A collector mounting structure of a centrifugal fan, a range hood, and a control method thereof

Abstract

The application relates to a collector mounting structure of a centrifugal fan, a range hood and a control method thereof. The collector mounting structure comprises a volute, a collector, a connecting ring, a locking knob, a front side plate, a limiting hole and a limiting rib. The locking knob is arranged on the connecting ring, the front side plate is provided with the limiting hole penetrating front and back, the limiting rib of the locking knob can pass through the limiting hole and can be rotated and switched between a first position opposite to the limiting hole and a second position staggered with the limiting hole, the locking knob is further provided with a locking position, the volute is further provided with a self-locking device, the self-locking device comprises an electromagnetic lock and a position recognition device electrically connected with the electromagnetic lock, the electromagnetic lock comprises a lock tongue, and when the position recognition device recognizes that the locking knob is in the second position, the lock tongue can move towards the locking position of the locking knob and form limiting cooperation with the locking position. The advantages are that the collector is convenient to disassemble and assemble, is firmly mounted, and can be effectively recognized by an operator whether the collector is mounted in place.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of centrifugal fan, in particular to a flow collector mounting structure of centrifugal fan, a range hood and a control method thereof. BACKGROUND

[0002] The range hood is a kind of kitchen electrical appliances for purifying kitchen environment, which is used to rapidly draw away the oil fume harmful to human body generated in the cooking process and improve the kitchen environment. The volute is an important component of the range hood, which generally comprises a front cover plate, a rear cover plate and a ring wall arranged between the front cover plate and the rear cover plate, and a flow collector is arranged at the air inlet of the front cover plate. The front cover plate and the flow collector of the conventional volute are generally assembled together by screw connection, which is very inconvenient to disassemble and assemble.

[0003] Therefore, the Chinese patent application with the application number CN201010576162.1 (the authorized publication number CN102478269B) discloses a volute and a range hood provided with the volute, wherein the air inlet ring is provided with at least one clamping protrusion on the surface thereof facing the air inlet; the front baffle is provided with the same number of clamping notches as the clamping protrusions at the air inlet, the clamping notches correspond to the clamping protrusions one by one, and the clamping notches are for the corresponding clamping protrusions to pass through; the inner surface of the front baffle is provided with the same number of clamping channels as the clamping protrusions at the air inlet, the clamping channels correspond to the clamping notches one by one, and the clamping channels are connected with the corresponding clamping notches; the clamping protrusion can pass through the corresponding clamping notch, thereby rotating the air inlet ring around the center of the air inlet, and the clamping protrusion can enter the corresponding clamping channel, thereby clamping the air inlet ring on the front baffle. In the above patent application, the volute and the air inlet ring are connected by rotating clamping, and in order to avoid the air inlet ring from being reversed out after installation, a corresponding anti-reverse protrusion is arranged in the clamping channel. This structure makes the disassembly and assembly of the air inlet ring still difficult, especially the arrangement of the anti-reverse protrusion makes the user need to use special tools to make the clamping protrusion reverse out, which is time-consuming and laborious, and the assembly efficiency is not high.

[0004] There are also installation structures that connect the collector to the volute using a snap-fit ​​connection. For example, Chinese utility model patent application CN202121628486.5 (authorization announcement number: CN215861006U) discloses a connection structure between the inlet ring and the volute for a centrifugal fan, including: a volute having an air inlet; an inlet ring connected to the air inlet of the volute, including an annular guide portion and an annular wall extending radially outward from the guide portion; the annular wall and the volute are detachably connected together by a snap-fit ​​assembly, the snap-fit ​​assembly including a snap-fit ​​on the inner side of the annular wall and a socket on the volute for inserting the snap-fit. While the snap-fit ​​connection method is convenient for assembly and disassembly, it also has certain drawbacks. During long-term operation or under high wind pressure, the snap-fit ​​connection may loosen due to uneven stress or fatigue, thus affecting the sealing and stability between the inlet ring and the volute. On the other hand, it is difficult for operators to accurately identify whether the air inlet ring is installed correctly; they can only rely on experience or subjective feelings to identify it.

[0005] Therefore, the existing collector installation structure of centrifugal fans still needs further improvement. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a centrifugal fan collector installation structure that is easy to disassemble and assemble, securely installed, and allows operators to effectively identify whether the collector is installed in place, in light of the current state of the prior art.

[0007] The second technical problem to be solved by the present invention is to provide a range hood that uses the above-mentioned centrifugal fan collector mounting structure, in view of the current state of the prior art.

[0008] The third technical problem to be solved by the present invention is to provide a control method for a range hood that can control the self-locking device to prevent oil fumes and dissipate heat according to the actual cooking situation, thereby ensuring the reliability of the locking mechanism, in light of the current state of the prior art.

[0009] The fourth technical problem to be solved by the present invention is to provide a control method for a range hood that effectively links the disassembly process of the collector with the opening and closing of the smoke baffle, thereby improving the user experience, in light of the current state of the prior art.

[0010] The fifth technical problem to be solved by the present invention is to provide a control method for a range hood that can ensure the safety of the collector installation process and thus improve the user experience, in light of the current state of the prior art.

[0011] The technical solution adopted by this invention to solve the first technical problem is: a collector installation structure for a centrifugal fan, comprising:

[0012] The volute includes a front side plate, a rear side plate, and an annular wall connecting the front side plate and the rear side plate, wherein an air inlet is provided on the front side plate;

[0013] The collector, connected to the air inlet of the front panel, includes an annular guide portion and a connecting ring extending radially outward from the guide portion;

[0014] The connecting ring is also provided with a locking knob. The locking knob includes a knob body that is rotatably disposed on the connecting ring and a limiting rib disposed on the knob body. A limiting hole that runs through the front and rear is provided on the front side plate. The limiting rib of the locking knob can pass through the limiting hole and can rotate and switch between a first position opposite to the limiting hole and a second position that is misaligned with the limiting hole.

[0015] The locking knob also has a locking position, and the volute is also provided with a self-locking device. The self-locking device includes an electromagnetic lock and a position identification device electrically connected to the electromagnetic lock. The position identification device is used to identify the rotation position of the locking knob. The electromagnetic lock includes a locking tongue. When the position identification device identifies that the locking knob is in the second position, the locking tongue can move toward the locking position of the locking knob and form a limiting engagement with the locking position.

