Fresh air fan and control method

Abstract

This disclosure relates to a fresh air unit and its control method. The fresh air unit includes: a housing with a fresh air inlet and a return air outlet communicating with the outside, and a first return air inlet, a second return air inlet, and a fresh air outlet communicating with the inside, the first return air inlet and the second return air inlet being located at different positions; and a heat exchange core disposed within the housing. The fresh air unit has a first operating mode and a second operating mode that can be switched between each other. In the first operating mode, the first return air inlet, the heat exchange core, and the return air outlet are fluidly connected, and simultaneously the fresh air inlet, the heat exchange core, and the fresh air outlet are fluidly connected. In the second operating mode, the second return air inlet, the heat exchange core, and the return air outlet are fluidly connected, and simultaneously the fresh air inlet, the heat exchange core, and the fresh air outlet are fluidly connected. The different locations of the first and second return air inlets change the area of ​​the heat exchange core through which fluid flows, allowing more of the heat exchange core to be fully utilized and improving its utilization rate.

Description

Technical Field

[0001] This disclosure relates to the field of air conditioning technology, and more particularly to a fresh air unit and its control method. Background Technology

[0002] There are various types of fresh air systems, among which total heat recovery fresh air units have built-in heat recovery and purification filtration functions, and do not require a cold or heat source, making them highly accepted in the market. In some related technologies, the flow channel form of fresh air systems includes crossflow or parallel flow, with a fixed airflow pattern, low heat exchange utilization rate of the heat exchange core, poor heat recovery efficiency, and reduced fresh air quality. Summary of the Invention

[0003] Some embodiments of this disclosure propose a fresh air fan and control method to alleviate the problem of low heat exchange utilization rate of the heat exchange core.

[0004] In one aspect of this disclosure, a new air ventilator is provided, comprising:

[0005] The housing has a fresh air inlet and a return air outlet connecting to the outside, and a first return air inlet, a second return air inlet, and a fresh air outlet connecting to the inside, wherein the first return air inlet and the second return air inlet are located at different positions; and

[0006] The heat exchange core is disposed within the housing;

[0007] The fresh air unit has a first working mode and a second working mode that can be switched between each other. In the first working mode, the first return air inlet, the heat exchange core and the return air outlet are fluidly connected, and the fresh air inlet, the heat exchange core and the fresh air outlet are also fluidly connected. In the second working mode, the second return air inlet, the heat exchange core and the return air outlet are fluidly connected, and the fresh air inlet, the heat exchange core and the fresh air outlet are also fluidly connected.

[0008] In some embodiments, the first return air inlet and the second return air inlet are configured to be used selectively.

[0009] In some embodiments, the fresh air outlet is located between the first return air inlet and the second return air inlet.

[0010] In some embodiments, the first return air inlet and the return air outlet are substantially on the same straight line, and the second return air inlet and the fresh air inlet are substantially on the same straight line.

[0011] In some embodiments, the fresh air unit further includes a first regulating plate for opening or closing the first return air inlet, and a second regulating plate for opening or closing the second return air inlet.

[0012] In some embodiments, the housing includes a first sidewall and a second sidewall disposed opposite to each other, the first return air inlet, the second return air inlet and the fresh air outlet are disposed on the first sidewall, and the fresh air inlet and the return air outlet are disposed on the second sidewall.

[0013] In some embodiments, a first cavity, a second cavity, and a third cavity are sequentially provided between the first sidewall and the second sidewall within the housing, and the heat exchange core is disposed in the second cavity.

[0014] In some embodiments, the fresh air unit includes a first adjustment plate and a second adjustment plate;

[0015] In the first working mode, the first regulating plate opens the first return air inlet and divides the first cavity into a first partition cavity and a second partition cavity. The first return air inlet is located in the first partition cavity, the second return air inlet and the fresh air outlet are located in the second partition cavity, and the second regulating plate closes the second return air inlet.

[0016] In the second operating mode, the first regulating plate closes the first return air inlet, the second regulating plate opens the second return air inlet, and divides the first cavity into a third partition cavity and a fourth partition cavity. The first return air inlet and the fresh air outlet are located in the third partition cavity, and the second return air inlet is located in the fourth partition cavity.

[0017] In some embodiments, the fresh air unit further includes a first partition, a second partition, and a third partition located between the first cavity and the second cavity;

[0018] In the first working mode, a first channel is formed above the first partition, and the first channel connects the upper part of the first partition cavity and the second cavity; a second channel is formed below the second partition and the third partition, and the second channel connects the lower part of the second partition cavity and the second cavity; in the height direction, the first channel is located above the second channel;

[0019] In the second operating mode, a third channel is formed below the first partition and the second partition, the third channel connecting the lower part of the third partition cavity and the second cavity; a fourth channel is formed above the third partition, the fourth channel connecting the upper part of the fourth partition cavity and the second cavity; in the height direction, the third channel is located below the fourth channel.

[0020] In some embodiments, the fresh air unit further includes a fourth partition and a fifth partition located between the second cavity and the third cavity, and a sixth partition disposed in the third cavity; the sixth partition divides the third cavity into a fifth partition cavity and a sixth partition cavity, the return air outlet is located in the fifth partition cavity, and the fresh air inlet is located in the sixth partition cavity; a fifth channel is formed below the fourth partition, and a sixth channel is formed above the fifth partition, the fifth channel connecting the lower part of the second cavity and the fifth partition cavity, and the sixth channel connecting the upper part of the second cavity and the sixth partition cavity, wherein the fifth channel is located below the sixth channel in the height direction.

