Range hood air outlet cover and range hood

Abstract

The present invention relates to an air outlet hood for a range hood and the range hood, wherein the air outlet hood comprises: a hood body; a valve plate; a vibration-assisted opening structure provided on the valve plate for assisting the valve plate in opening, the vibration-assisted opening structure comprising: a movable channel, wherein a movable part capable of reciprocating along its extension direction is provided in the movable channel; an upstream pressure-inducing flow channel connected to a first movable section of the movable channel; a downstream pressure-inducing flow channel connected to a second movable section of the movable channel; a first elastic part and a second elastic part acting on both ends of the movable part; a pressure relief channel provided on the movable part, wherein the movable part can reciprocate along the extension direction of the movable channel according to the pressure difference between upstream and downstream of the valve plate when the pressure relief channel of the movable part is connected to the upstream pressure-inducing flow channel and the downstream pressure-inducing flow channel. The unstable working conditions of the fan and the external environment cause fluctuations in the pressure difference between upstream and downstream of the valve plate, so that the movable part (similar to a spring oscillator) on the valve plate performs simple harmonic motion, effectively overcoming the resistance of oil and dirt adhesion, making it easier to open.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to an air outlet hood for a range hood and the range hood. Background Art

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate based on the principles of fluid dynamics, using a centrifugal fan installed inside the hood to draw in and exhaust cooking fumes, while a filter removes some grease particles. A centrifugal fan consists of a volute, an impeller mounted within the volute, and a motor that drives the impeller. As the impeller rotates, negative pressure is generated at the fan's center, drawing cooking fumes from beneath the hood into the fan. After being accelerated by the fan, the volute collects them and guides them out of the room.

[0003] The range hood's air hood and exhaust pipe are essential components of the range hood, conveying oil fumes to the building's shared flue. The air hood's primary function is to rectify the airflow within the volute, moderately decelerating and increasing its pressure, before conveying it through the exhaust pipe to the shared flue. To prevent backflow of oil fumes after exiting the range hood, current range hoods typically feature a check valve inside the air hood to prevent backflow of oil fumes when the range hood is not in use. When the range hood is not in use, the valve automatically closes under the influence of gravity, preventing the backflow of oil fumes. Although this design can prevent the backflow of oil smoke, since the air outlet hood is located in the flow channel, when the range hood has been operating for a certain period of time, a large amount of condensed oil will appear on the non-return valve. If the ambient temperature is low, or the user does not use the range hood frequently, when the air outlet hood is closed, the condensed oil on the non-return valve will bond the non-return valve to the rubber pad. If the bonding area is large, or the air pressure of the range hood itself is not high, the non-return valve will never be able to open, seriously affecting the operation of the range hood. Currently, range hood manufacturers are constantly pursuing high air volume and high air pressure to achieve better oil smoke extraction effects, and use high air pressure to forcibly blow open the non-return valve. In order to obtain a better user experience, the existing technology generally obtains better oil smoke extraction effects by increasing the size of components such as the air duct, impeller, and motor, and improving motor performance. This not only increases costs and wastes resources, but also does not solve the fundamental problem. At the same time, if the size of the components is increased, it will affect the kitchen design.

[0004] To this end, the Chinese invention patent application with application number CN202010180792.0 (authorization publication number: CN111288521B) discloses an air outlet hood, including a hollow hood body, a check valve disc rotatably arranged at the outlet of the hood body, and a sealing ring arranged below the check valve disc and in contact with the check valve disc. The air outlet hood also includes an auxiliary device capable of assisting the opening of the check valve disc. The auxiliary device includes a first pressure-introducing channel for taking the pressure of the gas outside the hood body, a second pressure-introducing channel for taking the pressure of the gas inside the hood body, a drainage channel connected to the outside of the air outlet hood, and a pressure valve. The first pressure-introducing channel and the second pressure-introducing channel are connected. The pressure valve is arranged in the second pressure-introducing channel and can move up and down according to the pressure difference between the external gas pressure and the internal gas pressure to connect or disconnect the second pressure-introducing channel and the drainage channel. The auxiliary device also includes an impeller that is driven to rotate by the airflow in the drainage channel when the second pressure-introducing channel and the drainage channel are connected, and a transmission ring that is driven to rotate by the impeller, and the transmission ring is connected to the outer periphery of the sealing ring.

