Return air inlet with air volume adjusting function for green building system

Abstract

The utility model discloses a return air inlet with air volume regulation for a green building system, which comprises an air pipe with one side being a positive pressure side relative to the atmospheric pressure and the other side being a negative pressure side relative to the atmospheric pressure; the adjusting valve mechanism comprises a moving part and a fixed part which are sequentially arranged in the direction from the positive pressure side to the negative pressure side, the fixed part is of a panel structure and is fixedly connected with the inner wall of the air pipe through a connecting rod, the moving part is of a tubular structure with ventilation holes, and the end, close to the positive pressure side, of the moving part extends in the radial direction to form a sealing face; the sealing face is matched with and slidably connected with the inner wall of the air pipe, a sealing ring is arranged at the end, close to the negative pressure side, of the moving part, and the positive pressure side and the negative pressure side are blocked when the moving part is attached to the fixed part. And the actuating mechanism pulls the sealing surface through a pull rod to enable the moving part to be close to or far away from the fixed part. The air supply and exhaust volume can be adjusted according to the air supply and exhaust pressure difference, the pressure loss condition is avoided, and the long-term use of the tuyere is maintained.

Description

TECHNICAL FIELD

[0001] The utility model relates to a ventilation technical field more specifically, the utility model relates to a kind of back air inlet with air volume regulation for green building system. BACKGROUND

[0002] Centralized fresh air system or household fresh air system is used in green building system, and the indoor air pipe arrangement of the two systems is almost same, and fresh air pipe is introduced to each air-conditioning room by setting air distribution box in indoor, and fresh air is provided, and door head back air inlet is set in each air-conditioning room, and centralized back air inlet is set in living room or bathroom. Figure 1 As shown in the drawing, fresh air outlet is set in bedroom, and back air inlet is set in bedroom door head, and air is returned to living room, and air is discharged from exhaust port, so that the bedroom is slightly positive pressure during the use of back air inlet. Fixed air inlet is mostly used in traditional back air inlet, and sound-absorbing cotton is installed inside. After the fresh air volume of air outlet and the back air volume of back air inlet are adjusted during system debugging, the system operates with fixed air volume. However, when the entrance door or the outer window is opened, indoor pressure loss is easily caused, so that the risk of condensation is increased. More seriously, when the range hood is opened, the air in the sewer pipe is sucked into the indoor along with the rapid increase of indoor pressure difference, which affects the indoor air quality and increases the risk of illness of residents. SUMMARY

[0003] The utility model provides a kind of back air inlet with air volume regulation for green building system, which can adjust the air volume of air supply and exhaust according to the pressure difference of air supply and exhaust, avoid the occurrence of pressure loss, and maintain the long-term use of air inlet.

[0004] In order to achieve these purposes and other advantages according to the utility model, a back air inlet with air volume regulation for green building system is provided, comprising:

[0005] An air pipe, one side of which is a positive pressure side relative to atmospheric pressure, and the other side is a negative pressure side relative to atmospheric pressure;

[0006] An adjusting valve mechanism, which includes a moving part and a fixed part arranged in sequence from the positive pressure side to the negative pressure side, the fixed part is a panel structure, and is fixedly connected with the inner wall of the air pipe through a connecting rod, the moving part is a tubular structure with air vents, the end of the moving part close to the positive pressure side extends radially with a sealing surface, the sealing surface is matched with and slidably connected with the inner wall of the air pipe, and the end of the moving part close to the negative pressure side is provided with a sealing ring, and the moving part blocks the positive pressure side and the negative pressure side when it is attached to the fixed part.

[0007] An actuator, which pulls the sealing surface through a pull rod to make the moving part close to or away from the fixed part.

[0008] Preferably, the negative pressure side is provided with a rotating air shield panel.

[0009] Preferably, the inner wall of the air duct is provided with a guide rail, the sealing surface is provided with a sliding block, the sliding block is in sliding connection with the guide rail, and the edge of the sealing surface is in sliding sealing with the guide rail.

[0010] Preferably, the inner wall of the air duct is further provided with sound-absorbing cotton, and the sound-absorbing cotton is located between the fixed part and the negative pressure side.

