Mixer components for air conditioning systems

Abstract

The present invention relates to a mixer assembly for an air conditioning system of an aircraft, wherein a first air conditioning assembly for supplying fresh air is connected to a cockpit of the aircraft via a first duct and is also connected to a mixing chamber of the mixer assembly via a sixth duct communicating with the first duct, and a second air conditioning assembly for supplying fresh air is connected to the mixing chamber via a third duct, wherein the mixing chamber is also communicated with at least one recirculation system and is configured to mix the fresh air with recirculation air from the recirculation system to obtain mixed air, and the mixed air is supplied to at least one passenger cabin of the aircraft via a fifth duct.

Description

Technical Field

[0001] The invention relates to a mixer assembly for an air conditioning system of an aircraft. Background Art

[0002] The cabin air distribution system is one of the key systems of the aircraft. It is mainly used to provide air with appropriate temperature, pressure and humidity to each cabin of the aircraft to ensure that the occupants have a comfortable temperature and pressure environment and sufficient fresh air.

[0003] The air mixer assembly is a key component of the cabin air distribution system. A typical aircraft air distribution system uses an air mixer assembly to fully mix fresh air from the refrigeration assembly and recirculated air from the cabin before supplying it to the cabin and cockpit.

[0004] The performance of the air mixer assembly affects whether a mixture of fresh air and recirculated air in a specified mixing ratio can be obtained, which in turn affects whether parameters such as cabin air temperature, pressure, and humidity can be adjusted to a reasonable range.

[0005] Figure 1 A schematic diagram of an air mixing system for an aircraft in the prior art is shown.

[0006] like Figure 1 As shown, the fresh air from the left air conditioning assembly AS1' and the right air conditioning assembly AS2' enters the mixing chamber MC' of the mixing system through the first valve V1' and the second valve V2' respectively. At the same time, the first recirculation system RS1' and the second recirculation system RS2 also pass into the mixing chamber MC'. Thus, the fresh air from the air conditioning assemblies AS1' and AS2' and the recirculation air from the recirculation systems RS1' and RS2' are mixed in the mixing chamber MC', and then are respectively delivered to the cockpit CC' and the passenger cabin PC'.

[0007] CN 205168918 U (publication date April 20, 2016) discloses an air mixer assembly for an aircraft air conditioning system, comprising a main mixer, a first premixing manifold and a second premixing manifold located on both sides of the main mixer, wherein outlets are provided on both sides of the top of the main mixer, one end of the first premixing manifold is connected to the main mixer, and the other end is connected to a first fresh air line and a first recirculation air line, and one end of the second premixing manifold is connected to the main mixer, and the other end is connected to a second fresh air line and a second recirculation air line.

[0008] A mixer assembly for an aircraft air conditioning system is known from CN 102892674 A (published on January 23, 2013), which discloses how to mix multiple air paths.

[0009] A mixer assembly for an aircraft air conditioning system is known from CN 102905975 A (publication date January 30, 2013).

[0010] In addition, with the development of aviation industry technology, the requirements for cabin air quality have increased, especially the requirements for air quality in the cockpit. Figure 1 The hybrid system shown has a further improved air distribution system. This air distribution system provides mixed air for the passenger cabin and can provide mixed air or fresh air (i.e. the air delivered to the cockpit does not contain recirculated air) for the cockpit.

[0011] Figure 2 One such air distribution system is shown in FIG. Figure 1 Compared with the air mixing system shown in FIG. 1 , the fresh air output by the left air conditioning assembly AS1 ′ can also be directly delivered to the cockpit CC′ via a pipeline provided with a third valve V3 ′. In addition, a fourth valve V4 ′ is added to the air passage between the mixing chamber MC′ and the cockpit CC′.

[0012] exist Figure 2 In the air distribution system shown, under normal conditions, the first valve V1' is open and the second valve V2' is closed. Thus, the air distribution system provides fresh air to the cockpit CC' and mixed air mixed in the mixing chamber MC' to the passenger cabin PC'.

[0013] In this case, if one air conditioning assembly in the air distribution system, for example, the left air conditioning assembly AS1' fails, the system closes the originally opened first valve V1' on the passage directly connecting the left air conditioning assembly AS1' and the cockpit CC', and opens the second valve V2'.

[0014] At this time, the air distribution system provides mixed air mixed in the mixing chamber MC' to both the cockpit CC' and the passenger cabin PC'. The mixed air contains recirculation air from the first recirculation system RS1' and the second recirculation system RS2' and fresh air from the right air conditioning assembly AS2'.

