EP4696944A1

EP4696944A1 - Fresh air fan and electric control box

Info

Publication number: EP4696944A1
Application number: EP23934979.8A
Authority: EP
Inventors: Junwei Chen; Yu Li; Zhihai ZHU; Yanrong Li
Original assignee: GD Midea Air Conditioning Equipment Co Ltd; Midea Group Wuhan HVAC Equipment Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd; Midea Group Wuhan HVAC Equipment Co Ltd
Priority date: 2023-04-28
Filing date: 2023-10-31
Publication date: 2026-02-18
Also published as: WO2024221811A1

Abstract

Provided in the embodiments of the present application are a fresh air fan and an electric control box. The fresh air fan comprises a casing assembly and an electric control box; the casing assembly comprises a casing and a cover plate; the casing is provided with an accommodation chamber and an opening, a first air inlet and a first air outlet which communicate with the accommodation chamber; the accommodation chamber is internally provided with an exchange core mounting space, an air passage and an electric control box mounting space, the air passage being located between the first air inlet and the exchange core mounting space; a first airflow path passing through the air passage and the exchange core mounting space is formed between the first air inlet and the first air outlet; the electric control box mounting space is located on the side of the air passage close to the opening; the cover plate covers the opening; and the electric control box is arranged inside the electric control box mounting space.

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Chinese Patent Application No. 2023210282066, filed on April 28, 2023 , and Chinese Patent Application No. 2023105036282, filed on April 28, 2023 , the entire contents of which are incorporated herein by reference.

FIELD

The present disclosure relates to the field of air conditioning technology, and in particular to a fresh air unit and an electronic control box.

BACKGROUND

A fresh air unit is an air handling device primarily used to introduce fresh outdoor air into indoor spaces and exhaust stale indoor air to the outdoors.
In the related art, due to the limited space inside the housing of the fresh air unit, the electronic control box of the fresh air unit is typically installed externally. The external placement of the electronic control box results in a bulky appearance, leading to relatively large overall dimensions and packaging size of the fresh air unit, which not only occupies more installation space but also increases packaging costs.

SUMMARY

The present disclosure aims to solve at least one of the technical problems in the existing technology to some extent.
To this end, the present disclosure provides a fresh air unit and an electronic control box. There is provided a fresh air unit, including:

a housing assembly, the housing assembly including a housing and a cover plate, the housing being provided with an accommodation cavity, an opening communicating with the accommodation cavity, a first air inlet, and a first air outlet, the accommodation cavity including a heat exchange core installation space, an air duct, and an electronic control box installation space, the air duct being located between the first air inlet and the heat exchange core installation space, a first airflow path passing through the air duct and the heat exchange core installation space being formed between the first air inlet and the first air outlet, the electronic control box installation space being located on a side of the air duct close to the opening, and the cover plate being mounted at the opening; and
an electronic control box, the electronic control box being arranged in the electronic control box installation space.

In an embodiment, the housing assembly includes a partition member located in the accommodation cavity, the partition member being arranged between the first air inlet and the heat exchange core installation space to separate and define the electronic control box installation space and the air duct.
In an embodiment, the partition member includes a first wall and two second walls respectively arranged on opposite sides of the first wall, the first wall, the two second walls, and the housing together enclose to form the air duct, and the electronic control box installation space is located on a side of the first wall facing away from the air duct.
In an embodiment, the fresh air unit further includes a first sealing member located between the partition member and the electronic control box; and/or
the fresh air unit further includes a second sealing member, the electronic control box being provided with a first wire passage port, a side wall of the housing being provided with a second wire passage port communicating with the first wire passage port, the second sealing member being sandwiched between a side wall of the electronic control box provided with the first wire passage port and a side wall of the housing provided with the second wire passage port.
In an embodiment, at least one of the two second walls is provided with a side edge on a side close to the first air inlet bent to form a first flange that fits against a side wall of the housing provided with the first air inlet; and/or

a side edge of the first wall on a side close to the first air inlet is bent to form a second flange that fits against the side wall of the housing provided with the first air inlet; and/or
one of the two second walls is bent toward an exterior of the partition member to form a fan connection edge.

In an embodiment, the two second walls are respectively provided with the first flanges bent toward a side close to each other, and side edges of the two first flanges close to each other are bent toward the interior of the partition member, such that a filter installation slot is formed between the two first flanges.
In an embodiment, the first wall is provided with a filter installation port communicating with the filter installation slot; and/or
the first wall is provided with a filter installation port communicating with the filter installation slot, and a spacing between the two first flanges gradually decreases from a side close to the filter installation port toward a side away from the filter installation port.
In an embodiment, the fresh air unit further includes a filter and a filter partition plate, where the filter partition plate is arranged on a side of the electronic control box close to the first air inlet, and the filter partition plate is mounted with a clearance from at least a partial area of the electronic control box, such that a filter installation space communicating with the filter installation slot is formed at the clearance, and the filter is inserted into the filter installation slot through the filter installation space, with a partial area of the filter located in the filter installation space.
In an embodiment, the electronic control box includes a box body, and a first control assembly and a second control assembly arranged inside the box body, the first control assembly includes a first control board provided with a first component mounting surface, the second control assembly includes a second control board provided with a second component mounting surface, and on a projection plane parallel to the first component mounting surface, a projection of the first component mounting surface and a projection of the second component mounting surface at least partially overlap.
In an embodiment, the electronic control box includes a wiring bracket and a fixing bracket arranged inside the box body, a side of the box body is open to form an open end, and the second control assembly is located on a side of the first control board close to the open end and is connected to the fixing bracket and the wiring bracket, respectively.
In an embodiment, the second control assembly includes an installation box and a support plate, the second control board is arranged inside the installation box, and the support plate is located on a side of the installation box away from the second control board and is connected to the fixing bracket and the wiring bracket, respectively.
In an embodiment, a partial area of one of the support plate and the fixing bracket protrudes to form a first snap-fit protrusion, and a partial area of the other is recessed to form a first snap-fit recess, the first snap-fit protrusion extends into the first snap-fit recess to form a snap-fit connection between the support plate and the fixing bracket; and/or
a partial area of one of the support plate and the wiring bracket protrudes to form a second snap-fit protrusion, and a partial area of the other is recessed to form a second snap-fit recess, the second snap-fit protrusion extends into the second snap-fit recess to form a snap-fit connection between the support plate and the wiring bracket.
In an embodiment, the fixing bracket is provided with a first fastening hole, a partial area of the fixing bracket is bent to a side away from the open end to form a third flange, and on a projection plane parallel to the third flange, a projection of the first fastening hole is located within a projection range of the third flange; and/or

