Heat exchange core, fresh air machine and control method thereof

Abstract

The application provides a heat exchange core, a fresh air machine and a control method thereof, and belongs to the technical field of air conditioning. The heat exchange core comprises an intermediate heat exchange core, which has multiple intermediate heat exchange layers. Each intermediate heat exchange layer has multiple intermediate channels. The first end of each two adjacent intermediate channels in each intermediate heat exchange layer is open, and the other end can be controlled to be opened or closed. The second end of the same intermediate channel is opposite to the first end. In the adjacent two intermediate heat exchange layers, the odd-numbered intermediate channels of one intermediate heat exchange layer are controllably communicated with the even-numbered intermediate channels of the other intermediate heat exchange layer. The indoor side air duct body has multiple indoor side air duct layers, and the outdoor side air duct body has multiple outdoor side air duct layers. The adjacent two air duct layers in each indoor side air duct layer or outdoor side air duct layer can be controlled to be opened or closed. The application improves the heat exchange efficiency of the heat exchange core.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioning, and particularly relates to a heat exchange core, a fresh air machine and a control method thereof. BACKGROUND

[0002] The heat exchange core in a conventional fresh air handling unit adopts a structure of heat exchange on two sides, which limits the heat exchange efficiency of the heat exchange core and results in a low heat exchange efficiency of the heat exchange core. SUMMARY

[0003] Therefore, the present application provides a heat exchange core, a fresh air machine and a control method thereof, which can solve the technical problem of low heat exchange efficiency of the heat exchange core in the fresh air handling unit in the prior art.

[0004] In order to solve the above problems, the present application provides a heat exchange core, comprising an intermediate heat exchange core, an indoor side air duct body at a first end of the intermediate heat exchange core, and an outdoor side air duct body at a second end of the intermediate heat exchange core, wherein the intermediate heat exchange core has a plurality of intermediate heat exchange layers stacked along a first direction, each of the intermediate heat exchange layers has a plurality of intermediate holes extending along a third direction formed in sequence and at intervals along a second direction, first ends of each two adjacent intermediate holes in each of the intermediate heat exchange layers are open or controllably opened and closed, and second ends of the same intermediate hole are opposite to the first ends, one of the intermediate heat exchange layers in the adjacent two intermediate heat exchange layers is controllably communicated with the other intermediate heat exchange layer in the adjacent two intermediate heat exchange layers at odd-numbered intermediate holes in the second direction of the one intermediate heat exchange layer and even-numbered intermediate holes in the second direction of the other intermediate heat exchange layer, and the odd-numbered intermediate holes are adjacent to the even-numbered intermediate holes, the indoor side air duct body has a plurality of indoor side air duct layers corresponding to the intermediate heat exchange layers in position and number, and the outdoor side air duct body has a plurality of outdoor side air duct layers corresponding to the intermediate heat exchange layers in position and number, and two adjacent air duct layers in each of the indoor side air duct layers or the outdoor side air duct layers can be controlled to be opened and closed.

[0005] In some embodiments, the first end or the second end of each of the intermediate holes is provided with an air port baffle capable of being controlled to be opened or closed.

[0006] In some embodiments, one of the intermediate heat exchange layers in the adjacent two intermediate heat exchange layers has a communication flow channel between the odd-numbered intermediate holes in the second direction of the one intermediate heat exchange layer and the even-numbered intermediate holes in the second direction of the other intermediate heat exchange layer, and the communication flow channel is provided with an air duct baffle capable of being controlled to be opened or closed.

[0007] In some embodiments, each of the indoor side wind channel layers has a plurality of first ports in a fresh air region and a plurality of second ports in a return air region, the fresh air region is provided with a first indoor side baffle, the plurality of first ports are sequentially stacked along the first direction, in the first direction, the first indoor side baffle has a first state of opening the first ports of each odd layer, closing the first ports of each even layer, and a second state of closing the first ports of each odd layer, opening the first ports of each even layer; and / or, the return air region is provided with a second indoor side baffle, the plurality of second ports are sequentially stacked along the first direction, in the first direction, the second indoor side baffle has a third state of closing the second ports of each odd layer, and a fourth state of opening the second ports of each even layer.