[0016] To improve the reliability of the locking knob position detection, the locking knob has a pressing support, and the position recognition device is a micro switch. When the locking knob is rotated to the second position, the pressing support of the locking knob abuts against the sensing contact of the micro switch, thus activating the micro switch. It is conceivable that, in addition to the aforementioned micro switch, the position recognition device can also employ inductive proximity sensors, capacitive proximity sensors, photoelectric sensors, Hall effect sensors, infrared sensors, or ultrasonic sensors.

[0017] In order to adapt to the knob body to effectively trigger the sensing contact of the micro switch, the knob body includes a limiting plate, a knob operation part protruding on the front side of the limiting plate, and a protruding post extending rearward from the rear side of the limiting plate. The limiting rib protrudes radially outward from the peripheral wall of the protruding post. A portion of the limiting plate protrudes outward from the outer peripheral edge of the connecting ring. The portion of the limiting plate protruding outward from the outer peripheral edge of the connecting ring is provided with the aforementioned pressing support.

[0018] To effectively protect the electromagnetic lock, especially against oil fumes, the self-locking device also includes a protective cover. The electromagnetic lock and the micro switch are both located inside the protective cover. A movable opening is provided on the side wall of the protective cover facing the locking knob. The movable opening is covered with a rubber seal. Inside the protective cover, at a position opposite to the movable opening, there is also a movable spring that fits against the rubber seal. The sensing contact of the micro switch faces the movable opening and is in contact with the movable spring.

[0019] In order to match the movement trajectory of the pressing support of the locking knob, the rubber seal is provided with an arc-shaped groove on the side facing the locking knob, which allows the pressing support of the locking knob to slide and limit its movement.

[0020] To reduce the amount of fumes entering the protective cover through the gap between the latch and the protective cover, an opening is provided on the side wall of the protective cover facing the locking knob for the latch to pass through. Inside the protective cover, a sealing sleeve is connected to the opening and fitted over the latch. The sealing sleeve contains a labyrinth-type sealing flue. The labyrinth-type sealing flue can adopt a tortuous channel structure, composed of multiple continuous bends. As the gas passes through these tortuous channels, its flow direction constantly changes. Due to the inertia of the gas, each time the direction changes, some of the kinetic energy of the gas molecules is converted into heat energy and lost. Simultaneously, the gas pressure gradually decreases, achieving a sealing effect. Similarly, the labyrinth-type sealing flue can also adopt a comb-shaped or spiral structure.

[0021] To effectively dissipate heat from the electromagnetic lock, the protective cover is also equipped with an air inlet pipe and an air outlet pipe, both communicating with the internal space of the protective cover. The outlet port of the air outlet pipe is located near the air inlet of the volute or extends into the volute, while the inlet port of the air inlet pipe is located away from the air inlet. It is conceivable that this structural design can also effectively replace or remove fumes inside the protective cover, preventing oil stains from accumulating inside the protective cover, especially on the electromagnetic lock.

[0022] In order to automatically dissipate heat when the temperature of the electromagnetic lock rises to a set value, the protective cover has an air outlet port connected to the air outlet pipe, and the protective cover is also equipped with an automatic air exchange valve group that can open and close the air outlet port according to the temperature change inside the protective cover.

[0023] Generally, the temperature change inside the protective cover can be detected by setting a temperature sensor, and the opening and closing of the air outlet port can be achieved by setting a solenoid valve electrically connected to the temperature sensor. Preferably, in order to simplify the structure of the automatic ventilation valve group, the automatic ventilation valve group includes a heat-sensitive spring that can deform when heated and a sealing plug provided on the heat-sensitive spring. The sealing plug is opposite to the air outlet port. The heat-sensitive spring can drive the sealing plug to move closer to the air outlet port to close the air outlet port and move away from the air outlet port to open the air outlet port as its temperature changes.

[0024] As an improvement, the centrifugal fan is a single-inlet fan with air intake only at the front, and the outlet port of the outlet pipe is connected to the rear side plate and communicates with the internal space of the volute.

[0025] As an improvement, the protective cover is further equipped with an oil fume sensor and a controller for detecting the concentration of oil fumes inside the cover. The oil fume sensor and the electromagnetic lock are electrically connected to the controller. The controller controls whether the electromagnetic lock is continuously energized based on the oil fume signal transmitted by the oil fume sensor, thereby automatically opening or closing the air outlet port of the automatic ventilation valve assembly. This structural design allows the electromagnetic lock to be continuously energized for a set time when oil fumes are detected inside the protective cover, thereby increasing the temperature inside the cover's cavity. This triggers the automatic ventilation valve assembly to open the air outlet port, allowing air circulation and removing the oil fumes.

[0026] In order to effectively remind the user to operate the locking knob to the set second position, that is, to improve the user's operating feel, the front side plate has two positioning protrusions on the side wall facing the inside of the volute, which are circumferentially spaced along the locking knob. When the locking knob moves to the second position, the limiting rib is limited between the two positioning protrusions.

[0027] To simplify the installation structure of the collector and further ensure the stability of the collector installation structure, the outer peripheral edge of the connecting ring has outwardly extending pins, and the front side plate has a positioning socket for inserting the pins.

[0028] To further ensure the reliability of the collector installation, the pins and the locking knob are located on opposite sides of the connecting ring about its axis.

[0029] As an improvement, the locking position is a lock slot or lock hole formed on the limiting plate, and the lock tongue can be inserted into the lock slot to restrict the rotation of the locking knob.

[0030] The technical solution adopted by the present invention to solve the second technical problem is: a range hood, including a housing and a fan system, wherein the front side of the housing is provided with a smoke baffle that can be opened and closed by tilting back and forth, and the fan system is a centrifugal fan, wherein the centrifugal fan includes the aforementioned centrifugal fan collector mounting structure.