[0005] However, the air outlet hood in the above-mentioned patent application still has certain shortcomings. In this patent application, the pressure difference between the upstream and downstream of the valve plate is used to drive the pressure valve to open. The air is discharged to the fan frame through the drainage channel. The rapid airflow in the drainage channel drives the impeller to rotate, and then drives the sealing ring (which cooperates with the valve plate) to move, thereby achieving the purpose of assisting the valve plate to open. However, after long-term use, oil and dirt will inevitably accumulate at the contact point between the sealing ring and the cover body, causing the sealing ring to adhere to the surface of the cover body. This requires a large driving force to move it. If the impeller rotating with the airflow is used as the driving force, the driving force is limited, resulting in the failure of the sealing ring to rotate and the purpose of effectively assisting the valve plate to open. On the other hand, the connection or disconnection between the second pressure-introducing channel and the drainage channel is achieved by the pressure difference between the external gas pressure and the internal gas pressure, which drives the pressure valve located in the pressure-introducing channel to move up and down. After long-term contact with oil smoke, the pressure valve is adhered by oil and dirt and may not fall back naturally under its own weight, causing the pressure valve to fail to open and close. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide an air outlet hood for a range hood that can effectively reduce the risk of failure of the valve opening auxiliary action in response to the current status of the existing technology.

[0007] The second technical problem to be solved by the present invention is to provide a range hood using the above-mentioned air outlet hood in view of the current status of the existing technology.

[0008] The technical solution adopted by the present invention to solve the first technical problem is: an air outlet cover for a range hood, comprising:

[0009] The cover body is hollow inside to form an air outlet channel for air flow to pass through;

[0010] A valve plate is rotatably disposed in the air outlet passage of the cover body and opens or closes the air outlet passage;

[0011] The valve disc further comprises a vibration-assisted opening structure provided on the valve disc for assisting the valve disc in opening. The vibration-assisted opening structure comprises:

[0012] A movable channel is provided on the valve plate, wherein a movable member capable of reciprocating along an extension direction thereof is provided in the movable channel, wherein the movable member divides the movable channel into a first movable section and a second movable section, and wherein the extension direction of the movable channel is opposite to the first direction and the second direction;

[0013] An upstream pressure-inducing flow channel, used for obtaining the pressure of the air outlet channel corresponding to the upstream of the valve plate, and communicating with the first movable section of the movable channel;

[0014] A downstream pressure-inducing flow channel is used to obtain the pressure of the air outlet channel corresponding to the downstream of the valve plate and is connected to the second movable section of the movable channel;

[0015] a first elastic member acting on the movable member and causing the movable member to always have a tendency to move along a first direction;

[0016] a second elastic member acting on the movable member and causing the movable member to always have a tendency to move along the second direction;

[0017] The movable part is provided with a pressure relief channel that can connect the upstream pressure-inducing flow channel and the downstream pressure-inducing flow channel. When the pressure relief channel of the movable part is connected to the upstream pressure-inducing flow channel and the downstream pressure-inducing flow channel, the movable part can move back and forth along the extension direction of the movable channel according to the pressure difference change between upstream and downstream of the valve plate.

[0018] In order to achieve stable sliding of the movable part in the movable channel, thereby ensuring that the movable part can flexibly connect or disconnect the upstream pressure-inducing flow channel and the downstream pressure-inducing flow channel, the movable part is cylindrical as a whole, and the movable channel is a cylindrical hole adapted to the movable part. The pressure relief channel on the movable part has a first port for connecting with the upstream pressure-inducing flow channel and a second port for connecting with the downstream pressure-inducing flow channel. At least one of the first port and the second port of the pressure relief channel is opened on the outer peripheral wall of the movable part, so that the pressure relief channel can be connected and closed during the reciprocating movement of the movable part along the extension direction of the movable channel.

[0019] To simplify the structure of the movable part and facilitate processing, the pressure relief channel on the movable part is L-shaped. That is, the first port of the pressure relief channel is opened at the end of the movable part, and the second port is opened on the outer peripheral wall of the movable part. During the movement of the movable part along the extension direction of the movable channel, the port located on the outer peripheral wall of the movable part can be blocked or opened.

[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 movable member structure that moves in the movable channel, the first elastic member is a first spring arranged in the first movable section of the movable channel, and the second elastic member is a second spring arranged in the second movable section of the movable channel. In a natural state, the movable member is in a state of disconnecting the pressure relief channel under the joint action of the first spring and the second spring.

