JPS61102189A - Voltage response type circuit automatic switching type motor driven pump - Google Patents

Abstract

PURPOSE:To obtain a voltage response type circuit automatic switching type motor driven pump having a high reliability by switching the circuit of a motor in response to a power source voltage by a relay. CONSTITUTION:An auxiliary circuit in which a phase advancing capacitor C and an auxiliary winding A are connected in series, and two sets of main windings M, N are provided. When a power source voltage is 110V, relay contacts 71, 72 are switched by a relay 30, the windings M, N are connected in parallel, and connected with a power source. When the power source voltage is 220V, the contacts 71, 72 are switched by the relay 30. Thus, the motor driven pump can be responded to the high and low power source voltages without necessity of exchanging work of the motors.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a voltage-responsive circuit automatic switching type electric pump, and relates to a voltage-responsive circuit automatic switching type electric pump, which is responsive to power supply voltage, and is applicable to different voltages that can be used with a plurality of voltages. This is a voltage-responsive circuit that automatically switches the motor circuit of the electric pump.

[Background of the invention]

As a conventional electric pump used for pumping well water, for example, the one shown in Japanese Utility Model Publication No. 51-9695 has been used.

The electric motor used in these conventional electric bonders has a predetermined 7! It is normal that it is specially designed (for example, 110V only) to match the L source voltage (for example, 110V), and a power supply that is different from the initial setting voltage (for example, 220V)
When used for this purpose, it is common to replace it with a 220V-dedicated electric motor.

[Purpose of the invention]

The present invention provides a highly reliable, pressure-responsive circuit automatic switching type electric pop-up pump that can handle two or more high and low electric voltages without the need to replace the motor of the electric pump. The purpose is to provide

[Summary of the invention]

The feature of the voltage-responsive circuit automatic switching molded dynamic bong according to the present invention is that the motor circuit of an electric pump includes an auxiliary circuit in which a phase advance capacitor and an auxiliary winding are connected in series, and two sets of main windings. , a switching element that connects a parallel circuit in which the auxiliary circuit and one main winding of the two sets of main windings are connected in parallel to the other main winding of the two sets of main windings in parallel or series; , an excitation circuit that controls opening and closing of these switching elements, and a capacitor connected in parallel with this excitation circuit or the main winding, and when the voltage applied to this excitation circuit is lower than a predetermined value, In the switching element, the first-row circuit and the other main winding are connected in parallel, and when the voltage applied to the excitation circuit is higher than the predetermined value, the switching element connects the parallel circuit and the other main winding. A voltage-responsive circuit automatically switching molded dynamic bong is configured so that the windings are switched and connected in series.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a voltage-responsive circuit automatic switching electric pump according to the present invention will be described with reference to the drawings.

Here, FIG. 1 is a schematic partial cross-sectional view of an automatic electric pump according to one embodiment (prepared side), and FIGS.
The figure is a circuit diagram showing the basic principle of its configuration, Figures 5 and 6 are circuit diagrams of an electric pump according to one embodiment, and Figure 7 is a circuit diagram showing the basic principle of its configuration.
The unfolded cross section of the relay (Figure 8.9 is
Check out the equivalent circuit diagram of that relay.

First, in Fig. 1, 1 is a pressure tank, 2 is an electric motor,
3 is a pump part, 4 is a protective cover, 5 is a pressure switch, 6 is a water source, 7 is a suction pipe, 8 is a discharge pipe, 9 is a faucet, 1
0 indicates air.

That is, a pump section 3 driven by an electric motor 2 is placed on the pressure tank 1, and is covered with a protective cover 4.

A pressure switch 5 is attached to the pressure tank 1.

With this configuration, water flowing into the pump unit 3 from the water source 6 via the suction pipe 7 is pumped into the pressure tank 1 according to the opening and closing of the water faucet 9, which is supplied from the discharge pipe 8 to the faucet 9. enters and exits, and the pressure changes due to changes in the volume of the internal air 10.
The pressure switch 5 responds to open and close the drive circuit of the electric motor 2 to control the automatic operation of the pump section 3.

Next, FIG. 2 is a principle diagram of a 2° motor drive circuit for explaining the above embodiment.

