A room fresh air system with electric air door and a whole-house fresh air system

Abstract

The present invention provides a room fresh air system with an electric damper, the room is provided with a door, the door includes a door leaf; the room fresh air system includes a room fresh air outlet, a room fan coil unit and a room return air duct, the room fresh air outlet is opened on the door leaf, and the electric damper is arranged in the door leaf; the electric damper includes an electric drive device and a damper slide, the electric drive device extends a push rod, the damper slide is connected to the push rod, and the electric drive device drives the damper slide to open or close the room fresh air outlet through the push rod; the return air outlet of the room return air duct is connected to the room, and the exhaust air outlet of the room return air duct is connected to the outside atmosphere; the room fan coil unit is provided with an air outlet and an air intake port, the distance between the room fresh air outlet and the air intake port of the room fan coil unit is smaller than the distance between the room fresh air outlet and the return air outlet of the room return air duct.

Description

Technical Field

[0001] The present invention belongs to the technical field of fresh air systems, and in particular relates to a room fresh air system with an electric air door and a whole-house fresh air system. Background Art

[0002] We spend most of our lives living in residential buildings, essentially living in an indoor secondary air environment enclosed by residential walls and floors. The carbon dioxide and excrement produced by human metabolism, the fumes and water vapor emitted from cooking and bathing, the benzene and formaldehyde emitted by interior decoration materials, etc., cause indoor air pollution.

[0003] Bringing fresh air from outside the house into the house and simultaneously exhausting the polluted air inside the house to achieve "two-way flow" fresh air replacement in the house is the true meaning of home life.

[0004] To solve the ventilation problem of multiple enclosed spaces within a residential unit, such as the living room, bedroom, study, and bathroom, which are separated by inner and outer walls, doors and windows, there is only a "two-way flow" air supply and exhaust system; "Two-way flow" is the basic principle of ventilation in closed spaces, that is, air supply ducts are set to deliver fresh air to each enclosed space, and at the same time, another set of exhaust ducts are set to extract the dirty air from each enclosed space; the supply of fresh air and the discharge of dirty air are "two-way flow", which are two aspects of the same problem of "ventilation" of a building, and they are interdependent and indispensable; there is no practical "one-way flow" fresh air replacement.

[0005] The difficulty of residential ventilation lies in room ventilation. Because, even if the whole house air intake module and exhaust module are set up, and the conditions are met to deliver fresh air to the fresh air outlets at the door of each room through the living room corridor and to extract the dirty air in each room to the outdoors through the room return air duct, if the room fresh air outlet does not have relay air supply power, but only relies on the positive air supply pressure of the living room corridor and the negative air exhaust pressure of the room return air duct to achieve high-efficiency room fresh air replacement, it is still impossible: First, the fresh air delivered from the living room corridor to the door of each room can only be a "micro positive pressure" of 1pa instead of a "positive pressure" of 101pa or 102pa. Under this "micro positive pressure" drive, the fresh air in the living room corridor cannot generate more than 2m / s when passing through the room fresh air outlet. The speed and corresponding dynamic pressure head are difficult to produce a large-scale "stirring" of the air flow field inside the room; secondly, the room negative pressure generated by the exhaust module and the room return air duct is not enough to pull the fresh air at the room's fresh air outlet to produce a speed of more than 2m / s and the corresponding dynamic pressure head. In particular, when the return air outlet of the room return air duct is set close to the room fresh air outlet and on the same side, there will be a serious fresh air short circuit, that is, the fresh air flow entering the room's fresh air outlet does not obtain a higher dynamic pressure head to make it flow into the main space of the room, but goes straight to the room return air outlet along the path with the shortest distance and the least resistance between the room's fresh air outlet and the return air outlet of the return air duct, wasting fresh air resources and reducing the room's fresh air replacement effect.

[0006] In 2021, Shanghai Bohan Thermal Energy Technology Co., Ltd. proposed the "ductless supply and exhaust combined with exhaust-mainly whole-house two-way flow fresh air system based on room fan coil unit relay power". The air supply function of the living room corridor is used to replace the traditional air supply duct, and the secondary negative pressure of the fan coil units at the door of each room is used as the room fresh air replacement relay power to fully integrate the residential fresh air system and the air-conditioning system. It is a landmark event in the development of residential fresh air systems.

