JP2000060135A - Assembly case of inverter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize reduction in cost by raising the mechanical strength and curtail the number of parts and man-hours at the same time, as regards the assembly case of an inverter device. SOLUTION: In an assembly case of an air-cooled inverter device, which consists of an assembly of a housing cover 2 surrounding the peripheral four sides, baffle covers 3 arranged in the suction port and the discharge port of cooling air opening at both its end faces, and an installation adaptor 4 to serve as a seat plate for installation of the case, and besides in which a room having accommodated main circuit parts, control circuit parts, etc., within the case and an air duct room having accommodated a heat radiation fin and a blow fan and allows cooling air to pass are partitioned, aluminum die cast parts are adopted for the air baffle cover 3 and the installation adaptor 4. Moreover, the baffle cover is covered with a housing cover and both are fastened to each other by screws, and also the installation cover is fixed selectively to either of the mounting seat faces corresponding to an in-board installation position A and an outside cooling position B made at the end face of the baffle cover with bolts, and also each kind of functional parts including reinforcing ribs, etc., are added to the baffle cover and the installation cover, and they are molded integrally by die cast.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an assembly case applied to an inverter device having a relatively large current carrying capacity.

[0002]

2. Description of the Related Art A main circuit section, a control circuit section (printed board) comprising a power semiconductor module such as an IGBT and a diode, a transformer, a smoothing capacitor, an electromagnetic contactor, and the like.
The air-cooled inverter unit, which combines the terminal block assembly with the radiation fins and the blower fan, has a single unit configuration in which the above parts are assembled in an assembly case except for special products, and is used by installing it on a control panel, etc. You.

[0003] In this case, as a method of installing the inverter device, an in-panel installation method in which the whole of the inverter device is housed in a panel, and air in the panel is passed through the case of the inverter device to be cooled by air. Alternatively, the front side of the case incorporating the circuit part of the inverter device is housed in the panel, and the rear side of the case incorporating the radiation fins and the blower fan protrudes backward from the panel to blow outside air. There is an external cooling system, and the installation method to be adopted is determined by the user side. In general, the installation posture of the inverter device is such that the air suction port of the assembly case is on the lower side and the discharge port is on the upper side, and the cooling air flows through the inside of the case from below to above, aiming at the chimney effect of thermal convection. Is blown.

[0004] On the other hand, the assembly case of the inverter device includes a jacket cover surrounding four peripheral surfaces, and a wind guide cover provided at a cooling air suction port and a discharge port opened at both end faces thereof.
An assembly with an installation adapter that serves as a seat plate for installing the case, and a room that accommodates semiconductor modules, control circuit printed circuit boards, terminal blocks, etc. in the case, cooling fins, and a blower fan to cool air. It becomes the structure which divided the wind tunnel room which ventilates.

In the conventional assembly case, the outer casing, the air guide cover, and the mounting adapter are all made of a sheet-metal processed product of a steel plate. 6 and 7 (a) to 7 (c). In FIG. 6, an assembly case 1 is composed of an outer cover 2, which surrounds four sides thereof, a wind guide cover arranged at an air inlet and an outlet, and an installation adapter 4 serving as an installation seat plate for fixing the case to a control panel. It is composed of a solid. Reference numeral 5 denotes a terminal block incorporated at the end of the assembly case 1.

Here, the wind guide cover 3 is shown in FIG.
As shown in the figure, it is a sheet metal processed product of a thin steel plate, and a large number of ventilation holes 3a through which cooling air flows are punched on the plate surface, and furthermore, a peripheral region thereof and a bent flange portion are provided with fastening screws. The screw hole 3b is tapped. On the other hand, the installation adapter 4 is a sheet metal processed product formed by bending, tapping, and drawing a thin steel plate, and is adapted to the installation position on the control panel as shown in FIGS. 7 (b) and 7 (c). To 2
Various types of adapters 4A and 4B are prepared. A round hole 4a is opened as a through hole for a mounting bolt in one leg of one adapter 4A, and a mounting bolt is passed through a leg of the other adapter 4B. A U-shaped cutout groove 4b is opened as a hole so that the adapter can be used properly. Further, bolt holes 4c are drawn on the left and right side walls of the adapters 4A and 4B so as to be bolted to the outer cover 2.

