Low-resistance check valve for range hood

Abstract

The low-resistance range hood check valve comprises a driving ring, a sliding block, a connecting rod and a valve plate, a plurality of driving ring guide grooves are formed in the inner ring of the driving ring, one end of the sliding block is embedded into the driving ring guide grooves, the other end of the sliding block is connected with the connecting rod, and the end of the connecting rod penetrates through a through hole in the end of the valve plate. According to the low-resistance check valve for the range hood, the driving ring guide groove is driven to rotate synchronously through rotation of the driving ring, so that the sliding block is driven to move through the driving ring guide groove, the push-pull effect on the valve plate is achieved through the connecting rod, and the requirement for conducting or cutting off a pipeline channel is met; in addition, the movement trend that the valve plate covers the fixed base under the action of self weight or a torsional spring is avoided, it is effectively guaranteed that no pressure loss is caused to the air pressure of the draught fan in the opening state, and the oil smoke suction and exhaust effect of the range hood is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of range hood, and particularly relates to a low-resistance range hood check valve. BACKGROUND

[0002] In the range hood, in order to prevent the oil fume from flowing backward, and prevent the oil drops condensed in the pipeline from falling back into the range hood, a check valve is generally arranged at the oil fume pipeline. The existing oil fume pipeline check valve of the range hood is generally composed of two valve plates, which rotate around the fixed shaft transversely fixed on the circular channel. When the fan is turned on, the valve plate will rotate around the fixed shaft by a certain angle under the action of wind pressure, so as to open the check valve, and facilitate the air to be sent out from the passage around the valve plate.

[0003] In the prior art, the valve plate is generally reset by the torsional spring sleeved on the fixed shaft, that is, the torsional spring continuously applies a downward torsion to the valve plate by the elastic action, so that the valve plate is closed on the circular channel. Therefore, due to the gravity of the valve plate itself and the elastic action of the torsional spring, the opened valve plate has a tendency to close on the circular channel, so that the valve plate cannot be completely opened. According to the calculation, the valve plate in the prior art can only realize the connection of the pipeline at an opening angle of less than 60° under the action of gravity and the elastic force of the torsional spring. The valve plate that cannot be completely opened will cause a loss of wind pressure in the pipeline, affecting the suction and discharge effect of the oil fume.

[0004] At the same time, the oil contained in the oil fume transported in the pipeline is easy to adhere to the side of the valve plate facing downward. When the valve plate is closed on the circular channel, the adhesion of the adhered oil will cause the valve plate to be adhered to the circular channel, so that the valve plate cannot be normally opened. Therefore, after a long time of work, it is easy to open only one side of the valve plate, and the other side of the valve plate is always in a closed state, which causes a greater loss of wind pressure, and seriously affects the suction and discharge effect of the oil fume. SUMMARY

[0005] The present application provides a low-resistance range hood check valve to solve the prior art problem that the valve plate cannot be completely opened by relying on the wind pressure to drive the valve plate to open and the gravity and the torsional spring to drive the valve plate to reset, thereby causing the airflow in the pipeline to be blocked, the air pressure in the pipeline is reduced due to the obstruction, and the suction effect of the oil fume is affected.

[0006] The first aspect of the application provides a low-resistance range hood check valve, comprising: a driving ring, a slider, a connecting rod, and a valve plate, a plurality of driving ring guide grooves are arranged on the inner ring of the driving ring, one end of the slider is embedded in the driving ring guide groove, the other end of the slider is connected with the connecting rod, and the end of the connecting rod passes through the through hole of the end of the valve plate.

[0007] The driving ring is rotatably arranged on the fixed base, and an included angle is formed between the driving ring guide groove and the slider.

[0008] The slider is embedded in the driving ring guide groove through the guide block at one end and moves along the driving ring guide groove, and moves in the radial direction of the fixed base through the guide structure at the other end.

