JPS5815722Y2 - electromagnetic control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic control device designed to reduce power consumption and prevent burnout of the renoids.

When a well is drilled at relatively deep water depth, such as from the ocean floor,
It is often desirable to drill and complete wells on the ocean floor using equipment that can be controlled remotely from the equipment on the water surface.

A number of these devices, which may include blowout blockers, hydraulic coupler buttons, and valves, are used to control different functions for a single well.

Typically, these devices are remotely operated by pressurized fluid controlled by appropriate operation of a pilot valve operated by a liquid.

When the renoid is energized, the pilot valve is opened and
Pressurized liquid is directed into the device.

In the past, the apparatus for controlling the energization of each pilot valve's lenoid or electromagnet included a relatively high operating potential power supply and a switch that selectively directed a high potential to the electromagnet.

Thus, by operating the switch, the electromagnet was energized to open or otherwise actuate the valve and operate the device.

Sometimes it is necessary to keep the device in operation for long periods of time.

In such a case, the high electrical potential introduced into each lenoid continues to maintain the pilot valve in an activated or open condition.

However, under relatively high energizing potentials, all previously used pilot valves consumed 360 knots of power.

Generating electricity in a well located on the ocean floor far from land is expensive, and the high power consumption of each valve is correspondingly expensive.

This problem has been addressed by increasing the number of pilot valves in each well.

For example, a typical installation containing seven pilot valves has historically consumed approximately 2500 watts of power.

Transferring this power to remote locations such as the ocean floor requires expensive lines.

High power consumption poses a risk to pilot valve reliability; when energized for extended periods of time, the renoids, or electromagnets, can overheat, become unreliable, and cause damage.

Of course, if the pilot valve is damaged, it will need to be replaced.

The present invention solves the above-mentioned problems by applying high power only when urging the valve member from the first operating position to the second operating position, and then returning the valve member to the second operating position. The purpose of holding the valve member is to use a small amount of electric power to hold the valve member, thereby reducing power consumption and preventing burnout of the lenoid coil. and a second relay are installed in parallel, a first power source with a low potential is connected to the Nrenoid coil via the first relay, and a second power source with a high potential is connected to the Nlenoid coil via the second relay. The present invention is characterized in that the first and second relays are selectively excited by a switch to supply power to the renoid coil.

A number of liquid-powered devices, blowout preventers, hydraulic connectors, valves, etc. are used to satisfactorily construct a well on the ocean floor.

One such liquid-operated device 11 is diagrammatically depicted in FIG.

The completed control sheath 13 is suitable for attaching an assembly 15 of elevated liquid conduits extending from and connected to a suitable source, such as a submerged borer.

The assembly includes a telescoping flexible tube 19 button and an electrical lead 17 for controlling the operation of the liquid operated device 11.

Flexible tube 19 directs the liquid at the desired pressure to pilot valve 21 within sheath 13. The control valve 31 is adapted to lead to the system and the liquid-operated device 11 itself.

Pilot valve 21 is connected to line 17 and communicates with flexible tube 19 and provides means for controlling the flow of liquid to liquid-operated device 11 .

This pilot valve is connected to a control valve 31 which in turn controls the flow of liquid through assembly 15 to device 11 and flexible tube 19.
Control the flow of liquid to.

In practice, a plurality of sets of pilot valves 21, control valves 31, and liquid-operated devices 11 are placed on the ocean floor and control various functions of the well extending down from the ocean floor.

However, for ease of illustration, a single set of pilot valves, control valve buttons, and fluid actuators will be illustrated.

The control sheath 13 includes a main body 12 having a flow passage 14 connected to a flexible tube 19 for directing pressurized liquid to a supply port 25 of a pilot valve 21 .

This supply port communicates with a channel 25a on the inlet side of the outer body 25b, which is connected to a channel 6 in the pusher 67a in an opening 67b arranged radially in the inner valve body 25c.
1, the pusher is provided for a radial shear seal 25d extending inwardly of the valve body 25c, and a gate valve movable along its length within the inner valve body. 59 on the upstream side 59a.

The pusher is actuated to be forced inwardly by the liquid pressure in the inlet channel 25a and is held in liquid-tight relation to the shear seal 25d, causing the shear seal to move upstream of the gate valve. 59a.