[0031] The technical solution adopted by this invention to solve the third technical problem is: a control method for a range hood, comprising the following steps:

[0032] After the range hood is started, the self-locking device locks, and the oil fume concentration sensor inside the protective cover detects the oil fume concentration inside the protective cover. If no oil fume is detected, the process ends, and the next detection starts after a set time.

[0033] If the detected oil fume concentration is relatively low, it is then determined whether the centrifugal fan is running. If so, the electromagnetic lock is continuously energized for a set time, the automatic ventilation valve group is heated and activated, the air outlet is opened, and the oil fume inside the protective cover is removed. If not, after waiting for the set time, the oil fume concentration sensor continues to detect the oil fume concentration inside the protective cover.

[0034] If a relatively high concentration of oil fumes is detected, the system determines whether the centrifugal fan is running. If it is, the electromagnetic lock is continuously energized for a set time, and the automatic ventilation valve group is heated and activated, opening the air outlet to remove the oil fumes from the protective cover. If not, the centrifugal fan is started, and after the electromagnetic lock is continuously energized for a set time, the automatic ventilation valve group is heated and activated, opening the air outlet to remove the oil fumes from the protective cover.

[0035] The technical solution adopted by this invention to solve the fourth technical problem is: a control method for a range hood, comprising the following steps:

[0036] When the cleaning mode is activated, it checks if the electromagnetic lock temperature is higher than the set temperature. If so, it starts the centrifugal fan and runs for the set time before returning to the electromagnetic lock temperature detection step. If not, it checks if the centrifugal fan is in a stopped and locked state. If so, the smoke baffle opens to the set angle, the electromagnetic lock is directly energized, and the latch is unlocked and retracted. The operator rotates the locking knob to remove the collector. During the rotation of the locking knob, the operator should keep it away from the microswitch. The safety protection function is activated, and the fan system cannot work.

[0037] The technical solution adopted by this invention to solve the fifth technical problem is: a control method for a range hood, comprising the following steps:

[0038] The operator rotates the locking knob to install the collector. During the rotation of the locking knob, a micro switch is triggered, and the latch of the electromagnetic lock extends to form a limit engagement with the locking position of the locking knob. Then, the range hood checks whether there is anyone in front of it. If there is someone, an alarm is sounded, and the range hood will check again after a set time. If no one is in front of it, the smoke baffle will close.

[0039] Compared with the prior art, the advantages of this invention are as follows: The collector is connected to the front plate of the volute using a locking knob. When the collector needs to be installed on the front plate of the volute, simply pass the limiting rib of the locking knob through the limiting hole on the front plate of the volute and rotate it a certain angle. The limiting rib will then be limited to the rear side of the outer periphery of the limiting hole and will not come out forward from the limiting hole, thus remaining in a locked state. When the collector needs to be disassembled, turn the locking knob to the position where the limiting rib is opposite to the limiting hole. In this way, the limiting rib can come out forward from the limiting hole to achieve unlocking. The locking and unlocking method using a locking knob is more convenient for operators, the disassembly process is less strenuous, and it is less likely to loosen or come off due to fan vibration, ensuring the reliability of the connection between the collector and the front plate of the volute. In addition, the volute is equipped with a self-locking device. The position recognition device of the self-locking device can identify the rotation position of the locking knob and whether it has been rotated to the second position. When rotated to the second position, the latch of the electromagnetic lock of the self-locking device can move toward the locking position of the locking knob and form a limiting engagement with the locking position, further ensuring the reliability of the collector installation. In addition, the operator can also observe whether the latch of the electromagnetic lock has engaged with the locking position of the locking knob to identify whether the knob has been rotated to the correct position, ensuring that the collector is clearly installed in place, eliminating the anxiety and risks caused by not being able to identify whether the collector is installed in place, and improving the user experience. Attached Figure Description

[0040] Figure 1 This is a three-dimensional structural diagram of a range hood according to an embodiment of the present invention (with the locking knob in the second position);

[0041] Figure 2 This is a three-dimensional structural diagram of another state of the range hood according to an embodiment of the present invention (the locking knob is in the first position);

[0042] Figure 3 This is a three-dimensional structural diagram of the centrifugal fan and the front panel of the casing combined according to an embodiment of the present invention;

[0043] Figure 4 This is a cross-sectional view of the collector mounting structure of a centrifugal fan according to an embodiment of the present invention;

[0044] Figure 5 This is another cross-sectional view of the collector mounting structure of the centrifugal fan according to an embodiment of the present invention;

[0045] Figure 6 This is a three-dimensional structural diagram of the front side plate of the volute housing after the collector is installed (the locking knob is in the second position) according to an embodiment of the present invention.

[0046] Figure 7 This is an exploded view of the current collector mounting structure according to an embodiment of the present invention;

[0047] Figure 8 This is a three-dimensional structural diagram of a centrifugal fan according to an embodiment of the present invention. Detailed Implementation

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0049] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0050] Figures 1-8 This paper illustrates a preferred embodiment of the centrifugal fan collector mounting structure, range hood, and range hood control method of the present invention. The range hood includes a housing 7 and a centrifugal fan disposed within the housing 7. An air intake is provided on the front panel 71 of the housing 7, through which external fumes enter the housing 7. The centrifugal fan, located within the housing 7, generates negative pressure during operation, drawing external fumes into the housing 7 through the air intake. The front of the housing also features a smoke baffle 72 capable of deflecting forward and backward relative to the housing 7. The smoke baffle 72 is connected to the housing 7 via a hinge mechanism, specifically deflecting forward to open the air intake and deflecting backward to close the air intake. The hinge mechanism for driving the deflection of the smoke baffle can be a conventional hinge mechanism from the prior art, and will not be described in detail here.

