CN112205888B

CN112205888B - Electric oven

Info

Publication number: CN112205888B
Application number: CN202011069510.6A
Authority: CN
Inventors: 余浩; 杨均
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-10-22
Anticipated expiration: 2040-09-30
Also published as: CN112205888A

Abstract

The invention relates to an electric oven, wherein a heat dissipation channel is arranged between a liner back plate and a box body back plate, the upper end and the lower end of the heat dissipation channel are respectively provided with a bottom air inlet and a top air outlet, the bottom air inlet is in fluid communication with an interlayer between the liner bottom plate and the box body bottom plate, the top air outlet is in fluid communication with a top air inlet of an exhaust channel, an air inlet of a centrifugal fan is in fluid communication with the bottom air inlet, and an air outlet of the centrifugal fan is in fluid communication with the top air outlet. The invention can realize the heat dissipation of the bottom of the oven, avoid the influence of the accumulation of the residual heat at the bottom of the oven on the performance of the oven and the service life of the cabinet, avoid the heat dissipation of the inner container from being too fast due to the heat dissipation channel and ensure the cooking efficiency of the oven.

Description

Electric oven

Technical Field

The invention relates to the field of cooking devices, in particular to an electric oven.

Background

The oven is a cooking device that utilizes inside heating element's heat radiation to heat food, the heating element of current oven generally includes the top heating pipe, back heating pipe and bottom heating pipe, wherein the top heating pipe is installed on the interior top surface of oven inner bag, the bottom heating pipe is installed on the outer bottom surface of oven inner bag, and the vertical hot-blast baffle of installing in rear side of oven inner bag, this hot-blast baffle encloses into hot-blast room with the backplate of inner bag, the flabellum of the air heater of oven is installed in this hot-blast room, and above-mentioned back heating pipe encloses the periphery of establishing at this flabellum.

The top of current oven inner bag generally is provided with the heat dissipation channel who has cooling fan, and the steam that produces in the culinary art in-process inner bag like this can get into the heat dissipation channel through under cooling fan's suction effect in, arrange outward through the heat dissipation channel after that. In addition, the heat dissipation channel above the inner container can dissipate heat of the top of the oven at the same time. As described above, the back heating pipe and the bottom heating pipe are respectively installed at the back and the bottom of the oven, so that the heat transmitted from the back heating pipe and the bottom heating pipe to the back and the bottom of the oven can cause residual heat accumulation at the back and the bottom of the oven, the existing oven is generally installed in a mode of being embedded into a cabinet, the residual heat accumulation can affect the oven and the cabinet, and the performance of the oven and the service life of the cabinet are affected.

In order to solve the above problems, in the prior art, a back airflow channel and a bottom airflow channel are respectively arranged at the back and the bottom of the oven, and the back airflow channel and the bottom airflow channel are communicated and are communicated with a heat dissipation channel at the top of the oven, so that cold air entering from the bottom of the oven sequentially dissipates heat at the bottom and the back of the oven through the rotation of a heat dissipation fan. Although the method can solve the problem of residual heat accumulation at the back and the bottom of the oven to a certain extent, the following problems still exist: (1) cold air enters from the bottom of the oven in the working process, and the heat of the inner container of the oven is dissipated too fast in the process that the cold air flows along the airflow channel, so that the cooking efficiency of the oven is influenced; (2) the heat dissipation fan at the top of the oven is used for driving the heat dissipation fan to enter air from the bottom of the oven, the air inlet path process is carried out, the efficiency is low, and therefore the heat dissipation effect on the back and the bottom of the oven is not good.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide an electric oven that can effectively avoid the accumulation of residual heat at the bottom of the oven on the basis of not affecting the cooking efficiency.

The second technical problem to be solved by the present invention is to provide an electric oven that can effectively avoid preheating and accumulation of the bottom and the back of the oven without affecting the cooking efficiency.

The technical scheme adopted by the invention for solving at least one technical problem is as follows: an electric oven comprises a box body, an inner container arranged in the box body and an exhaust passage arranged above the inner container and provided with an exhaust fan, wherein the rear side of the inner container inner cavity is provided with a hot air baffle plate, the back of the inner container is provided with a hot air fan, the hot air baffle plate and the back plate of the inner container are enclosed to form a hot air chamber, a hot air fan blade of the hot air fan is positioned in the hot air chamber, a motor of the hot air fan is positioned outside the back plate of the inner container, the outer periphery of the hot air fan blade is provided with a heating pipe, the electric oven is characterized in that,

the cooking device is characterized in that a vertically extending heat dissipation channel with a centrifugal fan is arranged between the back plate of the inner container and the back plate of the box body, the upper end and the lower end of the heat dissipation channel are respectively provided with a bottom air inlet and a top air outlet, the bottom air inlet is in fluid communication with an interlayer between the bottom plate of the inner container and the bottom plate of the box body, the top air outlet is in fluid communication with the top air inlet of the exhaust channel, an air inlet of the centrifugal fan is in fluid communication with the bottom air inlet, an air outlet of the centrifugal fan is in fluid communication with the top air outlet, the cooking device further comprises a clutch assembly, the clutch assembly can enable centrifugal fan blades of the centrifugal fan to be separated from a motor shaft of the hot air fan in a cooking state, and the clutch assembly can enable the centrifugal fan blades of the centrifugal fan to be linked with the motor shaft of the hot air fan to rotate after cooking is finished.

