TW202421973A - Indoor one-to-many air purification system - Google Patents

Abstract

An indoor one-to-many air purification system which can be installed inside a building is provided. The system includes: an external air intake pipe, a plurality of internal circulation air pipe combinations, a ventilation module, a plurality of control modules, and a plurality of monitoring units. When any one of the control modules controls to open an intake switch and an exhaust switch in an independent space where it is located, the ventilation module is turned on and operated from a closed state. When all the control modules close the intake switch and the exhaust switch in the independent space, the ventilation module is closed for operation. When any monitoring unit detects that the content of a target inclusion exceeds a threshold value, the ventilation module opens the communication with the external air intake pipe. When all monitoring units detect that the content of the target inclusion is lower than the threshold value, the ventilation module closes the communication with the external air intake pipe.

Description

Indoor one-to-many air purification system

The present invention relates to an air freshener system, in particular to an indoor one-to-many air freshener system.

In a closed room, the temperature is usually adjusted by an air conditioning system, such as an air conditioner. In the past, household air conditioners were usually stand-alone, that is, a single machine had an independent compressor, which could cool and circulate the air in a specific space. With the reduction of space and the improvement of compressor performance, it is now wasteful to use a single compressor for a smaller space. Therefore, split air conditioners have become popular. Multiple indoor units can share a compressor, which reduces the size limit during installation and saves costs.

Although traditional air conditioners or air conditioning systems can adjust the temperature so that people can move around in a suitable temperature, and even have a sterilizing effect, reducing harmful bacteria in the cold and warm air, they cannot change the composition of the air to keep the air circulating indoors fresh. For example, if there are more people moving around in a closed space, the concentration of carbon dioxide will increase, and a higher concentration of carbon dioxide can easily make people feel tired. If there is no ventilation window design indoors, in order to obtain fresh air from outdoors, there are now fresh air fans or total heat exchangers on the market that can be installed and used. Simply put, a fresh air fan is a multifunctional exhaust fan that can draw outdoor air into the room through a fresh air duct connected to the outside, and at the same time exhaust the polluted air indoors. The full heat exchanger exchanges heat between indoor and outdoor air based on the fresh air fan to maintain the indoor temperature.

The current fresh air fans are all single-unit suction and exhaust, and cannot be circulated to the outside by a central host like a split air conditioner. For the limited space of modern residences, this will lead to an increase in the space required to place the circulation host and fresh air ducts, making installation troublesome. Although the full heat exchanger has a many-to-one design, it is used in a unified operation, which is a waste for spaces without air circulation requirements.

Since the devices used for indoor and outdoor air exchange have the above inconveniences, a new type of air purification system is needed to solve these problems.

This paragraph extracts and compiles certain features of the invention. Other features will be disclosed in the following paragraphs. Its purpose is to cover various modifications and similar arrangements within the spirit and scope of the attached patent application.

In order to solve the above problems, the present invention discloses an indoor one-to-many air freshener system. The system can be installed in a building, comprising: an external air intake pipe having a first end and a second end, the first end facing the external space of the building; a plurality of sets of internal circulation air pipe assemblies, each pair of internal circulation air pipe assemblies comprising: an air intake internal circulation air pipe having a third end and a fourth end, the third end facing one of several independent spaces inside the building, an air intake switch is provided to open or close the connection with the aforementioned independent space; and an exhaust internal circulation air pipe having a fifth end and a sixth end, the fifth end facing the aforementioned independent space, an exhaust switch is provided to open or close the connection with the aforementioned independent space; a ventilation module is sealably connected to the second end and connected to the fourth ends and the sixth ends, and is controlled to open or close the connection with the aforementioned independent space. When opened, the ventilation module guides the air in the external space to enter the ventilation module through the second end that is opened, and guides the air flow from the third end that is opened to the corresponding independent space and returns to the ventilation module from the fifth end that is opened of the corresponding exhaust internal circulation air pipe; a plurality of control modules, each control module is installed in an independent space In the independent space, the control module is connected to the ventilation module by signal, and is operated to synchronously open or close the air inlet switch and the air exhaust switch in the independent space where the control module is located, and the operation result is notified to the ventilation module; and a plurality of monitoring units, each of which is installed in an independent space, is connected to the ventilation module by signal, and monitors the content of a target substance in the independent space. When any control module controls to open the air intake switch and the air exhaust switch in the independent space, the ventilation module is turned on from the closed state; when all control modules close the air intake switch and the air exhaust switch in the independent space, the ventilation module is turned off; when any monitoring unit detects that the content of the target substance exceeds a threshold value, the ventilation module opens the connection with the second end; when all monitoring units detect that the content of the target substance is lower than the threshold value, the ventilation module closes the connection with the second end.