Pilot valve 21 is shown in FIG. 2 in a closed position and vertical flow passage 61 extending through gate valve 59 is offset from shear seal 25d.

The gate valve is in the closed upper position as shown in FIG. It is placed.

The gate valve 59 has a lower stop shoulder 202 which is movable relative to the lower layer 203 of the inner valve body 25c, as described below, and which is connected to the flow path 61 traversing through the gate valve.
This affects the positional relationship between the inlet shear seal 25d and the outlet shear seal 204 held on the downstream side 205 of the gate valve and the flow path 61, but the shear seal 2
04 is pressed against a radially arranged pusher 206 provided in the valve body 25c, and the liquid passes through the shear seal 204 button and the pusher 206 to the outlet 2.
9, and the outlet 29 communicates with an outlet passage 29b extending to the control valve 310 inlet 39.

The gate valve 59 is in the upper or closed position (second
In FIG. 2, the liquid in the outlet channel 29a is discharged downstream through the pusher 206 and the shear seal 204 into a discharge channel 63 provided in the gate valve.

This discharge channel opens into an outlet channel 27a in the valve body 25c extending at the outlet 2γ1, which channel may extend at a suitable location, such as at the surface of the water or before the drilling platform (not shown). ) is in communication.

In order to facilitate the movement of the gate valve 59, which is plate-like, between its closed and open positions, its downstream face 205 is inserted into the valve body 25c, for example with the aid of a needle bearing (as shown). 1) supported by spaced rollers 65 placed for proper rotation.

The liquid mocha in the inlet side channel 25a and on the upstream side 59a of the gate valve thus presses the latter against the roller 65, and the structure between the downstream face of the gate valve and the roller is forced into its closed position. and facilitate movement of the gate valve between the open position.

The lower part 220 of the gate valve is cylindrical and the inner valve body 2
It is designed to be able to slide inside the hole 221 in 5c.

Similarly, the upper part of the valve is also cylindrical, and the adapter 20
0, the upper cylindrical part of which is suitably fixed, for example by a transverse pin 229, to a stem 69 which operates the valve.

The outer stem is arranged inside the electromagnet 41 and fixed to the adapter 200.

The electromagnet includes an outer magnetic core 51 which is mounted on a ramp 54 on a flange 55 of an inner magnetic core 52 which is supported within the outer core 51 on shoulders 55a.
It is fixed to the core 52 by a screw 53 that is in contact with the core 52.

An electromagnetic coil 47 is placed between the inner core and the outer core, which coil is connected to the conductor 17, which passes through the assembly 15 to the operating location of the canteen drilling vessel or platform! It is extending.

The pilot valve 21 is initially in the closed position 1 depicted in FIG.
The lower end of the spring 5T is supported by the shoulder 56 of the inner core 52 to press the button, and the upper end is supported by the magnetic plunger 53a to press the button. The plunger 53a is attached to the upper end of the stem 69 by a screw or other suitable means,
Plunger 53a is secured therein by a suitable set screw 240 threaded onto the stem.

When the circuit to the lenoid coil is open, the spring 57 pushes the valve stem 69 and plunger 53a to the distal position, forcing the plunger's inner sloped end 241
are spaced a predetermined distance apart from the inclined end 242 of the inner core 52 with a gap 55a therebetween.

The sleeve 243 is secured between the upper end of the outer core 51 and the upwardly facing shoulder 244 of the inner core 52, with a suitable clearance between the circumference 245 of the plunger 53a and the sleeve.

When the circuit to the lenoid coil 47 is formed, the plunger 53a is pulled inward to move the gate valve 59 to an open position where the lateral flow passage 61 coincides with the shear seals 25d, 204.

This position is determined by the contact between the stop shoulder 202 and the shoulder 203 of the inner valve body 25c.

The gap 55a between the plunger 53a and the inner core 520 is now considerably reduced.

By way of example, the gap 55a is approximately 0.51 cm prior to energizing the electromagnet, but when the electromagnet is energized, the gap 55a is approximately 0.08 cm.

In accordance with the particular pilot valve thus illustrated, it is initially arranged in a closed position when the electromagnet is not energized;
When energized, it is moved to the open position and held there.

The control valve 31 is a pilot valve discharge passage 29a.