Furthermore, the centrifugal fan and the air heater are arranged in parallel front and back, the clutch assembly comprises a clutch plug which is arranged on a motor shaft of the air heater and is provided with an electromagnetic coil and a clutch socket which is arranged at the center of the centrifugal fan blade and can be inserted by the clutch plug, and the clutch plug has magnetism and can be inserted into the clutch socket through the magnetic attraction effect with the clutch socket when the electromagnetic coil is in a power-on state. Therefore, the connection and the separation of the clutch plug and the clutch socket can be realized by controlling the on-off of the electromagnetic coil, and the linkage and the separation of the centrifugal fan blade of the centrifugal fan and the motor shaft of the air heater can be further realized.

Furthermore, the rear end of the air heater is provided with a mounting sleeve which takes a motor shaft as a center along the front-back direction, the clutch plug is embedded in the mounting sleeve, the motor shaft penetrates through the center of the clutch plug, the clutch plug comprises a mounting block positioned at the front end of the clutch plug and a mounting seat positioned at the rear end of the clutch plug, the mounting block is cylindrical in shape, the electromagnetic coil surrounds the outer peripheral surface of the mounting block, the mounting seat comprises a first mounting plate and a second mounting plate which are oppositely arranged in the front-back direction, the first mounting plate and the second mounting plate are annular in shape, connecting columns extending along the front-back direction are arranged on the rear surface of the first mounting plate at intervals along the circumferential direction, connecting sliding sleeves which correspond to the connecting columns one by one and are respectively used for inserting the corresponding connecting columns and sliding back and forth and back, clamping shafts which correspond to the connecting sliding sleeves one by one are convexly arranged on the rear surface of the second mounting plate, each clamping shaft extends along the front-back direction respectively, a return spring is sleeved on the connecting column of the first mounting plate and the corresponding connecting sliding sleeve of the second mounting plate respectively, each return spring is limited between the back surface of the first mounting plate and the front surface of the second mounting plate respectively, the center hole of the first mounting plate is connected with the back end surface of the mounting block, the back end part of the motor shaft extends outwards along the circumferential direction to form a limiting lug limited in the center hole of the second mounting plate, the centrifugal fan blade comprises the clutch socket positioned at the center of the centrifugal fan blade, the clutch socket is cylindrical in shape, centrifugal blades are arranged on the peripheral surface of the clutch socket at intervals along the circumferential direction, the front end surface of the clutch socket is inwards recessed along the axial direction to form a clutch slot with a circular section, and clamping grooves which correspond to the clamping shafts one to one and are used for inserting the corresponding clamping shafts are arranged on the back slot wall of the clutch slot, and when each clamping shaft is inserted into the corresponding clamping groove, each return spring can enable each clamping shaft to have the tendency of being separated from the corresponding clamping groove. The electromagnetic coil is electrified to enable the clutch plug to have magnetism, so that each clamping shaft moves backwards under the action of attraction force and is clamped into the corresponding clamping groove, the motor shaft of the air heater rotates and simultaneously drives the clutch socket to rotate, further the centrifugal fan is driven to rotate, the first mounting plate and the second mounting plate are in the maximum distance through the relative movement of the connecting sliding sleeve and the connecting column, and each reset spring is stretched to be in an energy storage state; when the electromagnetic coils are powered off, the clamping shafts are separated from the corresponding clamping grooves, the second mounting plate is reset under the elastic force action of the reset spring, the clutch plug is restored to the initial state, and the motor shaft of the air heater is separated from the centrifugal fan blades of the centrifugal fan.

Furthermore, the centrifugal fan also comprises a fan shell with a disc-shaped appearance, the centrifugal fan blades are arranged in the fan shell and are concentric with the central shaft of the fan shell, the heat dissipation channel comprises a first heat dissipation channel positioned above the fan shell and a second heat dissipation channel positioned below the fan shell, the upper side wall of the fan shell is provided with the air outlet communicated with the first heat dissipation channel, the lower side wall of the fan shell is provided with a lower air inlet communicated with the second heat dissipation channel, the ports of the free ends of the first heat dissipation channel and the second heat dissipation channel are respectively a top air outlet and a bottom air inlet of the heat dissipation channel, and the front side wall of the fan shell at the upper side of the lower air inlet is provided with an air deflector which is arranged in parallel up and down with the lower side wall of the fan shell where the lower air inlet is positioned, and the length of the air deflector is at least equal to that of the air inlet, and the air deflector and the air inlet are arranged in an up-down opposite mode. The air guide plate can prevent the air field formed in the fan shell by the rotation of the centrifugal fan blades from interfering the air inlet of the lower air inlet, so that the air inlet of the bottom air inlet can smoothly enter the fan shell through the lower air inlet and can enter the air outlet along with the rotation of the centrifugal fan blades.

Furthermore, the length of the air deflector is longer than the lower air inlet, two ends of the air deflector respectively protrude out of corresponding ends of the lower air inlet, and one end of the air deflector, which is opposite to the rotation direction of the centrifugal fan blades, is bent downwards in an arc shape and is connected with the lower side wall of the fan shell. Therefore, in the rotating process of the centrifugal fan blade, certain negative pressure can be formed at the opening of the unconnected end of the air deflector and the lower side wall of the fan shell, so that hot air in an interlayer between the inner container bottom plate and the oven bottom plate can be better driven to enter the bottom air inlet and enter the fan shell along the second heat dissipation channel.

Thus, the air entering from the lower air inlet can enter the air outlet more smoothly along with the rotation of the centrifugal fan blades.

