WO2007071197A1

WO2007071197A1 - A cylindrical microwave oven

Info

Publication number: WO2007071197A1
Application number: PCT/CN2006/003533
Authority: WO
Inventors: Zhiming Wen; Tingba Li; Chuanming Shen
Original assignee: Tsann Kuen (China) Enterprises Co., Ltd.
Priority date: 2005-12-23
Filing date: 2006-12-22
Publication date: 2007-06-28
Also published as: CN2874310Y; US20090294441A1

Abstract

A cylindrical microwave oven comprises a shell (1). An oven cavity (2) and a microwave generator (3) radiating microwave into the cavity (2) are provided inside the shell (1). A door (6) for closing or opening the cavity (2) is mounted in the front of the shell (1). An upper disk cover (21), a U-shaped board (22) and a lower disk cover (23) form a cavity (2) with a front opening (101). The U-shaped board (22) is supported between the upper cover (21) and the lower cover (23). The door (6) is a circular arc board for closing or opening the front opening (101) of the cavity (2) .

Description

Cylindrical microwave oven

The invention relates to a microwave heating furnace. BACKGROUND OF THE INVENTION A conventional microwave oven has a furnace chamber and a microwave generator for radiating microwaves into the furnace chamber; a rotating tray is arranged in the furnace chamber; and a motor for rotating the rotating tray is arranged below the furnace chamber in the housing, and the rotating shaft Connecting the rotating tray in the cavity; the front of the housing is provided with a closed furnace chamber and can be opened; the plane of the furnace cavity is square or rectangular, and the radius of rotation of the rotating tray is the length of the narrowest side, so that the space of the four corners of the cavity Can not be used very well. The furnace doors are hinged to the front of the housing and, when opened, are turned over to the front of the housing and to the side of the housing, requiring external space. Summary of the invention

The present invention is directed to a cylindrical microwave oven having a high utilization rate of a furnace chamber and a reduced space. One technical solution of the present invention is: a cylindrical microwave oven having a furnace chamber and a microwave generator for radiating microwaves into the furnace chamber; a furnace door having a closed furnace chamber and being openable is provided at the front of the casing. The furnace chamber is composed of a disc-shaped upper cover, a U-shaped plate and a disc-shaped lower cover to form an open cylindrical cavity at the front, and the U-shaped plate is supported between the upper cover and the lower cover; the furnace door is a closed furnace An arc plate with an open front and a front opening.

The furnace door is divided into two fans that are separated by a circular slideway, and a door opening mechanism for interlocking the opening and closing of the two furnace doors is installed on the casing. The two furnace doors slide on the circular slide, and the opening and closing do not occupy the external space. When opened, it can expose half of the internal space of the furnace cavity, which is smaller than the operation of the single door structure and has more space inside the furnace cavity for easy access to the heating object. The door opening mechanism makes the opening operation of the two furnace doors simpler and more convenient.

The door opening mechanism comprises two long connecting rods, two short connecting rods and a guiding plate; two long connecting rods are used

V-shaped hinge, the hinge shaft is hinged on one end side of the guide plate; the free ends of the two long links are respectively fixed on the inner lower part of the same door on the same side of the two furnace doors; two short links are made for V The hinged shaft is slidably coupled to the other end side of the guide plate; the free ends of the two short links are respectively hinged at the waist of the long link on the same side of the two long links; the guide plate is fixedly mounted On the housing. This mechanism can ensure that the two furnace doors are opened and closed synchronously, and the degree of sealing is good when closed.

Confirmation Two furnace doors are connected to each other with a hook connection mechanism. Preferably, a pair of hook connecting mechanisms are provided on the upper side and the lower side of the butt sides of the two furnace doors. After the two furnace doors are closed, the hook connecting mechanism prevents them from opening at random, preventing microwave leakage and ensuring safety.

A mounting structure is in the form of a microwave generator mounted above the upper cover and a motor mounted below the lower cover.

A circular upper slideway for sliding and limiting the furnace door is arranged above the furnace chamber, and a bottom plate supporting the furnace cavity is arranged below the furnace cavity, and the bottom plate has sliding and limiting the furnace door A circular glide path; the motor is mounted on the base plate. The furnace door slides between the upper chute and the glide path and is limited to facilitate sealing.

The upper edge of the oven door is provided with an upper pulley that abuts the upper slide. The lower edge of the furnace door is provided with a lower pulley that abuts against the lower slide. The opening and closing resistance is small. The cylindrical microwave oven of the invention has a cylindrical cavity, and the rotating radius of the rotating tray is a cylindrical diameter, which increases the effective space in the furnace cavity, so that the full use of the space is beneficial to the reflection distribution of the microwave, and the heating of the heating object by the microwave is saved. Time has improved work efficiency. The split-arc sliding door is used, and after the door is opened, the two furnace doors slide on the circular slideway and are simultaneously opened, which saves the external space required for the hinged door opening. After the microwave oven is opened, half of the furnace cavity is exposed, which facilitates the pick-and-place of the microwave heating vessel and has the convenience of easily cleaning the inside of the furnace chamber. The door opening mechanism adopts two V-shaped interconnected four-link structures with opposite openings, which can make the two furnace doors face at the same time with the same degree, and the sealing effect is good when closed. Two furnace doors are connected to each other to provide a hook connection mechanism, so that the two furnace doors are closed, so that they are not opened at will, preventing microwave leakage and ensuring safety. The upper edge of the furnace door is provided with a pulley top against the upper slideway, and the lower edge of the furnace door is provided with a lower pulley top against the glideslope, which can reduce the opening and closing resistance and ensure the clearance between the two furnace doors and the microwave oven casing. It is easy to prevent microwave leakage. Automatic door opening and closing can be achieved with the addition of a motor and a simple transmission. From the above, it can be seen that the present invention fully considers the interests of consumers from the perspective of the consumer. Another technical solution of the present invention provides a cylindrical microwave oven, wherein the door opening mechanism can automatically open or close two furnace doors in conjunction with each other.