the fixing bracket is arranged on a side wall of the box body; and/or
the support plate is provided with a second fastening hole, the installation box is provided with a third fastening hole, at least partial areas of two adjacent side edges of the support plate are bent toward a side of the support plate to form positioning bent edges, respectively, and the two positioning bent edges fit against two adjacent side walls of the installation box in a one-to-one correspondence, such that the second fastening hole is aligned with the third fastening hole.

In an embodiment, a partial area of the support plate is bent toward a side provided with the positioning bent edges to form a fourth flange provided with the second fastening hole.
In an embodiment, on a projection plane parallel to the first component mounting surface, a projection of the wiring bracket is located outside a projection range of the first component mounting surface; and/or

the wiring bracket includes a wiring plate and support feet arranged on opposite sides of the wiring plate, and the support feet are fixed on a bottom wall of the housing; and/or
the wiring bracket is provided with a fourth fastening hole, a partial area of the wiring bracket is bent to a side away from the open end to form a fifth flange, and on a projection plane parallel to the fifth flange, a projection of the fourth fastening hole is located within a projection range of the fifth flange.

In an embodiment, the fresh air unit includes a partition plate arranged inside the accommodation cavity, where

the partition plate at least shields the open end, the box body is provided with a sixth flange located around a periphery of the open end, and the electronic control box further includes a third sealing member arranged between the sixth flange and the partition plate; and/or
the box body is provided with a seventh flange located around the periphery of the open end and formed by bending toward an exterior of the box body, one of the partition plate and the seventh flange is provided with a third snap-fit protrusion, and the other is provided with a third snap-fit recess, and the third snap-fit protrusion extends into the third snap-fit recess to form a snap-fit connection between the partition plate and the box body.

In an embodiment, the box body includes a first side wall and a second side wall arranged adjacent to each other, and a side of the first side wall close to the second side wall covers an outer surface of the second side wall; and/or
the box body includes a second side wall and a third side wall arranged adjacent to each other, a side of the second side wall close to the third side wall is bent to form an eighth flange, and the eighth flange fits against the third side wall.
There is provided an electronic control box, which is the electronic control box of any of the above embodiments.
The embodiments of the present disclosure provide a fresh air unit and an electronic control box. The accommodation cavity of the housing of the fresh air unit includes the heat exchange core installation space, the air duct, and the electronic control box installation space, the air duct being located between the first air inlet and the heat exchange core installation space, the first airflow path passing through the air duct and the heat exchange core installation space being formed between the first air inlet and the first air outlet, and the electronic control box installation space being located on a side of the air duct close to the opening. That is to say, the space between the air duct and the cover plate is utilized to accommodate the electronic control box, so that the electronic control box is built into the accommodation cavity of the housing, which means it is neither externally mounted nor occupies other positions in the accommodation cavity. Thus, the space inside the housing assembly can be fully utilized to reduce the overall size of the fresh air unit, thereby not only reducing the installation space occupied by the fresh air unit but also reducing the packaging size of the fresh air unit, so as to lower the packaging costs of the fresh air unit.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram of a fresh air unit according to an embodiment of the present disclosure, with a partial area of a cover plate open;
FIG. 2 is a schematic diagram of the fresh air unit in FIG. 1 after a partition plate is removed;
FIG. 3 is a schematic diagram of the interior of an accommodation cavity of the fresh air unit in FIG. 1;
FIG. 4 is a schematic diagram of the fresh air unit in FIG. 3 after an electronic control box is removed;
FIG. 5 is a schematic diagram of the electronic control box in FIG. 4;
FIG. 6 is an exploded view of the electronic control box in FIG. 5;
FIG. 7 is a schematic diagram of a second control assembly in FIG. 6;
FIG. 8 is a schematic diagram of a support plate in FIG. 6;
FIG. 9 is a schematic diagram of a wiring bracket in FIG. 6;
FIG. 10 is a schematic diagram of a box body in FIG. 6, showing a fixing bracket;
FIG. 11 is a schematic diagram of the fixing bracket in FIG. 10;
FIG. 12 is a partial enlarged view of area A in FIG. 10;
FIG. 13 is a schematic diagram showing the engagement relationship between a partition member and a first sealing member;
FIG. 14 is a schematic diagram of the partition member; and
FIG. 15 is a front view of the partition member in FIG. 14.