[0011] Preferably, the actuator comprises:

[0012] a chamber mounted on the inner wall of the air duct and located between the fixed part and the sound-absorbing cotton, the inner wall of the chamber is provided with a limiting plate, the chamber is divided into a first chamber close to the positive pressure side and a second chamber close to the negative pressure side, the side wall of the first chamber is provided with a through groove in the axial direction for the sliding of the pull rod, and the end face of the second chamber is provided with a through hole at the center thereof;

[0013] an electromagnet assembly comprising a first-stage electromagnet, a second-stage electromagnet and a third-stage electromagnet which are sequentially stacked on the end face of the second chamber from the positive pressure side to the negative pressure side, and the inner diameters of the first-stage electromagnet, the second-stage electromagnet and the third-stage electromagnet are sequentially reduced;

[0014] a magnetic attraction assembly comprising a three-step shaft, a first-stage magnetic attraction sheet, a second-stage magnetic attraction sheet, a third-stage magnetic attraction sheet and a spring, the three-step shaft is provided with a spring baffle at one end close to the positive pressure side and penetrates through the electromagnet assembly and the through hole at the other end close to the negative pressure side, the outer diameters of the three-step shaft from one end to the other end are sequentially increased, including a first shaft segment, a second shaft segment and a third shaft segment, the first-stage magnetic attraction sheet is fixed on the first shaft segment, the length of the first shaft segment close to the second shaft segment is a first stroke, the length of the second shaft segment is a second stroke, the inner diameter of the second-stage magnetic attraction sheet is arranged to be movable within the first stroke, the inner diameter of the third-stage magnetic attraction sheet is arranged to be movable within the first stroke and the second stroke, the first stroke is greater than the thickness of the first-stage electromagnet, the second stroke is greater than the thickness of the second-stage electromagnet, the outer diameter of the first-stage magnetic attraction sheet, the inner diameter of the first-stage electromagnet, the outer diameter of the second-stage magnetic attraction sheet, the inner diameter of the second-stage electromagnet, the outer diameter of the third-stage magnetic attraction sheet and the inner diameter of the third-stage electromagnet are sequentially reduced, the spring is sleeved on the first shaft segment and located between the spring baffle and the limiting plate, and the spring baffle is connected with the pull rod;

[0015] a power generation assembly comprising a flow guide pipe and a power generator, the flow guide pipe is fixedly arranged in the axial direction of the air duct, the initial end air inlet of the flow guide pipe is close to the positive pressure side, the flow guide pipe sequentially penetrates through the moving part and the fixed part, and the terminal air inlet of the flow guide pipe is fixedly connected with the power generator, and the power generator generates electricity to energize the electromagnet assembly.

[0016] Preferably, the beginning end of the draft tube is expanded to form an expanded diameter air port, and the end of the draft tube is reduced to form a reduced diameter air port.

[0017] The utility model at least has following beneficial effects:

[0018] Firstly, the utility model adjusts the valve mechanism and the actuator inside the air pipe to open and close the return air port, adjusts the air volume according to the pressure difference of the air supply and exhaust, avoids the pressure loss, maintains the long-term use of the air port, and the return air port can be installed on the door head of the bedroom as the door head return air port, can also be installed in the living room or bathroom as the centralized return air port, adjusts the installation direction of the positive pressure side and the negative pressure side according to the different functions of the installed room, and prevents the return air port from backflowing due to the high indoor negative pressure.

[0019] Secondly, the two ends of the air pipe are communicated with the indoor and outdoor, the pressure difference between the indoor and outdoor is positive, that is, the indoor of the bedroom forms a micro-positive pressure, when the entrance door is opened and the range hood is operated, the pressure difference between the two ends of the indoor and outdoor increases rapidly, that is, the indoor of the bedroom forms an over-positive pressure relative to the micro-positive pressure state, the positive pressure side and the negative pressure side of the air pipe can be provided with umbrella-shaped or disc-shaped air ports, which are not limited to circular, square or other shapes, the moving part includes a pipe body, the pipe body is provided with a radial sealing surface to form a disc-shaped center opening, that is, when the moving part moves, the sealing surface slides and seals with the inner wall of the air pipe, the center of the pipe body is provided with a ventilation hole, air can flow out through the ventilation hole, and the edge of the ventilation port is provided with a sealing ring which can be provided in the form of protruding outward.