The above proposes a door opening mechanism for a cylindrical microwave oven which can be switched between manual operation or automatic operation to open or close two furnace doors of a cylindrical microwave oven. The specific technical solution of the present invention is: a door opening mechanism of a cylindrical microwave oven, in which two furnace doors that are opened along a circular slideway can openly close the open portion of the front of the cylindrical furnace cavity, at the two furnace doors The rotating center is provided with a rotating shaft V-shaped hinged two connecting rods; the free ends of the two connecting rods are respectively fixed on the same side furnace door; two concentric circles on the rotating center are provided with two upper and lower staggered and can be fan-shaped a circular arc-shaped rack, wherein the ends of the two racks for fan-shaped expansion are respectively connected to one of the connecting rods; and a gear is arranged on each side of the symmetrical line of the two racks for fan-shaped development, The two gears mesh with each other and respectively mesh with a rack, one of which is coupled to the motor. The motor drives the meshed rack to fan-fold or gather relative to the symmetry line through the gear, and the connecting rod connected to the end of the rack-shaped fan-shaped strip drives the connected furnace door to open along the circular slide. Or moving in the direction of closing; the gear simultaneously drives the other gear to rotate in the opposite direction, and the other gear drives the meshed rack to expand or close in opposite directions with respect to the symmetrical line; the rack is fan-shaped. The connecting rod connected to the end drives the connected furnace door to move in the direction of opening or closing along the circular slide; thereby realizing the two furnace doors to automatically open or close along the circular slide at the same time.

The switchable manual operation or automatic operation of the present invention to open or close two furnace doors of a cylindrical microwave oven is achieved by the following technical measures: a driving gear is mounted on the motor shaft; and the rotating shafts of the two gears are mounted on a translation assembly; the drive gear meshes with the first gear when the translation assembly is in the first position; the drive gear disengages from the first gear when the translation assembly is translated to the second position . A preferred translating assembly structure is: the translating assembly is a u-shaped piece mounted on the toothed side of the two racks, and the two flat plate portions of the U-shaped piece are respectively provided with two shaft holes correspondingly mounted a rotating shaft of two gears; when the u-shaped piece is in the first position, the two gears respectively mesh with the corresponding rack and the driving gear meshes with the first gear; the u-shaped piece translates away from the two racks In the second position on one side of the tooth, the two gears are respectively disengaged from the corresponding rack and the drive gear is disengaged from the first gear.

In a preferred embodiment: the u-shaped ferrule is mounted on a guiding box on the microwave oven housing; the two flat portions of the u-shaped sheet are each provided with a long guiding hole, and the guiding box is Each of the upper and lower surfaces has a rib protruding in a corresponding long guide hole of the u-shaped piece; the guide box is provided with two arc-shaped guide grooves which are respectively shifted up and down to accommodate the two racks, Two gears are respectively mounted in the rack guiding box, wherein the first gear has a coaxial pinion; when the U-shaped piece is in the first position, the ridges on the upper and lower surfaces of the guiding box are located correspondingly long in the U-shaped piece One end of the hole, two gears and corresponding teeth The strips are engaged and the driving gears of the motor mesh with the pinion gears of the first gear; when the u-shaped sheets are translated to the second position, the ridges on the upper and lower surfaces of the guiding box are located at the other end of the corresponding long guiding holes of the U-shaped piece, two The gears are disengaged from the respective racks and the drive gears of the motor are disengaged from the pinions of the first gear.

Further, the cam is used to realize the switching of the u-shaped piece from the first position to the second position, that is, from automatic to manual: the upper and lower surfaces of the guiding box each have an edge away from the toothed side of the two racks. An outwardly extending lug having a shaft hole in each of the two lugs; a cam disposed between the two lugs, the cam shaft passing through the shaft holes of the two lugs; the U-shaped sheet opening two The flat plate portions are respectively provided with the retaining holes of the cam shaft; when the highest point of the cam is offset from the groove bottom of the U-shaped piece, the U-shaped piece is in the first position; when the last point of the cam is against the groove bottom of the ϋ-shaped piece, υ The sheet is in the second position; a tension spring connection guide box is attached to each end of the bottom of the slat groove.

A radially extending switching rod is coupled to the rotating shaft of the cam, and the end of the free end of the switching rod extends beyond the housing of the microwave oven. Switching from automatic to manual or manual to automatic switching is facilitated by pulling the end of the free end of the shift lever.

Preferably, the guiding box is divided into upper and lower portions, and a blocking piece is arranged between the curved guiding groove of the upper guiding box and the curved guiding groove of the lower guiding box. It can prevent interference when the racks move with each other.

In order to correctly stop the movement of the two furnace doors: the microwave oven housing is provided with a door opening limit switch and a door closing limit switch; the door opening limit switch is one of the two connecting rods when the furnace door is fully opened When the root link touches, the door closing limit switch touches the connecting rod when the furnace door is completely closed; the door opening limit switch and the door closing limit switch and the electric motor are respectively electrically connected to the control circuit board.

In a preferred embodiment, the driving components of the two furnace doors are disposed under the furnace cavity: the V-shaped hinged shaft of the two connecting rods is the rotating shaft of the microwave oven turntable; the free ends of the two connecting rods are respectively fixed at the same On the lower edge of the side furnace door.