In the figure, 2.5 is the already mentioned electric motor and pressure switch, 15 is the auxiliary winding (A), 16 is the phase advance capacitor (C), and 17
indicates an auxiliary circuit, 18 is one main winding (M) of the main windings of the motor 2, 19 is the other similar main winding (N), 2
0 to 22 are circuits, 23 are temperature-sensitive relays, 24 to 2
6 is a circuit, and 27 is a power supply.

Therefore, 0) in FIG. 2 means that the voltage of the power supply 27 is 11
In the case of 0V, (b) shows the connection when the voltage of the power supply 27 is 220V, and in this case, it shows the connection by manual switching.

That is, an auxiliary circuit 17 in which an auxiliary winding 15 and a phase advance capacitor 16 are connected in series, and a main winding (M) 18 are connected in parallel, with a circuit 24 connected to one end and a circuit 25 connected to the other end. . Also, one circuit 2 of the other main winding (N) 19
0 branches into a circuit 21 and a circuit 22 having a temperature-sensitive relay 23 for preventing winding burnout, and a circuit 26 at the other end.
is connected.

If the voltage of the power supply 27 is, for example, 110V, the circuit 21 and the circuit 24 are connected as shown in (a), the circuit 22 is connected to one end of the power supply 27, and the circuit 25 and the circuit 26 are connected to each other. At the same time, it is connected to the other end of the power source 27 via the pressure switch 5.

In the equivalent circuit in this case, as shown in FIG. 3, the auxiliary circuit 17, the main winding (M) 18, and the main winding (N) 19 are connected in parallel.

In addition, when the power supply voltage is high, for example 220V, the circuit 24 and the circuit 26 are connected as shown in (b),
One end of the circuit 22 and a power source 27 are connected, and the circuit 25 is connected to the other end of the power source z7 via the pressure switch 5.

The equivalent circuit in this case is as shown in Fig. 4, which includes a parallel connection circuit of the auxiliary circuit 17 and the main winding (M) 18, and the main winding (M) 18.
N) 19 are connected in series, and a voltage of 220V is applied in half (IIOV) to each half.

Therefore, the auxiliary circuit 17. If the main winding (M') 18° and the main winding (N) 19 are designed for 110V, and the circuit connection is switched as described above according to the power supply voltage, the 110V
This results in an electric pump that can be used with both 220v and 220v power sources.

Next, the circuit shown in FIG. 5 and FIG. , the circuit of the motor 2 is switched according to the power supply voltage.

Next, the configuration and operation of this relay 30 will be explained with reference to FIG.

That is, an electromagnet 34 is installed in a case 33 formed of a synthetic resin base 31 and a cover 32, and both ends of an excitation circuit 47 of the V-30, which will be described later, are connected to terminals 3 of the winding.
5.36 respectively.

Further, a suction plate 38 made of magnetic metal is supported in a seesaw shape on the support body 37, and one end is pulled by a tension spring 39.

On the other hand, the other end of the suction plate 38 faces the pole 40 of the electromagnet 34, and a conductive lever 42 is attached to the upper surface via an insulator 41. It is connected to a terminal 44 via 43.

Furthermore, the other end of the lever 42 is located between the terminals 45 and 46.

When the voltage applied to the excitation circuit 47 between the terminals 35 and 36 of the winding described above is lower than the operating voltage of the relay 3o (for example, xaoV) (for example, 10V), the attractive force of the electromagnet 34 is , is smaller than the moment force exerted by the tension spring 39, so the relay 30 maintains the state shown in FIG. The 8th one shows the simplified equivalent circuit of this and □.
In the figure, the terminal 44 and the terminal 45 maintain electrical continuity via the lever 42.

If the voltage applied to the excitation circuit 47 between the terminals 35 and 36 is higher (e.g. 220V) than the operating voltage (the above-mentioned <130V), the moment force due to the attractive force of the electromagnet 34 will cause the tension spring 39 to The suction plate 38 is attracted to the pole 40 by overcoming the moment force of .

In the above-mentioned FIGS. 7 to 9, the lever 42 has nine unipolar positions, but the one shown is a bipolar one as shown in FIG. 5.6, Terminal 44, 4
5.46 and the lever 42 as one set of opening/closing elements, and by providing a plurality of them, a multi-pole relay can be constructed.

Moreover, if a plurality of sets are provided, for example, the tension of each tension spring is set to be different, each of the opening/closing elements constituted by the terminals 44, 45, 46 and the lever 42, and the tension spring 39 can be set as one set. It is also possible to construct a multi-pole relay equipped with switching elements that open and close using voltage.

