JP2000060145A - Driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate exchange of smoothing capacitors by arranging the smoothing capacitors storing electric power converted into a DC by a converter part as a unit, and detachably installing the smoothing capacitor unit in a box body. SOLUTION: Smoothing capacitors 23 which stores electric power converted to DC by a converter part is made into a unit, and this smoothing capacitor unit 20 is detchably installed in a box body. The box body of a driving apparatus is so constituted that an upper casing and a lower casing are tightly fixed by using screws. The smoothing capacitor unit is exposed by removing screws in a screwing part and taking off the upper casing. When the capacitor unit 20 is exchanged for the maintenance or the like of a pump, the upper casing is removed, and screws 24 of the capacitor unit 20 are removed, thereby enabling easy removal of the capacitor unit 20 from a connection part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for driving a pump motor or the like, and more particularly to a driving device for supplying an AC power having an arbitrary frequency and voltage to the pump motor or the like so that the operating speed of the pump motor or the like can be adjusted. The present invention relates to a drive device capable of changing the speed.

[0002]

2. Description of the Related Art FIG. 4 shows a connection diagram of a conventional driving device for supplying AC power of an arbitrary frequency and voltage to a pump motor or the like. The diode module 11 constitutes a converter for converting AC power to DC power, and has a diode element connected in a bridge type. The output side of the diode module 11 is connected to the smoothing capacitor 12, smoothes the ripple of the output voltage of the converter unit 11, and stores DC power. The output side of the smoothing capacitor 12 is connected to an inverter / power module 13, and constitutes an inverter unit that reversely converts the power stored in the DC unit into AC power of an arbitrary frequency and voltage.

The power module 13 has a power transistor and the like connected to a bridge circuit, and performs pulse width modulation (PWM) control and the like on the power transistor and the like to convert DC power into AC power of an arbitrary frequency and voltage. And supply it to the pump motor 16. The control unit 14 is configured by a microcomputer or the like, and forms a pulse width modulation (PWM) signal for forming AC power of an arbitrary frequency and voltage in the inverter / power module 13 and outputs the signal. The power supply unit 15 supplies a required DC low-voltage power supply to the control unit 14. The power supply unit 15 converts the relatively high-voltage DC power stored in the smoothing capacitor 12 to a low voltage by a DC / DC converter. To supply.

The conventional driving device shown in FIG. 4 includes a diode module 11, an inverter / power module 13,
The smoothing capacitors 12 and the like are connected and fixed to a heat sink or a printed circuit board, respectively, and are housed in a box 19 as shown in FIG. The box 19 of the driving device is provided with a connector, a terminal block for a control circuit, a terminal block for a main circuit, and the like. The operation panel connector is used to connect a dedicated cable to the operation panel and display an operation state of the driving device. The control circuit terminal block is used for, for example, inputting a signal of a pump discharge pressure or the like to feedback-control the discharge pressure of the pump to a predetermined target pressure. The main circuit terminal block is a terminal block for input of a commercial AC power supply and an output for supplying AC power of an arbitrary frequency and voltage to the pump motor, or a ground block or the like.

The smoothing capacitor 12 is connected and fixed by soldering directly on a printed circuit board inside the box body in order to reduce the size of the box body 19 accommodating the entire driving device, or is formed as three-dimensionally as high as possible. Has been implemented. For this reason, when the smoothing capacitor fails and needs to be replaced, it is necessary to remove several kinds of covers and parts such as the outer case, the operation panel, and the upper cover.
Then, it was necessary to pull out the printed circuit board on which the smoothing capacitor was mounted, remove the capacitor from the printed circuit board, and mount a new capacitor.

[0006] For this reason, replacement of the capacitor requires a specialized technician. That is, since the replacement of the smoothing capacitor is premised on replacement by a specialized engineer, it is actually very difficult to replace the smoothing capacitor by a person who is involved in maintenance of a general pump motor or the like.