[0020] Thirdly, the air cover panel is provided to adjust the system air volume during the debugging initial stage, the air volume is adjusted by rotating the air cover panel to change the ventilation area. The guide rail can be formed on the inner wall surface of the air pipe or embedded in the inner wall of the air pipe (when the wall thickness is large), the sealing gasket can be arranged at the edge of the position where the sealing surface contacts the guide rail to realize the sliding of the sliding block and the sliding sealing. The sound-absorbing cotton is arranged to absorb noise and reduce the reflection and propagation of sound.

[0021] Fourth, by setting the actuator, the valve can be automatically opened and closed according to the pressure difference, the chamber can be cylindrical cavity or cubic cavity, the limit plate and the first, second and third electromagnets can be ring or mouth-shaped structure, the first and second chambers are communicated, the spring is arranged in the first chamber, and the spring is a tension spring. When the micro-positive pressure is normal, the elastic force of the spring can overcome the electromagnetic force of each stage of the magnetic sheet and each stage of the electromagnet, so that the first stage of the magnetic sheet is attached to the limit plate. At this time, the three-step shaft moves to one end of the stroke range, the displacement of the pull rod relative to the limit plate is maximum, the pull rod drives the moving part and the fixed part to form a certain distance, the valve is opened, and the micro-positive pressure is converted into super-positive pressure. When the spring elastic force is less than the electromagnetic force of each stage of the magnetic sheet and each stage of the electromagnet, the spring is stretched, the first stage of the magnetic sheet is away from the limit plate and moves towards the electromagnet assembly square. At this time, the three-step shaft gradually moves to the other end of the stroke range, the displacement of the pull rod relative to the limit plate is minimum, the pull rod drives the moving part to attach to the fixed part, and the valve is closed.

[0022] Fifth, if only one electromagnet and one magnetic sheet are arranged, there may be a problem that the electromagnetic force cannot act on the magnetic sheet or the suction force of the magnetic sheet is too small due to the too far distance. Therefore, three electromagnets and three magnetic sheets are arranged, and the inner diameter and length of each stage of the electromagnet and the inner diameter, outer diameter and length of each stage of the magnetic sheet are matched. Since the total stroke is relatively large during the opening and closing process of the valve assembly, the first stage of the magnetic sheet is fixedly arranged on the three-step shaft and drives the three-step shaft to move together, the second and third stages of the magnetic sheet are movably arranged, the second stage of the magnetic sheet is movable in the first stroke and the stroke is hindered in the second shaft section, and the third stage of the magnetic sheet is movable in the first and second strokes and the stroke is hindered in the third shaft section. During the continuous power generation process of the generator, when the electromagnetic force increases, the third stage of the magnetic sheet is attracted to move towards the electromagnet, pushes the three-step shaft to move, and the third stage of the magnetic sheet is directly adsorbed on the third electromagnet after passing through the inner circle of the first and second electromagnets. At this time, the second stage of the magnetic sheet is attracted to move towards the end of the second stroke and abuts against the third shaft section. When the electromagnetic force continues to increase, the second stage of the magnetic sheet is attracted to move towards the electromagnet, pushes the three-step shaft to continue to move, and the second stage of the magnetic sheet is directly adsorbed on the second electromagnet after passing through the inner circle of the first electromagnet. At this time, the distance between the first stage of the magnetic sheet and the electromagnet assembly is pulled in, and the continuous action of the electromagnetic force causes the first stage of the magnetic sheet to be attracted to move towards the electromagnet, further pushes the three-step shaft to continue to move, and the first stage of the magnetic sheet is directly adsorbed on the first electromagnet. Through the stepped adsorption mode, the problem that the electromagnetic force cannot act on the magnetic sheet due to small electromagnetic force or too far distance is avoided, and the control of the valve is realized.

