Low-resistance check valve for range hood

Abstract

The low-resistance range hood check valve comprises a driving ring, a longitudinal guide ring, connecting rods and a valve plate, the longitudinal guide ring is arranged in an inner ring of the driving ring, the valve plate is arranged in the inner ring of the driving ring, a plurality of inclined guide grooves are formed in the positions, corresponding to the connecting rods, of the driving ring, and a plurality of longitudinal guide grooves are formed in the positions, corresponding to the connecting rods, of the longitudinal guide ring. The connecting rod sequentially penetrates through the oblique guide groove and the longitudinal guide groove and is hinged to the valve plate. According to the low-resistance check valve for the range hood, through rotation of the driving ring and matching and limiting of the oblique guide groove and the longitudinal guide groove, the connecting rod moves up and down, the valve plate is dragged to be switched between the opening state and the closing state, and the requirement for conducting or cutting off a pipeline channel is effectively met; the movement trend that the valve plate covers the fixed base due to the dead weight or the torsion 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 which is not 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 technical problem that the valve plate cannot be completely opened in the prior art by relying on the wind pressure to drive the valve plate to open, and by 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 longitudinal guide ring, a connecting rod, and a valve plate, the longitudinal guide ring is arranged in the inner ring of the driving ring, the valve plate is arranged in the inner ring of the driving ring, a plurality of oblique guide grooves are arranged on the driving ring corresponding to the connecting rod, a plurality of longitudinal guide grooves are arranged on the longitudinal guide ring corresponding to the connecting rod, the connecting rod sequentially passes through the oblique guide grooves and the longitudinal guide grooves and is hinged to the valve plate; wherein,

[0007] The driving ring is rotatably arranged on the fixed base, the cylindrical surface of the driving ring extends upward, and the oblique guide grooves are arranged on the cylindrical surface of the driving ring.

[0008] The longitudinal guide ring is fixedly arranged on the fixed base and does not rotate with the driving ring.

[0009] The connecting rod is provided with a limiting block at one end and is hinged to the valve plate at the other end, and the limiting block is in movable contact with the outer side wall of the driving ring.

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

[0011] Further, the side wall of the driving ring is in inverted U-shaped structure, and the oblique guide grooves are arranged on the side of the inverted U-shaped structure facing the inner ring of the driving ring.

[0012] Further, the limiting block of the connecting rod is located in the internal groove surrounded by the inverted U-shaped structure of the driving ring.

[0013] Further, the outer edge of the fixed base is provided with a boss, and the driving ring and the longitudinal guide ring are arranged on the boss respectively.

[0014] Further, the center of the valve plate is provided with a valve plate groove, the valve plate groove is provided with a hinge shaft, and the hinge shaft passes through the end of the connecting rod.

[0015] Further, the fixed base is provided with a shaft seat in pairs, and the two ends of the fixed shaft respectively pass through the center hole of the shaft seat.

[0016] Further, the valve plate is equally distributed on the fixed base around the central shaft of the fixed base.

[0017] Further, the driving ring is connected with a power mechanism, the driving ring is provided with a driving connection handle, and the driving connection handle is connected with the output end of the power mechanism.

[0018] Further, the driving connection 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 connection handle, the driving connection handle passes out of the driving groove and is connected with the output end of the power mechanism.

[0019] Further, the power mechanism adopts an electric push rod, an oil cylinder or a gas cylinder.

[0020] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0021] The low-resistance range hood check valve provided by the present application can effectively avoid the valve plate from sticking to the fixed base due to gravity or the action of the torsional spring, effectively ensure that the valve plate does not block the fan wind pressure in the open state, cause pressure loss, and improve the effect of the range hood on sucking and exhausting oil fumes.

[0022] At the same time, when the valve plate is opened, the valve plate will not stick due to oil stains adhered to the valve plate, thereby effectively improving the stability of the overall working state of the check valve. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.

[0025] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings, which do not constitute a limitation to the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified. The drawings in the drawings do not constitute a proportional limitation.

[0026] Figure 1 A structural schematic diagram of a low-resistance range hood check valve provided by the embodiments of the present application.

[0027] Figure 2 A structural schematic diagram of the removal of the longitudinal guide ring.

[0028] Figure 3 A structural schematic diagram of the removal of the longitudinal guide ring and the driving ring.

