CH649134A5 - Canned motor pump, especially heizungsumwaelzpumpe. - Google Patents

Description

649 134 2

PATENT CLAIMS the greatest performance and with the switch open the motor turns at a reduced speed. So that the engine even when first

1. canned motor pump, in particular heating circulation switching starts reliably, a pump is arranged parallel to the series resistor, with an electric motor having a first and a second winding (1, 2; 13, PTC thermistor. If the motor is to be open with switch 14 open), at least two Working start 5, the ballast resistance is switched by the cold-setting switching device (3; 15), which bridges the PTC thermistor and the motor can be designed and wired to the maximum that torque starts in the first working position. The current flowing through the PTC thermistor supplies the full mains voltage to the first winding (1; 13) and heats the PTC thermistor so that its resistance becomes strong and the second winding (2; 14) and a capacitor rise. As a result, the series resistor becomes effective and the (4; 16) comprehensive series circuit is reduced in parallel with the first winding 10 speed.

is switched, and a PTC thermistor (6) to enlarge the This well-known motor pump runs even in the open position.

Motor tightening torque when the switching device is in the switch position, but there is the disadvantage that there is a position for reduced motor power, characterized by the effect during operation at a reduced speed that the switching device (3; 15) is so effective Motor pump due to the heat losses in the pre-formed is that the mains voltage is reduced in its second working position.

voltage formed from the two windings (1,2; 13,14) It is an object of the invention to provide a canned motor pump

Series connection is supplied and the aforementioned capacitor to create the type mentioned above, which is connected to the above-mentioned (4, 16) parallel first winding (1; 13) that disadvantage does not adhere.

another from the PTC thermistor (6; 18) and a second. The canned motor pump according to the invention is characterized by the in

Capacitor (5; 17) formed series connection is present, 20 characterizing part of claim 1 and that the further series connection is characterized in parallel to the first-mentioned features.

Capacitor (4; 16) is switched when the Umschaltvor- The subject of the invention is explained below with reference to the direction in the working position for reduced engine power on the drawing, for example. Show it:

located. Fig. Idas circuit diagram of a first embodiment of the

2. canned motor pump according to claim 1, for two power canned motor pump according to the invention, with a two stages, characterized in that the switching device having working positions power switch;

a two-position switch (3) with Fig. 2 the basic circuit when the power switch

a movable contact track (9) and three stationary contact switches in the first working position;

ten (10, 11, 12) is that the contact path in the first working position is the basic circuit when the power switch is in the second working position with the first contact and in the second working position switch;

tion is connected to the second and third contacts, and FIG. 4 shows the circuit diagram of a second exemplary embodiment, that the one connection of the first winding (1) to the contact of the canned motor pump according to the invention, with a three path, the one connection of the second winding (2 ) power switches at the first working positions;

Contact (10), the other connection of the second winding to FIG. 5 the basic circuit when the power second contact and the one connection of the second series switch according to FIG. 4 is in the first working position; Circuit (5, 6) is connected to the third contact (12). Fig. 6 shows the circuit diagram according to FIG. 4, but in which

3. canned motor pump according to claim 1, for three power- the power switch in the second working position; stages, characterized in that the switching device Fig. 7, the basic circuit when the power to a three-position changeover switch (15) with switch in the working position shown in Fig. 6 has a movable contact path (10) and four fixed Contact- 40 finds;

ten (20,21,22,23) is that the contact path in the first FIG. 8 is the circuit diagram according to FIG. 4, however

Working position with the first contact (20), in the second of which the power switch is in the third working position;

Working position with the second and third contacts (21, 22) Fig. 9 the basic circuit when the power change

as well as in the third working position with the third and fourth switches in the position shown in FIG. 8, and contact (22, 23) is connected, and that the one connection of FIG. 45 is the graphical representation of the relationship between the first winding (13) to the contact track, one connection of the second winding (14) to the torque of the motor and the speed of the motor to the first contact (20), the other according to the second exemplary embodiment.

Connection of the second winding to the third contact (22), FIGS. 1 to 3 relate to a first exemplary embodiment of a connection of the further series circuit (17, 18) to the canned motor pump according to the invention, in which fourth contact (23) and the center point of the further series - only the electrical components are shown. The circuit is connected to the second contact (21). Motor has a first winding 1 and a second winding 2.

4. canned motor pump according to one of the preceding further are a power switch 3, a first capacitor 4, claims, characterized in that the PTC thermistor is a second capacitor 5, a PTC thermistor 6 and two connection PTC resistor. terminals 7 and 8 available. The power switch 3 includes

55 a movable conductor track 9 and three stationary contacts 10, 11

and 12. The power switch 3 can be a first, pulled out. The invention relates to a canned motor pump according to the illustrated working position, in which the contact track 9 touches the preamble of claim 1. first fixed contact 10, or a second dashed line

From German Offenlegungsschrift No. 2 819154 a position is shown in which the contact path 9 motor pump, in particular a speed-switchable heating element 60, contacts the two fixed contacts 11 and 12. One pump known. It has a shaded-pole motor with two Wiek connection of the first winding 1 and the two capacitors. One winding is in series with a ballast 4 and 5 are connected to one terminal 8. The current and the other winding in series with a condenser-other connection of the first winding 1 is electrically connected to the gate. Both series connections are connected to one another in parallel with conductor track 9. One connection of the second winding is switched and intended for connection to the mains voltage. 65 lung 2 and the first fixed contact 10 are connected to the other. The pre-connection terminal 7 can be connected by means of a simple two-pole switch. The other connections of the switching resistor for changing the speed of the motor short-second winding 2 and the capacitor 4 are electrically closed. When the switch is closed, the motor gives the second fixed contact connected. The other

Connection of the capacitor 5 is connected via the PTC thermistor 6 to the third fixed contact 12.