[0008] In some embodiments, the first indoor side baffle includes a first plate body, a plurality of first through holes formed in the first plate body, the size of the first through holes is matched with the size of the first ports, and the distance between adjacent two first through holes in the first direction is equal to the height of one first port in the first direction.

[0009] In some embodiments, the first indoor side baffle further includes a first driving rod, the first driving rod is in engagement with an adjusting gear, and rotation of the adjusting gear can drive the first indoor side baffle to move along the first direction through the first driving rod to realize switching of the first indoor side baffle between the first state and the second state.

[0010] In some embodiments, the second indoor side baffle includes a second plate body, a plurality of second through holes formed in the second plate body, the size of the second through holes is matched with the size of the second ports, and the distance between adjacent two second through holes in the first direction is equal to the height of one second port in the first direction, the second indoor side baffle further includes a second driving rod, the second driving rod is in engagement with an adjusting gear, and rotation of the adjusting gear can drive the second indoor side baffle to move along the first direction through the second driving rod to realize switching of the second indoor side baffle between the third state and the fourth state.

[0011] The application also provides a fresh air machine, comprising the heat exchange core.

[0012] The application also provides a control method of a fresh air machine, for controlling the fresh air machine, comprising the following steps:

[0013] Obtaining a theoretical energy efficiency V of the fresh air machine;

[0014] When V≥C, controlling the fresh air machine to run in a high-efficiency heat exchange mode;

[0015] When V < C, control the fresh air fan to run the normal heat exchange mode.

[0016] In some embodiments,

[0017] When the fresh air fan runs the high-efficiency heat exchange mode, control each air outlet damper to be in a closed state, each air duct damper to be in an open state, and control the first indoor side damper to be in a second state to make each first port in an open state as a fresh air outlet, and control the second indoor side damper to be in a fourth state to make each second port in an open state as a return air inlet; or,

[0018] When the fresh air fan runs the normal heat exchange mode, control each air outlet damper to be in an open state, each air duct damper to be in a closed state, and control the first indoor side damper to be in a first state to make each first port in an open state as a fresh air outlet, and control the second indoor side damper to be in a third state to make each second port in an open state as a return air inlet.

[0019] In some embodiments, the theoretical energy efficiency V of the fresh air fan is obtained as follows:

[0020] Obtain the number of people N in the indoor space, the indoor dry-bulb temperature T 内干 , the indoor wet-bulb temperature T 内湿 , the outdoor dry-bulb temperature T 外干 , the outdoor wet-bulb temperature T 外湿 ;

[0021] Calculate the fresh air demand Q according to N, and calculate the power difference △P=P 高效 -P 普通 of the fresh air fan in the high-efficiency mode and the normal mode under Q based on an internal storage table;

[0022] Calculate the indoor and outdoor enthalpy difference △h=h 外 -h 内 and the enthalpy efficiency difference △E=E 高效 -E 普通 according to T 内干 , T 内湿 , T 外干 , T 外湿 and based on an internal storage table;

[0023] V=△h·△E·Q / △P.

[0024] The application provides a heat exchange core, a fresh air machine and a control method thereof. The design that one end of each intermediate hole is open and the other end is controllably opened and closed is combined with the design that the controllable opening and closing between adjacent two intermediate holes, so that the intermediate heat exchange core has switchable ordinary heat exchange state (mode) and high-efficiency heat exchange state (mode). When the intermediate heat exchange core is in the high-efficiency heat exchange state, the periphery of at least part of the intermediate hole has a larger contact area with the airflow of another flow direction, so that the heat exchange efficiency of the heat exchange core is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a perspective structural schematic view of the heat exchange core of the embodiment of the application.

[0026] Figure 2 It is a top view of Figure 1 .

