JP2773008B2 - Power unit and its cooling structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a power unit, a cooling structure thereof, and a structure for mounting the power unit on a base of industrial equipment. This power unit is
It contains the power circuit part of industrial equipment that uses large power, such as machine tools and injection molding machines.

[0002]

FIG. 8 shows a general structure of a conventional power unit 1 in which a power circuit member 4 is mounted on a mounting plate 3 of a base 2.
Are mounted (hereinafter, referred to as mounted components). The base 2 has front and rear walls 5 and 6 and a bottom wall 7, and has a structure in which the front and rear walls are joined by a mounting plate 3. The base 2 having such a structure is reinforced by the mounting plate 3, but has a low strength against a partially applied force because it is basically a structure formed by sheet metal processing. Therefore, the conventional power unit 1 can be placed only on a flat surface. Power unit 1
When the power unit is moved by using a forklift, the power unit is heavy, so that when the power unit is lifted, a force partially acts on the bottom wall 7 to deform the bottom wall 7, which may adversely affect internal circuit components. . For this reason, it was not easy to store the power unit 1 in the space inside the base of the industrial equipment.

In the conventional power unit 1, all cables 8 for wiring must be routed above the flat bottom wall 7, and there is a danger that the cables may generate heat and connection points may fall off due to excessive wiring. there were. Also, when the power unit 1 is stored in the space inside the base of the industrial equipment, the power unit 1 is often stored in the storage space by horizontal movement. However, there are no special guides for storage,
In some cases, the power unit 1 could collide with the base.

On the other hand, since the power unit 1 needs to be protected from contamination by the external environment such as water, oil, dust, etc.
As shown in FIG. 8, it is housed in a housing 9 that can be sealed. Also,
Since many of the mounted power parts 4 generate heat, an air inlet 10 with a filter and an exhaust fan 11 are attached to the housing 9 to cool the heat accumulated inside the housing 9 to the outside. Structure is adopted. However, in this structure, although a filter is attached to the intake hole 10, since outside air is introduced into the housing, fine dust adheres to the surface of the mounted component, and inspection and cleaning in a short cycle are required. is there. Further, when the filter contains water or oil, there is a danger that mist-like water droplets or oil droplets may enter on the flow of the introduced outside air. There is also a completely sealed cooling structure that separates the inside of the housing from the outside and discharges the heat inside to the outside with a heat exchanger, but this structure has a high performance for the heat exchanger because heat is indirectly discharged. It requires things and is expensive.

[0005]

SUMMARY OF THE INVENTION A power unit capable of increasing the rigidity of a base in a power unit, expanding a cable wiring space in the power unit, adopting a structure in which the power unit can be easily housed in a space in a base, and performing efficient cooling. It is an object to provide a cooling structure.

[0006]

The power unit has the following configuration. A power circuit member is mounted on a base having a bottom wall. On the vertical reinforcing frame member the reinforcing frame member of vertical and horizontal to the bottom of the base
Attach so as to form a grid with a horizontal reinforcing frame material . The lowermost reinforcing frame member is arranged on the lower surface of the bottom wall and directed in the longitudinal direction of the base. It may form a space cabling guide space of the inner unit provided cable cover between the bottom of the reinforcement frame member.

The structure in which the power unit is housed in the space in the base of the machine is as follows. The base shall have a frame structure. The power unit has two reinforcement frames on the bottom of the bottom wall.
It shall be provided in parallel. The power unit is housed between the lower parallel frame members of the frame structure in the base . The power unit is housed in the space inside the base, with the parallel frame material on the base serving as a guide rail and the reinforcing frame material on the lower surface of the bottom wall serving as a guide member moving along the rail.

The cooling structure of the power unit has the following structure. The power unit is housed in a closed housing. The power unit includes a base having a forced exhaust duct and a power circuit member having a radiation fin. The power circuit member is mounted on the base with the radiation fins exposed to the forced exhaust duct. Both ends of the forced exhaust duct are
It is opened to the outside air through the exhaust hole. A heat exchanger that releases heat from the internal space to the external space is attached to the housing. The space inside the base of the frame structure to which the power unit is mounted may be closed by a base panel to form a closed housing.

[0009]

According to the first aspect of the present invention, a horizontal reinforcing member is provided on the vertical reinforcing frame member.
The reinforcing frame member in which the strong frame members are assembled in a lattice shape increases the rigidity of the housing. The cable wiring guide space according to the second aspect of the present invention enables cable wiring at the lower portion of the bottom wall of the housing. According to the third aspect of the present invention, the structure in which the parallel frame member at the lower part of the base is used as a guide and the reinforcing frame member at the lower part of the housing is used as a guide member makes it easy to store the power unit in the space inside the base.

According to the fourth aspect of the present invention, the enclosed space of the housing protects the components mounted on the power unit from dust and the like from outside air, the forced exhaust duct removes heat from the radiator, and the heat exchanger has the enclosed space. Remove heat. The housing according to the fifth aspect of the present invention enables the power unit housed in the base space to be forcibly exhausted and cooled by heat exchange.