The present invention also discloses another indoor one-to-many air freshener system. The system is also installed in a building, and includes: an external air intake pipe, having a first end and a second end, the first end facing the external space of the building; a plurality of sets of internal circulation air pipe assemblies, each pair of internal circulation air pipe assemblies including: an air intake internal circulation air pipe, having a third end and a fourth end, the third end facing one of the several independent spaces inside the building, an air intake switch is provided to open or close the connection with the aforementioned independent space; and an exhaust internal circulation air pipe, having a fifth end and a sixth end, the fifth end facing the aforementioned independent space, an exhaust switch is provided to open or close the connection with the aforementioned independent space; a ventilation module, which is sealably connected to the second end and connected to the fourth ends and the sixth ends, and is controlled to open or close the connection with the aforementioned independent space. Open or closed, wherein, when opened, the ventilation module guides the air of the external space into the ventilation module through the second end that is opened and connected, and guides the airflow from the third end that is opened and connected to the corresponding independent space and returns to the ventilation module from the fifth end that is opened and connected of the corresponding exhaust internal circulation air pipe; a plurality of control modules, each control module is installed in an independent space, is signal-connected to the ventilation module, is operated to synchronously open or close the air intake switch and the exhaust switch in the independent space where the control module is located, and notifies the ventilation module of the operation result; and a monitoring unit, which is installed inside the ventilation module and is signal-connected to the ventilation module, monitors the content of a target content substance in the internal space of the ventilation module. When any control module controls to open the air intake switch and the air exhaust switch in the independent space, the ventilation module is turned on from a closed state; when all control modules close the air intake switch and the air exhaust switch in the independent space, the ventilation module is turned off; when the monitoring unit detects that the content of the target substance exceeds a threshold value, the ventilation module opens the connection with the second end; when the monitoring unit detects that the content of the target substance is lower than the threshold value, the ventilation module closes the connection with the second end.

According to the present invention, the ventilation module may further include: a shell, with a plurality of through holes, each of which is connected to the second end in a sealable manner, or connected to one of the fourth ends or one of the sixth ends; a fan installed in the shell and started to generate airflow; a ventilation valve, which is sealedly connected to the second end through corresponding through holes and is controlled to open or close the connection between the ventilation module and the second end; and a control circuit, which is connected to the control modules and the monitoring units by signal, is controlled by the control modules to start or close the fan, and opens or closes the ventilation valve according to the monitoring results of the monitoring units. The ventilation module may further include: a shell, with a plurality of through holes, each of which is connected to the second end in a sealable manner, or connected to one of the fourth ends or one of the sixth ends; a fan installed in the shell and started to generate airflow; a ventilation valve, which is sealedly connected to the second end through corresponding through holes and is controlled to open or close the connection between the ventilation module and the second end; and a control circuit, which is connected to the control modules and the monitoring unit signals, is controlled by the control modules to start or close the fan, and opens or closes the ventilation valve according to the monitoring results of the monitoring unit.

According to the present invention, the control module may further include: a switch unit, which is operated by touch, sound or light to synchronously open or close the air intake switch and the exhaust switch in the independent space where the control module is located, and sends an opening signal or a closing signal; a signal connection unit, which is signal-connected to the ventilation module; and a control unit, which is signal-connected to the switch unit and the signal connection unit, converts the opening signal and the closing signal into corresponding electrical signals or electromagnetic wave signals, and transmits them to the ventilation module through the signal connection unit. When the ventilation module receives the opening signal sent by any control module, the ventilation module is turned on from the closed state; when the ventilation module receives the closing signal sent by all control modules, the ventilation module is closed.

Preferably, the switch unit is a manual switch, a touch panel, a voice-activated switch or a light-activated switch.

The control module and the ventilation module can be connected by wireless signals, and the connection method complies with Wi-Fi, Zigbee or Bluetooth specifications. The control module and the ventilation module can also be connected by wired signals, and the connection method complies with RS-485 or RS-232 specifications.

Preferably, the target substance is carbon monoxide, carbon dioxide, formaldehyde or PM2.5 suspended matter.

