Check valve for range hood and range hood

Abstract

The utility model relates to a check valve for a range hood and the range hood. The valve plate assembly comprises a mounting shaft rotationally arranged on the shell and a valve plate arranged on the mounting shaft; a power output shaft of the driving device is connected with the mounting shaft so as to drive the mounting shaft to rotate; the power output shaft is connected with the mounting shaft through a limiting pin shaft, and the limiting pin shaft has a first state in which torque can be transmitted between the power output shaft and the mounting shaft to realize linkage and a second state in which the linkage between the power output shaft and the mounting shaft is released along with the change of the moving position of the limiting pin shaft; the valve further comprises a first thermal deformation assembly, an elastic bias component and a second thermal deformation assembly. The second thermal deformation assembly has a limiting state for limiting the elastic bias component to move towards the valve plate assembly and a non-limiting state for deforming under the heating condition to relieve limiting of the elastic bias component. The emergency valve has the advantages that the linkage between the valve plate and the power output shaft of the driving device can be cut off in time in case of emergency, and the valve plate can be closed in time.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a check valve for range hoods and the range hood. Background Art

[0002] In the prior art, the valve plate of the anti-return air check valve is mostly opened passively. When closed, the valve plate is kept closed by its own gravity. When opened, it is blown open by the exhaust air pressure of the range hood, so that the oil smoke is discharged to the public flue or outdoors. This anti-return air check valve is sometimes not closed tightly, causing smoke and odor to flow through; and when opened, the valve plate is opened by the exhaust air pressure of the range hood, causing a certain amount of air volume loss.

[0003] To this end, the Chinese utility model patent application with application number CN201420866618.1 (authorization announcement number: CN204459320U) discloses an electrically controlled anti-return air check valve, including a check valve base, a check valve main part and an air duct kit, one end of the check valve main part is connected to the check valve base in a positioning and matching manner, and the other end of the check valve main part is connected to the air duct kit to form a ventilation channel; a motor seat is provided on the check valve main part, the motor shaft of the motor is connected to one end of the crankshaft, the other end of the crankshaft is matched and connected to one end of the rotating shaft assembly, and the other end of the rotating shaft assembly and one end of the rotating shaft assembly are both plane connecting member structures. During use, according to the switch status of the range hood, the valve plate automatically opens and closes, which effectively avoids the pressure loss of the range hood during the oil fume exhaust process, and also significantly improves the oil fume extraction efficiency. At the same time, the electrically controlled anti-return air check valve automatically adjusts the valve plate opening angle according to the start-up status of the range hood, reflecting the intelligence of the entire product.

[0004] However, the electrically controlled check valve in the above patent application still has certain shortcomings. The electrically controlled check valve cannot be operated without an electrical signal. After power failure, the electrically controlled valve plate and the output shaft of the motor are in a locked state, and the valve plate cannot be smoothly closed even when driven by an external force. Since multiple users share a common longitudinal flue, once a fire occurs in one of them, a large amount of high-temperature harmful gases will flow into the common longitudinal flue. At this time, if the valve plate in the flue check valve is not closed in time, these large amounts of high-temperature harmful gases will enter the home of the user who is using the range hood through the fume channel of the flue check valve, thereby threatening the life safety of the residents.

[0005] Therefore, the existing check valve for range hoods needs further improvement. Utility Model Content

[0006] The first technical problem to be solved by the utility model is to provide a check valve for a range hood that can promptly disconnect the linkage between the valve plate and the power output shaft of the driving device and close the valve plate in time in an emergency in view of the current status of the prior art.

[0007] The second technical problem to be solved by the present invention is to provide a range hood using the above-mentioned check valve in view of the current status of the prior art.

[0008] The technical solution adopted by the utility model to solve the first technical problem is: a check valve for a range hood, comprising:

[0009] A housing having a smoke passage formed therein;

[0010] The valve plate assembly comprises a mounting shaft rotatably arranged on the housing and a valve plate arranged on the mounting shaft and capable of opening and closing the smoke passage as the mounting shaft rotates;

[0011] A driving device having a power output shaft connected to the installation shaft to drive the installation shaft to rotate;

[0012] The power output shaft and the mounting shaft are connected by a limit pin which is radially movable and penetrates the two shafts. The limit pin has a first state in which the torque can be transmitted between the two shafts to realize linkage and a second state in which the linkage between the power output shaft and the mounting shaft is released as its moving position changes.

