 35a, 36a, 37a are switched from the open state to the closed state. The pressure measured by the total 31, 32, 33 is output and displayed on the display 8 (S4).

  Next, the compressor side solenoid valves 61a, 62a, 63a are switched from the closed state to the open state (S5). As a result, the compressed air sent from the air compressor 6 is supplied to the first pressure pipe 24 and the second pressure pipe 25. Then, after supplying compressed air to the first pressure pipe 24 and the second pressure pipe 25 for several seconds, the compressor side electromagnetic valves 61a, 62a, 63a are switched from the open state to the closed state (S6). Further, the pressure gauge side solenoid valves 35a, 36a, 37a are switched from the closed state to the open state (S7). Thereby, it becomes possible to measure the pressure with the first to third pressure gauges 31, 32, 33 again. Thereafter, the process returns to S1.

  As described above, the wind speed measuring machine 1 of the present embodiment includes the test chamber 4 in which the DUT 10 is disposed, and the humidifier 52 that is an air conditioner for adjusting the temperature and humidity in the test chamber 4. In the environmental test apparatus 100 including the heater 53 and the refrigerator cooler 54, the Pitot tube type wind speed measuring machine measures the wind speed in the test chamber 4. The wind speed measuring machine 1 includes a first pressure pipe 24 having a measurement hole 24a to which a total pressure is applied, a second pressure pipe 25 having a measurement hole 25a to which a static pressure is applied, and an air compressor 6 for sending compressed air. And electromagnetic valves 61a, 62a, 63a that can switch between a state in which compressed air sent from the air compressor 6 is supplied to the first pressure pipe 24 and the second pressure pipe 25 and a state in which the compressed air is not supplied. Therefore, frost adhering to the measurement hole 24a and the measurement hole 25a by switching the solenoid valves 61a, 62a, 63a and supplying the compressed air sent by the air compressor 6 to the first pressure pipe 24 and the second pressure pipe 25. Can be blown away. Therefore, it can suppress that the measurement hole 24a and the measurement hole 25a are plugged up with frost. Thereby, the wind speed in the test chamber 4 of the environmental test apparatus 100 can be continuously measured.

  Further, in the wind speed measuring machine 1 of the present embodiment, the controller 9 uses the solenoid valve 61a, so that the compressed air sent from the air compressor 6 is periodically supplied to the first pressure pipe 24 and the second pressure pipe 25. 62a and 63a are controlled. Therefore, it is possible to periodically blow off the frost attached to the measurement hole 24a and the measurement hole 25a. Therefore, it can suppress that the measurement hole 24a and the measurement hole 25a are plugged up with frost.

  Furthermore, in the wind speed measuring machine 1 of this embodiment, the compressed air supplied to the 1st pressure pipe 24 and the 2nd pressure pipe 25 is air whose dew point temperature is below the dew point temperature of measurement air. Therefore, it is possible to suppress frost from being generated by the supplied compressed air.

  In addition, in the wind speed measuring machine 1 of this embodiment, the temperature of the compressed air supplied to the 1st pressure pipe 24 and the 2nd pressure pipe 25 is less than 0 degree. When the temperature of the compressed air is 0 ° C. or more, the frost attached to the first pressure pipe 24 and the second pressure pipe 25 is melted and flows on the surfaces of the first pressure pipe 24 and the second pressure pipe 25. There is a risk of re-freezing at another location. However, in this embodiment, since the temperature of compressed air is less than 0 degree, it can blow off without melting the frost adhering to the 1st pressure pipe 24 and the 2nd pressure pipe 25. FIG.

  Further, in the wind speed measuring machine 1 of the present embodiment, the first pressure pipe 35 connected to the first pressure pipe 24, the second pressure pipe 36 connected to the second pressure pipe 25, and the first pressure pipe 24 and the first pressure pipe 24. A third pressure guiding pipe 37 connected to both of the two pressure pipes 25; and first to third pressure gauges 31, 32, 33 connected to the first to third pressure guiding pipes 35, 36, 37, respectively. Yes. The compressed air sent from the air compressor 6 is supplied to the first pressure pipe 24 and the second pressure pipe 25 via the first to third pressure guiding pipes 35, 36 and 37. Therefore, compressed air is supplied to the first pressure pipe 24 and the second pressure pipe 25 using the first to third pressure guiding pipes 35, 36 and 37 connected to the first to third pressure gauges 31, 32 and 33. By doing so, the structure of the wind speed measuring device 1 can be simplified.

  Moreover, in the wind speed measuring device 1 of this embodiment, the 1st-3rd piping 61, 62, 63 which is piping from the air compressor 6 is connected in the 1st-3rd pressure guiding pipes 35, 36, 37. Electromagnetic valves 35a, 36a, and 37a are disposed between the location and the first to third pressure gauges 31, 32, and 33, respectively. The controller 9 closes the electromagnetic valves 35a, 36a, and 37a when compressed air is supplied to the first pressure pipe 24 and the second pressure pipe 25. Therefore, the measurement by the first to third pressure gauges 31, 32, 33 can be prevented from being affected by the compressed air sent from the air compressor 6.

  Further, in the wind speed measuring device 1 of the present embodiment, the controller 9 outputs the pressure measured by the first to third pressure gauges 31, 32, 33 and displays the pressure on the display 8. And while the compressed air is supplied to the 1st pressure pipe 24 and the 2nd pressure pipe 25, the controller 9 measures with the 1st-3rd pressure gauges 31, 32, 33 before compressed air is supplied. The generated pressure is output and displayed on the display 8. Therefore, the pressure can be continuously output while the compressed air is supplied to the first to third pressure gauges 31, 32, and 33.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

  For example, in the above-described embodiment, the case where the compressed air is periodically supplied to the first pressure pipe 24 and the second pressure pipe 25 has been described, but the present invention is not limited to this. The supply of compressed air to the first pressure pipe 24 and the second pressure pipe 25 may be performed irregularly.