[0021] In order to enhance the vibration intensity of the valve plate, the extension direction of the active channel is consistent with the extension direction of the air outlet channel of the cover body. The valve plate is provided with two vibration-assisted opening structures arranged at intervals. The two vibration-assisted opening structures are respectively recorded as the first vibration-assisted opening structure and the second vibration-assisted opening structure. The active channel, active part and pressure relief channel of the first vibration-assisted opening structure are respectively recorded as the first active channel, the first active part and the first pressure relief channel. The active channel, active part and pressure relief channel of the second vibration-assisted opening structure are respectively recorded as the second active channel, the second active part and the second pressure relief channel. The first movable part and the second movable part are linked by a connecting rod, so that the first pressure relief channel and the second pressure relief channel can be opened or closed synchronously.

[0022] By using the two vibration-assisted opening structures that can vibrate synchronously, the vibration intensity of the movable parts of the two vibration-assisted opening structures is mutually reinforced, thereby making it easier for the valve plate to open relative to the cover body, thereby playing a better opening-assisted role.

[0023] Since the thickness of the valve plate itself is limited and insufficient to install the above-mentioned elastic parts, movable parts and other components, the valve plate has a first side wall facing the air flow and a second side wall away from the air flow, and the second side wall of the valve plate has two first mounting seats and second mounting seats that protrude outward relative to the second side wall. The first mounting seat defines the first movable channel, and the second mounting seat defines the second movable channel. The first mounting seat is provided with a first limiting slide that passes from the outside to the inside to the first movable channel and is consistent with the extension direction of the first movable channel. The second mounting seat is provided with a first limiting slide that passes from the outside to the inside to the second movable channel. The first movable member has a first pin extending outwardly and slidably arranged in the first limiting slideway, and the second movable member has a second pin extending outwardly and slidably arranged in the second limiting slideway. The connecting rod is hinged at its middle portion on the second side wall of the valve plate. The first end of the connecting rod has a first linear slide extending along the length direction of the connecting rod and capable of sliding the first pin therein. The second end of the connecting rod has a second linear slide extending along the length direction of the connecting rod and capable of sliding the second pin therein.

[0024] The connecting rod, the first vibration-assisted opening structure and the second vibration-assisted opening structure together constitute a vibration-assisted opening structure assembly.

[0025] The swinging connecting rod is connected to the first movable member and the second movable member, thereby ensuring that the two movable members can move stably and synchronously, avoiding the problem of jamming.

[0026] Generally speaking, the two vibration-assisted opening structures can be set at any two areas on the valve plate. For the convenience of installation, the extension direction of the connecting rod is basically parallel to the rotation axis direction of the valve plate around the cover body.

[0027] In order to obtain the pressure upstream and downstream of the valve plate more conveniently and timely, the first active section of the first active channel is located below the first active channel, and the first active section of the second active channel is located above the second active channel. A first pressure inlet is provided on the first side wall of the valve plate, and the first pressure inlet is connected to the first active section of the first active channel through the upstream pressure inlet channel of the first vibration-assisted opening structure. A second pressure inlet is also provided on the first side wall of the valve plate, and the second pressure inlet is connected to the first active section of the second active channel through the upstream pressure inlet channel of the second vibration-assisted opening structure.

[0028] In order to adapt to the conventional two valve disc structure and ensure that both valve discs can be opened simultaneously under the action of the corresponding vibration-assisted opening structure, the valve discs are symmetrically arranged, and each valve disc is provided with the vibration-assisted opening structure component.

[0029] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a range hood, comprising a body, an air outlet hood and a fan system arranged in the body, the air outlet hood being fluidically connected to the fan system, and the air outlet hood being the air outlet hood for the above-mentioned range hood.

[0030] Compared with the prior art, the advantages of the present invention are as follows: the vibration-assisted opening structure provided on the valve plate in the present invention cleverly utilizes the unstable working conditions of the fan and the external environment to cause fluctuations in the pressure difference between the upstream and downstream of the valve plate, so that the movable part of the vibration-assisted opening structure on the valve plate (similar to a spring oscillator) performs simple harmonic motion. Since the valve plate itself will also vibrate accordingly, when the vibration frequencies of the two are the same, the vibration intensity can be effectively enhanced, which can effectively overcome the resistance of oil and dirt adhesion, thereby playing a better valve plate opening-assisting function. The air outlet hood structure does not require additional energy input and can achieve the purpose of valve plate opening assistance by relying on the wind force of the range hood itself. The design is clever and the structure is simple, which improves the stability of the air outlet hood operation, ensures the anti-return function of the air outlet hood valve plate, and enhances the smoke exhaust capacity of the range hood. On the other hand, since the frequency generated by the vibration-assisted opening structure is relatively single, it can emit a specific sound to indicate the working status of the air outlet hood, making it easier to identify when performing fault diagnosis, and can help maintenance personnel quickly locate the problem, greatly improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the three-dimensional structure of the air outlet cover according to an embodiment of the present invention;