[0009] The connecting rod is provided with a limiting block at the end, the size of the limiting block is greater than that of the through hole of the valve plate, and the limiting block is in movable contact with the valve plate.

[0010] The valve plate is rotatably connected to the fixed base through the fixed shaft at the end.

[0011] Further, the guide structure comprises: a base guide groove, and a guide pin embedded in the base guide groove.

[0012] The base guide groove extends in the radial direction of the fixed base.

[0013] The guide pin is arranged on the bottom surface of the slider.

[0014] Further, one end of the slider is provided with a connecting rod, and the connecting rod is connected with the connecting rod.

[0015] Further, the connecting rod and the connecting rod are rotatably connected through a spherical joint.

[0016] Further, the through hole adopts a strip-shaped hole, the strip-shaped hole extends in the radial direction of the fixed base, and the connecting rod passes through the strip-shaped hole and moves in the direction of the strip-shaped hole.

[0017] Further, the front end of the connecting rod is bent away from the valve plate.

[0018] Further, the valve plate is circumferentially equidistantly distributed on the fixed base around the center axis of the fixed base.

[0019] Further, the driving ring is connected with a power mechanism, the driving ring is provided with a driving connecting handle, and the driving connecting handle is connected with the output end of the power mechanism.

[0020] Further, the driving connecting handle is arranged on the outer side wall of the driving ring, the side wall of the fixed base is provided with a driving groove corresponding to the driving connecting handle, the driving connecting handle passes out of the driving groove and is connected with the output end of the power mechanism.

[0021] Further, the power mechanism adopts an electric push rod, an oil cylinder or a gas cylinder.

[0022] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0023] The low-resistance range hood check valve provided by the present application drives the driving ring guide groove to rotate synchronously through the rotation of the driving ring, thereby driving the slider to move through the driving ring guide groove, and further realizing the push-pull action on the valve plate through the connecting rod, meeting the needs of conducting or cutting off the pipeline passage, and avoiding the movement trend of the valve plate being closed on the fixed base due to the weight or the action of the torsional spring, effectively ensuring that the pressure loss of the fan pressure is not caused in the open state, and improving the effect of the range hood on sucking and discharging oil smoke.

[0024] At the same time, when the valve plate is opened, the connecting rod has the traction and limiting effect on the valve plate, so that the valve plate cannot be stuck due to the attachment of oil stains, which effectively improves the stability of the overall working state of the check valve. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate one embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, other drawings can also be obtained by those skilled in the art without creative labor under the premise of not paying the creative labor.

[0027] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings, and these exemplary illustrations do not constitute a limitation on the embodiments, and the elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified, and the drawings do not constitute a proportional limitation.

[0028] Figure 1 A structural schematic diagram of a low-resistance range hood check valve provided by the embodiments of the present application.

[0029] Figure 2 A disassembled structural schematic diagram of a low-resistance range hood check valve provided by the embodiments of the present application.

[0030] Figure 3 A structural schematic diagram of a slider.

[0031] Figure 4 A structural schematic diagram of a connecting rod.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 1. driving ring; 11. driving ring guide slot; 12. driving connecting handle; 2. slider; 21. guide block; 22. guide pin; 23. connecting rod; 3. connecting rod; 31. limit block; 32. spherical joint; 4. valve piece; 41. through hole; 5. fixed base; 51. base guide slot; 52. driving slot; 6. power mechanism. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0035] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the elements and settings of the particular examples in the following are described in some detail. This is, of course, done for the purpose of providing a thorough and complete disclosure and is not intended to in any way limit the present application. Furthermore, the present application can be used in any number of environments and iterations. Accordingly, the drawings of the embodiments are schematic and simplified for clarity and ease of understanding.

