Range hood with power-off protection function

Abstract

The utility model relates to a range hood with a power-off protection function, which comprises a centrifugal fan, a power-off protection device and a power-off protection device, the centrifugal fan comprises a volute and an impeller rotatably arranged in the volute, the volute is provided with an air inlet, and an air inlet ring is arranged at the air inlet of the volute; an automatic power-off switch device is further arranged on a main body of the volute, when the air inlet ring is installed on the volute in place, the automatic power-off switch device is triggered by pressing of the air inlet ring to enable the range hood to be powered on, and when the air inlet ring is separated from the volute, the automatic power-off switch device is triggered by pressing of the air inlet ring to enable the range hood to be powered off. And the air inlet ring relieves the trigger state of applying pressure to the automatic power-off switch device, so that the extractor hood is powered off. The extractor hood has the advantages that power-off protection can be carried out in time in the operation process before an operator or a user disassembles the impeller, and the electric shock condition is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a range hood with a power-off protection function. Background Art

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. It is used to quickly remove the oil smoke that is harmful to the human body during the cooking process and improve the kitchen environment. Among them, the centrifugal fan is an important component of the range hood, which includes a volute, an impeller and a motor. The volute generally includes a front cover plate, a rear cover plate and a ring wall arranged between the front cover plate and the rear cover plate. An air inlet ring is installed at the air inlet of the front cover plate. The front cover plate and the air inlet ring are generally assembled together by screw connection. Considering that the impeller needs to be cleaned regularly and the air inlet ring needs to be removed during cleaning, the air inlet ring of the existing range hood is also connected to the volute body through a quick-plug structure. For example, the Chinese invention patent application with application number CN201010576162.1 (authorization announcement number CN102478269B) discloses a structure in which the volute and the air inlet ring are connected by a rotating snap-fit ​​method. For example, the Chinese utility model patent application with application number CN202121628486.5 (authorization announcement number: CN215861006U) discloses a structure in which the volute and the air inlet ring are connected by a snap-fit ​​assembly.

[0003] At present, the disassembly and cleaning of the range hood impeller usually requires on-site professional operators, and users are not allowed to disassemble it by themselves. The main concern is that the user's improper operation may cause electric shock or mechanical contact. However, even if the professional operator does not disassemble the impeller according to the process, if the operator forgets to disconnect the main power supply or operates improperly, it may cause electric shock, which poses a major safety hazard.

[0004] Therefore, existing range hoods need further improvement. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a range hood with a power-off protection function in view of the current status of the prior art, which can timely cut off the power during the operation before the operator or user removes the impeller to avoid electric shock.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a range hood with a power-off protection function, comprising:

[0007] A centrifugal fan comprises a volute and an impeller rotatably arranged in the volute, wherein an air inlet is provided on the volute and an air inlet ring is provided at the air inlet of the volute;

[0008] An automatic power-off switch device is also provided on the main body of the volute. When the air inlet ring is installed in place on the volute, the automatic power-off switch device is triggered by the pressure of the air inlet ring to power on the range hood. When the air inlet ring is detached from the volute, the air inlet ring releases the pressure on the automatic power-off switch device to trigger the range hood and power is cut off.

[0009] As an improvement, the range hood includes a control system capable of controlling the power on and off of the entire machine, and the automatic power off switch device is electrically connected to the control system.

[0010] Taking into account the different installation methods of the air inlet ring, the installation and triggering methods of the automatic power-off switch device are also different. For the rotatably installed air inlet ring, a preferred solution is: the air inlet ring is installed on the volute by a rotating connection, and the automatic power-off switch device includes a microswitch and a lever that can rotate relative to the microswitch around a straight line parallel to the axis of the impeller, the first end of the lever is opposite to the contact of the microswitch, and the second end extends to the position of the air inlet ring. The air inlet ring can drive the lever to rotate as its rotational position on the volute changes, so that the first end of the lever triggers the contact of the microswitch and the pressure on the lever is released to make the first end of the lever move away from the contact of the microswitch.