In particular, two driven door assemblies are arranged above the furnace chamber: the upper edges of the two furnace doors are respectively fixed with the free ends of two other V-shaped hinged links, and the two links are V-shaped hinged shafts. The center of rotation of the two furnace doors is located above the furnace chamber. The opening and closing movement of the two furnace doors can be made more stable. The door opening mechanism of the cylindrical microwave oven of the invention drives the two gears to rotate in the opposite direction at the same time, and each of the racks and the connected connecting rods and the furnace door are driven to open or close, so that the two furnace doors are automatically opened in conjunction with each other. And close the door. The structure of the door opening mechanism does not have a sports blind spot, the operation is stable, the commutation is convenient, and suitable Combined with the flexible working characteristics of the motor, it is also easy to switch manual operation or automatic operation. a drive gear is mounted on the motor shaft; and the rotating shafts of the two gears are mounted on a translation assembly; the translation of the two gears is used to control whether the drive gear is in transmission relationship with the two racks to complete manual operation or Automatic operation switching, while maintaining the position of the two racks and the motor is stable, the overall structure strength is high, and the reliability is good. The translating assembly is in the form of a u-shaped piece, which is easy to manufacture and easy to obtain high strength by selecting a metal material. The u-shaped piece is combined with a guiding box mounted on the microwave oven casing; the guiding box accommodates two racks and two gears, and the driving gear of the electric motor is meshed with the coaxial pinion gear of one of the two gears, so that The mounting structure of the motor and the guide box are separated from each other for assembly and maintenance. The cam is used to switch from automatic to manual, which can conveniently realize the automatic door opening and the mechanical door opening when cleaning. The structure is simple and the operability is good. The guide box is divided into upper and lower parts, and a flap is provided. It can prevent the interference when the racks move with each other, and it is convenient to manufacture the guide box and assemble two racks and two gears. The door opening limit switch and the door closing limit switch are respectively electrically connected to the control circuit board, and one of the two connecting rods touches the door opening limit switch or the door closing limit switch to control the motor to stop rotating. The high degree of automation of the operation makes the microwave oven smooth and smooth when the door is opened. When the door is closed, the resistance object will automatically turn to the door opening state, which acts as an anti-pinch. The drive components of the two furnace doors are located below the furnace chamber to facilitate the placement of microwave devices above the furnace chamber. The driven components of the two furnace doors are arranged above the furnace chamber to make the opening and closing movement of the two furnace doors more stable. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the structure of a casing of an embodiment of a cylindrical microwave oven according to the present invention. FIG. 2 is a schematic perspective view of the embodiment of FIG. 1 after the housing is removed. FIG. Fig. 3 is a schematic view showing the unfolded structure of the door portion of the embodiment of Fig. 1. Fig. 4 is a perspective view showing the structure of a main portion of a door mechanism of a cylindrical microwave oven of the present invention.

Fig. 5 is a schematic view showing the unfolded structure of the main body portion of the embodiment 2 of Fig. 4 rotated horizontally by 180°. Fig. 6 is a schematic view showing the unfolded structure of the main body portion of the embodiment 2 of Fig. 4 with the two connecting rod portions removed and flipped by 180°. Fig. 7 is a perspective view showing the three-dimensional structure in which the main body portion of the embodiment 2 of Fig. 4 is removed and the two links are laterally rotated by 180°.

Fig. 8 is a perspective view showing the arrangement of the cylindrical microwave oven in which the embodiment of Fig. 4 is mounted to remove the open state of the outer casing door.

Figure 9 is a schematic cross-sectional view showing the portion of the embodiment of Figure 4 mounted in a cylindrical microwave oven housing. Fig. 10 is a perspective view showing the configuration of the cylindrical microwave oven in which the embodiment of Fig. 4 is mounted to remove the closed state of the outer casing door.

Figure 11 is a perspective view showing the unfolded structure of the driven member portions of the two furnace doors above the furnace chamber in which the cylindrical microwave oven of Embodiment 2 of Figure 4 is mounted. detailed description

Example 1: The structure of an embodiment of the cylindrical microwave oven of the present invention is shown in Fig. 1. A cylindrical furnace chamber 2 is provided in the cylindrical casing 1 having a window at the waist of the cylindrical microwave oven. Above the furnace chamber 2 in the casing 1, there is provided a microwave generator 3 for radiating microwaves into the furnace chamber 2. A rotary tray 4 is provided in the furnace chamber 2. Below the furnace chamber 2 in the casing 1, an electric motor 5 for rotating the rotary tray 4 is provided, and the rotating shaft of the rotary tray 4 in the furnace chamber 2 is connected to the motor 5 through the bottom surface of the furnace chamber 2. The front window of the casing 1 is provided with an arc-shaped furnace door 6 which closes the furnace chamber 2 and can be opened.

The casing 1 is a cylindrical barrel having a window 101 at the waist and an open bottom. An upper slide 11 for sliding and limiting the furnace door 6 is installed in the casing 1 above the window 101. A bottom plate 12 is mounted at the bottom of the casing 1. The inner bottom surface of the bottom plate 12 is provided with a circular slide 121 having a sliding and limiting action on the furnace door 6 along the periphery.

Referring to FIG. 2, the furnace chamber 2 is composed of a disc-shaped upper cover 21, a U-shaped plate 22 and a disc-shaped lower cover 23, and the U-shaped plate 22 is supported between the upper cover 21 and the lower cover 23. A cylindrical cavity that is open at the front. The side wall of the upper cover 21 is upward, and the side wall of the lower cover 23 is downward. The microwave generator 3 is mounted in the side wall above the upper cover 21. The motor 5 is mounted in a side wall below the lower cover 23, and a pinion 51 is disposed on the rotating shaft of the motor 5, and the pinion 51 meshes with a large gear 42 to form a deceleration relationship; the rotating shaft 1 of the large gear 42 passes through the middle of the lower cover 23 The shaft of the shaft hole 231 rotates the rotating shaft of the tray 4.

The furnace door 6 that closes the open front portion of the furnace chamber 2 and can be opened is divided into two fans, each of which is a piece The circular arc plate; when the two furnace doors 6 are opened, half of the inner space of the furnace chamber 2 can be exposed to facilitate access to the heating object. Referring to FIG. 3, an arc-shaped right angle platen 611 is mounted on the upper side of a furnace door 61 on the left side, and an upwardly extending pin 612 is mounted on each of the upper ends of the platen 611. An upper pulley 613 that abuts against the inner side wall of the upper slide 11 is mounted on each of the pins 612. An arc-shaped right angle platen 621 is mounted on the upper side of a furnace door 62 on the right side, and an upwardly extending pin 622 is mounted on each of the upper ends of the platen 621. An upper pulley 623 that abuts against the inner side wall of the upper slide 11 is mounted on each of the pins 622. A clamping plate 614 is mounted on the upper side of the upper side of a furnace door 61 on the left side, and a small vertical shaft 615 is mounted on the clamping plate 614. A clamping plate 624 is mounted on the upper side of the upper side of the furnace door 62 on the right side. A small vertical shaft 625 is mounted on the clamping plate 624, and a hook 626 is mounted on the small vertical shaft 625. A clamping plate 617 is mounted on the lower side of the lower side of a furnace door 61 on the left side. A small vertical shaft 618 is mounted on the clamping plate 617, and a hook 619 is mounted on the small vertical shaft 618. A lower side of the furnace door 62 on the right side is mounted with a clamping plate 627 on the left end, and a small vertical shaft 628 is mounted on the clamping plate 627. After the two furnace doors 61, 62 are closed, the hook 626 on the upper side of the furnace door 62 on the right side is stuck on the small vertical shaft 615 on the left side of the left door 61; the lower side of the left side of the furnace door 61 The hook 619 is stuck on the small vertical shaft 628 on the lower side of the furnace door 62 on the right side; the two furnace doors 61 and 62 are not opened arbitrarily to prevent microwave leakage and ensure safety. When a large external force is applied, the upper side hook 626 is disengaged from the small vertical shaft 615, and the lower side hook 619 is disengaged from the small vertical shaft 628; the two furnace doors 61, 62 are opened. A curved right angle platen 71 is mounted on the lower side of a furnace door 61 on the left side, and a lower pulley 713 which is horizontally rolled against the glide path 121 is mounted below each of the lower ends of the lower plane 712 of the platen 71. A curved right angle platen 72 is mounted on the lower side of a furnace door 62 on the right side, and a lower pulley 723 which is horizontally rolled against the glide path 121 is mounted below each of the lower ends of the lower plane 722 of the platen 72. The two furnace doors 61, 62 slide between the upper chute 11 and the glide path 121, and the opening and closing do not occupy the external space, and the opening and closing resistance is small and the sealing is favorable.

