Fresh air conditioner

Abstract

The fresh air conditioner comprises a total heat exchanger and a refrigerant system, the refrigerant system comprises an air exhaust heat exchanger, an air inlet heat exchanger and an auxiliary heat exchanger which are connected together through a refrigerant pipeline, an ice melting section is arranged below the air exhaust heat exchanger, and at least part of the ice melting section extends into a water pan; one end of the air exhaust heat exchanger is connected with the auxiliary heat exchanger and the ice melting section, and the other end of the ice melting section is connected with the air inlet heat exchanger. In the heating state in winter, the ice melting section is connected with the air inlet heat exchanger so that the temperature of the bottom of the air exhaust heat exchanger can be increased, condensate water in the water pan can be prevented from freezing, and the heating stability can be improved; in the summer refrigeration state or the non-cooling dehumidification state, the ice melting section located at the bottom of the air exhaust heat exchanger is connected with the output end of the air exhaust heat exchanger, the temperature of refrigerants circulating in the ice melting section is reduced after the refrigerants are cooled through the air exhaust heat exchanger, and the situation that the high-temperature refrigerants in the air exhaust heat exchanger damage the water receiving disc can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a fresh air air conditioner. Background Art

[0002] In recent years, people have higher and higher requirements for the quality of life, but environmental problems are becoming increasingly serious. Therefore, the capacity of the air purification market has developed rapidly in recent years, and the air-conditioning systems used to regulate indoor air temperature and air quality are also constantly updated and improved.

[0003] Compared with traditional air conditioners, fresh air air conditioners can provide better air quality. They combine air purification function and have functions such as dehumidification and humidification, providing better user experience. The heat exchanger in the fresh air air conditioner, as an important heat exchange and dehumidification component, plays a key role in the air conditioner. Due to the high comprehensive heat recovery efficiency in the fresh air air conditioner, the exhaust air temperature is below zero degrees in the winter heating state, and the water tray is at risk of freezing. Similarly, in the summer cooling and dehumidification state, the exhaust air temperature is high and the condenser is directly connected to the compressor exhaust. The temperature at the bottom of the condenser exceeds 80°C, and the plastic water tray is at risk of softening or even melting, resulting in incomplete discharge of condensed water.

[0004] The patent document with application number 202210465101.0 proposes a fresh air dehumidification integrated machine, which involves three heat exchangers, but does not involve an ice melting section in the heat exchanger, nor does it propose solutions to problems such as condensed water freezing or high temperature damage to the water receiving pan; The patent document with application number 202211580556.3 proposes a heat pump system for a washer-dryer, in which a precooling component and a supercooling component are preset in the heat exchange component. The refrigerant is supercooled by precooling and secondary utilization of the precooling water, so that the supercooling degree of the heat pump system is improved and the heat exchange efficiency of the heat exchange component is improved. The problem to be solved by this application is to improve the heat exchange efficiency and shorten the time, which is different from the purpose and means of this application; The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The object of the present invention is to provide a fresh air air conditioner to solve the problem in the prior art that in the winter heating state, the exhaust air temperature is below zero and the water receiving pan is at risk of freezing; in the summer cooling and dehumidification state, the exhaust air temperature is high and the condenser is directly connected to the compressor exhaust, the temperature at the bottom of the condenser is too high, and the water receiving pan is at risk of softening or even melting.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: The present application proposes a fresh air air conditioner, which comprises: Total heat exchanger; A refrigerant system, comprising a compressor, a four-way valve and a heat exchanger group connected together by a refrigerant pipeline, wherein the heat exchanger group comprises an exhaust heat exchanger, an inlet heat exchanger and an auxiliary heat exchanger, and a water receiving pan is arranged below the heat exchanger group; an ice melting section is arranged at the bottom of the exhaust heat exchanger, and the ice melting section at least partially extends into the water receiving pan; The exhaust heat exchanger is connected to the first valve port of the four-way valve, one end of the inlet heat exchanger is connected to the second valve port of the four-way valve, the input end of the compressor is connected to the third valve port of the four-way valve, and the output end of the compressor is connected to the fourth valve port of the four-way valve; The other end of the exhaust heat exchanger is connected to the auxiliary heat exchanger through the first refrigerant branch and to the ice melting section through the second refrigerant branch. The other end of the auxiliary heat exchanger is connected to the second refrigerant branch through the first refrigerant auxiliary circuit, and the other end of the ice melting section is connected to the other end of the inlet heat exchanger through the second refrigerant auxiliary circuit. A first expansion valve is provided on the first refrigerant branch, a second expansion valve is provided on the second refrigerant auxiliary circuit, and a switch component is provided on the second refrigerant branch, and the switch component is used to control the on and off of the second refrigerant branch and the flow direction of the refrigerant in the second refrigerant branch.

[0007] Compared with the prior art, the advantages and positive effects of the present invention are: The fresh air air conditioner involved in the present application, in the winter heating state, the exhaust heat exchanger is used as an evaporator, the bottom of the exhaust heat exchanger is connected to the ice melting section, the exhaust heat exchanger temperature is relatively low, and the ice melting section is connected to the air inlet heat exchanger, which can increase the temperature of the bottom of the exhaust heat exchanger, prevent the condensed water in the water tray from freezing, and improve the heating stability; In the summer cooling state or non-cooling and dehumidification state, the exhaust heat exchanger is connected to the output end of the compressor as a condenser, and the ice melting section at the bottom of the exhaust heat exchanger is connected to the output end of the exhaust heat exchanger. The refrigerant flowing in the ice melting section is cooled by the exhaust heat exchanger, and the temperature is reduced, which can avoid the high-temperature refrigerant in the exhaust heat exchanger from connecting to the water pan and causing damage; The fresh air air conditioner involved in the present application does not need to be equipped with an additional heating or cooling structure on the water receiving tray. The temperature of the water receiving tray can be adjusted by utilizing the state changes of the refrigerant passing through each heat exchanger, which is helpful to avoid the occurrence of problems such as condensed water freezing or damage to the water receiving tray.

[0008] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0010] Figure 1 is one of the internal structure schematic diagrams of the fresh air air conditioner according to the embodiment; Figure 2 The second schematic diagram of the internal structure of the fresh air air conditioner according to the embodiment; Figure 3 It is a schematic diagram of the connection of the refrigerant system; Figure 4 This is a schematic diagram of refrigerant circulation in heating state; Figure 5 This is a schematic diagram of refrigerant circulation in the cooling state; Figure 6 This is a schematic diagram of refrigerant circulation in the non-cooling and dehumidifying state; Figure 7 A schematic diagram of the connection between a heat exchanger group and a water receiving pan according to an embodiment; Figure 8 It is a schematic diagram of the seal position; Fig. 9 1. It is a schematic diagram of the structure of the water receiving tray; Fig.10 is a schematic diagram of the seal structure; Fig.11 It is a connection diagram of the exhaust heat exchanger, the inlet heat exchanger and the auxiliary heat exchanger; Fig.12 It is a schematic diagram of the disassembly of the first connecting member, the second connecting member and the first fixing member; Fig.13 It is a schematic diagram of the connection of the refrigerant pipe group between the compressor and the heat exchanger group; Fig.14 yes Fig.13 A is an enlarged schematic diagram; Fig.15 is a schematic diagram of the position of the inspection port according to an embodiment; Fig.16 A schematic diagram of disassembling the inspection cover according to the embodiment; Fig.17 A schematic diagram of disassembling a heat exchange core according to an embodiment; Fig.18 is a schematic diagram of the structure of the lower cover according to an embodiment; Fig.19 is a schematic diagram of an inspection cover according to an embodiment; Fig. 20It is a schematic diagram of heat exchange core installation; Fig.21 is a schematic diagram of the support assembly; Fig. 22 It is a schematic diagram of the splitting of the fixed support; Fig.23 It is a schematic diagram of the disassembly of the movable support; Fig.24 1. It is a schematic diagram of the disassembly state of the detachable bracket; Fig.25 Schematic diagram of the location of the heat exchange bracket; Fig.26 It is a schematic diagram of the location of the bridge components; Fig. 27 It is a schematic diagram of the bridge assembly structure; Fig.28 This is a schematic diagram of the bridge assembly disassembly; Fig.29 It is a schematic diagram of the disassembly of the outer shell, the horizontal support frame and the vertical frame according to the embodiment; Fig.30 A schematic diagram of disassembling a blocking member and a stand according to an embodiment; Fig.31 This is one of the schematic diagrams of the stand structure according to the embodiment; Fig.32 This is the second schematic diagram of the stand structure; Fig.33 1. It is a schematic diagram of the structure of the plugging piece; Fig.34 It is a schematic diagram of disassembling the foaming part, the wire-passing part and the outer shell according to the embodiment; Fig.35 is a schematic diagram of the structure of a wire-passing member according to an embodiment; Fig.36 is a schematic diagram of the planar structure of a fresh air air conditioner according to an embodiment; Fig.37 for Fig.36 AA section view in; Fig.38 for Fig.36 The enlarged schematic diagram of point B in FIG. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0012] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0013] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0014] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0015] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0016] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0017] The fresh air air conditioner provided in this embodiment performs a cooling and heating cycle of the air conditioner by using a compressor 500, a condenser, an expansion valve and an evaporator. The cooling and heating cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies a refrigerant medium to the conditioned and heat-exchanged air.