[0021] In some embodiments, the heat exchange core divides the upper part of the second cavity into a first upper cavity and a second upper cavity, and divides the lower part of the second cavity into a first lower cavity and a second lower cavity; the first upper cavity and the first lower cavity are close to the first cavity, and the second upper cavity and the second lower cavity are close to the third cavity;

[0022] In the first working mode, the first return air inlet, the first upper cavity, the heat exchange core, the second lower cavity, and the return air outlet are in fluid communication, while the fresh air inlet, the second upper cavity, the heat exchange core, the first lower cavity, and the fresh air outlet are in fluid communication.

[0023] In the second operating mode, the second return air inlet, the first upper chamber, the heat exchange core, the second lower chamber, and the return air outlet are in fluid communication, while the fresh air inlet, the second upper chamber, the heat exchange core, the first lower chamber, and the fresh air outlet are in fluid communication.

[0024] In some embodiments, the heat exchange core includes a first side, a second side, a third side, and a fourth side connected in sequence to form a closed loop; the first side is located in the first upper cavity, the second side is located in the second upper cavity, the third side is located in the second lower cavity, and the fourth side is located in the first lower cavity.

[0025] In some embodiments, the fresh air system further includes:

[0026] A first fan is located at the fresh air outlet and is connected to the fresh air outlet; and

[0027] The second fan is located at the return air outlet and is connected to the return air outlet.

[0028] In one aspect of this disclosure, a control method for the aforementioned fresh air unit is provided, comprising the following steps:

[0029] When the first operating mode of the fresh air unit is selected, the indoor air flows to the outside through the first return air inlet, the heat exchange core and the return air outlet in sequence; at the same time, the outdoor fresh air flows to the indoor air through the fresh air inlet, the heat exchange core and the fresh air outlet in sequence.

[0030] When the second operating mode of the fresh air unit is selected, the indoor air flows to the outside through the second return air inlet, the heat exchange core and the return air outlet in sequence; at the same time, the outdoor fresh air flows to the indoor air through the fresh air inlet, the heat exchange core and the fresh air outlet in sequence.

[0031] In some embodiments, the control method for the fresh air unit further includes the following steps:

[0032] Before the fresh air system is put into operation for the first time, the following tests should be performed:

[0033] The fresh air unit operates in the first working mode for a first preset time. The heat exchange efficiency is calculated once every second preset time within the first preset time period. The heat exchange efficiency is calculated n times in total, and the average value of the n heat exchange efficiencies is taken as the heat exchange efficiency η1 of the fresh air unit in the first working mode.

[0034] The fresh air unit operates in the second working mode for a first preset time. The heat exchange efficiency is calculated once every second preset time within the first preset time period. The heat exchange efficiency is calculated n times in total, and the average value of the n heat exchange efficiencies is taken as the heat exchange efficiency η2 of the fresh air unit in the second working mode.

[0035] When η2≥η1, the fresh air unit operates in the second working mode; and after running for a preset cycle, the fresh air unit is re-inspected.

[0036] When η2 < η1, the fresh air unit operates in the first working mode; and after running for a preset cycle, the fresh air unit is re-inspected.

[0037] In some embodiments, the control method for the fresh air unit further includes the following steps:

[0038] During a cycle in which the fresh air system operates in the first operating mode, if any of the following conditions exist, the fresh air system will switch from the first operating mode to the second operating mode:

[0039] Operating conditions changed from -20℃ < T xj The change at ≤-10℃ is T xj >-10℃, |T xj -T pj |≥3℃, and φ xj ≤50%;

[0040] Operating conditions are determined by T xj >10℃ and φ xj >50% change is Txj >-10℃, |T xj -T pj |≥3℃, and φ xj ≤50%;

[0041] Operating conditions from -25℃ ≤ T xj The change at ≤-20℃ is T xj >-10℃, |T xj -T pj |≥3℃, and φ xj ≤50%;

[0042] Among them, T xj T represents the fresh air intake temperature at the fresh air inlet. pj φ is the return air inlet temperature; xj The relative humidity of the fresh air intake.

[0043] Based on the above technical solution, this disclosure has at least the following beneficial effects:

[0044] In some embodiments, the fresh air unit has a first operating mode and a second operating mode that can be switched between each other. In the first operating mode, the first return air inlet, the heat exchange core, and the return air outlet are fluidly connected. In the second operating mode, the second return air inlet, the heat exchange core, and the return air outlet are fluidly connected. The first return air inlet and the second return air inlet are located at different positions, the fluid flow path changes, and the area of ​​the heat exchange core through which fluid passes changes. This allows more area within the heat exchange core to be fully utilized, improving the utilization rate of the heat exchange core, fully leveraging the heat exchange performance of the heat exchange core, increasing the air heat recovery rate, extending the service life of the heat exchange core, and improving air quality. Attached Figure Description

[0045] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this application, illustrate exemplary embodiments of this disclosure and are used to explain this disclosure, but do not constitute an undue limitation of this disclosure. In the drawings:

[0046] Figure 1 This is a three-dimensional structural diagram of a fresh air unit provided according to some embodiments of the present disclosure after the top wall of the housing has been removed, in a first operating mode.

[0047] Figure 2 This is a three-dimensional structural diagram of a fresh air unit provided according to some embodiments of the present disclosure after the top wall of the housing has been removed, in a second operating mode.

[0048] Figure 3 This is a schematic diagram of a fresh air unit after the top wall of the casing has been removed, according to some embodiments of this disclosure;

[0049] Figure 4This is a top view of a fresh air unit provided according to some embodiments of the present disclosure after the top wall of the housing has been removed, in a first operating mode.

