JPH08177737A - Control panel for pump operation - Google Patents

Abstract

PURPOSE: To provide a control panel for pump operation by which a temperature rise in a control panel housing can be restrained by radiating heat of an inverter unit without using a ventilating fan. CONSTITUTION: In a control panel for pump operation where an inverter unit 32 is constituted by installing a part of an inverter circuit on a unit board, and this inverter unit is housed in a control panel housing 20, and a pump driving motor is controlled by the inverter circuit, a part of an outer wall of the control panel housing is formed of a heat radiating plate 30, and the inverter unit is installed in contact on this heat radiating plate. Therefore, since heat emitted from the inverter unit is radiated to outside air through the heat radiating plate, the heat is not filled in the control panel housing, so that a temperature rise in this housing can be restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control panel used for controlling the operation of a pump drive motor by an inverter circuit.

[0002]

2. Description of the Related Art When a pump is automatically operated, a method of controlling the rotation speed of an induction motor for driving the pump by an inverter circuit is adopted. In this type of inverter circuit, a power element including a switching element such as a bipolar transistor, FET, or IGBT is used in addition to a capacitor and a transformer, and this power element has a property of generating heat during operation. For this reason, if an inverter unit having the above power element incorporated in an inverter circuit is hermetically housed in the control panel housing, the temperature inside the control panel housing rises due to the heat generated from the inverter unit, and the inverter unit itself It also has a thermal adverse effect on other housing components, causing malfunction and shortening of life.

For this reason, in the conventional commercially available inverter unit, as shown in FIGS. 9 to 11, the inverter units a and a themselves have the heat radiation fans b and b and the heat radiation fins c and c. In this case, the heat radiated from the power element (not shown) is radiated to the outside of the inverter units a and a by the heat radiation fans b and b and the heat radiation fins c and c.

However, when such a commercially available inverter unit a, a is housed in the control panel housing d shown in FIGS. 9 to 11, it is discharged through the heat radiation fans b, b and the heat radiation fins c, c. The generated heat stays in the control panel housing d, and the temperature rises. To prevent this,
In the conventional control panel housing, a ventilation hole e is provided on the side wall, and a ventilation fan f is installed in this ventilation hole e.
As a result, the heat inside the housing d is released to the outside.

According to such a conventional structure, there is an advantage that a commercially available inverter unit a can be used and the temperature rise in the housing d can be suppressed. 9 to 11, the same members as those in the embodiment described later are designated by the same reference numerals and the description thereof will be omitted.

[0006]

However, in the conventional case, the inverter unit a itself has the radiation fins b, and the ventilation fan f is installed in the control panel housing d to radiate the heat in the housing d to the outside. Since it has a structure, the number of parts increases and the structure for heat dissipation becomes complicated.

Since the heat dissipation fan b is incorporated in the inverter unit a itself, the size of the inverter unit a is increased, especially the size thereof is increased, and the size of the control panel housing d is also increased, so that the whole size is increased. Further, since the heat radiation fan b and the ventilation fan f are operated during pump operation, the power consumption required for operating these fans cannot be neglected. Further, the life of the ventilation fan f is about 1 to 30,000 hours, which is shorter than that of the parts constituting the inverter circuit. When the ventilation fan f reaches the end of its life, the entire pump operation device becomes defective.

Further, since the outside air is exchanged and introduced into the control panel housing d, dust and moisture also invade, which may impair the functions of the inverter unit a and other accommodating parts and shorten the life. .

The present invention has been made in view of the above circumstances, and an object thereof is to release the heat generated by the inverter unit to the outside of the control panel housing without using a special fan, and It is intended to provide a pump operation control panel capable of suppressing the temperature rise of the pump.

[0010]

According to a first aspect of the present invention, an inverter unit is constructed by mounting parts constituting an inverter circuit on a unit substrate, the inverter unit is housed in a control panel housing, and a pump is provided by the inverter circuit. In a pump operation control panel for controlling a driving motor, a part of an outer wall of the control panel housing is formed by a heat radiating plate, and the inverter unit is attached in contact with an inner surface of the heat radiating plate. It is a control panel for pump operation.

According to a second aspect of the present invention, the outer wall of the housing on which the heat dissipation plate is provided is a bottom plate of the housing, an opening is formed in the bottom plate, and the opening is closed by the heat dissipation plate. The control panel for pump operation according to item 1.

[0012]

According to the invention of claim 1, the heat generating portion of the inverter unit is attached in direct contact with the heat radiating plate, and the outer surface of the heat radiating plate is brought into contact with the outside air. The heat is released to the outside air through the heat sink. Therefore, heat is not accumulated in the housing, and the temperature rise in the housing is suppressed.

