JPH028189Y2 - - Google Patents

Description

[Detailed description of the invention] This invention introduces leaking fluid from the leakage fluid generating part into the device and issues an alarm when it reaches a certain level. It can be detected earlier than the flow rate. Regarding this, in the conventional one, a bearing is received between the upper diaphragm chamber (corresponding to No. 9 of the present invention) and the micro switch chamber (corresponding to No. 4 of the present invention), and the diaphragm pushes up using the bearing as a guide. A push rod is used to press the button on the micro switch, closing the switch and issuing an alarm. This is because air containing water, dust, etc. enters and exits from the pressure equalization pipe due to pressure changes due to temperature changes in the upper diaphragm chamber, and the air gets stuck between the push rod and the bearing, causing the push rod to stop moving. It entered the microswitch chamber through the gap in the bearing, causing insulation failure in the microswitch. Considering the above points, the present invention uses a proximal body, a reed switch, and a relay, so that the relay chamber can be sealed, and the gap between the outer diameter of the reed switch and the inner diameter of the proximal body can be increased.
In addition, moisture, dust, etc. that accumulate in this gap can be discharged from the groove at the lower end of the proximal body, making it possible to eliminate the causes of the above-mentioned defects.

The present invention will be explained in detail with reference to the drawings.

In FIG. 1, 21 and 22 are power supplies. 1 is a lid that is tightened onto the relay chamber 4 with a bolt 2 through a gasket 3, a screw lid 8 that tightens the outer diameter of the wire and the bottom of the wire port through a gasket 6, and an O-ring 25. , reed switch 26
When the screw is screwed toward the upper diaphragm chamber 9, its head is tightened to the bottom of the relay chamber 4, and both serve to make the relay chamber 4 airtight. The relay stand 24 is attached to the bottom of the relay room 4 and serves as a mounting stand for the relay 23. The relay 23 includes, as shown in FIG.
A reed switch 26 is connected to a power source through an operating coil 29, and its common terminal 30 is connected to the power source.

The relay 23 is energized when current flows from the reed switch 26 to the operating coil 29, and the movable contact 31
operates, opening the normally closed contact 32 and opening the normally open contact 33.
is closed as shown by the dotted line. Alarm device 34
is connected to the normally open contact 33 and the power supply.

The diaphragm 12 has an upper body 5 and a lower body 13.
It is held in between and tightened with bolt 15,
increases when there is pressure in the lower diaphragm chamber 16,
When there is no pressure, it returns to its original state.

On top of the diaphragm 12 is a stopper 10, and above it is a proximal body 27 which houses a permanent magnet 28 in its upper part, has a groove A in its lower end, and whose inner diameter moves around the outer diameter of the reed switch 26. It's glued. The proximal body rises together with the diaphragm 12, and when it rises to the operating position B-C of the reed switch 26 shown in FIG. 2, it closes the switch built in the reed switch. The inner diameter of the proximal body is made larger than the outer diameter of the reed switch within a range in which the reed switch can be operated. The groove A is for discharging moisture, dust, etc. that accumulates in the gap between the inner diameter of the proximal body and the outer diameter of the reed switch. Equalizing pressure pipe 1
1 has an open end, and is used to balance the pressure on the diaphragm 12 with the outside air pressure.

A detection tube 19 is screwed into the center hole of the projection 14 of the lower body communicating with the lower diaphragm chamber 16, and a fluid tank 18 is screwed onto the outer diameter of the projection 14. The upper side wall of the fluid tank is connected to a leakage fluid generation section (not shown) via a pipe 17, and a valve 20 is provided below.

The fluid tank 18 is for storing leaked fluid flowing in from the pipe 17.