[0027] Figure 3 It is a structural schematic view of the intermediate heat exchange core in Figure 1 from the perspective of the direction from the outdoor side to the indoor side, and the intermediate heat exchange core is in the high-efficiency heat exchange mode.

[0028] Figure 4 It is a structural schematic view of the intermediate heat exchange core in Figure 1 from the perspective of the direction from the indoor side to the outdoor side, and the intermediate heat exchange core is in the high-efficiency heat exchange mode.

[0029] Figure 5 It is a perspective structural schematic view of the indoor side air duct body in Figure 1 , in which the first indoor side baffle is in the first state, and the second indoor side baffle is in the third state.

[0030] The signs are as follows:

[0031] 1, intermediate heat exchange core; 11, intermediate hole; 2, indoor side air duct body; 21, first indoor side baffle; 211, first plate body; 212, first through hole; 213, first driving rod; 22, second indoor side baffle; 221, second plate body; 222, second through hole; 223, second driving rod; 23, adjusting gear; 3, outdoor side air duct body; 41, air outlet baffle; 42, air duct baffle. DETAILED DESCRIPTION

[0032] Referring to Figures 1 to 5 , according to the embodiment of the application, a heat exchange core is provided, referring to Figure 1 and Figure 2As shown, the heat exchange device comprises an intermediate heat exchange core 1, an indoor-side air duct body 2 at a first end of the intermediate heat exchange core 1 (i.e. at an indoor-side end), and an outdoor-side air duct body 3 at a second end of the intermediate heat exchange core 1 (i.e. at an outdoor-side end). The intermediate heat exchange core 1 has a plurality of intermediate heat exchange layers stacked along a first direction. Each intermediate heat exchange layer has a plurality of intermediate channels 11 extending along a third direction, which are formed in the intermediate heat exchange layer in sequence along a second direction. The first ends of each two adjacent intermediate channels 11 in each intermediate heat exchange layer are open or controllably opened and closed. The second ends of the same intermediate channel 11 are opposite to the first ends. In the adjacent two intermediate heat exchange layers, the odd-numbered intermediate channels 11 in one of the intermediate heat exchange layers are controllably communicated with the even-numbered intermediate channels 11 in the other intermediate heat exchange layer along the second direction, and the odd-numbered intermediate channels 11 are adjacent to the even-numbered intermediate channels 11. The indoor-side air duct body 2 has a plurality of indoor-side air duct layers corresponding to the intermediate heat exchange layers in position. The outdoor-side air duct body 3 has a plurality of outdoor-side air duct layers corresponding to the intermediate heat exchange layers in position. The adjacent two air duct layers in each indoor-side air duct layer or outdoor-side air duct layer can be controlled to be opened and closed, so as to Figure 3 The first direction is specifically a Z-axis direction (positive direction), the second direction is specifically an X-axis direction (positive direction), and the third direction is specifically a Y-axis direction (positive direction). In the technical solution, one end of each intermediate channel 11 is open and the other end is controllably opened and closed, and the controllable opening and closing between the adjacent two intermediate channels 11, so that the intermediate heat exchange core 1 has a switchable ordinary heat exchange state (mode) and a high-efficiency heat exchange state (mode). When the intermediate heat exchange core 1 is in the high-efficiency heat exchange state, the four sides of at least part of the intermediate channels 11 have a larger contact area with the air flow of the other flow direction, thereby greatly improving the heat exchange efficiency of the heat exchange core.

[0033] Referring to Figure 3As shown, as a specific embodiment, the intermediate heat exchange core 1 has ten intermediate heat exchange layers from bottom to top, and each intermediate heat exchange layer is provided with ten intermediate channels 11 from left to right. Taking the second intermediate channel 11 from left to right in the second layer of intermediate heat exchange layers as an example, it is assumed that the airflow flowing in the intermediate channel 11 is fresh air, which is in communication with the intermediate channel 11 marked as b under the left side of the intermediate channel 11 in the high-efficiency heat exchange state. At this time, the c, d, e, and f around the intermediate channel 11 are respectively flowing with return air. In this way, the fresh air flowing in most of the intermediate channels 11 in the intermediate heat exchange core 1 is in contact with the return air in a large area, that is, the four-side heat exchange effect of the heat exchange core is formed. Similarly, for the intermediate channel 11 flowing with return air, it is surrounded by fresh air. Of course, for each intermediate channel 11 at the four-side edge end surface of the intermediate heat exchange core 1, it cannot be surrounded due to the structural limitation, but for an intermediate heat exchange core 1, it is a small part and will not hinder the high-efficiency heat exchange effect brought by the above structure.

