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 check valve comprises a shell internally provided with a smoke channel, the shell is provided with a mounting shaft which is arranged in the radial direction of the smoke channel and a valve plate which is arranged on the mounting shaft and can rotate along with the mounting shaft to open and close the smoke channel; the driving device is provided with a power output shaft, and the power output shaft is connected with the mounting shaft so as to drive the mounting shaft and the valve plate to rotate; the mounting shaft is provided with a first end part connected with the power output shaft and a second end part far away from the power output shaft, and the mounting shaft is arranged on the shell in a sliding manner in a manner of moving along the axial direction of the mounting shaft relative to the shell; along with the change of the moving position of the mounting shaft, the mounting shaft has a linkage state in which the first end part of the mounting shaft is connected with the power output shaft to transmit torque and a non-linkage state in which the first end part of the mounting shaft is separated from the power output shaft to allow the mounting shaft to freely rotate around the axis of the mounting shaft.

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 connection pin shaft 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 electric fire damper is oily after use, and direct disassembly requires a lot of cleaning work, which is difficult to repair. In addition, the cost of disassembling and replacing a new electric fire damper is high. Since the motor shaft of the electric fire damper is connected to the valve plate through the driving shaft, if the motor of the electric fire damper is to be disassembled and replaced, it is necessary to first disconnect the smoke pipe from the valve body, remove the valve plate, and then replace the motor. The maintenance operation is cumbersome and the maintenance cost is high.

[0005] Therefore, the existing fire dampers for range hoods need further improvement. Utility Model Content

[0006] The first technical problem to be solved by the utility model is to provide a check valve for range hoods that can conveniently disconnect the linkage between the valve plate and the motor output shaft for maintenance, simplify the maintenance process, and reduce maintenance costs 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 shell with a smoke passage formed inside, the shell having a radially arranged mounting shaft of the smoke passage and a valve sheet arranged on the mounting shaft and capable of opening and closing the smoke passage by rotating with the mounting shaft;

[0010] A driving device, comprising a power output shaft, the power output shaft being connected to the installation shaft to drive the installation shaft and the valve plate to rotate;

[0011] The mounting shaft has a first end portion connected to the power output shaft and a second end portion away from the power output shaft. The mounting shaft is slidably arranged on the housing in a manner capable of moving relative to the housing along the axial direction of the mounting shaft, and has a linkage state in which the first end portion is connected to the power output shaft to transmit torque as its moving position changes, and has a non-linkage state in which the first end portion is disengaged from the power output shaft to allow the mounting shaft to rotate freely around its own axis.

[0012] In order to facilitate the adjustment of the axial position of the installation shaft and avoid interference with the rotation of the installation shaft, the housing is provided with a second opening at a position corresponding to the second end of the installation shaft and a sleeve rotationally constrained in the second opening, the second end of the installation shaft is inserted into the sleeve, and partially passes through the end wall of the sleeve and is exposed, thereby forming an operating knob for the user to operate;

[0013] The sleeve is also provided with a first screw, which passes through the end wall of the sleeve and is connected to the second end of the mounting shaft, and drives the mounting shaft away from the power output shaft of the driving device or close to the power output shaft of the driving device as the first screw rotates forward or reversely;

[0014] It also includes a first elastic member, which acts on the installation shaft and makes the installation shaft always have a tendency to move toward the position where the power output shaft of the driving device is located.

[0015] The above-mentioned elastic member can 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 above-mentioned first screw, the first elastic member is a spring, which is sleeved on the first screw and pressed between the second end of the mounting shaft and the end wall of the sleeve.

[0016] In order to improve the user's operating feel, the operating knob at the second end of the installation shaft is in the shape of an elongated strip and extends radially along the installation shaft, and a strip opening adapted to the operating knob is provided on the end wall of the sleeve.

[0017] In order to facilitate the adjustment of the axial position of the installation shaft and avoid interference with the rotation of the installation shaft, another feasible solution is: the housing is provided with an opening at a position corresponding to the second end of the installation shaft and a sleeve that is rotationally constrained in the opening, the second end of the installation shaft is inserted into the sleeve, and partially passes through the end wall of the sleeve and is exposed, thereby forming an operating knob for the user to operate;

[0018] The sleeve is also provided with a second screw, which is threadedly connected to the end wall of the sleeve and passes through the end wall of the sleeve to abut against the second end of the mounting shaft, and drives the mounting shaft to approach the power output shaft of the driving device as the second screw rotates;

[0019] It also includes a second elastic member, which acts on the installation shaft and makes the installation shaft always have a tendency to move away from the power output shaft of the driving device.