[0007]

However, the above-mentioned conventional assembly case has the following problems to be solved. That is, although the total weight of the inverter device depends on the magnitude of the current carrying capacity, it is several tens of kilograms for a general-purpose product applied to control of a motor, and 50 kg for a large-capacity device.
Therefore, the assembled case is required to have sufficient mechanical strength to withstand lifting movement and the like, as well as earthquake resistance against rotation of the blower fan incorporated in the case.

In this respect, in a conventional assembly case made entirely of a sheet metal product of a thin steel plate, reinforcing ribs are provided on the sheet metal product in order to give a required strength to a mounting adapter to which weight and vibration load are applied, a wind guide cover, and the like. It is necessary to weld, increase the number of fastening bolts, and so on. Also, for the installation adapter, two types of adapter must be prepared according to the installation position of the inverter device. Man-hours such as welding and the number of parts are increased, and the cost of manufacturing an assembly case is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to solve the above-mentioned problems and to reduce the number of parts and man-hours while securing the strength required for a case, thereby achieving cost reduction. It is an object of the present invention to provide an improved inverter device assembly case.

[0010]

According to the present invention, in order to attain the above object, according to the present invention, a jacket cover surrounding four peripheral surfaces and cooling air inlets and outlets provided at both end surfaces thereof are provided. It is an assembly of a wind cover and an installation adapter that serves as a seat plate for installing the case. The inside of the case is cooled by housing the main circuit components, the control circuit, etc., the radiating fins and the blower fan. The wind guide cover and the installation adapter are made of a die-cast product such as aluminum, and the outer cover is placed between the wind guide covers and screws are fastened between them. In addition, the installation adapter is formed by selecting one of the mounting seat surface for installation in the panel formed on the end face of the wind guide cover and the mounting seat surface for external cooling and fastening with a bolt (claim 1). Typically The airflow guide, the mounting adapter to configure in the manner as follows follow.

(1) Die-cast product air guide cover has screw holes for screwing the outer cover on the left and right sides, an octagonal vent opening obliquely cut at four corners and opening at the center of the cover, back side Reinforcing ribs distributed around the vent hole, an adapter mounting seat surface for distributing the front and rear edges of the cover with the vent hole interposed therebetween and for selectively mounting a mounting adapter, and a bolt opened in the adapter mounting seat surface. A hole, a ground terminal pedestal protruding forward from an edge of the cover in an eave shape, a hanging ear for slinging protruding from left and right side edges, and a slit-shaped fitting groove for inserting an edge of a sheet metal member are formed. 2).

(2) The installation adapter for the die-cast product is a leg piece having an L-shaped cross section having two sides equal in length, reinforcing ribs distributed in the longitudinal direction and straddling between the L-shaped leg pieces, and each leg. A bolt through hole that opens separately for each piece and bolts the adapter to the wind guide cover, a round hole that opens on one leg piece and passes the installation bolt, and a cutout hole that opens on the other leg piece and passes the installation bolt It is formed (claim 3).

According to the above configuration, the use of die-cast products for the air guide cover and the installation adapter significantly increases the mechanical strength of the assembly case as compared with the sheet metal product of thin steel plate, and controls the inverter device. When installing on a panel, etc., select one of the adapter mounting seat surfaces formed on the front edge and rear edge of the wind guide cover according to the choice of installation inside the panel or external cooling, and install the installation adapter Can easily respond.

