Fresh air system and operation method

Abstract

The present invention relates to a fresh air system and an operation method. The fresh air system includes a shell, a heat exchange core and a control unit are arranged in the shell, and an outdoor air inlet, an indoor air inlet, an indoor air outlet and an outdoor air outlet are arranged on the shell; the fresh air system has a first working mode; the control unit is configured to put the fresh air system in the first working mode, so that after the air at the indoor air outlet passes through the heat exchange core, a part of the air is discharged to the outdoors through the outdoor air outlet, and the other part of the air is mixed with the air at the outdoor air inlet and passes through the heat exchange core, and then enters the indoor through the indoor air inlet. After the indoor air flows through the heat exchange core, a part of the air is mixed with the fresh air introduced from the outdoor air inlet, which can increase the temperature of the fresh air, and the mixed air passes through the heat exchange core again, which can improve the heat exchange efficiency of the heat exchange core, reduce heat loss, and prevent condensation, and at the same time, the humidity and heat in the heat exchange core are blown into the indoor, improving the indoor comfort.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning, and in particular to a fresh air system and an operating method thereof. Background Art

[0002] For fresh air fans with full heat exchange function, the full heat exchange function is realized by the full heat exchange core inside the fresh air fan. The quality of the full heat exchange core determines the exchange efficiency and service life of the fresh air fan. When the temperature difference between indoor and outdoor is large, condensation and more serious frosting will occur in the fresh air channel and exhaust channel of the fresh air fan, preventing the full heat exchange core from performing full heat exchange and affecting the use of the fresh air fan. Summary of the invention

[0003] Some embodiments of the present invention provide a fresh air system and an operating method for alleviating the condensation problem.

[0004] In one aspect of the present invention, a fresh air system is provided, comprising a housing, a heat exchange core and a control unit are arranged in the housing, and an outdoor air inlet, an indoor air inlet, an indoor air outlet and an outdoor air outlet are arranged on the housing; the fresh air system has a first working mode;

[0005] The control unit is configured to put the fresh air system in the first working mode, so that after the wind from the indoor air outlet passes through the heat exchange core, a part of the wind is discharged to the outside through the outdoor air outlet, and the other part of the wind is mixed with the wind from the outdoor air inlet, passes through the heat exchange core, and then enters the room through the indoor air inlet.

[0006] In some embodiments, a first chamber, a second chamber, a third chamber and a fourth chamber are formed in the shell, and the control unit is configured to put the fresh air system into the first working mode, so that the wind from the indoor air outlet first enters the fourth chamber, and then enters the second chamber after passing through the heat exchange core, and then part of the wind is discharged to the outside through the outdoor air outlet, and the other part of the wind enters the first chamber, mixes with the wind entering the first chamber through the outdoor air inlet, and then passes through the heat exchange core to enter the third chamber, and finally enters the room from the third chamber through the indoor air inlet.

[0007] In some embodiments, the control unit includes at least one of a first valve and a second valve, the first valve is arranged at the outdoor air inlet and is configured to adjust the opening of the outdoor air inlet; the second valve is arranged at the outdoor air outlet and is configured to adjust the opening of the outdoor air outlet.

[0008] In some embodiments, the control unit further includes a third valve, the first chamber is adjacent to the second chamber, the third valve is disposed at the connection between the first chamber and the second chamber, and is configured to adjust the on-off between the first chamber and the second chamber.

[0009] In some embodiments, the fresh air system also has a second working mode, and the control unit is configured to put the fresh air system in the second working mode so that the wind from the outdoor air inlet passes through the heat exchange core and is discharged to the outside through the outdoor air outlet.

[0010] In some embodiments, a first chamber, a second chamber, and a third chamber are formed in the shell, and the control unit is configured to put the fresh air system into the second working mode, so that the wind from the outdoor air inlet first enters the first chamber, then passes through the heat exchange core into the third chamber, then enters the second chamber through the third chamber, and finally is discharged from the second chamber to the outside through the outdoor air outlet.

[0011] In some embodiments, the control unit includes a fourth valve, which is arranged at the indoor air inlet. The fourth valve is configured to connect the third chamber with the indoor air in an open state, and to disconnect the third chamber from the indoor air in a closed state. The fourth valve is configured to be in a closed state in the second working mode.

[0012] In some embodiments, the control unit further includes a fifth valve, the second chamber is adjacent to the third chamber, the fifth valve is disposed at the connection between the second chamber and the third chamber, and is configured to adjust the connection between the third chamber and the second chamber.

[0013] In some embodiments, the fresh air system also has a third working mode, and the control unit is configured to put the fresh air system in the third working mode so that the wind from the indoor air outlet passes through the heat exchange core and then enters the room through the indoor air inlet.

[0014] In some embodiments, a first cavity, a second cavity, a third cavity and a fourth cavity are formed in the housing, and the third working mode includes a first state and a second state;

[0015] The control unit is configured to put the fresh air system in the first state of the third working mode, so that the wind from the indoor air outlet enters the fourth chamber, enters the first chamber from the fourth chamber, enters the third chamber from the first chamber through the heat exchange core, and finally enters the room from the third chamber through the indoor air inlet;

[0016] The control unit is also configured to put the fresh air system into the second state of the third working mode, so that the wind from the indoor air outlet enters the fourth chamber, enters the second chamber from the fourth chamber after passing through the heat exchange core, enters the third chamber from the second chamber, and finally enters the room from the third chamber through the indoor air inlet.

[0017] In some embodiments, the control unit also includes a first valve and a second valve, the first valve is arranged at the outdoor air inlet and is configured to adjust the opening of the outdoor air inlet; the second valve is arranged at the outdoor air outlet and is configured to adjust the opening of the outdoor air outlet; the first valve and the second valve are configured to be closed in the third working mode.

