DE1298603C2 - SHIELD GAS CONTACT PLANT FOR THE SENDING OF CURRENT PULSES ACCORDING TO MEASURING VALUES FROM AN ORDERING POINT TO A RECEIVING POINT, IN PARTICULAR FOR TRANSFERRING THE CURRENT VALUE OF A MEASURING ORGANIZATION TO A COUNTER SYSTEM - Google Patents

Description

45

The invention relates to a protective gas contact mechanism with a contact device to be guided past, Multi-pole magnetic field generator for the emission of current surges according to the measured value from a sending point to a receiving point, in particular for the transmission of the circulation value of a Measuring organ on a counter.

It is known in measuring devices whose measuring element | S5 corresponds to a dispensed amount of a medi-j revolves around, with the rotation of the measuring element a permanent magnet on the fixed protective gas contact to lead past and by means of the contact caused by each current impulses on a To give counter.

In FIG. 1 are parts of such a protective gas contact plant shown in section. Of the rotating measuring element, not shown here, is on the Shaft 1 attached disc-shaped support body 2, which on its circumference with the cylindrical bar magnet 3 is equipped, driven opposite the fixed protective gas contact 4 ip arrow direction.

In another known Schutegasontaktwerk of this type, permanent magnets are in addition to the rod-shaped Auxiliary magnets on the disk-shaped support body with the rod-shaped permanent magnet opposite polarity applied. These HBfsmagneten, their magnetic force for actuation of the protective contact is not sufficient, ensure that the protective contact is only activated when the rod-shaped permanent magnet is directly in front of the inert gas contact.

Furthermore, a protective gas contact mechanism is known in which several are arranged around the support body Inert gas contacts are actuated once for each rotation of the support body. The support body is except for a small gap on its circumference of radially magnetized bar magnets of the same polarity surrounded inside and outside by not completely closed, annular pole pieces are. A fixed permanent magnet is assigned to each shielding gas contact, which forms the shielding gas contact looking to keep closed. If the supporting body comes into such a rotational movement Position with regard to the individual protective gas contacts that these do not have a magnetic field Gap on the circumference of the support body is opposite, then the fixed permanent magnet is fully effective, d. i.e. the protective gas contact is closed. If the supporting body rotates in the course of its rotational movement further, then the magnetic field generated by the pole pieces and the bar magnets becomes effective, which counteracts the magnetic field of the fixed permanent magnets and consequently opens the inert gas contacts leads.

If an increase in the number of impulses per unit of quantity is required to increase the measurement accuracy, so the current surge frequency must be increased. It would be obvious to increase the frequency of current surges by increasing the transmission ratio between the rotating measuring element and to achieve the magnet support body to be driven. The disadvantage here is the increase in required drive torque for the magnet support body of the protective contact mechanism. The through the transmission efficiency frictional torques due to increase more than proportionally with the transmission ratio, while the acceleration torques are even quadratic with the transmission ratio raise. The resulting additional load on the measuring element results in below Under certain circumstances an impermissible increase in the measurement error.

In order to avoid this, one has at the circumference of the in FIG. 1, several bar magnets are attached, so that several bar magnets are guided past the fixed protective gas contact 4 one after the other during the revolution of the measuring element corresponding to a unit of quantity. With such a design of the magnet body - as in the case of the known protective gas contact mechanisms described at the beginning -, as the lines of force shown in dashed lines indicate, a relatively high leakage flux; only a small fraction of the total power flow is available in the air gap δ of the protective gas contact as an effective power flow for actuating the contact tongues of the protective gas contact; thus the economic utilization of the magnet volume is only slight.

Another known one has the same disadvantages

Kontaktwerk on, with one on both sides as a supporting arm radial ^un ^ "^ iJuBri ^ iS

body-serving disc horseshoe magnets against magnets Jl ^u " ^u Tl _echend the circulating

opposite polarity are placed, which at the front of ^ TragKOrp * .r ^M _{pf ü} Jr _hhmg compared to the

walk up to a measuring element with a ferromagnetic body m ™ Bäumeneed f _Td ^B | _e plus the

by equipped contact spring of an interrupter 5 protective gas contact 34 gear _{k overlap E}

contact cause a current surge. Pole spacing τ and f ^r jf ™ ^ j? j Λ _It results in sicn

