JPH0443781Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Purpose of the invention [Field of industrial application] This invention relates to the improvement of a full-water detector attached to a seawater pump.

[Prior Art] This type of water pumping work is performed by, for example, operating a pump 2 by driving a motor 1 as shown in FIG.
Level coat roller 3 for river lake water or groundwater
When discharging water into the water tank 4, which is controlled by
Confirm that the tank is full of water, and if it is not full, open the automatic on-off valve 5, operate the vacuum pump 6, and pump up the pump 2 until it reaches the upper limit level of the full water detector A. When it is detected that the vacuum pump 2 has been pumped up, the automatic on-off valve 5 is closed and the vacuum pump 6 is also stopped at the same time, and the system is designed so that the pump 2 can be started for the first time when the motor 1 is started.

In the unlikely event that the inside of the pump 2 is empty, if the pump 2 is started, the pump blades (not shown) will rotate at an overaccelerated rate, causing abnormal operation and causing a failure.

However, the internal structure of the conventional full water detector A of this type is as shown in FIG.
The electrode detection rod 7 has a simple structure in which the electrode detection rods 8 and 9 are attached to the top plate 10' of the detector main body 10 and hang down inside.
and 8, and the adjacent interval d between 8 and 9 was about 3 cm.
However, the full water detector A was designed primarily for pumping up fresh water such as rivers, lakes, marshes, or underground water, so when it was attached to the pump 2 for pumping seawater, various problems occurred. .

In other words, in conventional full water detectors, water enters directly from the inlet from the bottom plate, so when the vacuum pump operates, the water bubbles vigorously and becomes a jet of water, which often causes the electrode detection rod to falsely detect the water. did. In addition, since the detector body 10 was made of cast iron, it had poor durability due to seawater corrosion, and seawater scale α easily adhered to the top plate 10' as shown in the imaginary line, causing short circuits and false detection. This causes a malfunction, which disturbs the control of the entire system, making it impossible to manage the seawater level in tank 4, which is the ultimate goal, and having a negative impact on the equipment, making it necessary to replace the full water detector A within a short period of time. It didn't happen. The biggest cause of this is that the seawater β is salt water, which corrodes the cast iron casing, and at the same time creates conductive scale α. As a result, foaming and disturbance occur, and as shown in Fig. 6, the seawater surface γ makes large waves, and as a result, the crest of the wave comes into contact with the top plate 10', which inevitably causes the top plate 1
It has been found that this is because the scale α is deposited and stacked on the electrode detection rods 7, 8, and 9, and that the fact that the distance d between the nearest adjacent electrode detection rods 7, 8, and 9 is about 3 cm further aggravates this problem.

[Problems to be Solved by the Invention] The present invention aims to provide a full-water detector for a seawater pump that overcomes and solves the drawbacks of conventional full-water detectors for freshwater pumps.

(2) Structure of the invention [Means for solving the problem] The seawater pump full-water detector of the present invention has electrode detection rods of different lengths on the top plate of the detector body attached to the seawater pump. The upper guide pipe passes through the top plate part and hangs down inside on a concentric circle with the nearest adjacent interval being about 10 cm apart, and the lower guide pipe is installed in the bottom plate part of the detector main body. A pipe is protruded through the pipe, and the upper opening is inserted into the large-diameter lower opening of the upper guide with a slight gap to suppress foaming and disturbance phenomena on the seawater surface when the seawater is pumped into the detector body. This causes the sea level to rise quietly.

[Example] A first embodiment of the present invention will be described with reference to FIG.

The full water detector B of the seawater pump of the present invention is attached to one side of the top plate of the pump pump 2 through a pumping pipe 11 that penetrates through the lower part, using joint flanges 12 and 13, and the detector body is made of vinyl chloride. For the lower limit, stainless steel dull nuts 16 and 17 were respectively screwed onto the upper ends of each of vinyl chloride electrode holders 15 which were arranged concentrically and penetratingly on the top plate part 14a' of 14 with the closest adjacent interval l about 10 cm apart. ,
It penetrates the intermediate and upper limit stainless steel electrode detection rods 18, 19, and 20 and hangs down inside, while an upper guide pipe 21 made of vinyl chloride is attached to the center of the top plate part 14a' along the axis. A lower guide pipe 22 made of vinyl chloride is installed vertically inside the detector main body 14 along the axis at the center of the bottom plate 14a' and protrudes from the upper opening 22a.
The large diameter portion 21 is connected through the tapered portion 21a.
(b) The axes thereof are aligned with each other in the lower opening 21c, and a circumferential gap γ is opened so that they are slightly inserted into the lower opening 21c.

The detector main body 14 is divided into upper and lower halves 14a, 14b, which are connected by connecting bolts 23 and nuts 24 to joining flange parts 14a'', 14b'' provided on the outer periphery.
It exhibits a structure.

In the figure, 25 is a rubber gasket, 26 is a gasket holder, and 27 is an upper opening 21d at the outer end of the upper guide pipe 21.
The joint flange 21f is an air vent hole, which is attached to the vacuum pipe 28 and is coupled to the joint flange 29 attached to the end of the vacuum pipe 28.

A second embodiment of the present invention will be described with reference to FIGS. 2 to 4.