The level of fluid in the fluid tank increases and the detection tube 19
When the lower end is reached and the level rises further, since the lower diaphragm chamber 16 at the upper end of the detection tube is sealed by the diaphragm 12, the level in the detection tube 19 is lower than the level in the fluid tank, and therefore the detection tube The pressure in 19 becomes higher than the pressure in fluid reservoir 18. The detection tube 19 transmits this pressure to the lower side of the diaphragm 12 via the lower diaphragm chamber 16. The valve 20 is for discharging the fluid in the fluid tank 18.

Next, the operation of the present invention will be explained.

Fluid leaking from the leakage fluid source passes through the pipe 17 and enters the fluid tank 18, where it accumulates. The level of this fluid reaches the lower end of the detection tube 19, and the fluid further reaches the fluid tank 18.
This creates a difference between the fluid level in fluid reservoir 18 and the fluid level in detection tube 19 .

When this level difference reaches a certain value, that is, when a certain pressure is reached, the upper diaphragm chamber 9
1, the diaphragm 12 is pushed upward by this pressure.

Therefore, the pad 10 and the proximal body 27 bonded thereon rise simultaneously, and when the proximal body 27 rises to the operating position B-C of the reed switch 26 shown in FIG. 2, the reed switch 26 is closed. When the switch is closed, the electric circuit of the reed switch 26, which is connected to the power supply through the operating coil 29 of the relay, is closed, current flows through the operating coil 29, and the movable contact 31 becomes the normally closed contact 32. is opened and the normally open contact 33 is closed as shown by the dotted line.

Therefore, the alarm 3 connected to the normally open contact 33
Since the electric circuit 4 is also closed, the alarm device 34 can issue an alarm.

As explained above, the level detection device of the present invention has the advantage of being able to seal the relay room by using a reed switch and a proximal body, eliminating damage to the relay from moisture and dust; The effect is that the gap can be made larger so that moisture and dust no longer get stuck in this gap, allowing the nearby object to move lightly at all times, and the effect that moisture and dust in this gap are discharged from the groove at the bottom end of the nearby object. , it is very useful as a device for early detection of a failure in the leakage fluid generating section by detecting an abnormal leakage flow rate of the fluid.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a level detection device according to the present invention. However, the reed switch part is not cut out. FIG. 2 is an electrical circuit diagram of the device.

Claims (1)

[Scope of utility model registration request] A pressure equalizing tube 11 with an open end is screwed onto the side wall of the upper diaphragm chamber 9, the wire port 7 on the side wall of the relay chamber 4 is sealed with a screw cap 8 via a packing 6, and the upper part of the relay chamber 4 is sealed with a packing 3. A relay stand 24 with a relay 23 is attached to the bottom of the relay chamber 4, and an O-ring 2 is attached to the bottom of the relay chamber 4.
5, the reed switch 26 is screwed toward the upper diaphragm chamber 9, and a stopper 10 is placed on the diaphragm 12, and a groove A is provided on the lower end of the stopper 10 so that the outer diameter of the reed switch 26 can be freely moved. Possible melee body 2
7, the diaphragm 12 is sandwiched between the upper body 5 and the lower body 13 and tightened with bolts 15, and the detection tube 19 is screwed into the center hole of the protrusion 14 of the lower body that communicates with the lower diaphragm chamber 16. However, on the outer diameter of the protrusion 14, a leakage fluid generating part (not shown) and the upper side wall are connected by a pipe 17, a fluid tank 18 having a valve 20 is screwed to the lower part, and a separate alarm 34 is connected to the outer diameter of the protrusion 14. The electric circuit of the alarm 34 is connected to the power sources 21 and 22 through the normally open contact 33, movable contact 31 and common terminal 30 of the relay, and the electric circuit of the reed switch 26 is connected to the power source through the operating coil 29 of the relay. The circuit constitutes a circuit that controls the alarm 34, and when the leaked fluid flowing into the fluid tank 18 from the piping 17 reaches a certain level, the pressure causes the adjacent body 27 on the diaphragm 12 to operate the reed switch 26. A level detection device characterized by pushing up to a certain position, closing a switch, and emitting an alarm.