JPH07294544A - Fluid detection device - Google Patents

Abstract

PURPOSE:To obtain a detection device which seldom has a trouble and surely operates in a simple structure by a constitution wherein a cylindrical member allowing a fluid to pass is provided in the way of a fluid pipe and a moving body having a permanent magnet pressed by a spring is provided in the cylindrical member. CONSTITUTION:When a cooling water 10 adequately flows from an inflow socket 3 on the introduction side to a discharge socket 4 on the discharge side via a cylindrical member 2, a moving body 5 is raised by the pressure of the cooling water 10. A permanent magnet 9 sealed in the moving body 5 is close to a reed switch 6 and applies a magnetic field thereto so that the reed switch is in on-state. When a trouble such as clogging has occurred on the introduction side or discharge side of a cooling pipe 1, flowing speed of the cooling water 10 is lowered and the resistance against the moving body 5 is reduced, then the moving body 5 is pressurized by the spring 11 to be gradually separated from the position corresponding to the reed switch 6 so that it is pressed against opening end 3a of the inflow socket 3. The reed switch 6 is released from the magnetic field, then it is turned off before the cooling water 10 is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid detection device for detecting stoppage of a fluid flow disposed in various equipments and devices.

[0002]

2. Description of the Related Art In various kinds of physics and chemistry and industrial equipment, manufacturing equipment, etc., a cooling pipe is provided around the vacuum pump, a monitor, an outer wall of a vacuum chamber and the like so that the outer wall of the vacuum chamber is not overheated, and cooling water is circulated inside. . By the way, in the usual case, tap water or secondary water after using purified water is stored in the pool as cooling water, so it is easy for water stains to accumulate on the inner wall of the cooling pipe, causing water stains. Then, a part of the cooling pipe is easily clogged. When a clogging phenomenon occurs, the circulation of the cooling water stops, which may cause a serious accident.Therefore, it is necessary to constantly monitor the cooling water flowing through the cooling pipes in most equipment and devices. A fluid detection device for detecting water interruption is attached.

As one detection device, for example, a transparent tube in which a float moving inside by cooling water is arranged is provided in the middle of a cooling pipe, and the presence or absence of a moving body is confirmed by an optical sensor arranged outside the cylinder. When the float cannot be confirmed, there is one that detects that the water flow condition has deteriorated. Further, there is also known one in which a water turbine is arranged inside the cooling pipe and the fact that the flow of the cooling water is stopped due to the water turbine being stopped is known. However, as described above, since the secondary water is used as the cooling water, the former adheres to the inner wall of the transparent cylinder to reduce the transparency, and the latter also accumulates in the bearings of the turbine to cause the turbine to accumulate. Since it will stop rotation, both are prone to failure,
There is a drawback that malfunctions are likely to occur.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks and to provide a fluid detection device which operates with certainty due to a particularly simple structure, which is hard to fail and operates reliably.

[0005]

In order to achieve the above object, a fluid detecting device according to the present invention comprises a tubular member for passing the fluid from one end to the other at a midway portion of a pipe through which the fluid flows. Provided inside the tubular member is a moving body which is biased by a spring on the inflow side and provided with a permanent magnet, and magnetic detection means for detecting the magnetism of the permanent magnet is placed on the outer surface of the tubular member. It is characterized by having done.

[0006]

According to the fluid detecting apparatus having the above-mentioned structure, when the fluid normally flows through the tubular member, the fluid flowing into the tubular member resists the spring and the permanent magnet and the magnetic detecting means. The moving body is pushed back to a position where the distance between and becomes smaller.

On the other hand, when the supply side pipe is clogged, the flow rate of the fluid in the tubular member becomes small, so the resistance to the moving body becomes small and the moving body is urged by the spring to move. Further, when the discharge side pipe is clogged, the flow velocity of the fluid in the tubular member becomes slow, and the fluid stays in the tubular member. In this case as well, the resistance to the moving body decreases, and the moving body becomes a spring. It is urged by and moves.

As described above, when the flow of the fluid in the tubular member becomes abnormal, the moving body is urged by the spring to move, so that the distance between the permanent magnet and the magnetic detecting means also changes. Therefore, the abnormality of the fluid flow in the pipe can be detected by detecting the change in the magnetic field by the magnetism detecting means.

In addition, since the above-mentioned detection device has a simple structure and is not affected by the contamination of fluid, it is hard to break down, operates reliably, and can be manufactured at low cost, which is very useful.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a fluid detection device, which detects the flow of cooling water, and a cooling pipe 1 through which the cooling water flows. Inflow socket 3 provided in the middle of
A discharge member 4, a tubular member 2, a movable body 5 disposed inside the tubular member 2, biased by a spring 11 toward the inflow socket 3, and provided with a permanent magnet 9, and the tubular member 2 And a magnetic detecting means 6 arranged outside the.