[0050] Figure 5 This is a top view of a fresh air unit provided according to some embodiments of the present disclosure after the top wall of the housing has been removed, in a second operating mode.

[0051] Figure 6 This is a three-dimensional structural schematic diagram of a heat exchange core provided according to some embodiments of the present disclosure;

[0052] Figure 7 This is a side view of the location of the heat exchange core of a fresh air unit according to some embodiments of the present disclosure.

[0053] The labels in the attached diagram are explained as follows:

[0054] 1-Shell; 11-First sidewall; 12-Second sidewall; 13-Top wall; 14-Bottom wall;

[0055] 21-Fresh air inlet; 22-Fresh air outlet;

[0056] 31-First return air inlet; 32-Second return air inlet; 33-Return air outlet;

[0057] 4-Heat exchange core; 41-First side surface; 42-Second side surface; 43-Third side surface; 44-Fourth side surface;

[0058] 51 - First adjusting plate; 52 - Second adjusting plate;

[0059] 61-First cavity; 611-First partition cavity; 612-Second partition cavity; 613-Third partition cavity; 614-Fourth partition cavity;

[0060] 62-Second cavity; 621-First upper cavity; 622-Second upper cavity; 623-First lower cavity; 624-Second lower cavity;

[0061] 63-Third cavity; 631-Fifth partition cavity; 632-Sixth partition cavity;

[0062] 71-First partition; 72-Second partition; 73-Third partition; 74-Fourth partition; 75-Fifth partition; 76-Sixth partition;

[0063] 81 - First Channel; 82 - Second Channel; 83 - Third Channel; 84 - Fourth Channel; 85 - Fifth Channel; 86 - Sixth Channel;

[0064] 91 - First fan; 92 - Second fan.

[0065] It should be understood that the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Furthermore, the same or similar reference numerals denote the same or similar components. Detailed Implementation

[0066] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0067] The terms "first," "second," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0068] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or 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 intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0069] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0070] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0071] Figure 1 and Figure 2 This is a structural schematic diagram of some embodiments of the fresh air unit according to this disclosure. (See reference) Figure 1and Figure 2 In some embodiments, the fresh air unit includes a housing 1 and a heat exchange core 4. The fresh air unit has a first operating mode and a second operating mode that can be switched between each other.

[0072] refer to Figure 3 The casing 1 is provided with a fresh air inlet 21 and a return air outlet 33 connecting to the outside, as well as a first return air inlet 31, a second return air inlet 32, and a fresh air outlet 22 connecting to the inside. The first return air inlet 31 and the second return air inlet 32 ​​are located in different positions. The heat exchange core 4 is located inside the casing 1.

[0073] refer to Figure 1 and Figure 4 In the first working mode, the first return air inlet 31, heat exchange core 4 and return air outlet 33 are fluidly connected, while the fresh air inlet 21, heat exchange core 4 and fresh air outlet 22 are fluidly connected.

[0074] refer to Figure 2 and Figure 5 In the second working mode, the second return air inlet 32, heat exchange core 4 and return air outlet 33 are fluidly connected, while the fresh air inlet 21, heat exchange core 4 and fresh air outlet 22 are fluidly connected.

[0075] In some related technologies, the duct configuration of fresh air systems is fixed, generally a parallel flow structure or a crossflow structure. Fresh air and return air, two fluids at different temperatures, flow through different layers of the heat exchange core to achieve heat recovery between the two fluids. If the contact surface of the two fluids through the heat exchange core remains unchanged, the utilized area of ​​the heat exchange core is also fixed. This leads to the full utilization of the areas of the heat exchange core where fluid passes through, while the areas where no fluid passes through have low utilization rates. Consequently, the heat exchange utilization rate of the heat exchange core is low, and the heat recovery efficiency is poor. Furthermore, with heat exchange following the same flow path for a long time, the areas of the heat exchange core where fluid passes through are prone to dirt and blockage, resulting in a decrease in return air volume and fresh air volume, reducing ambient air quality, and causing a gradual decline in thermal performance.

[0076] Based on this, the fresh air unit provided in this embodiment has a first working mode and a second working mode that can be switched between each other. In the first working mode, the first return air inlet 31, the heat exchange core 4, and the return air outlet 33 are fluidly connected. In the second working mode, the second return air inlet 32, the heat exchange core 4, and the return air outlet 33 are fluidly connected. The first return air inlet 31 and the second return air inlet 32 ​​are located at different positions, the fluid flow path changes, and the area through which fluid passes in the heat exchange core 4 changes. This allows more area within the heat exchange core 4 to be fully utilized, improving the utilization rate of the heat exchange core 4. It can fully utilize the heat exchange performance of the heat exchange core 4, improve the air heat recovery rate, solve the problems of uneven heat exchange and low heat exchange utilization rate of the heat exchange core 4, extend the service life of the heat exchange core 4, ensure equal heat exchange for fresh air volume and return air volume, have high heat recovery efficiency, and improve air quality.

[0077] In some embodiments, a filter is provided at the location of both the first return air inlet 31 and the second return air inlet 32, and a filter is provided at each of the two return air inlets, thereby extending the service life and replacement cycle of the two filters.

[0078] In some embodiments, the first return air inlet 31 and the second return air inlet 32 ​​are configured to be used selectively.

[0079] In some related technologies, the fresh air unit only includes one return air inlet, and both the return air inlet and the fresh air outlet are located on the indoor side. When installing the fresh air unit, since the positions of the return air inlet and the fresh air outlet are fixed, and the return air inlet and the fresh air outlet need to be connected to the return air duct and the fresh air duct respectively, and due to decoration interference, the positions of the return air duct and the fresh air duct connection have been reserved and cannot be changed, there may be a situation where the air duct needs to be lengthened, and the fresh air duct and the return air duct are arranged in a cross pattern. However, the lengthening of the duct increases the number of bends, the friction resistance and local resistance increase, the noise increases, the pressure loss of fresh air and return air becomes uncontrollable, and the heat exchange efficiency of fresh air is seriously affected.