A door opening mechanism 7 for interlocking opening and closing of the two furnace doors 61, 62 is attached to the bottom plate 12 supporting the furnace chamber 2 from below. The door opening mechanism 7 comprises two long connecting rods, two short connecting rods and one guiding plate; a right angle pressing plate 71 mounted on the lower side of the left side of the furnace door 61 has a long connecting rod 714 extending in the middle of the lower plane 712. a right angled platen 72 is mounted on the lower side of the right side of the furnace door 62, and a long connecting rod 724 is protruded inwardly from the lower plane 722. The top ends of the two long connecting rods 714 and 724 are hinged in a V shape, and the hinged shaft is hinged. In the shaft hole 772 on the rear end side of the guide plate 77. The two short links 73, 74 are V-shaped hinged, and the lower end of the hinge shaft 79 is slidably coupled to the guide groove 771 on the front end side of the guide plate 77; the free end of the short link 73 is hinged to the long link by the screw pin 75. At the waist of the 714, the free end of the short link 74 is hinged to the waist of the long link 724 by a threaded pin 76. The guide plate 77 is fixedly mounted on an arcuate guide 78 corresponding thereto. The upper plane of the arcuate guide plate 78 is provided with a guide groove 781 corresponding to the guide groove 771 on the front end side of the guide plate 77, and a shaft hole 782 corresponding to the shaft hole 772 on the rear end side of the guide plate 77. The upper ends of the two short links 73, 74, which are V-shaped hinged hinges 79, are slidably coupled to the guide grooves 781 on the front end side of the guide plates 78; the two long links 714, 724 are hinged at the upper ends of the hinged shafts of the V-shaped hinges. 78 is in the shaft hole 782 on the rear end side. The front and rear ends of the guide plate 77 are respectively provided with a boring head, and the card is fixed in the boring holes 783 and 784 on the front and rear sides of the arcuate guide plate 78. The flat leg 785 on the front side of the guide plate 78 is fixed in the leg 123 on the front side of the bottom plate 12, and the flat leg 786 on the rear side of the guide plate 78 is fixed in the leg 124 on the rear side of the bottom plate 12. A groove 125 corresponding to the guide groove 771 of the guide plate 77 is formed between the leg 123 on the front side of the bottom plate 12 and the leg 124 on the rear side of the bottom plate 12 to prevent the two long links 714 and 724 from being V-shaped. The lower end of the hinge shaft touches the bottom plate 12. This mechanism can ensure that the two furnace doors 61, 62 are synchronized and open to the same extent, and the sealing effect is good when closed.

The outer shape of the furnace chamber 2, the microwave generator 3, the upper slide 11, the bottom plate 12 and the two circular arc-shaped furnace doors 61, 62 of this embodiment are shown in Fig. 2. After the two furnace doors 61, 62 are subjected to an outwardly extending external force, the hooks 626 on the upper side thereof are separated from the small vertical shaft 615, and the hooks 619 on the lower side are separated from the small vertical shaft 628; the two furnace doors 61, 62 are opened. The upper pulley 613 mounted on the upper side of the oven door 61 rolls along the inner side wall of the upper slide 11; the upper side of the slide 11 of the upper pulley 623 mounted on the upper side of the oven door 62 rolls in the opposite direction. The lower pulley 713 installed on the lower side of the furnace door 61 is rolled against the glide path 121, and the lower pulley 723 mounted on the lower side of the furnace door 62 is rolled against the glide path 121 in the opposite direction; the two furnace doors 61, 62 are on the upper chute 11 Slidingly open with the glide path 121, and the two long links 714, 724 are V-shaped open relative to the hinge axis of the self, and the two short links 73, 74 are v-shaped open relative to the hinge shaft 79 of the self. . The lower ends of the hinge shafts 79 of the two short links 73, 74 are slid rearward in the guide grooves 771 on the front end side of the guide plates 77; the upper ends of the hinge shafts 79 of the two short links 73, 74 are in the guide grooves 781 of the guide plates 78. Sliding backwards, the two furnace doors 61, 62 are simultaneously turned rearward, and the degree is the same. After the two furnace doors 61 and 62 are fully opened, the food can be picked up and discharged.

After the two furnace doors 61, 62 are subjected to an external force that is gathered inward, the upper pulley 613 mounted on the upper side of the furnace door 61 rolls along the inner side wall of the upper slide 11; the upper pulley 623 mounted on the upper side of the furnace door 62 slides The inner side wall of the track 11 rolls in the opposite direction. The lower pulley 713 of the lower side of the furnace door 61 is rolled against the glide path 121, and the lower pulley 723 mounted on the lower side of the furnace door 62 is rolled against the glide path 121 in the opposite direction; the two furnace doors 61, 62 are on the upper side. The slide rail 11 and the glide path 121 are slidably closed, and the two long links 714, 724 are V-shaped closed with respect to the hinge shaft of the self, and the two short links 73, 74 are driven to be V-shaped with respect to the hinge shaft 79 of the self. closure. The lower ends of the hinge shafts 79 of the two short links 73, 74 slide forward in the guide grooves 771 on the front end side of the guide plates 77; the upper ends of the hinge shafts 79 of the two short links 73, 74 are in the guide grooves 781 of the guide plates 78. Sliding forward, the two furnace doors 61, 62 are simultaneously closed forward, and the degree is the same. The hooks 626 on the upper sides of the last two furnace doors 61, 62 catch the small vertical shaft 615, and the hooks 619 on the lower side catch the small vertical shaft 628; the two furnace doors 61, 62 are closed to heat the food.