[0011] In order to facilitate the installation of the micro switch on the volute, a first mounting bracket is provided on the volute, the micro switch is arranged on the first mounting bracket, and the shifting rod is rotatably connected to the first mounting bracket.

[0012] In order to match with the lever so that the lever can be driven to move when the belt is deflected, the outer peripheral edge of the air inlet ring has a radially concave positioning notch into which the second end of the lever can extend.

[0013] Taking into account the different installation methods of the air inlet ring, the installation and triggering methods of the automatic power-off switch device are also different. For the press-installed air inlet ring, a preferred solution is: the automatic power-off switch device includes a microswitch and an auxiliary pressure plate that can approach the contacts of the microswitch and be away from the contacts of the microswitch in a direction parallel to the impeller axis. When the air inlet ring is installed in place on the volute, the air inlet ring presses the auxiliary pressure plate against the side wall of the volute, so that the auxiliary pressure plate triggers the contacts of the microswitch. When the air inlet ring is detached from the volute, the air inlet ring releases the pressure on the auxiliary pressure plate, so that the auxiliary pressure plate is away from the contacts of the microswitch.

[0014] In order to facilitate the installation of the micro switch and the auxiliary pressure plate, a second mounting bracket is provided on the volute, the micro switch is arranged on the second mounting bracket, one end of the auxiliary pressure plate is rotatably connected to the second mounting bracket, and the other end extends to the position of the outer peripheral edge of the air inlet ring.

[0015] Taking into account that the air inlet ring is fitted against the side wall of the volute after being installed, and the microswitch itself occupies a certain space, the installation position of the microswitch on the second mounting bracket needs to be reasonably designed. The second mounting bracket is plate-shaped as a whole, and the auxiliary pressure plate is located on the front side of the second mounting bracket as a whole. The main body of the microswitch is located on the rear side of the mounting bracket. The second mounting bracket is also provided with a clearance opening at a position opposite to the contacts of the microswitch, and the auxiliary pressure plate can apply pressure to the contacts of the microswitch through the clearance opening.

[0016] In order to rotatably connect the auxiliary pressing plate to the second mounting bracket, a side portion of the second mounting bracket is provided with a bent rounded portion, and an end portion of the auxiliary pressing plate has a connecting hole for the rounded portion to pass through.

[0017] As an improvement, the volute includes a front cover plate, a rear cover plate and an annular wall connected between the front cover plate and the rear cover plate, and the automatic power-off switch device is arranged on the front cover plate or the rear cover plate.

[0018] Compared with the prior art, the utility model has the following advantages: since the volute body of the centrifugal fan is provided with an automatic power-off switch device that can cooperate with the air inlet ring, when the air inlet ring is detached from the volute, the air inlet ring will release the pressure triggering state of the automatic power-off switch device and power off the range hood, that is, an automatic power-off step is added in the disassembly process before the impeller is disassembled (that is, the process of disassembling the air inlet ring), ensuring that when the operator touches the impeller or the motor behind it, the entire range hood is without electricity and the impeller will not rotate, avoiding electric shock or other safety hazards. When the air inlet ring is installed in place on the volute, the automatic power-off switch device is triggered by the pressure of the air inlet ring, and the range hood can be powered on, which is convenient for the operator to start the machine and test it in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the range hood of Example 1 of the utility model

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of the centrifugal fan of Example 1 of the utility model;

[0021] Figure 3 This is a front view of the centrifugal fan of Example 1 of the utility model (the contact of the micro switch is in a non-triggering state);

[0022] Figure 4 This is a front view of the centrifugal fan of Example 1 of the utility model (the contact of the micro switch is in the triggered state);

[0023] Figure 5 This is a schematic diagram of the three-dimensional structure of the centrifugal fan of Example 2 of the utility model;

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the centrifugal fan of Example 2 of the utility model from another angle. DETAILED DESCRIPTION