[0029] Explanation of reference numerals:

[0030] 1. Drive ring; 11. Oblique guide groove; 12. Drive connecting handle; 2. Longitudinal guide ring; 21. Longitudinal guide groove; 3. Connecting rod; 31. Limit block; 4. Valve plate; 41. Fixed shaft; 42. Valve plate groove; 5. Fixed base; 51. Shaft seat; 52. Drive groove; 6. Power mechanism. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0033] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0034] In order to solve the technical problem that the valve plate cannot be completely opened in the prior art, which causes the airflow in the pipeline to be blocked, the air pressure in the pipeline is reduced, and the suction effect on oil fume is affected, the application provides a low-resistance range hood check valve, which can realize the lifting of the connecting rod during the rotation of the driving ring, thereby pulling the valve plate to rotate around the fixed shaft, so as to realize the opening and closing of the valve plate, and the inclined guide groove and the longitudinal guide groove provide limiting for the connecting rod, avoid the movement trend of the valve plate to be reset and closed, so that the valve plate does not interfere with the suction work of the air pressure, the problem of pressure loss can be effectively avoided, and the effect of sucking oil fume is stable and reliable.

[0035] Please refer to Figure 1 、 Figure 2 , and Figure 3 , the low-resistance range hood check valve provided by the application comprises a driving ring 1, a longitudinal guide ring 2, a connecting rod 3 and a valve plate 4, the longitudinal guide ring 2 is arranged in the inner ring of the driving ring 1, the valve plate 4 is arranged in the inner ring of the driving ring 1, a plurality of inclined guide grooves 11 are arranged on the driving ring 1 corresponding to the connecting rod 3, a plurality of longitudinal guide grooves 21 are arranged on the longitudinal guide ring 2 corresponding to the connecting rod 3, the connecting rod 3 sequentially passes through the inclined guide grooves 11 and the longitudinal guide grooves 21 and is hinged to the valve plate 4, and wherein:

[0036] The driving ring 1 is rotatably arranged on a fixed base 5, the cylindrical surface of the driving ring 1 extends upward, and the inclined guide grooves 11 are arranged on the cylindrical surface of the driving ring 1.

[0037] The longitudinal guide ring 2 is fixedly arranged on the fixed base 5 and does not rotate with the driving ring 1.

[0038] The connecting rod 3 has a limiting block 31 arranged at one end and is hinged to the valve plate 4 at the other end, and the limiting block 31 is in movable contact with the outer side wall of the driving ring 1.

[0039] The valve plate 4 is rotatably connected to the fixed base 5 through a fixed shaft 41.

[0040] In normal state, the valve plate 4 is in closed state and covers the pipeline passage in the center of the fixed base 5, so as to cut 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 drops adhered and condensed in the pipeline passage from falling into the range hood. When it is needed to open the check valve to suck the oil fume by the fan, the driving ring 1 is rotated, so that the inclined guide groove 11 on the driving ring 1 is rotated with the driving ring 1. Since the connecting rod 3 passes through the inclined guide groove 11, the connecting rod 3 moves relatively along the inclined guide groove 11 during the rotation of the driving ring 1. At the same time, since the longitudinal guide groove 21 provides limiting for the left and right sides of the connecting rod 3, the connecting rod 3 moves up and down along the longitudinal guide groove 21 on the fixed longitudinal guide plate under the driving of the inclined guide groove 11. When the connecting rod 3 moves up, it pulls the valve plate 4, so as to turn the valve plate 4 up and open the pipeline passage, which is convenient for the fan to suck the oil fume by the wind pressure.

[0041] In the open state, the inclined guide groove 11 and the longitudinal guide groove 21 respectively provide limiting for the up and down and left and right directions of the connecting rod 3, so as to fixedly support the connecting rod 3, avoid the reset movement trend of the valve plate 4 under the gravity and the like, and further prevent the valve plate 4 from being deviated to hinder the airflow in the pipeline passage, so as to ensure that the pressure generated by the fan is not reduced due to the hindrance, and ensure that the suction effect of the fan on the oil fume is stable and reliable.

[0042] At the same time, in the embodiments provided in the application, when the driving ring 1 rotates, the connecting rod 3 is moved by the inclined guide groove 11, and the left and right directions of the connecting rod 3 are limited by the longitudinal guide groove 21 of the longitudinal guide ring 2 fixedly arranged on the fixed base 5, so that the connecting rod 3 moves up along the longitudinal guide groove 21 to pull the valve plate 4 to turn up, so as to realize the conduction of the pipeline passage. In this process, since the connecting rod 3 exerts pulling external force on the valve plate 4, even if there is oil dirt with high viscosity adhered to the surface of the valve plate 4, the valve plate 4 is not easy to be adhered, so as to effectively ensure that the valve plate 4 can be normally opened and closed, and improve the overall service life of the check valve and the range hood.

