Actuator for solenoid valve

0001The invention relates to a solenoid actuator for two actuators, with a counter to the action of a restoring force axially moveable outer armature for actuating of a control element and a counter to the action a restoring force axially movable inner armature for actuation of the other actuating element, wherein the inner Armature in the outer armature displaced longitudinally protrudes, with a magnetic drive, in both armature protrude, and with a magnet armature at the outer fortified inner magnetic yoke body for the inner armature, and a corresponding solenoid valve.

0002Such a magnetic locking device is for example for a double safety valve through the DE 195 25 384 A1 known.

0003In the double safety valve known from DE 195 25 384 A1 are the two poppet axially superposed arranged in a housing and each act with its own Valve seat together. The valve plates are each provided with an armature coupled in movement, wherein the one in the other is guided axially displaceably. The two magnet armature be a common magnetic drive against the action open each one closing spring, which is switched off the magnetic drive the two closing springs the closing stroke the two valve disks each other completely independent carry out. When opening the two into each other lying armature simultaneously by the magnetic drive and dressed in the same direction.

0004It is therefore an object of the invention in a magnetic Adjusting device of the aforementioned type a To achieve opposing movement of its two armature and a solenoid valve with such an actuating device provide.

0005This object is achieved by the fact that the inner armature axially between the outer armature and inner magnetic yoke body is arranged and that at least when fully tightened by the outer magnet drive Armature of internal armature between the outer armature and inner magnetic yoke body a magnetic circuit closes in which the magnetic resistance between the outer and the inner armature initially smaller than the magnetic Resistance between the inner armature and inner is magnetic yoke body and resulting by the fact Magnetic force of the inner armature opposite to outer magnet armature is attracted.

0006In the magnetic drive the two armature are so into each other arranged such that the outer armature at the same time for the inner armature forms a magnetic yoke body. This causes the two armature depending on the structural Interpreting, simultaneously or sequentially, in the opposite moving direction. The two magnetic circuits for the inner and outer armature can be designed to that due to different cross sections magnetically conductive and different restoring forces the two Armature simultaneously or sequentially actuated. The invention enables a solenoid actuator with two counter-acting armatures, in particular for actuating two actuators with different functions.

0007In preferred embodiments of the invention are the two armature disposed coaxially to each other, since so the solenoid actuator particularly compact and can make space-saving and thus produce inexpensive.

0008If at nichtangezogenem external armature of the inner armature axially spaced from the inner magnetic path body is, this means that first the outer armature is tightened, and only then, if the inner magnetic path body entrained in the vicinity of the inner armature was, also moves the inner armature. This means, the two armature sequentially in the opposite Direction tightened.

0009Conversely, if at nichtangezogenem external armature of inner armature already in the inner magnetic yoke body protrudes axially, the magnetic circuit is through the inner armature closed, so that the inner and the outer armature tightened simultaneously in opposite directions will.

0010increased in a particularly preferred embodiment the magnetically active for the inner armature Cross section of the inner magnetic yoke body in the tightening direction. By this measure is achieved that acting on the inner armature tightening force with the increased tightening path of the outer armature.

0011Preferably, the internal magnetic yoke body is a magnetic closure sleeve formed in the opening of the inner dressed Armature protrudes. facing the inner armature End of the magnetic circuit sleeve can outside in Toward the inner armature be conically tapered, whereby the magnetic resistance between the inner armature and magnetic closure sleeve to the tightening distance of the outer is reduced armature.

0012If the magnetic drive two operating stages of two different having large magnetic fields, the two Armature be selectively actuated. In a particularly simple embodiment comprises the magnetic drive a magnetic coil with two electrically separate windings to differently sized magnetic fields result, if they acted independently of each other with tension will. Alternatively or additionally in another Embodiment, an electronic switching device for the provided supply voltage and / or current of the magnetic drive be, with which the magnetic force of the magnetic drive for an actuation of the outer armature and an additional never operate the internal armature can be.

0013In an advantageous embodiment, the inner magnet yoke body the outer armature by a separate fixed axial connecting element, which for example, as a the formed inner armature surrounding thin-walled tube is. The connecting element should be made of non-magnetic material be made to the magnetic field of the magnetic drive not influence.

0014Preferably, for the outer magnet armature a two- or multipart outer magnet end sleeve is provided, into which the outer magnet armature is attracted. The outer magnetic circuit sleeve can radially inside a coil of be arranged magnetic drive and of a magnetic Shell and magnetic base are made, the axial Are spaced from one another. Between upper and lower parts a nonmagnetic middle part can still provided be. With such a 2 or 3-stage constructed solenoid end sleeve can be particularly favorable magnetic generating power line distributions in magnetic drive.

0015Thus, the inner armature not on the outer armature liable and thus no undesired effects of the movement the two armature occurs, is in an advantageous Embodiment between the outer and inner armature respectively, a spacer made of nonmagnetic material provided.