[0032] Figure 2 for Figure 1 Cross-sectional view at point AA (the valve is in the state of not blocking the air outlet channel);

[0033] Figure 3 for Figure 1 Cross-sectional view at AA in the middle (the valve is in the state of blocking the air outlet channel, wherein the airflow is in an undisturbed state);

[0034] Figure 4 for Figure 1 Cross-sectional view at AA in the middle (the valve plate is in a state of blocking the air outlet channel, wherein the airflow is in a disturbed state);

[0035] Figure 5 Schematic diagram of the three-dimensional structure of the valve plate according to an embodiment of the present invention;

[0036] Figure 6is a schematic diagram of the three-dimensional structure of a range hood according to an embodiment of the present invention;

[0037] Figure 7 2 is a cross-sectional view of a range hood according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0039] In the present specification and claims, directional terms such as "front," "back," "up," "down," "left," "right," "side," "top," and "bottom" are used to describe various exemplary structural parts and components of the present invention. However, these terms are used herein for convenience of description only and are based on the exemplary orientations shown in the accompanying drawings. Because the embodiments disclosed herein can be arranged in various orientations, these directional terms are intended for illustrative purposes only and should not be construed as limiting. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0040] See also Figure 1-Figure 7 , an air outlet hood for a range hood, which is used to be connected to the air outlet of the range hood and to be connected to an external smoke exhaust pipe. The air outlet hood includes a hood body 10 and a valve plate 20 rotatably arranged in the hood body 10. The interior of the hood body 10 is hollow to form an air outlet channel 11 for air flow to pass through, and the cross-section of the air outlet channel 11 is generally circular. There are generally two valve plates 20, and the two valve plates 20 are symmetrically arranged in the air outlet channel 11 of the hood body 10, and jointly deflect to open or close the air outlet channel 11 of the hood body 10. Specifically, the middle part of the air outlet channel 11 of the hood body 10 has a laterally extending rotating shaft 200, and the two valve plates 20 are both semicircular, and the two are assembled together to form a circular plate structure, and the straight edges of the two valve plates 20 are rotatably connected to the hood body 10 through the above-mentioned rotating shaft 200. When the range hood is in operation, the two valve plates 20 are deflected upward by wind pressure to open the air outlet channel 11. When the range hood is turned off, the two valve plates 20 are deflected downward by elastic members or their own gravity to close the air outlet channel 11. The above-mentioned air outlet cover structure and working process are prior art.

[0041] When the range hood has been working for a certain period of time, the condensed oil on the valve plate 20 will stick the non-return valve plate 20 to the rubber pad. If the bonding area is large, or the wind pressure of the range hood itself is not large, the non-return valve plate 20 will never be able to open, seriously affecting the operation of the range hood. For this reason, the valve plate 20 of this embodiment is also provided with a vibration-assisted opening structure for assisting the valve plate 20 to open. Specifically, there are two vibration-assisted opening structures, which are respectively recorded as the first vibration-assisted opening structure 31 and the second vibration-assisted opening structure 32. The first vibration-assisted opening structure 31 and the second vibration-assisted opening structure 32 are linked by a connecting rod 60 hinged on the valve plate 20, that is, the connecting rod 60, the first vibration-assisted opening structure 31 and the second vibration-assisted opening structure 32 together constitute a vibration-assisted opening structure component of the valve plate 20, see Figure 1 .

[0042] Each valve disc 20 has a first sidewall 21 facing the incoming airflow and a second sidewall 22 facing away from the incoming airflow. The second sidewall 22 of the valve disc 20 has a first mounting seat 23 and a second mounting seat 24, both of which protrude outward from the second sidewall 22. The first mounting seat 23 and the second mounting seat 24 are spaced apart on the second sidewall 22 of the valve disc 20, and specifically, the line connecting the first mounting seat 23 and the second mounting seat 24 is parallel to the axis of the rotating shaft 200.

