WO2022247958A1

WO2022247958A1 - Room fresh air system using secondary negative pressure to send fresh air, and whole-house fresh air system

Info

Publication number: WO2022247958A1
Application number: PCT/CN2022/102283
Authority: WO
Inventors: 薛世山; 周萍; 李成伟; 诸葛水明; 徐言先; 韦林林; 胡用; 刘帅帅; 吴飞飞; 王恒; 马骥; 应小勇; 王庆伦
Original assignee: 上海伯涵热能科技有限公司
Priority date: 2021-05-28
Filing date: 2022-06-29
Publication date: 2022-12-01

Abstract

A room fresh air system (2) using secondary negative pressure to send fresh air, and a whole-house fresh air system, wherein the room fresh air system (2) comprises: a room fresh air port (24), provided on an enclosure structure of the room (1) for introducing fresh air from outside the room (1) into the room (1); a room air discharge pipe (23), configured to discharge dirty air in the room (1) out of the room (1); a fan coil unit (22), arranged inside the room (1) and comprising a housing, wherein the housing is provided with an air outlet port (221) and an air suction port (222), and the distance between the room fresh air port (24) and the air suction port (222) is less than the distance between the room fresh air port (24) and an air discharge port of the room air discharge pipe (23). The housing is internally provided with a fan (223), and under the action of the fan (223), the fresh air entering the room (1) from the room fresh air port (24) and the air in the room (1) can enter the fan coil unit (22) by means of the air suction port (222), and then get discharged at a high speed by means of the air outlet port (221), such that the air inside the room (1) is pushed to flow and the fresh air replaces the air, and the dirty air in the room (1) is suctioned out by means of the air discharge port of the room air discharge pipe (23) and then discharged to the outside of the room (1).

Description

A room fresh air system and a whole house fresh air system using secondary negative pressure to send fresh air into the room

technical field

The invention relates to the technical field of air exchange system design, in particular to a room fresh air system and a whole house fresh air system utilizing secondary negative pressure to send fresh air into a room.

Background technique

In the ventilation system of buildings including residential buildings, a commonly used negative pressure ventilation method is to use negative pressure main exhaust duct and room return duct to draw air, and rely on the negative pressure power of the return duct to realize the replacement of room fresh air, which saves The fan used as the driving force for room airflow reduces the difficulty and workload of fresh air system installation. However, after this negative pressure ventilation method loses the air supply power of the air replacement inside the room, in order to prevent the fresh air in the room from going straight from the fresh air outlet to the return air outlet and cause a short circuit of the fresh air, it is required that the return air duct in the room should be set far from the fresh air outlet. (The distance should be kept as far as possible in the horizontal direction and the vertical direction), resulting in an increase in the length of the return air pipeline, an increase in the installation workload, and an increase in the resistance of the airflow along the way, and there is still a large area around the main body of the ventilation airflow in the room. The ventilation blind area, as shown in Figure 1.

Another ventilation method that combines positive and negative pressure is to use the fan coil unit at the door of the room as the end of the central air conditioner to make it circulate in the room and replace fresh air with "one machine for two purposes". When the fresh air is replaced, the fresh air from the public space such as the residential aisle flows into the room through the fresh air connecting pipe and the fan coil is pressurized and discharged. The fresh air gains kinetic energy and shoots to the opposite wall, forcing the dirty air to flow to the room return air duct; this has room air circulation power The room fresh air replacement method can increase the agitation of the room airflow, greatly reduce the blind area of ventilation, and the fresh air replacement effect is good; and the room return air duct can be set arbitrarily, even near the fresh air outlet; however, this positive and negative Combined with the ventilation mode, the fan coil unit in the room should be equipped with a special module for the internal circulation of the room air conditioner and the fresh air replacement "one machine with two uses", and the fresh air connecting pipe should also be installed, and the fresh air connecting pipe should pass through the ceiling from the aisle upwards during interior decoration, and then The crossbeam that traverses across the top of the door of the room needs to be accurately docked and assembled with the fresh air inlet of the fan coil unit module, which requires a large amount of work and requires relatively high installation accuracy, as shown in Figure 2.

Contents of the invention

In order to solve the above problems, the present invention provides a fresh air system that uses secondary negative pressure to send fresh air into the fresh air room, including:

The fresh air outlet of the room is set on the enclosure structure of the room, and is used to pass the fresh air outside the room into the room;

The room return air duct is used to discharge the dirty air in the room to the outside of the room;

The fan coil unit is arranged in the room, and it includes a housing, and the housing is provided with an air outlet and an air suction port, and the distance between the room fresh air port and the air suction port is smaller than the distance between the room fresh air port and the air suction port. The distance between the return air outlets of the room return air pipe; the housing is provided with a fan, and under the action of the fan, the fresh air entering the room from the new air outlet of the room and the air in the room can be drawn from the air suction port. Enter the fan coil unit, and then discharge from the air outlet at a high speed to promote the air flow in the room and replace it with fresh air. The dirty air in the room is drawn out from the return air outlet of the room return air duct and then discharged out of the room.

Preferably, the room fresh air outlet is set on the wall of the room, on the head of the room door or on the rotating door leaf of the room door.