[0018] In some embodiments, the control unit also includes a fifth valve and a sixth valve, the second chamber is adjacent to the third chamber, the fifth valve is arranged at the connection between the second chamber and the third chamber, and is configured to adjust the connection between the third chamber and the second chamber; the fourth chamber is adjacent to the first chamber, the sixth valve is arranged at the connection between the fourth chamber and the first chamber, and is configured to adjust the connection between the fourth chamber and the first chamber.

[0019] In another aspect of the present invention, a method for operating the above-mentioned fresh air system is provided, comprising:

[0020] A fresh air system is provided, comprising a shell, a heat exchange core and a control unit are arranged in the shell, and an outdoor air inlet, an indoor air inlet, an indoor air outlet and an outdoor air outlet are arranged on the shell; the fresh air system has a first working mode;

[0021] The control unit is used to put the fresh air system into the first working mode. After the air from the indoor air outlet passes through the heat exchange core, part of the air is discharged to the outside through the outdoor air outlet, and the other part of the air is mixed with the air from the outdoor air inlet, passes through the heat exchange core, and then enters the room through the indoor air inlet.

[0022] In some embodiments, the fresh air system further includes a second working mode;

[0023] The control unit is used to place the fresh air system in the second working mode, and the wind from the outdoor air inlet passes through the heat exchange core and is discharged to the outside through the outdoor air outlet.

[0024] In some embodiments, the fresh air system further includes a third working mode;

[0025] The control unit is used to place the fresh air system in the third working mode, and the wind from the indoor air outlet passes through the heat exchange core and then enters the room through the indoor air inlet.

[0026] In some embodiments, a first cavity, a second cavity, a third cavity and a fourth cavity are formed in the housing, and the third working mode includes a first state and a second state;

[0027] First, the control unit is used to put the fresh air system into the first state of the third working mode, and the air from the indoor air outlet enters the fourth chamber, enters the first chamber from the fourth chamber, enters the third chamber from the first chamber through the heat exchange core, and finally enters the room from the third chamber through the indoor air inlet;

[0028] Then, the control unit is used to put the fresh air system into the second state of the third working mode, and the wind from the indoor air outlet enters the fourth chamber, enters the second chamber from the fourth chamber after passing through the heat exchange core, enters the third chamber from the second chamber, and finally enters the room from the third chamber through the indoor air inlet.

[0029] Based on the above technical solution, the present invention has at least the following beneficial effects:

[0030] In some embodiments, the indoor air is drawn out through the indoor air outlet, and after flowing through the heat exchange core, a part of the wind is mixed with the fresh air introduced through the outdoor air inlet, which can increase the temperature of the fresh air, and the mixed air passes through the heat exchange core again. The heat exchange core is reused, which can improve the heat exchange efficiency of the heat exchange core, reduce heat loss, and prevent condensation. At the same time, the humidity and heat in the heat exchange core are blown into the room, indirectly increasing the indoor temperature and humidity, which is beneficial to indoor warming and humidity increase, and improving indoor comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 A schematic diagram of the structure of a fresh air system provided according to some embodiments of the present invention;

[0033] Figure 2 A schematic diagram of a first working mode of a fresh air system provided according to some embodiments of the present invention;

[0034] Figure 3 A schematic diagram of a second working mode of a fresh air system provided according to some embodiments of the present invention;

[0035] Figure 4a A schematic diagram of a first state of a third working mode of a fresh air system provided according to some embodiments of the present invention;

[0036] Figure 4b A schematic diagram of a second state of a third working mode of a fresh air system provided according to some embodiments of the present invention;

[0037] Figure 5 A schematic diagram of a flow chart of selecting a working mode for a fresh air system provided according to some embodiments of the present invention;

[0038] Figure 6 A simplified structural block diagram of a fresh air system provided according to some embodiments of the present invention.

[0039] The reference numerals in the accompanying drawings are described as follows:

[0040] 1-Heat exchange core;

[0041] 21-outdoor air inlet; 22-indoor air inlet;

[0042] 31-Indoor air outlet; 32-Outdoor air outlet;

[0043] 41-first cavity; 42-second cavity; 43-third cavity; 44-fourth cavity;

[0044] 51 - first valve; 52 - second valve; 53 - third valve; 54 - fourth valve; 55 - fifth valve; 56 - sixth valve;

[0045] 61 - first temperature sensor; 62 - second temperature sensor; 63 - third temperature sensor;

[0046] 71-first fan; 72-second fan;

[0047] 100-housing; 200-control unit.

[0048] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0049] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limitations.

[0050] The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0051] In the present invention, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0052] All terms (including technical terms or scientific terms) used in the present invention have the same meanings as those understood by ordinary technicians in the field to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0053] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0054] like Figure 1 and Figure 6 As shown, some embodiments provide a fresh air system, which includes a shell 100, in which a heat exchange core 1 and a control unit 200 are arranged, and the shell 100 is provided with an outdoor air inlet 21, an indoor air inlet 22, an indoor air outlet 31 and an outdoor air outlet 32; the fresh air system has a first working mode.

[0055] The control unit 200 is configured to put the fresh air system in a first working mode, so that after the air from the indoor air outlet 31 passes through the heat exchange core 1, part of the air is discharged to the outside through the outdoor air outlet 32, and the other part of the air is mixed with the air from the outdoor air inlet 21, passes through the heat exchange core 1, and then enters the room through the indoor air inlet 22.

[0056] The fresh air system includes a normal full heat exchange mode. When the fresh air system is in the normal full heat exchange mode, the fresh air introduced by the outdoor air inlet 21 passes through the heat exchange core 1 and enters the room through the indoor air inlet 22. At the same time, the indoor air is led out through the indoor air outlet 31, passes through the heat exchange core 1, and is discharged to the outside through the outdoor air outlet 32.