[0043] A first movable channel 231 is defined within the first mounting seat 23. The first movable channel 231 extends in the same direction as the air outlet channel 11 of the housing 10. That is, the first movable channel 231 extends substantially perpendicular to the plane of the valve plate 20. A first movable member 40 is positioned within the first movable channel 231, capable of reciprocating along the direction of the first movable channel 231. The first movable member 40 is generally cylindrical, and the first movable channel 231 is also a matching cylindrical channel. The outer circumferential wall of the first movable member 40 is in sealing contact with the inner circumferential wall of the first movable channel 231. The first movable member 40 divides the first movable channel 231 into a first movable section 271 located below and a second movable section 272 located above. A first elastic member 81 is positioned within the first movable section 271, configured to abut against the lower end of the first movable member 40. A second elastic member 82 is positioned within the second movable section 272, configured to abut against the upper end of the first movable member 40. Specifically, both the first and second elastic members 81 and 82 are preferably springs. Under the action of the first spring, the first movable member 40 has a tendency to move along a first direction L1. Under the action of the second spring, the first movable member has a tendency to move along a second direction L2, where the first direction L1 and the second direction L2 are two different directions along the extension direction of the air outlet channel. The first movable member 40 also has a first pressure relief channel 41. The first pressure relief channel 41 is L-shaped, with a first port 411 formed at the end of the first movable member 40 and a second port 412 formed on the outer peripheral wall of the first movable member 40. The valve plate 20 also has a first upstream pressure-inducing channel 251 in communication with the first movable section 271 of the first movable channel 231. Correspondingly, a first pressure-inducing port 211 in communication with the first upstream pressure-inducing channel 251 is formed on the first side wall 21 of the valve plate 20. The first mounting seat 23 of the valve disc 20 also defines a first downstream pressure-inducing channel 252. Specifically, the port connecting the first downstream pressure-inducing channel 252 to the second movable section 272 of the first movable channel 231 is located on the inner circumferential wall of the first movable channel 231 of the first mounting seat 23. A third pressure-inducing port 221 communicating with the first downstream pressure-inducing channel 252 is also formed on the outer wall of the first mounting seat 23. When the first movable member 40 reciprocates up and down, the second port of the first pressure relief channel 41 can correspond to and communicate with the port of the first downstream pressure-inducing channel 252 (e.g., when moving upward to a set position), or it can be blocked by the inner wall of the first movable channel 231 (e.g., when moving downward to a set position).

[0044] The second mounting base 24 defines a second movable channel 241. This second movable channel 241 extends in the same direction as the air outlet channel 11 of the housing 10. That is, the second movable channel 241 extends substantially perpendicular to the plane of the valve plate 20. A second movable member 50 is positioned within the second movable channel 241, capable of reciprocating along the direction of the second movable channel 241. The second movable member 50 is generally cylindrical, and the second movable channel 241 is also a matching cylindrical channel. The outer circumferential wall of the second movable member 50 is in sealing contact with the inner circumferential wall of the second movable channel 241. The second movable member 50 also divides the second movable channel 241 into a first movable section 271 located above and a second movable section 272 located below. The first movable section 271 is provided with a first elastic member 81 for abutting the upper end of the second movable member 50. The second movable section 272 is provided with a second elastic member 82 for abutting the lower end of the second movable member 50. Specifically, both the first elastic member 81 and the second elastic member 82 are preferably springs. The second movable member 50 also defines a second L-shaped pressure relief channel 51, with a first port 511 formed at the end of the second movable member 50 and a second port 512 formed on the outer peripheral wall of the second movable member 50. The valve disc 20 also defines a second upstream pressure-inducing channel 261, which communicates with the first movable section 271 of the second movable channel 241. Correspondingly, a second pressure-inducing port 212, which communicates with the second upstream pressure-inducing channel 261, is formed on the first sidewall 21 of the valve disc 20. A second downstream pressure-inducing channel 262 is also defined on the second mounting seat 24 of the valve disc 20. Specifically, the port connecting the second downstream pressure-inducing channel 262 to the second movable section 272 of the second movable channel 241 is located on the inner peripheral wall of the second movable channel 241 of the second mounting seat 24. A fourth pressure-inducing port 222, which communicates with the second downstream pressure-inducing channel 262, is also formed at the junction of the outer wall of the second mounting seat 24 and the second sidewall 22 of the valve disc 20. When the second movable part 50 moves back and forth up and down, the second port of the second pressure relief channel 51 can correspond to and be connected with the port of the second downstream pressure-inducing channel 262 (such as when it moves downward to the set position), and can also be blocked by the inner wall of the second movable channel 241 (such as when it moves upward to the set position).

[0045] The first movable member 40 disposed in the first mounting seat 23 and the second movable member 50 disposed in the second mounting seat 24 are similar to pressure valve structures that can be opened and closed according to pressure changes upstream and downstream of the valve plate 20 .

