JP3110858B2 - Immersion type water level transmitter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a immersion type water level transmitter for measuring a water level by submerging a detector having a built-in pressure sensor in water to be measured and transmitting the measurement result.

[0002]

2. Description of the Related Art FIG. 8 shows a conventional water-immersed water level transmitter for measuring the water level by submerging in water to be measured and transmitting the measurement result.

The immersion type water level transmitter shown in FIG. 1 has a built-in pressure sensor, a detector 101 to be immersed in water to be measured, and the detector 101 which guides the atmospheric pressure on the ground side to the detector 101. A cable 102 for guiding the pressure value measured by the sensor 101 to the ground, and an atmospheric pressure which is arranged on the ground and is supplied to the detector 101 via the cable 102 and the detector 101 via the cable 102. And a converter 103 which takes in the measurement result, converts it into a transmission signal of a predetermined format, and transmits the transmission signal, and measures a change in water level by using a pressure sensor provided in the detector 101 to measure the change. The signal is converted into a predetermined electric signal by the transmitter 103 and transmitted.

[0004]

However, in the above-mentioned conventional flood water level transmitter, the housing of the detector 101 is made of a material such as stainless steel, so that the water level in ordinary water or sewage can be reduced. It does not corrode when used, but, for example, when used in seawater, there is a problem that the stainless steel is corroded and normal measurement cannot be performed.

Therefore, in order to solve such a problem, it is conceivable to form the housing of the detector 101 with a corrosion-resistant material such as Monel or the like, but such a method would increase the manufacturing cost too much. A problem arises.

[0006] The present invention has been made in view of the above circumstances, the use of detectors of a standard material such as stainless steel, to corrosion
It facilitates maintenance and management of liquids to be prevented , and measures the level of corrosive fluids such as seawater at low cost over a long period of time.
It is an object of the present invention to provide a flood-type water level transmitter capable of realizing a fixed measurement .

[0007]

In order to achieve the above-mentioned object, a flood-type water level transmitter according to the present invention comprises a detector body submerged in water, a converter provided on the ground, and a converter provided on the ground. A cable for connecting the detector body ,
It has a protective bag attached to wrap the detector body.
A water level transmitter having a liquid filled in a protective bag, wherein the protective bag is provided with two openable and closable stoppers.
It is characterized in that was.

[0008]

In the above configuration, since the entire detector body is surrounded by the protective bag made of an anticorrosive soft member made of polyethylene or the like, corrosion is avoided even when used in seawater. Is done. Also, by opening and closing the two stoppers, the liquid
The maintenance and management of water is easy, and the water level of corrosive fluids such as seawater can be measured at low cost and stable over a long period of time.
To achieve.

[0009]

FIG. 1 is a block diagram showing an example of a detector used in a first embodiment of a projection type water level transmitter according to the present invention.

[0010] The detector 1 of the immersion type water level transmitter shown in this figure has a detector main body 2 and a flexible sealing portion 3 surrounding the detector main body 2, and is supplied via a cable 4. A differential pressure between the atmospheric pressure and the pressure applied to the detector main body 2 via the flexible sealing portion 3 is detected, and the detection result is transmitted to a ground-side transmitter (not shown) via the cable 4. And let it be processed.

As shown in FIG. 2, the detector main body 2 has a case 5 in which a cavity 9 is formed, a pressure receiving diaphragm 6 provided in a lower portion of the case 5, and a pressure sensor 6 provided slightly above the lower portion of the case 5. Partition plate 7 formed integrally with case 5
A filling liquid 8 filled in a cavity 9 b formed by the partition plate 7, the pressure receiving diaphragm 6, and the side surface of the case 5; A pressure sensor 12 in contact with the sealed liquid 8 through an opening 10 formed in the plate 7 and the other surface in contact with atmospheric pressure air supplied through an atmospheric pressure introducing pipe 11 of the cable 4; And drives the pressure sensor 12 to perform pressure measurement, captures a differential pressure signal obtained by this measurement operation, and transmits the signal via the signal line 13 of the cable 4 to the differential pressure transmitter. And a sensor driving circuit board 14 for transmitting the atmospheric pressure supplied through the atmospheric pressure introducing pipe 11 of the cable 4 into the cavity 9a.
2, the pressure applied to the pressure receiving diaphragm 6 is guided to one surface of the pressure sensor 12 through the filling liquid 8 to measure these differential pressures, and a differential pressure signal obtained by this measuring operation is obtained. The signal is transmitted to the differential pressure transmitter via the signal line 13 of the cable 4.