[0080] Based on this, the fresh air unit provided in this embodiment includes a first return air inlet 31 and a second return air inlet 32. When installing the fresh air unit, the first return air inlet 31 or the second return air inlet 32 ​​can be selected to connect the return air duct according to the decoration space. The duct position can be freely adjusted according to the engineering installation, which meets the requirements of the engineering site to install ducts according to the fresh air outlet and the return air inlet, realize the duct layout without crossing, is easy to operate, has simple pipeline with low resistance, is easy to install, and improves heat exchange efficiency.

[0081] For example: Figure 1In the embodiment shown, a first return air inlet 31 is provided on the left side of the fresh air outlet 22, and a second return air inlet 32 ​​is provided on the right side of the fresh air outlet 22. If the indoor return air inlet is on the left side, the unit is connected to the first return air inlet 31 in a parallel flow pipe manner. If the indoor return air inlet is on the right side, the unit is connected to the second return air inlet 32 ​​in a cross flow pipe manner. Therefore, the duct position can be freely adjusted according to the engineering installation to improve heat exchange efficiency.

[0082] With indoor return air inlets on both the left and right sides, the first and second operating modes of the fresh air unit can be freely switched to improve heat exchange efficiency.

[0083] In some embodiments, the fresh air outlet 22 is located between the first return air inlet 31 and the second return air inlet 32.

[0084] In some embodiments, the first return air inlet 31 and the return air outlet 33 are generally on the same straight line, and the second return air inlet 32 ​​and the fresh air inlet 21 are generally on the same straight line.

[0085] refer to Figure 4 In the first working mode, the first return air inlet 31 is fluidly connected to the return air outlet 33, and the fresh air inlet 21 is fluidly connected to the fresh air outlet 22. The flow of fresh air and return air is similar to that of parallel flow.

[0086] refer to Figure 5 In the second working mode, the second return air inlet 32 ​​is fluidly connected to the return air inlet 33, and the fresh air inlet 21 is fluidly connected to the fresh air outlet 22. The flow of fresh air and return air is similar to a cross-flow.

[0087] refer to Figure 3 In some embodiments, the fresh air unit also includes a first regulating plate 51 for opening or closing the first return air inlet 31, and a second regulating plate 52 for opening or closing the second return air inlet 32.

[0088] In some embodiments, the fresh air unit includes a first stepper motor, which is driven to connect to a first adjusting plate 51 so that the first adjusting plate 51 rotates clockwise or counterclockwise to open or close the first return air inlet 31.

[0089] In some embodiments, the fresh air unit includes a second stepper motor, which is driven to connect to the second adjusting plate 52 so that the second adjusting plate 52 rotates clockwise or counterclockwise to open or close the second return air inlet 32.

[0090] In such Figure 3In the embodiment shown, the first adjusting plate 51 rotates clockwise to close the first return air inlet 31, and the second adjusting plate 52 rotates clockwise to open the second return air inlet 32. When the second adjusting plate 52 moves to the vertical position, the resulting return air duct is as follows: Figure 5 As shown, the unit operates in a crossflow configuration; the first regulating plate 51 rotates counterclockwise to open the first return air inlet 31, the second regulating plate 52 rotates counterclockwise to close the second return air inlet 32, and the first regulating plate 51 moves to the vertical position, forming a return air duct as shown. Figure 4 The unit operates in parallel flow.

[0091] In some embodiments, the housing 1 includes a first sidewall 11 and a second sidewall 12 disposed opposite to each other, a first return air inlet 31, a second return air inlet 32 ​​and a fresh air outlet 22 are disposed on the first sidewall 11, and a fresh air inlet 21 and a return air outlet 33 are disposed on the second sidewall 12.

[0092] In some embodiments, a first cavity 61, a second cavity 62 and a third cavity 63 are sequentially provided between the first sidewall 11 and the second sidewall 12 inside the housing 1, and the heat exchange core 4 is disposed in the second cavity 62.

[0093] In some embodiments, the fresh air unit includes a first adjusting plate 51 and a second adjusting plate 52.

[0094] refer to Figure 1 and Figure 4 In the first working mode, the first regulating plate 51 opens the first return air inlet 31 and divides the first cavity 61 into a first partition cavity 611 and a second partition cavity 612. The first return air inlet 31 is located in the first partition cavity 611, the second return air inlet 32 ​​and the fresh air outlet 22 are located in the second partition cavity 612, and the second regulating plate 52 closes the second return air inlet 32.

[0095] refer to Figure 2 and Figure 5 In the second working mode, the first regulating plate 51 closes the first return air inlet 31, the second regulating plate 52 opens the second return air inlet 32, and divides the first cavity 61 into a third partition cavity 613 and a fourth partition cavity 614. The first return air inlet 31 and the fresh air outlet 22 are located in the third partition cavity 613, and the second return air inlet 32 ​​is located in the fourth partition cavity 614.

[0096] refer to Figure 1 and Figure 2 In some embodiments, the fresh air unit further includes a first partition 71, a second partition 72, and a third partition 73 located between the first cavity 61 and the second cavity 62. The first partition 71 and the third partition 73 are movable vertically.