According to the second aspect of the present invention, since the opening is formed in the bottom plate of the housing and the heat radiating plate is attached to the opening, the same layout as the conventional one can be realized and a wide area of the bottom plate is utilized. Therefore, the heat radiation area can be increased.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in FIGS. 7 and 8 show an apparatus for alternately or in parallel operating a plurality of pumps using an inverter, in which 1 is a bed, 2 and 2 are pumps, 3 and 3.
Are induction motors that drive pumps 2 and 2, respectively.
Is a suction flange of each pump, 5, 5 is a discharge pipe of each pump, 6 is a discharge flange, 7 is a pressure sensor, 8 is a flow sensor, 9 is a check valve, 10 is a control panel, 11 is a control panel support leg, Reference numeral 12 represents an accumulator.

In such a pump device, the discharge pressure and the discharge flow amount are detected by the pressure sensor 7 and the flow rate sensor 8, and the control device housed in the control panel 10 has two pumps 2, 2 in accordance with the detection signals. It is designed to control the independent operation, the parallel operation, or the alternate operation in the case of the independent operation.

The structure of the control panel 10 is shown in FIGS. 1 to 6, which will be described below. In the figure, 20 is a control panel housing, and this housing 20
The bottom plate 21, side plates 22 on four sides rising from the bottom plate 21, and the double doors 23 and 24 that open and close the front surface of the housing 20 form a closed space. An instrument 25 and a display panel 2 are provided on the open / close doors 23 and 24.
6 is attached.

A large opening 27 is formed on the bottom plate 21 at a portion where the inverter unit is to be attached. Noise filters 28, 28 are provided with screws 29, ... As shown in FIG. Is installed through.

A radiator plate 30 is attached to the opening 27. The heat radiating plate 30 is made of a metal having excellent thermal conductivity such as copper and aluminum, has an inner surface formed into a flat surface, and has a large number of heat radiating fins 31 formed on the outer surface.
Are formed integrally with each other.

Inverter units 32, 32, an electronic control wiring board 33 and earth leakage breakers 34, 34 are attached to the inner surface of the heat sink 30. The inverter units 32, 32 are, as shown in FIGS.
A unit board 321 with excellent thermal conductivity such as a copper plate
In addition, a power element 322 and a smoothing capacitor 323, which form an inverter circuit, an inverter control wiring board 324 on which other circuit parts are arranged, and a digital display panel 325 are integrally attached. The power element 322 is composed of a switching element such as a bipolar transistor, FET, or IGBT.

Such inverter units 32, 32
Has screws 35 at the four corners of the unit boards 321 and 321.
It is attached to the heat sink 30 by. In this case, the power element 322 that causes the largest heat generation is the heat sink 30.
The heat of the power element 322 comes into direct contact with the inner surface of the heat dissipation plate 3
It is installed so that it can be effectively transmitted to 0.

The electronic control wiring board 33 and the earth leakage breakers 34, 34 are also attached to the inner surface of the heat sink 30 via screws 36 ,. For this reason,
Two inverter units 3 are provided on the inner surface of the heat sink 30.
2, 32, one electronic control wiring board 33, and two earth leakage breakers 34, 34 are attached. That is, the heat dissipation plate 30 has an area enough to mount the two inverter units 32, 32, the one electronic control wiring board 33, and the two earth leakage breakers 34, 34.

The heat dissipation plate 30 is superposed on the bottom plate 21 of the housing 20 from the outside so as to hide the opening 27, and is fixed by the screws 38 penetrating the bottom plate 21 from the inside of the housing 20. There is. Therefore, the inverter unit 3 attached to the inner surface of the heat sink 30
2, 32, electronic control wiring board 33 and earth leakage breaker 3
4, 34 are housed inside the housing 20, and the radiation fins 31 ... Are exposed on the outer surface.

According to this structure, when heat is generated in the power element 322, which causes the greatest heat during use, this heat is transferred from the unit board 321 having excellent thermal conductivity to the heat dissipation plate 30. The heat is dissipated to the outside of the board from the outer surface of the heat dissipation plate 30, especially from a large number of heat dissipation fins 31. Therefore, the heat radiated into the control panel housing 20 is reduced, and the temperature rise in the control panel housing 20 is suppressed.

In this case, the heat sink 30 includes two inverter units 32, 32 and one electronic control wiring board 33.
Also, since it has a large area for arranging the two earth leakage breakers 34, 34 in a plane, the heat dissipation plate 30 itself has a large heat capacity and a large heat dissipation area. Such a heat dissipation area is obtained when the two inverter units 32, 32 are simultaneously operated and the two pumps 2, 2 are simultaneously operated in parallel.
It is large enough to allow the heat generated from the panel to be released to the outside of the board.

Despite having such a heat dissipation area,
Since the pumps 2 and 2 are rarely operated in parallel at the same time, and in most cases, they are alternately operated independently, it is almost the case that one of the inverter units 32 operates.
If the heat dissipation plate 30 has the ability to dissipate the heat generated by the two inverter units 32, 32, the temperature inside the control panel housing 20 hardly rises.