[0057] In winter, the outdoor temperature is low, the indoor temperature is high, and the temperature difference is large. Condensation of the heat exchange core 1 generally occurs in the exhaust duct (the second chamber 42). In this case, the control unit 200 is used to put the fresh air system in the first working mode: outdoor fresh air is introduced through the outdoor air inlet 21, flows through the heat exchange core 1, and enters the room through the indoor air inlet 22. The indoor air is led out through the indoor air outlet 31. After flowing through the heat exchange core 1, part of the wind is discharged to the outside through the outdoor air outlet 32, and the other part of the wind is mixed with the fresh air introduced through the outdoor air inlet 21, passes through the heat exchange core 1, and then enters the room through the indoor air inlet 22.

[0058] The indoor wind is led out through the indoor air outlet 31, and after flowing through the heat exchange core 1, a part of the wind is mixed with the fresh air introduced by the outdoor air inlet 21, which can increase the temperature of the fresh air, and the mixed wind passes through the heat exchange core 1 again. The heat exchange core 1 is reused, which can improve the heat exchange efficiency of the heat exchange core 1, reduce heat loss, and prevent condensation. At the same time, the humidity and heat in the heat exchange core 1 are blown into the room, indirectly increasing the indoor temperature and humidity, which is beneficial to indoor heating and humidity increase, and improving indoor comfort.

[0059] Furthermore, in the first working mode, the indoor exhaust air will mix with the outdoor fresh air, which can increase the heat entering the heat exchange core 1. For example, the lowest outdoor temperature that the heat exchange core 1 can withstand is -5°C. When in the first working mode, the indoor exhaust air will mix with the outdoor fresh air, so the outdoor temperature that the heat exchange core 1 can withstand can reach -10°C, which indirectly increases the antifreeze performance of the heat exchange core 1.

[0060] like Figure 2 As shown, in some embodiments, a first cavity 41, a second cavity 42, a third cavity 43 and a fourth cavity 44 are formed in the shell 100, and the control unit 200 is configured to put the fresh air system in a first working mode, so that the wind from the indoor air outlet 31 first enters the fourth cavity 44, and then enters the second cavity 42 after passing through the heat exchange core 1, and then part of the wind is discharged to the outside through the outdoor air outlet 32, and the other part of the wind enters the first cavity 41, mixes with the wind entering the first cavity 41 through the outdoor air inlet 21, and then passes through the heat exchange core 1 into the third cavity 43, and finally enters the room from the third cavity 43 through the indoor air inlet 22.

[0061] The outdoor air inlet 21 is located in the first cavity 41 , the outdoor air outlet 32 ​​is located in the second cavity 42 , the indoor air inlet 22 is located in the third cavity 43 , and the indoor air outlet 31 is located in the fourth cavity 44 .

[0062] In some embodiments, the control unit 200 includes at least one of a first valve 51 and a second valve 52, the first valve 51 is arranged at the outdoor air inlet 21, and is configured to adjust the opening of the outdoor air inlet 21; the second valve 52 is arranged at the outdoor air outlet 32, and is configured to adjust the opening of the outdoor air outlet 32.

[0063] Since the fresh air system is in the first working mode, it involves the mixing of indoor exhaust air and outdoor fresh air. A first valve 51 is set at the outdoor air inlet 21, and the opening of the outdoor air inlet 21 is adjusted by the first valve 51; a second valve 52 is set at the outdoor air outlet 32, and the opening of the outdoor air outlet 32 ​​is adjusted by the second valve 52. The opening ratio of the first valve 51 and the second valve 52 is related to the opening of the outdoor air inlet 21 and the outdoor air outlet 32, that is, it is related to the mixing ratio of indoor exhaust air and introduced fresh air. Therefore, the opening ratio of the first valve 51 and the second valve 52 can be dynamically adjusted. For example, when the indoor and outdoor temperature difference is large, when the mixed air temperature is close to the outdoor temperature, the closing ratio of the first valve 51 and the second valve 52 is larger to reduce the intake of outdoor air.

[0064] In some embodiments, the control unit 200 further includes a third valve 53 . The first chamber 41 is adjacent to the second chamber 42 . The third valve 53 is disposed at the connection between the first chamber 41 and the second chamber 42 . The third valve 53 is configured to adjust the connection between the first chamber 41 and the second chamber 42 .

[0065] like Figure 3 As shown, in some embodiments, the fresh air system also has a second working mode, and the control unit 200 is configured to put the fresh air system in the second working mode so that the wind from the outdoor air inlet 21 passes through the heat exchange core 1 and is discharged to the outside through the outdoor air outlet 32.

[0066] In summer, the outdoor temperature is high, and the indoor temperature is low due to air conditioning. The heat exchange core 1 will condense in the fresh air channel (third chamber 43). For this working condition, it can be improved by turning on the second working mode of the fresh air system, and introducing high-temperature fresh air through the outdoor air inlet 21. The fresh air passes through the heat exchange core 1 and dries the heat exchange core 1, effectively avoiding the condensation problem of the heat exchange core 1 and increasing the service life of the heat exchange core 1.

[0067] In some embodiments, a first chamber 41, a second chamber 42 and a third chamber 43 are formed in the shell 100, and the control unit 200 is configured to put the fresh air system in a second working mode, so that the wind from the outdoor air inlet 21 first enters the first chamber 41, then passes through the heat exchange core 1 into the third chamber 43, and then enters the second chamber 42 through the third chamber 43, and finally is discharged from the second chamber 42 to the outside through the outdoor air outlet 32.