[0034] In some embodiments, the first end or the second end of each intermediate channel 11 is provided with an air port baffle 41 capable of being controlled to open or close. Specifically, the air port baffle 41 can adopt the existing air valve structure to realize its function. For example, when the corresponding intermediate channel 11 is controlled to be opened, the air port baffle 41 is controlled to be attached to the channel wall of the intermediate channel 11, and when the corresponding intermediate channel 11 is controlled to be closed, the air port baffle 41 is controlled to be perpendicular to the channel wall, which is simple to control and compact in structure.

[0035] Referring to Figure 3 and Figure 4 As shown, between the first odd-numbered intermediate channel 11 in one of the two adjacent intermediate heat exchange layers in the second direction and the second even-numbered intermediate channel 11 in the other intermediate heat exchange layer in the second direction, there is a communication flow channel, and the communication flow channel is provided with an air channel baffle 42 capable of being controlled to open or close. Referring to Figure 3 When the air channel baffle 42 is controlled to be opened (that is, the air channel baffle 42 is controlled to be opened), each air port baffle 41 is controlled to be closed. The intermediate channel a and the intermediate channel b are in communication to form a fresh air flow channel. The fresh air enters the fresh air flow channel from b in Figure 3 and flows out of the fresh air flow channel at the other end opening (the indoor side) corresponding to a. It can be understood that d and e will also be synchronously conducted under the control of the air channel baffle 42, that is, d and e are in communication to form a return air flow channel, and the return air flows out of the return air flow channel from Figure 3The air enters the return air duct at the opening at point e (indoor side) and exits at point d. The corresponding heat exchange mode is the high-efficiency heat exchange mode. The other positions are similar and will not be elaborated further. It should be further explained that when the duct baffle 42 is closed and the corresponding air outlet baffles 41 are opened, the intermediate ducts 11 on the same floor form a fresh air duct or a return air duct. Fresh air enters from... Figure 3 The air flows in from the first end (outdoor side) of the bottom layer and then flows out from the second end (indoor side) of the same layer. Similarly, the indoor return air flows in from the second end (indoor side) of the second layer from bottom to top and then flows out from the first end (outdoor side) of the same layer. The corresponding heat exchange mode is the ordinary heat exchange mode.

[0036] See Figure 5 As shown, each indoor air duct layer has multiple first openings in the fresh air area and multiple second openings in the return air area. The fresh air area is provided with a first indoor baffle 21. The multiple first openings are stacked sequentially along a first direction. In the first direction, the first indoor baffle 21 has a first state of opening the first openings of each odd-numbered layer and closing the first openings of each even-numbered layer, and a second state of closing the first openings of each odd-numbered layer and opening the first openings of each even-numbered layer; and / or, the return air area is provided with a second indoor baffle 22. The multiple second openings are stacked sequentially along the first direction. In the first direction, the second indoor baffle 22 has a third state of closing the second openings of each odd-numbered layer and a fourth state of opening the second openings of each even-numbered layer.