If the power switch 3 is in the working position shown in solid line in FIG. 1, the basic circuit shown in FIG. 2 is effective, i. H. the motor turns off at maximum speed and maximum power when the mains voltage is applied to terminals 7 and 8. If the power switch 3 is in the working position shown in dashed lines in FIG. 1, the basic circuit shown in FIG. 3 is effective. When the engine is switched off, the PTC thermistor 6 assumes the ambient temperature. If the mains voltage is now applied to the connection terminals 7 and 8, the resistance of the PTC thermistor 6 is initially negligible, which means that the sum of the capacitances of the capacitors 4 and 5 is effective in the basic circuit shown in FIG. 3. The PTC thermistor 6 is heated by the current flowing through it and, accordingly, its resistance value increases rapidly. As a result of the increase in the resistance value of the PTC thermistor 6, the effective capacitance connected in parallel with the winding 1 decreases, as a result of which the speed of the motor and its output are reduced by the desired amount. The motor runs accordingly, even if the power switch 3 in the second working position, i. H. in the working position with reduced power, is safely on.

The advantage of this arrangement over known designs is that in continuous operation with reduced power there are no additional losses in an ohmic ballast resistor.

4 to 9 show a second embodiment of the canned motor pump according to the invention in different working phases. Again, only the electrical components of the canned motor pump are shown in these figures. The motor has two windings 13 and 14. Furthermore, a power switch 15, two capacitors 16 and 17 and a PTC thermistor 18 are present. The power switch 15 contains a movable contact track 19 and four fixed contacts 20, 21, 22 and 23. The one connections of the first winding 13 and the two capacitors 16 and 17 are connected to a connection terminal 24. The other connection of the first winding 13 is electrically connected to the movable contact track 19. One connection of the second winding 14 and the first fixed contact 20 are connected to a second connection terminal 25. The other connections of the second winding 14 and the capacitor 16 are electrically connected to the third fixed contact. The other connection of the capacitor 17 is connected to the fourth stationary contact 23 via the PTC thermistor 18. The connection point between the capacitor 17 and the PTC thermistor 18 is electrically connected to the second fixed contact 21.

FIG. 5 shows the basic circuit which is effective when the power switch 15 is in the position shown in FIG. 4. In this case, the motor delivers its maximum power when the mains voltage is applied to the connection terminals 24 and 25. The capacitor 17 and the PTC thermistor 18 are completely ineffective in this position of the power switch.

FIG. 7 shows the basic circuit which is effective when the power switch 15 is in the position shown in FIG. 6. The two capacitors 16 and 17 are connected in parallel with the first winding 13, so that the motor can deliver an average power. The suit649 134

At this medium power, the torque of the motor is still large enough for it to start safely. When the power switch 15 is in the position shown in FIG. 6, the PTC thermistor 18 is still ineffective.

FIG. 9 shows the basic circuit which is effective when the power switch 15 is in the position shown in FIG. 8. In continuous operation, the motor delivers such a reduced power that the motor would no longer start safely without the additional measure. If the mains voltage is applied to the connection terminals 24 and 25 after the motor has come to a standstill, the PTC thermistor 18 has assumed the ambient temperature, similar to the basic circuit shown in FIG. 3, and its resistance value is accordingly small. The effective capacitance connected in parallel with the first winding 13 is equal to the sum of the capacitances of the two capacitors 16 and 17. Accordingly, the tightening torque of the motor is the same as if the power switch 15 were in the position shown in FIG. 6. The current flowing through the PTC thermistor 18 heats the PTC thermistor 18 so that its resistance value increases rapidly. Accordingly, the effective capacity connected in parallel with the first winding 13 decreases, whereby the power output of the motor is automatically reduced.

Of course, the capacitors 16 and 17 and the PTC thermistor 18 must be selected so that a minimal current flows through the PTC thermistor 18 during continuous operation, which current is sufficient to keep the PTC thermistor 18 at a temperature which is higher than the ambient temperature, at which temperature the effective capacitance connected in parallel with the first winding 13 has a value necessary for the minimum power output of the motor.

10 shows the relationship between the torque of the motor and the speed of the motor for the three possible positions of the power switch 15. The curve 26 shows the torque of the motor in function of the speed of the motor for the working position of the power switch 15 shown in FIG. H. for the maximum power of the engine. Curve 27 shows the torque of the engine when the power switch 15 is in the working position shown in FIG. 6, the engine delivering an average power. Curve 28, shown partly in dashed lines and in solid lines, shows the torque of the motor when power switch 15 is in the working position shown in FIG. 8 and PTC thermistor 18 would not be present. The dash-dotted curve 29 indicates the general profile of the torque in relation to the speed of the motor and shows the effect of the PTC thermistor 18. The profile of the curve 29 is essentially dependent on the load on the motor and the characteristics of the PTC thermistor 18. In any case, curve 29 runs in the area between the two curves 27 and 28. In continuous operation, curve 29 is in the upper third of the reduced speed in the vicinity of curve 28.

When the power switch 15 is in the working position for the lowest motor power, the tightening torque is increased by the action of the PTC thermistor 18 to the value of the pull-out torque which is represented by the curve 27. This ensures a corresponding improvement in the operational safety of the motor and the pump.

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3 sheets of drawings