[0023] Sixth, the flow guide pipe is arranged through the positive pressure side and the negative pressure side, due to the existence of pressure difference, the wind direction of the flow guide pipe continuously flows along the positive pressure side to the negative pressure side direction, the generator is a micro generator, the generator is arranged at the end air outlet, the airflow of the through air passage and the airflow of the flow guide pipe can act on the generator, so that the electromagnet is electrified, when the micro positive pressure is usually, the pressure difference is small, the wind speed is small, the generator blade rotates at a small speed, the generator voltage is low, the electromagnet magnetism is small, the spring elastic force is greater than the electromagnetic force of each stage electromagnet, the three-step shaft moves to the positive pressure side under the action of the spring, the moving part moves to the positive pressure side, the valve is opened, and the air is freely circulated; When the micro positive pressure is converted into the super positive pressure, the pressure difference is large, in the first stage, the airflow of the through air passage and the airflow of the flow guide pipe act on the generator, the rotating speed of the generator blade is increased, the generator voltage is increased, the electromagnet magnetism is large, the spring elastic force is less than the electromagnetic force of each stage electromagnet, the three-step shaft moves to the negative pressure side under the action of the spring, the moving part moves to the negative pressure side, the moving part gradually approaches the fixed part, and the valve is gradually closed; in the second stage, the air flow of the through air passage is suddenly reduced, the airflow of the flow guide pipe is suddenly increased, the rotating speed of the generator blade is further increased, the generator voltage is further increased, the electromagnet magnetism is further increased, the first stage magnetic absorption sheet is directly adsorbed on the first stage electromagnet, the three-step shaft moves to the negative pressure side under the action of the spring, the moving part is quickly attached to the fixed part, and the valve is accelerated to close.

[0024] Other advantages, objects and features of the present application will be apparent from the following description, and will be understood by those skilled in the art upon reading and understanding the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is an installation schematic view of the return air outlet of the present application;

[0026] Figure 2 It is a structure schematic view of the valve opening of a technical scheme of the present application;

[0027] Figure 3 It is a structure schematic view of the valve opening of a technical scheme of the present application;

[0028] Figure 4 It is a structure schematic view of a technical scheme of the present application;

[0029] Figure 5 It is an actuator structure schematic view of a technical scheme of the present application;

[0030] Figure 6 It is a three-step shaft structure schematic view of a technical scheme of the present application;

[0031] Figure 7 The structure diagram of the power generation assembly of one of the technical schemes of the utility model. DETAILED DESCRIPTION

[0032] The utility model will be further explained in detail below with reference to the drawings, so that the person skilled in the art can implement according to the description.

[0033] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0034] It should be noted that the experimental methods in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial channels unless otherwise specified; in the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "set" should be understood broadly, for example, it can be fixedly connected, set, or detachably connected, set, or integrally connected, set. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. The orientation or position relationship indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0035] As shown in Figure 1 The two ends of the air pipe are communicated with the bedroom and the living room respectively, the fresh air is sent into the bedroom by the air inlet, and the air is returned by the air return, so that the air pipe of the air return on one side of the bedroom is positive pressure relative to the atmospheric pressure, that is, the positive pressure side, and the air pipe of the air return on one side of the living room is negative pressure relative to the atmospheric pressure, that is, the negative pressure side, the pressure difference of the two ends of the air pipe is positive, that is, the micro-positive pressure is formed in the bedroom, when the entrance door is opened and the range hood is operated, the pressure of the negative pressure side decreases rapidly, the pressure difference of the two ends of the air pipe is still positive and increases rapidly, that is, the super-positive pressure is formed in the bedroom, the utility model solves the problem that when the micro-positive pressure is formed in the bedroom, the valve of the air pipe is opened to form a path, when the super-positive pressure is formed in the bedroom, the valve of the air pipe is closed to form a circuit, avoiding pressure loss and preventing backflow.

[0036] As shown in Figures 2-4 The utility model provides a kind of air volume regulation's air return for green building system, comprising:

[0037] The air duct 1 has one side relative to atmospheric pressure as a positive pressure side and the other side relative to atmospheric pressure as a negative pressure side, and the two ends of the air duct 1 are respectively communicated with the indoor and outdoor, and the pressure difference between the indoor and outdoor is positive, that is, a micro-positive pressure is formed in the bedroom, when the entrance door is opened and the range hood is operated, the pressure difference between the two ends of the indoor and outdoor is rapidly increased, that is, a super-positive pressure relative to the micro-positive pressure state is formed in the bedroom, and the positive pressure side and the negative pressure side of the air duct 1 can be provided with umbrella-shaped or disc-shaped air outlets, and are not limited to circular, square or other shapes.