[0037] Specifically, see [link / reference] Figure 3 , Figure 4 as well as Figure 5 As shown, for the outdoor side air duct 3, it has a first air duct layer, a second air duct layer, and so on, alternating from bottom to top. Figure 3 The bottommost intermediate heat exchange layer serves as the fresh air layer, with the layers alternating from bottom to top as return air layer, fresh air layer, and return air layer, and so on. When the intermediate heat exchange core 1 is in high-efficiency heat exchange mode, the bottommost fresh air layer is the fresh air intake, connected to the corresponding intermediate duct 11 in the layer above it, and flows out to the indoor side through the intermediate duct 11 of this layer. Specifically, at this time, the first indoor side baffle 21 of the indoor side air duct 2 is in the second state, that is, the first through hole 212 of the second layer from bottom to top will be in the open state, and fresh air is sent to the indoor space through this. Similarly, in this mode, the inflow and outflow of return air are exactly opposite, that is, the indoor side flows in from the bottommost layer, while the outdoor side flows out through the intermediate duct 11 of the layer above, corresponding to the fourth state of the second indoor side baffle 22 mentioned above. In contrast, when the intermediate heat exchange core 1 is in normal heat exchange mode, the fresh air will flow in and out from the same layer, and at this time the corresponding Figure 5In the first state, the first inner side baffle 21 should be in the first state, and conversely, the second inner side baffle 22 should be in the third state.

[0038] As a specific embodiment, the first inner side baffle 21 comprises a first plate body 211, a plurality of first through holes 212 configured on the first plate body 211, the size of the first through holes 212 is adapted to the size of the first port, and the distance between two adjacent first through holes 212 in the first direction is equal to the height of a first port in the first direction, so that the state switching of the first inner side baffle 21 can be realized by driving the first inner side baffle 21 to translate up and down by the distance of a first through hole 212, further, the first inner side baffle 21 further comprises a first driving rod 213, the first driving rod 213 is engaged with the adjusting gear 23, that is, the first driving rod 213 has corresponding teeth, which is essentially a rack, and the first driving rod 213 is connected with the outer side wall of the inner side air duct body 2 through a corresponding slide rail structure, the rotation of the adjusting gear 23 (for example, driven by a motor) can drive the first inner side baffle 21 to move in the first direction through the first driving rod 213 to realize the switching of the first inner side baffle 21 between the first state and the second state.

[0039] Similarly to the first inner side baffle 21, the second inner side baffle 22 comprises a second plate body 221, a plurality of second through holes 222 configured on the second plate body 221, the size of the second through holes 222 is adapted to the size of the second port, and the distance between two adjacent second through holes 222 in the first direction is equal to the height of a second port in the first direction, the second inner side baffle 22 further comprises a second driving rod 223, the second driving rod 223 is engaged with the adjusting gear 23, the rotation of the adjusting gear 23 can drive the second inner side baffle 22 to move in the first direction through the second driving rod 223 to realize the switching of the second inner side baffle 22 between the third state and the fourth state. In a preferred embodiment, the first driving rod 213 and the second driving rod 223 are simultaneously driven by the adjusting gear 23, for example Figure 5 As shown, the first driving rod 213 and the second driving rod 223 are arranged in parallel on opposite sides of the adjusting gear 23, so that when the first driving rod 213 drives the first inner side baffle 21 to switch from the first state to the second state, the second driving rod 223 can exactly switch the second inner side baffle 22 from the third state to the fourth state, and the control is further simplified.

[0040] According to the embodiments of the present application, a fresh air machine is also provided, comprising the heat exchange core as described above.

[0041] According to the embodiments of the present application, a control method of a fresh air machine is also provided, for controlling the fresh air machine as described above, comprising the following steps:

[0042] acquire a theoretical energy efficiency V of the fresh air fan;

[0043] when V≥C, control the fresh air fan to run in the high-efficiency heat exchange mode for a first target duration;

[0044] when V

[0045] Specifically, when the fresh air fan runs in the high-efficiency heat exchange mode, control each air outlet damper 41 to be in a closed state, each air duct damper 42 to be in an open state, and control the first indoor side damper 21 to be in a second state to make each first port in an open state as a fresh air outlet, and control the second indoor side damper 22 to be in a fourth state to make each second port in an open state as a return air inlet; or, when the fresh air fan runs in the ordinary heat exchange mode, control each air outlet damper 41 to be in an open state, each air duct damper 42 to be in a closed state, and control the first indoor side damper 21 to be in a first state to make each first port in an open state as a fresh air outlet, and control the second indoor side damper 22 to be in a third state to make each second port in an open state as a return air inlet.