DETAILED DESCRIPTION

An embodiment of the present disclosure provides a fresh air unit. Referring to FIGs. 1 to 3, the fresh air unit includes a housing assembly 10 and an electronic control box 20. The housing assembly 10 includes a housing 11 and a cover plate 12. The housing 11 is provided with an accommodation cavity 11a, an opening 11b, a first air inlet 11c, and a first air outlet 11d. The opening 11b, the first air inlet 11c, and the first air outlet 11d are respectively in communication with the accommodation cavity 11a. The cover plate 12 is mounted at the opening 11b.
The accommodation cavity 11a includes a heat exchange core installation space, an air duct 11aa, and an electronic control box installation space 11ab.
Specifically, the air duct 11aa is located between the first air inlet 11c and the heat exchange core installation space, i.e., the air duct 11aa is located on a side of the accommodation cavity 11a close to the first air inlet 11c. A first airflow path A is formed between the first air inlet 11c and the first air outlet 11d, passing through the air duct 11aa and the heat exchange core installation space. The electronic control box installation space 11ab is located on a side of the air duct 11aa close to the opening 11b. That is, the first airflow path A passes through the air duct 11aa but does not pass through the electronic control box installation space 11ab, thereby preventing airflow along the first airflow path A from affecting the normal operation of the electronic control box 20.
It should be noted that the electronic control box installation space 11ab is separated from the air duct 11aa, the specific configuration of which is not limited.
For example, referring to FIG. 4, the housing assembly 10 includes a partition member 13 located in the accommodation cavity 11a, and the partition member 13 is arranged between the first air inlet 11c and the heat exchange core installation space to separate and define the electronic control box installation space 11ab and the air duct 11aa. Thus, by providing the partition member 13, on one hand, it can block the airflow in the air duct 11aa from affecting the electronic control box 20, and on the other hand, it can also support the electronic control box 20.
Additionally, the electronic control box 20 is arranged in the electronic control box installation space 11ab. The heat exchange core installation space is used for installing the heat exchange core 60 of the fresh air unit, and its structural form is not limited, such as an installation slot with its open end facing the opening 11b side of the outer housing 11.
The number of the air inlets and outlets on the housing 11 may be configured according to actual conditions.
For example, referring to FIGs. 1 to 3, the housing 11 further includes a second air inlet 11e and a second air outlet 11f communicating with the accommodation cavity 11a. A second airflow path B passing through the heat exchange core 60 is formed between the second air inlet 11e and the second air outlet 11f.
The airflow flowing along the first airflow path A and the airflow flowing along the second airflow path B both enter the heat exchange core 60 when passing through the heat exchange core 60 and exchange heat within the heat exchange core 60.
For example, in the fresh air unit shown in FIG. 3, the first air inlet 11c and the second air outlet 11f communicate with the indoor environment, respectively, while the first air outlet 11d and the second air inlet 11e communicate with the outdoor environment, respectively. The outdoor airflow (also referred to as fresh air) enters the housing assembly 10 from the second air inlet 11e and flows along the second airflow path B within the housing assembly 10, then flows into the indoor space from the second air outlet 11f. The indoor airflow (also referred to as return air) enters the housing assembly 10 from the first air inlet 11c and flows along the first airflow path A within the housing assembly 10, then is discharged to the outdoors from the first air outlet 11d. This means that in the fresh air unit shown in FIG. 3, the second airflow path B is a fresh air path through which fresh air flows, and the first airflow path A is a return air path through which return air flows. The fresh air flowing along the second airflow path B and the return air flowing along the first airflow path A exchange heat when passing through the heat exchange core 60, so as to pre-cool or pre-heat the fresh air, such that the temperature of the fresh air can be close to the room temperature.
In some other embodiments, it is also possible that the first air inlet 11c and the second air outlet 11f communicate with the outdoor environment, respectively, while the first air outlet 11d and the second air inlet 11e communicate with the indoor environment, respectively. This means that outdoor fresh air enters the housing assembly 10 from the first air inlet 11c and flows along the first airflow path A within the housing assembly 10, then flows into the indoor space from the first air outlet 11d. The indoor return air enters the housing assembly 10 from the second air inlet 11e and flows along the second airflow path B within the housing assembly 10, then is discharged to the outdoors from the second air outlet 11f. This means that the first airflow path A is a fresh air path through which the fresh air flows, and the second airflow path B is a return air path through which the return air flows.
The fresh air unit may also be equipped with corresponding components in the accommodation cavity 11a according to actual needs.
For example, referring to FIG. 3, a first fan 61 and a second fan 62 are arranged inside the housing assembly 10. In a conventional fresh air mode, the first fan 61 is configured to drive the airflow along the first airflow path A, and the second fan 62 is configured to drive the airflow along the second airflow path B.
Still taking the fresh air unit shown in FIG. 3 as an example, a pre-filter 63 may be arranged on the second airflow path B formed between the second air inlet 11e and the second air outlet 11f. The pre-filter 63 is configured to filter large particulate matter from the outdoor fresh air. For example, referring to FIG. 3, the pre-filter 63 may be arranged between the second air inlet 11e and the heat exchange core 60, so as to filter out large particulate matter from the outdoor fresh air before the outdoor fresh air enters the heat exchange core 60, preventing large particulate matter from clogging the heat exchange core 60 and affecting the performance of the heat exchange core 60.