[0015] For the aircraft's air conditioning system, the requirement to provide fresh air to the cockpit in addition to mixed air increases the complexity of the aircraft's air distribution system. Figure 2 The air distribution system shown in the figure has a third valve and a fourth valve, which increases the number of components. In addition, since a separate pipeline is provided for directly supplying fresh air from the left air conditioning assembly AS1' to the cockpit, more holes need to be opened on the airtight bulkhead F' of the aircraft, which increases the number of holes opened on the airtight bulkhead and increases the difficulty of ensuring the airtightness of the airtight bulkhead. This puts higher requirements on the reliability of the air distribution system and the equipment and devices contained therein.

[0016] It is therefore desirable to provide a further improved mixer assembly for an aircraft air conditioning system. Summary of the invention

[0017] The object of the present invention is to provide a mixer assembly for an aircraft air conditioning system which is further improved compared to the above-mentioned prior art, and which can realize fresh air supply to the cockpit while reducing the number of components required for the system.

[0018] Another object of the present invention is to provide a mixer assembly for an aircraft air conditioning system, which has a simple structure and can be adapted to different installation spaces in the aircraft.

[0019] In order to solve the above technical problem, the present invention provides a mixer assembly for an air conditioning system of an aircraft.

[0020] The air conditioning system of the aircraft comprises a first air conditioning assembly and a second air conditioning assembly, for example, a left air conditioning assembly and a right air conditioning assembly, for supplying fresh air. The mixer assembly according to the present invention comprises a mixing chamber for mixing fresh air and recirculated air to obtain mixed air.

[0021] wherein the first air conditioning assembly is in fluid communication with the cockpit of the aircraft via a pipe and is also connected to a mixing chamber of the mixer assembly via another pipe communicating with the above-mentioned pipe,

[0022] wherein the second air conditioning assembly is connected to the mixing chamber via a further conduit; and

[0023] The mixing chamber is also connected to at least one recirculation system of the aircraft, and fresh air from the air conditioning component of the air conditioning system is mixed with recirculation air from the recirculation system to obtain mixed air.

[0024] In the mixer assembly of the present invention, unlike the prior art, the duct that directly connects the first air conditioning assembly to the cockpit to deliver fresh air is connected to another duct at a certain point downstream in the air flow direction, preferably after passing through the airtight bulkhead, and the latter is in fluid communication with the mixing chamber. This allows the fresh air from the first air conditioning assembly to be directly supplied to the cockpit and also to be supplied to the mixing chamber of the mixer assembly for further mixing.

[0025] Thus, the mixer assembly of the present invention allows, on the one hand, supplying fresh air to the cockpit of the aircraft, and, on the other hand, reduces the number of holes that need to be opened on the airtight bulkhead of the aircraft compared to the solutions in the prior art mentioned at the beginning. This helps to improve the airtightness of the airtight bulkhead, i.e., the difficulty and complexity of ensuring the airtightness of the airtight bulkhead is reduced compared to the prior art.

[0026] In particular, in one embodiment, the first air-conditioning component is connected to the mixing chamber through the first pipe via the sixth pipe, and the connection between the first pipe and the sixth pipe is arranged outside the airtight bulkhead, that is, the output part of the first air-conditioning component and the connection between the first pipe and the sixth pipe are located on both sides of the airtight bulkhead.

[0027] In a preferred embodiment, the downstream end of the sixth duct is configured to extend deep into the mixing chamber. The downstream of the sixth duct is arranged in the mixing chamber toward the outlet of the mixed gas in the mixing chamber, that is, the inlet of the connecting duct between the mixing chamber and the cabin of the aircraft, and away from other inlets for supplying fresh air and the inlet for supplying recirculated air in the mixing chamber, that is, away from the outlet of the connecting duct between the mixing chamber and the second valve air conditioning assembly and the outlet of the connecting duct between the mixing chamber and one or more recirculation systems. Such an arrangement can effectively reduce the pressure drop.

[0028] Particularly preferably, the downstream end of the sixth duct is arranged in the mixing chamber, in the vicinity of an inlet of a connecting duct between the mixing chamber and a passenger cabin of the aircraft.