As shown in FIG. 1, the flexible sealing portion 3 is a ring-shaped seal portion 15 attached to a portion of the cable 4 close to the detector main body 2, and the flexible sealing portion 3 is configured to wrap the main body of the detector main body 2. A bag 16 made of a soft member made of polyethylene or the like attached to the side surface of the seal portion 15, two plugs 17a and 17b for opening and closing two openings formed on the top of the bag 16, and
A liquid 18 such as pure water to be filled in the bag 16, the plugs 17 a and 17 b are opened to remove air from one of the plugs, and pour the liquid 18 such as pure water from the other into the bag. After sealing and sealing the inside 16 with the liquid 18,
Each stopper 17a, 17b is closed, thereby causing the liquid 18
Wraps the entire detector main body 2.

In this case, since the bag 16 is formed of a soft member made of polyethylene or the like, when the detector 1 is submerged in a corrosive fluid such as seawater, the water pressure applied to the bag 16 is applied via the liquid 18. Pressure receiving diaphragm 6 of detector body 2
And the differential pressure can be detected, and the corrosive fluid can be prevented from directly touching the detector main body 2.

As described above, in this embodiment, the bag 16 made of an anticorrosive soft member made of polyethylene or the like is used.
The detector body 2 is wrapped by the
Is filled with the liquid 18, so that even if the detector main body 2 made of a standard material such as stainless steel is used, it can be prevented from corroding, whereby the water level of the corrosive fluid such as seawater can be reduced. Measurement can be realized at low cost.

FIG. 3 is a block diagram showing an example of a detector used in a second embodiment of the projection type water level transmitter according to the present invention. In this figure, the same parts as those in FIG. 1 are denoted by the same reference numerals.

The difference between the detector 1b shown in this figure and the detector 1 shown in FIG. 1 is that the shape of the ring-shaped seal portion 20 inserted into the cable 4 is enlarged, and an opening is formed in the seal portion 20. At the same time, a bag 21 having no plug is attached, and two openings are formed in the seal portion 20, and plugs 22a and 22b are provided in each of these openings.
The liquid 18 is filled in the bag 21 via the a and 22b.

With this configuration, the liquid 18 can be easily sealed in the bag 21 and the bag 2 can be easily sealed.
The liquid 1 sealed in the bag 21 by reducing the shape of the liquid 1
8 can be reduced.

FIG. 4 is a block diagram showing an example of a detector used in a third embodiment of the projection type water level transmitter according to the present invention. In this figure, the same parts as those in FIG. 3 are denoted by the same reference numerals.

The detector 1c shown in this figure is different from the detector 1b shown in FIG. 3 only in that the mechanical part 23 provided on the upper side of the detector main body 2 is made of a corrosion-resistant material, and a ring is attached to the mechanical part 23. The seal portion 24 is inserted.

With this configuration, the airtightness of the seal portion 24 can be improved and the leakage of the liquid 18 can be eliminated.

FIG. 5 is a block diagram showing an example of a detector used in a fourth embodiment of the projection type water level transmitter according to the present invention. In this figure, the same parts as those in FIG. 3 are denoted by the same reference numerals.

The detector 1d shown in this figure is different from the detector 1b shown in FIG. 3 in that a weight stand 25 is disposed in the bag 21 and connected to the detector main body 2, and the bag 26
Is made larger.

With this configuration, the detector 1
d can be easily submerged in seawater or the like.

FIG. 6 is a block diagram showing an example of a detector used in a fourth embodiment of the projection type water level transmitter according to the present invention. In this figure, the same parts as those in FIG. 3 are denoted by the same reference numerals.

The difference between the detector 1e shown in this figure and the detector 1c shown in FIG. 3 is that tubes 27a and 27b which can be opened and closed at respective openings provided in the seal portion 20 by means of plugs or the like. Is attached, and the other end of each of the tubes 27a and 27b is guided to the ground side.