There is a damper on the fresh air outlet of the room. When the damper is closed, the air in the room enters the fan coil from the air suction port under the action of the fan, and is discharged through the air outlet. Enter the air suction port to realize the internal circulation of the air in the room;

When the air door is opened, under the action of the fan, the fresh air outside the room enters the room from the fresh air outlet of the room, enters the fan coil from the air suction port, and is discharged into the room through the air outlet. , the fresh air drives the dirty air in the room to enter the room return air duct from the air return port of the room return air duct, and then be discharged to the outside of the room to complete the fresh air replacement.

Preferably, the fan coil unit is an indoor unit of a split air conditioner, including a wall-mounted unit, a cabinet unit, a concealed fan coil unit, and an exposed fan coil unit; the indoor unit is connected to the outdoor unit of the split air conditioner Constitutes the refrigerant circulation loop.

Preferably, the fan coil unit is a fan coil unit installed on the ceiling at the end of a central air-conditioning water machine or an indoor unit at the end of a central air-conditioning fluorine machine;

The fan coil unit is connected to the outdoor unit of the central air-conditioning water machine to form a cold and hot water circulation circuit, or connected to the outdoor unit of the central air-conditioning fluorine machine to form a refrigerant circulation circuit.

Preferably, the air suction port of the fan coil unit is set close to the room fresh air port, and the return air port of the room air return pipe is set away from the room fresh air port.

The present invention also provides a whole-house fresh air system, which is used in room groups. The room group includes a plurality of rooms and a public space connected to each room, wherein each room includes the above-mentioned room fresh air system, and the room fresh air outlet of each room It communicates with the public space; the whole house fresh air system includes:

The general air inlet is arranged on the outer wall of the public space to realize the communication between the public space and the outside air of the group of rooms, and the general air inlet is provided with a fresh air module;

The main air exhaust port is arranged on the outer wall of the room group and communicates with the outside air of the room group; the general air exhaust port is provided with a general air exhaust module;

The main air exhaust pipe communicates with the general air exhaust outlet, and communicates with each room through several room air return pipes.

The present invention also provides a whole-house fresh air system, which is used in a room group, and the room group includes a plurality of rooms and a public space connected to each room; the whole-house fresh air system includes:

The general air inlet is arranged on the outer wall of a room, communicated with the outside air of the room group, and the fresh air module is arranged on the said general air inlet; the ventilation module connected with the public space is arranged on the inner wall of this room. The other rooms include the above-mentioned room fresh air system, and the room fresh air outlets of other rooms communicate with the public space;

The general air inlet is set on the outer wall of a room, and communicates with the outside air of the room group. The general air inlet is provided with a fresh air module; the general air inlet is provided with a general air supply pipe. The air supply pipe passes through this room and communicates with the public space;

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

1. Increase the air agitation in the room and compress the blind area of ventilation

The room fresh air outlet is set close to the room fan coil suction outlet, and the room fresh air outlet is set far from the room return air duct return air outlet, that is, the distance between the room fresh air outlet and the room return air duct is smaller than the room fresh air outlet and the room return air duct. The distance between the return air outlets effectively utilizes the secondary negative pressure generated by the suction of the fan coil unit near the fresh air outlet of the room on the basis of the primary negative pressure generated by the suction of the room return air duct, so that the fan coil unit The suction port is located in the lowest pressure area of the room, and the maximum pressure difference is formed between the fresh air port of the adjacent room and the suction port of the fan coil unit, driving the fresh air at the door to quickly flow into the room, and the fan coil unit inhales and boosts the pressure to accelerate to the room The opposite wall is reflected by the opposite wall and then flows back to the lower part of the room, forcing the dirty air in the room to enter the return air duct of the room, thereby increasing the air agitation in the room and eliminating the blind area of ventilation;

2. Eliminates the need for passing through the ceiling, cross-beam fresh air connecting pipes and complex installation projects

The room fresh air outlet is set close to the fan coil suction outlet and the room fresh air outlet is set far from the room return air return duct. Both are free settings without rigid connections. As long as the room fresh air outlet, fan coil suction outlet, and room The "far" and "near" spatial relationship between the three "ports" of the return air outlet can effectively use the primary negative pressure generated by the suction of the room return air duct to draw air from the suction port of the fan coil unit that is set close to the fresh air outlet of the room. The secondary negative pressure generated by suction pulls the fresh air from the aisle into the room, high-quality implementation of room fresh air replacement, eliminating the need for complicated fresh air connecting pipes passing through the ceiling and beams and their installation projects.

Of course, any product implementing the present invention does not necessarily need to achieve all the above-mentioned advantages at the same time.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without any creative work. In the attached picture:

Fig. 1 is the top view of the room fresh air replacement process in the existing ventilation mode where the room fresh air outlet and the return air outlet are far away and there is a ventilation blind zone;

Fig. 2 is the room fresh air replacement process in which the fan coil at the door of the room draws the fresh air from the aisle through the fresh air connecting pipe passing through the ceiling and the beam in the existing positive and negative pressure combined residential ventilation mode;

Figure 3 is a schematic diagram of the ventilation structure and operation of the room fresh air replacement process where there is no positive pressure high-speed delivery of the fresh air outlet and only the negative pressure of the room return air pipe to extract dirty air;

Fig. 4 is a fresh air system that uses secondary negative pressure to send fresh air into the room provided by the preferred embodiment 1 of the present invention. When the room return air pipe stops sucking, the fan coil drives the air to flow between the upper space of the room and the room air conditioner when the air conditioner circulates inside the room. Air pressure distribution curve in the lower space;