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0027] Example 1

[0028] Figure 1-Figure 4 A preferred embodiment of a range hood with a power-off protection function of the utility model is shown. The range hood includes a casing and a centrifugal fan 1 arranged in the casing. The casing generally includes a fan frame 31 and a fume hood 32 arranged at the bottom of the fan frame 31. The inner cavity of the fan frame 31 is connected to the inner cavity of the fume hood 32. An air inlet is provided on the front side wall of the fume hood 32, and external smoke can enter the fume hood 32 through the air inlet. The centrifugal fan 1 is arranged in the fan frame 31. When the centrifugal fan 1 is running, negative pressure is generated, and external oil smoke can be sucked into the fume hood 32 through the air inlet. An oil net is also provided at the air inlet of the fume hood 32 for filtering oil smoke. An oil cup is provided at the bottom of the fume hood 32. The oil cup is in the shape of a long strip extending left and right, and is used to receive oil stains flowing down from the fume hood 32.

[0029] The centrifugal fan 1 includes a volute 10, an impeller disposed in the volute 10, and a motor for driving the impeller to rotate. The volute 10 includes a front cover plate 11, a rear cover plate 12, and a ring wall 13 connected between the front cover plate 11 and the rear cover plate 12. Air inlets are provided on the front cover plate 11 and the rear cover plate 12, wherein the air inlet on the front cover plate 11 is a main air inlet, and an air inlet ring 14 is also installed at the main air inlet. In this embodiment, the air inlet ring 14 is installed on the front cover plate 11 by a rotational connection (such as a conventional rotational clamping).

[0030] The front cover plate 11 of the volute 10 of this embodiment is also provided with an automatic power-off switch device. The automatic power-off switch device comprises a first mounting bracket 22, a micro switch 21 and a lever 24. The first mounting bracket 22 is in the shape of a plate and is attached to the wall surface of the front cover plate 11. The micro switch 21 is arranged on the first mounting bracket 22, and the lever 24 is rotatably connected to the first mounting bracket through a pin 240. The extension direction of the pin 240 is substantially parallel to the axis of the impeller, that is, the rotation axis direction of the lever 24 is substantially parallel to the axis of the impeller. The first end of the lever 24 is opposite to the contact 210 of the micro switch 21, and the second end extends to the position of the air inlet ring 14. In order to match the lever 24, the outer peripheral edge of the air inlet ring 14 has a radially concave positioning notch 140 into which the second end of the lever 24 can extend. The micro switch 21 of the automatic power-off switch device is electrically connected to the control system of the range hood.

[0031] See also Figure 2 and Figure 3 Before removing the impeller, the operator first removes the air inlet ring 14, specifically, rotates the air inlet ring 14 counterclockwise to separate from the volute 10. At this time, the air inlet ring 14 has no downward rotation force on the lever 24, so that the first end of the lever 24 will not press the contact 210 of the micro switch 21, and the micro switch 21 is in an off state, so that the entire range hood is powered off. When installing the air inlet ring 14, the air inlet ring 14 will be rotated clockwise, and the positioning notch 140 of the air inlet ring 14 will contact the lever 24 and drive the lever 24 to rotate. After the air inlet ring 14 is installed in place, the lever 24 remains in a state of applying pressure to the contact 210 of the micro switch 21, and the micro switch 21 is in a triggered state, so that the entire range hood is powered on.

[0032] Since the main body of the volute 10 of the centrifugal fan 1 is provided with an automatic power-off switch device that can cooperate with the air inlet ring 14, when the air inlet ring 14 is detached from the volute 10, the air inlet ring 14 will release the pressure triggering state of the automatic power-off switch device and power off the range hood, that is, an automatic power-off step is added in the disassembly process before the impeller removal action (that is, the process of disassembling the air inlet ring 14), ensuring that when the operator touches the impeller or the motor behind, the entire range hood is without electricity and the impeller will not rotate, avoiding electric shock or other safety hazards. When the air inlet ring 14 is installed in place on the volute 10, the automatic power-off switch device is triggered by the pressure of the air inlet ring 14, and the range hood can be powered, which is convenient for the operator to start the machine and test it in time.