Furthermore, the blades of the centrifugal fan blade are all in a long strip shape, and each blade is bent in an arc shape towards the rotating direction of the centrifugal fan blade after the inner side end of the blade extends along the radial direction. Therefore, the air flow at the lower air inlet can be better brought into an air field formed by the rotation of the centrifugal fan blades through the rotation of the centrifugal fan blades, and the smooth air outlet from the air outlet can be facilitated.

Furthermore, the rear side of the fan shell of the centrifugal fan is opened to form the air inlet, an air inlet cavity which can be communicated with the space between the back plate of the liner and the back plate of the box body is arranged on the air inlet, and an air inlet fan blade which rotates coaxially with the centrifugal fan blade is arranged in the air inlet cavity. When the centrifugal fan blades rotate, the air inlet fan blades rotate synchronously, hot air between the back plate of the inner container and the back plate of the box body is sucked into the air inlet cavity and then enters the fan shell through the air inlet, the hot air entering the fan shell can enter the first heat dissipation channel from the air outlet of the fan shell under the action of centrifugal force, and then the hot air enters the exhaust channel at the top to be discharged outwards, so that the heat dissipation of the back of the oven is realized, and the influence on the performance of the back of the oven and the service life of the cabinet due to overhigh temperature of the back of the oven is avoided.

Further, the air inlet flabellum is axial fan blade, the air inlet upper shield of above-mentioned fan shell is equipped with the air inlet cover, the inner chamber of this air inlet cover forms above-mentioned air inlet chamber, and the appearance of this air inlet cover rear end is whole to be round platform form, it includes vertically extending circular air inlet terminal surface and by the air inlet anchor ring that the periphery of this air inlet terminal surface is extended by preceding to back slope inwards along the week, evenly laid circular shape first fresh air inlet on the above-mentioned air inlet terminal surface, and this air inlet anchor ring all is equipped with the banding second fresh air inlet that extends along the width direction of this air inlet anchor ring along the circumference interval, seted up on the backplate of above-mentioned box with external communicating third fresh air inlet. Therefore, the first air inlet hole in the air inlet end face can effectively suck cold air from the outside through the third air inlet hole in the oven back plate, hot air between the liner back plate and the oven back plate can be sucked into the air inlet cavity through the first air inlet hole in the air inlet annular face, the cold air and the hot air are mixed for the first time in the air inlet cavity and then enter the fan shell, and are mixed again under the rotation of the centrifugal fan blades, so that the heat dissipation effect on the back of the oven is improved.

Furthermore, the back plate of the box body is recessed backwards to form an air inlet groove matched with the rear end of the air inlet cover, the third air inlet holes are circumferentially arranged on the periphery of the air inlet groove, the rear end of the air inlet cover and the air inlet groove are arranged in parallel in the front and back direction, the part of the rear end of the air inlet cover is positioned in the air inlet groove, and an air inlet gap is reserved between the outer peripheral surface of the rear end of the air inlet cover and the inner peripheral surface of the air inlet groove. Because the air inlet fan blade is an axial flow fan blade, the cold air entering the third air inlet hole can be divided by adopting the design, wherein most of the cold air enters the air inlet cavity through the first air inlet hole, and part of the cold air can move to the second air inlet hole and is premixed with the hot air at the second air inlet hole, so that the heat dissipation effect on the back of the oven is further improved.

Furthermore, the front end of the air inlet cover is a vertically extending circular air outlet end face, the periphery of the air outlet end face is circumferentially and smoothly connected with the periphery of the air inlet ring face, an air outlet matched with the air inlet of the fan shell in size is formed in the center of the air outlet end face, and the opening edge of the air outlet is connected with the opening edge of the air inlet of the fan shell through a front-back extending air guide ring in the circumferential direction. Because the air inlet fan blade is an axial flow fan blade which discharges air along the axial direction, the design of the air guide ring ensures that the airflow in the air inlet cavity is pressurized at the position (the cross section of the air guide ring is smaller than other positions of the air inlet cavity), and the air can be efficiently input into the fan shell through the air inlet of the fan shell along the air outlet direction of the air inlet fan blade.

Compared with the prior art, the invention has the advantages that: a vertically extending heat dissipation channel with a centrifugal fan is arranged between the back plate of the liner and the back plate of the box body, the upper end and the lower end of the heat dissipation channel are respectively provided with a bottom air inlet and a top air outlet, thus when the centrifugal fan works, hot air formed by transferring the liner to an interlayer below the liner can enter the heat dissipation channel from the bottom air inlet under the action of the suction force of the centrifugal fan, and the hot air entering the centrifugal fan can enter the exhaust channel for being discharged outside from an air outlet of the centrifugal fan through the top air outlet under the action of the centrifugal force of the centrifugal fan, thereby realizing the heat dissipation of the bottom of the oven, avoiding the influence of the accumulation of residual heat at the bottom of the oven on the performance of the oven and the service life of the cabinet, and compared with the prior mode of independently depending on the exhaust fan as the driving force, the centrifugal fan is additionally arranged in the heat dissipation channel of the invention, the heat dissipation driving force is stronger, and the heat dissipation air inlet path is shortened, consequently, can effectively improve the radiating efficiency to the oven bottom, in addition, can realize centrifugal fan's centrifugal fan blade and the motor shaft of air heater's looks through clutch assembly and break away from and the linkage, like this under the culinary art state, centrifugal fan is out of work, thereby avoid radiating channel to make the inner bag heat scatter and disappear at the excessive speed, guarantee the culinary art efficiency of oven, and after the culinary art is finished, centrifugal fan can rotate under the drive of air heater, thereby realize the heat dissipation to the oven bottom, and centrifugal fan utilizes the motor of the original air heater of oven to be drive power, need not to establish drive arrangement in addition, moreover, the steam generator is simple in structure, and the motor that utilizes the air heater can realize the drive to hot-blast fan blade and centrifugal fan's centrifugal fan blade simultaneously.

