JPH05288636A - Blast pressure measuring apparatus - Google Patents

Abstract

PURPOSE:To obtain a flow rate adjustor which is handy and convenient with excellent measuring accuracy by allowing the replacing of a flow rate adjusting section adjustable finely without changing an air tunnel. CONSTITUTION:This apparatus has an air tunnel 1 connected to an actuator 11 through a housing 9 and a valve 24 with a slot 26 sideways. It is also provided with a flow rate adjusting section 20 which has an adjusting means capable of adjusting the flow rate of air in the air tunnel 1 finely according to changes in the area of the opening of the hole 26 with the valve 24 and is connected to the air tunnel 1 free to load or unload.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring the blast pressure generated by an air flow generator (for example, a turbo fan) used in home electric appliances.

[0002]

2. Description of the Related Art FIG. 3 is a view for explaining the construction of a conventional blast pressure measuring device, a part of which is shown in cross section, and a left side view of a wind tunnel, and FIG. 4 is an external perspective view thereof. In the figure, 1 is a wind tunnel formed in a cylindrical shape with a bottom, and one end of the wind tunnel 1 has O
A groove 1b in which the ring 2 is arranged is provided, and a plurality of release holes 3 for discharging a part of the air from the wind tunnel 1 to the outside at the time of measurement are provided at the bottom of the other end.
A thread portion 4 for a pipe is provided in the vicinity of. Reference numeral 5 is a plug attached to the pipe thread portion 4, 6 is a socket of the plug 5 having a blower pipe 7, 8 is a pressure measuring device, which is connected to the blower pipe 7, and the air from the wind tunnel 1 is blown by the plug 5 and the blower blower 7. The pressure is measured by flowing to the pressure measuring device 8 through the pipe 7.

Reference numeral 9 is a housing for holding the wind tunnel 1, and the wind tunnel 1 is fixed by a set screw 10. 11 is an actuator, 12 is a bolt, and the housing 9 is a bolt 12
Is connected to the actuator 11 by. 1
Reference numeral 3 denotes a blower tube of a turbo fan, for example, which measures the generated air pressure, and is connected to the air intake 1a of the wind tunnel 1.

The wind tunnel 1 constructed as described above is moved in the direction of arrow A to connect the air supply tube 13 of the turbo fan to the air intake 1a through the O-ring 2, and then the turbo fan is driven to supply the air supply tube 13. Sends the wind into the wind tunnel 1. At this time, the flow rate W of the air sent into the wind tunnel 1 is divided into the measurement flow rate X and the loss flow rate Y at a predetermined ratio according to the turbo fan to be measured without being supplied to the pressure measuring device 8 as it is, and the loss All the flow rate Y is discharged from the release hole 3 to the outside, and the measured flow rate X flows to the pressure measuring device 8 via the plug 5 and the pressure is measured.

[0005]

As described above, in the conventional blast pressure measuring device, in order to divide the flow rate W into the measured flow rate X and the loss flow rate Y at a predetermined ratio according to the model of the air volume generator, Release hole 3 that matches the ratio of the loss flow rate Y
It was very inconvenient because it was necessary to prepare a different wind tunnel 1 having the following, and to replace it with a wind tunnel 1 suitable for each change in the measured air volume generator.

Further, since the measurement of pressure requires extremely severe trace measurement, all the processing precision including the release hole 3 becomes a problem, and reprocessing is performed so as not to cause significant erroneous measurement due to these processing. However, it took time and effort because the accuracy test was repeated.

Further, during the measurement, the analog fine adjustment with the pressure measuring device 8 for compensating for the erroneous measurement due to the processing accuracy or the like cannot be performed in the wind tunnel 1, and the pressure is measured according to the processing condition of the wind tunnel 1. Since the device 8 was finely adjusted, the reproducibility of the pressure measuring device 8 after the model change of the air flow generator was difficult.

The present invention has been made in order to solve the above-mentioned problems, and it is simple, convenient, and excellent in measurement accuracy by exchanging only a flow rate adjusting portion capable of minute adjustment without exchanging a wind tunnel. It is intended to provide a blast pressure measuring device.

[0009]

A blower pressure measuring device according to the present invention has a wind tunnel connected to an actuator through a housing and a valve having a laterally long hole, and the opening of the hole by the valve. A flow rate adjusting unit detachably connected to the wind tunnel having an adjusting unit for minutely adjusting the flow rate of air in the wind tunnel according to a change in area.

[0010]

The flow rate adjusting unit corresponding to the air volume generator to be measured is connected to one end of the wind tunnel fixed to the actuator through the housing, and the air supply tube of the air volume generator is connected to the other end. After connection, drive the air volume generator to send the wind into the wind tunnel, so that the flow rate of the sent air can be divided into the measured flow rate and the loss flow rate at a predetermined ratio according to the air volume generator to be measured,
The opening area of the hole provided in the valve is changed to finely adjust the loss flow rate, and the pressure of the measurement flow rate flowing into the pressure measuring device is measured.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a structural explanatory view showing a part of an embodiment of the present invention in section, and FIG. 2 is an external perspective view of an embodiment of the present invention. The same or corresponding parts as those of the conventional example described with reference to FIGS. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted. In the drawing, 14 is a pillow, 15 is a universal in which a sleeve 16 is press-fitted in the central portion, the pillow 14 and the universal 15 are incorporated in a housing 9 by a stop plate 17 and a bolt 18, and the wind tunnel 1 is connected via a spring 19. It is inserted in the sleeve 16.

