JP4489496B2 - Circuit box and heat exchange ventilator - Google Patents

Description

  The present invention relates to an externally mounted circuit box and a high-place type heat exchange ventilator including the circuit box.

  Some heat exchange ventilators are installed in high places, such as behind the ceiling, and supply and exhaust air through ducts. In many cases, a circuit box is attached to a front surface of one side of a hexahedron main body box by screws. In addition, there exists what is disclosed by patent document 1 as this kind of prior art.

JP-A-5-322206

  The conventional circuit box in this type of heat exchange ventilator has been devised so that it does not drop even if the screw is removed during maintenance inspection. For example, a hook portion is provided, and the hook portion is hooked on the ridge portion of the main body box. The circuit box with this structure must be unscrewed, the hook part removed and the whole removed for maintenance, which is not easy to operate and the circuit box with the hook part removed may be accidentally dropped. Sometimes. Therefore, there is a type in which one side of the circuit box is hinged by a bush, and the other side is screwed. When performing maintenance and inspection, leave the screws on one side without removing the screws, unscrew the other parts and rotate them to open the lid. In this structure, there is no part that falls, and maintenance inspection can be performed easily, but the assembly work to fit a small bush is troublesome, the bush is lost during assembly, etc. The workability is bad and the cost is high There is a problem.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to obtain a circuit box that has a simple configuration, is easy to assemble and is low in cost, and does not fall. It is to obtain a heat exchange ventilator that is easy to maintain and inspect with a circuit box.

  In order to achieve the above-mentioned object, the present invention is such that one surface of an open box is assembled by a hinge structure so as to be rotatable, and the open surface side of the flange provided on this one surface and other portions is attached to the mounting surface. The circuit box is fixed to the screw and can be rotated in the counterclockwise direction by unscrewing the other part with respect to one surface. And an engaging hole in which the claw is rotatably engaged. At least one of the claws has an acute angle with respect to the mounting surface, and one of the engaging holes has an angled claw. A means for continuously providing a claw guide groove having a width substantially parallel to the mounting surface and substantially equal to the thickness of the claw on the surface in the protruding direction is adopted.

  According to the present invention, just by fitting one claw into an engagement hole without a claw guide groove and engaging the other claw with the claw guide groove at the same angle and fitting it into the engagement hole, Other parts are connected by a hinge structure. The flange provided on one side and the other part can be screwed to the mounting surface and the other part can be rotated by unscrewing the other part relative to the one side. The connection is not released and there is no risk of falling.

  The heat exchange ventilator of the present invention is attached to a high place such as a space behind the ceiling and supplies and exhausts air through a duct. In the approximate center of the hexahedron body box, a quadrangular prism-shaped heat exchanger is installed in a lateral direction so that its diagonal lines can be taken in and out by the upper and lower guide rails. An exhaust air blower and an air supply blower are incorporated in two rooms, four rooms on the upper, lower, left, and right sides of the main body box separated by the four ridges of the heat exchanger. The supply air flow and the exhaust air flow from the supply air blower and the exhaust air blower are passed through the secondary passage and the primary passage of the heat exchanger, respectively, and heat is continuously exchanged. A circuit box that protects connection terminals, control circuits, and the like is attached to the outer surface of one side of the main body box on the side where the exhaust blower is located by screws. Lead wires are routed from the circuit box to the air supply blower and the exhaust blower.

  The circuit box is made of a steel plate and configured as an open box on one side. One surface of the circuit box is pivotably assembled to another portion by a hinge structure. Screws are fixed so that the open surface side of the flange provided on the one surface and the other portion faces the mounting surface. The other part can be rotated counterclockwise by releasing the screw tightening of the other part with respect to one surface. The hinge structure is constituted by a claw serving as a rotation fulcrum and an engagement hole in which the claw is rotatably engaged, and the claw has an acute twist angle with respect to the mounting surface. One of the engagement holes is provided with a claw guide groove having a width substantially equal to the thickness of the claw substantially parallel to the mounting surface on the surface in the protruding direction of the claw.

  To assemble the circuit box, just fit one claw into the engagement hole without the claw guide groove, engage the other claw with the claw guide groove at the same angle, and fit it into the engagement hole. Other parts are connected by a hinge structure. It is possible to rotate the other part counterclockwise by fixing the screw to the mounting surface in the flange provided on the one surface and the other portion and releasing the screw tightening of the other portion with respect to the one surface. The connection between the one surface and the other part by the hinge structure is not released because the angle of the claw does not coincide with the claw guide groove, and the other part does not fall.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing the heat exchange ventilator of the present embodiment with the top plate removed, FIG. 2 is an exploded perspective view showing the configuration of the circuit box, and FIG. 3 is an enlarged side view showing the hinge structure of the circuit box FIGS. 4 and 4 are perspective views showing the assembly operation of the circuit box, and FIGS. 5A, 5B, 5C and 5D are side views showing the assembly process of the hinge structure of the circuit box.