[0007] In the whole-house two-way fresh air system with no supply ducts and exhaust combined with exhaust as the main function based on the room fan coil relay power of Shanghai Bohan Thermal Energy Technology Co., Ltd., room fresh air replacement is the intermediate link and key link of the whole-house fresh air replacement, which is composed of the room door fresh air outlet, room fan coil and room return air duct in series; developing the secondary negative pressure function of the room door fan coil is the key to the whole-house two-way fresh air system.

[0008] When the room fresh air replacement is in operation, based on the primary negative pressure generated by the exhaust system and the room dirty air return duct, the door head fan coil unit generates secondary negative pressure at the air intake port when it is in operation, so that the air pressure at the door head in the room is the lowest in the room, and the maximum pressure difference is formed between the door head fresh air outlet and the corridor fresh air area, pulling the corridor fresh air into the room quickly through the door head fresh air outlet, and is sucked in by the fan coil unit with boosted pressure and shot toward the outer wall, reflected by the outer wall and then returned to the side of the inner wall where the door is located, driving the room dirty air into the room return duct, fundamentally solving the problem of fresh air short circuit in room fresh air replacement, with technical endowments of "secondary negative pressure", "deep suction and high discharge", and "room replacement and clearing", such as Figure 1 shown.

[0009] In the above-mentioned whole-house two-way fresh air system with no supply ducts and exhaust combined with exhaust as the main method based on room fan coil relay power, although there is a secondary negative pressure vortex at the air intake of the fan coil in the ceiling of each room, this secondary negative pressure vortex can become the power for fresh air from the living room corridor to flow into the room, but it still faces the problem of how the fresh air delivered to the living room corridor can pass through the door.

[0010] In a house, the door is the connecting node between the room and the corridor, and is open from front to back and without any obstacles.

[0011] How to take advantage of the special location of the door and develop the characteristics of the door being "open front and back, without obstacles", so that the door can serve as the "traffic node" of the whole house and also become the "wind path node" of the whole house, and link the three stages of "fresh air supply", "room fresh air replacement" and "dirty air discharge" of the whole house's two-way flow fresh air system through the door, has become an important technical issue in the fields of air conditioning and HVAC and construction. Summary of the invention

[0012] In order to solve the above problems, the present invention provides a room fresh air system with an electric damper, wherein the room is provided with a door, and the door comprises a door leaf; the room fresh air system comprises a room fresh air outlet, a room fan coil unit and a room return air duct, the room fresh air outlet is opened on the door leaf, and the electric damper is arranged in the door leaf; the electric damper comprises an electric drive device and a damper slide, the electric drive device extends a push rod, the damper slide is connected to the push rod, and the electric drive device drives the damper slide to open or close the room fresh air outlet through the push rod;

[0013] The return air outlet of the room return air duct is connected to the room, and the exhaust air outlet of the room return air duct is connected to the outside atmosphere;

[0014] The room fan coil unit is provided with an air outlet and an air intake port, and the distance between the room fresh air outlet and the air intake port of the room fan coil unit is smaller than the distance between the room fresh air outlet and the return air outlet of the room return air duct; when the fresh air replacement is in operation, the electric drive device drives the damper slide to open the room fresh air outlet through the push rod, and the room fan coil unit works. The fresh air entering the room from the room fresh air outlet and the air in the room can enter the room fan coil unit from the air intake port, and then be discharged from the air outlet at high speed, thereby promoting the air flow and fresh air replacement in the room, and the dirty air in the room is drawn out from the return air outlet of the room return air duct and then discharged outside the room.

[0015] Preferably, the room fresh air inlet is arranged at the upper part of the door leaf, and the room return air duct is located on the ceiling of the room.

[0016] Preferably, grilles are provided on both sides of the room fresh air outlet. When ventilation is in operation (the electric drive device drives the damper slide to open the room fresh air outlet through the push rod), the grilles block the light inside and outside the room and guide the airflow to the fan coil return air outlet; when the electric drive device drives the damper slide to close the room fresh air outlet through the push rod, the grilles on both sides of the room fresh air outlet are located on both sides of the damper slide.

[0017] Preferably, the grille includes a plurality of bars arranged in parallel from top to bottom, and the bars are inclined from the inner side of the door leaf to the outer side of the door leaf from top to bottom. When the ventilation is in operation (the electric drive device drives the damper slide to open the fresh air inlet of the room through the push rod), the grille guides the airflow to the ground.

[0018] Preferably, a slide guide groove is provided in the door leaf, and the damper slide slides along the slide guide groove under the drive of the electric drive device.