[0068] In some embodiments, the control unit 200 includes a fourth valve 54, which is disposed at the indoor air inlet 22. The fourth valve 54 is configured to connect the third chamber 43 with the indoor air in an open state, and to disconnect the third chamber 43 from the indoor air in a closed state. The fourth valve 54 is configured to be in a closed state in the second working mode.

[0069] In some embodiments, the control unit 200 further includes a fifth valve 55 . The second chamber 42 is adjacent to the third chamber 43 . The fifth valve 55 is disposed at the connection between the second chamber 42 and the third chamber 43 . The fifth valve 55 is configured to adjust the connection between the third chamber 43 and the second chamber 42 .

[0070] like Figure 4a and Figure 4b As shown, in some embodiments, the fresh air system also has a third working mode, and the control unit 200 is configured to put the fresh air system in the third working mode so that the wind from the indoor air outlet 31 passes through the heat exchange core 1 and then enters the room through the indoor air inlet 22.

[0071] In extreme winter weather, the outdoor temperature is too low and the indoor temperature is high, and the heat exchange core 1 may freeze. At this time, the exhaust passage (second chamber 42) may be frozen, and the heat exchange core 1 cannot achieve full heat exchange.

[0072] In this case, the control unit 200 is used to put the fresh air system in the third working mode. The indoor hot air flows through the heat exchange core 1, and then enters the room through the indoor air inlet 22. The heat exchange core 1 and the exhaust channel are thawed by the action of the indoor hot air.

[0073] In some embodiments, a first cavity 41 , a second cavity 42 , a third cavity 43 , and a fourth cavity 44 are formed in the housing 100 , and the third working mode includes a first state and a second state.

[0074] like Figure 4a As shown, the control unit 200 is configured to put the fresh air system into the first state of the third working mode, so that the wind from the indoor air outlet 31 enters the fourth chamber 44, enters the first chamber 41 from the fourth chamber 44, enters the third chamber 43 from the first chamber 41 through the heat exchange core 1, and finally enters the room from the third chamber 43 through the indoor air inlet 22.

[0075] like Figure 4b As shown, the control unit 200 is also configured to put the fresh air system into the second state of the third working mode, so that the wind from the indoor air outlet 31 enters the fourth chamber 44, enters the second chamber 42 from the fourth chamber 44 through the heat exchange core 1, enters the third chamber 43 from the second chamber 42, and finally enters the room from the third chamber 43 through the indoor air inlet 22.

[0076] like Figure 4a As shown, the control unit 200 is used to put the fresh air system in the first state of the third working mode. The hot air in the room comes to the fresh air channel (third chamber 43) of the heat exchange core 1. The hot air flows through the heat exchange core 1 and then enters the room through the indoor air inlet 22. Through the heat action of the fresh air channel and the material properties of the heat exchange core 1, the exhaust channel (second chamber 42) can be thawed. When the heat exchange core 1 is thawed, as shown in FIG. Figure 4b As shown, the control unit 200 is used to put the fresh air system in the second state of the third working mode, the exhaust duct (second chamber 42) can be used, the heat exchange core 1 changes from an ice state to a condensation state, the wind from the indoor air outlet 31 enters the fourth chamber 44, from the fourth chamber 44 through the heat exchange core 1 into the second chamber 42, from the second chamber 42 into the third chamber 43, and finally from the third chamber 43 into the room through the indoor air inlet 22, the indoor wind can blow the humidity and heat in the heat exchange core 1 and the exhaust duct (second chamber 42) into the room, the indoor temperature is indirectly raised, and the core condensation problem can also be solved.

[0077] Therefore, in winter, the fresh air system is in the third working mode, which can increase the indoor relative humidity and help keep the indoor warm.

[0078] In some embodiments, the control unit 200 also includes a first valve 51 and a second valve 52. The first valve 51 is arranged at the outdoor air inlet 21 and is configured to adjust the opening of the outdoor air inlet 21; the second valve 52 is arranged at the outdoor air outlet 32 ​​and is configured to adjust the opening of the outdoor air outlet 32; the first valve 51 and the second valve 52 are configured to be closed in the third working mode.

[0079] In some embodiments, the control unit 200 also includes a fifth valve 55 and a sixth valve 56. The second chamber 42 is adjacent to the third chamber 43. The fifth valve 55 is disposed at the connection between the second chamber 42 and the third chamber 43, and is configured to adjust the connection between the third chamber 43 and the second chamber 42. The fourth chamber 44 is adjacent to the first chamber 41. The sixth valve 56 is disposed at the connection between the fourth chamber 44 and the first chamber 41, and is configured to adjust the connection between the fourth chamber 44 and the first chamber 41.

[0080] In some embodiments, the control unit 200 further includes a first temperature sensor 61 , a second temperature sensor 62 , and a third temperature sensor 63 .

[0081] The first temperature sensor 61 is used to measure the temperature of the first cavity 41 , the second temperature sensor 62 is used to measure the temperature of the fourth cavity 44 , and the third temperature sensor 63 is used to measure the temperature of the third cavity 43 .

[0082] In some embodiments, the control unit 200 further includes a first fan 71 and a second fan 72. The first fan 71 is disposed in the third chamber 43 and is used to introduce fresh air. The second fan 72 is disposed in the second chamber 42 and is used to exhaust indoor air.

[0083] In some embodiments, the control unit 200 also includes a controller and the like.

[0084] Combine the following Figures 1 to 6 , some specific embodiments of the fresh air system are described in detail.

[0085] like Figure 1 and Figure 6 As shown, in some specific embodiments, the fresh air system includes a housing 100, and a heat exchange core 1 and a control unit 200 are arranged in the housing 100. The housing 100 is provided with an outdoor air inlet 21, an indoor air inlet 22, an indoor air outlet 31 and an outdoor air outlet 32, and a first cavity 41, a second cavity 42, a third cavity 43 and a fourth cavity 44 are formed in the housing 100. The control unit 200 includes a first valve 51, a second valve 52, a third valve 53, a fourth valve 54, a fifth valve 55 and a sixth valve 56, and also includes a first fan 71 and a second fan 72, and a first temperature sensor 61, a second temperature sensor 62 and a third temperature sensor 63.