[0036] In order to facilitate the description, spatial relative terms can be used in the text to describe the relative position relationship or movement of one element or feature with respect to another element or feature as shown in the drawings, such as "internal", "external", "inboard", "outboard", "under", "below", "above", "upper", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawing is flipped over or the posture is changed or the movement state is changed, the directional indications will also change accordingly, for example: the element described as "under" or "below" another element or feature will be oriented as "above" or "over" the other element or feature. Therefore, the example term "below" can include both the upper and lower positions. The device can be additionally oriented (rotated by 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0037] In order to solve the prior art problem that the valve plate cannot be completely opened by relying on wind pressure to drive the valve plate to open and driving the valve plate to reset by gravity and torsional spring, thereby causing obstruction to the airflow in the pipeline, reducing the air pressure in the pipeline due to obstruction, and affecting the suction effect of oil fume, the application provides a low-resistance oil fume extractor check valve, which can limit the valve plate by the limiting block of the connecting rod, thereby avoiding the reset movement trend of the valve plate under the action of gravity, so that the valve plate does not interfere with the suction work of wind pressure, effectively avoids the problem of pressure loss, and ensures stable and reliable oil fume suction effect.

[0038] Please refer to Figure 1 、 Figure 2 The application provides a low-resistance oil fume extractor check valve, which comprises a driving ring 1, a sliding block 2, a connecting rod 3, and a valve plate 4.

[0039] The driving ring 1 is rotatably arranged on a fixed base 5, and the driving ring guide groove 11 and the sliding block 2 form an included angle.

[0040] Please refer to Figure 3 The sliding block 2 is embedded in the driving ring guide groove 11 through the guide block 21 at one end and moves along the driving ring guide groove 11, and moves in the radial direction of the fixed base 5 through the guide structure at the other end.

[0041] Please refer to Figure 4 The connecting rod 3 is provided with a limiting block 31 at the end, the size of the limiting block 31 is greater than that of the through hole 41 of the valve plate 4, and the limiting block 31 is in movable contact with the valve plate 4.

[0042] The valve plate 4 is rotatably connected to the fixed base 5 through a fixed shaft at the end.

[0043] In the normal state, the valve plate 4 is in the closed state and covers the pipeline passage in the center of the fixed base 5, thereby cutting off the pipeline passage, which can effectively prevent the oil fume in the pipeline passage from flowing back to the range hood or prevent the oil droplets adhered and condensed in the pipeline passage from falling into the range hood. When it is necessary to open the check valve to suck the oil fume by the fan, the driving ring 1 is rotated, so that the driving ring guide groove 11 rotates with the driving ring 1. In this process, because the driving ring guide groove 11 and the sliding block 2 are at a certain angle, the sliding block 2 is moved away from the center of the fixed base 5 by the pulling of the driving ring guide groove 11. In the process of moving the sliding block 2, the limiting block 31 at the end of the connecting rod 3 contacts the bottom surface of the closed valve plate 4 and moves away from the center of the fixed base 5 with the sliding block 2, thereby pulling the valve plate 4 to turn up around the fixed shaft, realizing the open state of the check valve and facilitating the oil fume to be sucked by the wind pressure generated by the fan.

[0044] In the open state, the valve plate 4 is limited by the limiting block 31 of the connecting rod 3, thereby avoiding the reset movement trend of the valve plate 4 under the action of gravity, so that the valve plate 4 does not interfere with the suction work of the wind pressure and the problem of pressure loss can be effectively avoided, thereby ensuring the stable and reliable effect of sucking the oil fume. At the same time, because the sliding block 2 is moved by the rotation of the driving ring 1 in the embodiment of the application, and the valve plate 4 is driven to rotate by the connecting rod 3, the valve plate 4 is not easy to stick even if there is oil dirt on the surface of the valve plate 4 by directly applying the pulling external force to the valve plate 4, thereby effectively ensuring the normal opening and closing of the valve plate 4 and improving the overall service life of the check valve and the range hood.

[0045] In some embodiments, the guide structure comprises a base guide groove 51 and a guide pin 22 embedded in the base guide groove 51.

[0046] The base guide groove 51 extends along the radial direction of the fixed base 5.