[0019] Preferably, the upper and lower ends of the slide guide groove are two extreme movement positions of the damper slide. When the damper slide slides toward the electric drive device until it abuts against one end of the slide guide groove, the air outlet is fully opened and the damper slide stops moving; when the damper slide slides away from the electric drive device until it abuts against the other end of the slide guide groove, the air outlet is fully closed and the damper slide stops moving.

[0020] Preferably, the door leaf is rotatably connected to the door frame via a hinge, a connecting terminal is provided on the axle pin of the hinge, and a power line of the electric drive device is connected to the connecting terminal.

[0021] Preferably, the damper sliding vane is a double-layer structure or a sandwich structure.

[0022] Preferably, the room fan coil unit comprises a return air box and a fan coil unit body, the return air box is provided with a fan assembly, the return air box is provided with the air suction port, and the air suction port is connected to the room;

[0023] The fan coil unit body comprises a shell and a heat exchanger arranged in the shell. The shell is provided with two ports, one port is connected with the return air box, and the other port is the air outlet, which is connected with the room.

[0024] Preferably, the return air outlet of the return air duct of the room is provided with an electric air valve.

[0025] Preferably, the electric air valve includes a cylindrical tube with an interlayer and an arc slide, one end of the cylindrical tube is sleeved on the room return air duct, and the other end is sealed; a vent is opened on the side wall of the cylindrical tube; the arc slide is arranged in the interlayer of the cylindrical tube, and the arc slide can close or open the vent when driven by an electric push rod.

[0026] Preferably, the cylindrical tube comprises an inner cylindrical sleeve and an outer cylindrical sleeve, the outer cylindrical sleeve is coaxially fixedly sleeved on the outer circumference of the inner cylindrical sleeve, and the interlayer is provided between the inner cylindrical sleeve and the outer cylindrical sleeve;

[0027] One end of the inner cylindrical sleeve is open and sleeved on one end of the circular air duct body; the other end of the inner cylindrical sleeve is sealed;

[0028] The two ends of the outer cylindrical sleeve are respectively sealed with the outer circumferential surface of the inner cylindrical sleeve;

[0029] The vent runs through the inner cylindrical sleeve and the outer cylindrical sleeve.

[0030] Preferably, the interlayer is further provided with a fixed arc piece for controlling the distance between the inner cylindrical sleeve and the outer cylindrical sleeve, the fixed arc piece is fixedly connected to the inner cylindrical sleeve and the outer cylindrical sleeve respectively, and the fixed arc piece is staggered with the vent;

[0031] The arc sliding sheet and the fixed arc sheet are arranged around the interlayer, and the arc sliding sheet moves axially along the two side walls of the fixed arc sheet under the drive of the electric push rod.

[0032] The present invention also provides a whole-house fresh air system with an electric damper, which is used for a room group, wherein the room group includes a plurality of rooms and a public space connected to each room; each room is provided with a door, and the door includes a door leaf; the feature is that each room includes the room fresh air system as described above, the room fresh air outlet of each room is connected to the public space, and the room fresh air outlet is provided with the electric damper as described above; the whole-house fresh air system includes:

[0033] A main air inlet is arranged on the outer wall of the public space, and is used to connect the public space with the outside atmosphere of the room group; a fresh air module is arranged on the main air inlet;

[0034] A main exhaust vent is arranged on the outer wall of the room group and communicates with the outside air of the room group; an exhaust module is arranged on the main exhaust vent;

[0035] The main exhaust duct is connected with the main exhaust port and is connected with each room through a plurality of room return air ducts.

[0036] Compared with the prior art, the present invention has the following technical effects:

[0037] 1. Save resources

[0038] The present invention arranges the larger electric damper components and the overall structure in the interlayer of the door leaf, develops the redundant space function of the interlayer of the door leaf, conceals the electromechanical structure, improves the decorative effect, and saves space resources;

[0039] 2. Sound insulation and heat insulation

[0040] The damper slide of the electric damper on the room door leaf of the present invention can be a double-layer structure or a sandwich structure, which has good sound insulation and heat insulation effects; when the electric damper is closed, the air circulation inside and outside the door is cut off, the room is soundproofed and heat-insulated inside and outside, and the privacy is good.