[0046] The first mounting seat 23 also defines a first limiting slideway 232 extending from the outside to the inside into the first movable channel 231 and extending in the same direction as the first movable channel 231. Accordingly, the outer peripheral wall of the first movable member 40 defines a first pin 42 extending outwardly and slidably disposed within the first limiting slideway 232. Specifically, the end of the first pin 42 slightly protrudes from the outer wall of the first mounting seat 23. The second mounting seat 24 defines a second limiting slideway 242 extending from the outside to the inside into the second movable channel 241 and extending in the same direction as the second movable channel 241. Correspondingly, the outer peripheral wall of the second movable member 50 defines a second pin 52 extending outwardly and slidably disposed within the second limiting slideway 242. Specifically, the end of the second pin 52 slightly protrudes from the outer wall of the second mounting seat 24. The first pin 42 of the first movable member 40 and the second pin 52 of the second movable member 50 are connected via a connecting rod 60 hinged to the valve plate 20. Specifically, a hinge seat 28 is further provided on the second side wall 22 of the valve disc 20. The middle portion of a connecting rod 60 is pivotally connected to the hinge seat 28 via a pin. The first and second ends of the connecting rod 60 each have a first linear slideway 61 and a second linear slideway 62 extending along the length of the connecting rod 60. The first pin 42 of the first movable member 40 slides within the first linear slideway 61, while the second pin 52 of the second movable member 50 slides within the second linear slideway 62. The outer diameter of the first pin 42 matches the width of the first linear slideway 61, while the outer diameter of the second pin 52 matches the width of the second linear slideway 62.

[0047] In a natural state, that is, when there is no pressure difference between the upstream and downstream sides of the valve plate 20, the first movable member 40 is in a state of disconnecting the first pressure relief channel 41 under the combined action of the first spring and the second spring. When the range hood is in operation, as the air pressure upstream of the valve plate 20 increases, the first movable member 40 moves upward to a set position, connecting the first upstream pressure-inducing flow channel 251 with the first downstream pressure-inducing flow channel 252 through the first pressure relief channel 41. Figure 3 Similarly, in its natural state, i.e., when there is no pressure difference upstream and downstream of the valve disc 20, the second movable member 50, under the combined action of the first and second springs, also disconnects the second pressure relief passage 51. During operation of the range hood, as the air pressure upstream of the valve disc 20 increases, the second movable member 50 moves downward to its set position, connecting the second upstream pressure-inducing flow passage 261 with the second downstream pressure-inducing flow passage 262 via the second pressure relief passage 51.

[0048] During the actual operation of the range hood, due to the operating characteristics of the centrifugal fan 73 itself or the instability of the external environment (the pressure of the public flue), the pressure difference between the upstream and downstream of the valve plate 20 will fluctuate (that is, pressure disturbance will be generated). This will cause the movable parts of the vibration-assisted opening structure on the valve plate 20 (similar to spring oscillators) to perform simple harmonic motion. At the same time, the valve plate 20 itself will also vibrate accordingly. When the vibration frequencies of the two are the same (this can be achieved by selecting elastic parts of a suitable elastic system), the vibration intensity can be effectively enhanced, which can effectively overcome the resistance of oil and dirt adhesion, and thus play a better valve plate assisting opening function. The air outlet hood structure does not require additional energy input, and can be achieved by relying on the wind force of the range hood itself. It is cleverly designed and simple in structure, which improves the stability of the air outlet hood, ensures the non-return function of the air outlet hood valve plate 20, and improves the smoke exhaust capacity of the range hood.

[0049] When the pressure relief channel of the movable member is connected to the upstream pressure inlet channel and the downstream pressure inlet channel, the movable member performs simple harmonic motion along the extending direction of the movable channel according to the pressure difference between the upstream and downstream sides of the valve plate 20. The principle is as follows:

[0050] See also Figure 2 When the valve disc 20 is not blocked, the pressures upstream and downstream of the valve disc 20 are equal. At this time, there is no pressure disturbance upstream and downstream of the valve disc 20, and the first movable member 40 and the second movable member 50 remain stationary. When the valve disc 20 is blocked, after the fan system is started, a pressure differential is generated at the upstream and downstream ends of the valve disc 20, that is, a pressure differential is generated between the first movable section 271 and the second movable section 272 of the movable channel. Taking the first vibration-assisted opening structure 31 as an example, if the pressure of the second movable section 272 of the first movable channel 231 is p2, the pressure of the first movable section 271 is p1, the upper surface area of the first movable member 40 is s, the mass of the first movable member 40 is m, the first spring elastic coefficient is k1, and the second spring elastic coefficient is k2, when it is not blocked, the distance between the second port 412 of the first pressure relief channel 41 and the port of the first downstream pressure-inducing flow channel 252 is A1;