A flange 7 is formed so as to project from one of the open ends 3a, 4a of the inflow socket 3 and the discharge socket 4, and a tubular member 2 is arranged between these flanges 7 and between the flange 7 and the tubular member 2. A sealing material 8 is interposed in the. The cooling pipes 1 are connected to the other open ends 3b and 4b, respectively.

The cooling pipe 1 connected to the inflow socket 3 is provided with a valve 18 so that the flow of the cooling water 10 can be stopped when the detector is maintained.

The tubular member 2 may be made of a non-magnetic material such as aluminum or plastic. When the transparent tubular member 2 is made of a transparent material such as acrylic resin, vinyl chloride resin, or glass, the flow state of the fluid can be visually recognized by seeing through the transparent tubular member 2 from the outside. The moving body 5 is arranged inside the tubular member 2 so as to be vertically movable. The moving body 5 is formed of glass fiber-containing epoxy resin into a substantially columnar shape, the diameter of which is set smaller than the inner diameter of the tubular member 2, and the cooling water that has flowed into the tubular member 2 has inner walls of the moving body 5 and the tubular member 2. And a conical portion 5a are formed at the tip.

The moving body 5 is not limited to the epoxy resin as long as it is a non-magnetic body, and may be a synthetic resin such as aluminum metal or plastic.

Further, since the moving body 5 is arranged so as to face the inflowing cooling water 10, when the moving body 5 swings left and right, the permanent magnets 9 move with the left and right swinging of the moving body 5. The magnetic field applied to the magnetism detecting means 6 changes when approaching or leaving the magnetism detecting means 6, and the movement of the moving body 5 between the upper and lower sides and the left and right sides cannot be distinguished, and the normal position of the moving body 5 can be confirmed. Since the cooling water 10 flows evenly around the peripheral surface of the moving body 5 so that the moving body 5 does not swing to the left or right, the conical portion 5a is formed at the tip, but the moving body 5 is stable. The angle of the cone is 55 to 6 to maintain the condition.
5 degrees is preferred, but the most preferred cone angle is 60 degrees.

A cylindrical permanent magnet 9 made of a rare earth magnet is enclosed in the moving body 5, a spring 11 is attached to the rear end, and the inflow socket 3 is attached to the front end.
Is urged so as to face the open end 3a. When the cooling water 10 flows in from the opening end 3 a, the spring 11 is compressed by the water force of the cooling water 10 and the moving body 5 is provided so as to push up the inside of the tubular member 2. The permanent magnet 9 may be exposed without protruding from the side surface of the moving body 5.

The magnetic detection means 6 is composed of a reed switch and is fixed to the outer surface of the tubular member 2. The magnetic detection means 6 (hereinafter, referred to as a reed switch) is provided with the cooling water 10
Flows into the tubular member 2 and the spring 11 is compressed by water pressure, the water pressure and the strength of the spring are balanced, and the spring 11 is fixed at a position where the magnetic field generated by the permanent magnet 9 provided in the moving body 5 can be detected. ing. Although the magnetic detection means 6 is composed of a reed switch, it may be composed of a magnetic sensor such as a Hall element or a magnetoresistive element. In that case, an amplifier circuit for amplifying the output of the magnetic sensor and a level determination circuit are required. The ON / OFF state can be confirmed from the outside by using a reed switch provided with an operation display LED (for example, Koganei sensor switch CS7G).

The spring 11 is made of stainless steel,
By molding with a non-magnetic metal such as beryllium copper or a synthetic resin such as plastic, it is possible to prevent the reed switch 6 from affecting the magnetism generated by the permanent magnet 9.

Further, the spring 11 having different strength may be changed depending on the viscosity and flow rate of the fluid, or the position for fixing the reed switch 6 may be changed, and the strength of the spring 11 and the position of the reed switch 6 may be changed. An optimum one may be selected from preset fluid detection devices.

According to the fluid detecting device having the above-described structure, when the cooling water 10 normally flows from the water inlet side inflow socket 3 through the tubular member 2 to the water outlet side discharge socket 4, FIG.
As shown in (a), the moving body 5 is pushed up by the water pressure of the cooling water 10. In this state, since the permanent magnet 9 enclosed in the moving body 5 is close to the reed switch 6, a magnetic field is applied and the reed switch 6 is turned on.