Of course, one of the two long links 714, 724 can be connected to a curved rack, and the other motor can drive the curved rack through the transmission gear, so that the long link swings relative to its own hinge axis. Further, under the combined action of the two short links 73, 74 and their hinge shaft 79 and the guide groove 771 of the guide plate 77 and the guide groove 781 of the guide plate 78, the other long link is driven to swing oppositely with respect to its own hinge axis. , to achieve automatic door opening and closing. Or, by using another motor, the hinge shaft 79 of the two short links 73, 74 is moved along the guide groove 771 of the guide plate 77 and the guide groove 781 of the guide plate 78 through the transmission mechanism, and the two short links 73, 74 are V-shaped closed. Or open, push the two long links 714, 724 to V-shaped closed or open relative to their own hinge axis, to achieve automatic closing or opening.

Alternatively, the microwave generator 3 may be disposed below the furnace chamber 2 to introduce microwaves from the side into the furnace chamber 2; and the door opening mechanism 7 is disposed above the furnace chamber 2. Example 2: A cylindrical microwave oven housing has two split furnace doors which openably close the open front of the cylindrical furnace chamber along a circular slide. The door opening mechanism of the cylindrical microwave oven of the invention is installed in the cylindrical microwave oven casing, and the two furnace doors are moved along the circular slideway in the direction of snoring or closing, so that the two furnace doors are automatically opened simultaneously along the circular slideway. Or close.

The structure of the main part of the door opening mechanism is shown in Figure 4, which will be described in detail below.

Please refer to Figure 5 first. The components of the main part of the door opening mechanism are: left rack Γ, right rack 2 ′, left link 5 ′, right link 6 , left gear 7 , right gear 8 ′, drive Gear 9, motor 10, flap 14, upper guide box 15', lower guide box 16, cam 17, camshaft 18', U-shaped piece 19', two gear shafts 20, two turns Type buckle 21, two tension springs 23,.

The left rack Γ is a circular arc-shaped rack, and the left end 10 Γ is provided with a screw hole for coupling the left link 5; The right end 102 is a toothless flat head, and the inner circular surface between the left end 101' and the right end 102' is a tooth surface 103'. The right rack 2 is a circular arc-shaped rack, and the right end 20 Γ is provided with a screw hole for coupling the right link 6 ′; the left end 202 ′ is a toothless flat head, and the left end 202 ′ and the right end 201 ′′ The inner circular surface is the tooth surface 203'; the outer end 201 has an outwardly convex lug 204'.

The arc length and the radius of curvature of the left rack Γ and the right rack 2' are equal, and the tooth shape and the number of teeth are the same.

The left end of the left link 5 is provided with a shaft hole 501', the left end is provided with a furnace door connecting portion 502', and a rack connecting portion 503' is provided near the left end.

The left end of the right link 6' is provided with a shaft hole 601', the right end is provided with a furnace door connecting portion 602', and a rack connecting portion 603' is provided near the right end.

The left link 5' is symmetrical with the right link 6', their lengths are equal, and the distance from the shaft hole to the rack connection is equal.

The right gear 8' is composed of a combination of a large gear 801' and a pinion 803' coaxially coaxially, wherein the large gear 801 has the same radius as the left gear 7, and the tooth shape and the number of teeth are the same.

Each of the four corners of the upper guiding box 15' has a screw hole 1500'; a central portion of the upper surface has a groove 150 向 extending rearward; and a front portion of the groove 150 左 has a long hole 1502 symmetrically left and right, with A rib 1503'. A lug 1504' extends rearwardly from the middle of the rear side edge of the upper surface of the upper guide box 15'. The lug 1504 has a shaft hole 1505'. Referring to FIG. 6, the upper guide box 15 has an arcuate guide groove 1506' on the front surface of the lower table, and the rear side wall of the guide groove 1506' communicates with an "8"-shaped groove 1507' and three bayonet ports 1508. The upper portion of the front side wall of the guide groove 1506 communicates with the two card slots 1509.

Each of the four corners of the lower guide box 16' has a screw hole 1600'; the front right portion has a lug 1620', and the lug 1620' extends downwardly from the lower surface of the guide box 16' to form a boss. The lower surface of the lower guide box 16' has a large circular groove 161Γ on the right side; a rib 1613' on the left side; and a groove 1601 extending rearward in the middle. The front portion of the recess 160 Γ has a long hole 1602 symmetrically left and right, with a rib 1603' in the middle and a boss 1612' in the middle left. A lug 1604 extends rearwardly from the middle of the rear side edge of the lower surface of the lower guide box 16', and has a shaft hole 1605 on the lug 1604'. The front side of the lower guide box 16 is provided with a screw hole 1614' at a position corresponding to the rib 1613, and a screw hole 1615 is formed at a position opposite to the left side of the lug 1620. Referring to FIG. 5, the lower front surface of the lower guide case 16' has an arcuate guide groove 1606, and the rear side wall of the guide groove 1606 communicates with a groove 1607; the bottom of the groove 1607' has an oblong shape. The small groove 1608', the front side wall of the groove 1608' has a window 1609' communicating with the large circular groove 1611 of the lower surface. Under the guide To the rear of the upper surface of the casing 16, a short column 1610 is provided on each side of the lug 1604'.