[0033] Example 2

[0034] Figure 5 and Figure 6 Another preferred embodiment of the range hood with power-off protection function of the utility model is shown. The difference between this embodiment and embodiment 1 is that the installation and triggering methods of the automatic power-off switch device are different. In this embodiment, the air inlet ring 14 is installed on the volute 10 by pressing and connecting, such as being connected to the volute 10 by screw fixation or snap assembly fixation, and of course, it can also be connected by rotation. For example, a stepped screw 15 is provided on the front cover plate 11 of the volute 10. When installing the air inlet ring 14, first use the large hole 141 of the air inlet ring 14 to face the stepped screw 15, then press it, and then rotate the air inlet ring 14 clockwise so that the small hole 142 of the air inlet ring 14 is stuck with the stepped screw 15.

[0035] The automatic power-off switch device includes a second mounting bracket 23, a micro switch 21, and an auxiliary pressing plate 25 that can approach the contact 210 of the micro switch 21 in a direction parallel to the impeller axis and is away from the contact 210 of the micro switch 21. The second mounting bracket 23 includes a mounting plate 231 and a bent plate 232 bent toward the rear side from the mounting plate 231. The mounting plate 231 is fitted on the front cover plate 11 of the volute 10, and a part of it extends outside the annular wall 13 of the volute 10, and the bent plate 232 is connected to the extended part of the mounting plate 231 and is also located on the outer side of the annular wall 13 of the volute 10. The micro switch 21 is arranged on the bent plate 232 and is located at the rear side of the second mounting bracket 23. Specifically, the contact 210 of the micro switch 21 faces the rear side of the mounting plate 231, and the mounting plate 231 of the second mounting bracket 23 is further provided with a clearance opening 2310 at a position opposite to the contact 210 of the micro switch 21, through which the contact 210 of the micro switch 21 can be exposed, so that the auxiliary pressing plate 25 can apply pressure to the contact 210 of the micro switch 21. The auxiliary pressing plate 25 is located at the front side of the mounting plate 231 of the second mounting bracket 23 as a whole, and specifically, a bent curling portion 231 is provided at the side of the portion of the mounting plate 231 extending outside the annular wall 13 of the volute 10, and one end of the auxiliary pressing plate 25 has a connecting hole 250 for the curling portion 231 to pass through, so that the auxiliary pressing plate 25 can approach and apply pressure to the contact 210 of the micro switch 21 and move away from the contact 210 of the micro switch 21 to release the pressure state during the process of the auxiliary pressing plate 25 deflecting forward and backward relative to the first mounting bracket 22. The auxiliary pressing plate 25 can apply pressure to the contact 210 of the micro switch 21 through the clearance opening 2310 .

[0036] When the air inlet ring 14 is installed in place on the volute 10, the air inlet ring 14 presses the auxiliary pressure plate 25 against the side wall of the volute 10, so that the auxiliary pressure plate 25 triggers the contact 210 of the micro switch 21. When the air inlet ring 14 is detached from the volute 10, the air inlet ring 14 releases the pressure on the auxiliary pressure plate 25, so that the auxiliary pressure plate 25 is away from the contact 210 of the micro switch 21.

[0037] When the air inlet ring 14 is installed, the auxiliary pressure plate 25 is pressed down, thereby triggering the micro switch 21 to ensure that the whole machine is powered on. When the air inlet ring 14 is removed, the auxiliary pressure plate 25 is lifted up by the spring force of the micro switch 21, the micro switch 21 is powered off, and the whole machine is powered off, which can ensure that there is no mechanical and electric shock risk when the operator touches the impeller.