[0047] The guide pin 22 is arranged on the bottom surface of the sliding block 2.

[0048] When the driving ring 1 rotates, the driving ring guide groove 11 rotates with the driving ring 1, the guide block 21 on the sliding block 2 is pulled by the inclined driving ring guide groove 11, and the sliding block 2 moves along the direction of the base guide groove 51 by the cooperation and guidance between the guide pin 22 and the base guide groove 51, thereby improving the stability of the moving path of the sliding block 2 and stably driving the connecting rod 3 to pull the valve plate 4, so that the valve plate 4 realizes the opening and closing action.

[0049] In some embodiments, one end of the sliding block 2 is provided with a connecting rod 23, which is connected with the connecting rod 3. The connecting rod 23 and the connecting rod 3 are rotatably connected through a spherical joint 32. By arranging the spherical joint 32 at the connecting position of the connecting rod 23 and the connecting rod 3, when the sliding block 2 moves under the driving of the driving ring guide groove 11, the connecting rod 3 can move within a certain angle range, so as to avoid the interference of the fixed connecting rod 3 to the movable range of the valve plate 4, so that the opening angle of the valve plate 4 in the open state can reach 90°, and the pressure loss caused by the wind pressure is reduced.

[0050] In some embodiments, the through hole 41 is a strip-shaped hole extending along the radial direction of the fixed base 5, and the connecting rod 3 passes through the strip-shaped hole and moves along the direction of the strip-shaped hole. By adopting the strip-shaped hole as the through hole 41, a certain movement amount is provided for the movement of the connecting rod 3 when the connecting rod 3 moves with the sliding block 2. When the driving ring 1 rotates and drives the sliding block 2 to move away from the center of the fixed base 5 through the driving ring guide groove 11, the connecting rod 3 moves relative to the strip-shaped hole, so that the end of the connecting rod 3 away from the direction of the sliding block 2 is in contact with the strip-shaped hole, and under the adjustment of the spherical joint 32, the end of the connecting rod 3 moves downward, and at this time, the connecting rod 3 keeps in contact with the end of the strip-shaped hole away from the direction of the sliding block 2. When the valve plate 4 is opened, the valve plate 4 is driven to move to a larger opening angle through the contact with the end of the strip-shaped hole away from the direction of the sliding block 2, so that the valve plate 4 moves to a 90° opening angle position within a shorter driving distance, and the loss of the wind pressure in the pipeline passage caused by the valve plate 4 in the open state is effectively avoided.

[0051] In some embodiments, the front end of the connecting rod 3 is bent away from the valve plate 4, so that the relative displacement amount between the connecting rod 3 and the valve plate 4 is larger when the sliding block 2 moves away from the center of the fixed base 5, and thus the opening angle of the valve plate 4 can be increased when the valve plate 4 is opened. At the same time, when the opening angle of the valve plate 4 is large, the end of the strip-shaped hole moves in contact with the bent portion of the front end of the connecting rod 3, and interference between the valve plate 4 and the connecting rod 3 is avoided, so that the stability of the valve plate 4 during opening can be ensured.

[0052] In some embodiments, the valve plates 4 are circumferentially and equidistantly distributed on the fixed base 5 around the center axis of the fixed base 5. When the valve plates 4 are in the closed state, the side edges of adjacent valve plates 4 are in contact, and the ends of the valve plates 4 meet at the center line of the fixed base 5, so that the covering effect on the pipeline passage is achieved.

[0053] In some embodiments, the driving ring 1 is connected with a power mechanism 6, and a driving connection handle 12 is arranged on the driving ring 1 and connected with an output end of the power mechanism 6. When switching the opening and closing state of the check valve, the rotation state of the driving ring 1 is driven by the power mechanism 6 as a power source, and the driving connection handle 12 drives the valve plate 4 to realize the switching of the opening and closing action through the movement of the sliding block 2 and the driving of the connecting rod 3.

