JPH0527680U - Float for detecting minute flow rate - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a float capable of visually observing the flow state (presence or absence of flow) even at a minute flow rate in a site flow or the like. [Structure] A float main body 22 is formed of an elongated hollow cylindrical body 22, and a resistance plate body 30 is attached to this to form the float 20. Enclose a specified amount of liquid with a specified specific gravity inside the float body,
The specific gravity of the entire float is extremely close to the specific gravity of the observation fluid, but the specific gravity is set to be slightly lighter than this (approximate light specific gravity). However, since the degree of scattering of the float in the fluid depends on the approximate light specific gravity and the fluid resistance of the float, according to the present invention, the float is surely scattered even in a minute flow rate state, and therefore the flow of the observation fluid is reduced. The state can be clearly seen.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 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]

[Prior Art]

 As shown in FIG. 3, the site flow 10 generally comprises a box body 14 having a sight glass 12 on its side surface, and 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 accommodated 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]

[Problems to be solved by the device]

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

That is, in the site flow, since the fluid flow state 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, in order to be able to deal with a very small flow rate of the fluid, that is, a minute flow velocity of the site flow inside the box, the float has its specific gravity within the range of the minimum specific gravity with respect to the specific gravity of the fluid. It is required that the fluid resistance be set to be as large as possible (hereinafter referred to as large fluid resistance). However, conventional floats are generally formed into spheres. Therefore, in the conventional float, it was practically extremely difficult to manufacture or select the specific gravity of the float to have an approximate light specific gravity, and the fluid resistance was small. Therefore, in the conventional site flow, when the flow rate of the fluid is very small, the floating state is maintained without scattering, and the minute flow rate can be visually inspected, that is, the presence or absence of the flow can be detected. could not.

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]

[Means for Solving the Problems]

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

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

[0008]

[Action]

 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 with 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 body to this, the fluid resistance of the float can be increased as much as possible. As a result, the float generates scattering without stopping even in a minute flow state. That is, the presence / absence of a flow can be reliably visually recognized (detected) even in a minute flow rate state.

[0009]

【Example】

 Next, an embodiment of a float for detecting minute flow rate according to the present invention will be described in detail 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 20 replaces the conventional float 18 in the site flow 10 shown in FIG. It is clear that it will be used.

Referring to 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 to the float body 22. The float body 22 is formed as an elongated hollow cylindrical body by adhering both end sealing lids 26, 26 to an elongated cylinder 24 made of plastic or the like. The diameter d and the length of the cylindrical body are preferably set to about 10 mm and 15 mm, respectively. On the other hand, the resistance plate body 30 has its area set to be larger than the projected area 22a of the float body 22. Then, in the float 20 configured in this way, a predetermined amount of liquid (usually water) having a predetermined specific gravity is sealed inside the main body 22 of the float so that the specific gravity of the entire float 20 is as large as possible with respect to the specific gravity of the observation fluid. The specific gravity is set so that the specific gravity is within a very small range (approximate light specific gravity).

However, according to the minute flow rate detecting float 20 of the present invention having such a configuration, the specific gravity of the entire float 20 is extremely accurate and easy to reach the approximate light specific gravity by limiting the amount of the enclosed fluid. In addition to being settable, the fluid resistance of the float 20 can be set large due to its elongated shape and the resistance plate body, and therefore exhibits extremely sensitive characteristics to the flow of the observation fluid. Therefore, even when the observation fluid has a very small flow rate (flow velocity), the float 20 does not stagnant and scatters sharply. 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 body and the resistance plate body has been described, but it is possible to detect a minute flow rate without trouble even if it is composed of only the float body. Is. In this case, it is needless to say that 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 main body can be formed into 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]

[Effect of the device]

 As described above, in the micro flow rate detection float according to the present invention, the float body is composed of a hollow body having a large fluid resistance shape, and a predetermined amount of liquid having a predetermined specific gravity is enclosed inside the float body. Therefore, 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 approximate to the specific gravity of the observation fluid. Therefore, the float reacts very sensitively to the flow of the observation fluid in the site flow, and is surely scattered even in a minute flow rate state, which makes it possible to clearly recognize (detect) the flow state. .

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional view of the minute 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 in the inside of 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.