According to the present invention, the ventilation module may further include at least one air filter unit for blocking suspended particles in the air flowing through the ventilation module. The ventilation module may also further include at least one sterilization unit for killing bacteria and viruses in the air flowing through the ventilation module.

The indoor one-to-many air freshening system further comprises a power module electrically connected to an external power source and the control circuit, converting the power of the external power source into a working direct current, which is provided to the ventilation module, the control module and the monitoring unit.

Through the above design, the present invention has the following advantages. First, it breaks through the limitation that the current fresh air fans are all single-machine suction and exhaust, and a single ventilation module can circulate air for multiple independent spaces, reducing the trouble of laying out pipelines or moving the whole machine. Second, the control module allows users in each independent space to turn on the fan according to their own needs. In addition to eliminating the restrictions on the use of a unified controller, the ventilation module can be turned off when all independent spaces do not need air circulation, which has the benefit of saving electricity costs. Third, the operation of reducing the content of target substances in the air introduced into the external space is automatically performed, which can always keep the indoor air fresh.

In order to make the description of the disclosed content more detailed and complete, the following provides an illustrative description of the implementation mode and specific embodiments of the present invention.

Please see Figure 1, which is a component architecture diagram of an indoor one-to-many air purification system (hereinafter referred to as the system) according to the present invention. The system is installed in a building C, such as an apartment, factory, office building, activity center, etc. Several independent spaces are separated in the building C. An independent space is an area separated by partitions or fixed objects and is not directly connected to other independent spaces, such as a room, an office, or an activity space temporarily separated by a curtain. In this embodiment, the building C includes two independent spaces, a first independent space S1 and a second independent space S2, and the separation therebetween is shown by a thick black line. It should be noted that the system can be applied to more than two independent spaces, and the use of two independent spaces in Figure 1 is only an example and is not intended to limit the present invention.

The system includes an external air intake pipe 11, a plurality of internal circulation air pipe assemblies 12, a ventilation module 13, a plurality of control modules 14, a plurality of monitoring units 15 and an electric module 16. The external air intake pipe 11 is a pipe used by the system to obtain fresh air from the external space of the building C, and can be installed along the ceiling of the building C, extending from indoors to outdoors. The external air intake pipe 11 has a first end 111 and a second end 112. The first end 111 faces the external space of the building C, and the second end 112 is connected to the ventilation module 13 in a sealed manner (i.e., the connection and sealing states can be selectively switched).

In this embodiment, there are two independent spaces, and each independent space is connected to a set of internal circulation air pipe assemblies 12, so there are two internal circulation air pipe assemblies 12. The number of internal circulation air pipe assemblies 12 is the same as the number of independent spaces, and at least two sets are also provided. The actual number used is not limited by this embodiment. The internal circulation air pipe assembly 12 is used to connect the ventilation module 13 with the air flow between each independent space, and includes an air intake internal circulation air pipe 121 and an air exhaust internal circulation air pipe 122. The function of the air intake internal circulation air pipe 121 is to introduce the air in the ventilation module 13 into the independent space, and has a third end 1211 and a fourth end 1212. The third end 1211 faces one of the two independent spaces inside the building C, such as the first independent space S1, and is provided with an air intake switch 1211a to open or close the connection with the aforementioned independent space. The exhaust internal circulation air pipe 122 is used to suck the air in the independent space back to the ventilation module 13, and has a fifth end 1221 and a sixth end 1222. The fifth end 1221 faces the aforementioned independent space, and is provided with an exhaust switch 1221a to open or close the connection with the aforementioned independent space.

The ventilation module 13 is a technical element of the system for guiding airflow and circulating and refreshing each independent space. In terms of form, the ventilation module 13 can be connected to the second end 112 in a closed manner, and is connected to the two fourth ends 1212 and the two sixth ends 1222. The ventilation module 13 can be controlled to be opened or closed. In terms of overall function, when the ventilation module 13 is turned on, the ventilation module 13 guides the air in the external space to enter the ventilation module 13 through the opened and connected second end 112. It should be noted that the second end 112 does not necessarily maintain an open and connected state to the outside. If the second end 112 is closed, the ventilation module 13 can still operate to guide the airflow, but the airflow circulation in this state can only be between the ventilation module 13 and the independent space. That is, the ventilation module 13 guides the airflow from the opened third end 1211 to the corresponding independent space, and returns to the ventilation module 13 from the opened fifth end 1221 of the corresponding exhaust internal circulation air pipe 122. If all the third ends 1211 and the fifth ends 1221 are closed, the ventilation module 13 cannot circulate air to the independent space and will be closed.

