MXPA98000733A - Fan motor housing for microon oven - Google Patents

Abstract

A microwave oven that has a compartment of electrical components, a fan installed in the compartment of electrical components to direct the external air into the compartment of electrical components and cool the electrical components, and a fan motor that drives the fan, which it includes a fan motor box secured to a rear wall of the microwave oven for housing the fan motor, and formed by upper, lower, left, and right panels, to have a square shape. These panels are joined to the back wall without gaps. The fan motor housing of the invention is insulated from the outside, and keeps foreign objects away from the fan motor when repairing the electrical components in the electrical component compartment, thereby preventing damage to the fan motor. The most representative figures of the invention are number 3 and

Description

FAN MOTOR HOUSING FOR MICROWAVE OVEN BACKGROUND OF THE INVENTION (1) Field of the Invention The present invention relates to a microwave oven, and more particularly to a fan motor housing for a microwave oven housing a fan motor. j. &kt (2) Description of the Prior Art A microwave oven is a cooking appliance that cooks food by frictional heat generated by high frequency energy that causes the food molecules to move at a high speed, producing this way heat. Figure 1 is a perspective view separated in parts of a conventional microwave oven. As shown in Figure 1, the conventional microwave oven includes an internal box 12 with a cooking chamber 20, and an outer box 11 that forms the external appearance of the microwave oven. A door 30 is hinged on one side of the front of the microwave oven to open and close the cooking chamber 20, and a control board 31 is placed on the other side of the front of the oven microwave, and is used to select the cooking class and the cooking time.