Fig. 5 is a room fresh air system provided by preferred embodiment 1 of the present invention, which utilizes secondary negative pressure to send fresh air into the fresh air room. Top view of room fresh air replacement process;

Fig. 6 is a room fresh air system provided by preferred embodiment 1 of the present invention, which utilizes secondary negative pressure to send fresh air into the room. Three-dimensional view of the room fresh air replacement process (the room fresh air outlet is set above the door frame of the room);

Fig. 7 is a room fresh air system provided by the preferred embodiment 1 of the present invention, which utilizes secondary negative pressure to send fresh air into the room. Three-dimensional view of the room fresh air replacement process (the room fresh air outlet is set on the upper part of the room's rotatable door leaf);

Fig. 8 is a kind of room fresh air replacement provided by the preferred embodiment 1 of the present invention, which uses secondary negative pressure to send fresh air into the fresh air room fresh air system. The secondary negative pressure generated by the suction of the tuyere is superimposed, the air pressure at the door head of the room is lower than that of the internal circulation, and the fresh air outside the room pours into the room with greater power. The air pressure distribution curve;

Fig. 9 is the operation diagram of the room fresh air system provided by the preferred embodiment 2 of the present invention with the indoor unit of the split air conditioner as the relay power (providing secondary negative pressure);

Fig. 10 is a structural schematic diagram of a fresh air system and a whole-house fresh air system that use secondary negative pressure to send fresh air into the fresh air room provided by preferred embodiment 3 of the present invention (fresh air is sent into the suite through the living room aisle);

Fig. 11 is a schematic structural diagram of a fresh air system and a whole house fresh air system provided by preferred embodiment 4 of the present invention using secondary negative pressure to send fresh air into the room (fresh air passes through a room and is sent into the suite);

Fig. 12 is a structural schematic diagram of a room fresh air system and a whole house fresh air system provided by preferred embodiment 5 of the present invention using secondary negative pressure (fresh air is sent into the suite across a room through the air supply pipe).

Detailed ways

The interior walls, exterior walls, doors and windows of the current building divide the original spacious and open building space into several spatial units. Taking a residence as an example, the interior walls, exterior walls, doors and windows divide the originally spacious and open building space of about 100 square meters into several functional units such as living room, bedroom, study room, kitchen, bathroom, and storage room. Achieving natural ventilation, even forced ventilation is difficult to operate.

Residential ventilation is faced with many resistance problems: multiple walls on the exterior wall and interior wall block the airflow, there are still ventilation blind areas behind multiple obstacles in the residential suite, and there are also measures to achieve suitable indoor temperature, humidity, and cleanliness goals. Fresh air filtration, heat exchange, etc., all of which make residential ventilation need to pressurize the airflow multiple times to promote airflow delivery.

The key difficulty of residential ventilation lies in room ventilation, because, even if the whole house general air intake module and total exhaust air module are installed, it has the ability to send fresh air to the fresh air outlets of each room through the living room aisle, and to pass the dirty air of each room through the room. If the return air duct and the main exhaust duct are drawn outdoors, if the fresh air outlet in the room does not have relay air supply power, but only relies on the positive air supply pressure in the living room aisle and the negative pressure power of the room return air duct to achieve high-efficiency fresh air replacement in the room, It is still impossible: First, there are a large number of air leakage channels to the external environment of the house in the aisle of the living room, so that the fresh air delivered from the aisle of the living room to the door of each room can only be a "micro-positive pressure" of 1pa level, and it is impossible to be 10 ¹ pa , 10 ² pa-level "positive pressure", driven by this "micro-positive pressure", it is difficult for the fresh air in the aisle of the living room to pass through the fresh air outlet of the room to produce a speed of more than 3m/s and the corresponding dynamic pressure head, and it is difficult to control the airflow field inside the room Generate a strong "stirring"; secondly, the negative pressure in the room generated by the general exhaust module, the general exhaust pipe and the room return air pipe is not enough to pull the fresh air at the fresh air outlet of the room to generate a speed of more than 3m/s and the corresponding Dynamic pressure head, especially when the return air outlet of the room return air duct is set close to or even on the same side as the room fresh air outlet, there will also be a serious fresh air short circuit, that is, the fresh air flow entering the room fresh air outlet does not obtain a higher dynamic pressure head Make it flow into the main space of the room, but follow the path with the shortest distance and the least resistance between the fresh air outlet of the room and the return air outlet of the return air duct to the return air duct of the room, which greatly reduces the replacement effect of fresh air in the room and wastes Fresh wind resources are obtained, as shown in Figure 3.

The present invention provides a fresh air system and a whole-house fresh air system that use secondary negative pressure to send fresh air into the room. For the above-mentioned "even if the whole house is equipped with a total air intake module and a total exhaust air module, it has the ability to pass fresh air through the total air intake module and The corridor in the living room is delivered to the fresh air outlets of each room, and the dirty air in each room is extracted outdoors through the room return air duct, the main exhaust pipe and the main exhaust module. And the negative pressure power of the room return air pipe still cannot prevent the short circuit of the fresh air in the room and cannot realize the high-efficiency fresh air replacement in the room. The indoor unit of the terminal or split air conditioner, that is, the function of the fan coil in each room, is expanded. It is not only used as the power of the internal circulation of the room air conditioner, but also as the relay power for the replacement of fresh air in the room. "; the present invention does not set the rigid fresh air connecting pipe between the air supply space such as the living room aisle and the fan coil suction port of the room, and maintains the space setting freedom of the fan coil unit in the room; the fresh air port of the room of the present invention can be provided with a damper, when the damper is opened , implement internal circulation and fresh air replacement "one machine with two functions", when the damper is closed, only the internal circulation of the room is implemented; the present invention only requires the establishment of the control room fresh air outlet, fan coil suction outlet, and the return air outlet of the room return air duct Appropriate spatial relative relationship among them, that is, it is required that the fresh air outlet of the room is set close to the suction outlet of the fan coil unit, and the fresh air outlet of the room is set far from the return air outlet of the return air pipe of the room, that is, between the fresh air outlet of the room and the suction outlet of the fan coil unit The distance is less than the distance between the fresh air outlet of the room and the return air outlet of the room return air duct.