Continuing to refer to FIG. 3, a high-efficiency filter 64 may also be arranged on the second airflow path B. The high-efficiency filter 64 is configured to filter fine particulate matter from the outdoor fresh air, such as fine particles down to PM0.3 in size. The high-efficiency filter 64 may be used in conjunction with the pre-filter 63. For example, the high-efficiency filter 64 and the pre-filter 63 may be arranged on the same side of the heat exchange core 60 as shown in FIG. 3. In other embodiments, the high-efficiency filter 64 and the pre-filter 63 may also be arranged on opposite sides of the heat exchange core 60, respectively.
Moreover, generally speaking, the high-efficiency filter 64 should be located downstream of the pre-filter 63 along the fresh air flow direction. That is to say, regardless of whether the high-efficiency filter 64 and the pre-filter 63 are arranged on the same side of the heat exchange core 60 or on opposite sides of the heat exchange core 60, the outdoor fresh air should first pass through the pre-filter 63 and then through the high-efficiency filter 64.
A pre-filter 63 may also be arranged on the first airflow path A formed between the first air inlet 11c and the first air outlet 11d. By way of example, the pre-filter 63 may be arranged between the first air inlet 11c and the heat exchange core 60, so as to filter out large particulate matter from the indoor return air before the indoor return air enters the heat exchange core 60, preventing large particulate matter from clogging the heat exchange core 60 and affecting the performance of the heat exchange core 60.
It can be understood that when the first airflow path A is the fresh air path through which the fresh air flows and the second airflow path B is the return air path through which the return air flows, the arrangement of the pre-filter 63 and the high-efficiency filter 64 is opposite to that described in the above embodiment.
Continuing to refer to FIG. 3, a bypass channel 65 is formed by a gap between the heat exchange core 60 and at least one side wall of the housing 11. A bypass path C passing through the bypass channel 65 is also formed between the second air inlet 11e and the second air outlet 11f.
The bypass channel 65 is mainly used during transitional seasons. The transitional season refers to a period when the indoor and outdoor temperatures are relatively similar. Generally, spring and autumn can be considered transitional seasons.
In the conventional fresh air mode, the bypass channel 65 is in a closed state, meaning that the fresh air and the return air flow through the heat exchange core 60 without passing through the bypass channel 65.
During the transitional season, when the indoor and outdoor temperatures are similar, the heat exchange effect between the fresh air and the return air at the heat exchange core 60 is not significant. Therefore, the bypass channel 65 may be opened to guide a portion of the return air or a portion of the fresh air to flow through the bypass channel 65. In other words, depending on the configuration, either a portion of the return air may flow along the bypass path C or a portion of the fresh air may flow along the bypass path C, thereby achieving energy savings.
Taking the fresh air unit shown in FIG. 3 as an example, during the transitional season, the bypass channel 65 may be opened such that a portion of the fresh air entering the housing assembly 10 through the second air inlet 11e does not flow through the heat exchange core 60 but instead flows through the bypass channel 65 to the second air outlet 11f. The remaining portion of the fresh air continues to flow along the second airflow path B, while the return air still flows along the first airflow path A. This means that the return air and a portion of the fresh air flow through the heat exchange core 60 and undergo heat exchange at the heat exchange core 60.
In some other embodiments, when the second airflow path B is the return air path through which return air flows, and the first airflow path A is the fresh air path through which fresh air flows, after opening the bypass channel 65 during the transitional season, a portion of the return air entering the housing assembly 10 through the second air inlet 11e does not flow through the heat exchange core 60 but instead flows through the bypass channel 65 to the second air outlet 11f. The remaining portion of the return air continues to flow along the second airflow path B, while the fresh air flows along the first airflow path A. This means that the fresh air and a portion of the return air flow through the heat exchange core 60 and undergo heat exchange at the heat exchange core 60.
In some other embodiments, in addition to the bypass channel 65, another channel may be provided. During the transitional season, one of a portion of fresh air and a portion of return air may be guided to flow through the bypass channel 65 as described in the previous embodiments, while the other of a portion of fresh air and a portion of return air flows through the another channel. This means that a portion of the fresh air and a portion of the return air do not flow through the heat exchange core 60, while the remaining portion of the fresh air and the remaining portion of the return air still flow through the heat exchange core 60 and undergo heat exchange at the heat exchange core 60.
Additionally, referring to FIG. 3, a damper assembly 66 may be provided at the bypass channel 65 to open or close the bypass channel 65.
The fresh air unit may also include an electric heating device 67 located on a side of the heat exchange core 60 close to the air inlet along the fresh air path. This ensures that when the temperature is low, the outdoor air flowing into the accommodation cavity 11a is heated by the electric heating device 67, thereby preventing condensation.
A further embodiment of the present disclosure provides an electronic control box 20. The electronic control box 20 is the electronic control box 20 according to any embodiment of the present disclosure.
The accommodation cavity 11a of the housing 11 of the fresh air unit provided in the embodiments of the present disclosure includes the heat exchange core installation space, the air duct 11aa, and the electronic control box installation space 11ab. The air duct 11aa is located between the first air inlet 11c and the heat exchange core installation space. The first airflow path A is formed between the first air inlet 11c and the first air outlet 11d, passing through the air duct 11aa and the heat exchange core installation space. The electronic control box installation space 11ab is located on a side of the air duct 11aa close to the opening 11b. That is to say, the space between the air duct 11aa and the cover plate 12 is utilized to accommodate the electronic control box 20, so that the electronic control box 20 is built into the accommodation cavity 11a of the housing 11, which means the electronic control box 20 is neither externally mounted nor occupies other positions in the accommodation cavity 11a. Thus, the space inside the housing assembly 10 can be fully utilized to reduce the overall size of the fresh air unit, thereby not only reducing the installation space occupied by the fresh air unit but also reducing the packaging size of the fresh air unit, so as to lower the packaging costs of the fresh air unit.