0016In another embodiment, between the inner armature and inner magnetic yoke body and between the outer Armature and its Polanlage each a non-stick plate provided, preferably made nichtmagnetschem Material is made. This is a "sticking" the inner armature on the inner magnetic yoke body or the outer armature at its Polanlage after shutdown the magnetic drive by magnetic remanence in the Share prevented.

0017The invention also relates to a solenoid valve having a like described above formed magnetic actuator, whose first valve disc to the outer armature and a second valve disc to the inner armature are coupled in movement.

0018In the solenoid valve according to the invention allows two drives realized for two actuators with different functions. The solenoid valve may, for example as a two-stage valve for primarily low operating pressures or valve formed integrated electric proportional control be. The double solenoid valve also makes it possible in a Housing both a check valve and a leak gas valve to integrate with a common drive.

0019Preferably, the first valve disc on the inner magnetic path body provided, and the second valve plate by the inner magnetic yoke body through the inner armature attached. The latter compound may, for example through a the inner magnetic yoke body by cross rod formed be that the inner armature and the second valve plate rigidly together.

0020Further advantages of the invention will be apparent from the description and the drawing. Also, the above mentioned features and those further described below in the present invention either individually or collectively in arbitrary find combinations. The illustrated and Described embodiments are as exhaustive understand enumeration but rather have exemplary Character for describing the invention.

0021It shows:<dl tsize="16"><dt>Fig. 1</dt><dd>schematically shows a longitudinal section through the drive a solenoid valve with the magnetic according to the invention Adjusting device in the non-activated magnetic field;</dd><dt>FIG. 2</dt><dd>in an enlarged view the detail II in FIG. 1;</dd><dt>Fig. 3</dt><dd>in one of FIG. 2 corresponding view a modification the magnetic shown in Fig. 1 Adjusting device;</dd><dt>FIGS. 4a to 4c</dt><dd>schematically prevailing in the solenoid valve of FIG. 1 Magnetic flux in various stages of operation the magnetic actuator; and</dd><dt>FIGS. 5a and 5b</dt><dd>an application of the solenoid valve shown in Fig. 1 as a gas solenoid valve with integrated leak gas valve.</dd></dl>

0022In <b>Fig. 1</b> is with <b>1</b> the drive of a solenoid valve called, the two series-connected valves <b>2</b> and <b>3</b> a common valve opening <b>4</b> have and coaxially to one another are. The first valve 2 comprises a first valve plate<b>5</b>, A first closing spring <b>6</b> and as an actuator for the first valve disk 5 an outer armature <b>7</b>of ferromagnetic material. At the top of Ventilöffnungswandung <b>8th</b> is the valve seat for the first valve plate 5. The second valve 3 includes a second poppet <b>9</b>A second closing spring <b>10</b> and as Actuator for the second valve disk 9 an inner magnetic armature<b>11</b> of ferromagnetic material. The valve seat for the second valve disk 9 is located on the underside of the Ventilöffnungswandung. 8

0023To open the two valves 2, 3 is a common magnetic drive<b>12</b>, Which essentially consists of a magnet housing<b>13</b>, A yoke <b>14</b>, A magnet coil <b>15</b> and, arranged therein outer magnetic circuit sleeve <b>16</b> consists. This magnetic circuit sleeve 16 is a two-part cup-shaped from an approximately ferromagnetic shell <b>17</b> and a tubular ferromagnetic base <b>18</b> formed, the two Parts 17, 18 by means of a thin-walled tube <b>19</b> of non-ferromagnetic Material axially spaced apart are.

0024The hollowed-out or pot-shaped outer armature 7 is an internal magnetic yoke body <b>20</b> of ferromagnetic Material via a rigid connecting element <b>21</b> axial spaced and coupled in motion. In the embodiment shown the connecting element is a thin-walled 21 Tube, which in each case the outside of the two parts 7 and 20 is attached. At the inner magnetic yoke body 20 is the a first valve plate 5 provided. The outer magnet armature 7 and the inner magnet yoke body 20 are in the magnetic circuit sleeve 16 guided axially displaceably. The first Closing spring 6 between the first valve disk 5 and the Lower part 18 supported, while the second closing spring 10 between the second valve disc 9 and the valve housing <b>22</b> supported is.

0025The inner magnetic armature 11 protrudes into the outer armature 7 insertion, making it out axially. Over a the inner magnetic yoke body 20 through cross bar <b>23</b>. is the second valve disk 9 with the inner armature 11 rigidly connected with the rod 23, two guide sleeves<b>24</b> are provided. Alternatively, the guide surfaces the inner magnetic path body 20 also with a low friction Coating (eg, PTFE) can be provided.

0026Thus, the outer and inner armature 7, 11 noncontiguous liable and thus no undesired effects the movement of the armature occurs in between a spacer <b>25</b> of non-ferromagnetic material arranged. A sticking of the armature 7, 11 to Waste of the magnetic field of the magnet coil 15 is in each case by an anti-adhesion disc <b>26</b>. <b>27</b> between the outer armature 11 and shell 17 and between the inner armature 11 and inner Magnetic yoke body 20 is prevented.