[0007]

Incidentally, the smoothing capacitor is a component having a long life and is one of the components that need to be periodically replaced for maintenance. When the drive unit is used for variable speed operation of the pump motor, the maintenance of the pump motor is generally performed by an unspecified number of people at the place where the pump motor is installed, and knowledge of maintenance of the drive unit itself is required. Those who have it are rare. For this reason, the work of replacing the smoothing capacitor for regular maintenance is not easy for those who are involved in the maintenance and management of the ordinary pump motor, and the work of replacing the smoothing capacitor on a daily basis is extremely rare. there were. As described above, the structure of a driving device such as a conventional pump motor does not take into account the replacement of a smoothing capacitor having an essentially long life.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a drive device such as a pump motor capable of easily replacing a smoothing capacitor which needs to be periodically replaced. I do.

[0009]

According to the first aspect of the present invention, there is provided a converter for converting AC power to DC power, a DC unit including a smoothing capacitor for storing the power converted to DC in the converter, In a drive device including an inverter unit for inverting the power stored in the DC unit to AC power of an arbitrary frequency and voltage in a box body, the smoothing capacitor is unitized, and a smoothing capacitor unit is provided in the box body. A driving device which is detachably mounted.

According to the present invention described above, the smoothing capacitor is unitized, and the capacitor unit is easily and detachably mounted in the box of the driving device. Therefore, the regular replacement of the capacitor unit becomes possible even if the engineer does not have special technical knowledge, and the maintenance work is extremely easy.

The invention according to claim 2 is characterized in that the driving device drives the pump motor at a variable speed by supplying the pump motor with the AC power of the arbitrary frequency and voltage. The driving device according to claim 1. As a result, even a general technician who does not have electrical knowledge involved in the maintenance and management of the pump can replace the smoothing capacitor of the driving device.

The invention according to claim 3 is the drive device according to claim 2, wherein the drive device is fixed to a casing of the pump motor. As a result, the driving device can be cooled with water, and the smoothing capacitor unit can be mounted while maintaining a small and compact structure as a whole.

According to a fourth aspect of the present invention, the box comprises an upper casing and a lower casing, and by removing the upper casing, the smoothing capacitor unit can be attached and detached by inserting and removing screws. 3. The driving device according to claim 2, wherein: As a result, if there is one driver, even a person who does not have special electrical knowledge can replace the smoothing capacitor unit.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a smoothing capacitor unit according to one embodiment of the present invention. A plurality of smoothing capacitors 23 are mounted on the substrate 21. The board 21 is electrically connected to the connection terminals 22 and is mechanically fixed.
The (+) and (-) poles of the connection terminal 22 are connected to the (+) and (-) poles of each capacitor element by electrical wiring provided on the substrate 21, respectively. Connection terminal 2
2 is provided with an opening 26 so that a connection pin (not shown) on the drive device side is inserted.
The connection terminal 22 is provided with a screw 24 for screwing, so that it can be easily electrically connected to a connection pin on the box side (not shown) using a driver and can be mechanically fixed.

FIG. 2 shows an example in which the smoothing capacitor unit shown in FIG. 1 is housed in a box of a driving device. The lower part of the lower casing 32 is a heat sink. Both the diode module 11 and the inverter / power module 13 are directly fixed to the heat radiating plate 32A, thereby improving heat radiation. The lower casing 32 includes a support member 3
4 and 35 are erected, and a flat plate 36 for supporting the capacitor unit 20 is arranged on the upper side.
The heat sink may be directly fixed to the pump casing. Thus, the drive device can be cooled by the handling liquid flowing inside the pump. Further, fins may be attached to the heat radiating plate for air cooling.