[0041] 3. Simple structure, high reliability, and air leakage rate close to zero

[0042] The electric air valve on the room return air duct of the present invention adopts a cylindrical tube with a sandwich layer, wherein the inner and outer layers are relatively fixed concentric cylindrical sleeves, and the middle sandwich layer is a fixed arc piece and an arc sliding piece used to fix and control the distance between the inner and outer cylindrical sleeves. The inner and outer cylindrical sleeves and the fixed arc piece of the middle layer can be directly cut from the corresponding pipe material, which is simple and easy to operate, has a simple structure and high reliability; and after the electric air valve is closed, due to the pressure difference between the inside and outside of the vent on the pipeline, the arc sliding piece is closely attached to the inner cylindrical sleeve, effectively closing the gap on the sliding surface between the arc sliding piece and the inner cylindrical sleeve, and the air leakage rate is extremely low, almost to zero;

[0043] 4. High mechanical strength and strong anti-deformation ability

[0044] The electric air valve on the room return air duct of the present invention adopts a cylindrical tube with an interlayer, wherein the inner and outer layers are relatively fixed concentric cylindrical sleeves, and the middle interlayer is a fixed arc piece and an arc sliding piece used to fix and control the distance between the inner and outer cylindrical sleeves. The arc sliding piece is always in the gap between the inner and outer cylindrical sleeves. The overall structure has high mechanical strength and strong anti-deformation ability.

[0045] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0047] Figure 1 A three-dimensional view of the fresh air replacement process using the secondary negative pressure of the room door fan coil unit;

[0048] Figure 2 A three-dimensional view of a door with an electric damper provided in the preferred embodiment 1 of the present invention;

[0049] Figure 3 A cross-sectional view of a door leaf with an electric damper provided in the preferred embodiment 1 of the present invention;

[0050] Figure 4 A fresh air replacement operation diagram of a room fresh air system with an electric damper provided in the preferred embodiment 1 of the present invention;

[0051] Figure 5 A schematic diagram of the structure of a room return air duct with an electric air valve provided in a preferred embodiment 2 of the present invention;

[0052] Figure 6 A schematic diagram of the structure of an electric air valve provided in a preferred embodiment 2 of the present invention;

[0053] Figure 7 A schematic diagram of the internal structure of an electric air valve provided in a preferred embodiment 2 of the present invention;

[0054] Figure 8 A cross-sectional view of the internal structure of an electric air valve provided in a preferred embodiment 2 of the present invention;

[0055] Fig. 9 The operation diagram of the electric air valve provided in the preferred embodiment 2 of the present invention when sucking air inwards (i.e. when the dirty air in the room is discharged outwards through the room return air duct);

[0056] Fig.10 A schematic diagram of the structure of the arc sliding vane provided in the preferred embodiment 2 of the present invention when the vent is closed;

[0057] Fig.11 An operation diagram of a whole-house fresh air system with an electric damper is provided for the preferred embodiment 3 of the present invention. DETAILED DESCRIPTION

[0058] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0059] Example 1

[0060] Please refer to Figures 2 to 4 , this embodiment provides a room fresh air system with an electric damper, the room is provided with a door 1, the door 1 includes a door leaf 12; the room fresh air system includes a room fresh air outlet 121, a room fan coil 5 and a room return air duct 4, the room fresh air outlet 121 is opened on the door leaf 12, and the electric damper is arranged in the door leaf 12; the electric damper includes an electric drive device 125 and a damper slide 123, the electric drive device 125 extends a push rod 124, the damper slide 123 is connected to the push rod 124, and the electric drive device 125 drives the damper slide 123 through the push rod 124 to open or close the room fresh air outlet 121;

[0061] The return air outlet of the room return air duct 4 is connected to the room, and the exhaust air outlet of the room return air duct 4 is connected to the outside atmosphere;

[0062] The room fan coil unit 5 includes a return air box and a fan coil unit body, the return air box is provided with a fan assembly, the return air box is provided with an air suction port 52, and the air suction port 52 is connected to the room; the fan coil unit body includes a shell and a heat exchanger arranged in the shell, the shell is provided with two ports, one end is connected to the return air box, and the other end is an air outlet 51, which is connected to the room; the distance between the room fresh air outlet 121 and the air suction port is smaller than the distance between the room fresh air outlet 121 and the return air outlet of the room return air duct 4; when the fresh air replacement is in operation, the electric drive The actuator 125 drives the damper slide 123 to open the room fresh air inlet 121 through the push rod 124, and the room fan coil unit 5 starts working. Under the action of the fan assembly in the room fan coil unit 5, the fresh air entering the room from the room fresh air inlet 121 and the air in the room can enter the room fan coil unit 5 from the air intake port 52, and then be discharged at a high speed from the air outlet 51 of the room fan coil unit 5, thereby promoting the air flow and fresh air replacement in the room, and the dirty air in the room is drawn out from the return air port of the room return air duct 4 and then discharged outside the room.