^^ A compartment of electrical components 40 is separated from the cooking chamber 20 by a side wall, and includes a magnetron 41 which generates high frequency energy towards the cooking chamber 20, a high voltage transformer 5 which applies a high voltage through the magnetron 41, a fan 43 which directs the external air towards the compartment of the electrical components 40, for cooling the different electrical components, and a conduit j0 £ of guide 44 which directs the air flow, directed towards the compartment of the electrical components 40 by the fan 43, towards the cooking chamber 20. Figure 2 is a perspective view of a conventional fan motor housing. As illustrated in Figure 2, a motor box of fan 50 consists of a fan motor guard 51, wherein a fan motor 45 is installed, and a cylindrical fan guard f 52 protrudes into the compartment of the electrical components 40, and houses the fan 43. The fan motor guard 51 is of is a square shape, and is formed by upper and lower panels 54 and 55, and left and right panels 56 and 57. The left panel 56 is partially separated. The guard 51 of the fan motor has an interior with lattice support members 53 which serve to supporting the fan 43 and the fan motor 45. A circuit board (not shown) is installed on the top panel 54 of the fan motor housing 50, and a choke coil used to remove is formed on the circuit board. the noise contained in the power, a fuse 5 to prevent excessive voltage from being applied to the electrical components, and the like. The circuit board provides the rectified current to the electrical components placed inside the compartment of the electric components 40. The electric current to drive the fan motor 45, flows to the fan motor 45 by means of a wire 46, and a terminal housing 47 is provided at the end of the wire 46. This terminal housing 47 engages with an input terminal 48. provided to the fan motor 45. A slot 58 is machined on the left panel 56 of the case 50 of the jlp-motor of the fan, to allow the wire 46 to be stopped inside the fan motor case 50. The case of the 50 fan motor is secured to the inner surface of a rear wall 13 of the inner box 12 that separates the rear part of the compartment from the electrical components 40 from the outside. A plurality of safety members 59, formed in the housing 50 of the fan motor, are inserted respectively through the holes 13b that are form on the rear wall 13, and the case 50 of the fan motor is fastened to the rear panel 13 by screws * 1 14. When the box 50 of the fan motor is fixed to the rear wall 13 with the fan 43 and the fan motor 45, the external air is introduced into the compartment of the electrical components 40, by the rotation of the fan 43 through a plurality of air holes 13a machined on the rear wall 13 of the inner box 12, thereby cooling the JES; electrical components that emit heat. 10 This conventional fan motor box is partially cut apart, and when repairing the interior of the electrical component compartments, a hand or repairman's tool may touch the fan motor, thereby causing damage to the motor of the fan. fan. In order to prevent this damage, the repairer should take the trouble to separate the motor housing of the fan jp from the rear wall of the inner box before repairs, and then attach it to the same after repairs. SUMMARY OF THE INVENTION The present invention encompasses a fan motor housing for a microwave oven that can obviate the shortcomings and drawbacks of the conventional art. It is an object of the present invention to provide a fan motor case for a microwave oven < with an improved construction to provide protection from damage to a fan motor. In order to obtain the aforementioned objective of the present invention, a microwave oven having a compartment of electrical components, a ventilator installed in the compartment of the electrical components for directing the external air into the compartment of the unit is disclosed. the electric components for cooling the electrical components, and a fan motor that drives the fan, which includes a fan motor box secured to a rear wall of the microwave oven for housing the fan motor, and formed by upper panels, lower, left, and right, to have a square shape. The panels are joined to the back wall without gaps. BRIEF DESCRIPTION OF THE ATTACHED DRAWINGS - Figure 1 is a perspective view separated into parts of a microwave oven in accordance with a conventional technique. Figure 2 is a perspective view of a conventional fan motor housing. Figure 3 is a perspective view separated into parts of a microwave oven in accordance with the present invention. Figure 4 is a perspective view of a fan motor housing J ^ l for the microwave oven according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED MODALITIES A preferred embodiment of the present invention will be described in detail, with reference to the accompanying drawings. Figure 3 is a perspective view separated into parts of a microwave oven in accordance with the mf present invention. As illustrated in Figure 3, the microwave oven is comprised of an internal box 112 having a cooking chamber 120, and an external box lll. A door 130 is articulated on one side of the front of the microwave oven, for opening and closing the cooking chamber 120, 15 and a control board 131 is placed on the other side of the front of the microwave oven, and used to select rM ~ the cooking classes and the cooking time. A compartment of the electrical components 140 is separated from the cooking chamber 120 by a side wall 20, and includes a magnetron 141 which generates high frequency energy towards the cooking chamber 120, a high-voltage transformer 142 which applies high voltage to the magnetron 141, a fan 143 used to cool the different electrical components, and a guide conduit 144 that directs the air flow, directed into the compartment of the electrical components 140 by the fan 143, to the cooking chamber 120. That is, the external air is directed into the compartment of the electrical components 140 by the action of the fan 143, cooling of this 5 various electrical components that emit heat, and the heat-exchanged air is introduced to the cooking chamber 120 through the guide conduit 144, thereby removing the moisture and odor produced during cooking. Figure v 4 is a perspective view of a fan motor housing 150 for the microwave oven in accordance with the present invention. As shown in Figure 4, the box 150 of the fan motor, consists of a guard 151 of the fan motor, where a fan motor 145 is installed, and a cylindrical fan guard 152 protruding inside the fan compartment. the electrical components 140, and housing the fan 143. The guard 151 of the fan motor has a square shape, formed by upper and lower panels 154 and 155, and left and right panels 156 and 157. 0 The left panel 156 is partially separated . The guard 151 of the fan motor has an interior with lattice support members 153 which serve to support the fan 143 and the fan motor 145. A circuit board (not shown) is installed on the top panel 154 of the box 150 of the fan motor, and on the circuit board are formed a choke coil used to remove the noise contained in the power, a fuse to prevent excessive voltage from being applied to the electrical components, and the like. The circuit board provides the rectified current to the electrical components of the electrical component compartment 140. The current for driving the motor of the fan 145 flows to the motor of the fan 145 by means of a wire 146, and a terminal housing 147 is provided. at the end of the wire 146. This terminal housing 147 engages with an input terminal 148 provided in the fan motor 145. A slot 158 is made on the left panel 156 of the fan motor housing 150, to allow that the wire 146 be placed inside the box 150 of the fan motor. # The housing 150 of the fan motor is fixed to the inner surface of a rear wall 113 of the inner box 112 that separates the rear part of the electrical component compartment 140 from the outside. Panels upper, lower, left, and right 154, 155, 156, and 157, which form the fan motor guard 151 of the fan motor housing 150, adhere closely to the rear wall 113 without gaps. The fan motor 145 is surrounded by the upper, lower, left panels, and right 154, 155, 156, and 157, thus isolating itself from the i? outside of the box 150 of the fan motor. The following description relates to the method for securing the housing 150 of the fan motor to the rear wall 113. First a plurality of latch members 159 are inserted, each made on the upper and lower panels 154 and 155 of the box 150 of the fan motor, through the holes 113b machined on the rear wall J0 113, corresponding to the safety members 159. A plurality of screws 114 are inserted in the screw holes formed in the housing 150 of the fan motor and the rear wall 113, thereby holding the housing 150 of the fan motor to the rear wall 113. In the microwave oven with the above structure, once energy is applied to the microwave oven, the magnetron 141 produces the energy of high frequency directed to the cooking chamber 120 to start cooking. When the fan motor 145 is started, the fan 143 rotates, and the external air is directed into the compartment of the electrical components 140 by the rotation of the fan 143 through a plurality of air holes 113, thereby cooling the electric components . The thermopermuted air is continuously conducted to the cooking chamber 120, and then discharged to the outside again, thereby removing the moisture and odor produced during cooking. As described above, the fan motor housing for a microwave oven in accordance with the present invention is designed to be insulated from the outside, and keep foreign objects away from the fan motor when electrical components are repaired in the electrical component compartment, thus preventing damage to the fan motor. In accordance with ~ w above, there is no need to separate the motor housing from the 0 fan from the rear wall before repairs, or to attach it to the rear wall after repairs.

Claims (1)

NOVELTY OF THE INVENTION Having described the foregoing invention, it is considered as a novelty, and therefore, property is claimed as contained in the following: CLAIMS

1. A microwave oven having a compartment of electrical components, a fan installed in the compartment of electrical components to direct the external air into the compartment of electrical components, and to cool the electrical components, and a fan motor that drives the fan, this microwave oven comprising: a fan motor box secured to a rear wall of the microwave oven, for housing the fan motor, and formed by upper, lower, left, and right panels to have a square shape, the panels joining the rear wall without gaps.