CN111237865A

CN111237865A - Multi-connected air conditioning system

Info

Publication number: CN111237865A
Application number: CN202010143739.3A
Authority: CN
Inventors: 邓玉平; 李丛来; 庞猛
Original assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2020-03-04
Filing date: 2020-03-04
Publication date: 2020-06-05
Anticipated expiration: 2040-03-04
Also published as: CN111237865B

Abstract

The invention discloses a multi-connected air conditioning system, which comprises an indoor unit and an outdoor unit which are communicated through refrigerant pipes, and a fresh air introducing unit. The fresh air introducing unit comprises a shell, and a fresh air inlet and a fresh air outlet are arranged on the shell; one end of the first air pipe is communicated with the fresh air inlet, and the other end of the first air pipe is communicated with outdoor atmosphere; one end of the second air pipe is communicated with the fresh air outlet, and the other end of the second air pipe is communicated with the air return side of the indoor unit; the inside of casing is located to the filtering component, purifies the new trend of newly-introducing, improves the new trend quality. Through the intercommunication of new trend introduction unit and certain indoor unit, blow from the air outlet to indoor again after the new trend after will filtering mixes with indoor unit's return air, satisfy the new trend demand of sending of many online machines to be convenient for the dismouting, the energy consumption is low, with low costs.

Description

Multi-connected air conditioning system

Technical Field

The invention relates to the technical field of air conditioners, in particular to a multi-connected air conditioning system.

Background

With the improvement of the living quality requirements of people, the application of the multi-connected air conditioning system is more and more common.

The multiple air-conditioning system is called multiple air-conditioning system for short, also called refrigerant flow variable multiple air-conditioning system, and is formed from an outdoor machine connected with several direct evaporative indoor machines with different or identical type and capacity, and formed into a set of single refrigeration/heating circulation air-conditioning system, also called VRF or VRV for short.

The multi-connected air conditioning system can meet the requirements of refrigeration, heating, dehumidification and the like for each indoor space, and brings energy-saving requirements and comfortable experience to users.

At present, in a household multi-connected air conditioning system, if a user needs to introduce outdoor air, there are generally three ways.

First, the method is simple and easy to implement in a natural infiltration manner, but the introduced fresh air quantity and the quality of the fresh air are not controlled, so that the use comfort of the multi-split air conditioner is reduced.

Secondly, the requirement of fresh air can be realized by changing an indoor unit in the multi-split system into a fresh air fan, but the cost of the whole machine is higher, including the capacity of the outdoor unit is required to be increased, the cold and hot load is increased, and the energy consumption is increased;

thirdly, a single total heat exchanger is arranged indoors, the requirement of fresh air can be met, energy is saved, the use is comfortable, and space congestion can be caused by adding one machine in the house of a household.

Disclosure of Invention

In some embodiments of the present application, a multi-connected air conditioning system is provided, which includes a fresh air introducing unit, and the fresh air introducing unit can be detachably communicated with an indoor unit as an optional part, so as to meet the fresh air introducing requirement of the multi-connected air conditioning system, and is convenient to install and low in energy consumption.

In some embodiments of this application, improve the new trend induction element, be equipped with filtering component in the new trend induction element, filter the new trend.

In some embodiments of this application, improve the filter assembly in the unit is introduced to the new trend, press from both sides the filter assembly tightly between fixed end cover and new trend entry through the lag bolt, the filter assembly's of being convenient for dismantlement and installation.

In some embodiments of the present application, there is provided a multi-connected air conditioning system, including: an outdoor unit installed on a wall outdoors; an indoor unit installed in an indoor space; a refrigerant pipe guiding a flow of a refrigerant, the pipe communicating the outdoor unit with the indoor unit; fresh air introducing unit, including: the shell is provided with a fresh air inlet and a fresh air outlet; the first air pipe is used for communicating the fresh air inlet with outdoor atmosphere and guiding outdoor fresh air to enter the shell; the second air pipe is used for communicating the fresh air outlet with the air return side of the indoor unit and guiding the fresh air in the shell to enter the air return side of the indoor unit; and the filtering component is arranged inside the shell and used for purifying fresh air introduced into the shell.

In some embodiments of the present application, a reserved opening is formed in a side wall of an air return side of the indoor unit, and a blocking plate is detachably arranged at the reserved opening; a second flange is arranged on the side wall of the air return side of the indoor unit, which is opposite to the reserved opening; one end of the second air pipe is connected with the second flange.