[0020] The above-mentioned elastic member can 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 above-mentioned installation shaft, the second elastic member is a spring, which is pressed between the first end of the installation shaft and the end of the power output shaft of the drive device.

[0021] In order to improve the user's operating feel, the operating knob at the second end of the installation shaft is in the shape of an elongated strip and extends radially along the installation shaft, and a strip opening adapted to the operating knob is provided on the end wall of the sleeve.

[0022] In order to adjust the position of the mounting shaft in the axial direction, another feasible solution is:

[0023] A limit pin is movably mounted on the housing along its axial direction, and its extension direction is perpendicular to the axial direction of the installation shaft. With the change of its moving position, it has a limit state that can limit the movement of the installation shaft in the axial direction away from the power output shaft, so that the installation shaft and the power output shaft are kept in a linkage state, and a non-limit state that releases the limit on the installation shaft and allows the installation shaft to move along its axial direction;

[0024] The third elastic member acts on the installation shaft and makes the installation shaft always have a tendency to move away from the power output shaft of the driving device.

[0025] As an improvement, the limiting pin is a third screw threadedly connected to the housing.

[0026] In order to cooperate with the above-mentioned limit pin and facilitate the user to move the mounting shaft through the operating knob, the outer shell is provided with an opening at a position corresponding to the second end of the mounting shaft and a sleeve rotatably constrained in the opening, and the second end of the mounting shaft is inserted into the sleeve and partially passes through the end wall of the sleeve and is exposed, thereby forming an operating knob for the user to operate.

[0027] In order to protect the operating knob in the linkage state (working state), when the mounting shaft and the power output shaft of the driving device are in the linkage state, the end face of the operating knob is flush with the outer wall surface of the end wall of the sleeve.

[0028] In order to simplify the linkage matching structure between the installation shaft and the power output shaft of the driving device, so that the installation shaft can be plugged with the power output shaft of the driving device after being moved into position, one of the first end of the installation shaft and the end of the power output shaft is provided with an axially opened axial installation channel, and the other is provided with a plug column that can be inserted into the above-mentioned axial installation channel to achieve linkage between the installation shaft and the power output shaft. Preferably, the first end of the installation shaft is provided with the above-mentioned axial installation channel, and the end of the power output shaft of the driving device is provided with the above-mentioned plug column.

[0029] In order to realize automatic control and adjustment of the valve plate of the check valve, the driving device includes a driving motor arranged on the housing.

[0030] In order to place the driving device on the outer shell and protect the driving device, a placement shell is also provided on the outer shell. The placement shell includes a shell body arranged on the outer wall surface of the outer shell and having an opening, and a protective cover covering the opening of the shell body. The driving device is arranged in the placement shell, and the first end of the mounting shaft passes through the outer shell and extends into the placement shell, and is connected to the power output shaft of the driving device.

[0031] 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 housing shell is also provided with a limiting member, 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.

[0032] The technical solution adopted by the utility model to solve the second technical problem is: a range hood, comprising a body and a check valve arranged at the smoke outlet of the body, wherein the check valve adopts the above-mentioned check valve for range hoods.

[0033] Compared with the prior art, the utility model has the following advantages: the installation shaft for installing the valve plate can move axially relative to the housing. When normal operation is required, the installation shaft can move toward the power output shaft of the drive device. After moving into place, it can be connected with the power output shaft and be in a linkage state to transmit torque; and when maintenance is required, the installation shaft can move toward the power output shaft away from the drive device, and be separated from the power output shaft and be in a non-linkage state. In this state, the installation shaft can rotate freely around its own axis. Therefore, when the electric valve motor is damaged or the linkage fails, the valve plate can be manually opened normally for smoke exhaust. The utility model can realize automatic control and manual adjustment control of the rotating valve plate of the fire damper. After disconnecting the linkage between the valve plate and the power output shaft of the drive device, the drive device (such as a motor) can also be directly disassembled for replacement, which simplifies the maintenance process and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the three-dimensional structure of the check valve of Example 1 of the utility model;