[0051] The centrifugal fan includes a volute 1, an impeller 21 rotatably disposed within the volute 1, and a motor 22 for driving the impeller 21 to rotate. The volute 1 includes a front side plate 11, a rear side plate 12, and an annular wall 13 connecting the front side plate 11 and the rear side plate 12. An air inlet 110 is provided on the front side plate 11, which is opposite to the air intake of the front panel 71 of the casing 7. A collector 3 is provided at the air inlet 110 of the front side plate 11 of the volute 1. The collector 3 includes an annular guide section 31 and a connecting ring 32 extending radially outward from the guide section 31. The guide plate of the collector 3 generally includes a radial guide section 31 with an arc-shaped cross-section and an axial guide section 31 extending circumferentially from the inner side of the radial guide section 31. A filter screen 30 is also provided at the central opening of the guide section 31 of the collector 3. The connecting ring 32 of the collector 3 is a flat annular plate structure that can fit snugly against the outer periphery of the air inlet 110 on the front side plate 11 of the volute 1. To prevent air leakage, a sealing ring 34 is also provided between the rear side of the collector 3 and the front side plate 11 of the volute 1. The sealing ring 34 can be made of rubber and plastic foam strip and is bonded to the rear side of the collector 3. The thickness of the rubber and plastic foam strip is 40%-50% greater than the gap between the air inlet 110 ring and the volute 1.

[0052] See Figure 7 In this embodiment, the connecting ring 32 of the collector 3 has an outwardly extending lug 321 at its outer periphery, and a locking knob 4 is rotatably mounted on the lug 321. The locking knob 4 includes a knob body 40 and a limiting rib 44 provided on the knob body 40. The knob body 40 includes a limiting plate 42, a knob operating part 41 protruding from the front side of the limiting plate 42, and a protruding post 43 extending rearward from the rear side of the limiting plate 42, wherein the knob operating part 41 is a straight knob. The lug 321 of the connecting ring 32 has a shaft hole 3210 for the protruding post 43 to be rotatably limited therein, and the outer peripheral wall of the protruding post 43 has an annular limiting groove (not shown) for the peripheral edge of the shaft hole 3210 to be engaged therein.

[0053] A limiting spring 45 is fitted onto the protrusion 43 near its root where it connects with the limiting disc 42. In this embodiment, the limiting spring 45 can elastically extend and retract in the axial direction of the protrusion 43, and the limiting spring 45 abuts between the limiting disc 42 and the connecting ring 32. Under the action of the limiting spring 45, the axial gap in which the peripheral edge of the shaft hole 3210 of the connecting ring 32 can enter the annular limiting groove of the protrusion 43 can be effectively eliminated or compensated, thus preventing the locking knob 4 from wobbling in the axial direction. On the other hand, when the collector 3 is installed on the front side plate 11 of the volute 1, pressing the locking knob 4 slightly backward can appropriately compress the limiting spring 45, so that the limiting rib 44 can smoothly pass over the edge of the limiting hole 111 of the volute 1 and rotate. After the locking knob 4 is rotated, the front end of the limiting rib 44 abuts against the rear side of the front side wall of the volute 1 to avoid shaking and further ensure the reliability of the collector 3 installation.

[0054] The limiting rib 44 protrudes radially outward from the peripheral wall of the protruding post 43, and a certain gap is left between the front end of the limiting rib 44 and the limiting plate 42. In a preferred embodiment, the limiting rib 44 is a rib plate structure extending axially from the protruding post 43, and the dimension of the limiting rib 44 protruding outward relative to the protruding post 43 gradually increases from back to front, that is, the outer edge of the limiting rib 44 forms a guide slope, thereby facilitating the limiting rib 44 to pass through the limiting hole 111 of the front side plate 11 of the volute 1 during installation.

[0055] The front side plate 11 of the volute 1 has a through-hole 111. The limiting rib 44 of the locking knob 4 can pass through the limiting hole 111 and be limited to the rear side of the outer periphery of the limiting hole 111 after rotating a certain angle. Specifically, as the locking knob 4 rotates relative to the connecting ring 32, it has at least a locked state in which the limiting rib 44 is limited to the rear side of the outer periphery of the limiting hole 111 to prevent the limiting rib 44 from moving forward out of the limiting hole 111, and an unlocked state in which the limiting rib 44 is moved to a position opposite to the limiting hole 111 to allow the limiting rib 44 to move forward out of the limiting hole 111. The position of the locking knob 4 in the unlocked state is called the first position, and the position of the locking knob 4 in the locked state is called the second position.

[0056] The limiting plate 42 of the locking knob 4 partially protrudes from the outer peripheral edge of the connecting ring 32. The portion of the limiting plate 42 protruding from the outer peripheral edge of the connecting ring 32 has a rearwardly extending pressing support 421, which is a columnar structure. To effectively indicate that the locking knob 4 is in the locked state and further improve the installation efficiency of the collector 3, the front side plate 11 has two positioning protrusions 112 spaced circumferentially along the side wall of the locking knob 4 facing the inner wall of the volute 1. When the locking knob 4 is in the locked state, the limiting rib 44 is positioned between the two positioning protrusions 112. The distance between the two positioning protrusions 112 is adapted to the thickness of the limiting rib 44 of the locking knob 4, thereby effectively limiting the left and right swing of the limiting rib 44, allowing the locking knob 4 to be stably maintained in the locked state. The top of the aforementioned positioning protrusion 112 can adopt a smooth, outwardly convex curved surface design so that the front end of the limiting rib 44 can smoothly pass over the corresponding positioning protrusion 112 and be limited between the two positioning protrusions 112 during the rotation of the locking knob 4. The design of the positioning protrusion 112 can also provide a tactile feedback indicating that the locking knob 4 has been rotated to the correct position during rotation, thereby improving the user experience.

[0057] See Figure 8In this embodiment, the connecting ring 32 has outwardly extending pins 322 at its outer peripheral edge, and a positioning socket 113 for inserting the pins 322 is provided on the front side plate 11. The position where the pins 322 meet the connecting ring 32 is tilted backward to form a limiting step 323 (not shown). After the pins 322 of the collector 3 are installed in place, the aforementioned limiting step 323 allows the collector 3 to deflect backward around the position of the pins 322, thereby allowing the connecting ring 32 of the collector 3 to better fit against the outer side plate of the volute 1. To further ensure the secure installation of the collector 3, the collector 3 in this embodiment has two pins 322, which are located on the other side of the connecting ring 32 opposite to the locking knob.