In an embodiment, referring to FIGs. 13 to 15, the partition member 13 includes a first wall 131 and two second walls 132 respectively arranged on opposite sides of the first wall 131. The first wall 131, the two second walls 132, and the housing 11 together enclose and form the air duct 11aa. The electronic control box installation space 11ab is located on a side of the first wall 131 facing away from the air duct 11aa.
Specifically, at least a partial area of the two second walls 132 is located on a side of the first wall 131 close to the housing 11, and together with the first wall 131 and the housing 11, they enclose and form the air duct 11aa. In practice, the electronic control box installation space 11ab is located between the first wall 131 and the cover plate 12. Thus, the space between the first wall 131 and the cover plate 12 may be used to install the electronic control box 20, integrating the electronic control box 20 into the accommodation cavity 11a without increasing the size of the fresh air unit. Moreover, when maintenance of the electronic control box 20 is required, the cover plate 12 can be directly opened for servicing, eliminating the need to dismount the electronic control box 20 and thereby improving the maintenance convenience of the fresh air unit.
To further enhance the sealing and safety of the electronic control box 20, sealing components may be installed at different positions of the electronic control box 20.
For example, referring to FIG. 13, the fresh air unit includes a first sealing member 30. The first sealing member 30 is located between the partition member 13 and the electronic control box 20. This ensures isolation between the electronic control box 20 and the air duct 11aa, preventing air leakage from affecting the performance of the electronic control box 20. Certainly, the electronic control box 20 and the partition member 13 may be connected and secured via fasteners to enhance the stability of the electronic control box 20.
As another example, the fresh air unit further includes a second sealing member, the electronic control box 20 being provided with a first wire passage port 20a, a side wall of the housing 11 being provided with a second wire passage port 11g communicating with the first wire passage port 20a, the second sealing member being sandwiched between a side wall of the electronic control box 20 provided with the first wire passage port 20a and a side wall of the housing 11 provided with the second wire passage port 11g.
Specifically, the first wire passage port 20a of the electronic control box 20 is in communication with the second wire passage port 11g of the housing 11 to allow signal lines (power lines, control lines, etc.) connected to the electronic control box 20 to pass through to the outside of the fresh air unit. Moreover, placing the second sealing member between the electronic control box 20 and the side wall of the housing 11 ensures sealing at the first wire passage port 20a and the second wire passage port 11g.
Both the first sealing member 30 and the second sealing member may be made of sealing sponge.
In an embodiment, referring to FIG. 14, at least one of the two second walls 132 is provided with a side edge close to the first air inlet 11c bent to form a first flange 133 that fits against the side wall of the housing 11 provided with the first air inlet 11c.
Specifically, only one second wall 132 may form a first flange 133 that fits against the side wall of the housing 11 provided with the first air inlet 11c, or both second walls 132 may be provided with first flanges 133. The first flange 133 may be formed by bending the second wall 132 toward the side close to the air duct 11aa or by bending the second wall 132 toward the side away from the air duct 11aa.
It should be noted that fastening holes may also be provided at corresponding positions on the first flange 133 and the side wall of the housing 11 to enhance the stability of the partition member 13.
In an embodiment, referring to FIG. 14, the side edge of the first wall 131 close to the first air inlet 11c is bent to form a second flange 134 that fits against the side wall of the housing 11 provided with the first air inlet 11c.
Specifically, the second flange 134 may be formed by bending the first wall 131 toward the side close to the air duct 11aa or by bending the first wall 131 toward the side away from the air duct 11aa. Additionally, fastening holes may also be provided at corresponding positions on the second flange 134 and the side wall of the housing 11 to enhance the stability of the partition member 13.
In an embodiment, referring to FIG. 14, one of the two second walls 132 is bent toward an exterior of the partition member 13 to form a fan connection edge 135.
Specifically, the wall of the two second walls 132 close to the fan (such as the first fan 61 on the first airflow path A or the second fan 62 on the second airflow path B) is bent to a side away from the air duct 11aa to form the fan connection edge 135. The fan connection edge 135 may be configured to secure the fan and may also be configured to be fixed to the housing 11.
In an embodiment, referring to FIG. 14, the two second walls 132 are respectively provided with a first flange 133 bent toward each other, and side edges of the two first flanges 133 close to each other are bent inward into the partition member 13, so that a filter installation slot 133a is formed between the two first flanges 133.
Specifically, both of the two second walls 132 are bent to form first flanges 133, and the first flanges 133 extend toward the air duct 11aa. Thus, the gap between the two first flanges 133 may be used to install the filter of the fresh air unit. In practice, the filter is also located at the first air inlet 11c to filter the airflow entering from the first air inlet 11c. For example, the first airflow path A is a return air path, and the filter is a coarse filter.
Certainly, a filter installation port 131a in communication with the filter installation slot 133a may also be provided on the first wall 131. This allows the filter to be installed from the opening 11b side of the accommodation cavity 11a, improving the convenience of filter installation.