[0018] The air conditioner in the present application performs a refrigeration cycle of the air conditioner by using a compressor 500, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation to cool or heat the indoor space.

[0019] The low-temperature and low-pressure refrigerant enters the compressor 500, which compresses it into a high-temperature and high-pressure refrigerant gas 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.

[0020] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid 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 500. The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0021] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including the compressor 500 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.

[0022] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0023] The way in which the air inlet heat exchanger 300 and the air outlet heat exchanger 400 are switched to function as a condenser or an evaporator generally uses a four-way valve 10 , and specific reference is made to the settings of conventional air conditioners, which will not be elaborated here.

[0024] The refrigeration working principle of the air conditioner is: the compressor 500 works to make the air inlet heat exchanger 300 (in the air inlet channel, it is the evaporator at this time) in an ultra-low pressure state, and the liquid refrigerant in the air inlet heat exchanger 300 evaporates rapidly to absorb heat, and the wind blown out by the indoor fan is cooled by the coil of the air inlet heat exchanger 300 and becomes cold air blown into the room. The evaporated refrigerant is pressurized by the compressor 500 and condensed into liquid under the high pressure environment of the exhaust heat exchanger 400 (in the exhaust channel, it is the condenser at this time), releasing heat, and dissipating the heat into the atmosphere through the exhaust fan 700. Such a cycle achieves the refrigeration effect.

[0025] The heating working principle of the air conditioner is as follows: the gaseous refrigerant is pressurized by the compressor 500, becomes a high-temperature and high-pressure gas, enters the air inlet heat exchanger 300 (the condenser at this time), condenses and liquefies to release heat, becomes a liquid, and heats the indoor air at the same time, thereby achieving the purpose of increasing the indoor temperature. The liquid refrigerant is decompressed by the throttling device and enters the exhaust air heat exchanger 400 (the evaporator at this time), evaporates and absorbs heat to become a gas, and at the same time absorbs heat from the outdoor air (the outdoor air becomes colder), becomes a gaseous refrigerant, and enters the compressor 500 again to start the next cycle.

[0026] The heat exchange fresh air fan mainly includes a total heat exchanger and a refrigerant system, wherein the total heat exchanger is used to realize heat exchange between indoor exhaust air and outdoor fresh air, and the refrigerant system exchanges heat with the air through the air inlet heat exchanger 300, thereby changing the indoor ambient temperature.

[0027] refer to Figure 1 , Figure 2 The fresh air air conditioner involved in the present application includes a full heat exchanger and a refrigerant system. The full heat exchanger includes an outer shell 100 and a heat exchange core 200, an exhaust fan 700 and an air intake fan 600 arranged in the outer shell 100.

[0028] On the outer shell 100 , an outdoor air inlet 101 and an outdoor air outlet 102 are formed on the side communicating with the outdoors, and an indoor air supply port 103 and an indoor air return port 104 are formed on the side communicating with the indoors.

[0029] An installation cavity is formed in the outer shell 100, and a longitudinal partition extending longitudinally is arranged in the installation cavity, and both ends of the longitudinal partition extend to the inner side of the outer shell 100 respectively; a transverse partition is arranged on one side of the longitudinal partition, and a heat exchange core 200 is arranged on the other side.

[0030] The outer shell 100 , the transverse partition and the longitudinal partition respectively divide the installation inner cavity into an indoor air supply area 1031 connected to the indoor air supply port 103 and an outdoor air exhaust area 1021 connected to the outdoor air exhaust port 102 .

[0031] The outer shell 100 , the heat exchange core 200 and the longitudinal partition divide the installation cavity into an indoor return air area 1041 connected to the indoor return air port 104 and an outdoor air inlet area 1031 connected to the outdoor air inlet 101 .

[0032] The exhaust air duct is formed between the indoor return air outlet 104 and the outdoor exhaust air outlet 102 , and the inlet air duct is formed between the outdoor inlet air outlet 101 and the indoor supply air outlet 103 .

[0033] The air inlet fan 600 is located in the air inlet passage, and the air exhaust fan 700 is located in the air exhaust passage.

[0034] The air inlet fan 600 is turned on to drive the outdoor air flow to be transported to the indoor through the air inlet channel, and the exhaust fan 700 is started to drive the indoor air flow to be output to the outdoor through the exhaust duct.

[0035] The refrigerant system includes a compressor 500 , a four-way valve 10 , and a heat exchanger group connected together through a refrigerant pipeline. The heat exchanger group specifically includes an exhaust heat exchanger 400 , an intake heat exchanger 300 , and an auxiliary heat exchanger 310 .

[0036] The compressor 500 is located in the outdoor air inlet area 101, the exhaust heat exchanger 400 is longitudinally arranged between the outdoor air inlet area 1011 and the outdoor exhaust area 1021, the air inlet heat exchanger 300 is longitudinally arranged between the indoor supply air area 1031 and the indoor return air area 1041, and the auxiliary heat exchanger 310 is arranged side by side on the airflow output side of the air inlet heat exchanger 300.

[0037] refer to Figure 3 The four-way valve 10 specifically includes a first valve port 11, a second valve port 12, a third valve port 13 and a fourth valve port 14. The first valve port 11 is connected to the exhaust heat exchanger 400, the second valve port 12 is connected to the intake heat exchanger 300, the third valve port 13 is connected to the input end of the compressor 500, and the fourth valve port 14 is connected to the output end of the compressor 500.

[0038] A water receiving pan 900 is disposed below the heat exchanger group, and an ice melting section 410 is disposed below the exhaust heat exchanger 400. An ice melting pipe section is formed in the ice melting section 410, and the ice melting section 410 at least partially extends into the water receiving pan 900.

[0039] Below, each working component in the refrigerant system is described in detail: Among them, the exhaust heat exchanger 400 is connected to the first valve port 11 of the four-way valve 10 through the first refrigerant main circuit 21, and two refrigerant passages extend from the other end of the exhaust heat exchanger 400, one of which is connected to the auxiliary heat exchanger 310 through the first refrigerant branch circuit 23, and the other is connected to the ice melting section 410 through the second refrigerant branch circuit 24, and the other end of the auxiliary heat exchanger 310 is connected to the second refrigerant branch circuit 24 through the first refrigerant auxiliary circuit 25, that is, the refrigerant output from the auxiliary heat exchanger 310 is also connected to the ice melting section 410 through the first refrigerant auxiliary circuit 25.

[0040] The first refrigerant branch 23 is provided with a first expansion valve 30, and the second refrigerant branch 24 is provided with a switch member for controlling the on-off of the second refrigerant branch 24 and the flow direction of the refrigerant in the second refrigerant branch 24. The switch components are specifically a switch valve 40 and a one-way valve 50. The switch valve 40 is specifically used to control the on-off of the second refrigerant branch 24, and the one-way valve 50 is used to control the one-way flow of the refrigerant from the exhaust heat exchanger 400 through the switch valve 40 to the ice melting section 410.

[0041] Of course, the switch element is not limited to the above implementation method, and other forms of switch elements can also be used to achieve the purpose of opening and closing the second refrigerant branch 24 and the unidirectional flow of the refrigerant.

[0042] The other end of the ice melting section 410 is connected to the air inlet heat exchanger 300 via the second refrigerant auxiliary circuit 26 , and a second expansion valve 60 is provided on the second refrigerant auxiliary circuit 26 .

[0043] The air inlet heat exchanger 300 is connected to the second valve port 12 of the compressor 500 through the second refrigerant main path 22 .

[0044] The expansion valve is a commonly used component in the refrigeration system. It is installed between the condenser and the evaporator to play the role of throttling and reducing pressure. In order to prevent impurities from being deposited when the refrigerant passes through the first expansion valve 30 and the second expansion valve 60, filters 70 are connected to both ends of the first expansion valve 30 and the second expansion valve 60 respectively.