In further detail, the ventilation module 13 includes a housing 131, a fan 132, a ventilation valve 133 and a control circuit 134. The housing 131 is used to separate the independent space so that the airflow can flow along the predetermined boundary therein when the fan 132 is running, and the air circulation effect will not be poor due to air leakage. The housing 131 is provided with a plurality of through holes, and the through holes are located at the junction of the second end 112, the fourth end 1212 and the sixth end 1222. The through holes are in close contact with the outer periphery of the second end 112, the fourth end 1212 and the sixth end 1222, so that each through hole can be connected to the second end 112 in a sealed manner, or connected to one of the fourth ends 1212 or one of the sixth ends 1222. In this embodiment, as can be seen from FIG. 1 , there are a total of 5 through holes. The fan 132 is installed in the housing 131 and started to generate airflow. According to the present invention, the fan 132 can be, but is not limited to, an axial flow fan, a centrifugal fan, a diagonal flow fan or a cross flow fan. The ventilation valve 133 is tightly connected to the second end 112 through the corresponding through hole. The ventilation valve 133 is controlled to open or close the connection between the ventilation module 13 and the second end 112. The control circuit 134 is signal-connected to two control modules 14 and two monitoring units 15. The control circuit 134 (ventilation module 13) is signal-connected to the control module 14 and the monitoring unit 15 by wired signal connection. In practice, the connection method may comply with RS-485 or RS-232 specifications. In the diagram, the dotted line represents the power line and signal line connecting the two ends of the object. The control circuit 134 is controlled by the two control modules 14 to start or shut down the fan 132, and can open or close the ventilation valve 133 according to the monitoring result of the monitoring unit 15. In other embodiments, the control circuit 134 (ventilation module 13) can also be connected to the control module 14 and the monitoring unit 15 by wireless signal communication, and the connection method complies with Wi-Fi, Zigbee or Bluetooth specifications. That is to say, the control circuit 134, the control module 14 and the monitoring unit 15 all have the aforementioned RF modules, and communicate by transmitting signals using electromagnetic waves. At this time, the dotted line represents the power line connecting the two ends of the objects.

In addition to introducing air from the outside space into the room to reduce the content of target substances in the room, the ventilation module 13 can also provide auxiliary functions of dust removal and sterilization. As shown in FIG. 1 , the ventilation module 13 may include at least one air filter unit 135 for blocking suspended particles in the air flowing through the ventilation module 13 . The air filter unit 135 may be, but is not limited to, a high-efficiency particulate air (HEPA) filter, electrostatic cotton, a primary filter iron mesh, or a composite filter. In addition, the ventilation module 13 may further include at least one sterilization unit 136 for killing bacteria and viruses in the air flowing through the ventilation module. The sterilization unit 136 may be an ultraviolet sterilization lamp or a high voltage electrode grid.

In this embodiment, two control modules are used as an example to illustrate that each control module 14 is installed in each independent space connected to the internal circulation air pipe assembly 12, such as on the wall of the first independent space S1. The control module 14 is connected to the control circuit 134 of the ventilation module 132 by signal, providing the user with an operation to synchronously open or close the air intake switch 1211a and the exhaust switch 1221a in the independent space where the control module 14 is located, and notifying the ventilation module 13 (control circuit 134) of the operation result. For the detailed structure of the control module 14, please see Figure 2, which is a component block diagram of the control module 14 and the connected objects. The control module 14 includes a switch unit 141, a signal connection unit 142 and a control unit 143. The switch unit 141 can be operated by touch, sound or light to synchronously open or close the air intake switch 1211a and the exhaust switch 1221a in the independent space where the control module 14 is located, and send out an opening signal or a closing signal. In other words, the switch unit 141 can be a manual switch, a touch panel, a voice-controlled switch or a light-controlled switch. In this embodiment, the switch unit 141 is a touch panel, and a message guiding the user to open or close the air intake switch 1211a and the exhaust switch 1221a is displayed on the panel. The signal connection unit 142 is connected to the control circuit 143 of the ventilation module 13 by signal, and can be an RS-485 connector or a Bluetooth module in practice. The control unit 143 is signal-connected to the switch unit 141 and the signal connection unit 143, and in practice includes an electronic component of a controller, which can convert the aforementioned opening signal and closing signal into corresponding electrical signals or electromagnetic wave signals, and transmit them to the ventilation module 13 through the signal connection unit 142. When the ventilation module 13 receives the opening signal sent by any control module 14, the ventilation module 13 (fan 132) is turned on and operated from the closed state; when the ventilation module 13 receives the closing signal sent by all control modules 14, the ventilation module 13 is closed and operated. That is, when any control module 14 controls to open the air intake switch 1211a and the exhaust switch 1221a in the independent space, the ventilation module 13 is turned on from the closed state; when all control modules 14 close the air intake switch 1211a and the exhaust switch 1221a in the independent space, the ventilation module 13 is closed.