[0043] When closing, the driving ring 1 is reversely rotated, so as to relatively move the connecting rod 3 in the opposite direction by the inclined guide groove 11, so that the connecting rod 3 moves down along the longitudinal guide groove 21 to push the valve plate 4 to rotate downward around the fixed shaft 41, and make the valve plate 4 cover the pipeline passage to cut off the pipeline passage, so as to realize the closing of the check valve. In the closed state, the movement of the connecting rod 3 is limited by the cooperation of the inclined guide groove 11 and the longitudinal guide groove 21, so that the connecting rod 3 is in a fixed state, thereby avoiding that the valve plate 4 is accidentally opened in the closed state due to external force, and effectively ensuring the sealing property of the check valve.

[0044] In some embodiments, the side wall of the driving ring 1 is in inverted U-shaped structure, and the oblique guide groove 11 is arranged on the side of the inverted U-shaped structure facing the inner ring of the driving ring 1. By using the side wall of the inverted U-shaped structure, it is ensured that the oblique guide groove 11 does not cause the inside and outside of the check valve to be in communication, avoiding the situation that the air pressure generated by the fan leaks due to the oblique guide groove 11, and improving the stability of the fan in the state of sucking oil fume.

[0045] In some embodiments, the limiting block 31 of the connecting rod 3 is located in the internal groove formed by the inverted U-shaped structure of the driving ring 1. By arranging the limiting block 31 in the internal groove of the inverted U-shaped structure, the limiting block 31 is limited by the outer side wall of the inverted U-shaped structure, avoiding excessive movement of the connecting rod 3, ensuring that the trajectory of the connecting rod 3 driving the valve plate 4 to move remains on the set path, ensuring the stability of the position of the valve plate 4 in the open and closed states, and preventing the situation that the air pressure in the pipeline passage is affected due to the deflection of the valve plate 4.

[0046] In some embodiments, the center of the valve plate 4 is provided with a valve plate groove 42, and a hinge shaft is arranged in the valve plate groove 42, and the hinge shaft penetrates the end of the connecting rod 3. When the connecting rod 3 pulls the valve plate 4 to move, the end of the connecting rod 3 and the valve plate 4 will relatively rotate within a certain angle range. By arranging the valve plate groove 42 on the valve plate 4 and arranging the hinge shaft in the valve plate groove 42, when the connecting rod 3 relatively rotates with the valve plate 4, the end of the connecting rod 3 can move in the valve plate groove 42 and will not collide or interfere with the valve plate 4.

[0047] In some embodiments, the fixed base 5 is provided with a pair of shaft seats 51, and the two ends of the fixed shaft 41 respectively penetrate the center holes of the shaft seats 51. By arranging the shaft seats 51 to limit and support the fixed shaft 41, the flipping movement of the valve plate 4 can be kept on a relatively stable path, avoiding the influence of the deflection of the valve plate 4 due to the deflection of the fixed shaft 41, so that the position of the valve plate 4 in the open or closed state is deviated, and then the stability of the suction pressure of oil fume in the pipeline passage is affected.

[0048] In some embodiments, the valve plate 4 is circumferentially equidistantly distributed on the fixed base 5 around the center axis of the fixed base 5. When the valve plate 4 is in the closed state, the side edges of adjacent valve plates 4 can be adhered, and the ends of the valve plates 4 meet at the center line of the fixed base 5, satisfying the truncation and covering effect of the pipeline passage.

[0049] 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 then the driving link 3 moves in the up-down direction along the longitudinal guide shaft through the cooperation between the oblique guide groove 11 and the longitudinal guide groove 21, and the valve plate 4 is switched between opening and closing.

[0050] 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.

[0051] 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, arranging the power mechanism 6 outside can facilitate the installation, debugging, maintenance and replacement of the power mechanism 6, thereby improving the overall convenience of work.

[0052] 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:

[0053] 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 send corresponding control signals to the electric push rod to realize the driving control of the electric push rod.

[0054] 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. In addition, because 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.

[0055] The principle and structure of a pneumatic cylinder are relatively simple, consisting primarily of basic components such as the cylinder barrel, piston, piston rod, and end caps. These components are easy to manufacture, maintain, and install. Furthermore, due to the low viscosity and flow resistance of air during operation, the cylinder operates quickly, enabling rapid response. The cylinder itself is relatively inexpensive, and the cost of obtaining compressed air is low, meeting the overall cost control requirements of the structure.

[0056] 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 scenario of using the range hood, there is generally no hydraulic pump station or air compressor. Therefore, in actual work, an external corresponding power source system is required, which makes the overall structure complicated and leads to an increase in the overall cost. As mentioned above, in the embodiment of the present application, an electric push rod is generally used as the power mechanism 6 of the drive ring 1, so that the rotation state of the drive ring 1 is driven and controlled by the electric push rod, which can meet the needs of providing power and control signals to the electric push rod through the range hood control system, making the overall structure simpler.

[0057] Under the condition that there is a matching hydraulic pump station or air compressor in the setting scene, the corresponding power mechanism 6 can be selected according to user needs to meet the demand for controlling the rotation state of the drive ring 1.