[0097] refer to Figure 1In the first working mode, a first channel 81 is formed above the first partition 71, and the first channel 81 connects the upper part of the first partition cavity 611 and the second cavity 62; a second channel 82 is formed below the second partition 72 and the third partition 73, and the second channel 82 connects the lower part of the second partition cavity 612 and the second cavity 62; in the height direction, the first channel 81 is located above the second channel 82.

[0098] refer to Figure 2 In the second working mode, a third channel 83 is formed below the first partition 71 and the second partition 72, and the third channel 83 connects the lower part of the third partition cavity 613 and the second cavity 62; a fourth channel 84 is formed above the third partition 73, and the fourth channel 84 connects the upper part of the fourth partition cavity 614 and the second cavity 62; in the height direction, the third channel 83 is located below the fourth channel 84.

[0099] The first partition 71 and the third partition 73 can move up and down.

[0100] refer to Figure 1 In the first working mode, the first partition 71 descends, forming a first channel 81 above the first partition 71, and the third partition 73 rises, forming a second channel 82 below the third partition 73 and the second partition 72.

[0101] refer to Figure 2 In the second working mode, the first partition 71 rises, and the lower parts of the first partition 71 and the second partition 72 together form the third channel 83. The third partition 83 falls, and the upper part of the third partition 83 forms the fourth channel 84.

[0102] In some embodiments, the fresh air unit further includes a fourth partition 74 and a fifth partition 75 located between the second cavity 62 and the third cavity 63; and a sixth partition 76 disposed in the third cavity 63.

[0103] refer to Figure 1 and Figure 2 The sixth partition 76 divides the third cavity 63 into the fifth partition cavity 631 and the sixth partition cavity 632. The return air outlet 33 is located in the fifth partition cavity 631, and the fresh air inlet 21 is located in the sixth partition cavity 632.

[0104] A fifth channel 85 is formed below the fourth partition 74, and a sixth channel 86 is formed above the fifth partition 75. The fifth channel 85 connects the lower part of the second cavity 62 and the fifth partition cavity 631, and the sixth channel 86 connects the upper part of the second cavity 62 and the sixth partition cavity 632. In the vertical direction, the fifth channel 85 is located below the sixth channel 85.

[0105] refer to Figure 1 , Figure 2 and Figure 7In some embodiments, the heat exchange core 4 divides the upper part of the second cavity 62 into a first upper cavity 621 and a second upper cavity 622, and divides the lower part of the second cavity 62 into a first lower cavity 623 and a second lower cavity 624; the first upper cavity 621 and the first lower cavity 623 are close to the first cavity 61, and the second upper cavity 622 and the second lower cavity 624 are close to the third cavity 63.

[0106] refer to Figure 1 In the first working mode, the first return air inlet 31, the first upper chamber 621, the heat exchange core 4, the second lower chamber 624 and the return air outlet 33 are in fluid communication, while the fresh air inlet 21, the second upper chamber 622, the heat exchange core 4, the first lower chamber 623 and the fresh air outlet 22 are in fluid communication.

[0107] refer to Figure 2 In the second working mode, the second return air inlet 32, the first upper chamber 621, the heat exchange core 4, the second lower chamber 624 and the return air outlet 33 are in fluid communication, while the fresh air inlet 21, the second upper chamber 622, the heat exchange core 4, the first lower chamber 623 and the fresh air outlet 22 are in fluid communication.

[0108] refer to Figure 6 and Figure 7 In some embodiments, the heat exchange core 4 includes a first side 41, a second side 42, a third side 43 and a fourth side 44 connected in sequence to form a closed loop; the first side 41 is located in the first upper cavity 621, the second side 42 is located in the second upper cavity 622, the third side 43 is located in the second lower cavity 624, and the fourth side 44 is located in the first lower cavity 623.

[0109] refer to Figure 7 The housing 1 includes a top wall 13 and a bottom wall 14. The top of the heat exchange core 4 mates with the top wall 13 to divide the upper part of the second cavity 62 into a first upper cavity 621 and a second upper cavity 622. The bottom of the heat exchange core 4 mates with the bottom wall 14 to divide the lower part of the second cavity 62 into a first lower cavity 623 and a second lower cavity 624. The direction from the bottom wall 14 to the top wall 13 is parallel to the height direction.

[0110] refer to Figure 6 The return air in the first upper chamber 621 enters the heat exchange core 4 from the first side 41, and then flows out from the third side 43, entering the second lower chamber 624. The fresh air in the second upper chamber 622 enters the heat exchange core 4 from the second side 42, and then flows out from the fourth side 44, entering the first lower chamber 623.

[0111] In some embodiments, the fresh air unit further includes a first fan 91 and a second fan 92.

[0112] The first fan 91 is located at the fresh air outlet 22 and is connected to the fresh air outlet 22.

[0113] The second fan 92 is located at the return air outlet 33 and is connected to the return air outlet 33.

[0114] Both the first fan 91 and the second fan 92 are suction-type fans.

[0115] refer to Figure 1 In some specific embodiments, the airflow path between the fresh air and return air in the first operating mode of the fresh air unit is as follows:

[0116] The indoor return air enters the first partition chamber 611 through the first return air inlet 31, then enters the first upper chamber 621 through the first channel 81, then enters the heat exchange core 4 through the first side 41, enters the second lower chamber 624 through the third side 43 of the heat exchange core 4, then enters the fifth partition chamber 631 through the fifth channel 85, and finally is discharged to the outside through the return air outlet 33.

[0117] Outdoor fresh air enters the sixth partition chamber 632 through the fresh air inlet 21, then enters the second upper chamber 622 through the sixth channel 86, enters the heat exchange core 4 through the second side 42, enters the first lower chamber 623 through the fourth side 44, then enters the second partition chamber 612 through the second channel 82, and finally enters the room through the fresh air outlet 22.