[0013] It also includes a first thermal deformation component that can drive the limit pin to move from the first state to the second state under heat conditions, and the heat sensing end of the first thermal deformation component is located in the smoke channel of the shell;

[0014] It also includes an elastic biasing component and a second thermal deformation component, the elastic biasing component having a power action end that can move toward the valve plate assembly to act on the mounting shaft or the valve plate to cause it to rotate, the second thermal deformation component is arranged on the outer shell, and has a limiting state that limits the movement of the elastic biasing component toward the valve plate assembly, and a non-limiting state that deforms under heat conditions to release the limitation on the elastic biasing component and allow the elastic biasing component to move toward the valve plate assembly to drive the valve plate to rotate and close the smoke channel.

[0015] In order to simplify the matching structure between the elastic biasing member and the valve plate assembly, the elastic biasing member includes a strip spring sheet arranged in the outer shell, a first end of the strip spring sheet is fixed on the inner wall of the outer shell, and the other end is limited by the second thermal deformation assembly to be away from the valve plate, and always has a tendency to move toward the valve plate assembly and act on the valve plate to cause the valve plate to close the smoke channel.

[0016] In order to achieve effective limiting of the strip spring piece by the second thermal deformation component and release the limiting after reaching a certain heating condition, the second thermal deformation component is arranged in the smoke passage of the shell, and includes a first temperature-sensitive sheet and a second temperature-sensitive sheet, the first end of the first temperature-sensitive sheet is fixed to the shell, and the second end is bonded to the second temperature-sensitive sheet to form a first limit stop for limiting the strip spring piece from sliding off the second end of the first temperature-sensitive sheet. When a fire occurs, the first temperature-sensitive sheet and the second temperature-sensitive sheet will be separated when the bonding point is heated to a certain temperature (such as: 110±5℃), the second temperature-sensitive sheet will fall off from the second end of the first temperature-sensitive sheet, and the main body of the strip spring piece will slide off from the second end of the first temperature-sensitive sheet, and drive the valve sheet to rotate and close the smoke passage in the process of restoring the original state.

[0017] As another feasible solution, the elastic biasing member can be arranged outside the main body of the housing, and realize the rotation and closing of the valve plate by acting on the mounting shaft. Specifically, the outer part of the housing is also provided with a placement shell for accommodating the driving device, the end of the mounting shaft extends into the placement shell and is connected to the power output shaft of the driving device, and the end of the mounting shaft is also provided with a radially extending swing arm;

[0018] The elastic biasing member includes a tension spring arranged in the housing shell, two ends of the tension spring are fixed relative to the housing shell, and the main body of the tension spring is limited by the second thermal deformation component and is away from the swing arm and maintained in a stretched state. After the second thermal deformation component is thermally deformed to release the limitation on the tension spring, the tension spring moves toward the swing arm and acts on the swing arm, driving the mounting shaft to rotate so that the valve plate closes the smoke channel.

[0019] In order to reasonably fix the tension spring and enable the tension spring to effectively drive the mounting shaft to deflect after the limit is released, a mounting plate for fixing the driving device is provided in the mounting shell, and the mounting plate is perpendicular to the axis of the mounting shaft. Both ends of the tension spring are fixed on a side wall of the mounting plate facing the mounting shaft, and the swing arm of the mounting shaft is also provided with an extension column extending toward the mounting plate at the end position away from the mounting shaft. After the second thermal deformation component is thermally deformed to release the limit on the tension spring, the tension spring acts on the extension column and drives the mounting shaft to rotate around its own axis.

[0020] In order to achieve effective limiting of the strip spring piece by the second thermal deformation component and release the limiting after reaching certain heating conditions, the second thermal deformation component is arranged in the housing shell and includes a third temperature-sensitive sheet and a fourth temperature-sensitive sheet. The first end of the third temperature-sensitive sheet is fixed to the mounting plate, and the second end is bonded to the fourth temperature-sensitive sheet to form a second limiting stop for limiting the tension spring from sliding off the second end of the third temperature-sensitive sheet.