In the wind guide cover, the load stress applied to the four corners is particularly reduced by making the ventilation holes octagonal, so that the strength of the case is increased. Further, the reinforcing ribs, the ground terminal pedestal, and the suspension are provided. The cover itself can be provided with an additional function by integrally molding each part structure such as the ear part by die casting. In addition, the strength of the mounting adapter can be improved by integrally forming the reinforcing ribs with the leg pieces having an L-shaped cross section, and by changing the mounting direction to the wind guide cover, a round hole or a through hole for the mounting bolt is provided. Any one of the cutout holes can be selected, and the parts can be shared.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to FIGS. In the drawings of the embodiment, the same members corresponding to those in FIG. 6 are denoted by the same reference numerals. First, FIGS. 5 (a) to 5 (d) show the assembly structure of the entire inverter device and the installation posture on the control panel. The inverter device is installed in a panel such as a control panel in a vertical position with the cooling air suction port of the assembly case on the lower side and the discharge port on the upper side as shown in the figure. A and B indicate installation positions of the entire apparatus, which is housed in a panel, and external cooling (cooling fins and a blower fan are protruded behind the panel and installed on the panel), respectively.

On the other hand, corresponding to the installation positions A and B, a main circuit component (IGBT, diode, transformer, etc.), a control circuit printed board, a terminal block, etc. A chamber accommodating various components 6 is provided, and a wind-tunnel chamber accommodating a radiation fin 7 and a blower fan 8 and passing cooling air is defined in a rear half portion. Reference numeral 9 denotes a smoothing capacitor, part of which projects into the wind tunnel chamber.

Here, the assembly case 1 basically comprises a jacket cover 2 which is a sheet metal product of a thin steel plate surrounding four peripheral surfaces in the same manner as in the prior art, and a cooling air suction port and a discharge port opened on the lower and upper surfaces thereof. Although it is an assembly of the air guide cover 3 disposed at the outlet and the installation adapter 4 which is a seat plate for installing the case, in the illustrated embodiment, the air guide cover 3 and the installation adapter 4 are made of an aluminum die-cast product, and The installation adapter 4 is bolted to the end surface of the wind guide cover 3. FIG.
FIG. 2 is a perspective view of the assembly structure (installation in the panel) of the assembly case 1 as viewed from an air suction port side (lower surface side).

Next, the detailed structure of the wind guide cover 3 and the installation adapter 4 which are die-cast products will be described with reference to FIGS. 2 (a) and 2 (b), the air guide cover 3 is made of an aluminum die-cast product having a sufficient thickness.
On the left and right sides, screw holes 3c for screwing the cover 2 (see FIG. 1), octagonal vents 3d opened at the center of the cover by diagonally cutting the four corners, and around the vent on the back side. Dispersed reinforcing ribs 3e, adapter mounting seats 3f and 3g for selectively mounting the mounting adapter by allocating the front and rear edges of the cover with the ventilation opening interposed therebetween, and bolt holes 3h drilled in the adapter mounting seat. A ground terminal pedestal 3i protruding forward from the edge of the cover in an eaves shape;
, A nameplate sticking pedestal (concave surface) 3i-1 projecting from the left and right sides, a hanging ear 3j projecting from the left and right side edges and having hanging holes 3j-1 opened, and an edge of the sheet metal member. A slit-shaped fitting groove 3k to be inserted is integrally formed. In addition, 3j-2 is an engagement step portion with a sheet metal member formed on the back surface of the ear portion 3j, and 3d-1 is a ventilation port 3 on the back surface side of the cover.
The adapter mounting seat surface 3f is formed in a concave shape, which is an eave-shaped edge cutting step formed in the peripheral region of d.

On the other hand, as shown in FIGS. 3 (a) and 3 (b), the mounting adapter 4 is a leg piece having an L-shaped cross section having the same length d on two sides, and is distributed in the longitudinal direction. Triangular reinforcing ribs 4f straddling between 4d and 4e, and each of the leg pieces are separately opened in the longitudinal direction so that the adapter 4 is bolted to the adapter mounting seats 3f and 3g of the wind guide cover 3 (see FIG. 2). 4g, a pair of left and right round holes 4h opened in one leg 4d and through which mounting bolts pass, and a cutout hole 4i opened in the other leg 4e in alignment with the round hole 4h. Further, an engaging step 4j that fits into the side edge of the concave adapter mounting seat surface 3f is integrally formed on the left and right side edges of each of the leg pieces 4d and 4e.