[0038] The adjusting valve mechanism comprises a moving part 2 and a fixed part 3 arranged in sequence from the positive pressure side to the negative pressure side, the fixed part 3 is a panel structure, and is fixedly connected with the inner wall of the air duct 1 through a connecting rod, the fixed part 3 comprises a valve plate, and the periphery is ventilated, the moving part 2 is a tubular structure with a ventilation hole, the end of the moving part 2 close to the positive pressure side extends radially and has a sealing surface, forming a disc with a central opening, and the center of the pipe body is provided with a ventilation hole, so that air can flow out through the ventilation hole, that is, when the moving part 2 moves, the sealing surface is matched with and slidably connected with the inner wall of the air duct 1, and the end of the moving part 2 close to the negative pressure side is provided with a sealing ring, the outer diameter of the sealing ring is smaller than that of the valve plate, and when the moving part 2 is attached to the fixed part 3, the positive pressure side and the negative pressure side are blocked, specifically, when the moving part 2 and the fixed part 3 form a certain spacing, the valve is opened, due to the micro-positive pressure in the room, air flows from the positive pressure side into the ventilation hole and flows to the negative pressure side through the gap between the outer periphery of the valve plate and the air duct 1, and the air path is open, when the moving part 2 moves to the valve plate of the fixed part 3 attached to the sealing ring, the valve is closed, and the air path is closed.

[0039] The actuator 20 pulls the sealing surface through the pull rod 8 to make the moving part 2 close to or away from the fixed part 3, and the movement of the moving part 2 can be realized in a manual or automatic manner, that is, the pull rod 8 is pulled manually or mechanically or electrically to drive the moving part 2 to move.

[0040] In the above technical solution, by arranging the adjusting valve mechanism and the actuator 20 in the air duct 1, the opening and closing of the return air outlet are realized, the air supply and exhaust air volume can be adjusted according to the pressure difference between the air supply and exhaust, the loss of pressure is avoided, the long-term use of the air outlet is maintained, the return air outlet can be installed on the door head of the bedroom as a door head return air outlet, and can also be installed in the living room or bathroom as a centralized return air outlet, according to the different functions of the installed room, the installation directions of the positive pressure side and the negative pressure side are adjusted, and the problem of backflow of the return air outlet caused by the high indoor negative pressure is prevented.

[0041] In another technical solution, the negative pressure side is provided with a rotating air cover panel. The air cover panel is arranged for adjusting the air volume of the system during debugging, and the air volume is adjusted by rotating the air cover panel to change the ventilation area.

[0042] In another technical solution, the inner wall of the air duct 1 is provided with a guide rail 4, the sealing surface is provided with a sliding block, the sliding block is in sliding connection with the guide rail 4, and the edge of the sealing surface is in sliding sealing with the guide rail 4. The guide rail 4 can be formed on the inner wall surface of the air duct 1 or embedded in the inner wall of the air duct 1 (when the wall thickness is large), and a sealing gasket can be arranged at the edge of the sealing surface in contact with the guide rail 4 to realize the sliding of the sliding block and the sliding sealing.

[0043] In another technical solution, the inner wall of the air duct 1 is further embedded with sound-absorbing cotton 5, and the sound-absorbing cotton 5 is located between the fixed part 3 and the negative pressure side. The sound-absorbing cotton 5 can absorb noise and reduce the reflection and propagation of sound.

[0044] As shown in Figures 5-7 Another technical solution is that the actuator 20 comprises:

[0045] A chamber 6 is mounted on the inner wall of the air duct 1 and located between the fixed part 3 and the sound-absorbing cotton 5. The inner wall of the chamber 6 is provided with a limiting plate 7, which divides the chamber 6 into a first chamber 6 close to the positive pressure side and a second chamber 6 close to the negative pressure side. The side wall of the first chamber 6 is provided with a through groove in the axial direction for the sliding of the pull rod 8, and the end face of the second chamber 6 is provided with a through hole at the center;

[0046] An electromagnet assembly comprises a first-stage electromagnet 9, a second-stage electromagnet 10 and a third-stage electromagnet 11, which are sequentially stacked on the end face of the second chamber 6 from the positive pressure side to the negative pressure side. The inner diameter of the first-stage electromagnet 9, the second-stage electromagnet 10 and the third-stage electromagnet 11 gradually decreases;