The present invention uses secondary negative pressure to send fresh air into the room. When the fresh air system is in operation, the damper of the fresh air outlet in the room is opened, the dirty air in the room is exhausted by the return air outlet in the room, the fan coil in the room is running, and the exhaust air in the room is generated once. Negative pressure, on the basis of this negative pressure, the fan coil operates to generate a secondary negative pressure at the suction port of the fan coil, so that the suction port of the fan coil is in the lowest pressure area of the room. A large pressure difference is formed between the suction outlets, which pulls the fresh air into the room quickly and is inhaled by the fan coil suction outlet to increase the pressure. It is ejected from the air outlet of the fan coil at high speed, and the injected fresh air flows through the wall opposite the fan coil to reflect and then flow back. To the side where the fan coil unit is located, the dirty air in the room is forced to enter the negative pressure return air outlet of the room which is set far from the fresh air outlet of the room, forming a high-efficiency two-way fresh air replacement effect in the room.

A fresh air system and a whole house fresh air system provided by the present invention will be described in detail in conjunction with Fig. 4 to Fig. 12. The following embodiments are implemented on the premise of the technical solution of the present invention. Detailed implementation and specific operation process are given, but the scope of protection of the present invention is not limited to the following examples, and those skilled in the art can modify and polish it within the scope of not changing the spirit and content of the present invention .

Example 1

Please refer to Figure 4 to Figure 8, a fresh air system 2 that uses secondary negative pressure to send fresh air into the room, including:

The room fresh air outlet 24 is set on the enclosure structure of the room 1, and is used to pass the fresh air outside the room 1 into the room 1. The present invention does not specifically limit where the room fresh air outlet 24 is set in the room. For example, it can be set on the wall of room 1, or it can be set on the door head of the door 11 of room 1, or it can be set on the door of room 1. On the leaf of door 11. In this embodiment, if the room fresh air outlet 24 is arranged on the wall of the room 1 , then the room fresh air outlet 24 is preferably arranged on the inner wall of the room 1 . In order to reduce openings in the wall, in this embodiment, the room fresh air outlet 24 can be arranged on the door head of the room 1, that is, on the door head above the door 11 (please refer to FIG. 6 ), or on the door head of the room 11. on the rotating door leaf (please refer to Figure 7). In order to simplify the structure and construction process, the door 11 can not be provided with a door head, and the door frame can be made higher, that is, the door leaf is also made higher. Therefore, the room fresh air outlet 24 can be arranged on the upper or middle part or the lower part of the door leaf. Specifically, it can be determined according to the setting positions of the air return port of the room return air pipe and the air suction port of the fan coil unit. Please refer to FIG. 7, which shows that the room fresh air port 24 is arranged on the upper part of the door leaf.

The room return air pipe 23 has an air return port 231 at one end and is installed in the room 1;

The fan coil unit 22 is arranged in the room 1 and includes a casing, the casing is provided with an air outlet 221 and an air suction port 222, and the distance between the room fresh air port 24 and the air suction port 222 is less than the specified The distance between the fresh air outlet 24 of the room and the return air outlet 231 of the air return duct 23 of the room; a fan 223 is arranged in the housing, and under the action of the fan 223, air entering the room from the fresh air outlet 24 of the room The fresh air and the air in the room can enter the fan coil unit 22 from the air suction port 222, and then be discharged at high speed from the air outlet 221 to promote the air flow in the room and replace it with fresh air, and the dirty air in the room will return from the room. The air return port 231 of the air duct 23 is drawn out and then discharged to the outside of the room.

In this embodiment, the fresh air port 24 of the room is provided with a damper 21. When the damper 21 is closed, under the action of the fan 223, the air in the room enters from the suction port 222, passes through the After being discharged from the air outlet 221, it enters the air suction port 222 to realize circulation in the room;

When the air door 21 is opened, under the action of the fan 223, the fresh air outside the room enters the room from the fresh air port 24 of the room, and then enters the fan coil unit 22 from the air suction port 222, and passes through the The air outlet 221 is discharged into the room, and the fresh air squeezes the dirty air in the room into the room return duct 23 from the return air outlet 231 of the room return duct 23, and then is discharged to the outside of the room to complete the fresh air replacement. The replacement is performed synchronously with the inner loop.

The damper 21 can be set on the fresh air outlet 24 of the room, and the damper 21 can also not be set, which can be set according to actual use requirements. If the air door 21 is not set on the room fresh air outlet 24, then when the room fresh air system is in operation, the fresh air replacement and internal circulation are carried out synchronously.

