DE1790034C3 - Metal-enclosed pressure gas switch - Google Patents

Description

Safety valve (29) a spring (30) which overpressures the 35 ^ £ ^

Safety valve (29) loaded in the closing ^{direction , the gas in the H} ~ hd ™ ^ ^m "^ _re X _c J ^e ^ and a double-acting piston (31), low pressure ^{chamber v} ? ^ Next to overpressure or that the piston (31) in the opening direction of the up to a zu.niedriger ^'h ° ^he ™ ⁰ ^ f ^ fj ^ safety valve constantly increases with the gas pressure. Since the gas in the spaces ^ of the meter low-pressure space (18 19, 20) is loaded that 40 gleicnzeitig ^ ^{the Iso1} * ^ "^ ίΧ ^ 2 ™ ί the side of the coming parts that can be acted upon in the closing direction, ^ rdd« Isolation by the piston (31) of the safety valve (29) by reducing the pressures in these spaces to undnenKanaf (35) and a changeover valve (37) below the permissible low pressure, either with the outside air or with the start-up.

45 The invention is based on the object of driving the switching valve a spring (43) and a piston that, by reducing the (44) too large, causes the switching valve (37) to pass through Pressures in the high-pressure chamber and / or in the low-pressure chamber, the spring (43) can be brought into the position in which the pressure chamber prevents the insulation in _{these chambers being} too low on the side of the pressurized in the closing direction. .. ".. ,, _

Piston (31) of the safety valve (29) with the 50. According to the invention, this object is thereby achieved (17) is in connection and solves that in the drain channel between low pressure the piston (44) of the switching valve (37) space and check valve lying safety valve the gas pressure in the high pressure chamber (17) is arranged in til that the safety valve is a Fedie Can be brought into position in which the closing direction that exposes the safety valve in closing direction impactable side of the piston (31) 55 steadily, and has a double-acting piston, the safety valve (29) with the outside air in that the piston in the opening direction of the safety connection stands. valve constantly with the gas pressure of the low-pressure

rauir.es is loaded that the acted upon in the closing direction Side of the piston of the safety valve 60 via a channel and a switching valve either

with the outside air or with the high pressure room

connected is that the switch valve has a spring and a piston that the switch valve

The invention relates to a metal-enclosed by the spring can be brought into the position in which Compressed gas switch, which is used exclusively to interrupt the side of the piston that can be acted upon in the closing direction a circuit is used, with a metal vessel bens the safety valve with the high pressure chamber and an isolated therein arranged switching element, is in communication and that the piston of the Umdas through a switching valve filled with gas under excess pressure through the gas pressure in the high pressure

can be brought into the position in which the in Atm. amounts to. The low pressure spaces 18, 19, 20 are

^ ihT * «direction acted upon side of the piston in the stationary state of the switch with the same

c-safety valve with the outside air in connection- insulating gas under lower pressure p, filled,

* ^{es S} T: _h ; the e.g. 5 atm. amounts to. All rooms within the

For this design of the gas pressure switch 5, vessel 1 thus contain insulating gas

• H in the event of a malfunction, there is too much gas loss due to excess pressure. By using gas under Jh prevents the safety valve from becoming overpressure, the insulation value of the gas filling

"ff et is when the pressure in the high-pressure chamber and is greatly increased, and as a result the isolieren-Üj pressure in the low-pressure chamber can have values that make the distances in the switch smaller, S" h Άϊ for the security of the insulation in the- io than if only gas under atmospheric pressure is required, but is used immediately. This means, however, that if the pressure in one of these excess pressures of the insulating gas falls unnecessarily, the insulation of the parts of the switch which come under voltage to below the relevant dangerous voltage drop will normally be sufficient Danger of an earth fault is opened and the non-return valve ensures that 15. The gas is not the pressure in the low pressure chamber or in the high pressure chamber 17 through a line 22 to the UR and the pressure low pressure chamber 18,19 through a line 23 to the round closed switching contacts. 20. • High pressure space to below the one for the isola- During the switch-off process, the moving-

• Pulled up in the low-pressure chamber and for the insulation in the switching contact piece 6, so iwhriruckraurn dangerous value can fall, ao that it is separated from the fixed pipe contact piece 4 and The high-pressure chamber 17 with the low-pressure chamber is now not only activated immediately Sh o'-sen when the pressure in the low-pressure chamber is 18, 19, 20 put into open connection. Strong.