Therefore, as in the conventional case, the housing 20
There is no need to provide a special ventilation hole e or a ventilation fan f, and the number of parts is reduced and the structure is simplified. Further, the inverter unit 31 itself does not require the heat radiation fan b or the heat radiation fin c, and although it is a special specification that is not commercially available, the height dimension can be reduced, and the dimension of the control panel housing 20 can be reduced as compared with the conventional one. Can be lowered, and the whole can be miniaturized. Further, unlike the conventional case, since it is not necessary to operate the heat radiation fan b and the ventilation fan f, these operating noises are not generated, power consumption can be reduced, and energy can be saved. Further, since the ventilation fan f is not used, there is no restriction on the life characteristic due to this, and the life of the entire pump device is extended.
Further, since dust and humidity do not enter the control panel housing 20, it is possible to prevent problems such as hindering the functions of the inverter unit 31 and the other housing parts 28, 33, 34 and shortening the life. it can.

In the above embodiment, two pumps 2, 2 are used.
I explained the case of the pump unit with
The present invention is not limited to the use of a plurality of pumps, and can be implemented even when controlling the operation of one pump.

Further, the heat dissipation plate 30 is not limited to being attached to the bottom plate 21 of the housing 20, but may be attached to the side plates 22 ... Further, it is not necessary to attach the heat dissipation plate 30 so as to close the specially formed opening 27. Not limited to, bottom plate 21 or side plate 22
… Each of them may be composed of a heat radiating plate.

[0029]

As described above, according to the first aspect of the invention, the heat generating portion of the inverter unit is attached to the heat radiating plate, and the outer surface of the heat radiating plate is exposed to the outside air. Is released to the outside air through the heat sink. Therefore, heat is not accumulated in the control panel housing, and the temperature rise in the housing can be suppressed. Therefore, unlike the conventional case, it is not necessary to install a special ventilation hole or ventilation fan in the housing, the number of parts is reduced, and the structure is simplified. Further, the inverter unit itself does not require a heat radiation fan or a heat radiation fin, and therefore the inverter unit can be downsized, and the control panel housing can be downsized as compared with the conventional one.
Further, unlike the conventional case, since it is not necessary to operate the heat radiation fan and the ventilation fan, these operating noises are not generated, power consumption can be reduced, and energy can be saved. In addition, since no ventilation fan is used, dust and moisture will not enter the control panel housing, preventing problems such as hindering the function of the inverter unit and other housing parts and shortening the service life. it can.

According to the second aspect of the present invention, since the opening is formed in the bottom plate of the housing and the heat radiating plate is attached to this opening, the same layout as the conventional one can be realized and the large area of the bottom plate is utilized. Therefore, the heat radiation area can be increased.

[Brief description of drawings]

FIG. 1 is a front view of a control panel housing showing an embodiment of the present invention.

FIG. 2 is a front view of the inside of the control panel housing with the opening / closing door removed in the embodiment.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a view taken along the line IV-IV of FIG.

FIG. 5 is a front view of an inverter unit.

FIG. 6 is a side view of the inverter unit.

FIG. 7 is a plan view of a pump unit using two pumps.

FIG. 8 is a front view of the pump unit.

FIG. 9 is a front view of the inside of the control panel housing in a state where the opening / closing door is removed in the conventional case.

10 is a cross-sectional view taken along the line XX of FIG.

FIG. 11 is a view taken along the line XI-XI in FIG.

[Explanation of symbols]

1 ... Bed 2 ... Pump 3 ... Induction motor 4 ... Suction flange 5 ... Discharge piping 7 ... Pressure sensor 8 ... Flow sensor 9 ... Check valve 10 ... Control panel 12 ... Accumulator 20 ... Control panel housing 21 ... Bottom plate 22 ... Side plate 23 , 24 ... Opening / closing door 27 ... Opening 28 ... Noise filter 30 ... Radiating plate 31 ... Radiating fin 32 ... Inverter unit 33 ... Electronic control wiring board 34 ... Leakage breaker 321 ... Unit board 322 ... Power element 323 ... Smoothing capacitor 324 ... Inverter Control wiring board 325 ... Display panel 36 ... Screw

Claims (2)

[Claims] 1. A pump operation control for mounting a component forming an inverter circuit on a unit board to form an inverter unit, housing the inverter unit in a control panel housing, and controlling the pump driving motor by the inverter circuit. In the panel, a part of an outer wall of the control panel housing is formed by a heat radiating plate, and the inverter unit is attached to the inner surface of the heat radiating plate in contact with the pump operating control panel. 2. The outer wall of the housing in which the heat dissipation plate is provided is a bottom plate of the housing, and an opening is formed in the bottom plate, and the opening is closed by the heat dissipation plate. Control panel for pump operation.