When the cooling pipe 1 on the water guide side is clogged or an abnormality occurs in the water supply device, the flow rate of the cooling water 10 gradually decreases and the water pressure of the cooling water 10 inside the tubular member 2 decreases, so that the moving body The resistance to 5 becomes small. Therefore, the moving body 5 is gradually biased from the position corresponding to the reed switch 6 by being biased by the spring 11, and eventually the moving body 5 is pressed against the open end 3a of the inflow socket 3 as shown in FIG. To be When the cooling pipe 1 on the drainage side is clogged, the flow velocity of the cooling water 10 gradually decreases and the cooling water 10 tends to stay in the tubular member 2.
The resistance due to is reduced, the moving body 5 is biased by the spring 11 and gradually moves away from the position corresponding to the reed switch 6, and eventually the moving body 5 is pressed against the open end 3a of the inflow socket 3. In this way, when the pipes on the water guiding side and the draining side are clogged, the permanent magnet 9 enclosed in the moving body 5
Is gradually separated from the position corresponding to the reed switch 6, so the reed switch 6 is released from the magnetic field and turned off before the cooling water 10 stops.

The ON / OFF state of the reed switch 6 is input to the control circuit 12 to activate the alarm device 13 composed of a lamp and a buzzer, as shown in FIG. 4 (a).
It can be stopped. With this, it is possible to know the abnormality or the flow rate of the cooling water 10 in the cooling pipe 1.

At the position where the reed switch 6 is fixed to the cylindrical member 2, the flow of the cooling water 10 is stopped and the moving body 5 is urged by the spring 11 to move the inflow socket 3 as shown in FIG. 3 (a). The position may be such that it approaches the permanent magnet 9 while being pressed against the open end 3a. As a result, when the cooling water 10 is flowing in, the permanent magnet 9 causes the reed switch 6 to operate.
Since the moving body 5 is swayed to the left and right and the magnetic field fluctuates, the reed switch 6 is not affected.

As described above, the above-mentioned fluid detection device has a simple structure and is not affected by the contamination of the fluid so that it is hard to break down, operates reliably, and can be manufactured at low cost, which is very useful. is there. Furthermore, by configuring the tubular member 2 with a transparent member such as acrylic resin, vinyl chloride resin, or glass, the flow state of the cooling water 10 can be visually recognized from the outside.

Further, as shown in FIGS. 3 (b) and 3 (c),
A plurality of reed switches 6 are provided on the outer surface of the tubular member 2 for moving the movable body 5.
By arranging in the moving direction of, the moving state of the moving body 5 can be grasped, so that the flow rate of the fluid can be detected. In addition, depending on the clogging of the cooling pipe 1, the flow rate of the cooling water 10 changes and the position of the moving body 5 changes, so that the reed switch 6 that reacts differs. Therefore, as shown in FIG. The reed switch 6 is connected to the control circuit 12, and the drive circuit 14 corresponding to each reed switch 6 is driven to turn on the alarm device 13 composed of a blue, yellow or red lamp, or from the voice synthesis IC 15. By amplifying the voice signal of the above with the amplification circuit 16 and outputting the voices such as "normal", "please be careful", and "abnormality has occurred" from the speaker 17, it is possible to grasp the condition in advance and deal with it. Therefore, it is possible to prevent a sudden failure from occurring and rushing to respond.

Further, as shown in FIG. 5A, the tubular member 2
The support portion 19 of the spring 11 may be formed in the middle of the above, or the support portion 19 of the spring 11 may be fixed to the flange 7 of the discharge socket 4 as shown in FIG. As a result, even if the spring 11 is compressed by the pressure of the fluid and the moving body 5 is pressed against the support portion 19, the moving body 5 and the spring 11 do not block the opening of the discharge socket 4. The flow is blocked, and the moving body 5 easily maintains a stable state in the fluid,
The magnetic detection of the reed switch 6 does not become unstable.

In the above example, the detection of the cooling water flow is described, but the thickness and flow rate of the pipe through which the fluid flows, the size of the shape adapted to the viscosity of the fluid, the strength of the spring, etc. should be set. Thus, it can be widely used as a detection device for detecting the flow of liquid or gas flowing through an oil supply pipe or a gas pipe of a petrochemical plant.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a fluid detection device according to the present invention.

2A and 2B are cross-sectional explanatory views showing the operation of the fluid detection device.

3A, 3B and 3C are cross-sectional explanatory views of another example of the fluid detection device.

4A and 4B are block diagrams of the fluid detection device.

5A and 5B are perspective views of another example of the fluid detection device.

[Explanation of symbols]

 1 Cooling Pipe 2 Cylinder Member 5 Moving Body 6 Magnetic Detection Device 9 Permanent Magnet 10 Cooling Water 11 Spring

Claims (1)

[Claims] 1. A midway portion of a pipe through which a fluid flows,
A tubular member that allows the fluid to pass from one end to the other end is provided, and a moving body that is biased by a spring on the inflow side and that includes a permanent magnet is disposed inside the tubular member, and an outer surface of the tubular member is provided. A fluid detection device comprising a magnetic detection means for detecting the magnetism of the permanent magnet.