[0047] The magnetic attraction assembly comprises a three-step shaft 12, a first magnetic attraction sheet 13, a second magnetic attraction sheet 14, a third magnetic attraction sheet 15, and a spring 16. The three-step shaft 12 is provided with a spring baffle 17 near one end of the positive pressure side, and passes through the electromagnetic assembly and the through hole near the other end of the negative pressure side. The outer diameter of the three-step shaft 12 increases from one end to the other end, including a first shaft section, a second shaft section, and a third shaft section. The first magnetic attraction sheet 13 is fixed on the first shaft section, and the length of the first shaft section near the second shaft section is a first stroke d1. The length of the second shaft section is a second stroke d2. The inner diameter of the second magnetic attraction sheet 14 is set to be movable within the first stroke d1. The inner diameter of the third magnetic attraction sheet 15 is set to be movable within the first stroke d1 and the second stroke d2. The first stroke d1 is greater than the thickness of the first electromagnet 9, and the second stroke d2 is greater than the thickness of the second electromagnet 10. The outer diameter of the first magnetic attraction sheet 13, the inner diameter of the first electromagnet 9, the outer diameter of the second magnetic attraction sheet 14, the inner diameter of the second electromagnet 10, the outer diameter of the third magnetic attraction sheet 15, and the inner diameter of the third electromagnet 11 decrease in turn. The spring 16 is sleeved on the first shaft section and located between the spring baffle 17 and the limiting plate 7. The spring baffle 17 is connected with the pull rod 8.

[0048] The power generation assembly comprises a flow guide pipe 18 and a generator 19. The flow guide pipe 18 is fixedly arranged along the axis of the wind pipe 1. The initial end of the flow guide pipe 18 is provided with a wind port near the positive pressure side. The flow guide pipe 18 passes through the moving part 2 and the fixed part 3 in turn. The terminal end of the flow guide pipe 18 is fixedly connected with the generator 19. The generator 19 generates electricity to energize the electromagnetic assembly.

[0049] In the above technical solution, the execution mechanism 20 is provided, so that the valve can be automatically opened and closed according to the pressure difference. The chamber 6 can be a cylindrical cavity or a cubic cavity. The limiting plate 7 and the first, second and third electromagnets 9, 10 and 11 can be annular or H-shaped structures. The first and second chambers 6 are communicated, and the spring 16 is arranged in the first chamber 6. The spring 16 is a tensile spring 16. When the pressure is usually slightly positive, the elastic force of the spring 16 can overcome the electromagnetic force of the magnetic absorbing sheet and the electromagnet, so that the first magnetic absorbing sheet 13 is attached to the limiting plate 7. At this time, the three-step shaft 12 moves to one end of the stroke range, and the displacement of the pull rod 8 relative to the limiting plate 7 is maximum. At this time, the pull rod 8 drives the moving part 2 and the fixed part 3 to form a certain distance, and the valve is opened. When the pressure is converted to super positive pressure, the elastic force of the spring 16 is smaller than the electromagnetic force of the magnetic absorbing sheet and the electromagnet, the spring 16 is stretched, the first magnetic absorbing sheet 13 moves away from the limiting plate 7 and moves towards the square electromagnet assembly. At this time, the three-step shaft 12 gradually moves to the other end of the stroke range, and the displacement of the pull rod 8 relative to the limiting plate 7 is minimum. At this time, the pull rod 8 drives the moving part 2 to attach to the fixed part 3, and the valve is closed.