For example, the spacing between the two first flanges 133 gradually decreases from the side close to the filter installation port 131a toward the side away from the filter installation port 131a. It should be noted that, since the spacing between the two first flanges 133 gradually decreases, after the filter is inserted into the filter installation slot 133a from the filter installation port 131a, the two first flanges 133 can clamp the filter, thereby securing the filter and preventing the filter from loosening.
Herein, the specific clamping configuration of the first flanges 133 is not limited. For example, the spacing between the ends of the two first flanges 133 close to the filter installation port 131a is equal to the length of the filter installation port 131a, and the slot length of the filter installation slot 133a is greater than or equal to the length of the filter inside the filter installation slot 133a.
As another example, referring to FIG. 14, the two first flanges 133 are bent along the flow direction of the first airflow path A to form clamping edges 1331. By providing two clamping edges 1331, the filter can be more securely clamped.
As yet another example, the two first flanges 133 are trapezoidal in structure, or only one first flange 133 may be configured as a trapezoidal structure.
In an embodiment, referring to FIG. 5, the fresh air unit further includes a filter partition plate 41. The filter partition plate 41 is located on the side of the electronic control box 20 close to the first air inlet 11c, and the filter partition plate 41 is spaced apart from at least a partial area of the electronic control box 20, forming a filter installation space 41a in communication with the filter installation slot 133a at the spacing. Herein, the filter partition plate 41 and the electronic control box 20 may be completely spaced apart or only partial areas thereof are spaced apart. The filter may be inserted from the filter installation space 41a into the filter installation port 131a, and then into the filter installation slot 133a.
The filter is inserted into the filter installation slot 133a through the filter installation space 41a, with a partial area of the filter located in the filter installation space 41a. That is, by increasing the length of the filter, the filter can be directly pulled out from the opening 11b side of the accommodation cavity 11a during maintenance or for replacement, improving the convenience of filter maintenance.
In an embodiment, referring to FIGs. 5 and 6, the electronic control box 20 includes a box body 21 and a first control assembly 22 and a second control assembly 23 installed inside the box body 21. The first control assembly 22 includes a first control board 221 with a first component mounting surface 221a, and the second control assembly 23 includes a second control board 231 with a second component mounting surface 231a.
Specifically, the electronic control box 20 includes two control boards, where the first control board 221 serves as a primary control board (i.e., a main control board), the first control board 221 carrying most of the electronic components and wiring connectors. The second control board 231 serves as a secondary control board (i.e., an auxiliary control board). As the secondary control board, the second control board 231 carries fewer electronic components and wiring connectors. The second control board 231 can be considered an extension of the first control board 221 to enable additional functional controls. The second control board 231 and the first control board 221 communicate via a communication cable.
Certainly, it is also possible for the first control board 221 to be the secondary control board and the second control board 231 to be the primary control board.
Herein, the first component mounting surface 221a is the mounting surface on the first control board 221 used for installing components, and the second component mounting surface 231a is the mounting surface on the second control board 231 used for installing components.
On a projection plane parallel to the first component mounting surface 221a, a projection of the first component mounting surface 221a and a projection of the second component mounting surface 231a at least partially overlap.
That is, the first control board 221 and the second control board 231 are spaced apart and stacked. This allows the size of the electronic control box 20 to be minimized as much as possible.
For example, one side of the box body 21 of the electronic control box 20 is open to form an open end 21a, and the second control board 231 is mounted on the side of the first control board 221 close to the open end 21a.
It should be noted that when the second control board 231 is the secondary control board and the first control board 221 is the primary control board, the size of the second control board 231 is smaller than that of the first control board 221. Additionally, mounting the second control board 231 on the side of the first control board 221 close to the open end 21a facilitates maintenance of both the first control board 221 and the second control board 231 from the open end 21a side.
Furthermore, the first control assembly 22 may also include a mounting structure 222 for installing the first control board 221.
In an embodiment, referring to FIG. 5, the electronic control box 20 includes a wiring bracket 24 and a fixing bracket 25. The wiring bracket 24 and fixing bracket 25 are arranged inside the box body 21, with one side of the box body 21 open to form an open end 21a. The second control assembly 23 is located on the side of the first control board 221 close to the open end 21a and is connected to both the fixing bracket 25 and the wiring bracket 24. This allows the second control board 231 to be mounted on the side of the first control board 221 close to the open end 21a, thereby reducing the size of the electronic control box 20.
Specifically, the second control assembly 23 is fixed inside the box body 21 by connecting to the wiring bracket 24 and the fixing bracket 25. During the production process, the second control assembly 23 may be pre-assembled. Once other structures such as the first control assembly 22, fixing bracket 25, and wiring bracket 24 are installed on the final assembly line, the second control assembly 23 is then installed into the electronic control box 20.
The specific structure of the second control assembly 23 is not limited.
For example, referring to FIGs. 6 and 7, the second control assembly 23 includes an installation box 232 and a support plate 233. The second control board 231 is arranged inside the installation box 232, and the support plate 233 is located on the side of the installation box 232 facing away from the second control board 231, connected to both the fixing bracket 25 and the wiring bracket 24. This ensures that the second control board 231 is securely installed inside the installation box 232 and firmly connected to the fixing bracket 25 and wiring bracket 24 via the support plate 233.