[0021] When a fire occurs, the third temperature-sensitive sheet and the fourth temperature-sensitive sheet will separate when the bonding point is heated to a certain temperature (e.g., 110±5°C). After the fourth temperature-sensitive sheet separates from the second end of the third temperature-sensitive sheet, the tension spring will also slide off from the second end of the third temperature-sensitive sheet. In the process of the tension spring returning to its original state, it drives the mounting shaft to deflect, thereby driving the valve sheet to close.

[0022] In order to accommodate the above-mentioned limit pin, one of the power output shaft and the mounting shaft is provided with an axially extending mounting hole and a first radial hole radially opened and connected with the mounting hole, and the other has a mounting end extending into the mounting hole, and the mounting end has a second radial hole radially opened and connected with the first radial hole. The limit pin is movably penetrated in the first radial hole and / or the second radial channel. When the limit pin is in the first state, the limit pin is simultaneously penetrated in the first radial hole and the second radial channel. When the limit pin is in the second state, the limit pin moves out of the second radial hole and enters the first radial hole.

[0023] In order to enable the limit pin to smoothly switch to the second state under the action of the thermal deformation component, the installation channel is provided on the installation shaft, and the end of the power output shaft corresponding to the end extending into the installation channel constitutes the installation end, and an elastic member is also provided in the second radial channel of the power output shaft, and the elastic member acts on the inner end of the limit pin and makes the limit pin always have a tendency to move from the second radial channel to the first radial channel;

[0024] The outer peripheral wall of the mounting shaft is also provided with a heat-deformable spring sheet that is deformed after being heated. The heat-deformable spring sheet blocks the port of the first radial channel and abuts against the outer end of the limit pin. A portion of the heat-deformable spring sheet extends into the smoke passage of the housing. After being deformed by heat, the heat-deformable spring sheet is away from the port of the first radial channel to allow the limit pin to move out of the second radial channel.

[0025] The elastic member and the thermally deformable spring sheet together constitute the first thermally deformable component.

[0026] The elastic member may adopt various existing technologies and may include various elastic elements such as compression springs, torsion springs, and spring leaves. However, in order to better cooperate with the limit pin, the elastic member is a compression spring arranged in the second radial channel.

[0027] In order to limit the rotation angle of the valve plate so that it can accurately rotate to a fully open state or a closed state, the mounting shaft is also provided with a radially extending swing arm that can rotate with the mounting shaft, and the outer shell is also provided with a mounting plate, which has a first limiting rib and a second limiting rib for limiting the rotation angle of the swing arm. When the valve plate is in a state of closing the smoke channel, the swing arm abuts against the first limiting rib, and when the valve plate is in a state of opening the smoke channel, the swing arm abuts against the second limiting rib.

[0028] The technical solution adopted by the utility model to solve the second technical problem is: a range hood, comprising a body, wherein a check valve is provided at the air outlet of the body, and the check valve adopts the above-mentioned check valve for range hoods.

[0029] Compared with the prior art, the advantages of the utility model are as follows: when a fire occurs, the first thermal deformation component is heated to drive the pin shaft to move from the position of the first state to the position of the second state, that is, the linkage state between the power output shaft of the driving device and the mounting shaft can be released in time, thereby allowing the rotating valve plate to rotate freely. On this basis, the second thermal deformation component is also heated to release the limit on the elastic biasing member, and the elastic biasing member can automatically move toward the valve plate assembly, driving the mounting shaft or the valve plate to rotate, thereby closing the smoke channel and achieving the purpose of blocking smoke and fire prevention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of the check valve of Example 1 of the utility model;

[0031] Figure 2 It is a schematic diagram of the three-dimensional structure of the housing cover of the check valve of Example 1 of the utility model after being disassembled;

[0032] Figure 3 It is a sectional stereoscopic view of the check valve of Example 1 of the utility model cut along the axis of the installation shaft (the limit pin is in the first state);