In some embodiments of this application, filter assembly has PP filter layer, PM2.5 filter layer and active carbon filter layer, the new trend that first tuber pipe introduced passes through in proper order the PP filter layer PM2.5 filter layer and flow to behind the active carbon filter layer the second tuber pipe.

In some embodiments of this application, be equipped with the stand in the casing, the spiro union has the elasticity bolt on the stand, fixed end cover is connected to the one end of elasticity bolt, filtering component detachably clamp in fixed end cover with between the new trend entry.

In some embodiments of the present application, the fresh air introducing unit further includes: the humidifier humidifies the fresh air filtered by the filtering component in the shell.

In some embodiments of this application, the humidifier is connected with the oral siphon, the oral siphon passes through water route and indoor tap intercommunication.

In some embodiments of the present application, the fresh air introducing unit further includes: and the air valve is arranged at the fresh air outlet and provided with a plurality of opening degrees.

In some embodiments of the present application, the fresh air introducing device is opened to set the air valve to a minimum opening degree.

In some embodiments of the present application, the fresh air introducing unit further includes: the fresh air controller controls the starting and stopping of the humidifier and the opening of the air valve; and the fresh air controller is electrically connected with a master controller of the multi-connected air conditioning system.

In some embodiments of the present application, a maintenance plate is disposed on one side of the housing, and the maintenance plate is opened to expose the inner cavity of the housing.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a multi-connected air conditioning system according to an embodiment;

FIG. 2 is a top view of portions of an indoor unit and a fresh air introduction unit of a multi-connected air conditioning system according to an embodiment;

FIG. 3 is a front view of portions of an indoor unit and a fresh air introduction unit of a multi-connected air conditioning system according to an embodiment;

FIG. 4 is a side view of portions of an indoor unit and a fresh air introduction unit of a multi-connected air conditioning system according to an embodiment;

fig. 5 is an exploded view of a fresh air introduction unit according to an embodiment;

FIG. 6 is a schematic structural view of a fresh air introduction unit with a filter assembly and a maintenance plate omitted according to an embodiment;

fig. 7 is a schematic configuration diagram of an indoor unit according to an embodiment;

fig. 8 is an enlarged view of a portion a of fig. 7.

Reference numerals:

100-fresh air introducing unit, 110-first air pipe, 120-second air pipe, 130-shell, 131-fresh air inlet, 132-fresh air outlet, 133-concave part, 134-upright post, 135-fixed end cover, 136-elastic bolt, 137-maintenance plate, 138-fixed part, 139-hinge, 140-filtering component, 150-humidifier, 151-water inlet pipe, 160-fresh air controller, 170-first flange and 180-air valve;

200-indoor unit, 210-fan, 220-reserved port, 230-blocking plate, 231-connecting part, 240-gap and 250-second flange;

300-an outdoor unit;

1-compressor, 2-heat exchanger, 3-expansion valve, 4-master controller.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

< basic operation principle of air conditioner >

The multi-connected air conditioning system in the present application performs a refrigeration cycle of an air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.

The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.

< composition of indoor Unit and outdoor Unit >

Referring to fig. 1 and 2, a multi-connected air conditioning system according to some embodiments of the present application includes an indoor unit 200 installed in an indoor space. The indoor unit 200 is connected to the outdoor unit 300 installed in the outdoor space through a refrigerant pipe. The outdoor unit 300 may be provided therein with a compressor 1, an outdoor heat exchanger 2, an outdoor fan, an expander, and the like of a refrigeration cycle, and the indoor unit 200 may be provided therein with an indoor heat exchanger and an indoor fan 2.

For example, the indoor unit 200 may include a ceiling-mounted duct type air conditioner installed on a ceiling of an indoor space.

< composition of fresh air introducing Unit >

The fresh air introducing unit 100 is used for introducing outdoor fresh air to the air return side of the indoor unit 200, and the fresh air and the indoor return air are mixed and then blown into the room through the air outlet of the indoor unit 200, so that the indoor air quality is improved.

The fresh air introducing unit 100 is detachably connected with the indoor units 200, the fresh air introducing unit 100 can be selectively installed according to user requirements as an optional part, a certain indoor unit does not need to be modified into a fresh air machine or a full heat exchanger is additionally installed indoors in the prior art, and the fresh air introducing unit is high in applicability, low in cost, low in energy consumption and convenient to install and use.