[0058] In this embodiment, the collector 3 is connected to the front plate 11 of the volute 1 using a locking knob 4. When the collector 3 needs to be installed on the front plate 11 of the volute 1, simply pass the limiting rib 44 of the locking knob 4 through the limiting hole 111 on the front plate 11 of the volute 1 and rotate it a certain angle. The limiting rib 44 will then be limited to the rear side of the outer periphery of the limiting hole 111 and will not come out of the limiting hole 111, thus remaining in a locked state. When the collector 3 needs to be disassembled, rotate the locking knob 4 to the position where the limiting rib 44 is opposite to the limiting hole 111. In this way, the limiting rib 44 can come out of the limiting hole 111 and be unlocked. The locking and unlocking method using the locking knob 4 makes it more convenient for operators to operate, the disassembly process is less strenuous, and it is less likely to loosen or come off due to fan vibration, ensuring the reliability of the connection between the collector 3 and the front plate 11 of the volute 1.

[0059] The locking knob 4 also has a locking position 420, which is a lock opening or lock hole formed on the limiting plate 42. In this embodiment, the locking position 420 is a semi-closed lock opening. A self-locking device is also provided on the volute 1 in the area adjacent to the locking knob 4. The self-locking device includes an electromagnetic lock 51 and a position identification device electrically connected to the electromagnetic lock 51. The position identification device is used to identify the rotation position of the locking knob 4. Specifically, in order to improve the reliability of the position detection of the locking knob 4, the position identification device is a micro switch 52. When the locking knob 4 is rotated to the second position, the pressing support 421 of the locking knob 4 abuts against the sensing contact 521 of the micro switch 52, causing the micro switch 52 to be turned on. As a result, the electromagnetic lock 51 is activated, and the locking tongue 510 of the electromagnetic lock 51 moves toward the lock opening of the locking knob 4. The mechanism inserts the lever into the lock slot, thereby restricting the rotation of the locking knob 4 and further ensuring the secure installation of the collector 3. Operators can also observe (either visually or by listening to the sound of the electromagnetic lock tongue extending and retracting) whether the electromagnetic lock tongue 510 is engaged with the locking position 420 of the locking knob 4 to confirm whether the knob has rotated to the correct position. This ensures the collector 3 is properly installed, eliminating anxiety and risks caused by the inability to identify whether the collector 3 is installed correctly, and improving the user experience.

[0060] The self-locking device in this embodiment also includes a protective cover 6, which is installed inside the front side plate 11 of the fan. The electromagnetic lock 51 and the micro switch 52 are both located inside the protective cover 6. A movable opening 601 is provided on the side wall of the protective cover 6 facing the locking knob 4 to form an opening 602. A rubber seal 63 covers the movable opening 601 of the protective cover, and a movable spring 64, which fits against the rubber seal, is also provided inside the protective cover 6 at a position opposite to the movable opening 601. The sensing contact 521 of the micro switch 52 faces the movable opening 601 and contacts the movable spring 64. An arc-shaped groove 630 is provided on the side of the rubber seal 63 facing the locking knob 4, allowing the pressing support 421 of the locking knob 4 to slide and be limited therein. When the locking knob 4 is rotated to the right, it presses the movable spring 64 to move backward, and the protruding rubber seal 63 moves downward to fill the gap, ensuring that oil fumes cannot enter. In this way, the micro switch 52 can be triggered normally, the electromagnetic lock 51 is activated and then normally powered, and the locking tongue 510 moves forward to lock the knob. Considering the power consumption of the whole machine in standby mode, the electromagnetic lock 51 in this embodiment is a bistable electromagnetic lock, that is, the locking tongue 510 only needs to be powered for a moment when it moves forward or backward. No power consumption is required in other states, and it will then maintain this state. The unlocking operation of the electromagnetic lock 51 can be achieved by additional button or touch operation, or by rotating the locking knob in the opposite direction. Specifically, there is a slight circumferential gap between the locking position 420 on the locking knob and the end of the locking tongue 510 of the electromagnetic lock, which allows the locking knob 4 to rotate in the opposite direction a certain distance (in this process, it will pass the corresponding positioning protrusion 112) to achieve unlocking.

[0061] On the side wall of the protective cover 6 facing the locking knob 4, there is an opening 602 for the locking tongue 510 to pass through. Inside the protective cover 6, there is a sealing sleeve that connects to the opening 602 and fits over the locking tongue 510. Inside the sealing sleeve, there is a labyrinth-type sealing flue 60. The labyrinth-type sealing flue 60 can adopt a tortuous channel structure, which is composed of multiple continuous tortuous channels. When the gas passes through these tortuous channels, it will continuously change its flow direction. Due to the inertia of the gas, each time the direction is changed, some of the kinetic energy of the gas molecules will be converted into heat energy and lost. At the same time, the gas pressure will gradually decrease, achieving a sealing effect. Similarly, the labyrinth-type sealing flue 60 can also adopt a comb-shaped or spiral structure.

[0062] The protective cover 6 in this embodiment serves to reduce the contamination of the self-locking device components by cooking fumes. Components such as the microswitch 52 and electromagnetic lock 51 inside the protective cover 6 can be secured with screws. When the locking knob 4 is turned to the right limit, the bottom of the pressing support 421 gradually contacts the movable spring 64 at the microswitch 52. As the knob is turned clockwise, the movable spring 64 is compressed. When the locking knob 4 is locked in the second position, the compression of the movable spring 64 triggers the sensing contact 521 of the microswitch 52. The range hood controller recognizes this and powers on the electromagnetic lock 51. The locking tongue 510 of the electromagnetic lock 51 moves forward and locks against the locking knob 4, preventing it from rotating. At this point, the range hood can operate normally. If the locking knob 4 is not rotated to the correct position, it means that the collector 3 is not installed reliably and will not trigger the micro switch 52. In this state, the range hood's fan system is not powered and the impeller 21 will not rotate. This avoids the risk of the user touching the rotating impeller 21 if the collector 3 is not installed properly during disassembly.