[0033] Figure 4 It is a cross-sectional view of the check valve of Example 1 of the utility model cut along the axis of the installation shaft (the limit pin is in the second state);

[0034] Figure 5 It is a three-dimensional structural schematic diagram of the check valve of Example 1 of the utility model from another angle (the valve plate is in a closed state);

[0035] Figure 6 It is a three-dimensional structural schematic diagram of the check valve of Example 1 of the utility model from another angle (the valve plate is in an open state);

[0036] Figure 7 This is an exploded view of the check valve of Example 1 of the utility model;

[0037] Figure 8 This is a schematic diagram of the three-dimensional structure of the check valve of Example 2 of the utility model without the outer shell. DETAILED DESCRIPTION

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] 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.

[0040] Example 1

[0041] Figure 1-Figure 7 The preferred embodiment of a check valve for a range hood of the utility model is shown. A check valve for a range hood is used to be installed at the air outlet of the range hood body. The check valve comprises a housing 1, a valve plate assembly, a limit pin, a first thermal deformation assembly, an elastic biasing member, a second thermal deformation assembly and a driving device.

[0042] The housing 1 is tubular in shape as a whole, and a smoke passage 10 is formed inside the housing. The smoke passage 10 has an air inlet 11 and an air outlet 12 that are relatively arranged. The air inlet 11 can be connected to the air outlet 12 of the machine body through a smoke exhaust pipe.

[0043] The housing 1 is provided with a radially arranged mounting shaft 3 and a valve plate 14 arranged on the mounting shaft 3 and rotating with the mounting shaft 3. The valve plate 14 can open and close the smoke passage 10 as its rotation position changes. There are two mounting shafts 3 in this embodiment. The peripheral wall of the housing 1 is provided with two radially opposite openings 13. The two mounting shafts 3 are rotatably mounted in the two openings 13 respectively. The two mounting shafts 3 extend on the same straight line, and the two radially opposite sides of the valve plate 14 are connected to the two mounting shafts 3 by screws. One of the mounting shafts 3 is used to be connected to the power output shaft of the driving device, and the other mounting shaft 3 passes through the opening 13 of the housing 1 and is exposed relative to the outer wall of the housing 1. The exposed part forms a straight-line operating knob 34 for the user to manually rotate the mounting shaft 3 and the valve plate 14.

[0044] See also Figure 2The driving device of this embodiment includes a driving motor 2 arranged on the housing 1 and a gear speed transmission mechanism (not shown) connected to the output shaft of the driving motor. The power input end of the gear speed transmission mechanism is connected to the output shaft of the driving motor 2, and the power output end constitutes the power output shaft 20 of the driving device. The power output shaft 20 of the driving device is connected to one of the mounting shafts 3, thereby driving the mounting shaft 3 and the valve plate 14 to rotate around the axis of the mounting shaft 3. In order to facilitate the installation of the above-mentioned driving motor 2 and the gear speed transmission mechanism and other components, a placement shell 15 with a placement chamber is provided on the outer side of the peripheral wall of the housing 1. The placement shell 15 includes a shell body 151 designed as a whole with the main body of the housing 1 and a cover body 152 covering the open part of the shell body 151. A mounting plate 16 is also provided in the placement shell 15. The mounting plate 16 can be used to fix the driving motor 2 and the gear speed transmission mechanism. Specifically, the extension direction of the power output shaft 20 of the driving device is substantially perpendicular to the mounting plate 16, and passes through the mounting plate 16 and is exposed on the side of the mounting plate 16 away from the driving motor.