[0054] In some embodiments, the driving connection handle 12 is arranged on the outer side wall of the driving ring 1, and the side wall of the fixed base 5 is provided with a driving groove 52 corresponding to the driving connection handle 12. The driving connection handle 12 penetrates out of the driving groove 52 and is connected with the output end of the power mechanism 6.

[0055] By penetrating the driving connection handle 12 through the driving groove 52 and connecting it with the output end of the power mechanism 6, the power mechanism 6 is arranged outside the fixed base 5, thereby avoiding the occupation of the internal structure of the pipeline passage by the power mechanism 6 and ensuring that the air pressure in the pipeline passage is not affected. At the same time, by arranging the power mechanism 6 outside, the installation, debugging, maintenance and replacement of the power mechanism 6 can be facilitated, thereby improving the overall convenience of work.

[0056] In some embodiments, the power mechanism 6 adopts an electric push rod, an oil cylinder or an air cylinder. The electric push rod, the oil cylinder and the air cylinder can all output linear reciprocating thrust, meeting the demand of pushing the driving ring 1 to rotate. Among them:

[0057] The electric push rod has the characteristics of high control precision, no pollution, low maintenance cost, strong applicability and low noise, can realize very precise positioning and speed control, accurately control the rotation of the driving ring 1, and the energy used in the working process is clean, without pollution to the environment. In addition, the electric push rod uses electric energy as a power source, so it can be directly connected to the system of the range hood, and the system of the range hood can provide electric energy, and at the same time, the electric push rod can send corresponding control signals to realize the driving control of the electric push rod.

[0058] The oil cylinder can generate very large thrust and is suitable for application scenarios that require large torque. When the number of valve plates 4 is large, the load is relatively large during the process of driving all valve plates 4 to open and close at the same time, so the use of the oil cylinder can effectively meet the demand of driving the driving ring 1 and controlling the motion state of the valve plate 4. Moreover, since the hydraulic oil has lubricating effect, the wear of the internal components of the oil cylinder is small, so under normal working conditions, the service life of the oil cylinder is long, and it can maintain good working state for a long time, with high stability.

[0059] The principle and structure of the air cylinder are relatively simple, mainly composed of a cylinder, a piston, a piston rod, an end cover and other basic components, easy to manufacture and maintain, and easy to install. At the same time, in the working process of the air cylinder, due to the small viscosity and small flow resistance of air, the action speed of the air cylinder is fast, and fast action response can be realized. The price of the air cylinder itself is relatively low, and the cost of obtaining compressed air is low, which meets the cost control requirements of the overall structure.

[0060] However, the oil cylinder and the air cylinder need to generate corresponding power sources through the hydraulic pump station and the air compressor respectively. In the place where the range hood is used, a hydraulic pump station or an air compressor is generally not configured, so in actual work, the corresponding power source system needs to be connected externally, which makes the overall structure complex and leads to an increase in the overall cost. In summary, in the embodiments of the present application, an electric push rod is generally used as the driving mechanism 6 of the driving ring 1, so as to drive and control the rotation state of the driving ring 1 through the electric push rod, which can meet the requirement that the electric push rod is provided with electric energy and control signals by the control system of the range hood, so that the overall structure is simplified.

[0061] Under the condition that the hydraulic pump station or the air compressor is matched in the setting scene, the corresponding driving mechanism 6 can be selected according to the user's demand to meet the requirement of controlling the rotation state of the driving ring 1.

[0062] The low-resistance range hood check valve provided in the present application drives the driving ring guide groove 11 to rotate synchronously through the rotation of the driving ring 1, so as to drive the slider 2 to move through the driving ring guide groove 11, and then realizes the push-pull action of the valve plate 4 through the connecting rod 3, meets the requirement of conducting or cutting off the pipeline passage, and avoids the movement trend of the valve plate 4 being closed on the fixed base 5 due to the weight or the action of the torsional spring, effectively ensures that the pressure loss of the fan pressure will not be caused in the open state, and improves the effect of the range hood on sucking and discharging the oil fume.