[0051] make

[0052] Movement state when valve plate is blocked (no pressure disturbance), see Figure 3 , s*(p1-p2)=k3*A1;

[0053] When the valve is blocked (with pressure disturbance), see Figure 4 , let the distance between the second port of the first pressure relief channel 41 and the port of the first downstream pressure-inducing channel 252 be x(t) (which can be a negative value), t be time, and the force difference generated by the disturbance on the upper and lower surfaces of the first movable member 40 be f(t), where f(t) is the random disturbance force, and the time-averaged magnitude of f(t) is F2;

[0054] Then mx+k3x=F(t);

[0055] The motion form of the first movable member 40 can be solved as follows:

[0056] in

[0057] make

[0058] It can be seen that the first movable part 40 is a simple harmonic motion with a fixed frequency fre1. The motion analysis of the second movable part 50 is similar. The fixed frequency can be recorded as fre2, and fre1=fre2. Because the first movable part 40 and the second movable part 50 are connected by a connecting rod 60, their initial motion directions are opposite. Therefore, the motions of the first movable part 40 and the second movable part 50 can reinforce each other.

[0059] Through simulation calculations of the valve disc 20, it can be concluded that it has an inherent mode with a fixed frequency fre3. In this embodiment, the first and second springs can be reasonably selected so that fre1 = fre2 = fre3. Therefore, when the valve disc 20 is blocked, the instability of the fan and the external environment causes pressure fluctuations, which in turn causes the first movable part 40 and the second movable part 50 to move under the action of the pressure difference fluctuation above and below the valve disc 20, driving the valve disc 20 to move together. Since the three have the same frequency, the vibration intensity reinforces each other, thereby achieving a better valve disc opening assist function. On the other hand, since the frequency generated by the vibration assist opening structure is relatively single, it can emit a specific sound to indicate the working status of the air outlet hood, making it easier to identify during fault diagnosis, helping maintenance personnel to quickly locate the problem and greatly improving maintenance efficiency.

[0060] See also Figure 6 and Figure 7 This embodiment also relates to a range hood, comprising a housing 70, an air hood, and a fan system. The housing 70 includes a fan frame 71 and a fume hood 72. The fume hood 72 is disposed at the bottom of the fan frame 71 and communicates with the interior of the fan frame 71. The fume hood 72 is provided with an air inlet 74. The fan system is a centrifugal fan 73 disposed within the fan frame 71 and configured to provide negative pressure for extracting and discharging oil fumes. The top of the fan frame 71 has an air outlet opposite the outlet of the centrifugal fan 73, to which the aforementioned air hood 1 is connected.

[0061] The "fluid communication" referred to in the present invention refers to the spatial position relationship between two components or parts (hereinafter collectively referred to as the first part and the second part), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. An air outlet cover for a range hood, comprising: The cover body (10) is hollow inside to form an air outlet channel (11) for air flow to pass through; a valve plate (20) rotatably disposed in the air outlet channel (11) of the cover body (10) and opening or closing the air outlet channel (11); It is characterized in that it also includes a vibration-assisted opening structure provided on the valve disc (20) for assisting the valve disc (20) in opening, and the vibration-assisted opening structure includes: A movable channel is provided on the valve plate (20), wherein a movable member capable of reciprocating along its extension direction is provided in the movable channel, wherein the movable member divides the movable channel into a first movable section (271) and a second movable section (272), wherein the extension direction of the movable channel is opposite to a first direction (L1) and a second direction (L2); An upstream pressure-inducing flow channel, used for obtaining the pressure of the air outlet channel (11) corresponding to the upstream of the valve plate (20), and communicating with the first movable section (271) of the movable channel; A downstream pressure-inducing flow channel is used to obtain the pressure of the air outlet channel (11) corresponding to the downstream of the valve plate (20), and is connected to the second movable section (272) of the movable channel; A first elastic member (81) acts on the movable member and causes the movable member to always have a tendency to move along a first direction (L1); A second elastic member (82) acts on the movable member and causes the movable member to always have a tendency to move along the second direction (L2); The movable part is provided with a pressure relief channel that can connect the upstream pressure-inducing flow channel and the downstream pressure-inducing flow channel. When the pressure relief channel of the movable part is connected to the upstream pressure-inducing flow channel and the downstream pressure-inducing flow channel, the movable part can move back and forth along the extension direction of the movable channel according to the pressure difference change between the upstream and downstream of the valve plate (20).