[0118] refer to Figure 2 In some specific embodiments, the airflow path for fresh air and return air in the second operating mode of the fresh air unit is as follows:

[0119] The indoor return air enters the fourth partition chamber 614 through the second return air inlet 32, then enters the first upper chamber 621 through the fourth channel 84, then enters the heat exchange core 4 through the first side 41 of the heat exchange core 4, enters the second lower chamber 624 through the third side 43 of the heat exchange core 4, then enters the fifth partition chamber 631 through the fifth channel 85, and finally is discharged to the outside through the return air outlet 33.

[0120] Outdoor fresh air enters the sixth partition chamber 632 through the fresh air inlet 21, then enters the second upper chamber 622 through the sixth channel 86, enters the heat exchange core 4 through the second side 42, enters the first lower chamber 623 through the fourth side 44, then enters the third partition chamber 613 through the third channel 83, and finally enters the room through the fresh air outlet 22.

[0121] Some embodiments also provide a method for controlling a fresh air unit, which includes the following steps:

[0122] refer to Figure 1When the first working mode of the fresh air unit is selected, the indoor air flows to the outside through the first return air inlet 31, the heat exchange core 4 and the return air outlet 33 in sequence; at the same time, the outdoor fresh air flows to the indoor air through the fresh air inlet 21, the heat exchange core 4 and the fresh air outlet 22 in sequence.

[0123] refer to Figure 2 When the second working mode of the fresh air unit is selected, the indoor air flows to the outside through the second return air inlet 32, the heat exchange core 4 and the return air outlet 33 in sequence; at the same time, the outdoor fresh air flows to the indoor air through the fresh air inlet 21, the heat exchange core 4 and the fresh air outlet 22 in sequence.

[0124] In some embodiments, the fresh air outlet 22 is located between the first return air inlet 31 and the second return air inlet 32; the first return air inlet 31 and the return air outlet 33 are generally on the same straight line, and the second return air inlet 32 ​​and the fresh air inlet 21 are generally on the same straight line.

[0125] Since the heat exchange efficiency of the first and second working modes of the fresh air unit is affected by factors such as the length of the ductwork during engineering installation, local resistance, and operating wind speed, the heat exchange efficiency of the two working modes is different. The specific operating mode should be selected according to the actual heat recovery benefits during operation.

[0126] Therefore, the control method for fresh air units also includes performing the following checks before the fresh air unit is first put into operation:

[0127] The fresh air unit operates in the first working mode for a first preset time. The heat exchange efficiency is calculated once every second preset time within the first preset time period. The heat exchange efficiency is calculated n times in total, and the average value of the n heat exchange efficiencies is taken as the heat exchange efficiency η1 of the fresh air unit in the first working mode.

[0128] The fresh air unit operates in the second working mode for a first preset time. The heat exchange efficiency is calculated once every second preset time within the first preset time period. The heat exchange efficiency is calculated n times in total, and the average value of the n heat exchange efficiencies is taken as the heat exchange efficiency η2 of the fresh air unit in the second working mode.

[0129] When η2≥η1, the fresh air unit operates in the second working mode; and after running for a preset cycle, the fresh air unit is re-inspected.

[0130] When η2 < η1, the fresh air unit operates in the first working mode; and after running for a preset cycle, the fresh air unit is re-inspected.

[0131] In some embodiments, the control method for the fresh air unit further includes the following steps:

[0132] During a cycle in which the fresh air system operates in the first operating mode, if any of the following conditions exist, the fresh air system will switch from the first operating mode to the second operating mode:

[0133] Operating conditions changed from -20℃ < T xj The change at ≤-10℃ is T xj >-10℃, |T xj -T pj |≥3℃, and φ xj ≤50%;

[0134] Operating conditions are determined by T xj >10℃ and φ xj >50% change is T xj >-10℃, |T xj -T pj |≥3℃, and φ xj ≤50%;

[0135] Operating conditions from -25℃ ≤ T xj The change at ≤-20℃ is T xj >-10℃, |T xj -T pj |≥3℃, and φ xj ≤50%.

[0136] Among them, T xj T represents the fresh air intake temperature at the fresh air inlet. pj φ is the return air inlet temperature; xj The relative humidity of the fresh air intake.

[0137] In some embodiments, the actual installation of the unit is affected by the length and bends of the fresh air duct and return air duct, which may cause the duct resistance to not match the rated resistance on the nameplate of the actual unit. The duct resistance affects the air velocity of the fresh air and exhaust air, which in turn leads to changes in heat exchange efficiency. Therefore, the operating mode should be verified during the first operation, and the operating mode with higher heat exchange efficiency should be selected based on the verification results.

[0138] Test 1: Parallel flow operation mode: The first regulating plate 51 opens the first return air inlet 31, and the second regulating plate 52 closes the second return air inlet 32. The system runs continuously for 6 hours according to the first working mode. During the 6 hours of continuous operation, the heat exchange efficiency is calculated every 0.5 hours. The heat exchange efficiency is calculated 12 times in total, and the average value is taken as the average total heat exchange efficiency η1 of the parallel flow heat operation mode.

[0139] Test 2: Crossflow operation mode: The second regulating plate 52 opens the second return air inlet 32, and the first regulating plate 51 closes the first return air inlet 31. The system runs continuously for 6 hours according to the second working mode. During the 6 hours of continuous operation, the heat exchange efficiency is calculated every 0.5 hours. The heat exchange efficiency is calculated 12 times in total, and the average value is taken as the average total heat exchange efficiency η2 of the crossflow thermal operation mode.