29b and a hole 301 interlocked with the liquid operated device 1
1, an outlet 302 communicating with a channel 37a provided in the body 12, and a supply port 303 communicating with a source of liquid flowing from the high pressure flexible tube 19 through the channel 14 in the body.
, and a valve body 30 having an outlet 304 communicating with a discharge passageway (not shown) extending into a suitable discharge passageway (not shown).
Contains 0.

A displaceable valve body 305 is movable within the valve body 300 and is connected to the outlet 304, the outlet 302, and the supply outlet 30.
It extends across 3.

As shown, the supply port 303 is closed, but the flow path 37a leading to the liquid-operated device 11 is closed.
Flow passages 310, 310a, 310b in the flexible valve body communicate with the outlet 304 as shown in FIG.

The valve body 305 is moved and held in this position by a helical pressure spring 311 located inside the valve body housing 300a.

The outer part of the spring rests on the wall 312 of the housing, the inner part of the spring rests on a head 313 secured to the movable valve body 305 by screws or other suitable means, and the spring rests on the shoulder 312 of the valve body. is brought into contact with the strough shoulder 315.

At this time, the channels leading to and from the liquid-operated device 11 are in a drained state, so that no pressurized liquid is supplied to the device 11.

The vertical passage 61 is connected to the shear seal 2.
When energized to pull inward the plunger 53a which acts to move the gate valve 59 through the valve stem 69 to the open position of the valve, consistent with 5d, 204, the pressurized liquid flows into the outlet stream. A bore 30 that communicates with an end 320 of the head of a cylinder 321 containing a piston 322 of a valve body 305 which is flowable and movable through passages 29a, 29b.
flows through 1.

The pressurized liquid moves the valve body 305 to the right by pressing the button in FIG. 3 in order to communicate the flow path 310a with the inlet 303 and the flow path 310b with the outlet 302 of the control valve 31.

This position corresponds to the shoulder 325 of the valve body 305 and the closing part 3 of the control valve.
27 and the shoulder 326.

The liquid under pressure then flows through the flexible tube 19 or the supply port 3.
03, and then the flow path 310a of the valve body.

310.310b to outlet 302 and then through channel 37a to liquid-operated device 11.

Demagnetizing the electromagnet 41 causes the spring 57 to move the pilot valve to the initial position where the liquid passage 29b29a communicates with the discharge passage 2γa through the discharge passage 63 in the gate valve 59. .

The pressure of the limb in the cylinder 321 then decreases and the flow path 37a leading to the liquid powered device 11
2,310a.

The force of the spring moves the valve body 305 to an initial position where it communicates with the outlet 304 button and the outlet passage through 310, 310b.

Both the pilot valve and the control valve are provided with suitable seal rings as shown to prevent leakage of fluid between the parts.

The present invention moves the plunger 53a into the pilot valve with less power than is required to move the plunger 53a in the position where the flow path 61 coincides with the shear seals 25d, 204, that is, in the open position 1 of the pilot valve 21. The content is that the valve is held at the open position of 21.

Initially, a large amount of electric power is required to displace the plunger 53a, but in order to hold the displaced plunger 53a in the position where the pilot valve 21 is opened, a fairly small value is sufficient.

For example, at the beginning of displacing the plunger 53a, approximately 3
00 watts of electric power is required, but it has been found that only about 2 watts of electric power is sufficient to maintain the displaced plunger 53a at position 1, which opens the pilot valve 21.

It appears to be particularly advantageous to reduce the power to the coil 47 after the device 11 has been initially activated.

This not only reduces power consumption, but also reduces heat generation inside the pilot valve 21.

An electrical circuit 71 having these advantages is shown in FIGS. 4-7.

The electric circuit 71 has a first power source 73 button and a second power source T5.

The voltage of the first power supply T3 is 24 volts, and the voltage of the second power supply T5 is 90 volts.

7γ is a switch means, and the switch means γT connects the renoid coil 47 to a high voltage (90 volts) or a low voltage (
24 volts) and turn on the power supply γ3, 7.
5.

The switch means γ7 includes a coil 81 and a first contact 83.
and a first relay 79 having a second contact 85, a coil 89 and a third contact 91 and a fourth contact 93.
A second relay 37 is provided.

First contact 83, second contact 85 button and fourth contact 93
are each normally open contacts, and the third contact 91 is a normally closed contact.