[0046] In a specific embodiment, the theoretical energy efficiency V of the fresh air fan is acquired in the following manner:

[0047] acquire the number of people N in the indoor space, the indoor dry-bulb temperature T 内干 , the indoor wet-bulb temperature T 内湿 , the outdoor dry-bulb temperature T 外干 , the outdoor wet-bulb temperature T 外湿 ; calculate the fresh air demand Q=Nq (where q is the fresh air demand of a single person) according to N, and calculate the power difference △P=P 高效 -P 普通 of the fresh air fan in the high-efficiency mode and the ordinary mode under Q based on an internal storage table; calculate the indoor-outdoor enthalpy difference △h=h 外 -h 内 and the enthalpy efficiency difference △E=E 高效 -E 普通 according to T 内干 , T 内湿 , T 外干 , T 外湿 and based on an internal storage table; V=△h·△E·Q / △P. In this way, the running mode of the heat exchange core is linked to the indoor and outdoor temperatures, the number of people, etc. for adjustment, and the fresh air fan group can run at the best energy efficiency.

[0048] Those skilled in the art will readily understand that the advantageous technical features of each of the above-described modes can be freely combined and superimposed without conflict.

[0049] The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fresh air machine characterized by, The heat exchange core comprises an intermediate heat exchange core (1), an indoor side air duct body (2) at a first end of the intermediate heat exchange core (1), and an outdoor side air duct body (3) at a second end of the intermediate heat exchange core (1). The intermediate heat exchange core (1) has multiple intermediate heat exchange layers stacked along a first direction. Each intermediate heat exchange layer has multiple intermediate channels (11) extending along a third direction, which are sequentially and spacedly formed along a second direction. For each intermediate channel (11), one of the first ends of two adjacent intermediate channels is open, and the other is controllably opened and closed. For the second end of the same intermediate channel, the state is opposite to that of the first end. For the odd-numbered intermediate channels (11) in one of the intermediate heat exchange layers in the second direction and the even-numbered intermediate channels (11) in the other intermediate heat exchange layer in the second direction, controllable communication is provided. The odd-numbered intermediate channels (11) are adjacent to the even-numbered intermediate channels (11). The indoor side air duct body (2) has multiple indoor side air duct layers corresponding to the intermediate heat exchange layers in position. The outdoor side air duct body (3) has multiple outdoor side air duct layers corresponding to the intermediate heat exchange layers in position. Two adjacent air duct layers in each indoor side air duct layer or outdoor side air duct layer can be controlled to be opened and closed. The intermediate heat exchange core (1) has a normal heat exchange mode and a high-efficiency heat exchange mode. The first end or the second end of each intermediate channel (11) is provided with an air port baffle (41) that can be controlled to be opened or closed. The odd-numbered intermediate channels (11) in one of the intermediate heat exchange layers in the second direction and the even-numbered intermediate channels (11) in the other intermediate heat exchange layer in the second direction have a communication flow channel therebetween. The communication flow channel is provided with an air duct baffle (42) that can be controlled to be opened or closed. Each indoor side air duct layer has multiple first port portions in a fresh air area and multiple second port portions in a return air area. The fresh air area is provided with a first indoor side baffle (21). Multiple first port portions are sequentially stacked along the first direction. In the first direction, the first indoor side baffle (21) has a first state of opening the first port portions of each odd layer and closing the first port portions of each even layer, and a second state of closing the first port portions of each odd layer and opening the first port portions of each even layer. The return air area is provided with a second indoor side baffle (22). Multiple second port portions are sequentially stacked along the first direction. In the first direction, the second indoor side baffle (22) has a third state of closing the second port portions of each odd layer and opening the second port portions of each even layer, and a fourth state of opening the second port portions of each odd layer and closing the second port portions of each even layer.When the fresh air machine operates in the high-efficiency heat exchange mode, each of the air port baffles (41) is in a closed state, each of the air duct baffles (42) is in an open state, the first indoor side baffle (21) is in the second state to make each first port portion in the open state as a fresh air outlet, and the second indoor side baffle (22) is in the fourth state to make each second port portion in the open state as a return air inlet; when the fresh air machine operates in the ordinary heat exchange mode, each of the air port baffles (41) is in an open state, each of the air duct baffles (42) is in a closed state, the first indoor side baffle (21) is in the first state to make each first port portion in the open state as a fresh air outlet, and the second indoor side baffle (22) is in the third state to make each second port portion in the open state as a return air inlet; the first direction is a Z-axis direction, the second direction is an X-axis direction, and the third direction is a Y-axis direction.

