JPS6250763B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention detects the presence or absence of fluid flow by using the pressure difference generated between the upstream and downstream sides of an orifice wall provided in a fluid passage. It is related to galvanometers.

(Prior Art) A flowmeter disclosed in Japanese Utility Model Publication No. 1983-528 is known as a device capable of measuring the flow rate of fluid by utilizing the pressure difference generated between the upstream and downstream sides of an orifice wall.

(Problems to be Solved by the Invention) The purpose of the flowmeter is to measure the flow rate, and the pressure introduction path in which the movable body is loaded is transparent and exposed to the outside. For this reason, the transparent pressure introduction channel itself needs to have sufficient pressure resistance, and a certain level of strength against unexpected external forces is also required, so sufficient consideration must be given to the strength of the pressure introduction channel.

In order to simply detect the presence or absence of flow,
A simple and durable galvanometer was desired.

(Means for Solving the Problems) The current galvanometer of the present invention includes an orifice wall provided in the fluid passage to generate pressure loss due to flow velocity,
An upstream (front) side pressure introduction path is branched from the fluid passage on the upstream (front) side of the orifice wall, and an upstream (front) side pressure introduction path is provided on the downstream (back) side of the orifice wall in order to introduce the loss pressure as efficiently as possible. The movable body is placed in communication with a downstream (back) side pressure introduction path branched from the fluid passage close to the orifice wall, and a movable body is mounted in one of the above pressure introduction paths so as to be movable up and down. When the fluid flows through the fluid passage, a pressure difference occurs between the front and back sides of the orifice wall, and this pressure difference causes the movable body to move up and down the pressure introduction path. It is designed so that it can be detected.

Further, the pressure introduction path loaded with the movable body is transparent, and a viewing window is provided in the housing thereof, and
Adjustment rods are protruding from the top and bottom of the movable body or the pressure introduction path to regulate the upward or downward displacement position,
The movable body is always visible through the viewing window when the flow is stopped, and is hidden from view when the flow is stopped.

(Function of the Invention) In this invention, when fluid flows, a pressure difference is generated before and after the orifice wall, so the movable body in the pressure introduction path moves up or down, so the movable body cannot be seen through the viewing window. Since the maximum displacement position is regulated by the adjustment rod, the movable body is always located at a height visible from the viewing window.

(Example) Examples of the present invention will be described below based on the drawings.

The galvanometer A has a fluid passage 3 leading from an inlet 1 to an outlet 2, and an orifice wall 4 is provided in the center of this passage 3 to generate a pressure loss due to the flow velocity. The orifice wall 4 is configured in such a shape that a large pressure loss occurs due to the flow velocity. On the upstream (front) side of the orifice wall 4, an upstream (front) side pressure introduction passage 5 is branched from the passage 3, and on the downstream (back) side of the orifice wall 4, the above loss pressure is introduced as efficiently as possible. Therefore, the downstream (back) side pressure introduction passage 6 is located close to the orifice wall 4.
is branched from passage 3, and both pressure introduction passages 5 and 6
communicate with each other at the upper tip.

In the case of the embodiment shown in FIG. 1, a float is used as the movable body 7, and the downstream (back) side pressure introduction passage 6 is arranged so that the float 7 can freely move up and down. It consists of a large diameter section 6a and a small diameter section 6b extending from this section to the passage 3, and a float 7 is loaded into this large diameter section 6a so as to be able to rise and fall. This float 7 has no water absorption property, and as shown below, the upstream (front) side pressure introduction passage 5
When a pressure difference occurs between the pressure difference and the downstream (back) side pressure introduction passage 6, the light-weight sphere descends due to the pressure difference, and when the pressure difference disappears, it rises due to buoyancy. In order for it to work visually, it is colored in an easily visible color.

Further, in the case of the embodiment shown in FIG. 2, an object that sinks due to its own weight is used as the movable body 7, contrary to the float, and the upstream (front) side pressure introduction path 5 is connected to the movable body 7. The movable body 7 is made up of a large path diameter portion 5a and a small path portion 5b that reaches this portion from the passage 3 so that the movable body 7 can move up and down freely. It is loaded freely. As described below, when a pressure difference occurs between the upstream (front) side pressure introduction path 5 and the downstream (back) side pressure introduction path 6, the movable body 7 rises due to the pressure difference,
It is constructed as a weighted sphere that descends under its own weight when the pressure difference disappears, and in order for this to work visually as described below, it is colored in an easy-to-see color.