[ case ]

Referring to fig. 6, the fresh air introducing unit 100 includes a housing 130, a fresh air inlet 131 and a fresh air outlet 132 are disposed on the housing 130, and the fresh air inlet 131 and the fresh air outlet 132 are both communicated with an inner cavity of the housing 130 to form a fresh air flow path.

The outer wall of the housing 130 is fixedly provided with a plurality of fixing portions 138, and the fixing portions 138 are fixedly connected with the house body or a support frame on the house body, so that the housing 130 is fixedly mounted.

For example, the fixing portions 138 are hooks for easy hanging, and the hooks are fixedly disposed on the left and right sides of the housing 130.

[ first air duct ]

The first air duct 110 connects the fresh air inlet 131 with the outdoor atmosphere, and guides the outdoor fresh air into the casing 130.

The casing 130 is fixedly provided with a first flange 170 on the side wall close to the fresh air inlet 131, the through hole of the first flange 170 is right opposite to the fresh air inlet 131, one end of the first air pipe 110 is communicated with the outdoor atmosphere, and the other end of the first air pipe is fixedly connected with the first flange 170, so that the first air pipe 110 is communicated with the fresh air inlet 131.

[ second air duct ]

The second air duct 120 communicates the fresh air outlet 132 with the return air side of the indoor unit 200, and guides the fresh air in the casing 130 to the return air side of the indoor unit 200.

The casing 130 is close to on the lateral wall of new trend export 132 fixed be equipped with first flange 170, the through-hole of first flange 170 just right with new trend export 132, the one end of second tuber pipe 120 with be connected with first flange 170, the other end passes through second flange 170 and indoor unit 200's return air side intercommunication to realize the intercommunication of second tuber pipe 120 and return air side.

[ Filter Assembly ]

Referring to fig. 3, the filter assembly 140 is disposed inside the housing 130 to purify fresh air introduced into the housing 130.

The filter assembly 140 is of a three-layer type and is integrally of a hollow cylindrical structure, a hollow cavity of the filter assembly is communicated with the fresh air inlet 131, fresh air introduced from the first air pipe 110 directly flows into the hollow cavity of the filter assembly 140, and then flows to the second air pipe 120 after sequentially flowing through the PP filter layer, the PM2.5 filter layer and the activated carbon filter layer.

The PP filter layer is made of PP as a main material, can be washed by water for repeated use and is mainly used for filtering dust in air; the PM2.5 filter layer is made of non-woven fabrics, cannot be washed, is disposable and is mainly used for filtering PM2.5 particles in air; the main material of the active carbon filter layer is active carbon, the active carbon filter layer has a honeycomb structure, can not be washed by water and can be exposed to the sun, and the active carbon filter layer is mainly used for removing volatile organic compounds such as formaldehyde, methylbenzene and the like in the air.

[ mounting of Filter Assembly ]

Referring to fig. 3 and 6, a column 134 is disposed inside the housing 130, a tension bolt 136 is screwed on the column 134, one end of the tension bolt 136 is connected to the fixing end cap 135, and the filter assembly 140 is detachably clamped between the fixing end cap 135 and the fresh air inlet 131 to achieve fixing and installation of the filter assembly 140.

A concave part 133 is arranged on one side of the inner wall of the shell 130 close to the fresh air inlet 131, and one end of the filter assembly 140 is matched with the concave part 133.

The fixed end cover 135 is disc-shaped, the fixed end cover 135 is fixedly connected with one end of the elastic bolt 136, and the fixed end cover 135 is matched with the other end of the filter assembly 140 and can cover the hollow cavity of the filter assembly 140.

When the filter assembly 140 is installed, one end of the filter assembly 140 is inserted into the recess 133, the other end of the filter assembly 140 faces the fixed end cap 135, the loose-bolt 136 is screwed towards one side close to the filter assembly 140, and the fixed end cap 135 moves towards the filter assembly 140, so that the filter assembly 140 is clamped between the fixed end cap 135 and the recess 133, and the filter assembly 140 is fixedly installed.

The fixed end cap 135 seals the hollow cavity of the filter assembly 140, so that the fresh air flowing into the hollow cavity of the filter assembly 140 from the fresh air inlet 131 can all flow through the filter layer for filtering, and the filtering effect is improved.

The filter assembly 140 may need to be removed for cleaning or replacement after a period of use to ensure filtration.

When the filter assembly 140 is disassembled, the fixing end cap 135 moves towards the side far from the filter assembly 140 by screwing the loose-bolts 136 towards the side far from the filter assembly 140, so that the filter assembly 140 is disassembled from the space between the fixing end cap 135 and the recess 133, and the operation is convenient.