Drawings

FIG. 1 is a schematic view of an electric oven according to an embodiment of the present invention;

FIG. 2 is a schematic view of a partial structure of an electric oven according to an embodiment of the present invention;

FIG. 3 is an exploded view of a portion of an electric oven according to an embodiment of the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a schematic structural diagram of a centrifugal fan blade according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a mounting base according to an embodiment of the present invention;

FIG. 7 is a cross-sectional view of an electric oven according to an embodiment of the present invention;

FIG. 8 is an enlarged view of portion B of FIG. 7;

FIG. 9 is an exploded view of another embodiment of the electric oven of the present invention;

figure 10 is an exploded view of still another partial structure of the electric oven in accordance with the embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 10, an electric oven includes a box 1, an inner container 10 disposed in the box 1, and an exhaust passage 8 disposed above the inner container 10 and having an exhaust fan 81, wherein a hot air baffle 2 is disposed at a rear side of an inner cavity of the inner container 10, a hot air blower 3 is disposed at a back of the inner container 10, the hot air baffle 2 and a back plate of the inner container 10 define a hot air chamber 20, a hot air fan blade 31 of the hot air blower 3 is disposed in the hot air chamber 20, a motor of the hot air blower 3 is disposed outside the back plate of the inner container 10, and a heating pipe 21 is disposed at an outer periphery of the hot air fan blade 31.

A vertically extending heat dissipation channel 70 with a centrifugal fan 5 is disposed between the back plate of the inner container 10 and the back plate of the box 1, the upper and lower ends of the heat dissipation channel 70 are respectively a bottom air inlet 720 and a top air outlet 710, wherein the bottom air inlet 720 is in fluid communication with an interlayer 91 between the bottom plate of the inner container 10 and the bottom plate of the box 1, the top air outlet 710 is in fluid communication with the top air inlet 82 of the exhaust channel 8, an air inlet 511 of the centrifugal fan 5 is in fluid communication with the bottom air inlet 720, and an air outlet 513 of the centrifugal fan 5 is in fluid communication with the top air outlet 710. The cooking device is characterized by further comprising a clutch assembly 4, wherein in a cooking state, the clutch assembly 4 can enable the centrifugal fan blade 52 of the centrifugal fan 5 to be separated from the motor shaft 30 of the air heater 3, and after cooking is finished, the clutch assembly 4 can enable the centrifugal fan blade 52 of the centrifugal fan 5 to be linked with the motor shaft 30 of the air heater 3 to rotate.

Thus, a vertically extending heat dissipation channel 70 with a centrifugal fan 5 is arranged between the back plate of the inner container 10 and the back plate of the box body 1, the upper end and the lower end of the heat dissipation channel 70 are respectively provided with a bottom air inlet 720 and a top air outlet 710, so that when the centrifugal fan 5 works, hot air formed by the inner container 10 transferring to the interlayer 91 below the inner container can enter the heat dissipation channel 70 from the bottom air inlet 720 under the action of the suction force of the centrifugal fan 5, and the hot air entering the centrifugal fan 5 can enter the exhaust channel 8 to be discharged outside from the top air outlet 710 from the air outlet 513 under the action of the centrifugal force of the centrifugal fan 5, thereby realizing the heat dissipation of the bottom of the oven, avoiding the influence of the residual heat accumulation of the bottom of the oven on the performance of the oven and the service life of the cabinet, and compared with the existing mode of independently depending on the exhaust fan 81 as the driving force, the centrifugal fan 5 is additionally arranged in the heat dissipation channel 70 of the invention, the heat dissipation driving power is stronger, and the heat dissipation air inlet route shortens, consequently, can effectively improve the radiating efficiency to the oven bottom, in addition, can realize the centrifugal fan blade 52 of centrifugal fan 5 and the motor shaft 30 of air heater 3's looks breaking away from and the linkage through clutch assembly 4, like this under the culinary art state, centrifugal fan 5 is out of work, thereby avoid radiating channel 70 to make inner bag 10 heat scatter and disappear too fast, guarantee the culinary art efficiency of oven, and after the culinary art is finished, centrifugal fan 5 can rotate under the drive of air heater 3, thereby realize the heat dissipation to the oven bottom, and centrifugal fan 5 utilizes the original motor of air heater 3 of oven to be drive power, need not to establish drive arrangement in addition, moreover, the steam generator's motor can realize the drive to hot-blast fan blade 31 and centrifugal fan 5's centrifugal fan blade 52 simultaneously.

In this embodiment, the centrifugal fan 5 and the hot air blower 3 are arranged in parallel, the clutch assembly 4 includes a clutch plug 41 having an electromagnetic coil 413 and mounted on the motor shaft 30 of the hot air blower 3, and a clutch socket 42 disposed at the center of the centrifugal fan blade 52 and into which the clutch plug 41 can be inserted, and in the energized state of the electromagnetic coil 413, the clutch plug 41 has magnetism and can be inserted into the clutch socket 42 by magnetic attraction with the clutch socket 42. In this way, the connection and disconnection between the clutch plug 41 and the clutch socket 42 can be realized by controlling the on/off of the electromagnetic coil 413, and further, the linkage and disconnection between the centrifugal fan blade 52 of the centrifugal fan 5 and the motor shaft 30 of the air heater 3 are realized.