[0035] Figure 2 This is an axial cross-sectional view of the check valve of Example 1 of the utility model (the mounting shaft and the power output shaft are in a linkage state);

[0036] Figure 3 This is an axial cross-sectional view of the check valve of Example 1 of the utility model (the mounting shaft and the power output shaft are in a non-linked state);

[0037] Figure 4 This is an exploded view of the check valve of Example 1 of the utility model;

[0038] Figure 5 This is a schematic diagram of the three-dimensional structure of the check valve of Example 1 of the utility model without the protective cover and the driving device;

[0039] Figure 6 This is an axial cross-sectional view of the check valve of Example 2 of the utility model (the mounting shaft and the power output shaft are in a linkage state);

[0040] Figure 7 This is an axial cross-sectional view of the check valve of Example 2 of the utility model (the mounting shaft and the power output shaft are in a non-linked state);

[0041] Figure 8 This is an axial cross-sectional view of the check valve of Example 3 of the utility model (the mounting shaft and the power output shaft are in a linkage state);

[0042] Fig. 9 It is an axial cross-sectional view of the check valve of Example 4 of the utility model (the mounting shaft and the power output shaft are in a non-linked state). DETAILED DESCRIPTION

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0044] 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.

[0045] Example 1

[0046] Figure 1-Figure 5 A preferred embodiment of the check valve for range hoods of the utility model is shown. The check valve for range hoods can be installed on the air outlet path of the range hood body. The fire damper includes a housing 1, a valve plate 14 and a driving device.

[0047] 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.

[0048] The housing 1 has 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 channel 10 as its rotation position changes. The valve plate 14 of this embodiment is a circular plate body, the mounting shaft 3 is arranged along the radial direction of the valve plate 14, and the mounting shaft 3 and the valve plate 14 are connected together by two spaced-apart ferrules 141. Specifically, the cross-section of the main part of the mounting shaft 3 is semicircular, and the ferrule 141 is also correspondingly semicircular, for the main body of the mounting shaft 3 to pass through. The main body of the mounting shaft 3 has a plane that can fit with the surface of the valve plate 14. More specifically, the above-mentioned ferrule does not completely lock the mounting shaft 3, but allows the mounting shaft 3 to move relative to the valve plate 14 in the radial direction of the valve plate 14 (that is, along the axial direction of the mounting shaft 3).

[0049] The two ends of the installation shaft 3 in the length direction of this embodiment are respectively recorded as the first end 31 and the second end 32. The outer peripheral wall of the housing 11 has two first openings 131 and the second opening 132 which are opposite in the radial direction. The first end 31 and the second end 32 of the installation shaft 3 are rotatably installed in the first opening 131 and the second opening 132 respectively. Among them, the first end 31 of the installation shaft 3 passes through the first opening 131 of the housing 1 and is connected to the power output shaft 20 of the driving device arranged on the housing 1. A sleeve 4 is arranged in the second opening 132 of the housing 1. The size of the main body of the sleeve 4 is substantially consistent with the size of the second opening 132, thereby ensuring that the sleeve 4 can stably rotate in the second opening 132. One end of the sleeve 4 is open, and the second end 32 of the installation shaft 3 can be inserted therein, while the other end is closed to form an end wall 40. The edge position of the opening of the sleeve 4 has a second limit stop edge 41 extending radially outward, and the second limit stop edge 41 can abut against the inner side of the outer peripheral edge of the second opening 132 of the housing 1. More specifically, after the second end 32 of the mounting shaft 3 is inserted into the shaft sleeve 4, a part of the second end 32 of the mounting shaft 3 can pass through the end wall 40 of the shaft sleeve 4 and be exposed, thereby forming an operating knob 35 for the user to operate. Preferably, in order to improve the user's operating feel, the operating knob 35 of the second end 32 of the mounting shaft 3 of this embodiment is in a long strip shape and extends along the radial direction of the mounting shaft 3, and a strip opening 401 adapted to the operating knob 35 is provided on the end wall 40 of the shaft sleeve 4. After the linkage between the mounting shaft 3 and the power output shaft 20 is released, the user can manually adjust the rotation angle of the valve plate 14 by operating the operating knob 35.