The current galvanometer A according to the present invention is basically configured as described above, so that when fluid flows in from the inlet 1, passes through the passage 3, and flows out from the outlet 2, the flow is caused by the orifice wall 4. , a pressure loss occurs due to the flow velocity, and a pressure difference occurs between the upstream (front) side and the downstream (back) side of the orifice wall 4. In other words, since the pressure in the upstream (front) side pressure introduction path 5 is greater than the pressure in the downstream (back) side pressure introduction path 6, the float 7 in FIG. 1 moves down the path diameter portion 6a due to the pressure difference. The movable body 7 in FIG. 2 moves up the path portion 5a. Therefore, when the fluid flow stops, the pressure difference between the upstream (front) side and the downstream (back) side of the orifice wall 4 disappears. In other words, the pressure in the upstream (front) side pressure introduction path 5 and the pressure in the downstream (back) side pressure introduction path 6 become equal, the float 7 in FIG. 1 rises due to buoyancy, and the movable body 7 in FIG. descends under its own weight.

Therefore, as shown in FIG. 3, the path diameter portion 6a of the downstream (back) side pressure introduction path 6 is configured as a transparent cylinder.
Furthermore, as shown in FIG. 4, a viewing window 9 is provided at the upper and lower intermediate portions of the housing 8, and an adjustment rod 10 (of the float) is used to adjust the position when the fluid flow stops and the float 7 moves upward as described above. The float 7 is placed in the center of the viewing window 9 by the
When the fluid is flowing, the float 7 is displaced downward in the path diameter portion 6a, so it cannot be seen through the viewing window 9, and the flow of the fluid is stopped. When you are doing
Since the float 7 is displaced upward in the path diameter portion 6a,
It can be seen through the viewing window 9. Since the amount of upward displacement of the float is regulated by the adjustment rod, the float does not rise above the position corresponding to the viewing window when the flow is stopped, and can always be seen through the viewing window. In the case of the embodiment shown in FIG. 2, the displacement of the movable body 7 is opposite to that of the float, so if the positions of the viewing window 9 and the adjustment rod 10 are changed to match this, the same effect as above can be obtained. can be obtained. In this case, the adjustment rod 10 is attached to the bottom of the float or the bottom of the pressure introduction path.

Although not shown, in the embodiment shown in FIG. 1, a coil spring for supporting the downward displacement of the float 7 is loaded in the inner lower part of the path portion 6a, and in the embodiment shown in FIG. A coil spring for supporting the upward displacement of the movable body 7 may be installed in the upper part of the inside of the float 5a to adjust the amount of displacement of the float or the movable body 7 due to a change in flow rate. Furthermore, as mentioned above, the vertical displacement of the movable body 7 due to the pressure difference between the upstream (front) side pressure introduction path 5 and the downstream (back) side pressure introduction path 6 can be controlled electrically. It can also be configured to detect the presence or absence of fluid flow or the flow rate based on the viewpoint.

(Effect of the invention) As described above, according to the galvanometer according to the present invention,
The presence or absence of fluid flow can be detected by capturing the vertical displacement of the movable body due to the pressure difference generated between the front and back sides of the orifice wall due to fluid flow.

Furthermore, since the pressure introduction path is housed within the housing, there will be no problem in terms of strength. Moreover, since the displacement position of the movable body is regulated by the adjustment rod, even when the flow stops, the movable body will not escape above or below the viewing window, and if the fluid does not flow more than a predetermined amount, it will always be visible through the viewing window. The movable body can be seen from the inside, but it becomes invisible when the fluid is flowing, and quick and accurate detection is possible depending on the presence or absence of the float.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the invention.
1 and 2 are front sectional views showing the basic configuration of the present invention, FIG. 3 is a front sectional view showing the specific configuration in the case of FIG. 1, and FIG. FIG. 3 is an external front view showing a specific configuration in the case of FIGS. 1 and 3. FIG. In addition, in the drawing, 1 is the entrance, 2 is the exit, 3
is a passage, 4 is an orifice wall, 5 is an upstream (front) side pressure introduction passage, 5a is a large diameter passage, 5b is a small passage diameter part, 6 is a downstream (back) side pressure introduction passage, 6a is a large diameter passage. 6b is a small diameter path portion, 7 is a movable body or float, 8 is a housing, 9 is a viewing window, 1
0 is an adjustment rod.

Claims (1)

[Claims] 1 An orifice wall is provided in the fluid passage, and an upstream pressure introduction passage branched from the fluid passage on the upstream side of the orifice wall, and a downstream pressure introduction passage branched from the fluid passage adjacent to the orifice wall on the downstream side of the orifice wall. In the galvanometer, the movable body is connected to the side pressure introduction passage and is loaded in one of the pressure introduction passages, and is moved up and down by the pressure difference generated between the upstream side and the downstream side of the orifice wall due to the flow of fluid. The pressure introduction path in which the movable body is loaded is transparent, and a viewing window is provided in the upper and lower intermediate portions of the housing, and adjustment is made to restrict the upward or downward displacement position of the movable body to the viewing window corresponding portion when the flow is stopped. A galvanometer with a protruding rod.