[0029] In a preferred embodiment, the first air conditioning assembly and the second air conditioning assembly are further connected to each other through an additional pipe. In particular, the pipe is arranged inside the airtight bulkhead, that is, the first air conditioning assembly and the second air conditioning assembly are located on the same side relative to the airtight bulkhead. Such an arrangement enables the fresh air cooled and supplied by the first air conditioning assembly and the second air conditioning assembly to complement each other when necessary. For example, such an arrangement is advantageous when one of the air conditioning assemblies is not inoperative but the amount of fresh air outputted by it is insufficient.

[0030] Preferably, the mixer assembly further comprises:

[0031] a first valve disposed downstream of the first air conditioning assembly and upstream of the connection between the above-mentioned pipe connecting the first air conditioning assembly with the cockpit and another pipe leading to the mixing chamber,

[0032] a second valve disposed between the second air conditioning assembly and the mixing chamber,

[0033] The first valve and the second valve are configured so that when one of the first air conditioning assembly or the second air conditioning assembly fails, the first valve is closed and the second valve is opened. That is, when one air conditioning assembly fails, the fresh air supply to the cockpit is stopped, and the mixed air from the mixing chamber is supplied to both the cockpit and the cabin. Such a design ensures that even if one air conditioning assembly in the air conditioning system fails, the required air can be provided to the cockpit and the cabin by mixing the fresh air supplied by the other air conditioning assembly with the recirculated air, thereby improving the safety of the flight and the reliability of the mixer assembly itself and the air conditioning system including the mixer assembly.

[0034] In addition, compared with the prior art, the mixer assembly of the present invention can reduce the number of valves required when applied to the air conditioning system of an existing aircraft. This reduces the complexity of the system and helps to improve the reliability of the system. On the other hand, it also reduces the space required for the installation of the mixer assembly and the weight of the mixer assembly. This is beneficial for the compact onboard space and the weight of the aircraft.

[0035] In particular, the first valve is an electrically controlled one-way valve.

[0036] In particular, the second valve is a mechanical one-way valve.

[0037] The provision of the mechanical one-way valve and the electrically controlled one-way valve means that the mixer assembly itself does not require other actuators to actuate the first valve and the second valve, which reduces the number of components included in the mixer assembly, and also helps to reduce the complexity of the system and improve the reliability of the system, as well as reduce the space required for the installation of the mixer assembly and the total weight of the mixer assembly.

[0038] Thus, the mixer assembly according to the present invention can provide fresh air and mixed air to the cockpit and the cabin respectively with a simple structure, and can supply mixed air to both in an emergency, and can obtain a better mixing effect. The mixer assembly is particularly suitable for aircraft with a cockpit fresh air design, and is particularly suitable for installation in a cabin ceiling space with a narrow space.

[0039] In addition, the present invention also proposes an air conditioning system for an aircraft, which comprises two air conditioning components for supplying fresh air, such as a left air conditioning component and a right air conditioning component, and a mixer component as described in any of the above schemes.

[0040] It should be understood that the foregoing general description and the following detailed description illustrate various embodiments and are intended to provide an overview or framework for understanding the nature and character of the claimed subject matter. The accompanying drawings are included to provide a further understanding of the various embodiments and are incorporated in and constitute a part of this specification. The accompanying drawings illustrate the various embodiments described herein and, together with the description, serve to explain the principles and operation of the claimed subject matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] With reference to the above objects, the technical features of the present invention are clearly described in the following claims, and its advantages are apparent from the following detailed description with reference to the accompanying drawings, which show preferred embodiments of the present invention by way of example without limiting the scope of the inventive concept.

[0042] Figure 1 A schematic diagram showing a mixer assembly for an air conditioning system of an aircraft in the prior art is shown;

[0043] Figure 2 A schematic diagram of an air distribution system for an aircraft air conditioning system in the prior art is shown;

[0044] Figure 3 A schematic diagram showing a mixer assembly for an air conditioning system of an aircraft according to the present invention; and

[0045] Figure 4 A specific embodiment of a mixer assembly for an air conditioning system of an aircraft according to the present invention is shown.