Although the description has been made in detail, we will now return to FIGS. 5 and 6 to further explain the present embodiment.

In this embodiment, a voltage-responsive circuit automatic switching type electric pump is constructed using one bipolar phosphor 30.

In the motor circuit described in FIG. 2, in this embodiment, one end of the main winding (N) 19 is connected to the terminal 51 of the V-30 via the circuit 26, and the other end is It is branched into two circuits: a circuit 21 connected to the terminal 54 of one of the switching elements 72 and a circuit 22 connected to one end of the power supply 27 via the temperature-sensitive relay 23.

Further, the circuit 24 connected to one end of the parallel circuit 17 is connected to the terminal 5
2, the circuit 25 connected to the other end of the parallel circuit 17 branches into two, one connected to the terminal 53 of the other switching element 71, and the other connected to the other end of the power supply 27 via the pressure switch 5. .

Further, an excitation circuit 47+'i is connected in parallel between the power supply 27 and the circuit of the electric motor 2.

A terminal 56 facing the terminal 54 and a terminal 55 facing the terminal 53 are connected to each other by a circuit 58. That is, the circuit 58 connects the terminal 5 of the switching element 72.
6 and the terminal 55 of the switching element 71.

As shown in FIG.
V), the state of the equivalent circuit for 110V shown in FIG. 3 is maintained. At this time, the circuit 58 is electrically cut off from the power source 27, and the potential is O and no current flows.

However, if the circuit 58 is connected to a power source (for example, 220 V) higher than the operating voltage of the Lin-30 (130 V in the above example), the excitation circuit 47 will not operate as shown in FIG. A voltage higher than the voltage is applied, the switching elements 71 and 72 operate, and the terminal 52 is switched to be connected to one terminal 56 of the circuit 58, and the terminal 51 is switched to be connected to the other terminal 55.

When both of these switches are performed, current also flows in the circuit 58 for the first time, and the circuit is maintained in the state shown in FIG. 4 above.

In this way, depending on the voltage applied to the excitation circuit 47,
The circuit of the motor 2 is appropriately and automatically switched, and one motor can be used for two types of power supply voltages.

Here, in particular, the reason why the circuit 58 is cut off at 110V is because an excessive arc current is generated at the terminal 54 when connected to 220V.
This is to prevent the contact from flowing between the terminals 56 and 56 or between the terminals 53 and 55, causing problems such as burnout and welding of the contacts. However, when the power supply voltage is not applied (the electric pop-up cord plug is not inserted into the power supply), the wiring state of the relay 30 is as shown in Figure 5, but the moment it is connected to the 220V power supply, The excitation coil 47
A current flows through the relay 30, and the connection of the relay 30 is switched in 0.1 to 0.2 seconds as shown in FIG.

However, during this 0.1 to 0.2 seconds, 11
A 220v voltage is applied in the 0v connection state.

In the course of research on the present invention, in addition to the particular circuit shown in FIG.
It has been found that the above-mentioned automatic switching circuit can be established even if 2 and terminal 55 are connected. However, as a result of various experiments and studies, in this case, when 220V is applied, the terminal 52 (
Since 220 V is directly applied between the terminal 53 (which has the same potential as the terminal 55) and the terminal 53, it has been found that an excessive arc current i (usually 5 to 10 times the maximum load current in experiments) may be generated.

In other words, instantaneously, both ends of the power supply 27 change from the power supply 27 to the circuit 2.
2 → Circuit 21 → Terminal 54 → Terminal 52 → Terminal 55 → Arc between terminals → Terminal 53 → Pressure switch 5 → Power supply 27 There is a possibility that a short circuit will be formed directly and an excessive short circuit current will flow. Understood.

Therefore, in this embodiment, when 110V is connected, the circuit 58 is cut off so that no potential is applied, and unless the switching actions of the terminals 52 and 51 are completely completed (they are performed at the same time), the circuit 58 will have no current. In addition, a capacitor 80 is installed between the circuit 22 and the circuit 25 in parallel with the excitation circuit 47, the main winding 19, or the parallel circuit 17 in FIG. .