The two flat portions of the U-shaped piece 19 are opened forward. The upper flat plate portion 1901 is provided with a long guiding hole 1903 along the middle symmetry line, and one gear shaft hole 1902 is disposed on each side of the front side of the long guiding hole 1903'; and an oblong cam shaft is arranged behind the long guiding hole 1903'. The yield hole 1904'. The groove bottom 1905 of the U-shaped piece 19', the central portion is pressed forward by a concave rib 1906', and a small hole 1907' is formed at each end of the groove bottom 1905'. The lower flat portion 1910 of the U-shaped piece 19' is provided with an "L"-shaped notch 1913' along the middle symmetry line, a notch 1913, and a gear shaft hole 1912 on each side of the front portion; a notch 1913, a rear portion A yielding hole 1914' of the oblong cam shaft.

Referring to Figure 6, the upper surface of the upper guide box 15' is lowered. The tooth surface 103 of the left rack 1, backward, the right end 102' is placed in the arcuate guide groove 1506' of the upper guide box 15'. The left gear 7' is placed on the deeper portion to the left of the groove 1507'; the right gear 8' is placed on the shallower portion of the right side of the groove 150T, on the lower half of the lower gear 801' and the left gear 7' The half is engaged. The blocking piece 14' is placed on the guiding groove 1506' of the upper guiding box 15, and the two chucks 1401' at the front end of the blocking piece 14' are engaged in the two card slots 1509' of the front side wall of the guiding groove 1506', the blocking piece The three claws 1402 at the rear end of the 14' are engaged with the guide groove 1506, and the three bayonet ports 1508 of the rear side wall are fixed to the upper guide box 15, on the upper side. The tooth surface 203 of the right rack 2' is rearward, and the left end 202' is placed on the flaps 1, 4. The upper surface of the lower guide case 16, is fastened downwardly on the upper guide case 15. The left end 202 of the right rack 2 enters the curved guide groove 1606' of the lower guide box 16'; the large gear 801' of the right gear 8' enters the groove 1607' on the rear side of the guide groove 1606', the pinion gear 803' enters the small groove 1608' at the bottom of the recess 1607'. Use four screws to pass through the screw holes 1500' at the four corners of the upper guide box 15' and the screw holes 1600' at the four corners of the lower guide box 16', and then use the four nuts to lock the four screws to guide the upper guide box 15' and the lower side. The boxes 16' are interlocked to each other to form an approximately rectangular guide box. A cam 17 is placed between the lug 1504' of the upper guide case 15, and the lug 1604' of the lower guide case 16, . The two flat portions of the U-shaped piece 19 are inserted into the guide box, and the upper flat plate portion 1901' falls on the upper guide case 15, in the groove 1501' of the upper surface, and the long guide hole 1903' of the upper flat plate portion 1901' is caught. The ridges 1503' of the upper guide box 15'; the lower flat portion 1910' of the U-shaped sheet 19' falls in the recess 1601' of the lower surface of the lower guide box 16', and the notch 1913' of the lower flat portion 1910' catches the lower guide The ribs 1603 of the box 16', and the boss 1612'. Two gear shafts 20 are respectively inserted into the two gear shaft holes 1902' of the flat plate portion 1901' of the U-shaped piece 19', and the two gear shafts 20' pass through the two long holes 1502 of the upper guide box 15, The central hole 802' passing through the left gear 7, and the center hole 802' of the right gear 8, passes through the two long holes 1602 of the lower guide case 16', and the lower ends of the two gear shafts 20' are respectively U-shaped. The sheet 19, the two gear shaft holes 1912 of the lower flat portion 1910', projects in the middle. Use two E-shaped buckles 21, card The lower end of the two gear shafts 20' are accommodated, so that the two gear shafts 20' together with the left gear 7, and the right gear 8, are connected to the U-shaped piece 19 as a whole, and the large gear 801' of the right gear 8' is left. The gear 7 remains engaged at all times. The upper portion of the cam shaft 18 passes through the cam shaft retaining hole 1914' of the lower plate portion 1910' of the U-shaped piece 19', passes through the shaft hole 1605' of the rear guide box 16' rear lug 1604', and the shaft of the cam 17' The hole 1701, the shaft hole 1505' of the upper guide ring 15' rear side lug 1504', exposes the end from the retaining hole 1904' of the flat plate portion 1901' of the U-shaped piece 19'. The pin 17' is driven into the pin 17' and the pin hole in the upper portion of the cam shaft 18' to fix the cam 17' to the upper portion of the cam shaft 18'. Two tension springs 23' are respectively mounted on the small holes 1907' and the lower guide box 16, the rear lug 1604, and the short columns 1610 on both sides of the U-shaped piece 19' groove bottom 1905'. The three-dimensional structure of each part of the guide box part is assembled, as shown in Fig. 7.

A drive gear 9 is mounted on the rotating shaft 1002 of the motor 10. The drive gear 9' is dropped into the large circular recess 1611' of the lower guide box 16', and a corner of the drive gear 9' is extended into the small recess 1608' across the window 1609'. The two lugs 100' of the motor 10' are respectively dropped on the lower surfaces of the lugs 1620' and the bosses 1612' of the lower guide case 16'. The lower surfaces of the lugs 1620' and the bosses 1612' have a positioning pin and a screw. The holes correspond to the positioning holes and the screw holes on the two lugs 1001', and the two lugs 100Γ are fixed to the lower surface of the lug 1620' and the boss 1612 by two screws. The motor 10' is mounted on the guide box. With the left link 5' and the right link 6, the three-dimensional structure of the main part of the door opening mechanism is shown in Fig. 4.

At this time, the highest point 1702' of the cam 17' is offset from the groove bottom 1905' of the U-shaped piece 19'. Under the action of the tension of the two tension springs 23', the U-shaped piece 19' is pulled forward; the upper and lower surfaces of the guiding box The ribs 1503, 1603 are located at the rear ends of the corresponding long guiding holes 1903', 1913' of the U-shaped piece 19', the left gear 7' is meshed with the left rack 1', and the right gear 8' and the right rack 2 are In engagement, the drive gear 9' of the motor 10' meshes with the pinion 803 of the right gear 8'. The left and right racks 2' are driven by the motor 10', and the door to which the left link 5' and the right link 6' are connected is in an automatic control state.