[0050] The driving device of this embodiment includes a driving motor 2 arranged on the outer shell 1. The output shaft of the driving motor 2 is the power output shaft 20 of the driving device. A placement shell 15 is provided on the outer wall of the outer shell 1, and the driving motor 2 and other components are arranged in the placement shell 15. In order to facilitate the installation of the driving motor 2 and other components, the placement shell 15 includes a shell body 151 integrally formed on the main body of the outer shell 1 and a protective cover 152 covering the open part of the shell body 151. The first end 31 of the mounting shaft 3 corresponds to the first opening 131 of the outer shell 1 and extends into the interior of the placement shell 15, and is connected to the output shaft of the driving motor 2. When the driving motor 2 rotates forward and reversely, it can drive the mounting shaft 3 and the valve plate 14 to rotate around the axis of the mounting shaft 3 to open or close the smoke channel 10.

[0051] See also Figure 4A radially extending swing arm 33 that can rotate with the mounting shaft 3 is also provided at the first end 31 of the mounting shaft 3. The swing arm 33 of this embodiment is designed as a whole with the mounting shaft 3 and is located in the placement shell 15. A stopper 16 is also provided in the placement shell 15. The stopper 16 is in the shape of a plate as a whole and is fixed relative to the housing 1, and can be used to fix the drive motor 2. The limiting member 16 has 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 states. 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.

[0052] The inner peripheral wall of the housing 1 is also provided with a third limiting rib 133 extending inwardly to limit the rotation of the valve plate 14. The third limiting rib 133 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 133, thereby making it possible for the valve plate 14 to be stably maintained in a closed state.

[0053] An important inventive point of the present embodiment is that the mounting shaft 3 is slidably arranged on the housing 1 in such a manner that it can move axially relative to the housing 1 along the mounting shaft 3, and as its moving position changes, it has a linkage state in which its first end 31 is connected to the power output shaft 20 to transmit torque, and has a non-linkage state in which its first end 31 is disengaged from the power output shaft 20 to allow the mounting shaft 3 to rotate freely around its own axis.

[0054] In order to realize flexible switching between the linkage state and the non-linkage state between the installation shaft 3 and the power output shaft 20 of the driving device, the first end 31 of the installation shaft 3 is provided with an axial installation channel 310 opened axially, and the end of the power output shaft 20 of the driving device is provided with a plug column 21 that can be inserted into the above-mentioned axial installation channel 310 to realize linkage between the installation shaft 3 and the power output shaft 20. Specifically, in order to effectively transmit torque, the cross section of the plug column 21 is non-circular, such as semi-circular, and the cross section of the axial installation channel 310 is also non-circular, such as semi-circular.

[0055] The end wall 40 of the sleeve 4 of this embodiment is also provided with a first screw 51, which passes through the end wall 40 of the sleeve 4 and is connected to the screw hole on the second end 32 of the installation shaft 3. When the first screw 51 rotates forward or backward, the installation shaft 3 can be driven away from the power output shaft 20 of the driving device or close to the power output shaft 20 of the driving device, thereby realizing the axial position adjustment of the installation shaft 3. The first screw 51 is also sleeved with a spring (the spring is the first elastic member 61), which is pressed between the second end 32 of the installation shaft 3 and the end wall 40 of the sleeve 4, so that the installation shaft 3 always has a tendency to move toward the position where the power output shaft 20 of the driving device is located, and at the same time, the sleeve 4 has a tendency to move away from the installation shaft 3, and the second limit stop edge 41 of the sleeve 4 is also maintained in a state of abutting against the inner side of the outer peripheral edge of the second opening 132 of the housing 1.

[0056] When the mounting shaft 3 and the power output shaft 20 of the driving device are in a linkage state, the end face of the operating knob 35 of the second end portion 32 of the mounting shaft 3 is flush with the outer wall surface of the end wall 40 of the sleeve 4, that is, the operating knob 35 of the mounting shaft 3 can be relatively retracted inward and hidden, thereby realizing the protection of the operating knob 35 in the linkage state (working state).

[0057] The present embodiment also relates to a range hood, comprising a body, wherein the above-mentioned fire damper is provided at the smoke outlet of the body.