[0011]

FIG. 1 shows an example of a power unit according to the present invention. The power unit 1 includes a base 2, a forced exhaust duct 12, a horizontal reinforcing frame 13a placed on a vertical reinforcing frame 13b, and a reinforcing frame 13 (a, b) assembled in a grid and mounting components. 4 (ac). Base 2 and forced exhaust duct 1
The bottom wall 7 and the shielding wall 14, which form part of the base 2 and the base 2, are integrally formed by sheet metal working. The forced exhaust duct 12 is arranged in the longitudinal direction (front-rear direction) at the center in the width direction (left-right direction) of the base 2, and both side walls thereof are the mounting plate 3.

The reinforcing frame member 13 (a, b) is a steel material having a square cross section having sufficient strength with respect to the weight of the power unit 1. The reinforcing frame members 13a are arranged in the horizontal direction (left-right direction ) and fixed at predetermined intervals to the upper surface side of the bottom wall 7, and the reinforcing frame members 13b are arranged in the vertical direction (front-rear direction ) on the lower surface of the bottom wall 7. , Are fixed in parallel with an interval in the left-right direction. In other words, the reinforcing frame members 13 (a, b) have a pair of left and right parallel reinforcing frame members 13a arranged in a lattice shape in a plan view above the lower reinforcing member 13b parallel to the longitudinal direction . .

The mounted components 4a and 4b are power circuit members having a large amount of heat, such as amplifiers, each of which has a radiation fin 15 on the back side. The radiation fin 15 is disposed inside the forced exhaust duct 12, that is, in the air circulation. It is mounted so as to be exposed to the road (see FIGS. 4 and 6). The mounted component 4c has no particular heat generation at the connector portion, and is mounted on the base 2 while being isolated from the heat generation portion by the shielding wall 14. Bottom wall 7 of base 2
The point which corresponds to the lower surface of the lower mounting part 4c a rear portion of the reinforcing frame member 13 arranged in parallel spaced-apart, cable cover 16 is fixed between the reinforcing frame member 13 b, for cabling Guide space 17 is formed. The cable 8 from the mounting component 4c to another mounting component 4 is routed through the guide space 17.

A power unit 1 having such a structure
Since the base 2 is reinforced by the reinforcing frame members 13 (a, b) assembled in a vertical and horizontal lattice , the base 2 is distorted even if a heavy unit is placed in a place having irregularities. There is no adverse effect on the mounted component 4. Also,
The cable 8 can be routed with a margin inside the unit by the guide space 17 for cable routing. In addition, the power unit 1 reinforced in this way can be lifted and transported by inserting a hand lifter or a fork of a small lift between the lower reinforcing frame members 13b (FIG. 5).

In this embodiment, the power unit 1 is housed in an internal space of a base 18 (FIG. 45 ) having a frame structure. Figure 5 is a Ru-based 18 der of the injection molding machine. The power unit 1 conveyed by a small lift or the like is provided between the lower parallel frame members 19, 19 (FIGS. 4 and 5) of the frame structure. The reinforcing frame members 13b, 13b are stored in the base inner space 20 by horizontal movement as guide members for moving along the guide rails. The stored state is shown in FIG. 4, but the upper surface of the reinforcing frame member 13b is made substantially equal to the upper surface of the parallel frame member 19 on the base 18 side.

In FIG. 4, reference numeral 21 denotes a thin connecting plate which is mounted in place of a frame member located below an end on the side on which the power unit 1 having the frame structure is moving.
Are easily inserted into the base internal space 20. According to this storage structure, since the power unit 1 is guided at the time of insertion, it is stored in the base internal space 20 without colliding with the base 8. The base interior space 20 in which the power unit 1 is stored has an upper surface, front and rear side surfaces, and left and right side surfaces shielded by a base panel 22, and a bottom surface shielded by a bottom wall 7 of the base 2 to form an enclosed space. Is done. Of these, the base panel 22a on the front side (one of the left and right side surfaces)
And base panel 22 on the side where power unit 1 is inserted
b (shown by a broken line in FIG. 5) can be opened and closed.

FIGS. 6 and 7 show a cooling structure of the power unit 1, and the power unit 1 is housed in a closed casing 9. In the figure, the power unit 1
Is omitted, but is almost the same as the structure of FIG. However, the bottom wall 7 of the base 2 is the forced exhaust duct 1
2 is also shielded, and the lower reinforcing frame member 13b is fixed to the lower surface of the housing 9 separately from the power unit 1.