In this embodiment, two monitoring units 15 are used as an example for explanation. Each monitoring unit 15 is installed in an independent space, such as on the ceiling of the second independent space S2, and is connected to the signal of the ventilation module 13. The function of the monitoring unit 15 is to monitor the content of a target substance in the independent space, so as to introduce fresh air from the external space into the independent space to reduce the content of the target substance in the independent space. The method is as follows: when any monitoring unit 15 detects that the content of the target substance exceeds a threshold value, the ventilation module 13 opens the connection with the second end 112, that is, opens the ventilation valve 133; when all monitoring units 15 detect that the content of the target substance is lower than the threshold value, the ventilation module 13 closes the connection with the second end 112, that is, closes the ventilation valve 133. When the ventilation valve 133 is opened and the fan 132 is running at the same time, the air in the external space will be sucked into the ventilation module 13 to reduce the content of the target substance contained in the circulating air. When the ventilation valve 133 is closed and the fan 132 is still running, the ventilation module 13 continues to circulate air for each independent space, but the air in the external space cannot enter the ventilation module 13 to reduce the content of the target internal substance. According to the present invention, the system does not need to set an external exhaust pipe for exhausting the external space, because the air sucked into the building C will squeeze the original air to the outside after reaching the independent space. Since each independent space or even the building C is not completely sealed, the excess air will slowly flow to the external space along its gaps to maintain the pressure balance in the building C.

In addition, according to the present invention, the target content can be carbon monoxide, carbon dioxide, formaldehyde or PM2.5 suspended matter, and the monitoring unit 15 can be a carbon monoxide detector, a carbon dioxide detector, a formaldehyde detector or a PM2.5 suspended matter detector. Take carbon dioxide as an example of the target content. When the content of carbon dioxide in the room is too high, people will feel dizzy and want to sleep. The user can set the threshold value of carbon dioxide, such as 400PPM. When the carbon dioxide content in the independent space is 600 PPM, the ventilation valve 133 is controlled by the control circuit 134 to open the ventilation valve 133 to introduce external air with a lower carbon dioxide content into the independent space of the building C for circulation until the carbon dioxide content in all independent spaces is lower than 400 PPM.

The power module 16 is electrically connected to an external power source (such as a power grid socket, not shown) and the control circuit 134, and converts the power of the external power source into a working direct current, which is provided to the ventilation module 13, the control modules 14 and the monitoring units 15. In practice, considering the convenience of local use, the power of the control module 14 and the monitoring unit 15 may not use the working direct current of the power module 16, but adopt appropriate power from a nearby power source.

Please see Figure 3, which is a component architecture diagram of another embodiment of an indoor one-to-many air freshener system according to the present invention. Most of the components and technical features are the same as those of the embodiment disclosed in Figure 1, so the components with the same symbols in Figure 3 and Figure 1 are the same, and their types, functions and operating methods are not repeated. In this embodiment, the only difference from the previous embodiment is the monitoring unit 15'. The type and function of the monitoring unit 15' are the same as those of the monitoring unit 15, but the number of the monitoring unit 15' is only one, and its installation position is inside the ventilation module 13 (inside the housing 131), rather than in an independent space. The monitoring unit 15' is connected to the control circuit 134 of the ventilation module 13 by signal, and can monitor the content of the target content in the internal space of the ventilation module 13. The definition of the target content is the same as described above. The internal space is the place where the air flows when the ventilation module 13 is in operation. Monitoring the content of the target content therein is to synchronously monitor the content of the target content in all independent spaces. Similarly, when the monitoring unit 15' detects that the content of the target content exceeds a threshold value, the ventilation module 13 opens the connection with the second end 112, guides the air in the external space to enter all independent spaces for circulation, and dilutes the content of the target content. When the monitoring unit 15' detects that the content of the target content is lower than the threshold value, the ventilation module 13 closes the connection with the second end 112. The control circuit 134 can open or close the ventilation valve 133 according to the monitoring result of the monitoring unit 15'. The advantage of this embodiment is that the installation and installation cost of the monitoring unit can be saved.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be defined by the scope of the attached patent application.