[0045] The design of the ice melting section 410 in the fresh air air conditioner can avoid the exhaust heat exchanger 400 from being too cold and freezing the water tray 900 in the winter heating state; or in the summer cooling state without cooling and dehumidification, the exhaust heat exchanger 400 is directly connected to the output end of the compressor 500, causing the water tray 900 to soften and be damaged.

[0046] The first refrigerant main circuit 21 and the first refrigerant branch circuit 23 are also provided with charging valves 80 for replenishing refrigerant into the pipelines.

[0047] refer to Figure 4In the heating mode, the fourth valve port 14 of the compressor 500 is connected to the second valve port 12, the third valve port 13 is connected to the first valve port 11, and the second expansion valve 60 is in a fully open state, which does not play a throttling and pressure-reducing role on the refrigerant passing through.

[0048] In this state, the air inlet heat exchanger 300 and the auxiliary heat exchanger 310 act as condensers, and the air outlet heat exchanger 400 acts as an evaporator.

[0049] The refrigerant output from the compressor 500 passes through the fourth valve port 14 and the second valve port 12 of the four-way valve 10, and is input into the air inlet heat exchanger 300 through the second refrigerant main path 22. The refrigerant output after heat exchange in the air inlet heat exchanger 300 passes through the second expansion valve 60 and the ice melting section 410 and is input into the auxiliary heat exchanger 310. The refrigerant output from the auxiliary heat exchanger 310 is reduced in pressure and throttled by the first expansion valve 30 to become a low-temperature and low-pressure liquid refrigerant. After evaporation and heat absorption in the exhaust heat exchanger 400, it is input back into the compressor 500.

[0050] In this state, the exhaust heat exchanger 400 is an evaporator with a relatively low surface temperature. After it directly contacts the water receiving pan 900, the condensed water in the water receiving pan 900 is easily frozen. The present application sets an ice melting section 410 at the bottom of the exhaust heat exchanger 400. Since the refrigerant passing through the ice melting section 410 is in a medium temperature and high pressure state, it can be used to heat the condensed water in the water receiving pan 900, thereby effectively preventing the condensed water from freezing.

[0051] refer to Figure 5 In the cooling mode, the fourth valve port 14 of the compressor 500 is connected to the first valve port 11, the third valve port 13 is connected to the second valve port 12, the switch valve 40 is opened, the auxiliary heat exchanger 310 is bypassed, the inlet heat exchanger 300 is an evaporator, and the exhaust heat exchanger 400 is a condenser.

[0052] The refrigerant output from the compressor 500 flows into the exhaust heat exchanger 400 through the four-way valve 10 , and the refrigerant output from the exhaust heat exchanger 400 is directly input into the ice melting section 410 from the second refrigerant branch 24 .

[0053] Since the exhaust heat exchanger 400 acts as a condenser in this state, it is connected to the output end of the compressor 500. The high-temperature and high-pressure refrigerant output by the compressor 500 is directly connected to the water receiving pan 900 in the exhaust heat exchanger 400, which can easily cause the water receiving pan 900 to deform due to heat.

[0054] An ice melting section 410 is provided at the bottom of the exhaust heat exchanger 400, and the ice melting section 410 is connected to the output end of the exhaust heat exchanger 400. The refrigerant cooled by the exhaust heat exchanger 400 passes through the ice melting section 410 after being cooled. The ice melting section 410 is connected to the water receiving pan 900, so that the water receiving pan 900 can avoid being directly connected to the exhaust heat exchanger 400. The ice melting section 410 has a cooling effect on the bottom of the exhaust heat exchanger 400 and the surface of the water receiving pan 900.

[0055] The refrigerant output from the ice melting section 410 is throttled by the second expansion valve 60 , enters the air inlet heat exchanger 300 for heat exchange, and is finally input back to the compressor 500 .

[0056] refer to Figure 6 In the non-cooling dehumidification mode, the fourth valve port 14 in the compressor 500 is connected to the first valve port 11, the third valve port 13 is connected to the second valve port 12, the switch valve 40 is closed, and the first expansion valve 30 is fully opened; the exhaust heat exchanger 400 and the auxiliary heat exchanger 310 are used as condensers, and the inlet heat exchanger 300 is an evaporator; The refrigerant output from the compressor 500 flows into the exhaust air heat exchanger 400 through the four-way valve 10 , and the refrigerant output from the exhaust air heat exchanger 400 passes through the auxiliary heat exchanger 310 and is input into the ice melting section 410 .

[0057] The ice melting section 410 is used to cool the condensed water in the exhaust air heat exchanger 400 and the water receiving pan 900. The refrigerant output from the ice melting section 410 is throttled by the second expansion valve 60, enters the air inlet heat exchanger 300 for heat exchange, and is finally output back to the compressor 500.

[0058] In the non-cooling dehumidification mode, the refrigerant output through the auxiliary heat exchanger 310 is cooled to a low-temperature and high-pressure liquid refrigerant. The refrigerant in this state is introduced into the bottom of the condenser through the ice melting section 410 to cool the bottom of the exhaust heat exchanger 400 and the surface of the water receiving pan 900, preventing the high-temperature refrigerant on the upper part of the exhaust heat exchanger 400 from being directly conducted to the water receiving pan 900, causing damage to the water receiving pan 900.

[0059] refer to Figure 7 The air inlet heat exchanger 300 and the air exhaust heat exchanger 400 are fixed in the installation cavity through the heat exchange bracket 800.

[0060] The air inlet heat exchanger 300 and the air exhaust heat exchanger 400 are longitudinally mounted on the heat exchange bracket 800, and both ends of the heat exchange bracket 800 extend to the indoor and outdoor sides of the entire installation cavity. At this time, the heat exchange bracket 800 serves as a longitudinal partition to achieve the purpose of partitioning the installation cavity.

[0061] That is, one end of the heat exchange bracket 800 is connected between the indoor air supply port 103 and the indoor air return port 104 , and the other end of the heat exchange bracket 800 is connected between the outdoor air exhaust port 102 and the outdoor air inlet 101 .

[0062] refer to Fig. 9 Corresponding to the exhaust heat exchanger 400 and the inlet heat exchanger 300 in the heat exchanger group, a downwardly extending water receiving chamber is formed in the water receiving tray 900, and the water receiving chamber is divided into a first water receiving area 901 and a second water receiving area 902 according to a specific position. The first water receiving area 901 is located below the inlet heat exchanger 300 and the auxiliary heat exchanger 310, and the exhaust heat exchanger 400 is located above the second water receiving area 902. The bottom surface height of the first water receiving area 901 is higher than the bottom surface height of the second water receiving area 902.

[0063] That is, there is a height difference between the bottom of the first water receiving area 901 and the bottom of the second water receiving area 902. The height difference design can offset the influence of the pressure difference formed between the indoor air supply area 1031 and the outdoor exhaust area 1021 on the discharge of condensed water after the air intake fan 600 and the exhaust fan 700 are turned on, thereby avoiding the problem that when the pressure in the outdoor exhaust area 1021 is greater than the pressure in the indoor air supply area 1031, the condensed water in the first water receiving area 901 cannot be completely discharged into the second water receiving area 902, and the condensed water in the first water receiving area 901 is not completely discharged.

[0064] The second water receiving area 902 is connected to the drainage assembly to discharge the condensed water in the water receiving tray 900 .

[0065] An upward supporting profile 903 is formed at the bottom of the first water receiving area 901 and the second water receiving area 902. The supporting profile 903 protrudes a certain height from the bottom of the water receiving tray 900 to support the heat exchanger group.

[0066] At least two support profiles 903 are spaced apart at the bottom of the exhaust heat exchanger 400, the intake heat exchanger 300 and the auxiliary heat exchanger 310, respectively. Then, the heat exchanger group is supported above the water receiving tray 900 to prevent the bottom of the heat exchanger group from being immersed in condensed water.

[0067] A drainage component is connected to the second water receiving area 902 for draining the condensed water in the second water receiving area 902 .

[0068] Combination Figure 8-Figure 10 In some embodiments of the present application, in order to prevent the airflow between the indoor air supply area 1031 and the outdoor air exhaust area 1021 from circulating between each other through the water receiving pan 900, a seal 910 is further provided between the air inlet heat exchanger 300, the auxiliary heat exchanger 310 and the water receiving pan 900.

[0069] A drainage channel is formed on the sealing member 910 for draining the condensed water in the first water receiving area 901 into the second water receiving area 902 .