The full water detector C of the seawater pump according to the present invention includes an upper guide pipe 30 that includes a plurality of members 30a, 30b, 30c.
The reinforcing pipes 31 and 32 can be fitted inside and joined together, or the detector body 33 can be divided into upper and lower halves 33.
a, 33b structure may be replaced with the joining flange portions 14a'', 14b'' of the first embodiment by inserting a reinforcing pipe 34 made of vinyl chloride, or attaching a screw portion 35a to the outer periphery of the lower end of the lower guide pipe 35. The same members are designated by the same reference numerals in the same manner as in the first embodiment except that they are threaded to form a screw-in type.

In addition, in the embodiment of this proposal, the detector main body 14,
33 has a structure in which it is divided into upper and lower halves, but it may be an integral structure.The full water detectors B and C of the present invention are connected to the suction pipe 11 as shown by the imaginary line at the discharge port 2a of the pump pump 2.
There is no problem in installing it through the .

[Function] Since the present invention is constructed as described above, the pump 2 is activated before the pump 2 shown in FIG.
When it is empty, the electrode detection rods 18, 19, and 20 do not detect seawater β because the full water detectors B and C are also empty, so the automatic opening/closing valve 5 is opened and the vacuum pump 6 is operated to create a vacuum. The pipe 28, the full water detectors B and C, the pumping pipe 11, the pumping pump 2, and the pumping pipe 36 are brought into a vacuum state, and the seawater β is pumped up from the pipe 36.
Fill pump 2 with water and pump pipe 1.
1, the seawater β rises and fills the lower guide pipe 2.
2, 35 starts to flow into the detector bodies 14, 33, but at this time, the bubbling and disturbance of the seawater β that is vigorously injected from the upper openings 22a, 35a of the lower guide pipes 22, 35 is caused by the upper guide pipes 21, 30. The lower ports 21c and 30d enclose and suppress the sea level γ, and in order to suppress its spread throughout the detector bodies 14 and 33, the sea level γ rises quietly and undulations are suppressed as much as possible. Since the wave crest does not touch the plate parts 14a', 33a', there is almost no adhesion of the scale α on the top plate parts 14a', 33a' due to contact with seawater, and when the upper limit electrode detection rod 20 is touched by the seawater level γ, it is automatically activated. Close the on-off valve 5 and stop the vacuum pump 6,
At the same time, the motor 1 is started to drive the pump 2.

Conversely, when the sea level γ falls below the lower end of the lower limit electrode detection rod 18, the automatic on-off valve 5 is opened, and the vacuum pump 6 is activated in advance of the motor 1 with or without receiving the command from the level controller 3 of the water tank 4. Start.

(3) Effects of the invention In this way, the present invention uses the action of the upper and lower guide pipes to suppress foaming and disturbances on the seawater surface, and to minimize the occurrence of cross-linking and short circuits caused by conductive scale adhering to the top plate. Combined with the recently increased spacing between adjacent units, there is no risk of false detection or malfunction even after long-term use, and it is reliable, making it possible to smoothly assist and support seawater pumping system control.The detector body is divided into upper and lower halves. Therefore, the inside can be inspected and cleaned regularly, and the full water detector has excellent practicality and usefulness, such as being corrosion resistant and durable when exposed to salt water.

[Brief explanation of the drawing]

Fig. 1 is a central vertical sectional view showing the first embodiment of the present invention, Figs. 2 and 3 are plan views and side views of the same and second embodiments, and Fig. 4 is a central longitudinal sectional view of the first embodiment of the present invention. 5 is a diagram of a pumping system to which the present invention is applied, and FIG. 6 is a central vertical sectional view showing a conventional example of a full water detector. A, B, C... Full water detector, l... Nearest adjacent interval, 14, 33... Detector body, 14a, 14
b, 33a, 33b...upper and lower halves, 14a', 3
3a'...Top plate part, 14b'...Bottom plate part, 18,1
9, 20... Electrode detection rod, 21, 30... Upper guide pipe, 21a... Taper part, 21b... Large diameter part, 21c, 30d... Lower mouth, 22, 35...
Lower guide pipe, α...Scale, β...Seawater,
γ...Sea level.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Electrode detection rods of different lengths are penetrated at predetermined positions in a concentric circle on the top plate of a detector body made of seawater corrosion-resistant material that is attached to a seawater pump with effective short-circuit prevention intervals. An upper guide pipe made of a material resistant to seawater corrosion is penetrating through the top plate portion and hanging inside, and a lower guide pipe made of a material resistant to seawater corrosion is protruded through the bottom plate portion of the detector body. The upper opening is formed to have a large diameter through the tapered part of the upper guide pipe, and the lower opening is opened with a circumferential gap to allow a small amount of internal insertion to freely suppress foaming and waving caused by stirring and turbulence of the inflowing seawater. Full water detector for seawater pumps. 2. The full water detector for a seawater pump according to claim 1, wherein the electrode detection rods are spaced apart from each other by approximately 10 cm. 3. The full water detector for a seawater pump as set forth in claim 1 or 2 of the utility model registration claim, wherein the detector body has a structure in which the upper and lower halves are joined.