A first switch 95, whose contacts are normally open, is connected between the first power source 73 and the coils 8F and 89, and when the contacts of switch 95 are closed, the first relay T is connected.
9 and the second relay 8T are each excited by a low voltage first power source 13.

The coil 81 is connected to the first contact 83 and the first contact 8
3 is a second switch 9γ whose contacts are normally closed;
The first power source 73 is connected to the first power source 73 via the first power source 73 .

The conductor 99 connects the first power source γ3 and the second contact 85, and similarly the conductor 101 connects the second contact 85 and the third contact 91.

Third contact 91 is connected to connector 45 via conductor 17 .

The third conductor 103 connects the second power source 75 and the fourth contact 93 to press the button, and the fourth contact 93 is connected to the connector 45 via the conductive wire 17.

The above-mentioned structural features provide the switch means 77 with at least four operating states.

The first operating state is shown in FIG.

That is, the contacts 83, 85, 93 of the switch means γ7 are open, the contact 91 is closed and the button 9 and the switch 9 are closed.
The contact of switch 5 is open, and the contact of switch 97 is closed.

Therefore, neither the power source 73 nor the power source 75 is electrically connected to the solenoid coil 47 by the switch means 7γ, and the coil 41 is in a non-energized state.
Therefore, the pilot valve 21 button and the control valve 31 are in the discharge state, and the device 11 is in the inactive state.

A second operating state is shown in FIG.

That is, when the first switch 95 is closed, the coils 81 of the first relay 79 and the second relay 87 are closed.
．． 89 is excited.

Therefore, the first contact 83, the second contact 85, and the third contact 93 are closed, and the third contact 91 is opened.

This means that the second power source 75 connects the conductor 103 and the fourth contact 9.
The coil 4γ is electrically connected to the solenoid coil 47 via the conductor 17 and the coil 4γ.

When the coil 47 is energized, the plunger 53a is displaced to open the pilot valve 21, and the fluid under pressure flows into the valve body 305, opening the control valve 31. , the fluid under pressure passes through the flexible tube 1
9 to the device 11 through channels 14 and 3γa to operate the device 11.

A third operating state is shown in FIG.

That is, as soon as the external force on the switch 95 is removed and its contacts return to the open position, the coil 89 of the second relay 8γ is demagnetized, the third contact 91 is closed, and the fourth Contact 93 returns to the open state.

However, the coil 81 of the first relay T9 becomes the energized 11 via the switch 97 and the first contact 83, and the second discharge point 85 becomes the closed 11.

The power supply γ3 is then connected to the conductor 39, the second contact 85, and the conductor 10.
1. It is electrically connected to the solenoid coil 47 via the third contact 913 and the conductor 17, and the solenoid coil 4γ
is excited by the low voltage power supply 73, and the granger 53a is activated by the magnetic force of the solenoid coil 47.
1 is held in a position that maintains the valve open.

Therefore, the device 11 can be operated without overheating the pilot valve 21.
can continue to operate for a long time.

A fourth operating state is shown in FIG.

That is, the contacts of switch 97 are opened to demagnetize coil 81.

As a result, the first contact 83j=- and the second contact 85
returns to the open state, the third contact 91 returns to the initial closed state, and the fourth contact 93 returns to the open state.

Therefore, no current is applied to the solenoid coil 47 from the power source γ3 or the power source 15.

Although the operating procedure is simple, the electrical circuit 71 provides significant advantages in the operation of the electromagnet 41.

This is because the plunger 53a is first displaced to put the device 11 into operation, so the coil 47 is continuously excited by the high voltage power source 75.

If the coil 4T is excited with a high voltage and the plunger 53a is held in the open position of the pilot valve 21 in this way, the pilot valve 21 will become overheated.

However, as soon as the plunger 53a moves to the open position of the pilot valve 21 and the contacts of the switch 95 are opened, the electrical circuit 71 is activated to hold the plunger 53a in the open position of the pilot valve 21. , the low voltage first power source 73 is automatically connected to the coil 47.

Therefore, the magnitude of the current applied to the solenoid coil 47 of the electromagnet 41 is reduced, and power consumption is significantly reduced.

In the example shown above, power consumption is reduced from 300 watts to just over 2 knots when using a single pilot valve.

With the reduction of the power in the coil 4T, the risk of damage to the pilot valve 21 due to overheating is eliminated, and the useful life of the pilot valve 21 is significantly increased, as is its reliability.