The connection between the support plate 233 and the fixing bracket 25 and wiring bracket 24 may be achieved through fastening, snap-fit, riveting, or other connection methods.
Herein, the material of the installation box 232 is not limited; for example, the installation box 232 is a plastic component.
For example, referring to FIGs. 8 and 11, a partial area of one of the support plate 233 and the fixing bracket 25 protrudes to form a first snap-fit protrusion 2331, and a partial area of the other is recessed to form a first snap-fit recess 25a, the first snap-fit protrusion 2331 extends into the first snap-fit recess 25a to form a snap-fit connection between the support plate 233 and the fixing bracket 25.
Specifically, the support plate 233 may form the first snap-fit protrusion 2331, and the fixing bracket 25 may form the first snap-fit recess 25a. By engaging the first snap-fit protrusion 2331 into the first snap-fit recess 25a, the support plate 233 and the fixing bracket 25 are securely connected. Alternatively, the support plate 233 may be formed with a first snap-fit recess, and the fixing bracket 25 may form a first snap-fit protrusion. Thus, the support plate 233 may be positioned on the fixing bracket 25 to facilitate their connection.
For another example, referring to FIGs. 8 and 9, a partial area of one of the support plate 233 and the wiring bracket 24 protrudes to form a second snap-fit protrusion 2332, and a partial area of the other is recessed to form a second snap-fit recess 24a, the second snap-fit protrusion 2332 extends into the second snap-fit recess 24a to form a snap-fit connection between the support plate 233 and the wiring bracket 24.
Specifically, the support plate 233 may form the second snap-fit protrusion 2332, and the wiring bracket 24 may form the second snap-fit recess 24a. By engaging the second snap-fit protrusion 2332 into the second snap-fit recess 24a, the support plate 233 and the wiring bracket 24 are securely connected. Alternatively, the support plate 233 may be formed with a second snap-fit recess, and the wiring bracket 24 may form a second snap-fit protrusion. Thus, the support plate 233 may be positioned on the wiring bracket 24 to facilitate their connection.
The support plate 233 is snap-connected to both the fixing bracket 25 and the wiring bracket 24, which minimizes the use of fasteners, such as using only one fastener to secure the second control assembly 23.
In an embodiment, referring to FIG. 11, the fixing bracket 25 is provided with a first fastening hole 25b, a partial area of the fixing bracket 25 is bent to a side away from the open end 21a to form a third flange 251, and on a projection plane parallel to the third flange 251, a projection of the first fastening hole 25b is located within a projection range of the third flange 251.
Specifically, the first fastening hole 25b may be a fastening hole for connecting the fixing bracket 25 to the support plate 233 or for connecting to other structures. After bending, the third flange 251 extends to the side of the first fastening hole 25b away from the open end 21a. Thus, the third flange 251 can shield the first fastening hole 25b, preventing fasteners passing through the first fastening hole 25b from scraping against the first control board 221 located on the side of the second control assembly 23 away from the open end 21a. This avoids restricting the wiring of the first control board 221 and improves structural safety.
Alternatively, when the support plate 233 forms the first snap-fit protrusion 2331, the fixing bracket 25 forms the first snap-fit recess 25a, and the first snap-fit recess 25a is located close to the first fastening hole 25b, the third flange 251 may also shield the first snap-fit protrusion 2331 extending into the first snap-fit recess 25a.
It should be noted that the position of the fixing bracket 25 is not limited. For example, the fixing bracket 25 may be arranged on a side wall of the box body 21. The fixing bracket 25 and the box body 21 may be fixed by forming a snap-fit protrusion and a snap-fit recess, respectively, achieving fixation through snap-fit connection.
In an embodiment, referring to FIG. 8, the support plate 233 is provided with a second fastening hole 233a, the installation box 232 is provided with a third fastening hole, at least partial areas of two adjacent side edges of the support plate 233 are bent toward a side of the support plate 233 to form positioning bent edges 2333, respectively, and the two positioning bent edges 2333 fit against two adjacent side walls of the installation box 232 in a one-to-one correspondence, such that the second fastening hole 233a is aligned with the third fastening hole.
Specifically, by having the two positioning bent edges 2333 fit against the two side walls of the installation box 232 correspondingly, the second fastening hole 233a and the third fastening hole can be quickly aligned without manual adjustment. Thus, the assembly of the support plate 233 and the installation box 232 is facilitated, improving assembly efficiency.
In an embodiment, referring to FIG. 8, a partial area of the support plate 233 is bent toward a side with the positioning bent edges 2333 to form a fourth flange 2334 with the second fastening hole 233a.
Specifically, the installation box 232 is connected at the fourth flange 2334 of the support plate 233. Due to the formation of the fourth flange 2334, the area of the support plate 233 on a side of the fourth flange 2334 away from the open end 21a can shield the second fastening hole 233a. This prevents fasteners passing through the second fastening hole 233a and the third fastening hole from interfering with the first control board 221.
The wiring bracket 24 is a component within the electronic control box 20 used for wire clamping and wiring, which may include a bracket body, and a wire clamp and a wiring base arranged on the bracket body.
It should be noted that the specific shape of the wiring bracket 24 is not limited.
For example, referring to FIG. 9, the wiring bracket 24 includes a wiring plate 241 and support feet 242. The support feet 242 are arranged on opposite sides of the wiring plate 241 and the support feet 242 are fixed to a bottom wall of the housing 11.
Specifically, the specific shape of the support feet 242 is not limited. For example, they may be bent to form an L-shaped structure, with bottom edges of the support feet 242 fitting against the bottom wall of the housing 11.