[0046] Reference numerals list

[0047] AS1' (Prior Art) Left air conditioning assembly

[0048] AS2' (Prior Art) Right air conditioning assembly

[0049] F' (Prior Art) Airtight Bulkhead

[0050] CC' (Prior Art) Cockpit

[0051] PC' (Prior Art) Cabin

[0052] RS1' (Prior Art) First Recirculation System

[0053] RS2' (Prior Art) Second Recirculation System

[0054] MC' (Prior Art) Mixing Chamber

[0055] V1' (Prior Art) First Valve

[0056] V2' (Prior Art) Second Valve

[0057] V3' (Prior Art) Third Valve

[0058] V4' (Prior Art) Fourth Valve

[0059] AS1 First Air Conditioning Component

[0060] AS2 Second air conditioning unit

[0061] CC Cockpit

[0062] PC Cabin

[0063] RS1 First Recirculation System

[0064] RS2 Secondary Recirculation System

[0065] T1 First Pipe

[0066] T2 Second Pipe

[0067] T3 Third Pipe

[0068] T4 Fourth Pipe

[0069] T5 Fifth Pipe

[0070] T6 Sixth Pipe

[0071] V1 First valve

[0072] V2 Second valve

[0073] F Airtight bulkhead. DETAILED DESCRIPTION

[0074] Reference will now be made in detail to various embodiments of the present invention. Although the present invention will be described in conjunction with exemplary embodiments, it should be appreciated that this specification is not intended to limit the present invention to those exemplary embodiments. On the contrary, the present invention is intended to not only cover these exemplary embodiments, but also to cover various alternative forms, modified forms, equivalent forms and other embodiments that may be included within the spirit and scope of the present invention as defined by the appended claims. For ease of explanation and precise definition in the appended claims, the terms "upper", "lower", "inner" and "outer" are used to describe these features with reference to the position of the features of the exemplary embodiments shown in the drawings.

[0075] It should be noted that in this article, unless otherwise specified, the "upstream" and "downstream" used in describing the direction are defined with reference to the flow direction of air in the various ducts of the system, that is, close to the air conditioning component, the recirculation component is usually upstream, and close to the cabin or cockpit of the aircraft is usually downstream.

[0076] Figure 3 A schematic diagram of an air conditioning system of the present invention is shown, and Figure 4 A specific implementation form of an air conditioning system according to the present invention is shown.

[0077] The following will refer to Figure 3 and Figure 4 The arrangement of the mixer assembly of the present invention and its operation are described in more detail.

[0078] like Figure 3 As shown, the air conditioning system of the aircraft includes a first air conditioning module AS1 and a second air conditioning module AS2 which are connected to each other and are used to supply fresh air.

[0079] The air conditioning system including the mixer assembly is used to supply air to the cockpit CC and the passenger cabin PC of the aircraft respectively. Specifically, the mixer assembly includes:

[0080] Mixing chamber MC;

[0081] A first valve V1, through which the fresh air supply line from the first air conditioning assembly AS1 is directly passed into the cockpit CC or into the mixing chamber MC via another line further connected to the supply line;

[0082] The second valve V2, the fresh air supply line from the second air conditioning assembly AS2 is connected to the mixing chamber MC through the second valve V2.

[0083] The aircraft furthermore provides a first recirculation system RS1 and a second recirculation system RS2 which provide recirculation air and which, in the embodiment shown, both open into a mixing chamber MC.

[0084] In actual use, the mixing chamber of the mixer assembly may be in fluid communication with more or fewer recirculation systems, depending on the number of recirculation systems present in the aircraft.

[0085] In actual use, depending on the number of air conditioning components included in the air conditioning system of the aircraft, the mixing chamber of the mixer assembly may be in fluid communication with more or fewer air conditioning components.

[0086] When both the aircraft's air conditioning assemblies AS1 and AS2 are operating normally, the first valve V1 and the second valve V2 of the mixer assembly are both open. At this time, the cockpit CC is directly provided with fresh air from the first air conditioning assembly AS1, while another part of the fresh air from the first air conditioning assembly AS1 is passed through the pipeline of the mixer assembly into the mixing chamber MC for mixing. The fresh air from the second air conditioning assembly AS2 is also passed into the mixing chamber MC via the pipeline.

[0087] In the mixing chamber MC, part of the fresh air from the first air conditioning assembly AS1, the fresh air from the second air conditioning assembly AS2, and the recirculated air from the first recirculation system RS1 and the second recirculation system RS2 leading to the mixing chamber MC are mixed and then supplied to the passenger compartment PC.

[0088] In an emergency, for example, when the first air conditioning assembly AS1 or the second air conditioning assembly AS2 fails, the first valve V1 is closed, while the second valve V2 remains open.