[ mounting of second air duct ]

Referring to fig. 7, a reserved opening 220 is formed in the side wall of the air return side of the indoor unit 200, a second flange 250 is fixedly mounted at a position, opposite to the reserved opening 220, on the outer side wall of the indoor unit 200 through a screw, a through hole of the second flange 250 is opposite to the reserved opening 220, and one end of the second air pipe 120 is connected with the second flange 250, so that the fresh air introducing unit 100 is communicated with the indoor unit 200.

The reserved opening 220 is a hole capable of being broken through, a blocking plate 230 is arranged at the reserved opening 220, and the shape of the blocking plate 230 is matched with that of the reserved opening 220.

Several intermittent connecting parts 231 are arranged on the peripheral wall of the blocking plate 230 and are connected with the side wall of the reserved opening 220, so that the connection between the blocking plate 230 and the reserved opening 220 is realized, meanwhile, the connecting parts 231 are convenient to break, and the blocking plate 230 is removed from the reserved opening 220.

Due to the existence of the connection portion 231, a gap 240 may exist between the blocking plate 230 and the reserved port 220, a PE paste (not shown) is pasted at the gap 240, if a user does not need to introduce fresh air, the normal performance and the aesthetic property of the indoor unit 200 may not be affected by the blocking of the reserved port 220 by the blocking plate 230 and the plugging of the gap 240 by the PE paste, and at this time, the second flange 250 is not installed at the reserved port 220.

If the user needs to introduce fresh air, the connecting part 231 is broken, the PE is adhered and removed, the blocking plate 230 is detached, the reserved opening 220 is exposed, the second flange 250 is fixedly installed on the outer side wall of the indoor unit 200 through screws, the through hole of the second flange 250 is opposite to the reserved opening 220, the second air pipe 120 is connected with the second flange 250, and the fresh air introducing unit 100 can be communicated with the indoor unit 200.

The detachable connection mode improves the use convenience of the fresh air introducing unit 100 as an optional part.

[ mounting position of fresh air introducing Unit ]

The fresh air introducing unit 100 may be installed in a balcony or a bathroom, or may be flexibly disposed according to an indoor structure, and preferably the first duct 110 and the second duct 120 are as short as possible for easy maintenance.

[ static pressure requirement ]

The length of the first and

second ducts

110, 120 should not be too long, which would result in excessive static pressure and insufficient fresh air intake.

Static pressure calculation of return air and fresh air of the indoor unit 200 is required, and static pressure of fresh air of which the return air static pressure of the indoor unit 200 is less than or equal to 10 times is guaranteed.

[ humidifier ]

Referring to fig. 3, 5 and 6, the fresh air introducing unit 100 further includes a humidifier 150 for humidifying the fresh air filtered by the filtering component 140 in the housing 130.

The humidifier 150 adopts an ultrasonic humidifying mode, and has a remarkable humidifying effect.

The humidifier 150 is connected with a water inlet pipe 151, and the water inlet pipe 151 is communicated with an indoor faucet through a water path so as to supply water to the humidifier 150 in time.

[ air valve ]

Referring to fig. 5, the fresh air introducing unit 100 further includes an air valve 180 disposed at the fresh air outlet 132, and the air valve 180 has a plurality of openings so as to provide an appropriate fresh air volume to the room according to the indoor fresh air requirement.

For example, the damper 180 has four openings, 25%, 50%, 75%, and 100%, respectively.

[ maintenance board ]

Referring to fig. 2 and 4, a maintenance plate 137 is disposed on one side of the housing 130, and the maintenance plate 137 is rotatably connected to the housing 130 by a hinge 139, so that when components such as the filter assembly 140 and the humidifier 150 inside the housing 130 need to be maintained or replaced, the maintenance plate 137 is lifted to expose the inner cavity of the housing 130, thereby facilitating the operation.

[ fresh air controller ]

The fresh air controller 160 is electrically connected to the master controller 4 of the multi-connected air conditioning system, and the fresh air controller 160 controls the cleaning and replacement reminding of the humidifier 150, the air valve 180, and the filter assembly 140 in the fresh air introducing unit 100 according to the instruction of the master controller 4 of the multi-connected air conditioning system.

The fresh air controller 160 is provided inside the casing 130, see fig. 5.