11: External air intake pipe 111: First end 112: Second end 12: Internal circulation air pipe assembly 121: Intake internal circulation air pipe 1211: Third end 1211a: Intake switch 1212: Fourth end 122: Exhaust internal circulation air pipe 1221: Fifth end 1221a: Exhaust switch 1222: Sixth end 13: Ventilation module 131: Housing 132: Fan 133: Ventilation valve 134: Control circuit 135: Air filter unit 136: Sterilization unit 14: Control module 141: Switch unit 142: Signal connection unit 143: Control unit 15: Monitoring unit 15’: Monitoring unit 16: Power module C: Building S1: First independent space S2: Second independent space

FIG. 1 is a component structure diagram of an indoor one-to-many air freshener system according to the present invention.

FIG. 2 is a block diagram of components of a control module and connected objects.

FIG. 3 is a component structure diagram of another indoor one-to-many air freshener system according to the present invention.

11: External air intake pipe

111: First end

112: Second end

12: Internal circulation air tube assembly

121: Intake internal circulation air pipe

1211: The third end

1211a: Air intake switch

1212: The fourth end

122: Exhaust internal circulation air pipe

1221: The fifth end

1221a: Exhaust switch

1222: The sixth end

13: Ventilation module

131: Shell

132: Fan

133:Ventilation valve

134: Control circuit

135: Air filter unit

136: Sterilization unit

14: Control module

15: Monitoring unit

16: Power module

C: Buildings

S1: The first independent space

S2: Second independent space

Claims (12)