[0058] The operation process of the working mode and maintenance mode of the range hood check valve of this embodiment is as follows:

[0059] Rotate the first screw 51 in the forward direction (the sleeve 4 can be supported by hand at the same time), the first screw 51 is in the screwed-in state, at this time, the installation shaft 3 moves in the direction away from the drive device under the drive of the first screw 51, and when the first screw 51 rotates to the set position, the axial installation channel 310 of the first end 31 of the installation shaft 3 is disengaged from the plug at the end of the power output shaft 20 of the drive device, thereby, the installation shaft 3 and the power output shaft 20 of the drive device are in a non-linked state, that is, in this state, the installation shaft 3 can rotate freely around its own axis, that is, when the motor is damaged or the linkage fails, the valve plate 14 can be manually opened normally for smoke exhaust. After disconnecting the linkage between the valve plate 14 and the power output shaft 20 of the drive device, the drive device (such as the motor) can also be directly disassembled for replacement, which simplifies the maintenance process and reduces the maintenance cost. Similarly, when the inspection is completed, the first screw 51 is rotated in the opposite direction, and the first screw 51 is in a screwed-out state. At this time, the mounting shaft 3 moves toward the direction close to the driving device under the drive of the first screw 51. When the first screw 51 is rotated to the set position, the axial mounting channel 310 of the first end portion 31 of the mounting shaft 3 is plugged into the plug block at the end of the power output shaft 20 of the driving device. At this time, the mounting shaft 3 and the power output shaft 20 of the driving device are in a linkage state and can transmit torque. After the driving device is started, it can drive the valve plate 14 to open or close the smoke channel 10.

[0060] Example 2

[0061] Figure 6 and Figure 7 Another preferred embodiment of the check valve for range hood of the utility model is shown. The difference between this embodiment and embodiment 1 is that: a spring (i.e., the second elastic member 62) is arranged between the first end 31 of the mounting shaft 3 and the end of the power output shaft 20 of the driving device, that is, under the elastic force of the spring, the mounting shaft 3 has a tendency to move away from the driving device, and correspondingly, a second screw 52 is arranged on the end wall 40 of the sleeve 4, that is, the second screw 52 is screwed to the end wall 40 of the sleeve 4, and passes through the end wall 40 of the sleeve 4 to abut against the second end 32 of the mounting shaft 3. When the second screw 52 is screwed in, it can press the mounting shaft 3 close to the power output shaft 20 of the driving device, so that the axial mounting channel 310 of the first end 31 of the mounting shaft 3 and the plug block at the end of the power output shaft 20 of the driving device are plugged into place and are in a linkage state. When the second screw 52 is gradually unscrewed, the mounting shaft 3 moves in a direction away from the power output shaft 20 of the drive device under the elastic force of the spring, so that the axial mounting channel 310 of the first end 31 of the mounting shaft 3 is disengaged from the plug at the end of the power output shaft 20 of the drive device and is in a non-linked state.

[0062] Example 3

[0063] Figure 8 and Fig. 9 Another preferred embodiment of the check valve for range hood of the utility model is shown. The difference between this embodiment and embodiment 2 is that: the second screw 52 provided on the shaft sleeve 4 is cancelled and replaced by: a limit pin is provided on the housing 1 adjacent to the first end 31 of the mounting shaft 3, specifically, the limit pin is movable on the housing 1 along its axial direction, its extension direction is perpendicular to the axial direction of the mounting shaft 3, and with the change of its moving position, it has a limit state that can limit the movement of the mounting shaft 3 in the axial direction away from the power output shaft 20, so that the mounting shaft 3 and the power output shaft 20 are kept in a linkage state, and has a non-limit state that releases the limit on the mounting shaft 3 and allows the mounting shaft 3 to move along its axial direction. Specifically, the limit pin is threadedly connected to the housing shell 15 of the outer shell 1 by a third screw 53, and the inner end of the third screw 53 extends into the housing shell 15. Correspondingly, a first limit stop edge 34 (specifically annular) extending radially outward is also provided at the second end 32 of the mounting shaft 3. The inner end of the third screw 53 can abut against the side of the first limit stop edge 34 away from the drive device. In this state, the axial mounting channel 310 of the first end 31 of the mounting shaft 3 and the plug-in block at the end of the power output shaft 20 of the drive device are also plugged together and are in a linkage state.