Specifically, in the present embodiment, the rear end of the air heater 3 is provided with the mounting sleeve 32 centering on the motor shaft 30 thereof along the front-rear direction, the clutch plug 41 is embedded in the mounting sleeve 32, the motor shaft 30 is inserted into the center of the clutch plug 41, the clutch plug 41 includes the mounting block 411 at the front end thereof and the mounting seat 412 at the rear end thereof, the mounting block 411 has a cylindrical shape, the electromagnetic coil 413 surrounds the outer circumferential surface of the mounting block 411, the mounting seat 412 includes the first mounting plate 4121 and the second mounting plate 4122 which are arranged in front-rear direction, the first mounting plate 4121 and the second mounting plate 4122 have circular shapes, wherein the rear surface of the first mounting plate 4121 is provided with the connecting posts 414 extending along the front-rear direction at intervals along the circumferential direction, the front surface of the second mounting plate 4122 is provided with the connecting sliding sleeves 415 which are respectively inserted into the corresponding connecting posts 414 and slide back-forth and back in one-to-one correspondence with the connecting posts 414, the rear surface of the second mounting plate 4122 is provided with clamping shafts 416 corresponding to the connecting sliding sleeves 415 in a protruding manner, each clamping shaft 416 extends along the front-rear direction, the connecting column 414 of the first mounting plate 4121 and the corresponding connecting sliding sleeve 415 of the second mounting plate 4122 are respectively sleeved with a return spring 417, each return spring 417 is limited between the rear surface of the first mounting plate 4121 and the front surface of the second mounting plate 4122, the central hole of the first mounting plate 4121 is connected with the rear end face of the mounting block 411, the rear end of the motor shaft 30 extends outwards along the circumferential direction to form a limiting lug 301 limited in the central hole of the second mounting plate 4122, the centrifugal fan blade 52 comprises the clutch socket 42 positioned at the center thereof, the clutch socket 42 is cylindrical in shape, centrifugal blades 521 are arranged on the outer circumferential surface at intervals along the circumferential direction, and the front end face is recessed inwards along the axial direction to form a clutch slot 421 with a circular section, the rear wall of the clutch slot 421 is provided with slots 422 corresponding to the shafts 416 and allowing the corresponding shafts 416 to be inserted, and when each shaft 416 is inserted into the corresponding slot 422, each return spring 417 can make each shaft 416 have a tendency to disengage from the corresponding slot 422. Thus, the electromagnetic coil 413 is energized to make the clutch plug 41 have magnetism, so that each clamping shaft 416 moves backwards under the action of attraction force and is clamped into the corresponding clamping groove 422, the motor shaft 30 of the air heater 3 rotates and simultaneously drives the clutch socket 42 to rotate, and further drives the centrifugal fan 5 to rotate, at this time, the first mounting plate 4121 and the second mounting plate 4122 are positioned at the maximum distance through the relative movement of the connecting sliding sleeve 415 and the connecting column 414, and each reset spring 417 is stretched to be in an energy storage state; when the electromagnetic coil 413 is powered off, each clamping shaft 416 is separated from the corresponding clamping groove 422, the second mounting plate 4122 is reset under the elastic force of the reset spring 417, the clutch plug 41 is restored to its initial state, and the motor shaft 30 of the air heater 3 is separated from the centrifugal fan blades 52 of the centrifugal fan 5. In the present invention, the hot fan blade 31 is installed at the front end of the motor shaft 30 of the air heater 3, and the clutch plug 41 is installed at the rear end.

In this embodiment, the centrifugal fan 5 includes a fan case 51 having a disk-like outer shape and the centrifugal fan blade 52 mounted on the fan case 51, and the centrifugal fan blade 52 is disposed concentrically with the central axis of the fan case 51. In addition, the heat dissipation channel 70 includes a first heat dissipation channel 701 located above the fan housing 51 and a second heat dissipation channel 702 located below the fan housing 51, in this embodiment, the first heat dissipation channel 701 and the second heat dissipation channel 702 are respectively formed by inner cavities of a first heat dissipation pipe 71 and a second heat dissipation pipe 72, and an upper end of the first heat dissipation pipe 71 is bent and horizontally extends forward to extend into the exhaust channel 8, so as to form a top air outlet 710 of the heat dissipation channel 70 with a horn-shaped cross section, and an upper end of a lower end of the second heat dissipation pipe 72 is bent and horizontally extends forward to extend into an interlayer 91 between a bottom plate of the inner container 10 and a bottom plate of the box body 1, so as to form a top air outlet 710 of the heat dissipation channel 70 with a horn-shaped cross section. The upper side wall of the fan shell 51 is provided with the air outlet 513 communicated with the first heat dissipation channel 701, the lower side wall of the fan shell 51 is provided with the lower air inlet 512 communicated with the second heat dissipation channel 702, the front side wall of the fan shell 51 on the upper side of the lower air inlet 512 is provided with an air deflector 53 which is arranged in parallel up and down with the lower side wall of the fan shell 51 where the lower air inlet 512 is located, and the length of the air deflector 53 is at least equal to that of the air inlet and the air inlet is arranged in a vertically opposite mode. The air deflector 53 can prevent the air field formed in the fan housing 51 by the rotation of the centrifugal fan blade 52 from interfering with the air intake of the lower air inlet 512, so that the air intake of the bottom air inlet 720 can smoothly enter the fan housing 51 through the lower air inlet 512 and can enter the air outlet 513 along with the rotation of the centrifugal fan blade 52. Preferably, the length of the air guiding plate 53 is longer than the lower air inlet 512, two ends of the air guiding plate 53 respectively protrude from corresponding ends of the lower air inlet 512, and one end of the air guiding plate 53 opposite to the rotation direction of the centrifugal fan blade 52 is bent downward in an arc shape and connected to the lower side wall of the fan casing 51. Thus, the air entering from the lower inlet 512 can enter the outlet 513 more smoothly with the rotation of the centrifugal fan 52. Moreover, the outer shape of each of the blades 521 of the centrifugal fan 52 is elongated, and the inner end of each of the blades 521 extends in the radial direction and then is bent in an arc shape in the rotational direction of the centrifugal fan 52. The air deflector 53 can prevent the air field formed in the fan housing 51 by the rotation of the centrifugal fan blade 52 from interfering with the air intake of the lower air inlet 512, so that the air intake of the bottom air inlet 720 can smoothly enter the fan housing 51 through the lower air inlet 512 and can enter the air outlet 513 along with the rotation of the centrifugal fan blade 52. In this embodiment, during the rotation of the centrifugal fan 52, the circle of the free end of the blade 521 closest to the air outlet end of the air guiding plate 53 intersects with the circle of the air guiding plate 53, so that the air in the lower air inlet 512 can be better brought into the wind field formed by the rotation of the centrifugal fan 52.