To improve the known protective gas con-good here d »gi» ww _{pole spacing T} , which is the case with a

taktwerke a protective gas contact mechanism is provided, including gui »β_ shaft rotation

which is characterized according to the invention, f ™ " ^sc ^ ^e ""J _r ° J _e ring magnets determined,

that a generator driven by the Meßorgun, umlaufen- 10 _can * _th the LJurcnmesser u _M also

d Tkö i tich conductive ring ^Al1 * ⁿ ? ^ß S it magnetisie

that a driven by the measuring organ, revolve 10 the _{Mten can} also from

the Tragköφer from a magnetically conductive ring ^Al1 * ⁿ ? ^ß Sacheren and lowest Magnetisieumgeben is, on its circumference at least one ^{Gmnden d} "™ ° E th _e to be established. This series radially magnetized to the rotational axis, in recirculated ™ ⁿ e ^of *}?" Ψ? _the further advantage of the magnet work direction of successive permanent magnets through the result: sicn magnetization direction of opposite polarity is applied in each case. 15 E> hese magnetic materials have a ^stone in the g i F. 2 is an embodiment of the inventions j ^ ^e T £ _Nohen content of magnetic Energ.e to the invention a protective gas contact with two work as ° "J £" _η ^ gestures a particularly small and radially and multipolar magnetized rings 21 and 22 go ?. B-uart of Schutzp? Skontaktwerk enables Rih Pmanentmagneten represent- "= '"

radially and multi-pole magnetized g go B

formed rows of permanent magnets represent- "= '"

gesteDt, which are attached to the circumferential support body23 «° ^UC ", "Advantages of the protective gas cone according to the invention that a radially exiting and entering. ™; . ° _arise next to a diminished

are attached that a radially _exiting and entering ™. ° erReb en next to a diminished

Power flow arises. From the dashed "" ^ ^Γ ^ ₀ ^ | _{ηί and} saving the transmission line of force, it is evident that the * J? _{h so that also} h the acceleration and Rei scatter compared to the known design according to r ¹ "."! ' _{duck Ke} ring can be held, a Fig. 1 has been reduced; the ring 24 provided on the support- «5 ^ ™ / ^^ of the magnetic flux through body 23 serves as a return path- ^ frf ?? _{of the} air path and thus a reduction in the magnetic flux. ^ ^E % “| _{There will still be a lot of care} as well as little effort in this case, if with relatively large ίΐ * _etmateria i as a result of the favorable use of the pole spacing τ and large contact ^reeds

cover E of the protective gas contact 25 is part of the ao «:. _{the magnetization} can

Force flow does not go through the air gap δ and there-. * 7.Γ. _{e Ma} g _ne t is ineffective from individual parts previously separated. _u .,., mametized sector-shaped permanent magnet

One does as it will be shown in the exemplary embodiment of FIG.

F i g. 3 is shown, the pole pitch τ substantially greater ^LCB _Wesent f _ichste VorteU is the low zuals the contact tongue overlap E, the load of 35 _ÄtzHchen Meßürgans is eliminated so that no disadvantage just mentioned. _ Significant increase in measurement error occurs.

In Fig. 4 is a protective gas ^{contact mechanism with ucuu}

1 sheet of drawings

Claims (5)

Patent claims: 1. Inert gas contact system with a multi-pole one to be led past a contact device Magnetic field generator for the emission of current impulses from a corresponding measured value Issuing point to a receiving point, in particular for the transmission of the circulation value of a measuring element on a counter, characterized in that a circumferential support body (23) is surrounded by a magnetically conductive ring (24), on the circumference of which at least one row Permanent magnets which are magnetized radially to the axis of rotation (1) and * 5 in the direction of rotation (21) each of opposite polarity is applied. 2. Inert gas contact system according to claim 1, characterized in that when using * ° inert gas contacts with low contact tongue coverage, the rows of permanent magnets (21, 22) are close together with opposite polarity. 3. Schutgaskontaktwerk according to claim 1, da- ^a 5 characterized in that when using protective gas contacts with large Kontaktzungenüberdeckuug the rows of permanent magnets with opposite polarity are separated from each other while maintaining an air gap. 4. Inert gas contact mechanism laughs one of claims 1 to 3, characterized in that the Rows of permanent magnets are designed as multi-pole, radially magnetized rings (31). 5. Inert gas contact mechanism according to one of claims 1 to 4, characterized in that the rows of permanent magnets (21, 22) are composed of individual, previously separately magnetized, rod-shaped permanent magnets radially to the axis of rotation. * °