In the housing 9, both ends of the forced exhaust duct 12 of the power unit 1 are connected to suction / exhaust holes 24 (a, b) provided in the housing 9 via a sealing member 23. Thereby, both ends of the forced exhaust duct 12 are opened to the outside air, and the internal space of the housing 9 and the internal space of the forced exhaust duct 12 are isolated. Either an intake fan or an exhaust fan is attached to one of the intake / exhaust holes 24 (a, b), and external air is forcibly introduced into the internal space of the forced exhaust duct 12 and discharged. The housing 9 is further provided with a heat exchanger 25 for releasing heat from the internal space to the external space.

With such a cooling structure, the closed casing 9 is provided.
The heat of the mounted components 4 mounted on the power unit 1 in the
First, the forced exhaust duct 12 is passed through the radiation fins 15.
It is discharged by the outside air flowing inside. Then, secondly, the heat is released into the internal space of the housing 9 and indirectly discharged to the outside by the heat exchanger 25.

As described above, the mounted components 4 in the power unit 1 are efficiently and inexpensively cooled by the combined use of the direct heat discharge to the outside air by the radiation fins 15 and the indirect heat discharge by the heat exchanger 25. You. In addition, since the mounted component 4 does not come into contact with the outside air except for the radiation fins 15, there is no possibility that dust adheres and breaks down.

In addition to the case where the sealed housing 9 is configured as one independent box, the base panel 22 (a to 22) attached to the base 18 as shown in FIGS.
According to d ), the internal space 20 in the base may be formed in the closed casing 9. In the embodiment, the heat exchanger 25 is mounted on the rear base panel 22c with respect to the front base panel 22a which can be freely opened and closed. An intake hole 24a is provided in the front base panel 22b. The exhaust hole 24b is an open end face of the forced exhaust duct 12. The above is one embodiment, and the present invention is not limited to the illustrated specific configuration. For example, the power unit 1
It may be stored in the base interior space 20 from the front side.

[0022]

According to the first aspect of the present invention, the rigidity of the power unit is increased, and the power unit can be easily transported. There is no need to worry about the function of the mounted component being affected by the deformation of the base during transport. According to the second aspect of the present invention, cable wiring in the power unit can be arranged without difficulty, and unexpected failures can be reduced. According to the invention of claim 3, the power unit can be easily mounted in the internal space of the base. According to the fourth and fifth aspects of the present invention, the power unit is efficiently cooled, and the failure of the mounted components is reduced. Further, the capacity of the heat exchanger can be relatively small, and the cost of the apparatus can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a power unit.

FIG. 2 is a front view of the power unit.

FIG. 3 is a rear side view of the power unit.

FIG. 4 is a side view (partial cross section) of the power unit housed in a space inside the base.

FIG. 5 is a perspective view showing a storage state of the power unit.

FIG. 6 is a horizontal sectional view showing a cooling structure of the power unit.

FIG. 7 is a vertical sectional view showing a cooling structure of the power unit.

FIG. 8 is a perspective view of a power unit (conventional example).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Power unit 2 Base 3 Mounting board 4 Mounting component (power circuit component) 8 Cable 12 Forced exhaust duct 13 Reinforcement frame material 15 Radiation fin 16 Cable cover 17 Wiring guide space 18 Base 20 Base space 22 Base panel 24 Suction / exhaust hole 25 heat exchanger

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-54-127579 (JP, A) JP-A-3-106795 (JP, U) JP-A-63-145391 (JP, U) JP-A-4-127 111793 (JP, U) Hira 4-107891 (JP, U) Hira 4-25287 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H05K 7/20 B23Q 11 / 12

Claims (5)

(57) [Claims] 1. A are substrates implement power circuit member having a bottom wall, the base vertical reinforcing frame reinforcing frame member of the vertically and horizontally on the bottom of the
A power unit characterized in that a horizontal reinforcing frame member is mounted on a member so as to form a grid, and a lowermost reinforcing frame member is disposed on a lower surface of a bottom wall and is directed in a longitudinal direction of the base. And characterized in that wherein is formed a space cabling guide space of the inner unit provided cable cover between the bottom of the reinforcement frame member of vertical and horizontal lattice shape braided reinforcing frame member The power unit according to claim 1, 3. A structure in which the power unit according to claim 1 is housed in a space in a base of the machine, wherein the base has a frame structure, and the power unit guides the parallel frame material between lower parallel frame materials of the frame structure. A power unit storage structure, wherein the power unit is stored as a rail in a space inside the base as a guide member for moving a reinforcing frame material on the lower surface of the bottom wall along the rail. 4. The power unit is housed in a closed casing, wherein the power unit has a power circuit member provided with a radiation fin on a base having a forced exhaust duct, the radiation circuit fin being exposed to the forced exhaust duct, Implemented
A power unit characterized in that both ends of the forced exhaust duct are opened to the outside air through suction and exhaust holes provided in the housing, and a heat exchanger for releasing heat of the internal space to the external space is attached to the housing. Cooling structure. 5. The cooling structure for a power unit according to claim 4, wherein a space inside the base of the frame structure in which the power unit is mounted is sealed with a base panel to form a closed housing.