[0086] The outdoor air inlet 21 is provided in the first cavity 41. A first valve 51 is provided at the outdoor air inlet 21, and the first valve 51 is used to control the opening and closing of the outdoor air inlet 21, and to adjust the opening of the outdoor air inlet 21. When the first valve 51 is opened, outdoor fresh air can enter the first cavity 41, and when the first valve 51 is closed, outdoor fresh air cannot enter the first cavity 41. The opening of the outdoor air inlet 21 can be adjusted by the first valve 51 to adjust the amount of fresh air entering the first cavity 41.

[0087] The outdoor air outlet 32 ​​is provided in the second chamber 42. A second valve 52 is provided at the outdoor air outlet 32, and the second valve 52 is used to control the opening and closing of the outdoor air outlet 32, and to adjust the opening of the outdoor air outlet 32. When the second valve 52 is opened, the wind in the second chamber 42 can be discharged to the outside through the outdoor air outlet 32, and when the second valve 52 is closed, the wind in the second chamber 42 cannot be discharged to the outside through the outdoor air outlet 32. The opening of the outdoor air inlet 21 can be adjusted by the second valve 52 to adjust the amount of wind in the second chamber 42 that can be discharged to the outside through the outdoor air outlet 32.

[0088] The indoor air inlet 22 is provided in the third chamber 43. A fourth valve 54 is provided at the indoor air inlet 22, and the fourth valve 54 is used to control the opening and closing of the indoor air inlet 22, and to adjust the opening of the indoor air inlet 22. When the fourth valve 54 is opened, the wind in the third chamber 43 can enter the room through the indoor air inlet 22, and when the fourth valve 54 is closed, the wind in the third chamber 43 cannot enter the room through the indoor air inlet 22. The opening of the indoor air inlet 22 can be adjusted by the fourth valve 54 to adjust the amount of wind in the third chamber 43 that can enter the room through the indoor air inlet 22.

[0089] The indoor air outlet 31 is provided in the fourth chamber 44. A valve may also be provided at the indoor air outlet 31 to adjust the opening and closing of the indoor air outlet 31 and the opening degree of the indoor air outlet 31. Alternatively, the indoor air outlet 31 may also be set to a normally open state.

[0090] The first chamber 41 is adjacent to the second chamber 42 , and a third valve 53 is disposed between the first chamber 41 and the second chamber 42 . When the third valve 53 is opened, the first chamber 41 and the second chamber 42 are connected. When the third valve 53 is closed, the connection between the first chamber 41 and the second chamber 42 is disconnected.

[0091] The second chamber 42 is adjacent to the third chamber 43 , and a fifth valve 55 is disposed between the second chamber 42 and the third chamber 43 . When the fifth valve 55 is opened, the second chamber 42 and the third chamber 43 are connected. When the fifth valve 55 is closed, the connection between the second chamber 42 and the third chamber 43 is disconnected.

[0092] The third cavity 43 is adjacent to the fourth cavity 44, and a valve can be provided between the third cavity 43 and the fourth cavity 44 to adjust the communication between the third cavity 43 and the fourth cavity 44. Alternatively, the third cavity 43 and the fourth cavity 44 remain disconnected from each other.

[0093] The fourth chamber 44 is adjacent to the first chamber 41 , and a sixth valve 56 is provided between the fourth chamber 44 and the first chamber 41 . When the sixth valve 56 is opened, the fourth chamber 44 is connected to the first chamber 41 . When the sixth valve 56 is closed, the connection between the fourth chamber 44 and the first chamber 41 is disconnected.

[0094] A first temperature sensor 61 is provided in the first cavity 41, and the first temperature sensor 61 is used to measure the temperature of the first cavity 41. A second temperature sensor 62 is provided in the fourth cavity 44, and the second temperature sensor 62 is used to measure the temperature of the fourth cavity 44. A third temperature sensor 63 is provided in the third cavity 43, and the third temperature sensor 63 is used to measure the temperature of the third cavity 43.

[0095] A first fan 71 is disposed in the third chamber 43. A second fan 72 is disposed in the second chamber 42.

[0096] The fresh air system includes a normal full heat exchange mode, a first working mode, a second working mode and a third working mode.

[0097] When the fresh air system is in the normal full heat exchange mode: the first valve 51, the second valve 52, and the fourth valve 54 are opened, and the third valve 53, the fifth valve 55, and the sixth valve 56 are closed.

[0098] Outdoor fresh air enters the first chamber 41 through the outdoor air inlet 21, passes through the heat exchange core 1, enters the third chamber 43, and enters the room through the indoor air inlet 22; at the same time, indoor air enters the fourth chamber 44 through the indoor air outlet 31, enters the second chamber 42 through the heat exchange core 1, and is discharged to the outside through the outdoor air outlet 32.

[0099] like Figure 2 As shown, in the first working mode of the fresh air system, the first valve 51, the second valve 52, the third valve 53 and the fourth valve 54 are opened, and the fifth valve 55 and the sixth valve 56 are closed. The opening ratio of the first valve 51 and the second valve 52 is adjustable, for example, the first valve 51 and the second valve 52 are both half opened.