[0070] The width of the sealing member 910 matches the width of the first water receiving area 901 . The sealing member 910 seals the indoor air supply area 1031 . The first water receiving area 901 discharges the condensed water from the drainage channel into the second water receiving area 902 .

[0071] Specifically, a mounting groove 911 adapted to the air inlet heat exchanger 300 and the auxiliary heat exchanger 310 is formed on the sealing member 910 , and the water inlet heat exchanger and the auxiliary heat exchanger 310 are supported in the mounting groove 911 .

[0072] A groove 912 is formed on the seal 910, and a drainage channel is formed between the groove 912 and the water receiving tray 900. Condensed water is discharged from the drainage channel on the seal 910, reducing the flow of air between the outdoor exhaust area 1021 and the indoor supply area 1031, thereby improving the working effect of the air conditioner.

[0073] In the traditional installation process of the heat exchanger group, each heat exchanger is generally fixed separately into the installation cavity. This installation method is limited by the installation space during the installation process, resulting in low installation efficiency and inconvenience for operators.

[0074] In addition, the separate installation of heat exchangers will lead to relatively large installation errors between them. The accumulation of errors will make the subsequent refrigerant pipeline installation inconvenient, and will also form a large installation gap, causing problems such as leakage of indoor and outdoor airflow.

[0075] In order to improve the speed of installation of each heat exchanger and reduce the installation error between heat exchangers, the fresh air heat exchanger proposed in the present application is pre-installed externally before the heat exchanger group is installed in the installation cavity.

[0076] The air inlet heat exchanger 300 and the auxiliary heat exchanger 310 are arranged side by side. The auxiliary heat exchanger 310 is located at the output end of the air inlet heat exchanger 300. Both ends of the air inlet heat exchanger 300 are detachably connected to the auxiliary heat exchanger 310.

[0077] refer to Fig.11 , Fig.12 Specifically, first connecting members 320 are provided at both ends of the air inlet heat exchanger 300, and second connecting members 330 are provided at both ends of the auxiliary heat exchanger 310. At least one first clamping portion 3211 is formed on the first connecting member 320 along its height direction, and a second clamping portion 3311 is formed on the second connecting member 330 to match the position of each first clamping portion 3211. In the installed state, the first clamping portion 3211 and the second clamping portion 3311 are connected.

[0078] Specifically, a first connecting outer edge 321 extending and bending to one side is formed on the first connecting member 320, a second connecting outer edge 331 bent in the same direction as the first connecting outer edge 321 is formed on the second connecting member 330, a first clamping portion 3211 is formed on the first connecting outer edge 321, and a second clamping portion 3311 is formed on the second connecting outer edge 331.

[0079] The first connecting outer edge 321 and the second connecting outer edge 331 located at both ends of the air inlet heat exchanger 300 and the auxiliary heat exchanger 310 may extend in the same direction or in opposite directions.

[0080] That is, the first connection outer edge 321 and the second connection outer edge 331 can both extend toward the heat exchanger and be covered on both sides of the heat exchanger; the first connection outer edge 321 and the second connection outer edge 331 can also both extend away from the heat exchanger; or, the first connection outer edge 321 and the second connection outer edge 331 at one end of the heat exchanger extend toward the heat exchanger, and the first connection outer edge 321 and the second connection outer edge 331 at the other end extend away from the heat exchanger; as long as it is ensured that, during the installation process, the first clamping portion 3211 and the second clamping portion 3311 at the two ends can be clamped with each other, it will be sufficient.

[0081] The first clamping portion 3211 or the second clamping portion 3311 is a buckle protruding from the surface of the first connecting outer edge 321 , and the second clamping portion 3311 or the first clamping portion 3211 is a notch formed on the second connecting outer edge 331 , and the size of the buckle is adapted to the notch.

[0082] The buckle can be a structure with an opening upward, or a structure with an opening downward that is snapped into the notch.

[0083] Taking the first clamping portion 3211 as a buckle structure and the second clamping portion 3311 as a notch structure as an example, the buckle is an example of a structure with the opening direction upward.

[0084] During the installation process, the auxiliary heat exchanger 310 is installed from top to bottom. As the auxiliary heat exchanger 310 moves downward, the second clamping parts 3311 at both ends are clamped on the outside of the first clamping parts 3211, and the buckles are connected to the notches to achieve the connection and fixation of the auxiliary heat exchanger 310 and the air inlet heat exchanger 300.

[0085] A first fixing member 340 is also provided above the first connecting member 320 and the second connecting member 330. The first fixing member 340 is a sheet metal structure, and a first overlapping portion 341 extending downward is formed at both ends of the first fixing member 340. The first overlapping portion 341 is detachably connected to the first connecting member 320 and the second connecting member 330 by fasteners, so as to further fix the air inlet heat exchanger 300 and the auxiliary heat exchanger 310.

[0086] A third connecting member 420 is provided at both ends of the exhaust heat exchanger 400, a second fixing member 430 is provided above the third connecting member 420, and a second overlapping portion extending downward is formed at both ends of the second fixing member 430, and the second overlapping portion is detachably connected to the third connecting member 420 through fasteners.

[0087] The first fixing member 340 and the second fixing member 430 are also used to connect with the heat exchange bracket 800. Specifically, a connecting flange extending in the direction of the air inlet heat exchanger 300 and the exhaust heat exchanger 400 is formed on the heat exchange bracket 800. The flange is located above the first fixing member 340 and the second fixing member 430 to connect and fix the air inlet heat exchanger 300 and the auxiliary heat exchanger 310 to the heat exchange bracket 800.

[0088] In addition, connecting holes are dispersedly formed on the first connecting member 320, the second connecting member 330 and the third connecting member 420. The position of each connecting hole is adapted to the position of the refrigerant pipe in the corresponding air inlet heat exchanger 300, the auxiliary heat exchanger 310 or the exhaust heat exchanger 400. The refrigerant pipeline in each heat exchanger passes through the corresponding connecting hole, so that the connection and fixation between the first connecting member 320 and the air inlet heat exchanger 300, the first connecting member 320 and the auxiliary heat exchanger 310, and the third heat exchanger and the exhaust heat exchanger 400 can be achieved.

[0089] Reference again Figure 7 A heat insulating member 440 is also provided above the exhaust heat exchanger 400, and the upper cover plate of the outer shell 100 is provided on the heat insulating member 440 to insulate the exhaust heat exchanger 400 and reduce heat loss.

[0090] refer to Fig.13 , Fig.14 The compressor 500 is connected to the heat exchanger group through a refrigerant pipe group. Specifically, the refrigerant pipe group includes a first pipe group 510 connected to the compressor 500 and a second pipe group 520 connected to the heat exchanger group. An insert section 530 is formed at the end of the second pipe group 520. The end of the first pipe group 510 is inserted into the insert section 530, and then welding is performed at the connection between the first pipe group 510 and the second pipe group 520.

[0091] refer to Figure 15-17 The outer shell 100 of the fresh air air conditioner specifically includes an upper cover plate 110 , a lower cover plate 130 , and a side plate group 120 located between the upper cover plate 110 and the lower cover plate 130 .

[0092] The upper cover plate 110 is used to connect to the roof of the building to hang the fresh air air conditioner as a whole in the building. The lower cover plate 130 is located below the fresh air air conditioner. The inspection port 131 is set on the lower cover plate 130 to facilitate maintenance by operators.

[0093] The outdoor air inlet 101 , the outdoor air outlet 102 , the indoor air supply outlet 103 and the indoor air return outlet 104 are formed on the side plate group 120 , and the installation cavity is surrounded by the upper cover plate 110 , the lower cover plate 130 and the side plate group 120 .

[0094] An inspection cover 140 is detachably connected to the inspection port 131 for closing the inspection port 131. In order to reduce the number of inspection ports 131 and improve the structural strength of the outer shell 100, the inspection port 131 is located directly below the heat exchange core 200 and is connected to the outdoor air inlet area 1011 and the indoor return air area 1041 on both sides of the heat exchange core 200.

[0095] Then, the inspection port 131 can be used as an inspection window of the heat exchange core 200 and at the same time, it can meet the inspection position of some working components in the outdoor air inlet area 1011 and the indoor return air area 1041.

[0096] Specific reference Fig.18 , Fig.19 In order to facilitate processing and installation, the inspection port 131 and the inspection cover 140 are both square structures. The two opposite edges of the inspection port 131 are provided with connecting edges 1311 recessed toward the installation inner cavity. The connecting edges 1311 are used to directly overlap with the inspection cover 140 and are fixed by fasteners.