• Very low for the insulation, but also, gas flows to extinguish the Shah arch flow Ιΐηη the pressure difference between the two rooms, then out of the high pressure chamber through the pipe connection too low for the switch to work _{properly * 5} clock pieces 4, 5 through to the Rooms 18, IV oxr men door a g _b expansion chambers 9, 10 and from there through the

It is noted that from the Swiss Pa pipes 21 through to room 20, so that the pressure tentsrhrift 3 80 801 a pressure gas switch is known, decreases in the high pressure chamber and the pressure in the S is also ensured that the gas pressures in the low pressure chamber 18, 19 , 20 increases The N.eder-Siund in the high pressure chamber through 30 pressure chamber 20 is provided with a drain channel 24 so low. This takes place in the stationary state of the switch by a pressure gauge and a signal device, which is loaded by a spring 25 and is closed by means of a large, slow-acting valve. The spring 25 .st ^ ^Ste £

Detour. The simple solution according to the invention screw 27 in this way TSbe how to front the switch to large 35 low pressure room 18 19 20

can protect is ai, this patent holding ™ d *% <^^ $ ££ on the ^ as ^ Ssch.agventil 26. -d

^cut . 53KSSTViC SSK Ä ^f

the circuit is characterized ™ H ~ hf ckraum forth remote pressure ^dUrd \ ^d ^ ^e l _eze ichie0 so S

£ dÄSS ^ d ^ to the under-

break the circuit, certain compressed gas

remains through an insulating rod 7 with a drive or leaks so much, rod 8 is connected. The fixed R.hrkontaktstucke 50 n.chi .mjande ^ 4, 5 are each supported by a metallic expansion 18 i9, 20 on the

_{pressure brown} ,

Sruck p, _{hardly too hal}

, en leite. 15, 16 to connect the SchaUer to the

S «de. SCaHe.

after the Au ₅ -

10 surrounds, is then separated from denN.ederdruckraumenιΐβ, 19, 20, which are located within the expansion chambers 9, IC and above the expansion

SJJShi. I _n this case could, "^ erg _{to below the}

^ li lowest pressure

dl - /, "cation _im sch ⁸ a" e. _e e, _ä h.de, we.

im a

switched on state of the switch e.g. 15 den.

In order to avoid this danger, a safety valve 29 is arranged, which has the effect that the discharge channel 24 is closed when the pressures in the high pressure chamber 17 and in the low pressure chamber 18, 19, 20 up to the values p, '+ Ap ₁ and p _t ' + Ap ₂ , ie decrease to values which are a little above the lowest permissible values p / and p ₂ 'and in the present case, for example, 11 atm. and 3.85 atm.

For this purpose, the safety valve 29 is loaded by a spring 30 and coupled to a double-acting piston 31 which is arranged in a double-acting cylinder 32. The cylinder chamber 33 of this cylinder is in open connection with the low-pressure chamber 18, 19, 20, and the cylinder chamber 34 of this cylinder is connected by a line 35 to the chamber 36 of a switching valve 37, which in the illustrated end state of the cylinder chamber 34 via the line 35, the chamber 36 and an opening 38 connects with the outside air and in the other end state the opening 38 closes and this cylinder space 34 via the line 35, the chamber 36 and an opening 39 with the effective cylinder space 40 of a single-acting cylinder 41 with a through a spring 43 loaded by an adjustable screw 42 and connected to the high pressure chamber via a channel 45.

The spring 30 and the piston 31 are dimensioned such that when the gas pressure in the low-pressure chamber 18, 19, 20 is higher than p ₂ ′ + Ap ₂ , the force exerted on the piston 31 is greater than the force of the spring 30. If, however, this gas pressure falls below the value p ₂ '+ Ap ₂ ', the force of the spring 30 is greater than the force exerted on the piston 31, so that the safety valve 29 is pushed upwards and the discharge channel 24 is closed.