The box of the drive unit is composed of an upper casing 3
1 and the lower casing 32 are tightly fixed by screws 33. Smoothing capacitor unit 20
Removes the screw 33 of the screwed portion, and removes the upper casing 31
It is exposed by removing it. Therefore, the condenser unit 20 is required for maintenance of the pump.
At the time of replacement, the upper casing 31 is removed, and the screws 24 of the capacitor unit 20 are removed, so that the capacitor unit 20 can be easily taken out from the connection portion 37. In order to mount a new capacitor unit, a new capacitor unit 20 is prepared, and the new capacitor unit 20 is fitted to the pin of the connection portion 37 provided on the support plate 36 on the device side with the opening 26 of the connection terminal 22 inserted therein. 24 can be fixed by tightening with a screwdriver. The replacement operation is completed only by fixing the casing 31 with the screws 33 in the same manner. As described above, since the capacitor unit 20 can be exchanged only by inserting and removing the screw by using one screwdriver, even an unspecified number of persons who do not have special electrical knowledge, such as pump maintenance personnel, can use the capacitor unit. Replacement of 20 can be performed very easily.

FIG. 3 is a connection diagram when the smoothing capacitor unit 20 shown in FIG. 1 is used. As shown in the figure, a diode module 11 constituting a converter section is directly connected to an inverter / power module 13 and has a terminal 1 for mounting a smoothing capacitor unit 20.
8 is provided. Accordingly, by connecting the smoothing capacitor unit 20 to the terminal 18, the electric circuit has exactly the same configuration as the conventional driving device shown in FIG. Therefore, the provision of the terminal 18 which can be connected to the outside makes it extremely easy to replace the capacitor unit 20 by attaching and detaching it.

In the above embodiment, an example has been shown in which four capacitor elements are arranged in two rows, and one end of each is connected to the DC section of the drive device as a connection.
The gist of the present invention is not limited to the above-described embodiment, and various modifications can be made. The same applies to the form of the driving device housed in the box.

[0020]

According to the present invention as described above,
Anyone can easily replace the smoothing capacitor unit of the driving device such as the pump motor. This makes maintenance work of the pump and the like extremely easy.

[Brief description of the drawings]

FIG. 1 is a perspective view of a smoothing capacitor unit according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an internal configuration of a driving device such as a pump motor according to one embodiment of the present invention.

FIG. 3 is a connection diagram of a driving device according to an embodiment of the present invention.

FIG. 4 is a connection diagram of a conventional driving device.

FIG. 5 is a view showing an appearance of a box of a conventional driving device.

[Description of Signs] 11 Diode module (converter section) 12 Smoothing capacitor (DC section) 13 Inverter / power module (inverter section) 14 Control section 15 Power supply section 16 Pump motor 20 Smoothing capacitor unit 21 Substrate 22 Connection terminal 23 Smoothing capacitor 24 , 33 Screw 26 Opening 31 Upper casing 32 Lower casing 36 Capacitor unit support plate

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hiroshi Morizuki 4-1-1, Motofujisawa, Fujisawa-shi, Kanagawa F-term in Ebara Densan Co., Ltd. 5E082 AB09 BB01 BC40 CC10 MM28 5H006 BB05 CA07 CC02 CC08 HA06 HA07 HA83 5H007 BB06 CA01 CC01 CC03 HA03 HA07

Claims (4)

[Claims] 1. A converter for converting AC power into DC power, a DC unit comprising a smoothing capacitor for storing power converted to DC by the converter, and a power and a voltage stored in the DC unit at an arbitrary frequency and voltage. A drive device provided with an inverter unit for inverting the AC power into the box body, wherein the smoothing capacitor is unitized and detachably mounted in the box body as a smoothing capacitor unit. 2. The drive device according to claim 1, wherein the drive device drives the pump motor at a variable speed by supplying the pump motor with the AC power having the arbitrary frequency and voltage. Drive. 3. The driving device according to claim 2, wherein the driving device is fixed to a casing of the pump motor. 4. The box body comprises an upper casing and a lower casing, and by removing the upper casing, the smoothing capacitor unit can be attached and detached by inserting and removing screws. The drive device according to claim 2.