[0050] If only one electromagnet 9 and one magnetic iron sheet 13 are set, there may be a problem that the magnetic attraction force cannot reach the magnetic iron sheet or the magnetic attraction force is too small. Therefore, three electromagnets 11 and three magnetic iron sheets 15 are arranged. The inner diameter and length of each electromagnet and the inner diameter, outer diameter and length of each magnetic iron sheet are matched. Since the total stroke is relatively large during the opening and closing process of the valve assembly, the first magnetic iron sheet 13 is fixedly arranged on the three-step shaft 12 and drives the three-step shaft 12 to move. The second magnetic iron sheet 14 and the third magnetic iron sheet 15 are movably arranged. The second magnetic iron sheet 14 moves in the first stroke d1 and is blocked in the second shaft section. The third magnetic iron sheet 15 moves in the first stroke d1 and the second stroke d2 and is blocked in the third shaft section. During the continuous power generation process of the generator 19, when the magnetic attraction force increases, the third magnetic iron sheet 15 is attracted to move towards the electromagnet, pushing the three-step shaft 12 to move. The third magnetic iron sheet 15 is directly adsorbed on the third electromagnet 11 after passing through the inner circle of the first electromagnet 9 and the second electromagnet 10. At this time, the second magnetic iron sheet 14 is attracted to the end of the second stroke d2 and abuts against the third shaft section. The magnetic attraction force continues to increase, the second magnetic iron sheet 14 is attracted to move towards the electromagnet, pushing the three-step shaft 12 to continue to move. The second magnetic iron sheet 14 is directly adsorbed on the second electromagnet 10 after passing through the inner circle of the first electromagnet 9. At this time, the distance between the first magnetic iron sheet 13 and the electromagnet assembly is pulled in. The continuous action of the magnetic attraction force makes the first magnetic iron sheet 13 be attracted to move towards the electromagnet, further pushing the three-step shaft 12 to continue to move. The first magnetic iron sheet 13 is directly adsorbed on the first electromagnet 9. Through the stepped adsorption mode, the problem that the magnetic attraction force cannot reach the magnetic iron sheet due to small magnetic attraction force or too far distance is avoided, and the control of the valve is realized.

[0051] The flow guide pipe 18 is arranged through the positive pressure side and the negative pressure side. Due to the pressure difference, the air flow direction of the flow guide pipe 18 continuously flows from the positive pressure side to the negative pressure side. The generator 19 is a micro generator 19. The generator 19 is arranged at the end air outlet. The air flow through the air passage and the air flow of the flow guide pipe 18 can act on the generator 19, so that the electromagnet is electrified. When the pressure is slightly positive, the pressure difference is small, the wind speed is small, the generator 19 blade rotates at a small speed, the generated voltage is low, the electromagnet magnetism is small, the elastic force of the spring 16 is greater than the electromagnetic force of each stage electromagnet, the three-step ladder shaft 12 moves to the positive pressure side under the action of the spring 16, the moving part 2 moves to the positive pressure side, the valve is opened, and the air flows freely. When the pressure is converted into super positive pressure, the pressure difference is large. In the first stage, the air flow through the air passage and the air flow of the flow guide pipe 18 act on the generator 19. The generator 19 blade speed increases, the generated voltage increases, the electromagnet magnetism is large, the elastic force of the spring 16 is less than the electromagnetic force of each stage electromagnet, the three-step ladder shaft 12 moves to the negative pressure side under the action of the spring 16, the moving part 2 moves to the negative pressure side, the moving part 2 gradually approaches the fixed part 3, the valve is gradually closed, the air flow through the air passage suddenly decreases, the air flow of the flow guide pipe 18 suddenly increases, the generator 19 blade speed further increases, the generated voltage further increases, the electromagnet magnetism further increases, the first stage magnetic absorption sheet 13 is directly absorbed on the first stage electromagnet 9, the three-step ladder shaft 12 moves to the negative pressure side under the action of the spring 16, the moving part 2 quickly adheres to the fixed part 3, and the valve is accelerated to close.

[0052] In another technical solution, the size of the initial end air outlet of the flow guide pipe 18 is expanded to form a diameter-expanded air outlet, and the size of the end air outlet of the flow guide pipe 18 is reduced to form a diameter-reduced air outlet. By further arranging the initial end air outlet and the end air outlet of the flow guide pipe 18 to pass through the diameter expansion and reduction, the wind speed passing through the flow guide pipe 18 is further increased, and directly acts on the generator 19.

[0053] The number of devices and the scale of processing described herein are used to simplify the description of the present application. The application, modification and change of the present application are obvious to those skilled in the art.