[0063] In this embodiment, when the electric drive device 125 drives the damper slide 123 to close the room fresh air inlet 121 through the push rod 124, under the action of the fan assembly in the room fan coil 5, the air in the room enters from the air intake port 52 of the room fan coil 5, is discharged through the air outlet 51, and then enters the air intake port 52 to achieve circulation in the room.

[0064] When the electric drive device 125 drives the damper slide 123 to open the room fresh air outlet 121 through the push rod 124, under the action of the fan assembly in the room fan coil 5, the fresh air outside the room enters the room from the room fresh air outlet 121, and then enters the room fan coil 5 from the air intake 52 of the room fan coil 5, and is discharged into the room through the air outlet 51. The fresh air squeezes the dirty air in the room and enters the room return air duct 4 from the return air outlet of the room return air duct 4, and then is discharged to the outside of the room, completing the fresh air replacement, and the fresh air replacement and internal circulation are carried out simultaneously.

[0065] In this embodiment, the room fresh air inlet 121 is arranged at the upper part of the door leaf 12, and the room return air duct 4 is located on the ceiling of the room.

[0066] The electric drive device 125 can drive the damper slide 123 to move up and down, horizontally, or tilted. This embodiment does not limit this. Preferably, the electric drive device 125 drives the damper slide 123 to slide up and down through the push rod 124. Since the room fresh air outlet 121 is located above the door leaf 12, the electric drive device 125 is located below the room fresh air outlet 121. A slide guide groove 126 is provided in the door leaf 12; the damper slide 123 slides along the slide guide groove 126 under the drive of the electric drive device 125. The length and width of the slide guide groove 126 are not less than the length and width of the damper slide 123, respectively, and the length and width of the damper slide 123 are not less than the length and width of the room fresh air outlet 121, respectively. The upper and lower ends of the slide guide groove 126 are the two movement limit positions of the air door slide 123. When the air door slide 123 slides toward the electric drive device 125 until it abuts against the lower end of the slide guide groove 126, the room fresh air outlet 121 is fully opened and the air door slide 123 stops moving; when the air door slide 123 slides away from the electric drive device 125 until it abuts against the upper end of the slide guide groove 126, the room fresh air outlet 121 is fully closed and the air door slide 123 stops moving.

[0067] In this embodiment, grilles 122 are fixedly provided on both sides of the room fresh air outlet 121, and a slide guide groove 126 is provided between the two grilles 122 for the air door slide 123 to be inserted. When the air door slide 123 closes the room fresh air outlet 121, the grilles 122 on both sides of the room fresh air outlet 121 are located on both sides of the air door slide 123, and the grilles 122 on both sides are separated by the air door slide 123. When the air door slide 123 opens the room fresh air outlet 121, the grilles 122 on both sides are connected.

[0068] The grille 122 includes a plurality of bars arranged in parallel from top to bottom, and the bars are inclined from the inside of the door leaf 12 to the outside of the door leaf 12 from top to bottom. When the air door slide 123 opens the room fresh air outlet 121, the fresh air outside the room can be blown toward the floor of the room through the room fresh air outlet 121, which is conducive to evaporating moisture from the floor of the room, and removing moisture and mildew from the public space and the room.

[0069] In this embodiment, the door 1 further comprises a door frame 11, and a door leaf 12 is rotatably connected to the door frame 11 via a hinge, that is, the hinge comprises a pin shaft and two leaves rotatably connected via the pin shaft, and the two leaves are respectively connected to the door leaf 12 and the door frame 11 via screws. A connection terminal 2 is provided on the pin shaft, and a power line 3 of the electric drive device 125 is connected to the connection terminal 2, so that the power line 3 can be connected flexibly without winding.

[0070] Example 2

[0071] This embodiment is further improved on the basis of embodiment 1. In this embodiment, please refer to Figures 5 to 10 , the return air outlet of the room return air duct 4 is also provided with an electric air valve 6. The electric air valve 6 comprises a cylindrical tube with an interlayer and an arc slide 63. One end of the cylindrical tube is open, and the open end is sleeved with the room return air duct 4, so that the inner channel of the cylindrical tube is connected with the room return air duct 4. The other end of the cylindrical tube is sealed. A vent 66 is provided on the side wall of the cylindrical tube. The arc slide 63 is arranged in the interlayer of the cylindrical tube, and the arc slide 63 can close or open the vent 66 under the drive of the electric push rod 124.