[0063] The protective cover 6 is also connected to an air inlet pipe 61 and an air outlet pipe 62, both of which communicate with the internal space of the protective cover 6. The air outlet port 603 of the air outlet pipe 62 is located near the air inlet 110 of the volute 1 or extends into the volute 1, while the air inlet port of the air inlet pipe 61 is away from the air inlet 110. The design of the air inlet pipe 61 and the air outlet pipe 62 can also effectively replace or remove the flue gas inside the protective cover 6, and prevent oil stains from accumulating inside the protective cover 6, especially on the electromagnetic lock 51. The centrifugal fan is a single-inlet fan with air intake only on the front side. The air outlet port 603 of the air outlet pipe 62 is connected to the rear side plate 12 and communicates with the internal space of the volute 1.

[0064] The protective cover 6 has an exhaust port 603 connected to the exhaust pipe 62. Inside the protective cover 6, there is also an automatic ventilation valve assembly that opens and closes the exhaust port 603 according to temperature changes within the protective cover 6. The automatic ventilation valve assembly includes a heat-sensitive spring 66 that deforms when heated and a sealing plug 65 disposed on the heat-sensitive spring 66. The sealing plug 65 can be made of rubber, and the heat-sensitive spring 66 can be made of shape memory metal. The sealing plug 65 is opposite to the exhaust port 603. As the heat-sensitive spring 66 changes temperature, it can move the sealing plug 65 closer to the exhaust port 603 to close it, and move it away from the exhaust port 603 to open it.

[0065] The protective cover 6 is also equipped with an oil fume sensor (not shown) and a controller for detecting the concentration of oil fumes inside the protective cover 6. The oil fume sensor and the electromagnetic lock 51 are both electrically connected to the controller. The controller controls whether the electromagnetic lock 51 is continuously energized based on the oil fume signal transmitted by the oil fume sensor, thereby causing the automatic ventilation valve assembly to automatically open or close the exhaust port 603. This structural design allows the electromagnetic lock 51 to be continuously energized for a set time when oil fumes are detected inside the protective cover 6, thereby increasing the temperature inside the cavity of the protective cover 6. This triggers the automatic ventilation valve assembly to open the exhaust port 603, allowing air circulation and removing the oil fumes.

[0066] Because the electromagnetic lock 51 needs to overcome the magnetic force of its internal magnet, its power and current are relatively high. Opening the electromagnetic lock 51 only once or twice will not have an impact. However, if this function is repeatedly demonstrated, or if the user repeatedly attempts to disassemble it at home, or if the ambient temperature is high, the electromagnetic lock 51 will generate high temperatures. When the temperature reaches above 70°C, the internal coil will burn out. Therefore, in this embodiment, the centrifugal fan is located in the heat dissipation channel formed by the aforementioned air inlet pipe 61 and air outlet pipe 62. When the electromagnetic lock 51 is frequently activated, the temperature will be high. When the temperature reaches the design temperature of the shape memory metal, the shape memory metal will deform and move back, thereby causing the sealing plug 65 to move aside, thus opening the entire heat dissipation channel. Using the negative pressure generated by the fan, clean air is drawn in from the top of the range hood, then flows around the electromagnetic lock 51 to carry away heat, and is then drawn away and discharged by the fan system. Furthermore, when the heat dissipation channel is open, the cavity of the protective cover 6 containing the electromagnetic lock 51 is also treated to prevent oil fume.

[0067] A control method for a range hood includes the following steps: After the range hood is started, a self-locking device locks the hood. A fume concentration sensor inside the protective cover 6 detects the fume concentration inside the protective cover 6. If no fume is detected, the process ends, and the next detection begins after a set time. If the fume concentration is relatively low, it is determined whether the centrifugal fan is running. If so, the electromagnetic lock 51 is continuously energized for a set time, and the automatic ventilation valve assembly is activated by heat, opening the exhaust port 603 to remove the fume inside the protective cover 6. If not, after a set time, the fume concentration sensor continues to detect the fume concentration inside the protective cover 6. If the fume concentration is relatively high, it is determined whether the centrifugal fan is running. If so, the electromagnetic lock 51 is continuously energized for a set time, and the automatic ventilation valve assembly is activated by heat, opening the exhaust port 603 to remove the fume inside the protective cover 6. If not, the centrifugal fan is activated, and after the electromagnetic lock 51 is continuously energized for a set time, the automatic ventilation valve assembly is activated by heat, opening the exhaust port 603 to remove the fume inside the protective cover 6.

[0068] This invention also relates to another control method for a range hood, comprising the following steps: When the cleaning mode is activated, it is determined whether the temperature of the electromagnetic lock 51 is greater than the set temperature. If so, the centrifugal fan is activated and runs for a set time before returning to the electromagnetic lock 51 temperature detection step. If not, it is determined whether the centrifugal fan is in a stopped and locked state. If so, the smoke baffle 72 is opened to a set angle, the electromagnetic lock 51 is directly energized to unlock and retract the locking tongue 510, and the operator rotates the locking knob 4 to disassemble the collector 3. During the rotation of the locking knob 4, it moves away from the micro switch 52, the safety protection function is activated, and the fan system cannot work.

[0069] The present invention also relates to another control method for a range hood, comprising the following steps: the operator rotates the locking knob 4 to install the collector 3. During the rotation of the locking knob 4, the micro switch 52 is triggered, and the locking tongue 510 of the electromagnetic lock 51 extends to form a limit engagement with the locking position 420 of the locking knob 4. Then, the range hood detects whether there is anyone on the detection side. If there is someone, an alarm is issued and the range hood re-detects whether there is anyone after a set time. If there is no one, the smoke baffle 72 is closed.

[0070] The working process of the range hood in normal operation, disassembly / cleaning mode, and installation mode in this embodiment is as follows: When the range hood is running normally, the bistable electromagnetic lock 51 extends forward and remains in this state. Since some fumes may still escape into the sealed cavity of the protective cover 6 where the electromagnetic lock 51 is located during operation, a fume concentration sensor is installed inside. This sensor detects whether there is fume in the working environment of the electromagnetic lock 51 during range hood operation. Because the electromagnetic lock 51 is a moving part, if it becomes sticky due to prolonged exposure to fumes, it will cause the electromagnetic lock 51 to malfunction. If no fumes are detected, the detection program does not operate and restarts at the next set frequency (the detection frequency can be 3-5 minutes / time). If the fumes are small (the detection value of the fume concentration sensor is less than the first set fume concentration value), the system will again determine whether the fan is running. If the centrifugal fan is running, the electromagnetic lock 51 is continuously energized for T1 seconds, the temperature inside the protective cover 6 rises, the shape memory metal deforms, and air circulation is achieved, carrying away the fumes. If the centrifugal fan is not running, the system will wait for time Td and then jump to judge the oil fume concentration again. If a large amount of oil fume is detected (the detection value of the oil fume concentration sensor is greater than the second set oil fume concentration value), the system will determine whether the centrifugal fan is running. If it is running, the electromagnetic lock 51 will be continuously energized for T1s, which will raise the temperature inside the cavity of the protective cover 6, deform the memory metal, realize air circulation, and remove the oil fume. If it is not running, the fan will automatically start at medium speed and work with the electromagnetic lock 51 to exhaust the smoke.