Reference numeral 20 is a flow rate adjusting portion provided separately from the wind tunnel 1. Reference numeral 21 denotes a connector having a through hole, which is provided with a groove 21a in which an O-ring 22 is disposed. One end of the connector 21 is connected to the wind tunnel 1 by a ball plunger 23 via the O-ring 22. In addition, the connector 21
A pipe thread part 4 to which a plug 5 is attached at approximately the center of
Is provided to measure the pressure of the flow rate in the wind tunnel 1. Reference numeral 24 is a release valve having a fine threaded portion 24a, which is a female screw 21b provided in a through hole of the connector 21.
It is screwed onto and fixed by a set screw 25. 26
Is a release hole that is long in the lateral direction and discharges a part of the air from the wind tunnel 1 to the outside. A plurality of release holes are provided on the outer periphery of the release valve 24. The opening area can be changed freely.

Next, the operation of the present invention will be described.
First, for example, a flow rate adjusting unit 20 having a release valve 24 suitable for a turbo fan to be measured in the wind tunnel 1 fixed to the housing 9 is connected to the wind tunnel 1 via a connector 21 and fixed by a ball plunger 23. Arrow A
It moves in the direction to connect the blower tube 13 of the turbofan to the air inlet 1a. Then, when the turbo fan is driven to blow the air into the wind tunnel 1 from the air supply tube 13, the flow rate W of the sent air is measured at a predetermined rate according to the turbo fan to be measured as in the conventional example. And the loss flow rate Y, and the measured flow rate X flows to the pressure measuring device 8 through the plug 5 to measure the pressure, and all the loss flow rate Y is discharged from the release hole 26 to the outside. At this time, the release valve 24
Is to finely adjust the loss flow rate Y by changing the opening area of the release hole 26 by the screwing condition of the release valve 24 so that the flow rate W of the air in the wind tunnel 1 can be divided at a predetermined ratio according to the turbofan to be measured. ..

In the above-mentioned embodiment, the case where the flow rate adjusting section 20 is replaced by the connector 21 connected to the wind tunnel 1 has been described as an example, but only the release valve 24 is replaced without attaching or detaching the connector 21. You may do it. Also,
The wind tunnel 1 is inserted into the sleeve 16 via the spring 19, and the pillow 9 and the universal 15 are attached to the housing 9.
However, the wind tunnel 1 may be fixed by the set screw 10 as in the conventional example without using such a complicated structure.
Furthermore, although the case where the pressure of air is measured has been shown, the present invention can be similarly applied to the case where the suction amount of air or the pressure or flow rate of liquid is measured.

[0015]

As described above, the present invention has a wind tunnel connected to an actuator through a housing and a valve having a laterally long hole, and the change of the opening area of the hole by this valve causes the air flow. Since it has a flow rate adjuster that is detachably connected to the wind tunnel that has an adjusting means for minutely adjusting the flow rate, even when measuring the blow pressure of different air volume generators, only the flow rate adjuster without changing the wind tunnel is used. It is only necessary to replace them, the replacement work and the adjustment work become easy, and there is no risk of erroneous measurement due to the machining accuracy of the wind tunnel. Further, it becomes easy to minutely adjust the flow rate for dividing the flow rate at a predetermined rate according to the model of the air flow generator, and it is possible to obtain a blast pressure measuring device with high measurement accuracy.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing a part of an embodiment of the present invention in cross section.

FIG. 2 is an external perspective view of an embodiment of the present invention.

FIG. 3 is a configuration explanatory view of a conventional blast pressure measuring device and a left side view of a wind tunnel, a part of which is shown in section.

FIG. 4 is an external perspective view of a conventional blast pressure measuring device.

[Explanation of symbols]

 1 Wind Tunnel 1a Air Vent 8 Pressure Measuring Instrument 9 Housing 11 Actuator 13 Air Supply Tube 20 Flow Rate Adjustment Section 21 Connector 24 Release Valve 24a Fine Threaded Section 26 Release Hole W Flow Rate X Measured Flow Rate Y Loss Flow Rate

Claims (1)

[Claims] 1. An apparatus for measuring a blowing pressure from an air flow generator, comprising a wind tunnel connected to an actuator through a housing, and a valve having a laterally long hole, and the opening of the hole by the valve. A blower pressure measuring device, comprising: a flow rate adjuster removably connected to the wind tunnel, which has an adjusting unit for minutely adjusting a flow rate of air in the wind tunnel according to a change in area.