A decrease in the current value means that the conductor 17 through which the current flows
reduce the size of

This is especially important when power is transmitted to locations such as the ocean floor.

As described above, the present invention connects a first low-potential power source to the lenoid valve via the first relay, and connects a high-potential second power source to the lenoid valve via the second relay, activating the second relay to operate the valve member with high power only when the switch urges the valve member from the first actuated position to the second actuated position, and thereafter maintains the valve member in the second actuated position; By activating the first relay, it requires less power to operate, which not only reduces the power consumed by the solenoid coil, but also requires less power to be supplied to the solenoid coil to hold the valve member in place. This has the effect of preventing overheating and preventing burnout of the renoid coil.

Embodiment 1 A button on a device causing operation of a liquid-operated device, valve means operatively connectable to a source of liquid pressure as well as the device, preventing the flow of liquid from the source of liquid to the device. said valve means comprising a valve body movable between a first position button and a second position permitting flow of liquid from the liquid source to the device;
electrically actuated means operatively connected to said valve body for moving said valve body from one of said positions to another of said positions, a power supply; means for supplying a first specific value of electrical power to said electrically actuated means for causing movement of said valve body from said one position to said other position; Apparatus including means for supplying electrical power to the actuated means and for supplying a second specified value of electrical power which is significantly less than said first value to maintain said valve means in said other position.

Embodiment 2. Apparatus according to embodiment 1, including switch means for selectively connecting said electrically actuated means to said first value of electrical power or to said second value of electrical power when pressed.

Embodiment 3 A power means comprising a first power supply for providing a first value of power and a relatively high potential by pressing the button on the device of Embodiment 1, a power means comprising a first power source for providing a power of said first value and a relatively high potential; power means comprising a second power source providing a relatively lower electrical potential; means for switching said electrically actuated first power source of said higher potential to move said valve means to said other position; Apparatus including switch means for connecting said second low potential power supply to said electrically actuated means for later selective connection or for retaining said valve body in said other position.

Embodiment 4 For the apparatus of embodiment 3, a first relay selectively energizable by a lower potential for conducting a higher potential by electrically actuated means; and a second relay energizable to conduct a lower potential by electrically actuated means, and a second relay connected to a lower potential source and such that the lower potential is conducted to the second relay. a first normally open switch operable to simultaneously energize the first and second relays, and means for continuing the current after the first switch is opened to reduce the power consumed; Apparatus comprising switch means for continuing electrical current from a lower potential through the second button and the first relay to the electrically actuated means and for continuing the valve body in said other position.

Embodiment 5 The apparatus of embodiment 1, wherein said one of said positions is said first position and said other one of said positions is said second position.

Embodiment 6 The apparatus of embodiment 1, wherein said one of said positions is said first position and said other one of said positions is said second position, said electrically actuated means being enclosed. Apparatus comprising switch means for selectively connecting said power to said first value of power or to said second value of power.

Embodiment 7 In the apparatus of Embodiment 1, the one of the positions is the first position and the other one of the positions is the second position, and the power of the first value is a power means comprising a first power source that provides a relatively high potential at said second value; a second power source that provides a second value of power that is relatively lower than said high potential; and a switch means. selectively connecting said first power source of a higher potential to said electrically actuated means for moving said valve body to said second position or said valve body to said second position; switch means for connecting said second power source of lower potential to said electrically actuated means for holding the body.

Embodiment 8 The apparatus of embodiment 7 is buttoned to include a first relay selectively energizable by a lower potential for conducting a higher potential to the electrically actuated means; a second relay which is energizable for conducting a lower potential to the electrically actuated means and a second relay which is capable of conducting a higher potential to the electrically actuated means; a normally open switch operable to simultaneously energize the switches, as well as a second switch and a normally open switch operable to energize the first relay from a lower potential after the first switch is opened to reduce the power consumed. and means for maintaining the valve body in said second position.

Embodiment 9 For an apparatus for effecting operation of a liquid-operated apparatus, a valve means operatively connected to a source of liquid pressure and to the apparatus, a first tap button and a stopper button that prevents the flow of liquid from the source to the apparatus. said valve means comprising a valve body movable between second positions for permitting the flow of liquid from a source to the device; an electromagnet having a coil; said valve body from one of said positions to another of said positions; a plunger connected to said valve body for moving said plunger from an extended position spaced apart from said electromagnet to a position in substantially closer proximity to said electromagnet; a first specific 1' on said coil causing movement of said plunger to a proximate position;
and means for powering the coil to a second specified value substantially less than the first value to maintain the granger in the proximate position. Device.