[0072] The cylindrical tube includes an inner cylindrical sleeve 61 and an outer cylindrical sleeve 62, wherein the outer cylindrical sleeve 62 is coaxially fixedly sleeved on the outer circumference of the inner cylindrical sleeve 61, and an interlayer is provided between the inner cylindrical sleeve 61 and the outer cylindrical sleeve 62. One end of the inner cylindrical sleeve 61 is open and sleeved on the room return air duct 4; the other end of the inner cylindrical sleeve 61 is sealed (i.e., sealed); the two ends of the outer cylindrical sleeve 62 are respectively sealed with the outer circumferential surface of the inner cylindrical sleeve 61, so as to prevent the wind in the cylindrical tube from overflowing from the interlayer when the arc slide 63 covers the vent 66. The vent 66 runs through the inner cylindrical sleeve 61 and the outer cylindrical sleeve 62, i.e., the inner cylindrical sleeve 61 and the outer cylindrical sleeve 62 are provided with vents 66 at the same position.

[0073] There is a gap between the inner cylindrical sleeve 61 and the outer cylindrical sleeve 62 to form a sandwich, and the sandwich is provided with a fixed arc piece 65 and an arc sliding piece 63. The fixed arc piece 65 is formed by a section of a circular tube with an axial groove on the side, and the groove runs through both ends of the circular tube. On the one hand, the fixed arc piece 65 plays the role of fixing the inner cylindrical sleeve 61 and the outer cylindrical sleeve 62, that is, the fixed arc piece 65 is fixedly connected to the inner and outer cylindrical sleeves of the cylindrical tube respectively (such as threaded connection, welding, bonding, etc.), and on the other hand, it is used to control the distance between the inner and outer cylindrical sleeves of the cylindrical tube. The arc sliding piece 63 is arranged on this groove, and the arc sliding piece 63 and the fixed arc piece 65 are surrounded by the sandwich of the cylindrical tube. The arc sliding piece 63 moves axially along the two side walls of the fixed arc piece 65 under the drive of the electric push rod 124, that is, the arc sliding piece 63 can slide axially on the above-mentioned groove.

[0074] In this embodiment, the vent 66 is located at the slot of the fixed arc piece 65, that is, the fixed arc piece 65 is staggered from the vent 66. The length and width of the vent 66 are respectively smaller than the length and width of the slot, and then the length and width of the arc sliding piece 63 are respectively larger than the length and width of the vent 66, in order to ensure that the arc sliding piece 63 can completely cover the vent 66, and prevent air leakage when the arc sliding piece 63 covers the vent.

[0075] In this embodiment, the circumferential angle of the fixed arc piece 65 is not less than the circumferential angle of the arc slide 63, and the height of the fixed arc piece 65 is greater than the height of the arc slide 63, so as to ensure that the arc slide 63 can slide axially on the groove of the fixed arc piece 65.

[0076] In this embodiment, the electric push rod 124 can be disposed inside the inner cylindrical sleeve 61 , or on the outer wall of the outer cylindrical sleeve 62 .

[0077] When the electric air valve 6 of this embodiment is in operation, the arc slide 63 slides in the middle layer driven by the electric push rod 124 to complete the opening and closing of the vent 66: when the arc slide 63 slides to leave the vent 66, the electric air valve 6 opens, and the air duct connecting the room return air duct 4 and the outside of the vent 66 is opened; when the arc slide 63 slides to completely cover the vent 66, the electric air valve 6 is closed, and the air duct connecting the room return air duct 4 and the outside of the vent 66 is cut off.

[0078] In this embodiment, the thickness of the fixed arc piece 65 is greater than the thickness of the arc sliding piece 63. When the dirty air in the room is discharged through the room return air duct 4, that is, the vent 66 is opened and the electric air valve 6 draws air inward, please refer to Fig. 9 , the inside of the cylindrical tube is negative pressure, and the outside of the cylindrical tube is positive pressure. The wind outside the vent 66 (i.e., the wind in the room) is sucked into the cylindrical tube through the vent 66; the outer cylindrical sleeve 62 is only used to limit the arc slide 63; after the vent 66 is closed, the pressure difference between the inside and outside of the air duct presses the arc slide 63 against the outer surface of the inner cylindrical sleeve 61, please refer to Fig.10 Therefore, the inner cylindrical sleeve 61 contains the air duct body.