[0100] The first fan 71 increases the speed, and the second fan 72 decreases the speed. Outdoor fresh air enters the first chamber 41 through the outdoor air inlet 21, passes through the heat exchange core 1, and under the action of the first fan 71, enters the room through the indoor air inlet 22; at the same time, the indoor air enters the fourth chamber 44 through the indoor air outlet 31, enters the second chamber 42 through the heat exchange core 1, and a part of the air is discharged to the outside through the outdoor air outlet 32, and the other part of the air reaches the first chamber 41 through the third valve 53, and is mixed with the fresh air, and after passing through the heat exchange core 1 again, enters the third chamber 43 and enters the room through the indoor air inlet 22.

[0101] The first working mode is suitable for winter when the outdoor temperature is low and the indoor temperature is high. In winter, the outdoor temperature is low, the indoor temperature is high, and the temperature difference is large. Condensation of the heat exchange core 1 will occur in the exhaust channel (second chamber 42). At this time, the control unit 200 is used to put the fresh air system in the first working mode, and the first valve 51 and the second valve 52 are only partially opened, which can not only meet the requirements of introducing fresh air in winter, but also prevent condensation from occurring in the heat exchange core 1. At the same time, the humidity and temperature in the heat exchange core 1 can be blown into the room, indirectly increasing the indoor temperature and humidity, which is conducive to improving indoor comfort. The heat exchange core 1 is reused for a second time, which can improve the heat exchange efficiency of the core.

[0102] Furthermore, when the fresh air system is in the first working mode, the indoor exhaust air will be mixed with the outdoor fresh air in the first chamber 41, which can increase the amount of heat entering the heat exchange core 1 and indirectly increase the antifreeze property of the core.

[0103] like Figure 3As shown, when the fresh air system is in the second working mode: the first valve 51, the second valve 52 and the fifth valve 55 are opened, the sixth valve 56, the third valve 53 and the fourth valve 54 are closed, the first fan 71 is closed, and the second fan 72 is opened.

[0104] Outdoor fresh air enters the first chamber 41 through the first valve 51, passes through the heat exchange core 1, enters the third chamber 43, passes through the fifth valve 55, enters the second chamber 42, and is discharged to the outdoors through the second valve 52 by the second fan 72.

[0105] The second working mode is suitable for summer. In summer, the outdoor temperature is high, and the indoor temperature is low due to air conditioning. The heat exchange core 1 will condense in the fresh air passage. Therefore, the control unit 200 puts the fresh air system in the second working mode, and the exhaust function of the second fan 72 is used to dry the heat exchange core 1. At the same time, the fourth valve 54 is closed to prevent the outdoor humid hot air from entering the room and taking away the indoor cold air.

[0106] like Figure 4a and Figure 4b As shown, the fresh air system is in the third working mode:

[0107] like Figure 4a As shown, the fresh air system is first placed in the first state of the third working mode by the control unit 200: the first valve 51, the second valve 52, the third valve 53 and the fifth valve 55 are closed, the sixth valve 56 and the fourth valve 54 are opened, the first fan 71 is opened, and the second fan 72 is closed. The indoor air enters the fourth chamber 44 through the indoor air outlet 31, enters the first chamber 41 from the fourth chamber 44 through the sixth valve 56, then passes through the heat exchange core 1, enters the third chamber 43, and finally enters the room through the fourth valve 54. This process can convert the heat exchange core 1 from the frozen state to the condensed state.

[0108] like Figure 4b As shown, after the set time is reached, the control unit 200 puts the fresh air system in the second state of the third working mode: the first valve 51, the second valve 52, the third valve 53 and the sixth valve 56 are closed, the fifth valve 55 and the fourth valve 54 are opened, the first fan 71 is opened, and the second fan 72 is closed. The indoor air enters the fourth chamber 44 through the indoor air outlet 31, passes through the heat exchange core 1, enters the second chamber 42, enters the third chamber 43 from the second chamber 42 through the fifth valve 55, and finally enters the room through the fourth valve 54. This process can alleviate the condensation of the heat exchange core 1.

[0109] The third working mode is suitable for extreme weather in winter. In extreme weather in winter, the outdoor temperature is too low and the indoor temperature is high, and the heat exchange core 1 will freeze. At this time, the exhaust duct (second chamber 42) is frozen, and the heat exchange core 1 is completely unable to fully exchange heat. At this time, the control unit 200 is used to make the fresh air system first in the first state of the third working mode, and the indoor hot air comes to the fresh air duct of the heat exchange core 1. The exhaust duct can be thawed through the thermal effect of the fresh air duct and the material properties of the heat exchange core 1. When the heat exchange core 1 is thawed, the fifth valve 55 is opened, the sixth valve 56 is closed, and the exhaust duct is used. The heat exchange core 1 changes from an ice state to a condensation state, and then the first fan 71 is used to blow the humidity and heat in the heat exchange core 1 and the exhaust duct into the room, and the indoor temperature is indirectly raised, and the condensation problem of the heat exchange core 1 can also be alleviated.

[0110] Among them, the first state of the third working mode of the fresh air system is changed to the second state after a preset time. The preset time can be set in advance. The preset time can be set according to the actual climatic conditions in the north and south. For example, the north is prone to freezing, so the time can be set longer.

[0111] In summary of the above embodiments, the fresh air system provided by the present disclosure includes a normal full heat exchange mode, a first working mode, a second working mode and a third working mode. By cooperating with various valves and fans in the control unit 200, switching between different working modes can be achieved.

[0112] The first working mode realizes the secondary utilization of the heat of the wind entering the exhaust duct indoors after full heat exchange through the coordination between multiple valves, thereby increasing the core exchange efficiency and reducing indoor heat loss. In winter, it can both introduce fresh air and prevent condensation on the core.

[0113] The second working mode uses the fan to provide air volume to dry the core. When designing the fresh air system, there is no need to add a water tray to discharge the moisture generated by the core after full heat exchange.