[0089] In the event of failure of the first air conditioning assembly AS1, the first valve V1 is closed. Fresh air from the second air conditioning assembly AS2 is sent to the mixing chamber MC to be fully mixed with the recirculated air from the first recirculation system RS1 and the second recirculation system RS2. The resulting mixed air is then supplied to the cockpit CC and the passenger cabin PC via pipelines, respectively. That is, in this emergency, the air conditioning system supplies mixed air to the cockpit CC and the passenger cabin PC.

[0090] For another example, when the second air conditioning assembly AS2 fails, since the first valve V1 is closed, the fresh air from the first air conditioning assembly AS1 cannot be directly supplied to the cockpit CC and the mixing chamber MC through the air pipeline provided with the first valve V1 as in normal operation. Instead, the fresh air from the first air conditioning assembly AS1 passes through the pipeline connecting the first and second air conditioning assemblies AS1 and AS2, and passes through the pipeline provided with the second valve V2 to be sent to the mixing chamber MC.

[0091] In the mixing chamber MC, fresh air is mixed with recirculation air from the first recirculation system RS1 and the second recirculation system RS2 and is supplied from outlets of the mixing chamber MC to the cockpit CC and the passenger cabin PC, respectively.

[0092] and Figure 2 Compared with the air distribution system according to the prior art, Figure 3 The piping of the air-conditioning system shown to include the mixer assembly of the present invention does not need to be equipped with a third valve and a fourth valve, which reduces the number of components in the system, reduces the complexity of the system, improves the reliability of the system, and at the same time reduces the space required for system installation, so that the mixer assembly can be more widely adapted to various types of passenger aircraft, especially for application scenarios where the installation space of the distribution system is relatively limited.

[0093] In addition, since the air pipeline connecting the first air conditioning assembly AS1 and the mixing chamber MC is led out from the air pipeline connecting the first air conditioning assembly AS1 and the cockpit CC after passing through the airtight bulkhead, the number of holes opened on the airtight bulkhead F is reduced, and the airtight bulkhead F is relatively Figure 2 The airtight bulkhead F' in the prior art shown is easier to ensure airtightness because Figure 2 In the distribution system of the prior art shown, two completely independent air lines are provided between the left air conditioning assembly AS1' and the cockpit CC' and between the left air conditioning assembly AS1' and the mixing chamber MC', so additional separate holes are opened on the airtight bulkhead F'.

[0094] Furthermore, due to the reduction in the number of valves required and the corresponding reduction in the number of pipelines, the weight of the entire mixer assembly can also be reduced, which leaves weight margin for other onboard systems.

[0095] Go to Figure 4 , which shows a specific implementation of the air conditioning system of the present invention.

[0096] In this embodiment, an air conditioning system for an aircraft includes:

[0097] - a first air conditioning assembly AS1 connected to the cockpit CC by a first duct T1 and connectable to the mixing chamber MC of the mixer assembly via a sixth duct T6 communicating with the first duct T1 ;

[0098] - a second air conditioning assembly AS2, which is interconnected with the first air conditioning assembly AS1 through a second duct T2 and connected to the mixing chamber MC through a third duct T3;

[0099] - a recirculation system RS which opens into the mixing chamber MC via a fourth duct T4;

[0100] - A mixer assembly comprising:

[0101] - a mixing chamber MC, the mixer chamber MC being configured to communicate with the passenger compartment PC via a fifth duct T5;

[0102] - a first valve V1, which is a one-way electrically controlled valve and is disposed in the first pipe T1, downstream of the first air conditioning assembly AS1 and upstream of the connection between the first pipe T1 and the sixth pipe T6; and

[0103] - The second valve V2, which is also a one-way valve, is arranged on the third pipeline T3.

[0104] The first valve V1 is an electrically controlled one-way valve, which enables the first valve V1 to be closed by the control system ( Figure 3 , Figure 4 The first valve V1 is forcibly closed by the second valve V2 in the illustrated embodiment.

[0105] As a result, the mixer assembly itself does not require an actuator, which also improves the reliability of the mixer assembly.

[0106] The upstream end of the sixth pipe T6 is connected to the first pipe T1, so that when the first valve V1 is opened, a portion of fresh air from the first air conditioning assembly AS1 can flow into the mixing chamber MC, and the downstream end of the sixth pipe T6 penetrates deep into the mixing chamber MC.