[0079] Example 3

[0080] This embodiment is a further improvement on the basis of Embodiment 1 and Embodiment 2. Fig.11 This embodiment provides a whole-house fresh air system with an electric damper, which is used for a room group, wherein the room group includes multiple rooms and a public space connected to each room; each room is provided with a door 1, wherein the door 1 includes a door leaf 12; each room includes the room fresh air system described in Embodiment 1 and Embodiment 2, wherein the room fresh air outlet 121 of each room is connected to the public space, and the room fresh air outlet 121 is provided with the electric damper described in Embodiment 1 and Embodiment 2; the whole-house fresh air system includes:

[0081] A main air inlet is arranged on the outer wall of the public space, and is used to connect the public space with the outside atmosphere of the room group; a fresh air module 10 is arranged on the main air inlet;

[0082] A main exhaust vent is arranged on the outer wall of the room group and communicates with the outside air of the room group; an exhaust module 20 is arranged on the main exhaust vent;

[0083] The main exhaust duct is connected to the main exhaust port, and is connected to each room through a plurality of room return air ducts 4 respectively.

[0084] When the whole-house fresh air system is running, some rooms may not need fresh air replacement. Therefore, the room fresh air outlet 121 and the electric air valve 6 on the room return air duct 4 of these rooms can be selectively closed, and the room fresh air outlet 121 and the electric air valve 6 on the room return air duct 4 of the rooms that need fresh air replacement can be opened.

[0085] When the whole-house fresh air replacement is in operation in this embodiment, the fresh air module 10, the room fan coil 5 and the exhaust module 20 are started, and the fresh air positive pressure push of the fresh air module 10, the relay delivery of the room fan coil 5 and the dirty air negative pressure extraction of the exhaust module 20 are exerted at the same time, forming a "two-way flow" whole-house fresh air replacement; the whole process of room fresh air replacement is divided into three stages:

[0086] 1. Fresh air supply section

[0087] The fresh air module 10 inhales fresh air from the environment and performs pre-processing such as filtering, cooling and dehumidification (heating), and then directly delivers the fresh air with the temperature, humidity and cleanliness standards to the living room corridor in the suite as a public space, directly to the door 1 of each room;

[0088] 2. Fresh air replacement section

[0089] Under the secondary negative pressure generated by the suction port 52 of the room fan coil unit 5 arranged close to the room fresh air outlet 121 on the basis of the primary negative pressure generated by the suction of the return air outlet of the room return air duct 4, the suction port 52 of the room fan coil unit 5 is in the lowest pressure area of ​​the room, and a large pressure difference is formed between the room fresh air outlet 121 and the suction port 52 of the room fan coil unit 5 arranged close to each other. The fresh air from the door 1 quickly rushes into the room through the room fresh air outlet 121, and is sucked in by the room fan coil unit 5 to increase the pressure and accelerate to the side of the outer wall of the room, and then flows back to the side of the inner wall where the door 1 is located after being reflected by the outer wall, forcing the dirty air in the room to enter the room return air duct 4;

[0090] 3. Dirty air discharge section

[0091] The dirty air entering the room return air duct 4 quickly flows into the main exhaust duct, enters the exhaust module 20, is pressurized again by the exhaust fan, and finally is discharged to the outdoor atmosphere for diffusion.

[0092] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A room fresh air system with an electric damper, wherein the room is provided with a door, and the door comprises a door leaf; characterized in that: The room fresh air system comprises a room fresh air outlet, a room fan coil unit and a room return air duct, the room fresh air outlet is opened on the door leaf, and the electric damper is arranged in the door leaf; the electric damper comprises an electric drive device and a damper slide, the electric drive device extends a push rod, the damper slide is connected to the push rod, and the electric drive device drives the damper slide to open or close the room fresh air outlet through the push rod; The return air outlet of the room return air duct is connected to the room, and the exhaust air outlet of the room return air duct is connected to the outside atmosphere; The room fan coil unit is provided with an air outlet and an air intake port, and the distance between the room fresh air outlet and the air intake port of the room fan coil unit is smaller than the distance between the room fresh air outlet and the return air outlet of the room return air duct; when the fresh air replacement is in operation, the electric drive device drives the damper slide to open the room fresh air outlet through the push rod, and the room fan coil unit works, and the fresh air entering the room from the room fresh air outlet and the air in the room can enter the room fan coil unit from the air intake port, and then be discharged from the air outlet at a high speed, so as to promote the air flow and fresh air replacement in the room, and the dirty air in the room is drawn out from the return air outlet of the room return air duct and then discharged to the outside of the room; The return air outlet of the return air duct in the room is provided with an electric air valve; The electric air valve includes a cylindrical tube with an interlayer and an arc slide. One end of the cylindrical tube is sleeved on the room return air duct, and the other end is sealed. A vent is opened on the side wall of the cylindrical tube. The arc slide is arranged in the interlayer of the cylindrical tube, and the arc slide can close or open the vent when driven by an electric push rod.