[0114] The third working mode addresses the problem of freezing of the core exhaust duct by first thawing the exhaust duct through the fresh air duct, and then blowing the moisture and heat on the exhaust duct into the room.

[0115] By changing the air duct through the above three working modes, the effect of removing condensation can be achieved, and the problem of core icing can be solved.

[0116] Some embodiments further provide a method for operating the above-mentioned fresh air system, including:

[0117] A fresh air system is provided, comprising a housing 100, wherein a heat exchange core 1 and a control unit 200 are arranged in the housing 100, and an outdoor air inlet 21, an indoor air inlet 22, an indoor air outlet 31 and an outdoor air outlet 32 ​​are arranged on the housing 100; the fresh air system has a first working mode;

[0118] The control unit 200 is used to put the fresh air system into the first working mode. After the air from the indoor air outlet 31 passes through the heat exchange core 1, part of the air is discharged to the outside through the outdoor air outlet 32, and the other part of the air is mixed with the air from the outdoor air inlet 21, passes through the heat exchange core 1, and then enters the room through the indoor air inlet 22.

[0119] In some embodiments, the fresh air system also includes a second working mode; the fresh air system is placed in the second working mode by the control unit 200, and the wind from the outdoor air inlet 21 passes through the heat exchange core 1 and is discharged to the outside through the outdoor air outlet 32.

[0120] In some embodiments, the fresh air system also includes a third working mode; the fresh air system is placed in the third working mode by the control unit 200, and the air from the indoor air outlet 31 passes through the heat exchange core 1 and then enters the room through the indoor air inlet 22.

[0121] In some embodiments, a first cavity 41 , a second cavity 42 , a third cavity 43 , and a fourth cavity 44 are formed in the housing 100 , and the third working mode includes a first state and a second state.

[0122] First, the control unit 200 is used to put the fresh air system in the first state of the third working mode. The wind from the indoor air outlet 31 enters the fourth chamber 44, enters the first chamber 41 from the fourth chamber 44, enters the third chamber 43 from the first chamber 41 through the heat exchange core 1, and finally enters the room from the third chamber 43 through the indoor air inlet 22.

[0123] Then, the control unit 200 is used to put the fresh air system into the second state of the third working mode, and the wind from the indoor air outlet 31 enters the fourth chamber 44, enters the second chamber 42 from the fourth chamber 44 through the heat exchange core 1, enters the third chamber 43 from the second chamber 42, and finally enters the room from the third chamber 43 through the indoor air inlet 22.

[0124] like Figure 5 As shown in the figure, the judgment process of which working mode the fresh air system adopts is:

[0125] Detect whether there is condensation on the heat exchange core 1 through the temperature and humidity system;

[0126] If it is detected that there is no condensation on the heat exchange core 1, the normal full heat exchange mode is performed;

[0127] If condensation is detected on the heat exchange core 1, the relationship between T1 and T2 is further determined. If T1>T2, the second working mode is performed. If T1≤T2, the relationship between T1 and T3 is further determined. If |T1-T3|>X, the first working mode is performed. If |T1-T3|≤X, the third working mode is performed.

[0128] Among them, T1 is the outdoor temperature, T2 is the indoor temperature, and T3 is the fresh air outlet temperature. X is the preset temperature value, which can be set as needed;

[0129] The method of detecting whether the heat exchange core 1 has condensation by the temperature and humidity system can be realized by related existing technologies, which will not be described here. The temperature and humidity system can be set to detect whether the heat exchange core 1 has condensation every few minutes;

[0130] When the three mode conditions are not met, it returns to the normal full heat exchange mode; when the system finds that there is a condensation problem, it follows Figure 5 The process shown is carried out.

[0131] Based on the above-mentioned embodiments of the present invention, unless explicitly denied, the technical features of one embodiment may be beneficially combined with one or more other embodiments.

[0132] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A fresh air system, characterized in that: The invention comprises a shell (100), wherein a heat exchange core (1) and a control unit (200) are arranged in the shell (100), and an outdoor air inlet (21), an indoor air inlet (22), an indoor air outlet (31) and an outdoor air outlet (32) are arranged on the shell (100); the fresh air system has a first working mode; The control unit (200) is configured to place the fresh air system in the first working mode, so that after the air from the indoor air outlet (31) passes through the heat exchange core (1), a portion of the air is discharged to the outside through the outdoor air outlet (32), and the other portion of the air is mixed with the air from the outdoor air inlet (21), passes through the heat exchange core (1), and then enters the room through the indoor air inlet (22); A first cavity (41), a second cavity (42), a third cavity (43) and a fourth cavity (44) are formed in the housing (100); The control unit (200) is configured to place the fresh air system in the first working mode, so that the air from the indoor air outlet (31) first enters the fourth chamber (44), then passes through the heat exchange core (1) and enters the second chamber (42), and then a portion of the air is discharged to the outside through the outdoor air outlet (32), and another portion of the air enters the first chamber (41), mixes with the air entering the first chamber (41) through the outdoor air inlet (21), and then passes through the heat exchange core (1) and enters the third chamber (43), and finally enters the room from the third chamber (43) through the indoor air inlet (22); The fresh air system also has a second working mode, and the control unit (200) is configured to put the fresh air system into the second working mode, so that the air from the outdoor air inlet (21) passes through the heat exchange core (1) and is discharged to the outside through the outdoor air outlet (32); The control unit (200) is configured to place the fresh air system in the second working mode, so that the air from the outdoor air inlet (21) first enters the first chamber (41), then passes through the heat exchange core (1) into the third chamber (43), then passes through the third chamber (43) into the second chamber (42), and finally is discharged from the second chamber (42) to the outside through the outdoor air outlet (32).