An indoor one-to-many air freshening system is installed in a building, comprising: an external air intake pipe having a first end and a second end, the first end facing the external space of the building; a plurality of sets of internal circulation air pipe assemblies, each pair of internal circulation air pipe assemblies comprising: an air intake internal circulation air pipe having a third end and a fourth end, the third end facing one of several independent spaces inside the building, an air intake switch is provided to open or close the connection with the aforementioned independent space; and an air exhaust internal circulation air pipe having a fifth end and a sixth end, the fifth end facing the aforementioned independent space, an air exhaust switch is provided to open or close the connection with the aforementioned independent space; A ventilation module, which is sealably connected to the second end, and is connected to the fourth ends and the sixth ends, and is controlled to be opened or closed, wherein, when opened, the ventilation module guides the air in the external space to enter the ventilation module through the opened second end, and guides the air flow from the opened third end to the corresponding independent space and returns to the ventilation module from the opened fifth end of the corresponding exhaust internal circulation air pipe; A plurality of control modules, each of which is installed in an independent space, is signal-connected to the ventilation module, and is operated to synchronously open or close the air intake switch and the exhaust switch in the independent space where the control module is located, and notifies the ventilation module of the operation result; and Multiple monitoring units, each of which is installed in an independent space and connected to the ventilation module signal to monitor the content of a target substance in the independent space. Among them, when any control module controls to open the air intake switch and the air exhaust switch in the independent space, the ventilation module is turned on from the closed state; when all control modules close the air intake switch and the air exhaust switch in the independent space, the ventilation module is turned off; when any monitoring unit detects that the content of the target substance exceeds a threshold value, the ventilation module opens the connection with the second end; when all monitoring units detect that the content of the target substance is lower than the threshold value, the ventilation module closes the connection with the second end. An indoor one-to-many air freshening system is installed in a building, comprising: an external air intake pipe having a first end and a second end, the first end facing the external space of the building; a plurality of sets of internal circulation air pipe assemblies, each pair of internal circulation air pipe assemblies comprising: an air intake internal circulation air pipe having a third end and a fourth end, the third end facing one of several independent spaces inside the building, an air intake switch is provided to open or close the connection with the aforementioned independent space; and an air exhaust internal circulation air pipe having a fifth end and a sixth end, the fifth end facing the aforementioned independent space, an air exhaust switch is provided to open or close the connection with the aforementioned independent space; A ventilation module, which is sealably connected to the second end, and is connected to the fourth ends and the sixth ends, and is controlled to be opened or closed, wherein, when opened, the ventilation module guides the air in the external space to enter the ventilation module through the opened second end, and guides the air flow from the opened third end to the corresponding independent space and returns to the ventilation module from the opened fifth end of the corresponding exhaust internal circulation air pipe; A plurality of control modules, each of which is installed in an independent space, is signal-connected to the ventilation module, and is operated to synchronously open or close the air intake switch and the exhaust switch in the independent space where the control module is located, and notifies the ventilation module of the operation result; and A monitoring unit is installed inside the ventilation module and is connected to the ventilation module signal to monitor the content of a target substance in the internal space of the ventilation module. Wherein, when any control module controls to open the air intake switch and the exhaust switch in the independent space, the ventilation module is turned on from the closed state; when all control modules close the air intake switch and the exhaust switch in the independent space, the ventilation module is closed; when the monitoring unit detects that the content of the target substance exceeds a threshold value, the ventilation module opens the connection with the second end; when the monitoring unit detects that the content of the target substance is lower than the threshold value, the ventilation module closes the connection with the second end. The indoor one-to-many air freshening system as described in claim 1, wherein the ventilation module further comprises: a housing, with a plurality of through holes, each of which is connected to the second end in a sealable manner, or connected to one of the fourth ends or one of the sixth ends; a fan, installed in the housing, started to generate airflow; a ventilation valve, tightly connected to the second end through the corresponding through holes, controlled to open or close the connection between the ventilation module and the second end; and a control circuit, connected to the control modules and the monitoring unit signals, controlled by the control modules to start or close the fan, and open or close the ventilation valve according to the monitoring results of the monitoring units. The indoor one-to-many air freshening system as described in claim 2, wherein the ventilation module further comprises: a housing, with a plurality of through holes, each of which is connected to the second end in a sealable manner, or connected to one of the fourth ends or one of the sixth ends; a fan, installed in the housing, started to generate airflow; a ventilation valve, which is tightly connected to the second end through the corresponding through holes, and is controlled to open or close the connection between the ventilation module and the second end; and a control circuit, which is connected to the control modules and the monitoring unit signals, is controlled by the control modules to start or close the fan, and opens or closes the ventilation valve according to the monitoring results of the monitoring unit. An indoor one-to-many air freshening system as described in claim 1 or 2, wherein the control module further comprises: a switch unit, which is operated by touch, sound or light to synchronously open or close the air inlet switch and the air exhaust switch in the independent space where the control module is located, and sends out an opening signal or a closing signal; a signal connection unit, which is signal-connected to the ventilation module; and a control unit, which is signal-connected to the switch unit and the signal connection unit, converts the opening signal and the closing signal into corresponding electrical signals or electromagnetic wave signals, and transmits them to the ventilation module through the signal connection unit, When the ventilation module receives the opening signal from any control module, the ventilation module is turned on from the closed state; when the ventilation module receives the closing signal from all control modules, the ventilation module is closed. An indoor one-to-many air purification system as described in claim 5, wherein the switch unit is a manual switch, a touch panel, a voice-controlled switch or a light-controlled switch. An indoor one-to-many air purification system as described in claim 1 or 2, wherein the control module and the ventilation module are connected by wireless signals, and the connection method complies with Wi-Fi, Zigbee or Bluetooth specifications. An indoor one-to-many air purification system as described in claim 1 or 2, wherein the target substance is carbon monoxide, carbon dioxide, formaldehyde or PM2.5 suspended matter. An indoor one-to-many air purification system as described in claim 1 or 2, wherein the ventilation module further includes at least one air filter unit for blocking suspended particles in the air flowing through the ventilation module. An indoor one-to-many air freshening system as described in claim 1 or 2, wherein the ventilation module further comprises at least one sterilization unit for killing bacteria and viruses in the air flowing through the ventilation module. An indoor one-to-many air freshener system as described in claim 1 or 2, wherein the control module and the ventilation module are connected by wired signals, and the connection method complies with RS-485 or RS-232 standards. The indoor one-to-many air purification system as described in claim 1 or 2 further includes a power module electrically connected to an external power source and the control circuit, converting the power of the external power source into a working direct current, which is provided to the ventilation module, the control module and the monitoring unit.