The rear side of the fan shell 51 of the centrifugal fan 5 is opened to form the air inlet 511, the air inlet 511 is provided with an air inlet chamber 60 which can be communicated with the space between the back plate of the liner 10 and the back plate of the box body 1, and the air inlet chamber 60 is provided with an air inlet fan blade 61 which rotates coaxially with the centrifugal fan blade 52. When the centrifugal fan blade 52 rotates, the air inlet fan blade 61 rotates synchronously, so that hot air between the back plate of the liner 10 and the back plate of the box body 1 is sucked into the air inlet cavity 60, then enters the fan shell 51 through the air inlet 511, and the hot air entering the fan shell 51 can enter the first heat dissipation channel 701 from the air outlet 513 of the fan shell 51 under the action of centrifugal force, and then enters the exhaust channel 8 at the top to be discharged outwards, so that the heat dissipation on the back of the oven is realized, and the influence on the performance of the oven and the service life of the cabinet caused by overhigh temperature of the back of the oven is avoided. In this embodiment, the air inlet fan blade 61 is an axial flow fan blade, the air inlet 511 of the fan casing 51 is covered with an air inlet cover 6, the inner cavity of the air inlet cover 6 forms the air inlet cavity 60, and the rear end of the air inlet cover 6 is integrally circular truncated cone-shaped, and includes a circular air inlet end surface 62 extending vertically and an air inlet ring surface 63 formed by the circumference of the air inlet end surface 62 extending from front to back and extending obliquely inwards, the circular first air inlet holes 621 are uniformly distributed on the air inlet end surface 62, the air inlet ring surface 63 is provided with strip-shaped second air inlet holes 631 extending along the width direction of the air inlet ring surface 63 at intervals along the circumferential direction, and the back plate of the box body 1 is provided with third air inlet holes 11 communicating with the outside. Therefore, the first air inlet hole 621 on the air inlet end surface 62 can effectively suck cold air from the outside through the third air inlet hole 11 on the oven back plate, hot air between the inner container 10 back plate and the oven back plate can be sucked into the air inlet cavity 60 through the first air inlet hole 621 of the air inlet ring surface 63, the cold air and the hot air are mixed for the first time in the air inlet cavity 60 and then enter the fan shell 51, and are mixed again under the rotation of the centrifugal fan blade 52, so that the heat dissipation effect on the back of the oven is improved.

In addition, the back plate of the box body 1 is recessed backwards to form an air inlet groove 12 matched with the rear end of the air inlet cover 6, the third air inlet holes 11 are circumferentially arranged on the periphery of the air inlet groove 12, the rear end of the air inlet cover 6 and the air inlet groove 12 are arranged in parallel in the front-back direction, the part of the rear end of the air inlet cover 6 is positioned in the air inlet groove 12, and an air inlet gap 92 is reserved between the outer peripheral surface of the rear end of the air inlet cover 6 and the inner peripheral surface of the air inlet groove 12. Because the air inlet fan blade 61 is an axial flow fan blade, the design can bypass the cold air entering from the third air inlet hole 11, wherein most of the cold air enters the air inlet cavity 60 through the first air inlet hole 621, and part of the cold air can move to the second air inlet hole 631 and pre-mix with the hot air in the second air inlet hole 631, thereby further improving the heat dissipation effect on the back of the oven. Furthermore, the front end of the air inlet cover 6 is a circular air outlet end surface 64 extending vertically, the periphery of the air outlet end surface 64 is connected with the periphery of the air inlet ring surface 63 along the circumferential direction smoothly, the center of the air outlet end surface 64 is provided with an air outlet 513 matched with the size of the air inlet 511 of the fan shell 51, and the edge of the air outlet 513 is connected with the edge of the air inlet 511 of the fan shell 51 along the circumferential direction through an air guiding ring 65 extending back and forth. Because the air inlet fan blade 61 is an axial flow fan blade, which discharges air along the axial direction, the design of the air guide ring 65 enables the air flow in the air inlet cavity 60 to be pressurized at the position (the cross section of the air guide ring 65 is smaller than other positions of the air inlet cavity 60), and the air can be efficiently input into the fan shell 51 through the air inlet 511 of the fan shell 51 along the air outlet direction of the air inlet fan blade 61.