[0140] If η2≥η1, the equipment operates in cross-flow mode, and a total of 30 days of operation is counted as one operating cycle. The equipment is then re-inspected according to the operating mode.

[0141] If η2 < η1, the equipment operates in parallel flow mode, and a total of 30 days of operation is counted as one operating cycle. The equipment is then re-inspected according to the operating mode.

[0142] The motor drives the rotation of the first adjusting plate 51 and the second adjusting plate 52. The first adjusting plate 51 opens the first return air inlet 31; the second adjusting plate 52 closes the second return air inlet 32. The motor drives the air duct partition to move, forming a parallel flow of fresh air and return air between the cores.

[0143] The motor drives the rotation of the first adjusting plate 51 and the second adjusting plate 52. The first adjusting plate 51 closes the first return air inlet 31; the second adjusting plate 52 opens the second return air inlet 32. The motor drives the air duct baffle to move, forming a cross flow of fresh air and return air between the cores.

[0144] When the fresh air unit is operating in the first working mode, if any of the following conditions are met, the unit will switch from the first working mode to the second working mode.

[0145] 1) Operating conditions changed from -20℃ < T xj The change at ≤-10℃ is T xj >-10℃, and |T xj -T pj |≥3℃ and φ xj ≤50%;

[0146] 2) Operating conditions are determined by T xj >10℃ and φ xj >50% change is T xj >-10℃, and |T xj -T pj |≥3℃ and φ xj ≤50%;

[0147] 3) Operating conditions from -25℃ ≤ T xj The change at ≤-20℃ is T xj >-10℃, and |T xj -T pj |≥3℃ and φ xj ≤50%.

[0148] Among them, T xj T represents the fresh air intake temperature. pj φ is the return air intake temperature; xj The relative humidity of the incoming fresh air.

[0149] Additionally, parameters that can be considered include: φ xcThe relative humidity of the fresh air supply; φ pj The relative humidity of the return air and intake air; T xc T represents the temperature of the fresh air outlet. pc This refers to the return air and outlet air temperatures.

[0150] Based on the embodiments disclosed above, in the absence of explicit denial or conflict, the technical features of one embodiment may be advantageously combined with one or more other embodiments.

[0151] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A fresh air ventilator, characterized in that, include: The housing (1) is provided with a fresh air inlet (21) and a return air outlet (33) connecting to the outside, and a first return air inlet (31), a second return air inlet (32), and a fresh air outlet (22) connecting to the inside. The first return air inlet (31) and the second return air inlet (32) are located at different positions. The fresh air outlet (22) is located between the first return air inlet (31) and the second return air inlet (32). The first return air inlet (31) and the return air outlet (33) are generally on the same straight line, and the second return air inlet (32) and the fresh air inlet (21) are generally on the same straight line. as well as The heat exchange core (4) is disposed inside the housing (1); The fresh air system has a first working mode and a second working mode that can be switched between each other. In the first working mode, the first return air inlet (31), the heat exchange core (4) and the return air outlet (33) are in fluid communication, while the fresh air inlet (21), the heat exchange core (4) and the fresh air outlet (22) are in fluid communication. In the second working mode, the second return air inlet (32), the heat exchange core (4) and the return air outlet (33) are in fluid communication, while the fresh air inlet (21), the heat exchange core (4) and the fresh air outlet (22) are in fluid communication.

2. The fresh air system as described in claim 1, characterized in that, It also includes a first regulating plate (51) for opening or closing the first return air inlet (31), and a second regulating plate (52) for opening or closing the second return air inlet (32).

3. The fresh air system as described in claim 1, characterized in that, The housing (1) includes a first sidewall (11) and a second sidewall (12) disposed opposite to each other. The first return air inlet (31), the second return air inlet (32) and the fresh air outlet (22) are disposed on the first sidewall (11), and the fresh air inlet (21) and the return air outlet (33) are disposed on the second sidewall (12).

4. The fresh air system as described in claim 3, characterized in that, The first sidewall (11) and the second sidewall (12) inside the housing (1) are provided with a first cavity (61), a second cavity (62) and a third cavity (63) in sequence, and the heat exchange core (4) is disposed in the second cavity (62).

5. The fresh air system as described in claim 4, characterized in that, It includes a first adjusting plate (51) and a second adjusting plate (52); In the first working mode, the first regulating plate (51) opens the first return air inlet (31) and divides the first cavity (61) into a first partition cavity (611) and a second partition cavity (612). The first return air inlet (31) is located in the first partition cavity (611), the second return air inlet (32) and the fresh air outlet (22) are located in the second partition cavity (612), and the second regulating plate (52) closes the second return air inlet (32). In the second working mode, the first regulating plate (51) closes the first return air inlet (31), the second regulating plate (52) opens the second return air inlet (32), and divides the first cavity (61) into a third partition cavity (613) and a fourth partition cavity (614). The first return air inlet (31) and the fresh air outlet (22) are located in the third partition cavity (613), and the second return air inlet (32) is located in the fourth partition cavity (614).

6. The fresh air system as described in claim 5, characterized in that, It also includes a first partition (71), a second partition (72) and a third partition (73) located between the first cavity (61) and the second cavity (62); In the first working mode, a first channel (81) is formed above the first partition (71), and the first channel (81) connects the upper part of the first partition cavity (611) and the second cavity (62); a second channel (82) is formed below the second partition (72) and the third partition (73), and the second channel (82) connects the lower part of the second partition cavity (612) and the second cavity (62); in the height direction, the first channel (81) is located above the second channel (82); In the second working mode, a third channel (83) is formed below the first partition (71) and the second partition (72), the third channel (83) connecting the lower part of the third partition cavity (613) and the second cavity (62); a fourth channel (84) is formed above the third partition (73), the fourth channel (84) connecting the upper part of the fourth partition cavity (614) and the second cavity (62); in the height direction, the third channel (83) is located below the fourth channel (84).