Embodiment IO Embodiment 90 An apparatus comprising switch means for buttoning the appliance to selectively connect said coil to said first value of power or to said second value of power.

Embodiment 11 In the apparatus of embodiment 9, the power means comprises a first power source for providing a first value of power and a relatively high potential; power means comprising a second power supply providing a relatively lower potential than the first high potential power supply for moving said plunger from said extended position to said proximate position; and a switch for selectively connecting the plunger to the coil or for connecting the second low potential power source to the coil to maintain the plunger in the proximate position.

Embodiment 12 The apparatus of embodiment 11 is buttoned to include a first relay selectively energizable by a lower potential to introduce a higher potential to the coil; a second relay operable to energize the first and second relays connected to the lower potential source and to simultaneously energize the first and second relays such that the lower potential is directed to the second relay; a switch that is normally opened and the first switch continues to conduct current through the second and first relays to the coil from a lower potential after being opened to reduce the power consumed; and means for maintaining the pusher in said proximate position.

Embodiment 13 The apparatus of Embodiment 9, wherein said one of said positions is a recitation-th position and said other one of said positions is said second position.

Embodiment 14 In the apparatus of Embodiment 9, the one of the positions is the first position and the other one of the positions is the second position, and the coil is placed in the first position. Apparatus including switch means for selectively connecting to a value of power means and to said second value of power means.

Embodiment 15 In the apparatus of Embodiment 9, said one of said positions is said first position and said other one of said positions is said second position, and said one of said positions is said second position; said first value power means comprising a first power source that provides a potential, said second value power means comprising a second power source that provides a relatively lower potential than said high potential; and means for switching said selectively connecting the first power source at a higher potential to the coil for moving the plunger to the proximate position or the second power source at a lower potential to hold the plunger in the proximal position; switch means for connecting a power source to said coil.

Embodiment 16 The apparatus of embodiment 15, comprising: a first relay selectively energizable by a lower potential to conduct a higher potential to the coil; a second relay capable of energizing OT to conduct, and first and second relays connected to a power supply at a lower potential and such that the lower potential is conducted to the second relay and the higher potential is conducted to the coil. i5T capable of simultaneously energizing the first normally open switch and the second and first relays from a lower potential after being opened to reduce the power consumed by the first switch. and means for continuing the flow of current through the coil and maintaining the plunger in said proximate position.

[Brief explanation of the drawing]

Figure 1 is a side exploded view of the completed control sheath containing the control valve that determines operation and the pilot valve, Figure 2 is a vertical cross-section of the pilot valve depicted in Figure 1, and Figure 3 is the same diagram as depicted in Figure 1. FIG. 4 is a conceptual diagram of a control circuit for electrically operating the pilot valve. However, the arrangement of the control circuit relates to the first mode of operation. FIG. 5 is a conceptual diagram of the control circuit depicted in FIG. 4, and the arrangement is for the second mode of operation. FIG. 6 is a conceptual diagram of the control circuit depicted in FIG. 4, and the arrangement is for the third mode of operation. FIG. 7 is a conceptual diagram of the control circuit depicted in FIG. 4, and the arrangement is for the fourth mode of operation. , 11... Liquid operated device, 15... High pressure liquid line assembly, 19... Flexible pipe, 21... Pilot valve, 31... Control valve, 69... Stem, 4
7... Lenoid coil, 53... Screw, 57...
・Spring, 59...Gate valve.

Claims (1)

[Scope of utility model registration request] connect the lenoid coil to a high voltage second power source through the fourth normally open contact of the second relay, and connect the lenoid coil to the third normally open contact of the second relay and the second a first power source at a low potential through a normally open contact of the first relay, the coil of the first relay is connected to the first power source through a normally open first switch; A coil of the relay is connected to the first power source through the normally open first switch, and the coil of the first relay is connected to the first normally open contact of the first relay and the normally closed first switch. An electromagnetic agent suppressing device, characterized in that it is connected to the first power source via a second switch.