0027In case of application of the double solenoid valve 1 in a Control unit for gases or liquids, the two Parts 17, 18 of the solenoid end sleeve 16 and the outer armature 7 and the magnetic yoke body 20 by means of the pipe 19 and the connecting member 21 sealed together be.

0028As the <b>FIG. 2</b> shows the inner magnet armature 11 is at nichtbestromter solenoid 15 from the inner magnetic yoke body 20 axially spaced. In addition, the internal magnetic yoke body 20 an annular control edge <b>28</b> provided which the outside toward the inner armature 11 conically tapered. This control edge 28 causes the between the inner armature 11 and inner magnet yoke body 20 effective magnetic resistance is reduced when the inner armature 11 in the opening <b>29</b> the inner magnetic yoke body 20 protrudes.

0029In the embodiment of <b>Fig. 3</b> protrudes the inner armature 11 at nichtbestromter solenoid 15 already something in the opening <b>29 '</b> the inner magnetic yoke body <b>20 '</b> inside, since the control edge <b>28 '</b> formed here is higher than in FIG. 2 is. In both embodiments, the inner armature 11 equidistant towards the inner magnetic yoke body 20 axially.

0030In <b>Fig. 4</b> is the operation of the in Figs. 1 and 2 shown solenoid valve 1 shown: By energizing the solenoid coil 15, a magnetic field is generated, the above control edge <b>30</b>, (Fig. 1) at the upper and lower parts 17, 18 of the solenoid end sleeve 16 to the outer armature is transmitted. 7 It forms on the yoke 14, the upper part 17, the outer magnetic armature 7 and the lower part 18, a closed first magnetic circuit <b>32</b> out. The magnetic circuit 32 is designed so that the lines of force when excited Coil 15 first via the upper part 17 in the outer armature 7 and via this into the lower part of the magnet sleeve 18 flow. The result between the outer armature 7 and the upper part 17 a force 33, the outer magnet armature 7 against the top 17 in the direction 34 until it rests to the anti-adhesion disc 26 against the action of the closing spring 6 draws. Since the outer armature 7 with the inner magnetic circuit sleeve 20 is connected, this is pulled along. Thus is the magnetic circuit 35 via the inner magnetic circuit sleeve 20 closed. This causes between the inner armature 11 and the inner magnet sleeve end 20 in the direction 37 a Force acts which the inner armature 11 against the closing spring 10 pending investment attracts the nonstick disk 27th Thus moves at first only the outer armature 7, and a time delay, when the internal magnetic yoke body 20 the second Magnetic circuit 35 closes, and the inner armature moves 11. The two valves 2, 3 are thus successively open.

0031By matching the cross-sections of the two armature 7, 11 and the closing springs 6, 10 may depend on the Position of the outer armature 7 different types the movement and the balance of power can be achieved. A decisive influence on the movement, the two Armature 7, 11 in particular, the design of the Control edges 28 of the inner magnetic path body 20 and the Control edges 30, 31 of the solenoid end sleeve sixteenth

0032The two magnetic circuits 32, 35 can also be designed so, that due to different magnetically conductive Cross-sections and different closing springs 6, 10, two magnet armature 7, 11 are activated simultaneously. So 3 move in the embodiment of Fig., The two Armature 7, 11, because the second magnetic circuit at nichtangezogenem outer armature 7 through the internal magnetic yoke body 20 'has already been closed, at the same time in opposite directions. The two valves 2, 3 opened simultaneously.

0033The two magnet armature 7, 11 may also be via the magnetic field are sequentially driven selectively, for example by the supply voltage the solenoid coil 15 is varied. That is because of the solenoid coil 15, no voltage (0 volts), the solenoid valve closed (Fig. 4a). At a voltage of eg 110 volts, the first valve 2 is already fully open, while the second valve 3 is further closed (Fig. 4b). Only at higher voltages (eg 150 volts) then reaches the magnetic field out to the inner armature attracting 11 and thus also the second valve 3 to open. At a voltage of 220 volt, for example, is then and the second valve 3 is fully opened (Fig. 4c). determined With a suitable design of the second magnetic circuit Parameters, such as the control edge 28 of the magnetic yoke body 20, can be the inner armature 11 and the second valve 3 on dear proportional to the coil voltage. The solenoid valve can control by using only two tension (Eg 110 volts and 220 volts) as a two-stage Valve, in particular for low operating pressures used, will.

0034Two different sized magnetic fields can also be by a magnetic coil 15 with two superimposed produce windings by first only one winding of actuating the external magnet armature 7 and then the other winding to actuate also the inner armature 7 is supplied with power.

0035<b>Fig. 5</b> shows an application of the double solenoid valve 1 as Gas solenoid valve with integrated gas valve leak <b>38</b>, The of a gas inlet space <b>39</b> through the valve opening 4 in a Gas outlet space <b>40</b> outflowing gas quantity is determined by the two Valves 2, 3 regulated. Thereby closing the second valve disk 9 in its fully opened position (FIG. 5b) a further valve opening <b>41</b>Which otherwise the gas outlet space 40 with a leakage dissipation <b>42</b> connects (Fig. 5a).