[0107] In particular, if Figure 4 As shown, the sixth duct T6 extends a certain length after turning approximately ninety degrees in the mixing chamber until a downstream end for discharging fresh air from the first air conditioning assembly AS1 into the mixing chamber MC.

[0108] like Figure 4As can be seen in the figure, the sixth pipe T6 extends deep into the mixing chamber MC and is arranged so that the downstream end opening is away from the downstream end of the fourth pipe T4 and the downstream end of the third pipe T3, that is, away from the inlet for recirculation air entering the mixing chamber MC and the inlet for fresh air entering the mixing chamber MC, and toward the outlet of the mixing chamber MC.

[0109] In particular, the downstream end of the sixth pipe T6 is arranged near the upstream end of the fifth pipe T5 connecting the mixing chamber MC and the passenger compartment PC. Such an arrangement reduces the pressure drop loss.

[0110] The air conditioning system proposed in the present invention can provide fresh air supply to the cockpit under normal working conditions, and provide mixed air supply to the passenger cabin (including the kitchen, bathroom, crew lounge, crew lounge and other areas), wherein the mixed air is air obtained by mixing filtered recirculated air provided by the recirculation system and fresh air provided by the air conditioning components in a certain proportion, and when one of the air conditioning components included fails, the air conditioning system proposed in the present invention makes it possible to supply mixed air to both the cockpit and the passenger cabin.

[0111] The present invention can freely combine the various embodiments within the scope of the present invention, or can appropriately modify or omit the various embodiments.

Claims

1. A mixer assembly for an air conditioning system of an aircraft, the air conditioning system comprising a first air conditioning assembly (AS1) and a second air conditioning assembly (AS2) for supplying fresh air, The mixer assembly comprises a mixing chamber (MC) for mixing the fresh air and the recirculation air from the recirculation system to obtain mixed air. in, The first air conditioning assembly (AS1) is connected to the cockpit (CC) of the aircraft through a first duct (T1) and is also connected to the mixing chamber (MC) through a sixth duct (T6) communicating with the first duct; wherein the second air conditioning assembly (AS2) is connected to the mixing chamber (MC) via a third pipe (T3); wherein the mixing chamber is in communication with at least one recirculation system (RS) via a fourth pipe (T4); wherein the mixing chamber is also in fluid communication with at least one passenger cabin (PC) of the aircraft, and The mixing chamber (MC) is fluidically connected to the at least one passenger cabin (PC) via a fifth pipe (T5), and a downstream end of the sixth pipe (T6) is configured to face in the mixing chamber (MC) an end portion where the fifth pipe (T5) is connected to the mixing chamber (MC), and away from an end portion where the third pipe (T3) is connected to the mixing chamber (MC) and away from an end portion where the fourth pipe (T4) is connected to the mixing chamber (MC).

2. The mixer assembly according to claim 1, characterized in that The first air conditioning assembly (AS1) and the second air conditioning assembly (AS2) are connected to each other through a second pipe (T2).

3. The mixer assembly according to claim 2, characterized in that The mixer assembly further comprises: a first valve (V1), the first valve (V1) being disposed on the first pipe (T1), downstream of an end of the first pipe connected to the first air conditioning assembly (AS1) and upstream of a connection between the first pipe (T1) and the sixth pipe (T6); A second valve (V2), the second valve (V2) is arranged on the third pipe (T3) between the second air conditioning assembly (AS2) and the mixing chamber (MC).

4. The mixer assembly according to claim 3, characterized in that The first valve (V1) is an electrically controlled one-way valve.

5. The mixer assembly according to claim 4, characterized in that The second valve (V2) is a mechanical one-way valve.

6. A mixer assembly according to any one of claims 3 to 5, characterized in that The first valve (V1) and the second valve (V2) are arranged such that when the first air conditioning assembly (AS1) fails or the second air conditioning assembly (AS2) fails, the first valve (V1) is closed and the second valve (V2) is opened.

7. The mixer assembly according to claim 1, characterized in that The downstream end of the sixth pipe (T6) is located near the end of the fifth pipe (T5) connected to the mixing chamber (MC).

8. The mixer assembly according to claim 7, characterized in that The mixing chamber (MC) is in communication with the first recirculation system (RS1) and the second recirculation system (RS2).

9. An air conditioning system for an aircraft, characterized in that: Include: a first air conditioning assembly (AS1) for supplying fresh air; a second air conditioning assembly (AS2) for supplying fresh air; and A mixer assembly as claimed in any one of claims 1 to 8.

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