A heat exchanger is also provided in the housing, and the heat exchanger is connected to a cycle unit that provides heat exchange medium for it. In this embodiment, the fan coil unit 22 is an indoor unit of a split air conditioner, and the indoor unit is connected with the outdoor unit of the split air conditioner to form a refrigerant circulation circuit. Under the action of the fan 223 , air enters the housing from the air suction port 222 , passes through the heat exchanger, and is discharged from the air outlet 221 . This embodiment does not limit the specific type of air conditioner. For example, it can be a central air conditioner, a split air conditioner, or a combination of a central air conditioner and a split air conditioner. For example, the fan coil unit is a wall-mounted machine or a cabinet machine. , Concealed fan coil unit or exposed fan coil unit, the outdoor unit is the central air-conditioning water machine outdoor unit, the central air-conditioning fluorine machine outdoor unit or the outdoor unit of the split air conditioner, each indoor unit and each outdoor unit can be randomly combined. Specifically, as an embodiment, the fan coil unit is the fan coil unit at the end of the central air-conditioning water machine or the indoor unit at the end of the central air-conditioning fluorine machine installed on the ceiling in the room, and the fan coil unit is installed on the room ceiling The fan coil at the end of the central air-conditioning water machine or the indoor unit at the end of the central air-conditioning fluorine machine, the fan coil is connected with the outdoor unit of the central air-conditioning water machine to form a cold and hot water circulation loop, or connected with the central air-conditioning fluorine machine The outdoor units are connected to form a refrigerant circulation loop. As a second embodiment, the fan coil unit is an indoor wall-mounted unit of a split-type air conditioner installed on the inner wall of the room or an indoor fan coil unit of a split-type air conditioner installed on the ceiling in the room, the indoor wall-mounted unit Or the indoor fan coil unit is connected with the outdoor unit of the split air conditioner to form a refrigerant circulation loop. It can be seen from the above that no matter what type of air conditioner it is, it is applicable to the fan coil unit 22 provided in this embodiment.

The fan coil unit 22 in this embodiment takes the end of a central air-conditioning unit as an example. The fan coil unit 22 is installed on the ceiling in the room 1 and is close to the door 11. The fan coil unit 22 is close to the fresh air outlet of the room. 24, the air return port of the room return duct 23 is set away from the room fresh air port 24, and the air outlet 221 of the fan coil unit 22 is higher than the air suction port 222.

The fresh air system provided by this embodiment uses secondary negative pressure to send fresh air into the room, and merges the fresh air system based on the household central air-conditioning system, and expands the functions of the end of the household central air-conditioning system, that is, the fan coil unit 22 in each room. The power of the internal circulation of the air conditioner in the room is also used as the relay power for the replacement of fresh air in the room, and the implementation of internal circulation and fresh air replacement "one machine with two uses"; this embodiment does not set the air supply space such as the living room aisle and the fan coil unit 22 in the room and the suction port 222 Rigid fresh air connection pipes between them maintain the degree of freedom in the space setting of the fan coil unit 22 in the room; in this embodiment, the fresh air outlet 24 in the room can be provided with a damper 21, and when the damper 21 is opened, the internal circulation and fresh air replacement "one machine with two uses" is implemented. When the damper 21 is closed, only the internal circulation is implemented; this embodiment requires the establishment of an appropriate spatial relative relationship between the fresh air outlet 24 of the control room, the suction outlet 222 of the fan coil unit 22, and the return air outlet 231 of the room, that is, the fresh air outlet of the room is required 24 is set close to the air suction port 222 of the fan coil unit 22, and the room fresh air port 24 is set far from the room return air port 231, that is, the air circulation distance between the room fresh air port 24 and the fan coil unit 22 suction port 222 is smaller than the room fresh air port 24 The air circulation distance between the return air outlet 231 of the room return air duct 23.

When the internal circulation of the fresh air system provided by this embodiment is sent into the fresh air room by secondary negative pressure, the fan coil unit 22 starts to run, and the fan 223 boosts the inhaled indoor air and flows through the heat exchanger for cooling and dehumidification (or heating and heating) ), and then shoot out from the high position of the air outlet 221 of the fan coil unit 22, reflect on the opposite wall (and/or doors and windows) of the room and then flow back to the wall on the side where the fan coil unit 22 is located, compressing the air in the lower part of the room to be sucked from the fan coil unit 22 The tuyere 222 replenishes into the fan coil unit 22 to start the next cycle. Air pressure distribution during the internal circulation of the room air conditioner: the airflow pressure in the upper part of the room is high, the airflow pressure in the lower part of the room is low, the airflow pressure of the air outlet 221 of the fan coil unit 22 is the highest, and the airflow pressure of the air inlet 222 of the fan coil unit 22 is the lowest, as shown in Figure 4 As shown in the figure, the arrow line running from left to right is the direction of the upper airflow in the internal circulation room, and the line above the corresponding central axis that slopes downward from left to right is the pressure distribution of the upper airflow in the internal circulation room; from right to The arrow line going left is the direction of the airflow in the lower part of the internal circulation room, and the corresponding straight line below the central axis from right to left is the pressure distribution of the airflow in the lower part of the internal circulation room.