The spring 43 is set and the piston 44 is dimensioned so that when the gas pressure in the high pressure chamber is higher than P ₁ + Ap ₁ ' , the force exerted on the piston 44 is greater than the force of the spring 43, so that sets the switchover valve 37 to the state shown, ie the opening 38 to the outside air is opened and the opening 39 to the cylinder chamber 40 and to the high-pressure chamber 17 is closed. If, however, the pressure in the high pressure chamber drops below the value P ₁ + Ap ₁ , the force of the spring 43 becomes greater than the force exerted on the piston 44, and the switching valve 37 is switched over so that the opening 38 closes and the opening 39 is opened.

This has the consequence that the cylinder chamber 34 below the piston 31 is connected to the high pressure chamber 17, the safety valve 29 is moved upwards and the discharge channel 24 is closed. The gas pressures in the high and low pressure spaces can therefore never be lower than P ₁ + Ap ₁ or p ₂ '+ Ap ₂ ' .

If the safety valve 29 has come into operation, an auxiliary switch 46, which is a signaling device, is closed (not shown) actuated.

From the foregoing it can be seen that the pressure gas switch should be designed and work in such a way that the amount of extinguishing gas required to delete the switching arc does not lower the pressure in the high pressure chamber 17 to below the value P _x '+ Ap ₁ atm. degrades. In some cases, the closing of the safety valve can be used at the same time to limit the amount of extinguishing gas used during the switch-off process. Furthermore, the gas feed system must be set in such a way that the supply of gas to the low-pressure space only takes place when the pressure in this space is below a value p. ₂ '+ Ap _{2 has} decreased.

1 sheet of drawings

Claims (1)

* λ high pressure chamber is surrounded with at least two Vy to break the circuit from each other Claim: separable switch contact pieces, of which at least u ι A " itens one is a pipe contact piece whose hollow Metal-enclosed gas pressure switch, among other things * _{Switch-on of} the gas pressure switch exclusively for interrupting a current 5 lauiraim « _sha ; _{the contact} piece is closed circuit is used, with a metal vessel and a Jurch the other "£ ^ _n H _{61n überdr C} u k isolated switching element arranged therein that opens out and in ^ ^eiM _dd kraum, so that the through a vessel filled with gas under overpressure f £ ™ ^"e" ™ ° _{md of Never} derdruckraum in the High pressure chamber is surrounded, with at least ™ ^? ™ £ " _{H of the} pressure gas switch from each other two for interrupting the circuit from each io Einschatste "clothes _of ^B _AUSS chaltvorganges JE other separable switch contact pieces, from the ¹ ^ "" ¹ ! "% .- _pipe contact piece through At least one of them is a pipe _{contact piece through the R ° £ * ° «fa wekher Nieder} . is, whose cavity in the on position of the ^^ ZJaS ^ Ii with a through a Pressurized gas switch through the other switching pressure belt £ _{ü up to the} clock piece is closed and with gas. ₅ ^ "^ T ^ Vossen holds as long as the pressure of the shot under lower overpressure filled low drainage channel, see _the pressure chamber opens out so that the high pressure gas ™ Njd ^ ckn «^ ^^ _ room and the low-pressure room in the switch-on as em ^ jnem SS _{djesen Kana |} „ _ff position of the pressure gas switch from each other ^ch ™ *% ° "% ™ £ ^ _n limit value exceeded. are disconnected, during the switch-off process each ao Wennι dg ^ r £ ™ Autovermietung se this _{type is from the fran} . but through the pipe contact piece with Eη compressed gas cha er ^^ are in open communication with each other which »^ '« ™ switch is the risk of Low-pressure chamber has a drainage duct with a well- _{known drainage} duct by a spring loaded check valve that if the m ^ has, which has closed the drain channel, * ₅ f ^k f £ J is _{not capable of} im as long as the pressure of the gas in the N.ederdruck- ^ 3 ^ e Gasspe.seange room has a value which is lower than a limit value corresponding to a low pressure room eno low pressure given overpressure ^ Jd ^ d « ^D ™ 2 _m ^ _h S _e n pressure or up to