[0097] Through holes are provided at corresponding positions of the connecting edge 1311 and the maintenance cover, and the maintenance cover is detachably connected to the connecting edge 1311 by fasteners.

[0098] The connecting edge 1311 is formed at least on two opposite edges of the inspection opening 131, and the connecting edge 1311 is integrally formed with the lower cover plate 130. In the installed state, the outer surface of the lower cover plate 130 is flush with the outer surface of the inspection cover plate 140, ensuring that the surface of the fresh air air conditioner is smooth and beautiful.

[0099] Of course, the inspection port 131 and the inspection cover 140 can also be other shapes and are not limited to the square shape mentioned above, as long as the heat exchange core 200 can be removed from the inspection port 131 and connected to the outdoor air inlet area 1011 and the indoor return air area 1041 on both sides of the heat exchange core 200.

[0100] In order to improve the sealing performance of the connection between the inspection cover plate 140 and the inspection opening 131 , a sealing layer is formed on the upper surface of the connection edge 1311 .

[0101] Since the heat exchange core 200 needs to be removed from the inspection port 131 for inspection, in order to prevent the sharp inner edge around the inspection port 131 from scratching the heat exchange core 200 and affecting the service life of the heat exchange core 200, the edge where the inspection port 131 contacts the heat exchange core 200 is provided with an upwardly extending flange 1312, and a protective layer is provided on the side of the flange 1312 close to the inspection port 131, and the protective layer is used to protect the heat exchange core 200 during assembly and disassembly.

[0102] The material of the protective layer is a rubber layer (EPDM layer, etc.) or a flannel layer to reduce damage to the heat exchange core 200 .

[0103] refer to Fig.19 The two side edges corresponding to the inspection cover 140 and the flange 1312 are respectively formed with cover curling edges 141 extending toward the installation inner cavity. In order to prevent the cover curling edges 141 from damaging the protective layer on the flange 1312 during the installation of the inspection cover 140, the ends of each cover curling edge 141 are formed with relatively extended bends, which are flipped inward. Therefore, during the installation of the inspection cover 140, the smooth transition position on the cover curling edge 141 contacts the protective layer, thereby preventing the protective layer from being damaged during the installation of the inspection cover 140.

[0104] In actual installation, there is an installation gap between the inspection cover 140 and the heat exchange core 200 . The installation gap may affect the sealing between the outdoor air inlet area and the indoor air return area on both sides of the heat exchange core 200 .

[0105] In order to solve the above problems, a curling notch 142 is formed on each cover curling 141, and a core sealing portion 150 is also installed between the inspection cover 140 and the heat exchange core 200. The two ends of the core sealing portion 150 extend to the outside of the curling notch 142 respectively to seal the outdoor air inlet area and the indoor return air area.

[0106] refer to Fig. 20 , Fig.21 The heat exchange core 200 is detachably connected and installed in the inner cavity through a supporting assembly. Specifically, its two sides are respectively close to the outdoor air inlet area 1011 and the indoor return air area 1041. The two ends of the heat exchange core 200 are respectively connected to the inner wall of the outer shell 100 and the heat exchange bracket 800.

[0107] The heat exchange bracket 800 is used to fix the exhaust heat exchanger 400 and the intake heat exchanger 300 . The heat exchange bracket 800 runs through the entire installation cavity, and its two ends are respectively connected to the peripheral side plates 120 at the two ends of the outer shell 100 .

[0108] Define the extension direction of the heat exchange bracket 800 as the first direction, then, the support assembly includes a fixed support member 230 and a movable support member 240 relatively arranged along the first direction, the fixed support member 230 and the movable support member 240 are arranged in parallel, and support positions 201 are formed on the fixed support member 230 and the movable support member 240, and both sides of the heat exchange core 200 extend into the support position 201 respectively, and the shape of the support position 201 is adapted to the shape of both sides of the heat exchange core 200.

[0109] In some embodiments of the present application, tapered edges are formed on both sides of the heat exchange core 200, and the corresponding support positions 201 are also opening structures that gradually expand toward the heat exchange core 200. The two sides of the heat exchange core 200 are inserted into the support positions 201 to fix the entire heat exchange core 200.

[0110] The heat exchange core 200 can be a polygonal prism or other shapes, as long as it can achieve the heat exchange function of vertically placing the characteristic cross-section. In addition, simple chamfering operations based on the polygonal prism are within the scope of this application.

[0111] In order to reduce the size of the maintenance port and facilitate disassembly, in some embodiments of the present application, the heat exchange core 200 is designed to include at least two core units arranged along a direction perpendicular to the first direction, and the end faces of the core units are in direct contact to form a heat exchange core 200 as a whole.

[0112] Therefore, the width of the inspection port 131 along the first direction does not need to be designed to be larger than the length of the heat exchange core 200 in this direction. It only needs to ensure that it is not less than the length of any core unit. During actual disassembly, each core unit is disassembled separately, which is conducive to reducing the size of the inspection port 131, improving the structural strength of the outer shell 100, and reducing the difficulty of disassembly.

[0113] refer to Figure 22-Figure 24 Since the core unit is removed from the bottom to the outside during disassembly, the fixed support member 230 and the movable support member 240 are correspondingly designed into two upper and lower components, that is, the fixed support member 230 includes an upper fixed bracket 231 and a lower fixed bracket 232, and the movable support member 240 includes an upper movable bracket 241 and a lower movable bracket.

[0114] The upper fixing bracket 231 and the lower fixing bracket 232 are spliced ​​up and down, the upper fixing bracket 231 is formed with an upper flange 270 inclined upward, and the lower fixing bracket 232 is formed with a lower flange 260 inclined downward, and a gradually expanding support position 201 is formed between the upper flange 270 and the lower flange 260.

[0115] An upper flange 270 inclined upward is formed on the upper movable bracket 241 , and a lower flange 260 inclined downward is formed on the lower movable bracket. The support position 201 on the movable support member 240 is located between the upper flange 270 and the lower flange 260 .

[0116] The movable support member 240 needs to be partially dismantled during the actual maintenance process. Specifically, the lower movable bracket is partially dismantled to enable the core unit to be moved downward out of the installation cavity.

[0117] The lower movable bracket includes a detachable bracket 243 and a lower support frame 242. The length of the detachable bracket 243 is not less than the length of any core unit. During maintenance, the detachable bracket 243 is removed from the upper fixed bracket 231. After being taken out from the maintenance port, each core unit can be removed one by one from the assembly and disassembly position formed after the detachable bracket 243 is removed.

[0118] During the actual operation of the fresh air air conditioner, many working parts, such as the electrical box, need to be connected to many wire harnesses. In order to facilitate the connection of the wire harnesses, a through wiring hole 250 is formed on the movable support 240 and / or the fixed support 230, and the wire harness passes up and down through the wiring hole 250. Furthermore, a sealing plug may be provided in the wiring hole 250, and a through wiring channel is formed on the sealing plug. The sealing plug is made of rubber material and has a certain sealing elasticity. Therefore, the wire harness can pass through the wire harness channel while ensuring the sealing of the surrounding side of the wire harness.

[0119] Wire clamps are also arranged on the fixed support member 230 and the movable support member 240. The wire clamps can fix the passing wire harness by means of snap connection or winding fixation, thereby improving the neatness of the wire harness connection.

[0120] The detachable bracket 243 is located at the end away from the heat exchange bracket 800, that is, the end close to the peripheral side plate 120. Taking the heat exchange core 200 including the first core unit 210 and the second core unit 220 as an example, in the actual disassembly process, after the detachable bracket 243 is disassembled, the first core unit 210 away from the heat exchange bracket 800 is first removed from the inspection port 131, and then, the second core unit 220 close to the heat exchange bracket 800 moves outward along the support position 201 to the corresponding position of the first core unit 210, and then is removed from the inspection port 131.

[0121] In this embodiment, according to the actual loading and unloading position of the heat exchange core 200 , the position of the flange 1312 and the position of the protective layer can be set on a side parallel to the heat exchange bracket 800 and away from the inspection port 131 of the heat exchange bracket 800 .

[0122] After the heat exchange core 200 is disassembled, the operator can directly inspect the working parts such as the air valve assembly, the electrical box, etc. in the indoor return air area 1041 and the outdoor air inlet area 1011 located beside the heat exchange core 200 through the inspection port 131.

[0123] like Fig.25 The heat exchange bracket 800 that passes through the installation cavity is used to fix the air inlet heat exchanger 300 and the exhaust heat exchanger 400. The air inlet heat exchanger 300 and the exhaust heat exchanger 400 are pre-fixed on one side of the heat exchange bracket 800, and the movable support member 240 and the fixed support member 230 are fixed on the other side of the heat exchange bracket 800.