The working process of the invention is as follows:

when the oven works, the hot air blower 3 rotates to drive the hot fan blade 31 to rotate, so that the air in the inner container 10 is heated. At this time, the electromagnetic coil 413 is not energized, the clutch plug 41 is disengaged from the clutch socket 42, the centrifugal fan blades 52 and the air intake fan blades 61 are not rotated, and the oven is in a cooking state.

When the oven finishes cooking, the hot air blower 3 continues to drive the hot fan blade 31 at the front end to rotate, so that certain heat dissipation can be performed on the inner cavity of the cooked inner container 10. At this time, the electromagnetic coil 413 is energized, the clutch plug 41 and the clutch socket 42 are inserted and connected with each other under the action of magnetic attraction, the hot air blower 3 drives the centrifugal fan blade 52 and the air inlet fan blade 61 at the rear end to rotate synchronously, the cold air outside the back of the oven enters the oven through the third air inlet hole 11 and enters the air inlet cavity 60 through the first air inlet hole 621 and the second air inlet hole 631, the air in the air inlet cavity 60 enters the fan housing 51 through the air inlet 511, meanwhile, the hot air in the interlayer 91 between the bottom plate of the inner container 10 and the bottom plate of the box body 1 enters the fan housing 51 through the bottom air inlet 720 along the second heat dissipation channel 7027, and the hot air between the back plate of the inner container 10 and the back plate of the box body 1 can enter the air inlet cavity 60 through the second air inlet hole, and then is mixed with the cold air entering from the outside and enters the fan housing 51. The gas entering the fan housing 51 can enter the first heat dissipation channel 701 through the air outlet 513, and the gas in the first heat dissipation channel 701 can enter the exhaust channel 8 to be discharged outwards under the driving of the exhaust fan 81.

Therefore, in the invention, the hot air at the bottom of the oven can be discharged by the two-stage driving of the centrifugal fan 5 and the exhaust fan 81, while the hot air at the back of the oven can be discharged by the three-stage driving of the air inlet fan blade 61, the centrifugal fan 5 and the exhaust fan 81, and meanwhile, the heat dissipation effect of the oven is further improved by sucking the cold air outside the back of the oven.

Claims

1. An electric oven, which comprises a box body (1), an inner container (10) arranged in the box body (1) and an exhaust passage (8) which is arranged above the inner container (10) and is provided with an exhaust fan (81), wherein the rear side of the inner cavity of the inner container (10) is provided with a hot air baffle plate (2), the back part of the inner container (10) is provided with a hot air fan (3), the hot air baffle plate (2) and the back plate of the inner container (10) enclose a hot air chamber (20), a hot air fan blade (31) of the hot air fan (3) is positioned in the hot air chamber (20), the motor of the hot air fan (3) is positioned outside the back plate of the inner container (10), and the outer periphery of the hot air fan blade (31) is provided with a heating pipe (21), and is characterized in that,

a vertically extending heat dissipation channel (70) with a centrifugal fan (5) is arranged between the back plate of the liner (10) and the back plate of the box body (1), the upper end and the lower end of the heat dissipation channel (70) are respectively provided with a bottom air inlet (720) and a top air outlet (710), wherein the bottom air inlet (720) is in fluid communication with an interlayer (91) between the bottom plate of the liner (10) and the bottom plate of the box body (1), the top air outlet (710) is in fluid communication with the top air inlet (82) of the exhaust channel (8), an air inlet (511) of the centrifugal fan (5) is in fluid communication with the bottom air inlet (720), an air outlet (513) of the centrifugal fan (5) is in fluid communication with the top air outlet (710), the heat dissipation device further comprises a clutch assembly (4), and in a cooking state, the clutch assembly (4) can enable a centrifugal fan blade (52) of the centrifugal fan (5) to be separated from a motor shaft (30) of the hot air blower (3), after cooking, the clutch component (4) can enable a centrifugal fan blade (52) of the centrifugal fan (5) to be linked with a motor shaft (30) of the hot air blower (3) to rotate, the centrifugal fan (5) and the hot air blower (3) are arranged in parallel front and back, the clutch component (4) comprises a clutch plug (41) which is arranged on the motor shaft (30) of the hot air blower (3) and is provided with an electromagnetic coil (413) and a clutch socket (42) which is arranged on the center of the centrifugal fan blade (52) and can be used for inserting the clutch plug (41), and under the power-on state of the electromagnetic coil (413), the clutch plug (41) has magnetism and can be inserted into the clutch socket (42) through the magnetic attraction effect of the clutch socket (42).

2. The electric oven according to claim 1, wherein the rear end of the hot air blower (3) is provided with a mounting sleeve (32) centering on the motor shaft (30) thereof in the front-rear direction, the clutch plug (41) is embedded in the mounting sleeve (32), the motor shaft (30) is inserted through the center of the clutch plug (41), the clutch plug (41) comprises a mounting block (411) at the front end thereof and a mounting seat (412) at the rear end thereof, the mounting block (411) has a cylindrical shape, the electromagnetic coil (413) surrounds the outer circumferential surface of the mounting block (411),

the mounting seat (412) comprises a first mounting plate (4121) and a second mounting plate (4122) which are arranged in a front-back opposite mode, the first mounting plate (4121) and the second mounting plate (4122) are annular in shape, connecting columns (414) extending in the front-back direction are arranged on the rear surface of the first mounting plate (4121) at intervals along the circumferential direction, connecting sliding sleeves (415) which are in one-to-one correspondence with the connecting columns (414) and are respectively used for inserting the corresponding connecting columns (414) and sliding back and forth are arranged on the front surface of the second mounting plate (4122), clamping shafts (416) which are in one-to-one correspondence with the connecting sliding sleeves (415) are arranged on the rear surface of the second mounting plate (4122) in a protruding mode, the clamping shafts (416) extend in the front-back direction respectively, and return springs (417) are sleeved on the corresponding connecting sliding sleeves (415) of the connecting columns (414) and the second mounting plate (4122) of the first mounting plate (4121) respectively, each return spring (417) is limited between the back surface of the first mounting plate (4121) and the front surface of the second mounting plate (4122), the center hole of the first mounting plate (4121) is connected with the back end surface of the mounting block (411), the back end part of the motor shaft (30) extends outwards along the circumferential direction to form a limiting lug (301) limited in the center hole of the second mounting plate (4122),