When the fresh air replacement system provided by this embodiment uses secondary negative pressure to send fresh air into the fresh air room, the room fresh air outlet 24 damper 21 is opened, the room return air outlet 231 exhausts the dirty air in the room, and the room fan coil unit 22 operates. The air return port 231 generates primary negative pressure in the room, and the suction port 222 of the fan coil unit 22 generates a secondary negative pressure on the basis of the primary negative pressure generated by the return air port 231 in the room, so that the suction port 222 of the fan coil unit 22 In the lowest pressure area of the room, a large pressure difference is formed between the fresh air outlet 24 of the adjacent room and the air suction port 222 of the fan coil unit 22, which pulls the fresh air into the room quickly and is sucked by the air suction port 222 of the fan coil unit 22, increasing the pressure. Afterwards, it is ejected at high speed from the air outlet 221 of the fan coil unit 22, and the injected fresh air flows through the opposite wall to reflect and then flows back to the side of the inner wall where the door is located, forcing the dirty air in the room to enter the room negative pressure set far from the room fresh air outlet 24 The air return port 231 forms a high-efficiency two-way flow fresh air replacement effect in the room, as shown in Fig. 5 to Fig. 7 .

When implementing room fresh air replacement, because the room return air pipe 23 suction makes the room as a whole negative pressure, so that the negative pressure of the suction port 222 of the fan coil unit 22 is lower than that of the internal circulation, and the pressure difference between the room and the outside of the room is larger , the power of fresh air outside the room pouring into the room is greater, which is conducive to the entry of fresh air into the room. The fresh air outside the room pours into the room from the fresh air outlet 24 of the room, and is sucked in by the suction port 222 of the fan coil unit 22 to be boosted and discharged. Return to the lower part of the room to promote the dirty air in the room to flow to the return air outlet 231 of the room return air duct 23 .

The fresh air system provided by the present embodiment uses secondary negative pressure to send fresh air into the room. The most essential feature is that the air return port 231 (that is, the room return air port 231) of the room return air duct 23 generates a negative pressure in the room, and the fan coil unit The suction port 222 of 22 generates a secondary negative pressure on the basis of the primary negative pressure generated by the return air port 231 of the room. The superposition of these two negative pressures makes the suction port 222 of the fan coil unit 22 in the lowest pressure area in the room. A large pressure difference is formed between the fresh air outlet 24 of the room and the suction outlet 222 of the fan coil unit 22, which pulls the fresh air into the room quickly, as shown in FIG. 8 .

In Figure 8, the arrow line running from left to right is the direction of airflow in the upper part of the room, and the arrow line going from right to left is the direction of airflow in the lower part of the room; the solid line sloping downward from left to right above the corresponding horizontal axis is The pressure distribution of the airflow in the upper part of the internal circulation room, the solid line sloping down from right to left below the corresponding horizontal axis is the pressure distribution of the airflow in the lower part of the internal circulation room; the dotted line above the corresponding horizontal axis sloping down from left to right is the pressure distribution of the airflow in the upper part of the room replaced by fresh air, and the dotted line sloping downward from right to left below the corresponding horizontal axis is the pressure distribution of the airflow in the lower part of the room replaced by fresh air.

Obviously, when the fresh air is replaced, the air suction port 222 of the fan coil unit 22 generates a secondary negative pressure on the basis of the primary negative pressure generated by the return air port 231 of the room. In the lowest pressure area of the room, a large pressure difference is formed between the fresh air outlet 24 of the adjacent room and the air suction port 222 of the fan coil unit 22, which pulls the fresh air into the room quickly.

Example 2

Both the present embodiment and the first embodiment expand the function of the fan coil unit 22 in the room. It is not only used as the power for the internal circulation of the room air conditioner, but also as the relay power for the replacement of the fresh air in the room. "; this embodiment does not set the rigid fresh air connecting pipe between the air supply space such as the living room aisle and the air suction port 222 of the fan coil unit 22 in the room, and maintains the degree of freedom of the space setting of the fan coil unit 22 in the room; the fresh air outlet 24 of the room in this embodiment can be set The damper 21, when the damper 21 is opened, implements internal circulation and fresh air replacement "one machine dual-purpose", when the damper 21 is closed, only internal circulation is implemented; this embodiment requires the establishment of a fresh air outlet 24 and a fan coil unit 22 suction outlet in the control room 222. The appropriate space relative relationship between the room return air outlet 231, that is, the room fresh air outlet 24 is required to be set close to the fan coil unit 22 suction outlet 222, and the room fresh air outlet 24 is set far from the room return air outlet 231, that is, the room new air outlet The distance between the air outlet 24 and the air suction outlet 222 of the fan coil unit 22 is smaller than the distance between the room fresh air outlet 24 and the return air outlet 231 of the room return duct 23 .

The difference of this embodiment is that the room fan coil unit 22 ′ is not the end of the household central air conditioner unit, but a split type room air conditioner indoor unit, and the room fan coil unit 22 ′ is installed on the inner wall of the room 1 . In this embodiment, the indoor unit of the split-type room air conditioner may be connected to the outdoor unit of the central air conditioner, or may be connected to the outdoor unit of the split-type room air conditioner. In this embodiment, as long as it is a fan coil unit 22', it can suck and exhaust air to promote indoor air circulation, so that when the return air outlet 231 of the room return duct 23 located far away sucks dirty air in the room and replaces the room with fresh air The fan coil unit 22 suction port 222 generates a lower secondary negative pressure, thereby establishing a pressure difference inside and outside the room fresh air port 24 on the door of the room to drive the fresh air from the aisle to flow into the room, which is the relay power for the whole house fresh air replacement, that is, the room The active force of ventilation.

