JPS6031394Y2 - Oil amount monitoring switch device in oil tank for oil-filled cables - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil amount monitoring switch device in an oil tank for oil-filled cables.

As is known, the oil tank for oil-filled cables (OF cables) can be of internal oil/outside gas type, internal oil/outside oil/outside gas type, internal/gas/outside overnight type, or
There are various types such as gravity type.

Several examples of the various oil tanks mentioned above are shown in FIG.

In the case of Figure 1 A, which is an internal oil external gas type, the oil tank 1
has a built-in bellows-type cell A that is expandable and retractable in the vertical direction, and internal oil B is accommodated within the cell A, and the remaining space of the oil supply layer 1 is filled with external gas C.

In addition, the oil supply tank 1 at the entrance in Figure 1 is of an oil-inside-outside-oil-outside-gas type.
It has built-in palm-shaped cells a, a, a..., and in this case, each cell a, a, a...
In addition to housing the internal oil B described above, the oil tank 1 is also filled with oil and external gas C.

Furthermore, the gravity type refueling tank 1 shown in FIG. It is accommodated.

By the way, in the case of the fuel tank 1, the height of the cell, the height of the oil level, etc. are monitored to detect oil leakage accidents and issue alarms based on this. Oil amount monitors generally turn on and off using changes in the height of the cell, changes in the oil level, and the like.

Conventionally, as this type of switch device,
701-What was shown in the official gazette (first conventional example), Utsuko Kosho 4
What is shown in Japanese Utility Model Publication No. 2-383 (second conventional example), what is shown in Japanese Utility Model Publication No. 43-18857 (third conventional example), what is shown in Japanese Utility Model Publication No. 44-18288, etc. Various types of prior art already exist.

However, in the first, second, and fourth conventional examples, the above-mentioned switch device is installed inside the fuel tank, so when a failure occurs in the switch device, the fuel tank must be partially disassembled each time. Moreover, since the seesaw movement of the swinging rod that opens and closes the switch is performed in the liquid, the movement is slow and lacks stability.

On the other hand, in the third conventional example, a vertical liquid level gauge that communicates with several types is provided on the side of the liquid layer, and a float equipped with a magnet is installed vertically within the liquid level gauge (cylindrical). It is movably housed inside and is equipped with a proximity switch outside the liquid surface that is closed by the magnet.

In this third conventional example, the float follows changes in the liquid level well, so it has sufficient responsiveness, and the proximity switch, which is closed by the float's magnet, is located outside the liquid tank, so it can be easily used in the event of a failure. Repairs and parts replacement are also easy.

However, in the case of the above-mentioned proximity switch, since the distance between the contact points of the switch element is extremely small, about 20 μm, there are many cases of malfunctions such as the switch element being closed involuntarily, and as a result, alarms may occur even though the switch is normal. There is a problem with the circuit working.

In view of the above-mentioned problems, the present invention is an improvement of the oil amount monitoring switch device in a refueling tank for oil-filled cables by utilizing the concept of the third conventional example. do.

In Fig. 2, reference numeral 1 denotes the oil tank 1 in Fig. 1 A. In the oil tank 1, which has a built-in bellows-type cell A, the height changes as the oil amount changes on the oil-filled cable side. Cell A is employed as the changing section 2.

At the side of the oil tank 1, a guide chamber 3 of a corbel type communicating with the type 1 is vertically formed in the upper part thereof.

4 is interlocked with the above-mentioned changing part 2, and this interlocking part 4 made of a cable is connected to the upper surface of the cell A (changing part 2), the upper part of the guide chamber 3, and the inside of the guide chamber 3 via the sheaves 5 and 6. A weight-shaped switch operating body 8 equipped with a switch operating element 7 made of a permanent magnet is attached to the end, that is, the lower end of this interlocking part 4, and is suspended. .

Furthermore, in FIG. 2, 9H and 9L are switch mechanisms of an oil amount monitor (not shown) equipped with an alarm circuit, etc., and one switch mechanism 9H is used when the amount of oil in the oil tank 1 approaches the upper limit. An alarm circuit is activated to notify this, and when the oil level approaches the lower limit, the other switch mechanism 9L activates an alarm circuit to notify this. Therefore, one of the switch mechanisms 9H is disposed outside and below the guide chamber 3.
The other switch mechanism 9L is arranged above the above.