[0045] The end of the installation shaft 3 connected to the driving device extends into the placement shell 15. The end is provided with a radially extending swing arm 33 that can rotate with the installation shaft 3. The swing arm 33 of this embodiment is designed as an integral whole with the installation shaft 3. The side wall of the mounting plate 16 in the housing shell 15 is provided with a first limiting rib 161 and a second limiting rib 162 for limiting the rotation angle of the swing arm 33. The angle formed by the first limiting rib 161 and the second limiting rib 162 relative to the axis of the mounting shaft 3 is basically 90°, which is consistent with the angle between the valve plate 14 in the open smoke channel 10 and the closed smoke channel 10. When the valve plate 14 is in the closed smoke channel 10 state, the swing arm 33 abuts against the first limiting rib 161, and when the valve plate 14 is in the open smoke channel 10 state, the swing arm 33 abuts against the second limiting rib 162. After the above-mentioned first limiting rib 161 and the second limiting rib 162 are provided, the rotation angle of the valve plate 14 can be limited (especially when the angle of the valve plate 14 is manually adjusted), so that it can be accurately rotated to a fully open state or a closed state, thereby improving the operating feel.

[0046] The inner peripheral wall of the housing 1 is also provided with a third limiting rib 100 extending inwardly to limit the rotation of the valve plate 14. The third limiting rib 100 of this embodiment is a strip-shaped convex rib protruding inwardly from the inner wall surface of the housing 1 and extending along the circumference of the housing 1. When the valve plate 14 is in a state of closing the smoke channel 10, the outer peripheral edge of the valve plate 14 abuts against the third limiting rib 100, thereby making it possible for the valve plate 14 to be stably maintained in a closed state.

[0047] See also Figure 3 and Figure 4The power output shaft 20 of the driving device of this embodiment is connected to the mounting shaft 3 through a limit pin 4 that is radially movable and penetrates the two. Specifically, an axially extending mounting hole 31 is provided on the end of the mounting shaft 3, and a first radial hole 32 that is radially opened on the outer peripheral wall and is connected to the mounting hole 31 is provided.

[0048] The power output shaft 20 of the driving device has a mounting end 21 extending into the mounting hole 31, and the mounting end 21 has a second radial hole 22 opened radially, and the second radial hole 22 is correspondingly connected to the first radial hole 32 of the mounting shaft 3, and the two extend on the same radial straight line. The stop pin 4 is axially movable and penetrates the first radial hole 32 and / or the second radial channel. Specifically, the stop pin 4 has a first state in which the torque can be transmitted between the mounting shaft 3 and the power output shaft 20 of the driving device to achieve linkage, and a second state in which the linkage between the power output shaft 20 and the mounting shaft 3 is released as its moving position changes. More specifically, when the stop pin 4 is in the first state, the stop pin 4 is simultaneously located in the first radial hole 32 and the second radial channel. When the stop pin 4 is in the second state, the stop pin 4 moves out of the second radial hole 22 and enters the first radial hole 32.

[0049] The second radial channel 22 of the power output shaft 20 of the present embodiment is also provided with an elastic member 51, wherein the elastic member 51 is preferably a compression spring. The compression spring abuts against the inner end of the limit pin 4, so that the limit pin 4 always has a tendency to move from the second radial channel 22 to the first radial channel 32. The outer peripheral wall of the installation shaft 3 of the present embodiment is also provided with a heat-deformable spring piece 52 that deforms after being heated. The heat-deformable spring piece 52 is in a relatively bent shape in a natural state, which blocks the port of the first radial channel 32 and abuts against the outer end of the limit pin 4. The heat-deformable spring piece 52 of the present embodiment is in the shape of a long strip as a whole, and a section thereof (that is, the heat-sensing end) extends into the smoke channel 10 of the outer shell 1, and is fixed to the installation shaft 3 by a screw 53. After the thermal deformation spring piece 52 is deformed by heat, the change is relatively straight, that is, it will be away from the end of the first radial channel 32. In this case, the thermal deformation spring piece 52 releases the radial limit of the limit pin 4, and the limit pin 4 moves out of the second radial channel 22 under the elastic force of the compression spring, that is, it is in the above-mentioned second state, and the linkage between the installation shaft 3 and the power output shaft 20 of the driving device is released. In this state, the installation shaft 3 and the valve plate 14 can rotate freely. The above-mentioned elastic member 51 and the thermal deformation spring piece 52 together constitute the thermal deformation component of this embodiment.