In this embodiment, the two-way fresh air system without an air supply pipe is extended to the scene where a split room air conditioner is used, and the application range of the two-way fresh air system without an air supply pipe is expanded, as shown in FIG. 9 .

Example 3

This embodiment provides a whole-house fresh air system, which is used in a group of rooms. The group of rooms can be a business office, a residence, or both. This embodiment does not specifically limit this. Please refer to FIG. 10 , the room group includes a plurality of rooms 1 and a public space 6 communicating with each room 1, wherein each room 1 includes the room described in Embodiment 1 or Embodiment 2 that uses secondary negative pressure to send fresh air into the room. The fresh air system 2, the room fresh air outlet 24 of each room 1 communicates with the public space 6; the whole house fresh air system includes:

The general air inlet is arranged on the outer wall of the public space 6 to realize the communication between the public space 6 and the outside air of the group of rooms, and the general air inlet is provided with a fresh air module 4;

The total air outlet is arranged on the outer wall of the group of rooms and communicates with the outside air of the group of rooms; the total air outlet is provided with a general exhaust module 5; There are no restrictions on the installation location, and it can be installed on the outer wall of a certain room 1, or on the outer wall of the public space 6, or on the outer wall of the kitchen or bathroom;

The main air exhaust pipe communicates with the general air exhaust outlet, and communicates with each room 1 through several room return air pipes 23 .

In this embodiment, the fresh air module 4 includes an air blower, and may also include a pretreatment module for fresh air filtration and cooling and dehumidification (heating and heating), for performing pretreatments such as dust removal, cooling and dehumidification (heating and heating) on the fresh air.

In this embodiment, the general exhaust module 5 includes an exhaust fan.

In this embodiment, the room fresh air system 2 can also be installed in the public space 6. Of course, the room fresh air system 2 may not be installed in the public space 6, and only fan coil units can be installed, which can be set according to specific usage requirements.

In this embodiment, when the fresh air in the whole house is replaced, the fresh air module 4, the room fan coil unit 22 and the total exhaust module 5 are started, the fresh air positive pressure push of the fresh air module 4, the relay delivery of the room fan coil unit 22 and the ventilation module 5 are activated. Negative pressure suction and discharge of dirty air at the same time, together form a "two-way flow" whole-house fresh air replacement; the whole room fresh air replacement process is divided into three sections:

1. Fresh air delivery section

The fresh air module 4 inhales the fresh air from the environment and performs pretreatments such as filtering, cooling and dehumidification (heating and heating), and sends the fresh air with temperature, humidity, and cleanliness up to the standard directly into the living room aisle in the suite as a public space, reaching the door of each room ;

2. Fresh air replacement section

The fan coil unit 22 The air suction port 222 is located in the lowest pressure area of the room, and a large pressure difference is formed between the fresh air port 24 of the adjacent room and the air suction port 222 of the fan coil unit 22. The coil 22 inhales and boosts the pressure and shoots toward the outer wall side of the room, and then flows back to the inner wall side where the door is located after being reflected by the outer wall, forcing the dirty air in the room to enter the room return air duct 23;

3. Dirty air discharge section

The dirty air entering the room return duct 23 quickly flows into the main exhaust duct, enters the exhaust module 5 and is boosted again by the exhaust fan, and finally is discharged to the outdoor atmosphere for diffusion.

Example 4

This embodiment is partially adjusted on the basis of embodiment 3. The difference between this embodiment and embodiment 3 is that the general air inlet of the whole-house fresh air system is not set on the outer wall of the public space, but on the The specific structure of the outer wall of a certain room is as follows.

Please refer to FIG. 11 , a whole-house fresh air system is used for room groups, and the room group includes a plurality of rooms and a public space 6 communicating with each room; the whole-house fresh air system includes:

The main air inlet is arranged on the outer wall of a room, and in this embodiment, the room where the main air inlet is located is called a fresh air room 1'. The general air inlet communicates with the outside air of the group of rooms, and the general air inlet is provided with a fresh air module 4; the inner wall of the fresh air room 1' is provided with an air vent communicated with the public space 6; other rooms Including the fresh air system 2 described in embodiment 1 or embodiment 2, which uses secondary negative pressure to send fresh air into the fresh air room. In this embodiment, other rooms equipped with room fresh air system 2 are called fresh air replacement rooms 1. These fresh air replacement rooms 1 The fresh air outlet of the room communicates with the public space 6;

The total air outlet is arranged on the outer wall of the group of rooms and communicates with the outside air of the group of rooms; the total air outlet is provided with a general exhaust module 5; There are no restrictions on the setting location, it can be set on the outer wall of a certain room, or on the outer wall of the public space 6, or on the outer wall of the kitchen or bathroom;

The main air exhaust pipe communicates with the main air exhaust outlet, and communicates with the fresh air replacement room 1 through several room return air pipes 23 respectively.