Both switch mechanisms 9H and 9L are adopted for this purpose.
Appropriate examples include those shown in FIGS. 3 to 6, or those within the scope of these design changes.

First, let's explain from Figures 3 and 4. Figure 3 shows the upper limit switch mechanism 9H, and Figure 4 shows the lower limit switch mechanism 9L, but these configurations are almost the same. .

In Figures 3 and 4, 10 is a switch box;
1 is a horizontal support arm 11b having a vertical through hole 11a;
The support stand 12 has rotation regulating pieces 12a, 12 at both ends.
13 is a horizontal actuating piece having rotating ends 13a and 13b at both ends that alternately move up and down; 14 is a pair of electrical contacts in an elongated small body 14a; 1
A switch (mercury switch) in which 4b and 14c are inserted and a small amount of mercury 14d is also accommodated, and 15 is a U-shaped connecting part 15b at both upper and lower ends of the shaft part 15a, and a retaining part 15.
16 is a holder.

In the above, a support stand 11 is arranged at the inner bottom of the switch box 10, a bearing 12 is attached to the upper surface of the support stand 11, and the actuating piece 13 has a shaft pin that becomes the support part 17. The rotating end 13a of the actuating piece 13 is pivotally supported by the bearing 12 through the
is directed toward the outside of the guide chamber 3.

On the other hand, the switch 14 is attached to the upper surface (or the lower surface) of the actuating piece 13, and in this case, the center of gravity of the actuating piece 13 is positioned on the vertical axis passing over the fulcrum 17, or the center of gravity is The mounting position of the switch 14 on the actuation piece 13 is set so as to be located on the opposite side of the electrical contact portions 14b and 14c.

On the other hand, in the elevating piece 15 in which at least the suction part 15d is made of a magnetic material such as metal, the shaft part 15a is the supporting arm 11b.
The connecting portion 15b is movable up and down in the state where the connecting portion 15b penetrates through the rotary end portion 13a of the actuating piece 13.
By engaging with it, it is in a state of connection with it.

The switch mechanism 9H shown in FIG. 3 and the switch mechanism 9H shown in FIG. 4 have slightly different configurations in the following points.

First, regarding the switch 14, in the switch mechanism 9H, the electrical contact portions 14b and 14c are on the right side in the drawing, and the mercury 14d is on the left side, whereas in the switch mechanism 9L, these are reversed.

Regarding the holding tool 16 made of a permanent magnet or the like, in the switch mechanism 9H, the rotating end of the actuating piece 13 that has changed upward (
The holder 16 is attached to a predetermined inner surface of the switch box 10 in order to attract the magnetic material) 13b, but in the switch mechanism 9L, the rotating end 1 of the actuating piece 13 displaced downward
3b, the holder 16 is attached to the switch box 10
is attached to a predetermined inner surface of the

Furthermore, regarding the compression type spring 18 used for the purpose of preventing the elevating piece 15 from wobbling, etc., in the switch mechanism 9H, it is interposed between the support arm 11b and the connecting part 15b, but in the switch mechanism 9L, the support arm 11b
and the retaining portion 15c.

Next, switch operation when the oil tank 1 shown in FIG. 2 is equipped with the switch mechanisms 9H and 9L shown in FIGS. 3 and 4 will be described.

In normal times, one rotating end 13a of the operating piece 13 in the upper limit switch mechanism 9H is connected to the lifting piece 15.
It rotates upwards as it moves up and down, and the other rotating end 13b rotates downwards relative to this.

Therefore, in this switch mechanism 9H, the mercury 14d in the small body 14a of the switch 14 is biased toward the left end as shown in FIG. 3, and its discharge electrical contacts 14b and 14c are opened.

Further, in the switch mechanism 9L for the lower limit, the electrical contacts 14b and 14c are opened in the opposite state to the above.

In such a state, the bellows type cell A, that is, the changing part 2
When the is expanding and contracting vertically within the normal range, the switch operating body 8 moves up and down via the interlocking section 4 that interlocks with the changing section 2.
is located in the guide chamber 3, and both switch mechanisms 9H and 9L are located inside the guide chamber 3.
Therefore, under normal conditions, both switch mechanisms 9H and 9L move up and down without exceeding the range between
There are no changes.

However, if an accident occurs on the oil-filled cable side and the changing portion 2, that is, the cell A, abnormally expands or contracts abnormally, the switch mechanisms 9H and 9L operate as follows.