Rotating the camshaft 18' causes the cam 17' to push the shackle 19' of the groove bottom 1905', and the two tension springs 23' are stretched; until the highest point 1702 of the cam 17', the apex is at the U-shaped piece 19' On the concave edge 1906' of the groove bottom 1905', the convex strips 1503', 1603' of the upper and lower surfaces of the guiding box are located on the U-shaped piece 19, the front ends of the corresponding long guiding holes 1903, 1913, the left gear 7, and the left tooth The strip is disengaged, the right gear 8 is disengaged from the right rack 2', and the drive gear 9 of the motor 10' is disengaged from the pinion 803' of the right gear 8'. The motor 10' can no longer drive the left and right racks 2, the left link 5, and the door connected to the right link 6, which is in manual control.

As mentioned above, the lower guide lug 1620' of the lower guide box 16' has a screw hole 1614' and a left side rib 1613. There is a screw hole 1615; the main body portion of the door opening mechanism can be attached to the housing of the microwave oven by the two screw holes.

The cylindrical microwave oven of the present embodiment is installed. The structure in which the furnace door is opened after the outer casing is removed is shown in FIG. 8. The microwave oven casing has a disc-shaped upper cover 40', a U-shaped plate 90, and a circle. The disc-shaped lower cover 60' constitutes a furnace chamber, and the U-shaped plate 90' is supported between the upper cover 40' and the lower cover 60 to form a cylindrical cavity that is open at the front. The left left door 3, the right door 4, the upper cover 40, and the lower cover 60 are disposed, and the outer circular guides are disposed on both sides of the open portion in front of the furnace chamber. Referring to Figure 9, the lower shaft 60' of the lower end of the tray 70' is pivoted through the shaft hole 501' at the right end of the left link 5' and the shaft hole 601 at the left end of the right link 6'. The door joint 502' of the left end of the left link 5' is fixed to the lower edge of the left door 3'. The rack connecting portion 503 of the left link 5' is fixedly coupled to the left end 101 of the left rack Γ. The right link 6, the right end door connection 602' is fixed to the lower edge of the right door 4'. The rack connecting portion 603' of the right link 6' is fixedly coupled to the right end 201' of the right rack 2'. Therefore, the two connecting rods 5', 6' are V-shapedly hinged to the tray 70 on the center of the two furnace doors 3', 4', and the rotating shaft 7Γ; two circular-shaped racks Γ, 2, up and down Staggered on a concentric circle of the above-mentioned center of rotation for fan-shaped expansion.

A bracket 51' is disposed between the chassis 50' and the lower cover 60'. The door opening limit switch 12', the door closing limit switch 13' and the control circuit board 1' are set on the bracket 51'; the door opening limit switch 12' and the door closing limit switch 13' and the motor 10' are electrically connected to the control circuit board 1'' respectively. The details of this section are well known in the art and will not be described here.

As shown in FIG. 8, when the left furnace door 3' and the right furnace door 4' are fully opened, the elastic contact of the door opening limit switch 12 and the right rack at the rack connecting portion 603' of the right link 6' are as shown in FIG. The lug 204' of the 2' right end 201' touches. When the left furnace door 3' and the right furnace door 4' are closed, the right link 6' and the right rack 2' are fanned to the left; when the left furnace door 3' and the right furnace door 4' are completely closed The lug 204' of the right rack 2 at the rack connecting portion 603 of the right link 6' will come into contact with the elastic contact of the door closing limit switch 13'.

When the left furnace door 3' and the right furnace door 4' are completely closed, the cylindrical microwave oven of the present embodiment is installed. Referring to FIG. 10 after removing the outer casing, a long and narrow window 52 on the bracket 51' is extended. The root conversion rod 22' has a root portion that is fixed to the cam shaft 18' by a short pin 1802' and its rod body extends radially outward. The end of the free end of the shifting lever 22' extends beyond the housing of the microwave oven. The shifting lever 22 functions to rotate the camshaft 18' for manual/automatic switching. The driven components of the two furnace doors 3', 4' of the present embodiment are mounted on the upper cover 40' to make the opening and closing movements of the two furnace doors 3', 4' more stable. Referring to FIG. 11, the driven assembly includes: a beam 30', a rotating shaft 3Γ, two support frames 32', a U-shaped bracket 33, a left link 35, and a right link 36. Two links 35, 36, V-shaped are hinged on the rotating shaft 31', the lower end of the rotating shaft 31' is inserted in the central hole of the U-shaped bracket 33', and the U-shaped bracket 33' is installed in the middle of the beam 30' Below, the upper end of the rotating shaft 31' is inserted into the shaft hole 301' in the center of the beam 30'. Two support frames 32 are symmetrically separated on the upper cover 40, on both sides of the upper surface, and the two ends of the beam 30 are respectively fixed on the two support frames 32, and the two links 35, 36, V The hinged shaft 31 is disposed at the center of the beam 30 above the furnace chamber, that is, at the position of the center of rotation of the two furnace doors 3, 4, 4. The free ends of the two V-shaped hinged links 35', 36' are respectively fixed to the upper edges of the left furnace door 3' and the right furnace door 4.

In another application, if the microwave generator is disposed below the furnace chamber to introduce microwaves from the side into the furnace chamber, the door opening mechanism of the present invention can be placed above the furnace chamber. INDUSTRIAL APPLICABILITY The cylindrical microwave oven of the present invention has a cylindrical cavity, and the radius of rotation of the rotating tray is a cylindrical diameter, which increases the effective space in the cavity, so that the space is utilized to facilitate the reflection distribution of the microwave, and the microwave is saved. The heating time of the object improves the working efficiency. The split-arc sliding door is used, and after the door is opened, the two furnace doors slide on the circular slideway and are simultaneously opened, which saves the external space required for the hinged door opening. After the microwave oven is opened, half of the furnace cavity is exposed, which facilitates the pick-and-place of the microwave heating vessel and has the convenience of easily cleaning the inside of the furnace chamber. The door opening mechanism adopts two V-shaped interconnected four-link structures with opposite openings, which can make the two furnace doors face at the same time, with the same degree of sealing, and the sealing effect is good when closed. In addition, the cylindrical microwave oven of the present invention further provides a door opening mechanism, which uses an electric motor to drive two gears to rotate at the same time, each driving a rack and its connected connecting rod and furnace door for opening or closing movement to realize two fans. The furnace door automatically opens and closes the door in conjunction with each other. The structure of the door opening mechanism does not have a motion blind spot, the operation is stable, the commutation is convenient, and the utility model is suitable for the flexible working characteristics of the motor, and is also easy to realize manual or automatic operation. The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and equivalent changes and modifications made in accordance with the technical solutions and the contents of the specification of the present invention are all included in the scope of the present invention.