When the assembly case 1 is constructed by combining the cover 2 with the wind guide cover 3 and the installation adapter 4, first, the unit assembly of the inverter device (both sides of the unit base (sheet metal product)) (An assembly in which a main circuit section, a control circuit section, a terminal block, a radiation fin, and a blower fan are separately mounted) are connected to the air intake side and discharge side wind guide covers 3. In this case, both ends of the unit base are bent in an L-shape, and the bent portion is fitted into a slit-shaped fitting groove 3k formed in the end of the wind guide cover 3 and connected. Next, the air guide covers 3 on the suction side and the discharge side
The outer cover 2 is put on the outer cover 2 and fixed to the side surface of the wind guide cover 3 with screws.
Is bolted to the end face of the wind guide cover 3.

In this case, the installation position of the installation adapter 4 is determined according to the installation condition of the inverter device on the control panel (in-panel installation position A or external cooling position B shown in FIG. 5). Adapter mounting seat 3 formed on
Select either f or 3g. That is, FIG. 4A shows a state (corresponding to FIG. 1) in which the adapter 4 is fastened to the adapter mounting seat surface 3f of the wind guide cover 3 with the bolt 10 in accordance with the installation position A in the panel. b) shows a state where the adapter 4 is bolted to the adapter mounting seat surface 3g of the wind guide cover 3 in accordance with the external cooling position B. In FIG. 4 (a), the leg 4d of the adapter 4 is applied to the rear adapter mounting seat surface 3g and fastened with a bolt 10. In FIG. 4 (b), the direction of the adapter 4 is reversed. The leg piece 4e is fastened to the adapter mounting seat surface 3f on the front side with a bolt 10.

The total weight of the assembled inverter device as described above is several tens of kilograms. When handling the transfer, the suspension ears 3j projecting from the left and right ends of the wind guide cover 3 are suspended. A wire is hung on the hole 3j-1 and slung on a crane, a chain block or the like and lifted and transferred. To install and fix the inverter device in a control panel or the like, the mounting bolt 11 is inserted into a round hole 4h opened in the leg 4d of the installation adapter 4 or a cutout hole 4i opened in the leg 4e to the frame on the panel side. To conclude. The terminal screw 3 is attached to the ground terminal base 3i of the wind guide cover 3.
2 is attached.

[0023]

As described above, according to the structure of the present invention, the following effects can be obtained. (1) According to the configuration of claim 1, the wind guide cover and the installation adapter are made of a die-cast product, and the wind guide cover is covered with the outer cover, and the two are screwed together. By selecting either one of the mounting surface on the end face for mounting inside the panel and the mounting seat surface for external cooling and tightening with bolts, the strength is significantly greater than that of the conventional assembly case made of thin steel sheet metal products When installing the inverter device on a control panel, etc., be sure to select either the inside of the panel or the adapter mounting seat surface formed on the front edge or the rear edge of the wind guide cover according to the choice of external cooling. It can be easily handled by selecting the installation adapter and installing it. In addition, bending, tapping,
In addition, since the welding work of the reinforcing rib is not required, the manufacturing cost can be reduced.

(2) By constructing the wind guide cover as in claim 2, the load stress applied to the four corners of the ventilation hole is reduced, and the strength of the case is increased.
Further, by integrally forming the respective structures such as the reinforcing ribs, the ground terminal pedestal, and the hanging ears on the cover, the wind guide cover itself can have an additional function. (3) Furthermore, by adopting the configuration of claim 3 for the installation adapter, mechanical strength can be increased as compared with a sheet metal product, and the mounting bolt can be changed by changing the direction of the adapter attached to the wind guide cover. Either a round hole or a notch hole can be selected as the through hole, and parts can be shared.

