JPH073335Y2 - Float for detecting minute flow rate - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an observation float used in a site flow for observing the flow state of a fluid flowing in a pipe.

[0002]

2. Description of the Related Art As shown in FIG. 3, a site flow 10 generally comprises a box body 14 having a sight glass 12 on its side surface, which is usually arranged in the middle of a pipe 16. A float 18 having a specific gravity lighter than the specific gravity of the flowing fluid is housed inside the box body 14, and when the fluid flows, the float floats and moves (hereinafter, referred to as scattering). By observing from the sight glass 12, the flow state of the fluid can be visually recognized.

[0003]

However, the above-mentioned conventional sight glass has the following drawbacks.

That is, in the site flow, since the flow state of the fluid is observed by the scattering degree of the float as described above, the float must have a sensitive sensitivity to the flow of the fluid. By the way, this sensitivity depends on the relative specific gravity related to the fluid specific gravity of the float and the fluid resistance related to the fluid flow. Therefore, especially when the flow rate of the fluid is very small,
That is, in order to be able to cope with the minute state of the flow velocity in the box body of the site flow, the float has its specific gravity as light specific gravity within a range as small as possible with respect to the specific gravity of the fluid (hereinafter referred to as approximate light specific gravity) It is required to set the fluid resistance as high as possible (hereinafter referred to as large fluid resistance). However, the conventional float is generally formed into a sphere.
Therefore, in the conventional float, it is practically very difficult to manufacture or select the specific gravity of the float to have an approximate light specific gravity, and the fluid resistance is small. Therefore, in the conventional site flow, when the flow rate of the fluid is very small, the floating state is maintained without being scattered.
It was not possible to visually check the minute flow rate, that is, to detect the presence or absence of the flow.

Therefore, an object of the present invention is to provide a float capable of visually recognizing (detecting) the presence or absence of a flow even in a minute flow rate state.

[0006]

In order to achieve the above object, a float for detecting a minute flow rate according to the present invention comprises a float body which is a hollow body having a large fluid resistance shape. It is characterized in that a predetermined amount of liquid having a predetermined specific gravity is enclosed.

In this case, the hollow body is formed into an elongated cylindrical body,
Further, it is preferable that the resistance plate body having an area larger than the projected area of the float body is attached to the cylindrical body.

[0008]

The float can be easily set to its approximate light specific gravity with respect to the specific gravity of the observation fluid by enclosing a predetermined amount of fluid of a specific gravity inside the hollow body. Further, by forming the body of the float into a shape having a large fluid resistance such as an elongated cylinder and further attaching a resistance plate to this, the fluid resistance of the float can be increased as much as possible. As a result, the float causes scattering without stopping even in a minute flow rate state. That is, the presence / absence of the flow is surely visually recognized (detected) even in the minute flow rate state.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a micro flow rate detecting float according to the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 show a float 20 for detecting a minute flow rate according to the present invention. First, as a precaution, the float 2 is used.
It is obvious that 0 is used instead of the conventional float 18 in the site flow 10 shown in FIG.

In FIGS. 1 and 2, a micro flow rate detecting float 20 of the present invention is basically composed of a float body 22 and a resistance plate body 30 attached thereto. Float body 2
2 is an elongated hollow cylindrical body formed by adhering both end sealing lids 26, 26 to an elongated cylinder 24 made of plastic or the like.
The cylindrical body has a diameter d and a length of 10
It is preferable to set to about mm and 15 mm. On the other hand, the resistance plate body 30 has an area equal to the projected area 22a of the float body 22.
Set larger. Then, in the float 20 configured in this way, a predetermined amount of liquid (usually water) having a predetermined specific gravity is enclosed inside the main body 22 of the float, so that the specific gravity of the entire float 20 is as large as the specific gravity of the observation fluid. The specific gravity is set so as to be a light specific gravity (approximate light specific gravity) within a very small range.

However, according to the minute flow rate detecting float 20 of the present invention having such a structure, the specific gravity of the entire float 20 is extremely accurately and easily set to the approximate light specific gravity by limiting the amount of the enclosed fluid. In addition, since the fluid resistance of the float 20 can be set to be large by the elongated shape and the resistance plate body, it exhibits extremely sensitive characteristics to the flow of the observation fluid. Therefore, even when the observation fluid has a very small flow rate (velocity), the float 20 is not stagnant and is sharply scattered. That is, the flow state (whether the flow is present or absent) can be reliably visually recognized (detected).

In the above-described embodiment, the case where the float is composed of the combination of the float main body and the resistance plate body has been described. However, even if the float is composed only of the float main body, it is possible to detect a very small flow rate without any trouble. . In this case, of course, the specific gravity of the float body can be set to the approximate light specific gravity. Further, it is needless to say that the float body may be formed in a hollow body having a large fluid resistance other than the hollow cylindrical body.

The present invention has been described above with reference to the preferred embodiments, but the present invention is not limited to the above embodiments, and many design changes can be made within the spirit of the invention.
The present invention can also be applied to this type of device other than the site flow.

[0015]

As described above, the float for detecting a minute flow rate according to the present invention comprises a float body having a hollow body having a large fluid resistance shape, and a predetermined amount of liquid having a predetermined specific gravity inside the float body. Since it is configured to be enclosed, it is possible to accurately and easily set the specific gravity of the float to a light specific gravity in a range that is extremely close to the specific gravity of the observation fluid. Therefore, the float reacts extremely sensitively to the flow of the observation fluid in the site flow and surely scatters even in a minute flow rate state, and makes it possible to visually recognize (detect) the flow state clearly.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a float for detecting a minute flow rate according to the present invention.

FIG. 2 is a vertical cross-sectional view of the micro flow rate detection float shown in FIG.

FIG. 3 is a cross-sectional view illustrating a conventional float used for site flow.

[Explanation of symbols]

 20 ... Float for detecting minute flow rate 22a ... Projected area 24 ... Elongated cylinder 26 ... Sealing lid 28 ... Filled liquid 30 ... Resistance plate

Claims (3)

[Scope of utility model registration request] 1. A float for detecting a minute flow rate, wherein a float body is composed of a hollow body having a large fluid resistance shape, and a predetermined amount of a liquid having a predetermined specific gravity is enclosed inside the float body. 2. The float for detecting a minute flow rate according to claim 1, wherein the hollow body is an elongated cylindrical body. 3. The float for detecting a minute flow rate according to claim 1, wherein a resistance plate body having an area larger than a projected area of the float body is attached to the float body.