[ control of Filter Assembly ]

A prompt identifier (such as a flashing icon) is arranged on a user operation interface of the indoor unit 200, the fresh air controller 160 accumulates and calculates the opening time of the air valve 180, if the opening time of the air valve 180 exceeds a system set value (such as 2000 h), the fresh air controller 160 sends a command request that the filter component 140 needs to be cleaned and replaced to the master controller 4, and the master controller 4 prompts the prompt identifier to act, so as to prompt a user to clean and replace the filter component 140 in time.

[ control of humidifier ]

A humidity detector is arranged at the air return opening of the indoor unit 200 and used for detecting the air return humidity at the air return opening of the indoor unit 200.

If the return air humidity is lower than the minimum humidity set value (for example, 25%), the newly introduced fresh air needs to be humidified, at this time, the fresh air controller 160 controls the humidifier 150 to be turned on to humidify the fresh air, and the humidified fresh air is mixed with the return air of the indoor unit 200, so that the outlet air humidity of the indoor unit is increased.

If the return air humidity is greater than the maximum humidity set value (for example, 50%), the newly introduced fresh air does not need to be humidified, and at this time, the fresh air controller 160 controls the humidifier 150 to be turned off, and the humidification of the fresh air is stopped.

[ control of the air valve ]

After the indoor unit 200 is connected to the fresh air introduction unit 100, its own capacity needs to be enlarged, and appropriate correction is performed according to the difference in the opening degree of the air valve 180.

In some embodiments of the present application, S = Sb (0.9+ E0.25), where S is the corrected capacity of the indoor unit 200, Sb is the set capacity of the indoor unit 200, and E is the percentage of the opening of the damper 180, thereby achieving the self-adjusting function of the fresh air load.

During cooling or heating, the initial opening degree of the expansion valve 3 in the multi-connected air conditioning system is increased, and during cooling, the opening degree of the expansion valve 3 in the indoor unit is adjusted according to the exhaust superheat degree and the superheat degree of the heat exchanger 2 in the indoor unit, so that the throttling of the refrigerant is realized.

The opening degree of the expansion valve 3 of the indoor unit is adjusted according to the supercooling degree of the indoor unit 200 during heating, thereby distributing the refrigerant to the indoor units 200.

After the fresh air introducing unit 100 is opened, the air valve 180 is defaulted to the minimum opening degree, so that the indoor unit 200 can be gradually corrected.

The normal multi-split air conditioner can only consider the load of the indoor unit 200, if fresh air is added, the fresh air load can be increased, the load needs to be considered, the fresh air load can be complemented by the super-match performance of the multi-split air conditioner, namely, the refrigerant flow of the indoor unit 200 introduced by the introduced fresh air needs to be increased to bear the ventilation load, the ventilation load can be realized by adjusting the opening degree of the expansion valve, and the magnitude of the correction value is determined by the opening degree of the air valve 180.

[ flow direction of fresh air in fresh air introducing Unit ]

Since the second air duct 120 is communicated with the return air side of the indoor unit 200, the interior of the fresh air introducing unit 100 will also have a certain negative pressure under the suction force of the blower 210 in the indoor unit 200; the outside fresh air flows into the inner cavity of the filter assembly 140 through the first air pipe 110 and the fresh air inlet 131; fresh air penetrates through the peripheral wall of the filter assembly 140 and enters the inner cavity of the shell 130 after being filtered; then flows into the second air duct 120 from the fresh air outlet 132; and then flows into the return air side of the indoor unit 200 from the second duct 120; and finally, the air is mixed with return air on the return side of the indoor unit 200 and flows out from the air outlet of the indoor unit 200.

[ operating conditions of the multiple air-conditioning system ]

The multi-connected air conditioning system has four working states, namely refrigeration + fresh air, heating + fresh air, air supply + fresh air and dehumidification + fresh air.

According to the first invention concept, the fresh air introducing unit 100 can be detachably communicated with the indoor unit 200 as an optional part, so that the fresh air introducing requirement of the multi-connected air conditioning system is met, the installation is convenient, and the energy consumption is low.

According to the second inventive concept, the fresh air introducing unit 100 is provided with the filtering component 140, so that the fresh air is filtered, and the fresh air quality is improved.

According to the third inventive concept, the filter assembly 140 is clamped between the fixing end cap 135 and the fresh air inlet 131 by the tension bolts 136, thereby facilitating the removal and installation of the filter assembly 140.