[Brief description of the drawings]

FIG. 1 is an external perspective view of an assembly case end in an assembled state of an inverter device according to an embodiment of the present invention.

FIG. 2 is a detailed structural view of a wind guide cover in FIG. 1,
(a) and (b) are perspective views of the cover as viewed from the front and back, respectively.

FIG. 3 is a detailed structural view of the installation adapter in FIG. 1, wherein (a) and (b) are perspective views of the adapter as viewed from the front and back, respectively.

4 is an external perspective view of a state in which the installation adapter of FIG. 3 is mounted on the wind guide cover of FIG. 2, and (a) and (b) show a state in which the adapter is mounted at a panel installation position and an external cooling position, respectively. Figure representing

FIG. 5 is a diagram showing an assembling structure of the entire inverter device according to the embodiment of the present invention and a mounting posture to a control panel;
(a) is a top view, (b) is a front view, (c) is a side view, and (d) is a bottom view.

FIG. 6 is an external perspective view of an end of an assembling case in an assembled state of a conventional inverter device.

7 is a detailed structural view of a case part in FIG. 6,
(a) is an external perspective view of the air guide cover, (b) and (c) are external perspective views of the installation adapter, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Assembly case 2 Outer cover 3 Wind guide cover 3c Screw hole 3d Ventilation opening 3e Reinforcement rib 3f, 3g Adapter mounting seat surface 3h Bolt hole 3i Ground terminal pedestal 3j Hanging ear 3k Fitting groove 4 Installation adapter 4d, 4e Leg piece 4f Reinforcement rib 4g Bolt through hole 4h Round hole (installation bolt through hole) 4i Notch hole (installation bolt through hole) 6 Main circuit and control circuit parts 7 Radiation fin 8 Blower fan 11 Installation bolt

Claims (3)

[Claims] An assembly case of an air-cooled inverter device comprising a main circuit section including a semiconductor module, a control circuit section, a radiating fin, a blower fan, and the like thermally coupled to the main circuit parts, surrounding four peripheral surfaces. It is an assembly of an outer cover, a cooling air inlet opening at both end surfaces, a wind guide cover arranged at an outlet, and an installation adapter that serves as a seat plate for installing the case. In a room containing circuit components, a control circuit section, and the like, and a wind tunnel room containing a radiating fin and a blower fan and through which cooling air is passed, the air guide cover and the installation adapter are made of a die-cast product. None, and cover the wind guide cover with the outer cover, fasten the screws between them, and install the mounting adapter on the end face of the wind guide cover for mounting inside the panel and for external cooling. Assembly case of the inverter apparatus, characterized in that the bolted Re or select one. 2. An assembling case according to claim 1, wherein the wind guide cover as a die-cast product has screw holes for screwing the outer cover on the left and right side surfaces thereof, and four corners are obliquely cut to open in the center of the cover. An octagonal ventilation port, reinforcing ribs distributed around the ventilation port area on the back side, an adapter mounting seat surface for selectively mounting the installation adapter on the front edge side and the rear edge side of the cover with the ventilation port interposed therebetween; A bolt hole opened in the adapter mounting seat surface, a ground terminal pedestal protruding forward from an edge of the cover in an eave shape, a hanging ear for slinging protruding from left and right side edges, and a slit shape for inserting an edge of a sheet metal member. An assembly case for an inverter device, wherein a fitting groove is formed. 3. An assembling case according to claim 1, wherein the installation adapter as a die-cast product is an L-shaped leg piece having two sides equal in length, and is distributed in the longitudinal direction between the L-shaped leg pieces. Reinforcing ribs that straddle, bolt-through holes that are distributed and opened for each leg, and bolts the adapter to the wind guide cover, round holes that open on one leg and through which mounting bolts pass, and holes that open on the other leg A notch hole through which a mounting bolt is passed to form an inverter device assembling case.