Claims

1. A range hood with a power-off protection function, comprising: A centrifugal fan (1) comprises a volute (10) and an impeller rotatably arranged in the volute (10), wherein the volute (10) is provided with an air inlet and an air inlet ring (14) is provided at the air inlet of the volute (10); The invention is characterized in that an automatic power-off switch device is also provided on the main body of the volute (10); when the air inlet ring (14) is installed in place on the volute (10), the automatic power-off switch device is triggered by the pressure of the air inlet ring (14) to power on the range hood; when the air inlet ring (14) is detached from the volute (10), the air inlet ring (14) releases the pressure on the automatic power-off switch device to power off the range hood.

2. The range hood with power-off protection function according to claim 1, characterized in that: The range hood comprises a control system capable of controlling the power on and off of the entire machine, and the automatic power off switch device is electrically connected to the control system.

3. The range hood with power-off protection function according to claim 1 or 2, characterized in that: The air inlet ring (14) is mounted on the volute (10) by means of a rotational connection. The automatic power-off switch device comprises a micro switch (21) and a lever (24) which can rotate relative to the micro switch (21) around a straight line parallel to the axis of the impeller. The first end of the lever (24) is opposite to the contact (210) of the micro switch (21), and the second end extends to the position where the air inlet ring (14) is located. The air inlet ring (14) can drive the lever (24) to rotate as its rotational position on the volute (10) changes, so that the first end of the lever (24) triggers the contact (210) of the micro switch (21) and releases the pressure on the lever (24) so ​​that the first end of the lever (24) is away from the contact (210) of the micro switch (21).

4. The range hood with power-off protection function according to claim 3, characterized in that: A first mounting bracket (22) is provided on the volute (10), the micro switch (21) is provided on the first mounting bracket (22), and the shifting rod (24) is rotatably connected to the first mounting bracket (22).

5. The range hood with power-off protection function according to claim 4, characterized in that: The outer peripheral edge of the air inlet ring (14) has a radially inwardly concave positioning notch (140) into which the second end of the lever (24) can extend.

6. The range hood with power-off protection function according to claim 1 or 2, characterized in that: The automatic power-off switch device comprises a micro switch (21) and an auxiliary pressure plate (25) which can approach a contact (210) of the micro switch (21) in a direction parallel to the impeller axis and is away from the contact (210) of the micro switch (21). When the air inlet ring (14) is installed in place on the volute (10), the air inlet ring (14) presses the auxiliary pressure plate (25) against the side wall of the volute (10), so that the auxiliary pressure plate (25) triggers the contact (210) of the micro switch (21). When the air inlet ring (14) is detached from the volute (10), the air inlet ring (14) releases the pressure on the auxiliary pressure plate (25), so that the auxiliary pressure plate (25) is away from the contact (210) of the micro switch (21).

7. The range hood with power-off protection function according to claim 6, characterized in that: A second mounting bracket (23) is provided on the volute (10), the micro switch (21) is provided on the second mounting bracket (23), one end of the auxiliary pressure plate (25) is rotatably connected to the second mounting bracket (23), and the other end extends to the position of the outer peripheral edge of the air inlet ring (14).

8. The range hood with power-off protection function according to claim 7, characterized in that: The second mounting bracket (23) is in the shape of a plate as a whole, the auxiliary pressure plate (25) is located on the front side of the second mounting bracket (23) as a whole, the main body of the micro switch (21) is located on the rear side of the mounting bracket, and the second mounting bracket (23) is also provided with a clearance opening (2310) at a position opposite to the contact (210) of the micro switch (21), and the auxiliary pressure plate (25) can apply pressure to the contact (210) of the micro switch (21) through the clearance opening (2310).

9. The range hood with power-off protection function according to claim 7, characterized in that: A bent rounded portion (231) is provided on the side of the second mounting bracket (23), and a connecting hole (250) is provided at the end of the auxiliary pressing plate (25) for the rounded portion (231) to pass through.

10. The range hood with power-off protection function according to claim 1, characterized in that: The volute (10) comprises a front cover plate (11), a rear cover plate (12) and an annular wall (13) connected between the front cover plate (11) and the rear cover plate (12); the automatic power-off switch device is arranged on the front cover plate (11) or the rear cover plate (12).

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