  The heat exchange ventilator according to the present embodiment is mounted at a high place such as a space behind the ceiling, and supplies and exhausts air through a duct. In the substantially center of the hexahedron main body box 1, a quadrangular prism-shaped heat exchanger 2 is incorporated in a lateral direction so that the diagonal line thereof can be taken in and out by the upper and lower guide rails. An air supply blower 3 and an exhaust blower 4 are incorporated in two rooms, four rooms on the top, bottom, left, and right sides of the main body box 1 separated by four ridges of the heat exchanger 2. The exhaust air flow and the air supply air flow by the exhaust air blower 4 and the air supply air blower 3 are passed through the secondary passage and the primary passage of the heat exchanger 2, respectively, and heat is continuously exchanged. A circuit box 5 that covers and protects the connection terminals, the control circuit, and the like is attached to the outer surface of the main body box 1 on the side where the air supply blower 3 is located by screws. Lead wires are routed from the circuit box 5 to the exhaust blower 4 and the supply blower 3.

  As shown in FIG. 2, the circuit box 5 is made of a steel plate and is configured as an open rectangular box. One side surface 6 of the circuit box 5 is rotatably attached to another portion 7 by a hinge structure. The surface of the flange 8 provided on the one side surface 6 and the other portion 7 is screw-fixed toward the mounting surface 9. Maintenance inspection of the control circuit and the like can be performed by rotating the other portion 7 counterclockwise by releasing the screw tightening of the other portion 7 with respect to the one side surface 6. As shown in FIG. 2, the hinge structure is composed of two claws 10 serving as pivot points and two engagement holes 11 in which the claws 10 are rotatably engaged. A twist angle of 9 (30 degrees in this example) is attached to 9. One of the engagement holes 11 is provided with a claw guide groove 12 having a width substantially equal to the thickness of the claw 10 substantially parallel to the mounting surface 9 on a surface in the protruding direction of the claw 10.

  The circuit box 5 is assembled by fitting one claw 10 into the engagement hole 11 without the claw guide groove 12 and the other claw 10 as shown in the assembly process of A, B, C, D in FIGS. By simply inclining and engaging the claw guide groove 12 inward so as to match the angle and fitting the claw guide groove 12 into the engagement hole 11, the one side surface 6 and the other portion 7 are connected by the hinge structure to complete. Then, the flange 8 provided on the one side surface 6 and the other portion 7 is screwed to the mounting surface 9 so as to cover the control circuit and the like. When conducting maintenance and inspection of lead wires, control circuits, etc., the other side 7 is unscrewed from one side 6. The other part 7 from which the screw has been removed can be opened so as to rotate counterclockwise and open the lid. The connection between the one side surface 6 and the other portion 7 by the hinge structure is not released because the angle of the claw 10 does not coincide with the claw guide groove 12 in the rotation range, and from the one side surface 6 where the other portion 7 is screwed. It will not fall. As in the present embodiment, the width of the claw guide groove 12 is made larger than the thickness of the claw 10 in the shape of a groove 13 at a portion far from the engagement hole 11, thereby assembling the claw 10 into the engagement hole 11. It becomes easier. In addition, for the claw 10 and the engagement hole 11 of the hinge structure, it is the circuit box 5 having no projecting portion when the engagement hole 11 is provided on one side surface 6 and the claw 10 is provided inward on the other portion 7. Appearance and operability are improved. As described above, the heat exchange ventilator provided with the circuit box 5 has a simple configuration of the circuit box 5 and is easy to assemble, so that cost reduction can be achieved.

It is a perspective view which removes a top plate and shows a heat exchange ventilation apparatus. (Embodiment 1) It is a disassembled perspective view which shows the structure of a circuit box. (Embodiment 1) It is an enlarged side view which shows the hinge structure of a circuit box. (Embodiment 1) It is a perspective view which shows the assembly operation of a circuit box. (Embodiment 1) It is a side view which shows the assembly process of the hinge structure of a circuit box. (Embodiment 1)

Explanation of symbols

  5 circuit box, 6 one side surface, 7 other part, 8 flange, 9 mounting surface, 10 claw, 11 engagement hole, 12 claw guide groove, 13 groove shape.

Claims (4)

One surface of the open box is assembled by a hinge structure so as to be rotatable, and the flanges provided on the one surface and the other portions are fixed with screws with the open surface side facing the mounting surface. A circuit box which can rotate the other part by releasing the screw tightening of the other part, and a pair of claws having a flat plate section whose hinge structure serves as a pivot, and the claw Is a pair of engaging holes that are rotatably engaged, and at least one of the claws is provided with an acute angle inclined to the rotation direction side that opens the other portion with respect to the mounting surface. A circuit box in which a claw guide groove having a width substantially parallel to the mounting surface and substantially equal to the thickness of the claw is provided on one side of the joint hole on an angled claw projecting direction.   The circuit box according to claim 1, wherein the width of the claw guide groove is larger than the thickness of the claw at a portion far from the engagement hole.   3. The circuit box according to claim 1, wherein an engagement hole is provided on one surface and a claw is provided inwardly on another portion. A high-place installation type heat exchange ventilator comprising the circuit box according to any one of claims 1 to 3 on an attachment surface on one side of the main body.

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