According to the fourth inventive concept, the filter assembly 140 is a hollow cylindrical structure, one end of the filter assembly 140 is communicated with the fresh air inlet 131, and the other end of the filter assembly 140 is blocked by the fixed end cover 135, so that the fresh air flowing in from the fresh air inlet 131 can be filtered by the three filter layers, and the filtering effect is improved.

According to the fifth inventive concept, the housing 130 of the fresh air introducing unit 100 is provided with the maintenance plate 137, and the maintenance plate 137 is rotatable (for example, turned upward) relative to the housing 130 so as to expose the inner cavity of the housing 130, thereby facilitating maintenance of the components such as the inner filter assembly 140 and the humidifier 150.

According to the sixth inventive concept, the sidewall of the indoor unit 200 is provided with the reserved opening 220, the breakable blocking plate 230 is disposed at the reserved opening 220, the reserved opening 220 serves as a spare installation position, the installation requirement of the fresh air introducing unit 100 is met, and the second air duct 120 can be easily communicated with the indoor unit 200 through the second flange 250, so that the installation is facilitated.

According to the seventh inventive concept, the humidifier 150 is disposed in the fresh air introducing unit 100 to humidify the filtered fresh air, so as to improve the quality of the fresh air and meet the humidity requirement of the user on the indoor air.

According to the eighth inventive concept, the air valve 180 in the fresh air introducing unit 100 has a plurality of openings, so as to satisfy different fresh air requirements of users to provide an appropriate fresh air volume.

According to the ninth inventive concept, the fresh air controller 160 is electrically connected to the master controller 4 of the multi-connected air conditioning system, so as to realize the linkage control of the fresh air introducing unit 100 and the indoor unit 200, and correspondingly control the fresh air introducing unit according to the fresh air demand, humidity requirements and the like of the user, thereby improving the comfort level of the user.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A multi-connected air conditioning system, comprising:

an outdoor unit installed on a wall outdoors;

an indoor unit installed in an indoor space;

a refrigerant pipe guiding a flow of a refrigerant, the pipe communicating the outdoor unit with the indoor unit;

fresh air introducing unit, including:

the shell is provided with a fresh air inlet and a fresh air outlet;

the first air pipe is used for communicating the fresh air inlet with outdoor atmosphere and guiding outdoor fresh air to enter the shell;

the second air pipe is used for communicating the fresh air outlet with the air return side of the indoor unit and guiding the fresh air in the shell to enter the air return side of the indoor unit;

and the filtering component is arranged inside the shell and used for purifying fresh air introduced into the shell.

2. The multi-connected air conditioning system according to claim 1,

a reserved opening is formed in the side wall of the air return side of the indoor unit, and a plugging plate is detachably arranged at the reserved opening;

a second flange is arranged on the side wall of the air return side of the indoor unit, which is opposite to the reserved opening;

one end of the second air pipe is connected with the second flange.

3. The multi-connected air conditioning system according to claim 1,

the filter component is provided with a PP filter layer, a PM2.5 filter layer and an activated carbon filter layer, and fresh air introduced by the first air pipe sequentially passes through the PP filter layer, the PM2.5 filter layer and the activated carbon filter layer and then flows to the second air pipe.

4. The multi-connected air conditioning system according to claim 3,

the novel air purifier is characterized in that a stand column is arranged in the shell, a tightening bolt is screwed on the stand column, one end of the tightening bolt is connected with a fixed end cover, and the filter assembly is detachably clamped between the fixed end cover and the fresh air inlet.

5. The multi-connected air conditioning system according to claim 1,

the fresh air introducing unit further includes: the humidifier humidifies the fresh air filtered by the filtering component in the shell.

6. The multi-connected air conditioning system according to claim 5,

the humidifier is connected with a water inlet pipe, and the water inlet pipe is communicated with an indoor faucet through a water path.

7. The multi-connected air conditioning system according to claim 5,

the fresh air introducing unit further includes: and the air valve is arranged at the fresh air outlet and provided with a plurality of opening degrees.

8. The multi-connected air conditioning system according to claim 7,

and after the fresh air introducing device is opened, the air valve is defaulted to be at the minimum opening.

9. The multi-connected air conditioning system according to claim 7,

the fresh air introducing unit further includes: the fresh air controller controls the starting and stopping of the humidifier and the opening of the air valve;

and the fresh air controller is electrically connected with a master controller of the multi-connected air conditioning system.

10. The multi-connected air conditioning system according to claim 1,

and a maintenance plate is arranged on one side of the shell, and the maintenance plate is opened to expose the inner cavity of the shell.