First, when the cell expands abnormally, the upper surface of the changing section 2 becomes higher than normal, so that the switch operating body 8 moves below the switch mechanism 9H, and at the time when it passes through the switch mechanism 9H. The switch operation body 8 uses the switch operation element 7 made of a permanent magnet to attract the suction portion 15d of the lifting piece 15 and lower them as shown by the phantom line in FIG. Since the rotating end 13a is rotated downward, the mercury 14d inside the switch 14, which was on the left side in FIG. will be accomplished.

As a result, the alarm circuit of the oil level monitor is activated and an alarm is issued to notify of the abnormality.

Furthermore, in the event of abnormal cell contraction, the switch operating body 8 will move beyond the switch mechanism 9L and move above it.
At this time as well, the switch operating element 7 displaces the lifting piece 15 from the state shown by the solid line in FIG.
5 displaces the actuating piece 13 as shown by the phantom line in the figure, and the accompanying flow of mercury 14d causes the electrical contact portion 14b to displace.
, 14C are closed and the same alarm as above is issued.

Of course, the switch operating element 7 in the above is the lifting piece 15.
, the actuating piece 13 has a magnetic force that can move the actuating piece 13, and the actuating piece 13 in the states shown by the dotted line in FIG. 3 and the dotted line in FIG. be done.

Note that the holder 16 is placed at the position shown in FIG. 3 and FIG.
Alternatively, the suction and holding may be performed.

Of course, the holder 16 may be omitted.

Next, a modified example of the switch 14 will be explained with reference to FIG. 5. In this illustrated example, a known microswitch is used as the switch 14 instead of a mercury switch, and the switch opening/closing piece 14' is connected to the actuating piece 13. The switch 14 is attached to the inner upper surface of the switchbot 10 so that it can be struck.

In the case of FIG. 5, the above-mentioned spring 18 may be installed as shown in FIG. 3 or as shown in FIG. By attaching it to the inside of the switch mechanism 10, it can become either the switch mechanism 9H or 9L described above.

To describe another example of modification, when the switch operation element 7 of the switch operation body 8 is made of a magnetic material such as metal,
The elevating piece 15 is partially or entirely made of magnets, and if it is partially made of magnets, the suction part 1 of the elevating piece 15
A magnet will be attached to 5d.

Furthermore, if a magnet is attached to the rotating end portion 13b, the holder 16 shown in FIGS. 3 and 4 may be made of a magnetic material.

Next, the embodiment shown in FIG. 6 will be explained. The one shown in this figure is an embodiment based on the fuel tank 1 at the entrance in FIG.
A discharge type guide chamber 3 is vertically formed on the side of the oil supply tank 1 and communicates with a gas phase section above the tank 1 and a liquid phase section below it.

In this embodiment, the overhang in the fuel tank 1 serves as the changing section 2, and furthermore, a part of the overhang is provided inside the guide chamber 3, which becomes the interlocking section 4.

The switch operating body 8 used in this embodiment is a float type equipped with a switch operating element 7 made of a permanent magnet.
The switch operating body 8 is disposed within the guide chamber 3, and is connected to the interlocking section 4.
It is floated and supported by the upper end (liquid level) of.

On the other hand, on the outside of the guide chamber 3, the switch mechanism 9H shown in FIG. 3 is provided below, and the switch mechanism 9L shown in FIG. 4 is provided above the outside.

In the embodiment shown in Fig. 7, abnormal drop or rise of the liquid level in the changing part 2, that is, the liquid level in the overnight stay, is monitored by the pull pull, and here, 9H is the switch mechanism for the lower limit, and 9L is the upper limit switch mechanism. It operates as a switch mechanism for

At each abnormality, the switch operating body 8 operates the switch mechanisms 9H and 9L as described above due to the liquid level fluctuations in the changing part 2 and the interlocking part 4.
Based on this, a warning will be issued.

Note that the exchangeability of the permanent magnet and the magnetic body in this embodiment is the same as in the case described above, and the switch mechanism 9H
, 9L can all be adopted as described above.

Furthermore, the oil supply tank 1 in FIG. 1 also uses oil B, and can be equipped with a switch device for monitoring the oil amount in the same manner as in FIG.