[0050] When a fire occurs, the heat-deformable component is heated to drive the pin shaft to move from the first state position to the second state position, that is, the linkage state between the power output shaft 20 and the mounting shaft 3 can be released in time, thereby allowing the valve plate 14 to rotate freely. In this way, it is ensured that the valve plate 14 can rotate to close the air inlet 11 of the smoke channel under other driving modes, thereby achieving the purpose of blocking smoke and preventing fire.

[0051] The elastic biasing member of the present embodiment is a strip spring piece 61, one end of which is fixed to the inner wall of the outer shell 1, and is limited by a second thermal deformation component which is also arranged on the inner wall of the outer shell 1. When the strip spring piece 61 is in the limited state, the strip spring piece 61 is away from the valve plate 14, thereby not causing interference with the rotation process of the valve plate 14 (the rotation process of opening the smoke channel 10 and closing the smoke channel 10). The second thermal deformation component of the present embodiment includes a first temperature-sensitive piece 621 and a second temperature-sensitive piece 622. The first end of the first temperature-sensitive piece 621 is fixed to the inner wall of the outer shell 1, and the second temperature-sensitive piece 622 is L-shaped as a whole. The second temperature-sensitive piece 622 is bonded to the second end of the first temperature-sensitive piece 621, and forms a first limit stop for limiting the strip spring piece 61 from sliding off the second end of the first temperature-sensitive piece 621. Figure 5 The figure shows the limiting state of the second thermal deformation component limiting the elastic biasing member to move toward the valve plate 14 component. When a fire occurs, the first temperature-sensitive sheet 621 and the second temperature-sensitive sheet 622 will be separated when the bonding point is heated to a certain temperature (such as: 110±5℃), that is, the second temperature-sensitive sheet 622 will fall off from the second end of the first temperature-sensitive sheet 621, so that the main body of the strip spring sheet 61 will slide off from the second end of the first temperature-sensitive sheet 621, and in the process of restoring the original state (releasing elastic potential energy), the second end of the strip spring sheet 61 drives the valve plate 14 to rotate and close. The second end of the second temperature-sensitive sheet 622 constitutes the power action end of the second thermal deformation component.

[0052] When a fire occurs, the first thermal deformation component is heated to drive the pin shaft to move from the position of the first state to the position of the second state, that is, the linkage state between the power output shaft 20 and the mounting shaft 3 can be released in time, thereby allowing the rotating valve plate 14 to rotate freely. On this basis, the second thermal deformation component is also heated to release the limit on the elastic biasing member, and the elastic biasing member can automatically move toward the valve plate 14 assembly, driving the mounting shaft 3 or the valve plate 14 to rotate, thereby closing the smoke channel 10, thereby achieving the purpose of blocking smoke and fire prevention.

[0053] The present embodiment also relates to a range hood, comprising a machine body, wherein the above-mentioned check valve is provided at the air outlet of the machine body.

[0054] Example 2

[0055] Figure 8Another preferred embodiment of a check valve for a range hood of the utility model is shown. The difference between this embodiment and embodiment 1 is that the elastic biasing member and the second thermal deformation component for limiting the movement of the elastic biasing member are different. Specifically, the elastic biasing member of this embodiment is a tension spring 71, and the two ends of the tension spring 71 are fixed to the side wall of the mounting plate 16 of the housing 15 facing the mounting shaft 3 by screws. The swing arm 33 of the mounting shaft 3 is also provided with an extension column 330 extending toward the mounting plate 16 at the end position away from the main body of the mounting shaft 3. After a section in the middle of the tension spring 71 can be stretched to a certain extent along the extension direction parallel to the mounting plate 16 toward the side away from the mounting shaft 3, it can be limited by the corresponding second thermal deformation component provided on the mounting plate 16. In this state, the tension spring 71 forms a triangular space as a whole, which will not cause interference problems in the rotation process of the valve plate 14 (the rotation process of opening and closing the smoke channel 10). After the second thermal deformation component is deformed by heat and releases the limit on the tension spring 71, the tension spring 71 moves toward the position of the installation shaft 3 while releasing its elastic potential energy, and acts on the extension column 330 at the end of the installation shaft 3, thereby driving the installation shaft 3 to rotate around its own axis, so that the valve plate 14 closes the smoke channel 10.