This means that when the power cord is plugged into the power supply 27, or when the voltage suddenly recovers from a low power supply voltage such as during a power outage, the motor circuit will be in the state shown in Figure 5 (I
Because a high voltage (e.g. 22CN') is suddenly applied in the IOV connection), a large current may flow instantaneously (0.1 to 0.2 seconds), but this peak current can be controlled by the capacitance mentioned above. This prevents problems such as contact arcing or contact welding caused by the energization of the current. Accordingly, the terminal 54 and the terminal 5 as described above
6 or between the terminals 53 and 55, and problems such as contact welding were prevented.

It has been experimentally confirmed that, in the case of a motor with an output of about 100 W, if the capacitance 80 is 1 μF or more, the capacitance 80 has a significant effect on peak current absorption.

In particular, the capacitor 80 is arranged so that one end thereof is connected between the pressure switch 5 and the main winding 19 or the parallel circuit 17. This is done in consideration of the fact that the pressure gas notch 5 repeats the ON-FF operation in response to pressure fluctuations within the pump, and that it also absorbs the generation of peak current that occurs instantaneously during this switching operation. Furthermore, when the pressure switch 5 is turned off, the capacitance 80 is
7, the charged charge is discharged, but at this time, the capacitance 80 is cut off from the excitation circuit 47, so
It is discharged towards the main windings 18,19 of the motor. this is,
In general, the excitation coil constituting the excitation circuit 47 of the relay 30 is considerably thinner than the main winding 18, 19, so that problems such as discharge and disconnection of the excitation coil due to current are prevented from occurring. This can protect the excitation circuit 47 from the discharge current that inevitably increases, although it is necessary to increase the capacitance 80 above, especially when the peak current that occurs when plugging in the power supply or starting is large. Therefore, this method is particularly effective for high-output electric motors. Note that if the electric motor has a small output and the discharge current from the capacitor 80 can be ignored, the capacitor 8 is connected in parallel with the excitation circuit 47.
0 may be placed.
+1 However, in the above embodiment, one type of power supply voltage is applied to each of high and low power supply voltages, but this is applicable to multiple high voltages or low voltages, that is, two or more high and low power supply voltages. It is also possible to operate the electric pump automatically in response to the power supply voltage.

〔Effect of the invention〕

In view of the above, according to the present invention, even if the power source is different, the circuit of the motor is automatically switched appropriately according to the voltage, and the generation of excessive arc current between the contacts is prevented, resulting in problems such as contact welding. It is possible to obtain a highly reliable electric pump with a voltage-responsive motor circuit automatic switching type that prevents this from occurring, and can be expected to achieve significant effects in this embodiment.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional schematic front view of an automatic electric pump according to an embodiment of the present invention, and FIGS. 2 to 4 are
The circuit diagrams, Figures 5 and 6, showing the basic principle of its configuration are as follows:
A circuit diagram of an electric pump according to one embodiment, FIG. 7 is an open sectional view of the relay, and FIGS. 8 and 9 are equivalent circuit diagrams of the relay. 2... Electric motor, 5... Pressure capacitor, 15... Auxiliary winding (A), 16... Capacitor for phase advancement, 17.
...Auxiliary circuit, 18...Main winding (M), 19...Main winding 1it61 (N), 20~22.24~26.58.
...Circuit, 27...Power supply, 30...Relay, 47.
...Excitation circuit, 71.72...Switching element, 8o...
capacitance. Figure 2 (a)
(Kuchosotaku 3rd review No. 5 UZJ Sen6 Sae No. 7m No. 8 Zo No. qm

Claims (1)

[Claims] 1. In a motor circuit for an electric pump comprising an auxiliary circuit in which a phase advance capacitor and an auxiliary winding are connected in series, and two sets of main windings, the auxiliary circuit and the two sets of main windings are A switching element that connects a parallel circuit in which one of the main windings is connected in parallel with the other main winding of the two sets of main windings in parallel or series, and switching control of these switching elements. It consists of an excitation circuit that performs The other main winding is connected in parallel, and when the voltage applied to the excitation circuit is higher than the predetermined value, the parallel circuit and the other main winding are switched and connected in series. A voltage-responsive circuit automatic switching electric pump characterized by being configured as follows. 2. In claim 1, a pressure switch for controlling the operation of the motor is installed in series on a circuit connecting the power source and the main winding of the motor, and the pressure switch and the main winding are connected in series. A voltage-responsive circuit automatic switching type electric pump, characterized in that one end of the capacitance is connected between them.