As explained above, according to the device of the present invention, there is a changing part inside the oil tank whose height changes as the oil amount changes on the oil-filled cable side. A sliding guide chamber is formed in the vertical direction and communicates with the guide chamber, and the guide chamber has an interlocking section whose end changes in height in conjunction with the changing section, and is movable vertically by the end of the interlocking section. In an apparatus in which a switch operating body supported by the guide chamber is installed inside the guide chamber, and a switch mechanism of an oil level monitor that is opened and closed by the switch operating body is provided outside the guide chamber.
The switch operating body includes a switch operating element made of a permanent magnet or a magnetic material, and the switch mechanism includes:
A vertical lifting piece that has a suction part that attracts each other to the connecting part and the switch operating element and is movable up and down, and a rotating end part that can be rotated up and down by a fulcrum part, and the rotary part It includes a horizontal actuation piece whose end is connected to the connecting part of the lifting piece, and a switch whose electric contact part opens and closes in conjunction with the actuation piece, and the suction part of the lifting piece is connected to the connecting part of the lifting piece. It is characterized by being placed close to the outside of the guide room.

Therefore, in the case of the present invention, since the switch mechanism is located outside the oil tank, even if it should break down, it can be easily repaired, and the actuating piece located outside the oil tank is completely unaffected by the movement of the changing part during normal times. First, since the switch is activated only through the switch operating body in the event of an abnormality, the switch can be opened and closed stably, and there is no malfunction unlike a proximity switch that is activated in a minute area.

[Brief explanation of the drawing]

Figure 1 A9 and C are schematic explanatory diagrams of various oil tanks, Figure 2 is a sectional view showing one embodiment of the device of the present invention, and Figures 3 and 4 show the switch mechanism in the same embodiment. FIG. 5 is an explanatory diagram showing a different example of the same switch mechanism, and FIG. 6 is a schematic sectional view showing another embodiment of the present invention. 1... Oil supply tank, 2... Changing part, 3...
...Information room, 4...Interlocking section, 7...
・Switch operation element, 8...Switch operation body,
9H, 9L...Switch mechanism, 13...
- Operating piece, 13a...Rotating end, 14...
...Switch, 14'...Switch opening/closing piece, 1
4b. 14c...Electrical contact portion, 14d...Mercury, 15...Elevating piece, 15b...Connection part, 15d...Suction part, 17... fulcrum part, A... bellows type cell, B... inner oil, D... outer sleeper.

Claims (1)

[Scope of Claim for Utility Model Registration] l Inside the oil tank, there is a changing part whose height changes as the oil level changes on the oil-filled cable side, and the side part of the oil tank has a part that communicates with the tank. A portable guide chamber is formed in the vertical direction, and within the guide chamber there is an interlocking part whose end height changes in conjunction with the changing part, and an end of the interlocking part that supports vertical movement. In a device in which a switch operating body is installed inside the guide chamber, and a switch mechanism of an oil level monitor that is opened and closed by the switch operating body is provided outside the guide chamber, the switch operating body is made of a permanent magnet or a magnetic material. The switch mechanism includes a vertical elevating piece that has a connecting part and a suction part that attracts each other to the switch operating element and is movable up and down, and a fulcrum part that moves up and down. A horizontal actuation piece having a freely rotatable turning end, the turning end being connected to a connecting part of the lifting piece, and an electric contact part being opened and closed in conjunction with the actuation piece. An oil amount monitoring switch device for an oil supply tank for an oil-filled cable, comprising: a switch, and a suction part of the lifting piece is disposed close to the outside of the guide chamber. 2 The changing part in the fuel tank is a bellows-type cell, and the interlocking part consists of a cable roped over the top surface of the cell and the lower part of the upper guide chamber in the guide chamber. An oil amount monitoring switch device for an oil supply tank for an oil-filled cable according to claim 1, wherein a weight-shaped switch operating body is suspended. 3. The oil according to claim 1 of the utility model registration, wherein the changing part in the oil tank and the interlocking part in the guide chamber are made of an outboard, and a float-type switch operating body is supported via the liquid level in the guide chamber. Oil amount monitoring switch device in the oil supply tank for incoming cables. 4. The switch consists of a mercury switch, and the switch is attached to the actuating piece.
An oil amount monitoring switch device in a oil supply tank for oil-filled cables as described in 2. 5. The oil amount monitoring switch device for an oil tank for oil-filled cables as set forth in claim 1 of the utility model registration claim, wherein the switch is a microswitch, and the switch is arranged near the actuating piece so as to be able to collide with the actuating piece. .