[0058] In some embodiments, the outer edge of the fixed base 5 is provided with a boss, and the drive ring 1 and longitudinal guide ring 2 are respectively mounted on the boss. In some specific embodiments, the boss is provided with a clearance gap corresponding to the range of motion of the drive connecting handle 12 to prevent interference with the movement of the drive connecting handle 12. Furthermore, by elevating the drive ring 1 and longitudinal guide ring 2 via the boss, the material used for the drive ring 1 and longitudinal guide ring 2 at the height of the boss can be reduced. Because the drive ring 1 rotates back and forth during operation, friction occurs between the connecting rod 3 and the oblique guide groove 11 and the longitudinal guide groove 21 during this process. Therefore, over long periods of operation, the oblique guide groove 11, the longitudinal guide groove 21, and the connecting rod 3 are susceptible to wear. When wear is severe, the corresponding components generally need to be replaced. The provision of the boss provides a stop for the assembly of the drive ring 1 and longitudinal guide ring 2 when they are replaced, while also saving material costs and meeting assembly positioning and cost control requirements.

[0059] The low-resistance range hood check valve provided by the application can realize the needs of opening or cutting off the pipeline passage by rotating the driving ring 1 to make the inclined guide groove 11 and the connecting rod 3 move relatively, and under the guidance of the longitudinal guide groove 21 on the longitudinal guide ring 2, the connecting rod 3 moves up and down, thereby pushing and pulling the valve plate 4 to rotate around the fixed shaft 41. At the same time, the movement trend of the valve plate 4 being closed on the fixed base 5 due to the weight or the torsional spring can be effectively avoided, the pressure loss caused by the valve plate 4 blocking the air pressure of the fan in the open state is effectively ensured, and the effect of the range hood on sucking and exhausting the oil fume is improved.

[0060] At the same time, when the valve plate 4 is opened, the connecting rod 3 has a traction pulling effect on the valve plate 4, so that the valve plate 4 cannot be adhered due to the oil stains attached to the valve plate 4, thereby effectively improving the stability of the overall working state of the check valve.

[0061] 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.

[0062] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0063] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0064] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, 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 an intermediate medium; it can be the internal communication of two elements or the 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.

[0065] In this application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature with respect to a 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, "on", "above" and "over" of a first feature with respect to a second feature include that the first feature is directly above and obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. "Under", "below" and "underneath" of a first feature with respect to a second feature include that the first feature is directly below and obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

[0066] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. The illustrative representations of the above terms in the specification should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In addition, a person skilled in the art can combine and combine different embodiments or examples described in the specification.

[0067] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, these modifications and variations of the present application, which are within the scope of the claims of the present application and their equivalents, are intended to be included in the scope of the present application.

[0068] The above is a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in 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 longitudinal guide ring, a connecting rod, and a valve disc, wherein the longitudinal guide ring is disposed in the inner ring of the drive ring, and the valve disc is disposed in the inner ring of the drive ring. The drive ring is provided with a plurality of oblique guide grooves corresponding to the connecting rod, and the longitudinal guide ring is provided with a plurality of longitudinal guide grooves corresponding to the connecting rod. The connecting rod passes through the oblique guide grooves and the longitudinal guide grooves in sequence and is hinged to the valve disc; in, A driving ring is rotatably mounted on the fixed base, wherein the cylindrical surface of the driving ring extends upward, and the oblique guide groove is disposed on the cylindrical surface of the driving ring; The longitudinal guide ring is fixed on the fixed base and does not rotate with the driving ring; A connecting rod, one end of which is provided with a limit block, and the other end is hinged to the valve plate, and the limit block is in movable contact with the outer side wall of the driving ring; 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 cross section of the side wall of the driving ring is an inverted U-shaped structure, and the oblique guide groove is arranged on a side of the inverted U-shaped structure facing the inner ring of the driving ring.

3. The low-resistance range hood check valve according to claim 2, characterized in that: The limiting block of the connecting rod is located in an inner groove surrounded by the inverted U-shaped structure of the driving ring.

4. The low-resistance range hood check valve according to claim 1, characterized in that: A boss is provided on the outer edge of the fixed base, and the driving ring and the longitudinal guide ring are respectively provided on the boss.

5. The low-resistance range hood check valve according to claim 1, characterized in that: A valve plate groove is provided at the center of the valve plate, a hinge shaft is provided in the valve plate groove, and the hinge shaft passes through the end of the connecting rod.

6. The low-resistance range hood check valve according to claim 1, characterized in that: The fixed base is provided with shaft seats in pairs, and both ends of the fixed shaft pass through the center holes of the shaft seats respectively.

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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