[0064] A spring (i.e., a third elastic member) is provided between the first end portion 31 of the mounting shaft 3 and the end portion of the power output shaft 20 of the driving device, and the setting position and working mode of the spring are the same as the second elastic member in Embodiment 2. That is, under the elastic force of the spring, the mounting shaft 3 has a tendency to move away from the driving device.

[0065] The operation process of the working mode and maintenance mode of the range hood check valve of this embodiment is as follows:

[0066] The user can manually press the operating knob 35 of the second end 32 of the installation shaft 3 inward. After pressing in place, the axial installation channel 310 of the first end 31 of the installation shaft 3 is also plugged into the plug block at the end of the power output shaft 20 of the driving device. Then the third screw 53 is screwed in so that its inner end abuts against the side of the first limit stop 34 of the installation shaft 3 away from the driving device to limit the movement of the installation shaft 3 toward the side away from the driving device. At this time, the installation shaft 3 and the power output shaft 20 of the driving device are in a linkage state and can transmit torque. After the driving device is started, it can drive the valve plate 14 to open or close the smoke channel 10. When maintenance is required, the third screw 53 can be directly screwed out to contact the axial limit of the first limit stop 34 of the installation shaft 3. Under the action of the third elastic member, the installation shaft 3 moves in the direction away from the power output shaft 20 of the driving device, so that the axial installation channel 310 of the first end 31 of the installation shaft 3 is disengaged from the plug block at the end of the power output shaft 20 of the driving device, and is in a non-linked state.

Claims

1. A check valve for a range hood, comprising: A housing (1) having a smoke passage (10) formed therein, the housing (1) having a mounting shaft (3) arranged radially of the smoke passage (10) and a valve plate (14) arranged on the mounting shaft (3) and capable of opening and closing the smoke passage (10) by rotating with the mounting shaft (3); 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) and the valve plate (14) to rotate; The invention is characterized in that: the mounting shaft (3) has a first end (31) for connecting to the power output shaft (20) and a second end (32) away from the power output shaft (20); the mounting shaft (3) is slidably arranged on the housing (1) in a manner capable of moving relative to the housing (1) along the axial direction of the mounting shaft (3); and as its moving position changes, it has a linkage state in which its first end (31) is connected to the power output shaft (20) to transmit torque, and has a non-linkage state in which its first end (31) is disengaged from the power output shaft (20) to allow the mounting shaft (3) to rotate freely around its own axis.

2. The check valve for range hood according to claim 1, characterized in that: The housing (1) is provided with a second opening at a position corresponding to the second end (32) of the mounting shaft (3) and a shaft sleeve (4) rotatably constrained in the second opening; the second end (32) of the mounting shaft (3) is inserted into the shaft sleeve (4) and partially passes through an end wall (40) of the shaft sleeve (4) to be exposed, thereby forming an operating knob (35) for a user to operate; The shaft sleeve (4) is also provided with a first screw (51), which passes through the end wall (40) of the shaft sleeve (4) and is connected to the second end portion (32) of the mounting shaft (3), and drives the mounting shaft (3) away from the power output shaft (20) of the driving device or close to the power output shaft (20) of the driving device as the first screw (51) rotates forward or backward; It also comprises a first elastic member (61), which acts on the installation shaft (3) and makes the installation shaft (3) always have a tendency to move towards the position where the power output shaft (20) of the driving device is located.

3. The check valve for range hood according to claim 2, characterized in that: The first elastic member (61) is a spring, which is sleeved on the first screw (51) and pressed between the second end portion (32) of the mounting shaft (3) and the end wall (40) of the shaft sleeve (4).

4. The check valve for range hood according to claim 2, characterized in that: The operating knob (35) at the second end (32) of the mounting shaft (3) is in the shape of an elongated strip and extends radially along the mounting shaft (3). The end wall (40) of the sleeve (4) is provided with a strip-shaped opening (401) adapted to the operating knob (35).