2. The fresh air machine of claim 1, wherein, The first inner side baffle (21) comprises a first plate body (211) and a plurality of first through holes (212) configured on the first plate body (211), the size of the first through holes (212) is matched with the size of the first port, and the distance between two adjacent first through holes (212) in the first direction is equal to the height of one first port in the first direction.

3. The fresh air machine of claim 2, wherein, The first inner side baffle (21) further comprises a first driving rod (213) which is engaged with an adjusting gear (23), and the rotation of the adjusting gear (23) can drive the first inner side baffle (21) to move along the first direction through the first driving rod (213) to realize the switching of the first inner side baffle (21) between the first state and the second state.

4. The fresh air machine of claim 3, wherein, The second inner side baffle (22) comprises a second plate body (221) and a plurality of second through holes (222) configured on the second plate body (221), the size of the second through holes (222) is matched with the size of the second port, and the distance between two adjacent second through holes (222) in the first direction is equal to the height of one second port in the first direction, and the second inner side baffle (22) further comprises a second driving rod (223) which is engaged with an adjusting gear (23), and the rotation of the adjusting gear (23) can drive the second inner side baffle (22) to move along the first direction through the second driving rod (223) to realize the switching of the second inner side baffle (22) between the third state and the fourth state.

5. A control method of a fresh air machine, characterized by, The method for controlling the fresh air machine of any one of claims 1 to 4 comprises the following steps: obtaining a theoretical energy efficiency V of the fresh air machine; when V≥C, controlling the fresh air machine to run in a high-efficiency heat exchange mode; when V 6. The control method of claim 5, wherein when the fresh air machine runs in the high-efficiency heat exchange mode, controlling each air outlet baffle (41) to be in a closed state, each air duct baffle (42) to be in an open state, the first inner side baffle (21) to be in the second state so that each first port in the open state serves as a fresh air outlet, and the second inner side baffle (22) to be in the fourth state so that each second port in the open state serves as a return air inlet; or when the fresh air machine runs in the ordinary heat exchange mode, controlling each air outlet baffle (41) to be in an open state, each air duct baffle (42) to be in a closed state, the first inner side baffle (21) to be in the first state so that each first port in the open state serves as a fresh air outlet, and the second inner side baffle (22) to be in the third state so that each second port in the open state serves as a return air inlet. The theoretical energy efficiency V of the fresh air machine is obtained in the following manner: V=△h·△E·Q / △P. ​ 7. The control method according to claim 5, characterized by, ​ obtaining the number of people N in the indoor space, the indoor dry-bulb temperature T 内干 , the indoor wet-bulb temperature T 内湿 , the outdoor dry-bulb temperature T 外干 , the outdoor dry-bulb temperature T 外湿 ; According to N, the fresh air demand Q is obtained, and the power difference AP=P between the high efficiency mode and the ordinary mode of the fresh air machine under Q is calculated based on an internal storage table 高效 -P 普通 ; According to T 内干 , T 内湿 , T 外干 , T 外湿 and based on an internally stored table, the indoor and outdoor enthalpy difference Δh = h 外 -h 内 and the enthalpy efficiency difference ΔE = E 高效 -E 普通 are calculated; ​

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