2. The fresh air system according to claim 1, characterized in that: The control unit (200) comprises at least one of a first valve (51) and a second valve (52), wherein the first valve (51) is arranged at the outdoor air inlet (21) and is configured to adjust the opening of the outdoor air inlet (21); and the second valve (52) is arranged at the outdoor air outlet (32) and is configured to adjust the opening of the outdoor air outlet (32).

3. The fresh air system according to claim 1, characterized in that: The control unit (200) further comprises a third valve (53), the first chamber (41) is adjacent to the second chamber (42), the third valve (53) is arranged at the connection between the first chamber (41) and the second chamber (42), and is configured to adjust the on-off between the first chamber (41) and the second chamber (42).

4. The fresh air system according to claim 1, characterized in that: The control unit (200) comprises a fourth valve (54), wherein the fourth valve (54) is arranged at the indoor air inlet (22), and the fourth valve (54) is configured to connect the third chamber (43) with the indoor air in an open state, and disconnect the connection between the third chamber (43) and the indoor air in a closed state. The fourth valve (54) is configured to be in a closed state in the second working mode.

5. The fresh air system according to claim 1, characterized in that: The control unit (200) further comprises a fifth valve (55), the second chamber (42) is adjacent to the third chamber (43), the fifth valve (55) is arranged at the connection between the second chamber (42) and the third chamber (43), and is configured to adjust the connection between the third chamber (43) and the second chamber (42).

6. The fresh air system according to any one of claims 1 to 5, characterized in that: The fresh air system also has a third working mode, and the control unit (200) is configured to put the fresh air system in the third working mode, so that the air from the indoor air outlet (31) passes through the heat exchange core (1) and then enters the room through the indoor air inlet (22).

7. The fresh air system according to claim 6, characterized in that: A first cavity (41), a second cavity (42), a third cavity (43) and a fourth cavity (44) are formed in the housing (100), and the third working mode includes a first state and a second state; The control unit (200) is configured to place the fresh air system in the first state of the third working mode, so that the air from the indoor air outlet (31) enters the fourth chamber (44), enters the first chamber (41) from the fourth chamber (44), enters the third chamber (43) from the first chamber (41) through the heat exchange core (1), and finally enters the room from the third chamber (43) through the indoor air inlet (22); The control unit (200) is further configured to place the fresh air system in the second state of the third working mode, so that the air from the indoor air outlet (31) enters the fourth chamber (44), enters the second chamber (42) from the fourth chamber (44) through the heat exchange core (1), enters the third chamber (43) from the second chamber (42), and finally enters the room from the third chamber (43) through the indoor air inlet (22).

8. The fresh air system according to claim 7, characterized in that: The control unit (200) further comprises a first valve (51) and a second valve (52); the first valve (51) is arranged at the outdoor air inlet (21) and is configured to adjust the opening degree of the outdoor air inlet (21); the second valve (52) is arranged at the outdoor air outlet (32) and is configured to adjust the opening degree of the outdoor air outlet (32); the first valve (51) and the second valve (52) are configured to be closed in the third working mode.

9. The fresh air system according to claim 7, characterized in that: The control unit (200) further comprises a fifth valve (55) and a sixth valve (56); the second chamber (42) is adjacent to the third chamber (43); the fifth valve (55) is arranged at the connection between the second chamber (42) and the third chamber (43), and is configured to adjust the connection between the third chamber (43) and the second chamber (42); the fourth chamber (44) is adjacent to the first chamber (41); the sixth valve (56) is arranged at the connection between the fourth chamber (44) and the first chamber (41), and is configured to adjust the connection between the fourth chamber (44) and the first chamber (41).

10. A method for operating the fresh air system according to any one of claims 1 to 9, comprising: A fresh air system is provided, comprising a housing (100), wherein a heat exchange core (1) and a control unit (200) are arranged in the housing (100), and an outdoor air inlet (21), an indoor air inlet (22), an indoor air outlet (31) and an outdoor air outlet (32) are arranged on the housing (100); the fresh air system has a first working mode; The control unit (200) is used to place the fresh air system in the first working mode. After the air from the indoor air outlet (31) passes through the heat exchange core (1), a portion of the air is discharged to the outside through the outdoor air outlet (32), and the other portion of the air is mixed with the air from the outdoor air inlet (21), passes through the heat exchange core (1), and then enters the room through the indoor air inlet (22).

11. The method for operating the fresh air system according to claim 10, characterized in that: The fresh air system also includes a second working mode; The control unit (200) places the fresh air system in the second working mode, and the air from the outdoor air inlet (21) passes through the heat exchange core (1) and is then discharged to the outside through the outdoor air outlet (32).

12. The method for operating a fresh air system according to claim 10 or 11, characterized in that: The fresh air system also includes a third working mode; The control unit (200) enables the fresh air system to be in the third working mode, and the air from the indoor air outlet (31) passes through the heat exchange core (1) and then enters the room through the indoor air inlet (22).

13. The method for operating the fresh air system according to claim 12, characterized in that: A first cavity (41), a second cavity (42), a third cavity (43) and a fourth cavity (44) are formed in the housing (100), and the third working mode includes a first state and a second state; Firstly, the control unit (200) is used to place the fresh air system in the first state of the third working mode, so that the air from the indoor air outlet (31) enters the fourth chamber (44), enters the first chamber (41) from the fourth chamber (44), enters the third chamber (43) from the first chamber (41) through the heat exchange core (1), and finally enters the room from the third chamber (43) through the indoor air inlet (22); Then, the control unit (200) is used to place the fresh air system in the second state of the third working mode, and the air from the indoor air outlet (31) enters the fourth chamber (44), passes through the heat exchange core (1) from the fourth chamber (44) and enters the second chamber (42), enters the third chamber (43) from the second chamber (42), and finally enters the room from the third chamber (43) through the indoor air inlet (22).

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