[0071] The disassembly process of collector 3 is as follows: When the user needs to disassemble collector 3 for cleaning, they need to press the cleaning button on the control panel of the range hood. At this time, the system will judge the ambient temperature of the electromagnetic lock 51. If the temperature is higher than the preset threshold, the fan system will be started for heat dissipation. If the temperature does not reach the threshold, the system will lock the smoke exhaust function on the control panel, preventing it from starting temporarily. Then, it will judge whether the centrifugal fan motor 22 is still running. Because when it is running, disassembling collector 3 will expose impeller 21, which is dangerous. The control system can judge whether impeller 21 is still running by detecting the electromotive force generated when motor 22 is idling. If there is still an induced electromotive force, when impeller 21 stops, the smoke baffle 72 opens to the cleaning state, that is, opens to the horizontal position, electromagnetic lock 51 is directly energized and retracted, and impeller 21 motor 22 is de-energized. If the electromotive force is 0, smoke baffle 72 opens, electromagnetic lock 51 is directly energized and retracted, and motor 22 is de-energized. Rotate the locking knob 4 to remove it. During the rotation, the knob moves away from the micro switch 52, the safety protection is activated, and the fan system cannot work.

[0072] The installation process of collector 3 is as follows: When the locking knob 4 is rotated to the second position, it contacts the micro switch 52, powering on the fan system. The control system emits a locking warning sound for 5 seconds. After the time is up, the electromagnetic lock 51 is reverse-energized, and the locking tongue 510 extends. At this point, collector 3 is installed, and the smoke baffle 72 is in the cleaning angle state. The system will determine whether there is anyone in the movement path below the smoke baffle 72. Since some users may want to wipe the lower panel for cleaning after installation, if the infrared sensor on the smoke baffle 72 detects someone, it will emit a beeping warning sound, prompting the user to leave the closed path range of the smoke baffle 72. Then, it will determine again whether the user should leave immediately (the time can be set to 3-5 seconds). If the user moves away, the smoke baffle 72 closes, and the cleaning process ends. If not, the warning sound will turn off, the range hood light will stay on for 3 minutes, and the cleaning button indicator light will stay on, which means the cleaning and wiping mode has been triggered. Users can wipe the front panel 71 of the range hood in this state. After the time is up, it will determine again whether there is anyone in the path. If not, the process will end.

Claims

1. A collector mounting structure for a centrifugal fan, comprising: The volute (1) includes a front side plate, a rear side plate and an annular wall (13) connecting the front side plate and the rear side plate, wherein an air inlet (110) is provided on the front side plate; The collector (3) is connected to the air inlet (110) of the front side plate and includes an annular guide (31) and a connecting ring (32) extending radially outward from the guide (31). The feature is that: the connecting ring (32) is also provided with a locking knob (4), the locking knob (4) includes a knob body (40) rotatably disposed on the connecting ring (32) and a limiting rib (44) disposed on the knob body (40), the front side plate is provided with a limiting hole (111) that runs through the front and rear, the limiting rib (44) of the locking knob (4) can pass through the limiting hole (111) and can rotate and switch between a first position opposite to the limiting hole (111) and a second position misaligned with the limiting hole (111); The locking knob (4) also has a locking position (420), and the volute (1) is also provided with a self-locking device. The self-locking device includes an electromagnetic lock (51) and a position identification device electrically connected to the electromagnetic lock (51). The position identification device is used to identify the rotation position of the locking knob (4). The electromagnetic lock (51) includes a latch (510). When the position identification device identifies that the locking knob (4) is in the second position, the latch (510) can move toward the locking position (420) of the locking knob (4) and form a limiting engagement with the locking position (420).

2. The collector mounting structure for a centrifugal fan according to claim 1, characterized in that: The locking knob (4) has a pressing support (421), and the position identification device is a micro switch (52). When the locking knob (4) is rotated to the second position, the pressing support (421) of the locking knob (4) abuts against the sensing contact (521) of the micro switch (52) to turn on the micro switch (52).

3. The collector mounting structure for a centrifugal fan according to claim 2, characterized in that: The knob body (40) includes a limiting plate (42), a knob operation part (41) protruding from the front side of the limiting plate (42), and a protruding post (43) extending rearward from the rear side of the limiting plate (42). The limiting rib (44) protrudes radially outward from the peripheral wall of the protruding post (43). A portion of the limiting plate (42) is exposed outside the outer peripheral edge of the connecting ring (32). The portion of the limiting plate (42) exposed outside the outer peripheral edge of the connecting ring (32) is provided with the pressing support (421).

4. The collector mounting structure for a centrifugal fan according to claim 3, characterized in that: The self-locking device also includes a protective cover (6). The electromagnetic lock (51) and the micro switch (52) are both located inside the protective cover (6). The protective cover (6) has a movable opening (601) on one side wall facing the locking knob (4). The movable opening (601) is covered with a rubber seal (63). Inside the protective cover (6), at a position opposite to the movable opening (601), there is also a movable spring (64) that fits against the rubber seal. The sensing contact (521) of the micro switch (52) faces the movable opening (601) and is in contact with the movable spring (64).

5. The collector mounting structure for a centrifugal fan according to claim 4, characterized in that: The rubber seal (63) has an arc-shaped groove (630) on one side facing the locking knob (4) for the locking knob (4) to slide and limit the pressing support (421) therein.