[0124] In some embodiments of the present application, an internal inspection port is formed on the heat exchange bracket 800, and the internal inspection port is located between the exhaust heat exchanger 400 and the inlet heat exchanger 300. When the heat exchange core 200 is removed from the inspection port 131, maintenance personnel can also inspect the working parts located on the other side of the heat exchange bracket 800 through the internal inspection port.

[0125] Specifically, a compressor 500 is installed between the exhaust heat exchanger 400 and the inlet heat exchanger 300 , and the compressor 500 can be inspected and maintained through the internal inspection port. Therefore, the inspection position for inspecting the compressor 500 can be omitted on the lower cover plate 130 .

[0126] Specifically, the inner inspection opening is detachably connected to an inner inspection cover plate 810 , and similar to the lower cover plate 130 , the inner inspection opening and the inner inspection cover plate 810 are detachably connected via fasteners.

[0127] In order to facilitate the operator to disassemble the inner inspection plate, a handle portion bent toward the heat exchange core 200 is formed on the inner inspection plate. When disassembling the inner inspection plate, the operator removes the inner inspection plate through the handle portion.

[0128] A threading portion is formed on the inner inspection cover plate 810, and the threading portion is a threading virtual portion 811 or a threading hole, and a sealing plug is provided on the threading hole.

[0129] Similar to the sealing plug in the wiring hole 250, the sealing plug on the threading portion also forms a threading channel that penetrates through. The sealing plug is made of rubber material and has a certain sealing elasticity. Therefore, the wiring harness can pass through the wiring harness channel while ensuring the sealing of the surrounding side of the wiring harness.

[0130] When the threading part is the virtual threading part 811, the virtual threading part 811 can be knocked down during maintenance, and the wire harness after maintenance can be passed through this position. The virtual threading part 811 after being knocked down also forms a threading hole structure. In the actual maintenance process, a sealing plug is also configured for it to improve the sealing of the threading part after the wire harness passes through.

[0131] refer to Fig.26Since many working components in the fresh air air conditioner require external wiring harnesses to provide them with signal or power transmission, in order to standardize the layout of the wiring harnesses, in some embodiments of the present application, a bridge assembly 280 for the wiring harness to pass through is also provided between the upper cover plate 110 and the heat exchange core 200.

[0132] Part of the wiring harness in the installation cavity passes through the bridge assembly 280 and is connected to the outside world.

[0133] Both ends of the bridge assembly 280 are connected to the outer shell 100 and the heat exchange bracket 800 respectively. A threading channel is formed on the bridge assembly 280, and the wire harness passes through the threading channel and is connected to the corresponding working component in the installation cavity.

[0134] refer to Fig. 27 , Fig.28 Specifically, the bridge assembly 280 includes a detachably connected wire trough support plate 281 and a wire trough cover plate 282, a wire threading channel is formed between the wire trough support plate 281 and the wire trough cover plate 282, and a plurality of wire clips are dispersedly formed in the wire threading channel for fixing the wire harness.

[0135] Since the wire trough support plate 281 located on the lower side needs to be removed during the maintenance process, in order to facilitate disassembly and maintenance and prevent the wiring harness from falling after the wire trough support plate 281 is removed, an intermediate bridge frame 283 is also arranged between the wire trough support plate 281 and the wire trough cover plate 282, and the connection between the bridge frame assembly 280 and the outer shell 100 and the heat exchange bracket 800 is realized through the intermediate bridge frame 283.

[0136] The intermediate bridge 283 includes a bottom plate 2831 in contact with the wire trough support plate 281 and a plurality of vertical plates 2832 formed on both sides of the bottom plate 2831. Notches are formed between adjacent vertical plates 2832 to facilitate the connection of the wire harness from the corresponding notches.

[0137] Two ends of the bottom plate 2831 that are in contact with the outer shell 100 and the heat exchange bracket 800 are respectively formed with connecting flanges 2833 , and the connecting flanges 2833 are detachably connected to the outer shell 100 and the heat exchange bracket 800 by fasteners.

[0138] A plurality of maintenance openings are dispersedly formed on the bottom plate 2831, so that operators can conveniently inspect and repair the wiring harness from below the maintenance openings.

[0139] The wire trough support plate 281 is clamped under the middle bridge frame 283 . Specifically, a plurality of downwardly-extending downwardly-flipping plates 2811 are formed on the wire trough support plate 281 . The downwardly-flipping plates 2811 are clamped on the outer sides of the vertical plates 2832 of the middle bridge frame 283 .

[0140] The wire trough cover 282 is formed with multiple upper flaps 2821 extending downward. Similarly, the upper flaps 2821 are respectively clamped on the outer sides of the vertical plates 2832 of the middle bridge frame 283. Then, the height of the vertical plates 2832 is at least greater than the sum of the heights of the upper flaps 2821 and the lower flaps 2811 to avoid interference between the upper flaps 2821 and the lower flaps 2811.

[0141] Wiring notches 284 are formed between adjacent lower flaps 2811 , which are similar to the wiring notches 284 on the vertical plate 2832 and are used for wiring harnesses to pass through.

[0142] In other embodiments of the present application, the vertical plate 2832 of the intermediate bridge frame 283 is also detachably connected to the wire trough cover plate 282 by fasteners to improve the stability of the connection. In this embodiment, the lower flap 2811 of the wire trough cover plate 282 can be tightly engaged with the intermediate bridge frame 283, or it can be directly tightly engaged with the upper flap 2821 on the wire trough cover plate 282. At this time, the height of the vertical plate 2832 is less than the sum of the heights of the upper flap 2821 and the lower flap 2811, ensuring that the lower flap 2811 can be engaged on the outside of the upper flap 2821.

[0143] In order to prevent the airflow between the outdoor air inlet area 1011 and the indoor return air area 1041 from passing through the bridge assembly 280, a sealing barrier 285 is provided between the middle bridge 283 and the wire trough cover 282. The sealing barrier 285 extends along the length direction of the middle bridge 283 to separate the outdoor air inlet area 1011 and the indoor return air area 1041, thereby improving the sealing effect.

[0144] During the initial installation, after the heat exchange core 200 is installed, the wire trough support plate 281 is placed on the upper surface of the heat exchange core 200, and then the intermediate bridge 283 is placed on the wire trough support plate 281. The lower flap 2811 beside the wire trough support plate 281 is tightly fitted and clamped on the outside of the intermediate bridge 283. The connecting flanges 2833 at both ends of the intermediate bridge 283 are respectively fixed between the heat exchange and the outer shell 100, and then the wiring harness is connected from the middle of the intermediate bridge 283 to the various working parts of the installation inner cavity. After the wiring is completed, the wire trough cover plate 282 is covered on the intermediate bridge 283, and finally, the upper cover plate 110 is covered on the surface.

[0145] During maintenance, after removing the heat exchange core 200, the operator removes the wire trough support plate 281 that is in direct contact with the heat exchange core 200 from the intermediate bridge 283 through the inspection port 131, and then inspects the corresponding wiring harness from the maintenance port of the intermediate bridge 283. During the maintenance process, since part of the wiring harness has fallen out of the threading channel and is difficult to re-connect, the corresponding part of the wiring harness can be connected from the threading part on the heat exchange bracket 800 to the corresponding working part. After completing the wiring harness inspection, the wire trough support plate 281 can be clamped from the bottom of the intermediate bridge 283.

[0146] The design of the bridge assembly 280 not only makes the wiring harness more orderly, but also facilitates maintenance, greatly improving maintenance efficiency. The wiring harness passes through the threading channel, reducing direct contact with the heat exchange core 200, which is beneficial to insulation, increases service life, and greatly improves safety.

[0147] refer to Fig.29 , Fig.30 The side panel group 120 specifically includes an outdoor end panel 122 , an indoor end panel 121 , a first side panel 124 and a second side panel 123 located between the outdoor end panel 122 and the indoor end panel 121 .

[0148] The outdoor end plate 122 and the indoor end plate 121 are arranged opposite to each other. The outdoor end plate 122 is located on the outdoor side, and the outdoor air inlet 101 and the outdoor air outlet 102 are located on the outdoor end plate 122; the indoor end plate 121 is located on the indoor side, and the indoor air supply outlet 103 and the indoor return air outlet 104 are located on the indoor end plate 121.