Example 5

Please refer to FIG. 12 , a whole-house fresh air system is used for room groups, and the room group includes a plurality of rooms 1 and a public space 6 communicating with each room; the whole-house fresh air system includes:

The total air inlet is arranged on the outer wall of a room and communicates with the outside air of the group of rooms. The total air inlet is provided with a fresh air module; the total air inlet is provided with a total air supply pipe 7. The main air supply pipe 7 passes through this room and communicates with the public space 6 . In this embodiment, the room where the main air inlet is located and other rooms where the main air inlet is not located are all equipped with the fresh air system 2 described in embodiment 1 or embodiment 2 that uses secondary negative pressure to send fresh air into the fresh air room;

Claims

A fresh air system for sending fresh air into a fresh air room using secondary negative pressure, characterized in that it includes:

The fresh air outlet of the room is set on the enclosure structure of the room, and is used to pass the fresh air outside the room into the room;

The room return air duct is used to discharge the dirty air in the room to the outside of the room;

The fan coil unit is arranged in the room, and it includes a housing, and the housing is provided with an air outlet and an air suction port, and the distance between the room fresh air port and the air suction port is smaller than the distance between the room fresh air port and the air suction port. The distance between the return air outlets of the room return air pipe; the housing is provided with a fan, and under the action of the fan, the fresh air entering the room from the new air outlet of the room and the air in the room can be drawn from the air suction port. Enter the fan coil unit, and then discharge from the air outlet at a high speed to promote the air flow in the room and replace it with fresh air. The dirty air in the room is drawn out from the return air outlet of the room return air duct and then discharged out of the room.
A fresh air system for sending fresh air into a room using secondary negative pressure according to claim 1, wherein the room fresh air outlet is set on the wall of the room, on the head of the door of the room or on the door of the room Turn the door on.
As claimed in claim 1, a fresh air system that utilizes secondary negative pressure to send fresh air into a room is characterized in that a damper is provided on the fresh air outlet of the room, and when the damper is closed, under the action of the fan, The air in the room enters the fan coil unit from the air suction port, is discharged through the air outlet, and then enters the air suction port to realize internal air circulation in the room;

When the air door is opened, under the action of the fan, the fresh air outside the room enters the room from the fresh air outlet of the room, enters the fan coil from the air suction port, and is discharged into the room through the air outlet. , the fresh air drives the dirty air in the room to enter the room return air duct from the air return port of the room return air duct, and then be discharged to the outside of the room to complete the fresh air replacement.
A fresh air system for sending fresh air into a fresh air room by secondary negative pressure as claimed in claim 1, wherein the fan coil unit is an indoor unit of a split air conditioner, such as a wall-mounted unit, a cabinet unit, or a concealed fan coil unit. Or a surface-mounted fan coil unit; the indoor unit is connected to the outdoor unit of the split air conditioner to form a refrigerant circulation loop.
A fresh air system for sending fresh air into a fresh air room using secondary negative pressure as claimed in claim 5, wherein the fan coil unit is a fan coil unit installed on the ceiling at the end of a central air-conditioning water machine in the room or a central air-conditioning unit. The indoor unit at the end of the unit;

The fan coil unit is connected to the outdoor unit of the central air-conditioning water machine to form a cold and hot water circulation circuit, or connected to the outdoor unit of the central air-conditioning fluorine machine to form a refrigerant circulation circuit.
The fresh air system for sending fresh air into a room by secondary negative pressure according to claim 1, wherein the air suction port of the fan coil unit is set close to the fresh air port of the room, and the return air port of the room return air duct is Set away from the fresh air outlet in the room.
A whole-house fresh air system, which is characterized in that it is used in a group of rooms, and the group of rooms includes a plurality of rooms and a public space communicating with each room, wherein each room includes the air conditioner described in any one of claims 1 to 6. Room fresh air system, the room fresh air outlets of each room communicate with the public space; the whole house fresh air system includes:

The general air inlet is arranged on the outer wall of the public space to realize the communication between the public space and the outside air of the group of rooms, and the general air inlet is provided with a fresh air module;

The main air exhaust port is arranged on the outer wall of the room group and communicates with the outside air of the room group; the general air exhaust port is provided with a general air exhaust module;

The main air exhaust pipe communicates with the general air exhaust outlet, and communicates with each room through several room air return pipes.
A whole-house fresh air system, characterized in that it is used in a group of rooms, and the room group includes a plurality of rooms and a public space communicating with each room; the whole-house fresh air system includes:

The general air inlet is arranged on the outer wall of a room, and communicates with the outside air of the room group, and the fresh air module is arranged on the said general air inlet; the ventilation module connected with the public space is provided on the inner wall of this room. mouth; other rooms include the room fresh air system as claimed in any one of claims 1 to 6, and the room fresh air outlets of other rooms communicate with the public space;

The main air exhaust port is arranged on the outer wall of the room group and communicates with the outside air of the room group; the general air exhaust port is provided with a general air exhaust module;

The main air exhaust pipe communicates with the general air exhaust outlet, and communicates with each room through several room air return pipes.
A whole-house fresh air system, which is characterized in that it is used in a group of rooms, and the group of rooms includes a plurality of rooms and a public space communicating with each room, wherein each room includes the air conditioner described in any one of claims 1 to 6. Room fresh air system, the room fresh air outlets of each room communicate with the public space; the whole house fresh air system includes:

The general air inlet is set on the outer wall of a room, and communicates with the outside air of the room group. The general air inlet is provided with a fresh air module; the general air inlet is provided with a general air supply pipe. The air supply pipe passes through this room and communicates with the public space;

The main air exhaust port is arranged on the outer wall of the room group and communicates with the outside air of the room group; the general air exhaust port is provided with a general air exhaust module;

The main air exhaust pipe communicates with the general air exhaust outlet, and communicates with each room through several room air return pipes.