With this configuration, the liquid 18 in the bag 21 can be discharged from the ground side to the one tube 27a and the liquid 18 in the bag 21 can be discharged from the other tube 27b. When the liquid passes through the bag 21 and enters the liquid 18, the liquid 18 sealed in the bag 21 can be exchanged without raising the detector 1e to the ground side.

In the first to fourth embodiments, the detector main body 2 shown in FIG. 2 is used. However, the detector main body 2b shown in FIG. 7 may be used. .

The detector main body 2b shown in this figure is formed in a cylindrical shape with a cavity 30 formed therein and a closed upper part.
A case 31 in which a plurality of holes 34 for communicating the inside and outside are formed at a lower side thereof; a porous sintered metal plate 32 provided so as to close an opening at a lower side of the case 31; A pressure receiving diaphragm 33 provided slightly above the portion, a partition plate 35 formed integrally with the case 31 slightly above the lower portion of the case 31, a partition plate 35, the pressure receiving diaphragm 33, and the case 31.
A filling liquid 36 filled in a cavity 30b formed by the side surface of the partition plate 35, and an opening 37 formed on the side of the partition plate 35 on the cavity 30a side and having one surface formed in the partition plate 35.
And a pressure sensor 38, which is in contact with the air at atmospheric pressure supplied through the atmospheric pressure introducing pipe 11 of the cable 4 on the other side, and the pressure sensor 38 which is disposed in the cavity 30a. And a sensor drive circuit board 39 for taking a differential pressure signal obtained by the measurement operation and transmitting the signal to the differential pressure transmitter via the signal line 13 of the cable 4. ,
And a skirt portion 41 having a plurality of slits 40 provided obliquely slightly above the lower portion of the case 31 to supply the atmospheric pressure supplied through the atmospheric pressure introducing pipe 11 of the cable 4 into the cavity 30a. The pressure applied to the pressure receiving diaphragm 33 is guided to one surface of the pressure sensor 38 via the filling liquid 36 while the pressure is applied to the other surface of the pressure sensor 38, and the differential pressure between them is measured. The differential pressure signal to be applied
3 to the differential pressure transmitter.

When the bags 16 and 21 enclosing the detector main body 2b come into close contact with the lower portion of the detector main body 2b, the plurality of slits 40 formed in the skirt portion 41 are formed.
Further, the water pressure applied to the bags 16 and 21 can be guided to the pressure receiving diaphragm 33 through the plurality of holes 34 formed in the case 31.

[0030]

As described above, according to the present invention, the inspection
The output unit is entirely covered by a protective bag filled with liquid.
Because it is surrounded, corrosion is avoided. In addition, fluid maintenance and
The management becomes easy, and the water level of corrosive fluid such as seawater can be measured at low cost and can be stably measured over a long period of time .

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of a detector used in a first embodiment of a projection type water level transmitter according to the present invention.

FIG. 2 is a cross-sectional view showing a detailed configuration example of a detector main body shown in FIG.

FIG. 3 is a configuration diagram showing an example of a detector used in a second embodiment of the projection type water level transmitter according to the present invention.

FIG. 4 is a configuration diagram showing an example of a detector used in a third embodiment of the projection type water level transmitter according to the present invention.

FIG. 5 is a configuration diagram showing an example of a detector used in a fourth embodiment of the projection type water level transmitter according to the present invention.

FIG. 6 is a configuration diagram illustrating an example of a detector used in a fifth embodiment of the projection type water level transmitter according to the present invention.

FIG. 7 is a sectional view showing an example of another detector main body used in the projection type water level transmitter according to the present invention.

FIG. 8 is a configuration diagram showing an example of a conventionally known projection type water level transmitter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Detector 2 Detector main body 3 Flexible sealing part 4 Cable 16 Bag (protective bag) 18 Liquid

Claims (1)

(57) [Claims] 1. A detector body submerged in water, a converter provided on the ground side, a cable connecting the converter to the detector body, and a cable surrounding the detector body.
With a protective bag to be applied, and a liquid filled in the protective bag.
A water level transmitter including a body , wherein the protective bag is provided with two openable and closable stoppers .