[0149] The first side plate 124 is in contact with the end surface of the heat exchange core 200 . In order to improve the overall sealing effect of the outer shell 100 and reduce the installation process, the outdoor end plate 122 , the indoor end plate 121 , and the second side plate 123 are integrally formed with the lower cover plate 130 .

[0150] In some embodiments of the present application, in order to improve the supporting strength of the outer shell 100 for each working component in the installation cavity, a horizontal support frame 1100 and a plurality of vertical frames 1200 are further provided in the installation cavity.

[0151] The horizontal support frame 1100 is a frame structure and can be connected to the inner surface of the lower cover plate 130 by welding.

[0152] The horizontal support frame 1100 is formed by welding or mechanically connecting a plurality of support beams. In order to improve the structural strength, reinforcing trusses may be additionally provided between the support beams. The reinforcing trusses may provide support for the working parts installed in the inner cavity.

[0153] The supporting beams and reinforcing trusses are both made of hollow steel, and their weight is minimized while ensuring structural strength.

[0154] The vertical frame 1200 is arranged on the inner side of the corner of the side plate group 120, and the bottom of the vertical frame 1200 is fixedly connected to the horizontal support frame 1100. For the convenience of processing, the vertical frame 1200 is fixed to the horizontal support frame 1100 by welding, and supports the outer shell 100 together with the horizontal support frame 1100.

[0155] Specifically, there are four frames 1200, which are respectively arranged at the connection between the outdoor end plate 122 and the first side plate 124, the connection between the outdoor end plate 122 and the second side plate 123, the connection between the indoor end plate 121 and the first side plate 124, and the connection between the indoor end plate 121 and the second side plate 123.

[0156] refer to Fig.31 , Fig.32 Each upright frame 1200 specifically includes a first upright wall 1210 and a second upright wall 1220 that are perpendicular to each other. The first upright wall 1210 is in contact with and connected to the indoor end plate 121 or the outdoor end plate 122, and the second upright wall 1220 is in contact with and connected to the first side wall or the second side wall.

[0157] A first overlapping edge 1211 and a second overlapping edge 1221 extending inwardly are respectively formed on the first vertical wall 1210 and the second vertical wall 1220 . The first overlapping edge 1211 and the second overlapping edge 1221 are parallel to the first vertical wall 1210 and the second vertical wall 1220 .

[0158] The inner side of the stand 1200 is detachably connected to a blocking member 1300. For details, refer to Fig.33 The blocking piece 1300 is connected to the first overlapping edge 1211 and the second overlapping edge 1221 to block the inner side of the stand 1200 .

[0159] The blocking member 1300 includes two sealing plates 1310 perpendicular to each other. The two sealing plates 1310 are detachably connected to the first overlapping edge 1211 and the second overlapping edge 1221 respectively by fastening screws.

[0160] The blocking member 1300 and the stand 1200 are formed in one piece by bending sheet metal, which reduces assembly steps, improves work efficiency, and also greatly enhances structural strength.

[0161] refer to Fig.34 Since the fresh air air conditioner is mainly hung on the indoor ceiling by a hanging rope, it is necessary to set a hanging member 1600 on the outer shell 100 for connecting the hanging rope.

[0162] The hanging member 1600 in the present application is located on the outdoor end plate 122 and the indoor end plate 121 , and two hanging members 1600 are respectively provided on the outdoor end plate 122 and the indoor end plate 121 .

[0163] Since the hanging part 1600 needs to bear the weight of the entire fresh air air conditioner, the connection strength requirement for the hanging part 1600 is relatively high.

[0164] In order to ensure the connection stability and connection strength of the hanging member 1600, the hanging bracket part is connected and fixed to the stand 1200 at the corresponding position through the outdoor end plate 122 and the indoor end plate 121.

[0165] At least one penetrating connection portion 1230 is respectively formed on each of the upright frames 1200, the outdoor end plate 122 and the indoor end plate 121. The connection portion 1230 is specifically a through-hole structure. The upright frame 1200 specifically connected to the hanging member 1600 is the first upright frame 1200. A nut 1320 is welded on the inner side of the first upright frame 1200. Structures such as fastening screws pass through the connection portion 1230 and are connected to the nut 1320.

[0166] A plurality of connection parts 1230 and nuts 1320 corresponding to the same hanging member 1600 may be provided to improve the stability of the connection.

[0167] When the nut 1320 needs to be repaired, the blocking member 1300 can be disassembled to repair or replace the nut 1320 .

[0168] The hanging component 1600 specifically includes a fixing plate 151 that is in contact with the outdoor end plate 122 or the indoor end plate 121 and a hanging plate 152 that is perpendicular to the fixing plate 151 . The hanging plate 152 is vertically arranged above the fixing plate 151 and is formed integrally with the fixing plate 151 .

[0169] A hanging notch 153 is formed on the hanging plate 152 for connecting a hanging rope. During installation, the hanging rope is fixed at the connecting notch to hang the entire fresh air air conditioner.

[0170] When the fresh air air conditioner is in operation, the lower cover plate 130 on the outer shell 100 is located below the fresh air air conditioner to facilitate maintenance by operators, and a maintenance opening 131 is provided on the lower cover plate 130 .

[0171] After the lower cover plate 130 and the side panel group 120 of the outer shell 100 are connected, the horizontal support frame 1100 is directly connected and fixed to the lower cover plate 130. Each vertical frame 1200 is located on the inner side of the corner of the side panel group 120, and the bottom is connected and fixed to the horizontal support frame 1100, thereby forming a three-dimensional support frame, which is beneficial to improve the structural strength of the entire outer shell 100. The horizontal support frame 1100 can be connected before installation, which improves the installation efficiency, and the structure is stable, safe and reliable.

[0172] In the actual working process, the working components in the outdoor air inlet area 1011 and the indoor air return area 1041 need to transmit signals and electric energy through wiring harnesses.

[0173] The conventional wiring harness connecting the outdoor air inlet area 1011 and the indoor return air area 1041 mainly passes directly between the heat exchange core 200 and the side plate group 120. This connection method easily leads to gaps around the wiring harness, so that the airflow between the outdoor air inlet area 1011 and the indoor return air area 1041 flows through the gap, affecting the working effect of the air conditioner. Furthermore, the wiring harness is in direct contact with the heat exchange core 200 , and friction will be generated between the wiring harness and the heat exchange core 200 , causing wear between the wiring harness and the heat exchange core 200 , thus affecting the lifespan of the wiring harness and the heat exchange core 200 .

[0174] refer to Fig.34 In some embodiments of the present application, a foam member 1400 is provided between the heat exchange core 200 and the side plate group 120. The foam member 1400 is a foam material having a certain thickness, and has functions such as heat preservation and noise absorption.

[0175] At least one penetrating avoidance portion 1401 is disposed on the foam member 1400 . The avoidance portion 1401 is arranged horizontally or at an angle on the foam member 1400 according to the actual connection direction of the wire harness.

[0176] refer to Fig.35 Each avoidance portion 1401 is correspondingly connected to a wire-passing member 1500 . The wire-passing member 1500 is an integrally formed sheet metal structure, and its cross-sectional shape is similar to a “Z” shape, which is convenient for processing and installation.

[0177] The wire-passing member 1500 specifically includes a wire-passing bottom plate 1510 , and a first contact surface 1511 and a second contact surface 1512 located on both sides of the wire-passing bottom plate 1510 and extending in opposite directions.

[0178] refer to Figure 36-Figure 38 The shape of each wire-passing member 1500 is matched with the shape of the avoidance portion 1401 at the corresponding installation position, and the first contact surface 1511 is connected to the inner wall of the side plate group 120 by welding or mechanical connection such as fastening screws.

[0179] The outer surface of the second contact surface 1512 is flush with the surface of the foaming member 1400, ensuring that the second contact surface 1512 and the outer side of the foaming member 1400 are in the same plane and are both in contact with and connected to the heat exchange core 200, thereby reducing the generation of connection gaps.

[0180] A wire passing channel is formed between the wire passing member 1500 and the side panel group 120 and the foam member 1400. Both ends of the wire passing channel are respectively connected to the outdoor air inlet area 1011 and the indoor return air area 1041 for the wire bundle to pass between the outdoor air inlet area 1011 and the indoor return air area 1041.

[0181] That is, after the first contact surface 1511 of the wire-passing member 1500 is connected to the inner wall of the side plate assembly 120 , each avoidance portion 1401 of the foam member 1400 is aligned with each wire-passing member 1500 .

[0182] The first contact surface 1511 is pressed between the foam part 1400 and the side plate group 120. The wire-passing bottom plate 1510 and the second contact surface 1512 are together with the foam part 1400 and the side plate group 120 to form a wire-passing channel. The wire harness passes through the wire-passing channel to avoid direct contact with the heat exchange core 200.