2. The air outlet cover for a range hood according to claim 1, characterized in that: The movable part is cylindrical as a whole, and the movable channel is a cylindrical hole adapted to the movable part. The pressure relief channel on the movable part has a first port for communicating with the upstream pressure-inducing flow channel and a second port for communicating with the downstream pressure-inducing flow channel. At least one of the first port and the second port of the pressure relief channel is opened on the outer peripheral wall of the movable part, so that the pressure relief channel can be connected and closed during the reciprocating movement of the movable part along the extension direction of the movable channel.

3. The air outlet cover for a range hood according to claim 2, characterized in that: The pressure relief channel on the movable part is L-shaped, that is, the first port of the pressure relief channel is opened at the end of the movable part, and the second port is opened on the outer peripheral wall of the movable part.

4. The air outlet cover for a range hood according to claim 1, characterized in that: The first elastic member (81) is a first spring provided in a first movable section (271) of the movable channel, and the second elastic member (82) is a second spring provided in a second movable section (272) of the movable channel. In a natural state, the movable member is in a state of disconnecting the pressure relief channel under the combined action of the first spring and the second spring.

5. The air outlet cover for a range hood according to any one of claims 1 to 4, characterized in that: The extending direction of the movable channel is consistent with the extending direction of the air outlet channel (11) of the cover body (10); the valve plate (20) is provided with two vibration-assisted opening structures arranged at intervals, and the two vibration-assisted opening structures are respectively recorded as a first vibration-assisted opening structure (31) and a second vibration-assisted opening structure (32); the movable channel, movable part and pressure relief channel of the first vibration-assisted opening structure (31) are respectively recorded as a first movable channel (231), a first movable part (40) and a first pressure relief channel (41); the movable channel, movable part and pressure relief channel of the second vibration-assisted opening structure (32) are respectively recorded as a second movable channel (241), a second movable part (50) and a second pressure relief channel (51); the first movable part (40) and the second movable part (50) are linked by a connecting rod (60), so that the first pressure relief channel (41) and the second pressure relief channel (51) can be opened or closed synchronously.

6. The air outlet cover for a range hood according to claim 5, characterized in that: The valve plate (20) has a first side wall (21) facing the airflow and a second side wall (22) away from the airflow. The second side wall (22) of the valve plate (20) has two first mounting seats (23) and second mounting seats (24) both protruding outward relative to the second side wall (22). The first mounting seat (23) defines the first movable channel (231), and the second mounting seat (24) defines the second movable channel (241). The first mounting seat (23) is provided with a first limiting slideway (232) extending from the outside to the inside to the first movable channel (231) and in the same direction as the extension of the first movable channel (231). The second mounting seat (24) is provided with a first limiting slideway (232) extending from the outside to the inside to the second movable channel (241) and in the same direction as the extension of the second movable channel (241). The connecting rod (60) is hinged at its middle part on the second side wall (22) of the valve plate (20); the first end of the connecting rod (60) has a first linear slideway (61) extending along the length direction of the connecting rod (60) and capable of being slidably provided in the first linear slideway (61); the second end of the connecting rod (60) has a second linear slideway (62) extending along the length direction of the connecting rod (60) and capable of being slidably provided in the second linear slideway (62); The connecting rod (60), the first vibration-assisted opening structure (31), and the second vibration-assisted opening structure (32) together constitute a vibration-assisted opening structure assembly.

7. The air outlet cover for a range hood according to claim 6, characterized in that: The extending direction of the connecting rod (60) is parallel to the direction of the rotation axis of the valve plate (20) rotating around the cover body (10).

8. The air outlet cover for a range hood according to claim 6, characterized in that: The first movable section (271) of the first movable channel (231) is located below the first movable channel (231), and the first movable section (271) of the second movable channel (241) is located above the second movable channel (241). A first pressure inlet (211) is provided on the first side wall (21) of the valve plate (20), and the first pressure inlet (211) is connected to the first movable section (271) of the first movable channel (231) through the upstream pressure inlet channel of the first vibration-assisted opening structure (31). A second pressure inlet (212) is also provided on the first side wall (21) of the valve plate (20), and the second pressure inlet (212) is connected to the first movable section (271) of the second movable channel (241) through the upstream pressure inlet channel of the second vibration-assisted opening structure (32).

9. The air outlet cover for a range hood according to claim 6, characterized in that: The valve discs (20) are provided with two symmetrically arranged ones, and each valve disc (20) is provided with the vibration-assisted opening structural component.

10. A range hood comprising a body (70), an air outlet hood, and a fan system disposed in the body (70), wherein the air outlet hood is in fluid communication with the fan system, and wherein: The air outlet hood is the air outlet hood for a range hood according to any one of claims 1 to 9.

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