7. The fresh air system as described in claim 4, characterized in that, It also includes a fourth partition (74) and a fifth partition (75) located between the second cavity (62) and the third cavity (63), and a sixth partition (76) disposed in the third cavity (63); the sixth partition (76) divides the third cavity (63) into a fifth partition cavity (631) and a sixth partition cavity (632), the return air outlet (33) is located in the fifth partition cavity (631), and the fresh air inlet (21) is located in the sixth partition cavity (632); a fifth channel (85) is formed below the fourth partition (74), and a sixth channel (86) is formed above the fifth partition (75), the fifth channel (85) connects the lower part of the second cavity (62) and the fifth partition cavity (631), and the sixth channel (86) connects the upper part of the second cavity (62) and the sixth partition cavity (632), and in the height direction, the fifth channel (85) is located below the sixth channel (86).

8. The fresh air system as described in claim 4, characterized in that, The heat exchange core (4) divides the upper part of the second cavity (62) into a first upper cavity (621) and a second upper cavity (622), and divides the lower part of the second cavity (62) into a first lower cavity (623) and a second lower cavity (624); the first upper cavity (621) and the first lower cavity (623) are close to the first cavity (61), and the second upper cavity (622) and the second lower cavity (624) are close to the third cavity (63); In the first working mode, the first return air inlet (31), the first upper cavity (621), the heat exchange core (4), the second lower cavity (624) and the return air outlet (33) are in fluid communication, while the fresh air inlet (21), the second upper cavity (622), the heat exchange core (4), the first lower cavity (623) and the fresh air outlet (22) are in fluid communication; In the second working mode, the second return air inlet (32), the first upper cavity (621), the heat exchange core (4), the second lower cavity (624) and the return air outlet (33) are in fluid communication, while the fresh air inlet (21), the second upper cavity (622), the heat exchange core (4), the first lower cavity (623) and the fresh air outlet (22) are in fluid communication.

9. The fresh air system as described in claim 8, characterized in that, The heat exchange core (4) includes a first side (41), a second side (42), a third side (43) and a fourth side (44) connected in sequence to form a closed loop; the first side (41) is located in the first upper cavity (621), the second side (42) is located in the second upper cavity (622), the third side (43) is located in the second lower cavity (624), and the fourth side (44) is located in the first lower cavity (623).

10. The fresh air system as described in claim 1, characterized in that, Also includes: The first fan (91) is located at the fresh air outlet (22) and is connected to the fresh air outlet (22); as well as The second fan (92) is located at the return air outlet (33) and is connected to the return air outlet (33).

11. The fresh air system as described in claim 1, characterized in that, The first return air inlet (31) and the second return air inlet (32) are configured to be used selectively.

12. A method for controlling a fresh air unit as described in any one of claims 1 to 11, comprising the following steps: When the first working mode of the fresh air unit is selected, the indoor air flows to the outside through the first return air inlet (31), the heat exchange core (4) and the return air outlet (33) in sequence; at the same time, the outdoor fresh air flows to the indoor air through the fresh air inlet (21), the heat exchange core (4) and the fresh air outlet (22) in sequence. When the second working mode of the fresh air unit is selected, the indoor air flows to the outside through the second return air inlet (32), the heat exchange core (4) and the return air outlet (33) in sequence; at the same time, the outdoor fresh air flows to the indoor air through the fresh air inlet (21), the heat exchange core (4) and the fresh air outlet (22) in sequence.

13. The control method for a fresh air unit as described in claim 12 further includes the following steps: Before the fresh air system is put into operation for the first time, the following tests should be performed: The fresh air unit operates in the first working mode for a first preset time. The heat exchange efficiency is calculated once every second preset time within the first preset time period. The heat exchange efficiency is calculated n times in total, and the average value of the n heat exchange efficiencies is taken as the heat exchange efficiency η1 of the fresh air unit in the first working mode. The fresh air unit operates in the second working mode for a first preset time. The heat exchange efficiency is calculated once every second preset time within the first preset time period. The heat exchange efficiency is calculated n times in total, and the average value of the n heat exchange efficiencies is taken as the heat exchange efficiency η2 of the fresh air unit in the second working mode. When η2≥η1, the fresh air unit operates in the second working mode; and after running for a preset cycle, the fresh air unit is re-inspected. When η2 < η1, the fresh air unit operates in the first working mode; and after running for a preset cycle, the fresh air unit is re-inspected.

14. The control method for a fresh air unit as described in claim 13 further includes the following steps: During a cycle in which the fresh air system operates in the first operating mode, if any of the following conditions exist, the fresh air system will switch from the first operating mode to the second operating mode: Operating conditions changed from -20℃ < T xj The change at ≤-10℃ is T xj >-10℃, |T xj -T pj |≥3℃, and φ xj ≤50%; Operating conditions are determined by T xj >10℃ and φ xj >50% change is T xj >-10℃, |T xj -T pj |≥3℃, and φ xj ≤50%; Operating conditions from -25℃ ≤ T xj The change at ≤-20℃ is T xj >-10℃, |T xj -T pj |≥3℃, and φ xj ≤50%; Among them, T xj T represents the fresh air intake temperature at the fresh air inlet. pj φ is the return air inlet temperature; xj The relative humidity of the fresh air intake.

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