[0183] In order to further improve the sealing between the outdoor air inlet area 1011 and the indoor air return area 1041, a sealing strip (not shown) is provided in the wire passage.

[0184] The sealing strip can be a structure such as a sealing rubber strip. After the wiring harness passes through the wiring channel, the sealing strip is used to seal other areas in the wiring channel to reduce the airflow between the outdoor air inlet area 1011 and the indoor return air area 1041, thereby improving the sealing effect.

[0185] In addition to protecting the heat exchange core 200 and providing thermal insulation, the foam part 1400 can also provide space for the connection of the wiring harness, thereby preventing the wiring harness from passing directly from the side of the heat exchange core 200 and causing poor sealing between the outdoor air inlet area 1011 and the indoor return air area 1041, and preventing the wiring harness from being directly connected to the side of the heat exchange core 200 and direct contact with the heat exchange core 200, which helps to reduce safety hazards.

[0186] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0187] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A fresh air air conditioner, characterized in that: include: Total heat exchanger; A refrigerant system, comprising a compressor, a four-way valve and a heat exchanger group connected together by a refrigerant pipeline, wherein the heat exchanger group comprises an exhaust heat exchanger, an inlet heat exchanger and an auxiliary heat exchanger, and a water receiving pan is arranged below the heat exchanger group; an ice melting section is arranged at the bottom of the exhaust heat exchanger, and the ice melting section at least partially extends into the water receiving pan; The exhaust heat exchanger is connected to the first valve port of the four-way valve, one end of the inlet heat exchanger is connected to the second valve port of the four-way valve, the input end of the compressor is connected to the third valve port of the four-way valve, and the output end of the compressor is connected to the fourth valve port of the four-way valve; The other end of the exhaust heat exchanger is connected to the auxiliary heat exchanger through the first refrigerant branch and to the ice melting section through the second refrigerant branch. The other end of the auxiliary heat exchanger is connected to the second refrigerant branch through the first refrigerant auxiliary circuit, and the other end of the ice melting section is connected to the other end of the inlet heat exchanger through the second refrigerant auxiliary circuit. A first expansion valve is provided on the first refrigerant branch, a second expansion valve is provided on the second refrigerant auxiliary circuit, and a switch component is provided on the second refrigerant branch, and the switch component is used to control the on and off of the second refrigerant branch and the flow direction of the refrigerant in the second refrigerant branch.

2. The fresh air air conditioner according to claim 1, characterized in that: In the heating mode, the fourth valve port is connected to the second valve port, the third valve port is connected to the first valve port, the second expansion valve is in a fully open state, the air inlet heat exchanger and the auxiliary heat exchanger serve as condensers, and the exhaust air heat exchanger serves as an evaporator; The refrigerant output from the compressor is input into the air inlet heat exchanger through the four-way valve. The refrigerant output after heat exchange in the air inlet heat exchanger is input into the auxiliary heat exchanger after passing through the second expansion valve and the ice melting section. The ice melting section is used to heat the condensed water in the water tray to prevent the condensed water from freezing. The refrigerant output from the auxiliary heat exchanger is throttled by the first expansion valve and then input back into the compressor through the exhaust heat exchanger.

3. The fresh air air conditioner according to claim 1, characterized in that: In cooling mode, the fourth valve port is connected to the first valve port, the third valve port is connected to the second valve port, the switch is turned on, the auxiliary heat exchanger is bypassed, the air inlet heat exchanger is an evaporator, and the air outlet heat exchanger is a condenser; The refrigerant output from the compressor flows into the exhaust heat exchanger through the four-way valve, and the refrigerant output from the exhaust heat exchanger is directly input into the ice melting section from the second refrigerant branch. The ice melting section is used to cool the condensed water in the exhaust heat exchanger and the water receiving tray. The refrigerant output from the ice melting section is throttled by the second expansion valve, transported to the air inlet heat exchanger for heat exchange, and then input back to the compressor.

4. The fresh air air conditioner according to claim 1, characterized in that: In the non-cooling dehumidification mode, the fourth valve port is connected to the first valve port, the third valve port is connected to the second valve port, the switch is closed, and the first expansion valve is fully opened; the exhaust heat exchanger and the auxiliary heat exchanger serve as condensers, and the inlet heat exchanger serves as an evaporator; The refrigerant output from the compressor flows into the exhaust heat exchanger through the four-way valve, and the refrigerant output from the exhaust heat exchanger is input into the ice melting section through the auxiliary heat exchanger. The ice melting section is used to cool the condensed water in the exhaust heat exchanger and the water receiving tray. The refrigerant output from the ice melting section is throttled by the second expansion valve, and is transported to the air inlet heat exchanger for heat exchange, and then is input back to the compressor.

5. The fresh air air conditioner according to claim 1, characterized in that: The switch component includes a switch valve and a one-way valve, and the one-way valve is used to control the flow of refrigerant from the exhaust air heat exchanger through the switch valve to the ice melting section.

6. The fresh air air conditioner according to claim 1, characterized in that: The total heat exchanger comprises an outer shell and a heat exchange core, an exhaust fan and an air supply fan arranged in the outer shell; the outer shell is formed with an outdoor air inlet, an outdoor air outlet, an indoor air supply outlet and an indoor air return outlet; An air inlet channel is formed between the outdoor air inlet and the indoor air supply port for conveying outdoor fresh air, and an air exhaust channel is formed between the indoor air return port and the outdoor air exhaust port for conveying indoor polluted air; The exhaust heat exchanger and the inlet heat exchanger are longitudinally fixedly connected to the heat exchange bracket, the exhaust heat exchanger is arranged in the exhaust channel, and the inlet heat exchanger and the auxiliary heat exchanger are sequentially formed in the inlet channel along the flow direction of the airflow; An inner inspection port is formed on the heat exchange bracket, and the inner inspection port is located between the exhaust heat exchanger and the inlet heat exchanger. An inner inspection cover plate is detachably connected to the inner inspection port.

7. The fresh air air conditioner according to claim 6, characterized in that: The outer shell includes an installation inner cavity surrounded by an upper cover plate, a lower cover plate and a peripheral side plate located between the upper cover plate and the lower cover plate, and the installation inner cavity includes an outdoor air inlet area connected to the outdoor air inlet, an outdoor air exhaust area connected to the outdoor air exhaust outlet, an indoor air supply area connected to the indoor air supply outlet, and an indoor return air area connected to the indoor return air outlet; the compressor is located between the indoor air supply area and the outdoor air exhaust area, and the heat exchange core is located between the indoor return air area and the outdoor air inlet area; The lower cover plate is provided with an inspection port, to which an inspection cover plate is detachably connected. The inspection port is located directly below the heat exchange core and is connected to the indoor return air area and the outdoor air inlet area on both sides of the heat exchange core.

8. The fresh air air conditioner according to claim 7, characterized in that: The heat exchange core is detachably connected to the installation inner cavity through a support assembly, and the support assembly includes a fixed support member and a movable support member arranged relatively along a first direction, and support positions are formed on both the fixed support member and the movable support member, and both sides of the heat exchange core extend into the support positions respectively; The heat exchange core comprises at least two core units arranged perpendicular to the first direction, the support position is an opening structure gradually expanding toward the core unit, and two opposite edges of each core unit are respectively supported in the support positions on the fixed support member and the movable support member; The fixed support member includes an upper fixed bracket and a lower fixed bracket, the upper fixed bracket is formed with an upper flange inclined upward, the lower fixed bracket is formed with a lower flange inclined downward, and the support position is located between the upper flange and the lower flange.

9. The fresh air air conditioner according to claim 8, characterized in that: The movable support member includes an upper movable bracket and a lower movable bracket, the lower movable bracket includes a detachable bracket and a lower support bracket, the length of the detachable bracket is not less than the length of any of the core units; an upper flange inclined upward is formed on the upper movable bracket, and a lower flange inclined downward is formed on the lower movable bracket, and the support position is located between the upper flange and the lower flange.

10. The fresh air air conditioner according to claim 1, characterized in that: The water receiving pan is located below the heat exchanger group, and includes a first water receiving area and a second water receiving area. The first water receiving area is located below the air inlet heat exchanger, and the bottom height of the first water receiving area is higher than the bottom height of the second water receiving area. A seal is also provided between the air inlet heat exchanger and the water receiving pan, and a drainage channel is formed on the seal for draining condensed water in the first water receiving area into the second water receiving area.

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