5. The check valve for range hood according to claim 1, characterized in that: The housing (1) is provided with a second opening at a position corresponding to the second end (32) of the mounting shaft (3) and a shaft sleeve (4) rotatably constrained in the second opening; the second end (32) of the mounting shaft (3) is inserted into the shaft sleeve (4) and partially passes through an end wall (40) of the shaft sleeve (4) to be exposed, thereby forming an operating knob (35) for a user to operate; The shaft sleeve (4) is also provided with a second screw (52), which is threadedly connected to the end wall (40) of the shaft sleeve (4), passes through the end wall (40) of the shaft sleeve (4), and abuts against the second end portion (32) of the mounting shaft (3), and drives the mounting shaft (3) close to the power output shaft (20) of the driving device as the second screw (52) rotates; It also includes a second elastic member (62), which acts on the installation shaft (3) and makes the installation shaft (3) always have a tendency to move away from the power output shaft (20) of the driving device.

6. The check valve for range hood according to claim 5, characterized in that: The second elastic member (62) is a spring, which is pressed between the first end (31) of the mounting shaft (3) and the end of the power output shaft (20) of the driving device.

7. The check valve for range hood according to claim 5, characterized in that: The operating knob (35) at the second end (32) of the mounting shaft (3) is in the shape of an elongated strip and extends radially along the mounting shaft (3). The end wall (40) of the sleeve (4) is provided with a strip-shaped opening (401) adapted to the operating knob (35).

8. The check valve for range hood according to claim 1, characterized in that Also includes: A limit pin is axially movable on the housing (1), its extension direction is perpendicular to the axial direction of the installation shaft (3), and as its moving position changes, it has a limit state that can limit the movement of the installation shaft (3) in the axial direction away from the power output shaft (20) so that the installation shaft (3) and the power output shaft (20) are kept in a linkage state, and a non-limit state that releases the limit on the installation shaft (3) and allows the installation shaft (3) to move in its axial direction; The third elastic member acts on the installation shaft (3) and causes the installation shaft (3) to always have a tendency to move away from the power output shaft (20) of the driving device.

9. The check valve for a range hood according to claim 8, characterized in that: The limiting pin is a third screw (53) threadedly connected to the housing (1).

10. The check valve for range hood according to claim 8, characterized in that: The housing (1) is provided with an opening at a position corresponding to the second end (32) of the mounting shaft (3) and a shaft sleeve (4) rotatably constrained in the opening; the second end (32) of the mounting shaft (3) is inserted into the shaft sleeve (4) and partially passes through an end wall (40) of the shaft sleeve (4) to be exposed, thereby forming an operating knob (35) for a user to operate.

11. The check valve for range hood according to claim 2, 7 or 10, characterized in that: When the installation shaft (3) and the power output shaft (20) of the driving device are in a linked state, the end surface of the operating knob (35) is flush with the outer wall surface of the end wall (40) of the shaft sleeve (4).

12. The check valve for a range hood according to any one of claims 1 to 10, characterized in that: One of the first end portion (31) of the installation shaft (3) and the end portion of the power output shaft (20) is provided with an axially opened axial installation channel (310), and the other is provided with an insertion column (21) that can be inserted into the above-mentioned axial installation channel (310) to achieve linkage between the installation shaft (3) and the power output shaft (20).

13. The check valve for a range hood according to any one of claims 1 to 11, characterized in that: The driving device comprises a driving motor (2) arranged on the housing (1).

14. The check valve for a range hood according to any one of claims 1 to 11, characterized in that: The outer shell (1) is also provided with a placement shell (15), the placement shell (15) comprising a shell body (151) provided on the outer wall surface of the outer shell (1) and having an opening, and a protective cover (152) covering the opening of the shell body (151), the driving device is provided in the placement shell (15), the first end portion (31) of the installation shaft (3) passes through the outer shell (1) and extends into the placement shell (15), and is connected to the power output shaft (20) of the driving device.

15. The check valve for a range hood according to claim 14, characterized in that: The mounting shaft (3) is also provided with a radially extending swing arm (33) that can rotate with the mounting shaft (3). The placement shell (15) is also provided with a limiting member (16). The limiting member (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 passage (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 passage, the swing arm (33) abuts against the second limiting rib (162).

16. A range hood, comprising a body and a check valve arranged at a smoke outlet of the body, characterized in that: The check valve is the check valve for range hoods according to any one of claims 1 to 15.

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