[0056] The second thermal deformation assembly of this embodiment includes a third temperature-sensitive sheet 721 and a fourth temperature-sensitive sheet 722. The first end of the third temperature-sensitive sheet 721 is fixed on the mounting plate 16, and the second end is bonded to the fourth temperature-sensitive sheet 722 to form an L-shaped bent hook (i.e., the second limit stopper) for hanging the tension spring 71. When a fire occurs, the third temperature-sensitive sheet 721 and the fourth temperature-sensitive sheet 722 will be separated when the bonding point is heated to a certain temperature (e.g., 110±5°C). After the fourth temperature-sensitive sheet 722 is separated from the second end of the third temperature-sensitive sheet 721, the tension spring 71 will also slide off from the second end of the third temperature-sensitive sheet 721. The tension spring 71 drives the mounting shaft 3 to deflect during the process of restoring the original state (the process of releasing elastic potential energy), thereby driving the valve sheet 14 to close.

Claims

1. A check valve for a range hood, comprising: A housing (1) having a smoke passage (10) formed therein; A valve plate assembly comprises a mounting shaft (3) rotatably mounted on a housing (1) and a valve plate (14) mounted on the mounting shaft (3) and capable of opening and closing a smoke passage (10) as the mounting shaft (3) rotates; A driving device having a power output shaft (20), wherein the power output shaft (20) is connected to the installation shaft (3) to drive the installation shaft (3) to rotate; The invention is characterized in that: the power output shaft (20) and the installation shaft (3) are connected by a limit pin (4) which is radially movable and penetrates the two shafts, and the limit pin (4) has a first state in which torque can be transmitted between the two shafts to realize linkage, and a second state in which the linkage between the power output shaft (20) and the installation shaft (3) is released as its moving position changes; It also includes a first thermal deformation component that can drive the limit pin shaft (4) to move from the position of the first state to the position of the second state under heating conditions, and the heat sensing end of the first thermal deformation component is located in the smoke channel (10) of the housing (1); It also includes an elastic biasing component and a second thermal deformation component, wherein the elastic biasing component has a power action end that can move toward the valve plate assembly to act on the mounting shaft (3) or the valve plate (14) to cause it to rotate, and the second thermal deformation component is arranged on the housing (1) and has a limiting state that limits the movement of the elastic biasing component toward the valve plate assembly and a non-limiting state that deforms under heat conditions to release the limiting of the elastic biasing component and allows the elastic biasing component to move toward the valve plate assembly to drive the valve plate (14) to rotate and close the smoke channel (10).

2. The check valve for range hood according to claim 1, characterized in that: The elastic biasing member comprises a strip spring piece (61) arranged in the outer shell (1), the first end of the strip spring piece (61) is fixed on the inner wall of the outer shell (1), and the other end is limited by the second thermal deformation component to be away from the valve plate (14), and always has a tendency to move toward the valve plate assembly and act on the valve plate (14) to cause the valve plate (14) to close the smoke channel (10).

3. The check valve for range hood according to claim 2, characterized in that: The second thermal deformation component is arranged in the smoke channel (10) of the shell (1), and comprises a first temperature-sensitive sheet (621) and a second temperature-sensitive sheet (622), wherein the first end of the first temperature-sensitive sheet (621) is fixed to the shell (1), and the second end is bonded to the second temperature-sensitive sheet (622) to form a first limit stop for limiting the strip spring sheet (61) from sliding off the second end of the first temperature-sensitive sheet (621).

4. The check valve for range hood according to claim 1, characterized in that: The outer portion of the housing (1) is also provided with a placement shell (15) for placing the drive device, the end of the installation shaft (3) extends into the placement shell (15) and is connected to the power output shaft (20) of the drive device, and the end of the installation shaft (3) is also provided with a radially extending swing arm (33); The elastic biasing member includes a tension spring (71) arranged in the housing shell (15), two ends of the tension spring (71) are fixed relative to the housing shell (15), and the main body of the tension spring (71) is limited by the second thermal deformation component and is away from the swing arm (33) and maintained in a stretched state. After the second thermal deformation component is thermally deformed to release the limitation on the tension spring (71), the tension spring (71) moves toward the swing arm (33) and acts on the swing arm (33), driving the installation shaft (3) to rotate so that the valve plate (14) closes the smoke channel (10).