2. A room fresh air system with an electric damper according to claim 1, characterized in that: The room fresh air inlet is arranged at the upper part of the door leaf, and the room return air duct is located on the suspended ceiling of the room.

3. A room fresh air system with an electric damper according to claim 1, characterized in that: Grilles are provided on both sides of the room fresh air outlet. When the electric drive device drives the air door slide to close the room fresh air outlet through the push rod, the grilles on both sides of the room fresh air outlet are located on both sides of the air door slide.

4. A room fresh air system with electric damper according to claim 3, characterized in that: The grille includes a plurality of bars which are sequentially arranged in parallel from top to bottom, and the bars are inclined from the inner side of the door leaf to the outer side of the door leaf from top to bottom.

5. A room fresh air system with electric damper according to claim 3, characterized in that: A sliding vane guide groove is arranged in the door leaf, and the air door sliding vane slides along the sliding vane guide groove under the drive of the electric drive device.

6. A room fresh air system with electric damper according to claim 5, characterized in that: The upper and lower ends of the slide guide groove are two extreme movement positions of the damper slide. When the damper slide slides toward the electric drive device until it abuts against one end of the slide guide groove, the vent is fully opened and the damper slide stops moving; when the damper slide slides away from the electric drive device until it abuts against the other end of the slide guide groove, the vent is fully closed and the damper slide stops moving.

7. A room fresh air system with electric damper according to claim 1, characterized in that: The door leaf is rotatably connected to the door frame via a hinge, a connecting terminal is provided on the shaft pin of the hinge, and a power line of the electric drive device is connected to the connecting terminal.

8. A room fresh air system with electric damper according to claim 1, characterized in that: The air door sliding vane is a double-layer structure or a sandwich structure.

9. A room fresh air system with electric damper according to claim 1, characterized in that: The room fan coil unit comprises a return air box and a fan coil unit body, the return air box is provided with a fan assembly, the return air box is provided with an air suction port, and the air suction port is connected to the room; The fan coil unit body comprises a shell and a heat exchanger arranged in the shell. The shell is provided with two ports, one port is connected with the return air box, and the other port is the air outlet, which is connected with the room.

10. A room fresh air system with electric damper according to claim 1, characterized in that: The cylindrical tube comprises an inner cylindrical sleeve and an outer cylindrical sleeve, wherein the outer cylindrical sleeve is coaxially fixedly sleeved on the outer circumference of the inner cylindrical sleeve, and the interlayer is provided between the inner cylindrical sleeve and the outer cylindrical sleeve; One end of the inner cylindrical sleeve is open and sleeved on one end of the room return air duct; the other end of the inner cylindrical sleeve is sealed; The two ends of the outer cylindrical sleeve are respectively sealed with the outer circumferential surface of the inner cylindrical sleeve; The vent runs through the inner cylindrical sleeve and the outer cylindrical sleeve.

11. A room fresh air system with electric damper according to claim 10, characterized in that: The interlayer is also provided with a fixed arc piece for controlling the distance between the inner cylindrical sleeve and the outer cylindrical sleeve, the fixed arc piece is fixedly connected to the inner cylindrical sleeve and the outer cylindrical sleeve respectively, and the fixed arc piece is staggered with the vent; The arc sliding sheet and the fixed arc sheet are arranged around the interlayer, and the arc sliding sheet moves axially along the two side walls of the fixed arc sheet under the drive of the electric push rod.

12. A whole-house fresh air system with electric dampers, used in a room group, the room group includes multiple rooms and a public space connected to each room; each room is provided with a door, the door includes a door leaf; characterized in that: Each room includes the room fresh air system as claimed in any one of claims 1 to 11, the room fresh air outlet of each room is connected to the public space, and the room fresh air outlet is provided with the electric damper as claimed in any one of claims 1 to 11; the whole-house fresh air system includes: A main air inlet is arranged on the outer wall of the public space, and is used to connect the public space with the outside atmosphere of the room group; a fresh air module is arranged on the main air inlet; A main exhaust vent is arranged on the outer wall of the room group and communicates with the outside air of the room group; an exhaust module is arranged on the main exhaust vent; The main exhaust duct is connected with the main exhaust port and is connected with each room through a plurality of room return air ducts.

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