  Further, in the above-described embodiment, the air supplied from the air compressor 6 to the first pressure pipe 24 and the second pressure pipe 25 has a dew point temperature equal to or lower than the dew point temperature of the measurement air (air in the test chamber 4). And although the case where temperature was less than 0 degree | times was demonstrated, the dew point temperature and temperature of the air supplied to the 1st pressure pipe 24 and the 2nd pressure pipe 25 are not limited to this. That is, the dew point temperature may be higher than the dew point temperature of the measurement air, and the temperature may be 0 degree or higher. Further, a gas other than air may be sent from the air compressor 6.

  In the above-described embodiment, the compressed air sent from the air compressor 6 passes through the first to third pressure guiding pipes 35, 36, and 37 connected to the first to third pressure gauges 31, 32, and 33. However, the present invention is not limited to this case. That is, in addition to the first to third pressure guiding pipes 35, 36, and 37, a pipe that directly connects the air compressor 6, the first pressure pipe 24, and the second pressure pipe 25 may be provided.

  In addition, in the above-described embodiment, the first to third pressure guiding pipes 35, 36, and 37 are connected to the first to third pipes 61, 62, and 63 that are pipes from the air compressor 6. Although the case where the electromagnetic valves 35a, 36a, and 37a are respectively disposed between the first to third pressure gauges 31, 32, and 33 has been described, these electromagnetic valves 35a, 36a, and 37a may not be provided. .

  Moreover, in the above-mentioned embodiment, although the controller 9 demonstrated the case where the pressure measured with the 1st-3rd pressure gauge 31, 32, 33 was output and displayed on the display 8, it is limited to this. It is not a thing. That is, for example, the controller 9 may output the pressure measured by the first to third pressure gauges 31, 32, 33 and print it with a printer, or store it in a storage device.

  In the above-described embodiment, while compressed air is being supplied to the first pressure pipe 24 and the second pressure pipe 25, the first to third pressure gauges 31, 32, Although the case where the pressure measured at 33 is displayed on the display 8 has been described, the present invention is not limited to this. That is, for example, while the compressed air is being supplied to the first pressure pipe 24 and the second pressure pipe 25, the average pressure measured by the first to third pressure gauges 31, 32, 33 is displayed. 8 may be displayed.

  Furthermore, in the above-mentioned embodiment, although the environmental test apparatus 100 adjusts temperature and humidity, it may adjust at least one among temperature and humidity.

  In addition, in the above-described embodiment, the wind speed measuring machine 1 is used in the environmental test apparatus 100, but the wind speed measuring machine 1 may be used in other apparatuses.

1 Wind speed measuring machine 4 Test room 6 Air compressor (gas supply means)
9 Controller (supply control means, valve control means, output means)
10 Test object 24 First pressure tube 24a Measurement hole (first measurement hole)
25 Second pressure tube 25a Measurement hole (second measurement hole)
31, 32, 33 First to third pressure gauges 35, 36 First pressure guiding tube, second pressure guiding tube (single connection pressure guiding tube)
37 3rd impulse line (double connected impulse line)
35a, 36a, 37a Solenoid valve (open / close valve)
52 Humidifier (air conditioner)
53 Heater (air conditioner)
54 Cooler (air conditioner)
61a, 62a, 63a Solenoid valve (gas supply means)
100 Environmental test equipment

Claims (8)

A pitot tube type wind speed measuring machine,
A first pressure pipe formed with a first measurement hole to which the total pressure is applied;
A second pressure tube formed with a second measurement hole to which a static pressure is applied;
A wind speed measuring machine comprising gas supply means for supplying compressed gas to the first pressure pipe and the second pressure pipe. Further comprising supply control means for controlling the gas supply means;
The wind speed measuring device according to claim 1, wherein the supply control means controls the gas supply means so that compressed gas is periodically supplied to the first pressure pipe and the second pressure pipe. .   The wind speed measuring device according to claim 1 or 2, wherein the compressed gas supplied by the gas supply means is air having a dew point temperature equal to or lower than a dew point temperature of the measurement air.   The wind speed measuring device according to any one of claims 1 to 3, wherein the temperature of the compressed gas supplied by the gas supply means is less than 0 degrees. At least one of two single connection pressure guiding pipes connected to the first pressure pipe and the second pressure pipe, respectively, and one double connection pressure guiding pipe connected to both the first pressure pipe and the second pressure pipe When,
A pressure gauge connected to at least one of the two single-connection pressure pipes and the one double-connection pressure pipe;
The gas supply means supplies compressed gas to the first pressure pipe and the second pressure pipe via at least one of the two single connection pressure pipes and the one double connection pressure pipe. Item 5. The wind speed measuring device according to any one of Items 1 to 4. On / off valves respectively disposed between the location where the compressed gas is supplied and the corresponding pressure gauge in at least one of the two single connection pressure guiding tubes and the one double connection pressure guiding tube,
Valve control means for controlling the on-off valve,
The wind speed measuring device according to claim 5, wherein the valve control means closes the on-off valve when compressed gas is supplied by the gas supply means. It further comprises output means for outputting the pressure measured by the pressure gauge,
The output means outputs the pressure measured by the pressure gauge before the compressed gas is supplied while the compressed gas is supplied by the gas supply means. The wind speed measuring machine described. The wind speed measuring device according to any one of claims 1 to 7,
A test chamber in which the DUT is placed;
An air conditioner for adjusting at least one of temperature and humidity in the test chamber;
The wind speed measuring device is for measuring the wind speed in the test chamber.

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