[0054] Although the embodiments of the present application have been disclosed as above, they are not limited to the application and implementation listed in the specification. It can be fully applied to various fields suitable for the present application, and other modifications can be easily realized by those skilled in the art. Therefore, the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. The return air vent with air volume adjustment for the green building system is characterized by: include: The air duct has one side with positive pressure relative to atmospheric pressure and the other side with negative pressure relative to atmospheric pressure; A regulating valve mechanism comprising a moving portion and a fixed portion arranged in sequence from the positive pressure side to the negative pressure side, wherein the fixed portion is a panel structure fixedly connected to the inner wall of the air duct via a connecting rod, and the moving portion is a tubular structure with ventilation holes, wherein the end of the moving portion close to the positive pressure side has a sealing surface extending radially, the sealing surface matches and is slidably connected to the inner wall of the air duct, and the end of the moving portion close to the negative pressure side is provided with a sealing ring, and when the moving portion is in contact with the fixed portion, the positive pressure side and the negative pressure side are blocked; The actuator pulls the sealing surface through a pull rod to make the moving part approach or move away from the fixed part.

2. The air return vent with air volume adjustment for a green building system according to claim 1, characterized in that: The negative pressure side is provided with a rotating wind shield panel.

3. The air return vent with air volume adjustment for a green building system according to claim 1, characterized in that: The inner wall of the air duct is provided with a guide rail, the sealing surface is provided with a slider, the slider is slidably connected to the guide rail, and the edge of the sealing surface is slidably sealed with the guide rail.

4. The air return vent with air volume regulation for a green building system according to claim 1, characterized in that: The inner wall of the air duct is also connected with sound-absorbing cotton, and the sound-absorbing cotton is located between the fixing part and the negative pressure side.

5. The air return vent with air volume regulation for a green building system according to claim 4, characterized in that: The executive mechanism comprises: A chamber is mounted on the inner wall of the air duct and is located between the fixing portion and the silencer cotton. A circle of limiting plates is provided on the inner wall of the chamber to separate the chamber into a first chamber close to the positive pressure side and a second chamber close to the negative pressure side. A through groove is provided in the axial direction of the side wall of the first chamber for the sliding of the pull rod, and a through hole is provided at the center of the end surface of the second chamber; an electromagnet assembly, comprising a primary electromagnet, a secondary electromagnet, and a tertiary electromagnet stacked sequentially on the end surface of the second chamber from the positive pressure side to the negative pressure side, wherein the inner ring sizes of the primary electromagnet, the secondary electromagnet, and the tertiary electromagnet decrease sequentially; The magnetic attraction component includes a three-step shaft, a primary magnetic iron sheet, a secondary magnetic iron sheet, a third magnetic iron sheet and a spring. The three-step shaft is provided with a spring baffle at one end close to the positive pressure side, and the other end close to the negative pressure side passes through the electromagnet assembly and the through hole. The outer diameter of the three-step shaft increases from one end to the other end, including a first shaft segment, a second shaft segment, and a third shaft segment. The primary magnetic iron sheet is fixed to the first shaft segment so that the shaft segment length of the first shaft segment adjacent to the second shaft segment is the first stroke, and the shaft segment length of the second shaft segment is the second stroke. The inner ring size of the secondary magnetic iron sheet is set to The first stroke is movable, and the inner ring size of the three-stage magnetic iron sheet is set to be movable in the first stroke and the second stroke. The first stroke is greater than the thickness of the first-stage electromagnet, and the second stroke is greater than the thickness of the second-stage electromagnet. The outer ring size of the first-stage magnetic iron sheet, the inner ring size of the first-stage electromagnet, the outer ring size of the second-stage magnetic iron sheet, the inner ring size of the second-stage electromagnet, the outer ring size of the third-stage magnetic iron sheet, and the inner ring size of the third-stage electromagnet decrease in sequence. The spring is sleeved on the first shaft segment and is located between the spring baffle and the limit plate. The spring baffle is connected to the pull rod; The power generation component includes a guide tube and a generator. The guide tube is fixedly arranged along the axial direction of the air duct. The starting air outlet of the guide tube is close to the positive pressure side. The guide tube passes through the moving part and the fixed part in sequence. The end air outlet of the guide tube is fixedly connected to the generator. The generator generates electricity to energize the electromagnet assembly.

6. The air return vent with air volume regulation for a green building system according to claim 5, characterized in that: The size of the air outlet at the beginning of the guide tube is enlarged to form an expanded diameter air outlet, and the size of the air outlet at the end of the guide tube is reduced to form a reduced diameter air outlet.

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