6. The collector mounting structure for a centrifugal fan according to claim 4, characterized in that: The protective cover (6) has an opening (602) on one side wall facing the locking knob (4) for the locking tongue (510) to pass through. The protective cover (6) also has a sealing sleeve that connects with the opening (602) and is fitted over the locking tongue (510). The sealing sleeve has a labyrinth-type sealing flue (60).

7. The collector mounting structure for a centrifugal fan according to claim 4, characterized in that: The protective cover (6) is also connected to an air inlet pipe (61) and an air outlet pipe (62), both of which communicate with the internal space of the protective cover (6). The air outlet port (603) of the air outlet pipe (62) is located near the air inlet of the volute (1) or extends into the volute (1), while the air inlet port of the air inlet pipe (61) is far away from the air inlet.

8. The collector mounting structure for a centrifugal fan according to claim 7, characterized in that: The protective cover (6) has an air outlet port (603) connected to the air outlet pipe (62), and the protective cover (6) is also provided with an automatic air exchange valve group that can open and close the air outlet port (603) according to the temperature change inside the protective cover (6).

9. The collector mounting structure for a centrifugal fan according to claim 8, characterized in that: The automatic ventilation valve assembly includes a heat-sensitive spring (66) that can deform when heated and a sealing plug (65) disposed on the heat-sensitive spring (66). The sealing plug (65) is opposite to the air outlet (603). The heat-sensitive spring (66) can move the sealing plug (65) closer to the air outlet (603) to close the air outlet (603) and move away from the air outlet (603) to open the air outlet (603) as its heating temperature changes.

10. The collector mounting structure for a centrifugal fan according to claim 7, characterized in that: The centrifugal fan is a single-inlet fan with air intake only at the front. The air outlet port (603) of the air outlet pipe (62) is connected to the rear side plate and communicates with the internal space of the volute (1).

11. The collector mounting structure for a centrifugal fan according to claim 8, characterized in that: The protective cover (6) is also equipped with an oil fume sensor and a controller for detecting the concentration of oil fumes inside the protective cover (6). The oil fume sensor and the electromagnetic lock (51) are electrically connected to the controller. The controller controls whether the electromagnetic lock (51) is continuously energized according to the oil fume signal transmitted by the oil fume sensor, thereby causing the automatic ventilation valve group to automatically open or close the air outlet port (603).

12. The collector mounting structure for a centrifugal fan according to any one of claims 1 to 11, characterized in that: The front side plate also has two positioning protrusions (112) arranged circumferentially along the locking knob (4) on the side wall facing the volute (1). When the locking knob (4) moves to the second position, the limiting rib (44) is limited between the two positioning protrusions (112).

13. The collector mounting structure for a centrifugal fan according to any one of claims 1 to 11, characterized in that: The connecting ring (32) has outwardly extending pins (322) at its outer peripheral edge, and the front side plate has a positioning socket (113) for inserting the pins (322).

14. The collector mounting structure for a centrifugal fan according to claim 13, characterized in that: The pin (322) and the locking knob (4) are located on opposite sides of the connecting ring (32) about its axis.

15. The collector mounting structure for a centrifugal fan according to any one of claims 3 to 11, characterized in that: The locking position (420) is a lock opening or lock hole provided on the limiting plate (42), and the locking tongue (510) can be inserted into the lock opening or lock hole to restrict the rotation of the locking knob (4).

16. A range hood, comprising a housing (7) and a fan system, wherein the front side of the housing (7) is provided with a smoke baffle (72) that can be opened and closed by tilting back and forth, characterized in that: The fan system is a centrifugal fan, and the centrifugal fan includes the collector mounting structure of the centrifugal fan as described in any one of claims 8 to 15.

17. A control method for a range hood, wherein the range hood employs the collector mounting structure of the centrifugal fan as described in claim 11, characterized in that... Includes the following steps: After the range hood is started, the self-locking device locks, and the oil fume concentration sensor inside the protective cover (6) detects the oil fume concentration inside the protective cover (6). If no oil fume is detected, the process ends and the next detection is started after a set time. If the oil fume concentration is relatively low, then determine whether the centrifugal fan is running. If yes, the electromagnetic lock (51) is continuously powered on for a set time, the automatic air exchange valve group is heated and started, the air outlet port (603) is opened, and the oil fume inside the protective cover (6) is taken away. If no, after waiting for a set time, the oil fume concentration inside the protective cover (6) is detected by the oil fume concentration sensor. If a relatively high concentration of oil fumes is detected, it is then determined whether the centrifugal fan is running. If so, the electromagnetic lock (51) is continuously energized for a set time, and the automatic ventilation valve group is heated and started, opening the air outlet (603) to remove the oil fumes inside the protective cover (6). If not, the centrifugal fan is started, and after the electromagnetic lock (51) is continuously energized for a set time, the automatic ventilation valve group is heated and started, opening the air outlet (603) to remove the oil fumes inside the protective cover (6).

18. A control method for a range hood, wherein the range hood employs the collector mounting structure of the centrifugal fan as described in claim 8, characterized in that... Includes the following steps: When the cleaning mode is activated, it checks whether the temperature of the electromagnetic lock (51) is greater than the set temperature. If it is, the centrifugal fan is activated and runs for a set time before returning to the electromagnetic lock (51) temperature detection step. If not, it checks whether the centrifugal fan is in a stopped and locked state. If it is, the smoke baffle (72) is opened to the set angle, and the electromagnetic lock (51) is directly energized to unlock and retract the locking tongue (510). The operator rotates the locking knob (4) to disassemble the collector (3). During the rotation of the locking knob (4), it is kept away from the micro switch (52). The safety protection function is activated, and the fan system cannot work.

19. A control method for a range hood as described in claim 16, characterized in that... Includes the following steps: The operator rotates the locking knob (4) to install the collector (3). During the rotation of the locking knob (4), the micro switch (52) is triggered. The locking tongue (510) of the electromagnetic lock (51) extends and forms a limit engagement with the locking position (420) of the locking knob (4). Then, the range hood checks whether there is anyone in front. If there is someone, an alarm is issued and the range hood checks again after a set time. If there is no one, the smoke baffle (72) is closed.

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