the centrifugal fan blades (52) comprise the clutch socket (42) positioned in the center of the centrifugal fan blades, the clutch socket (42) is cylindrical in shape, the centrifugal fan blades (521) are arranged on the outer peripheral surface of the clutch socket at intervals along the circumferential direction, the front end surface of the clutch socket is inwards recessed along the axial direction to form a clutch slot (421) with a circular cross section, clamping grooves (422) which correspond to the clamping shafts (416) one to one and are used for inserting the corresponding clamping shafts (416) are formed in the rear slot wall of the clutch slot (421), and when the clamping shafts (416) are inserted into the corresponding clamping grooves (422), the reset springs (417) can enable the clamping shafts (416) to have the tendency of being separated from the corresponding clamping grooves (422).

3. The electric oven according to claim 1 or 2, wherein the centrifugal fan (5) further comprises a fan housing (51) having a disc shape, the centrifugal fan blades (52) are installed in the fan housing (51) and are concentrically arranged with a central axis of the fan housing (51), the heat dissipation channel (70) comprises a first heat dissipation channel (701) located above the fan housing (51) and a second heat dissipation channel (702) located below the fan housing (51), the upper sidewall of the fan housing (51) is provided with the air outlet (513) communicated with the first heat dissipation channel (701), the lower sidewall of the fan housing (51) is provided with a lower air inlet (512) communicated with the second heat dissipation channel (702), and free ends of the first heat dissipation channel (701) and the second heat dissipation channel (702) are respectively a top air outlet (710) and a bottom air inlet (720) of the heat dissipation channel (70), and the front side wall of the fan shell (51) at the upper side of the lower air inlet (512) is provided with an air guide plate (53) which is arranged in parallel up and down with the lower side wall of the fan shell (51) at which the lower air inlet (512) is positioned, the length of the air guide plate (53) is at least equal to that of the lower air inlet (512), and the air guide plate and the lower air inlet are arranged in an opposite way up and down.

4. The electric oven according to claim 3, wherein the length of the air deflector (53) is longer than the lower air inlet (512), and both ends of the air deflector (53) respectively protrude from the corresponding ends of the lower air inlet (512), and one end of the air deflector (53) opposite to the rotation direction of the centrifugal fan blade (52) is bent downward in an arc shape and connected to the lower side wall of the fan housing (51).

5. The electric oven according to claim 4, characterized in that the blades (521) of the centrifugal fan (52) are elongated in shape, and each blade (521) is curved in an arc shape toward the rotation direction of the centrifugal fan (52) after extending radially from the inner end thereof.

6. The electric oven according to claim 3, characterized in that the rear side of the fan housing (51) of the centrifugal fan (5) is open to form the air inlet (511), the air inlet (511) is provided with an air inlet chamber (60) which can be communicated with the space between the back plate of the inner container (10) and the back plate of the box body (1), and the air inlet chamber (60) is provided with an air inlet fan blade (61) which rotates coaxially with the centrifugal fan blade (52).

7. The electric oven according to claim 6, characterized in that said inlet blades (61) are axial blades, an air inlet cover (6) is covered on the air inlet (511) of the fan shell (51), the inner cavity of the air inlet cover (6) forms the air inlet cavity (60), and the shape of the rear end of the air inlet cover (6) is integrally in a circular truncated cone shape, which comprises a circular air inlet end surface (62) extending vertically and an air inlet ring surface (63) formed by the circumference of the air inlet end surface (62) extending slantways inwards from front to back along the circumference, the air inlet end surface (62) is uniformly provided with a circular first air inlet hole (621), the air inlet ring surface (63) is provided with second strip-shaped air inlet holes (631) which extend along the width direction of the air inlet ring surface (63) at intervals along the circumferential direction, a third air inlet hole (11) communicated with the outside is arranged on the back plate of the box body (1).

8. The electric oven according to claim 7, wherein the rear plate of the box body (1) is recessed rearward to form an air inlet groove (12) matching with the rear end of the air inlet cover (6), the third air inlet holes (11) are circumferentially formed in the outer periphery of the air inlet groove (12), the rear end of the air inlet cover (6) and the air inlet groove (12) are arranged in front and rear side by side, a portion of the rear end of the air inlet cover (6) is located in the air inlet groove (12), and an air inlet gap (92) is formed between the outer periphery of the rear end of the air inlet cover (6) and the inner periphery of the air inlet groove (12).

9. The electric oven according to claim 7, characterized in that the front end of the air inlet hood (6) is a circular air outlet end surface (64) extending vertically, the periphery of the air outlet end surface (64) is connected with the periphery of the air inlet ring surface (63) along the circumferential direction smoothly, an air outlet (513) matched with the size of an air inlet (511) of the fan housing (51) is formed in the center of the air outlet end surface (64), and the edge of the air outlet (513) is connected with the edge of the air inlet (511) of the fan housing (51) along the circumferential direction through an air guiding ring (65) extending forwards and backwards.