[0063] At the same time, when the valve plate 4 is opened, the connecting rod 3 has the traction and limiting effect on the valve plate 4, so that the valve plate 4 will not be adhered due to the attachment of oil stains, which will cause the valve plate 4 to be unable to be normally opened, and effectively improves the stability of the overall working state of the check valve.

[0064] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0065] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0066] In addition, the terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0067] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be connected, or detachable, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0068] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0069] In the description of the application, reference to "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the above expressions in various places in the description are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the terms "first", "second", "third", etc. are used herein merely as identifiers that identify a particular order or pattern, rather than to denote a physical, logical, and / or chronological order or pattern. Furthermore, the terms "comprise", "comprising", "include", "including", and the like, specify the presence of stated features, structures, materials, and / or characteristics, but do not preclude the presence or addition of one or more other features, structures, materials, and / or characteristics.

[0070] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the application. Accordingly, such modifications and changes are intended to fall within the scope of the application as defined by the appended claims and their equivalents.

[0071] The above descriptions are specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A low resistance range hood check valve, characterized in that: include: A drive ring, a slider, a connecting rod, and a valve plate, wherein the inner ring of the drive ring is provided with a plurality of drive ring guide grooves, one end of the slider is embedded in the drive ring guide groove, the other end of the slider is connected to the connecting rod, and the end of the connecting rod passes through the through hole at the end of the valve plate; wherein, A driving ring is rotatably mounted on the fixed base, wherein an angle is formed between the guide groove of the driving ring and the slider; The slider is embedded in the guide groove of the driving ring through a guide block at one end and moves along the guide groove of the driving ring, and moves along the radial direction of the fixed base through a guide structure at the other end; A connecting rod, with a limit block provided at the end thereof, wherein the size of the limit block is larger than the through hole of the valve plate, and the limit block is in movable contact with the valve plate; The end of the valve plate is rotatably connected to the fixed base through a fixed shaft.

2. The low-resistance range hood check valve according to claim 1, characterized in that: The guide structure includes: a base guide groove and a guide pin, wherein the guide pin is embedded in the base guide groove; wherein, A base guide groove extending along a radial direction of the fixed base; The guide pin is arranged on the bottom surface of the slider.

3. The low-resistance range hood check valve according to claim 1, characterized in that: A connecting rod is provided at one end of the sliding block, and the connecting rod is connected to the connecting rod.

4. The low-resistance range hood check valve according to claim 3, characterized in that: The connecting rod and the connecting rod are rotatably connected via a spherical joint.

5. The low-resistance range hood check valve according to claim 1, characterized in that: The through hole is a strip-shaped hole, which extends along the radial direction of the fixed base. The connecting rod passes through the strip-shaped hole and moves along the direction of the strip-shaped hole.

6. The low-resistance range hood check valve according to claim 5, characterized in that: The front end of the connecting rod is bent in a direction away from the valve plate.

7. The low-resistance range hood check valve according to any one of claims 1 to 6, characterized in that: The valve plates are distributed on the fixed base at equal distances around the circumference of the central axis of the fixed base.

8. The low-resistance range hood check valve according to claim 1, characterized in that: The driving ring is connected to a power mechanism. A driving connecting handle is provided on the driving ring. The driving connecting handle is connected to an output end of the power mechanism.

9. The low-resistance range hood check valve according to claim 8, characterized in that: The drive connecting handle is arranged on the outer side wall of the drive ring, and a drive groove is arranged on the side wall of the fixed base corresponding to the drive connecting handle. The drive connecting handle passes through the drive groove and is connected to the output end of the power mechanism.

10. The low-resistance range hood check valve according to claim 8 or 9, characterized in that: The power mechanism adopts an electric push rod, an oil cylinder or an air cylinder.

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