5. The check valve for range hood according to claim 4, characterized in that: A mounting plate (16) for fixing the driving device is provided in the housing shell (15), and the mounting plate (16) is perpendicular to the axis of the mounting shaft (3). Both ends of the tension spring (71) are fixed on a side wall of the mounting plate (16) facing the mounting shaft (3). An extension column (330) extending toward the mounting plate (16) is provided on the swing arm (33) of the mounting shaft (3) at an end position away from the mounting shaft (3). After the second thermal deformation component is thermally deformed to release the limit on the tension spring (71), the tension spring (71) acts on the extension column (330) and drives the mounting shaft (3) to rotate around its own axis.

6. The check valve for range hood according to claim 5, characterized in that: The second thermal deformation component is arranged in the housing shell (15) and comprises a third temperature-sensitive sheet (721) and a fourth temperature-sensitive sheet (722); the first end of the third temperature-sensitive sheet (721) is fixed on the mounting plate (16), and the second end is bonded to the fourth temperature-sensitive sheet (722) to form a second limit stop for limiting the tension spring (71) from sliding off the second end of the third temperature-sensitive sheet (721).

7. The check valve for a range hood according to any one of claims 1 to 6, characterized in that: One of the power output shaft (20) and the mounting shaft (3) is provided with an axially extending mounting hole (31) and a first radial hole (32) which is radially opened and communicated with the mounting hole (31); the other is provided with a mounting end (21) which extends into the mounting hole (31); the mounting end (21) is provided with a second radial hole (22) which is radially opened and communicated with the first radial hole (32); the limit pin (4) is movably arranged in the first radial hole (32) and / or the second radial channel; when the limit pin (4) is located in the first state, the limit pin (4) is simultaneously arranged in the first radial hole (32) and the second radial channel; when the limit pin (4) is located in the second state, the limit pin (4) moves out of the second radial hole (22) and enters the first radial hole (32).

8. The check valve for range hood according to claim 7, characterized in that: The mounting hole (31) is arranged on the mounting shaft (3), and the end of the power output shaft (20) corresponding to the end extending into the mounting hole (31) constitutes the mounting end (21). An elastic member (51) is also arranged in the second radial hole (22) of the power output shaft (20), and the elastic member (51) acts on the inner end of the limit pin shaft (4) and makes the limit pin shaft (4) always have a tendency to move from the second radial hole (22) to the first radial hole (32); The outer peripheral wall of the installation shaft (3) is also provided with a heat-deformable spring piece (52) that is deformed after being heated. The heat-deformable spring piece (52) blocks the end of the first radial channel (32) and abuts against the outer end of the limit pin (4). A portion of the heat-deformable spring piece (52) extends into the smoke channel (10) of the housing (1). After being deformed by heat, the heat-deformable spring piece (52) is away from the end of the first radial channel (32) to allow the limit pin (4) to move out of the second radial channel (22); The elastic member (51) and the thermal deformation spring sheet (52) together constitute the first thermal deformation component.

9. The check valve for a range hood according to claim 8, characterized in that: The elastic member (51) is a compression spring arranged in the second radial channel (22).

10. The check valve for a range hood according to any one of claims 1 to 6, characterized in that: The mounting shaft (3) is also provided with a radially extending swing arm (3) that can rotate with the mounting shaft (3); the housing (1) is also provided with a mounting plate (16); the mounting plate (16) has a first limiting rib (161) and a second limiting rib (162) for limiting the rotation angle of the swing arm (33); when the valve plate (14) is in a state of closing the smoke channel (10), the swing arm (33) abuts against the first limiting rib (161); when the valve plate (14) is in a state of opening the smoke channel (10), the swing arm (33) abuts against the second limiting rib (162).

11. A range hood, comprising a body, wherein a check valve is provided at an air outlet of the body, wherein the check valve is the check valve for a range hood according to any one of claims 1 to 10.

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