Claims

Rights request

A cylindrical microwave oven having a furnace chamber and a microwave generator for radiating microwaves into the furnace chamber; a furnace door having a closed furnace chamber and being openable in front of the casing; A disc-shaped upper cover, a U-shaped plate and a disc-shaped lower cover constitute a cylindrical cavity open at the front, the U-shaped plate is supported between the upper cover and the lower cover; the furnace door is open to the front of the closed cavity An arc plate that can be opened.

2. A cylindrical microwave oven according to claim 1, wherein: said furnace door is divided into two fans that are separated along a circular slide, and the casing is mounted with two furnace doors linked to open The opening mechanism of the door.

3. A cylindrical microwave oven according to claim 2, wherein: said door opening mechanism comprises two long links, two short links and one guide plate; and two long links are V-shaped hinged The hinge shaft is hinged on one end side of the guide plate; the free ends of the two long links are respectively fixed on the inner lower part of the furnace door on the same side of the two furnace doors; the two short links are V-shaped hinged, The hinge shaft is slidably coupled to the other end side of the guide plate; the free ends of the two short links are respectively hinged at the waist of the long link on the same side of the two long links; the guide plate is fixedly mounted on the housing on.

A cylindrical microwave oven according to claim 2, wherein: said two furnace doors are provided with a hook connecting mechanism at the butt edge.

5. The cylindrical microwave oven according to claim 1, wherein the door opening mechanism is that the two furnace doors in the microwave casing are openably closed to open the front of the cylindrical cavity. a rotating shaft V-shaped hinged two connecting rods are arranged on the rotating center of the two furnace doors; the free ends of the two connecting rods are respectively fixed on the same side furnace door; two on one concentric circle of the rotating center are arranged, a circular arc-shaped rack that is staggered and can be fan-shaped, and the ends of the two racks that are fan-shaped and unfolded are connected to one of the connecting rods; two symmetrical lines are formed in the fan-shaped shape of the two racks One gear is disposed on each side, and the two gears mesh with each other and respectively mesh with a rack, wherein the first gear is connected to the motor.

The cylindrical microwave oven according to claim 5, wherein the door opening mechanism has a drive gear mounted on the motor shaft; the rotating shafts of the two gears are mounted on a translation assembly; The drive gear meshes with the first gear when the assembly is in the first position; the drive gear disengages from the first gear when the translation assembly is translated to the second position.

The cylindrical microwave oven according to claim 6, wherein the translation assembly of the door opening mechanism is a U-shaped piece mounted on the toothed side of the two racks, and the U-shaped piece is opened by two Flat section Each of the two shaft holes respectively has a rotating shaft for mounting two gears; when the u-shaped piece is in the first position, the two gears respectively mesh with the corresponding racks and the driving gear meshes with the first gear; the U-shaped piece When translated to a second position away from the toothed side of the two racks, the two gears are disengaged from the respective racks and the drive gear is disengaged from the first gear.

A cylindrical microwave oven according to claim 7, wherein said U-shaped ferrule is mounted on a guide box mounted on the microwave oven housing; and each of the two flat portions of the U-shaped sheet is provided a long guiding hole, the upper and lower surfaces of the guiding box each have a convex strip stuck in a corresponding long guiding hole of the U-shaped piece; the guiding box is provided with two arc-shaped guiding grooves which are respectively shifted up and down to accommodate the Two racks, the two gears are respectively mounted in the rack guiding box, wherein the first gear has a coaxial pinion; when the U-shaped piece is in the first position, the upper and lower surfaces of the guiding box are convex The strip is located at one end of the corresponding long guide hole of the U-shaped piece, the two gears respectively mesh with the corresponding rack and the drive gear of the motor meshes with the pinion gear of the first gear; when the U-shaped piece is translated to the second position, the guide is guided The ribs on the upper and lower surfaces of the box are located at the other end of the corresponding long guide hole of the U-shaped piece, the two gears are respectively disengaged from the corresponding racks and the drive gears of the motor are disengaged from the pinion gears of the first gear.

9. The cylindrical microwave oven according to claim 7, wherein the upper and lower surfaces of the guide box each have a lug extending outward from an edge away from the toothed side of the two racks, two Each of the lugs has a shaft hole; a cam is disposed between the two lugs, and the rotating shaft of the cam is inserted in the shaft holes of the two lugs; the two flat portions of the U-shaped sheet are respectively provided with cam shafts The U-shaped piece is in the first position when the highest point of the cam is offset from the groove bottom of the U-shaped piece; the U-shaped piece is in the second position when the highest point of the cam is against the groove bottom of the U-shaped piece; A tension spring connection guide box is attached to each end of the bottom of the groove.

10. A cylindrical microwave oven according to claim 9, wherein: said rotating shaft of said cam is connected to a radially extending switching rod, and the end of the free end of said switching rod extends beyond the housing of the microwave oven.

11. The cylindrical microwave oven according to claim 9, wherein: the guide box is divided into upper and lower portions, and an arcuate guide groove of the upper guide box is disposed between the curved guide groove of the lower guide box and the arc guide groove of the lower guide box. A block.

The cylindrical microwave oven according to claim 6 or 7 or 8 or 9 or 10 or 11 or 12, wherein the microwave oven housing is provided with a door opening limit switch and a door closing limit switch; The switch touches one of the two connecting rods when the furnace door is completely opened, and the door closing limit switch is in the furnace The door is in contact with the connecting rod when the door is completely closed; the door opening limit switch and the door closing limit switch respectively control the circuit board with the motor.

The cylindrical microwave oven according to claim 12, wherein: the V-shaped hinge shaft of the two connecting rods is a rotating shaft of the microwave oven turntable; and the free ends of the two connecting rods are respectively fixed at the lower edge of the same side furnace door on.

The cylindrical microwave oven according to claim 13, wherein the upper edges of the two furnace doors respectively fix the free ends of the other two V-shaped hinged links, and the two links are V-shapedly hinged. The rotating shaft is arranged at a position where the center of rotation of the two furnace doors is located above the furnace chamber.