Fastening holes may be formed in corresponding positions of the support feet 242 and the bottom wall of the housing 11, allowing the two to be securely connected by fasteners.
In an embodiment, referring to FIG. 9, the wiring bracket 24 is provided with a fourth fastening hole 24b, a partial area of the wiring bracket 24 is bent to a side away from the open end 21a to form a fifth flange 243, and on a projection plane parallel to the fifth flange 243, a projection of the fourth fastening hole 24b is located within a projection range of the fifth flange 243.
Specifically, the fourth fastening hole 24b may be a fastening hole for connecting the wiring bracket 24 to the second control assembly 23, or may be a fastening hole for connecting to other structures. After bending, the fifth flange 243 extends to the side of the fourth fastening hole 24b away from the open end 21a. Thus, the fifth flange 243 can shield the fourth fastening hole 24b, preventing fasteners passing through the fourth fastening hole 24b from scraping against the first control board 221 located on the side of the second control assembly 23 away from the open end 21a. This avoids restricting the wiring of the first control board 221 and improves structural safety.
Herein, when a second snap-fit recess 24a cooperating with the support plate 233 is formed on the wiring bracket 24, the fifth flange 243 may also extend to a side of the second snap-fit recess 24a away from the open end 21a. Thus, the fifth flange 243 may also shield the second snap-fit protrusion 2332 engaged into the second snap-fit recess 24a.
It should be noted that the installation position of the wiring bracket 24 is not limited. It may be such that, on a projection plane parallel to the first component mounting surface 221a, a projection of the wiring bracket 24 at least partially overlaps with a projection of the first component mounting surface 221a. In other words, a partial area of the wiring bracket 24 may be located on a side of the first component mounting surface 221a close to the open end 21a of the box body 21 to reduce the structural size of the electronic control box 20.
Certainly, referring to FIG. 5, on a projection plane parallel to the first component mounting surface 221a, the projection of the wiring bracket 24 may also be located outside the projection range of the first component mounting surface 221a. This avoids the wiring bracket 24 obstructing the first component mounting surface 221a, making it easier for maintenance personnel to carry out maintenance on the first control board 221.
In an embodiment, referring to FIGs. 2, 6, and 10, the fresh air unit includes a partition plate 50 arranged within the accommodation cavity 11a. The partition plate 50 at least covers the open end 21a. The box body 21 is provided with a sixth flange 211 located around the periphery of the open end 21a. The electronic control box 20 further includes a third sealing member 26 arranged between the sixth flange 211 and the partition plate 50.
Specifically, the partition plate 50 is arranged between the electronic control box 20 and the cover plate 12, serving as a substitute for the box cover of the electronic control box 20. This eliminates the need for a separate box cover for the electronic control box 20, thereby reducing the overall size of the fresh air unit to some extent.
The partition plate 50 at least covers the open end 21a, meaning the partition plate 50 may only cover the open end 21a. Of course, it may also cover other structures within the accommodation cavity 11a, such as sensors arranged in the accommodation cavity 11a. Thus, when maintenance is required for the fresh air unit, only the cover plate 12 and the partition plate 50 need to be opened to perform maintenance operations on the structures within the accommodation cavity 11a. During daily use, the partition plate 50 can also protect structures such as the electronic control box 20.
The sixth flange 211 is formed around the periphery of the open end 21a of the box body 21, which can increase the contact area with the partition plate 50. The third sealing member 26 is provided between the sixth flange 211 and the partition plate 50, thereby further improving the sealing performance of the electronic control box 20 and preventing external airflow from affecting the interior of the electronic control box 20. Herein, the third sealing member 26 may be made of sealing sponge.
In an embodiment, referring to FIG. 10, the box body 21 is provided with a seventh flange 212 located around the periphery of the open end 21a and bent toward the exterior of the box body 21. One of the partition plate 50 and the seventh flange 212 is provided with a third snap-fit protrusion, while the other is provided with a third snap-fit recess 212a. The third snap-fit protrusion extends into the third snap-fit recess 212a to snap-connect the partition plate 50 and the box body 21.
Specifically, the third snap-fit protrusion may be formed on the partition plate 50, with a partial area of the seventh flange 212 recessed to form the third snap-fit recess 212a, or the third snap-fit protrusion may be formed on the seventh flange 212, with a partial area of the partition plate 50 recessed to form the third snap-fit recess. Thus, by engaging the third snap-fit protrusion into the third snap-fit recess 212a, the connection stability between the partition plate 50 and the electronic control box 20 can be improved.
In an embodiment, referring to FIG. 10, the box body 21 includes a first side wall 213 and a second side wall 214 arranged adjacent to each other. A side of the first side wall 213 close to the second side wall 214 wraps around an outer surface of the second side wall 214.
That is, a vertical side edge, connecting the second side wall 214, of the first side wall 213 wraps around one side of the second side wall 214, forming a hemmed edge. This improves the tightness at the connection between the first side wall 213 and the second side wall 214 and facilitates welding of the first side wall 213 and the second side wall 214, thereby enhancing the sealing effect and structural stability of the electronic control box 20.
Additionally, referring to FIG. 12, the box body 21 may further include a second side wall 214 and a third side wall 215 arranged adjacent to each other. A side edge of the second side wall 214 close to the third side wall 215 is bent to form an eighth flange 2141, the eighth flange 2141 fitting against the third side wall 215.
Specifically, the side edge of the second side wall 214 close to the third side wall 215 may be bent toward the interior of the box body 21 to form the eighth flange 2141, or it may be bent toward the exterior of the box body 21 to form the eighth flange 2141. By having the eighth flange 2141 fit against the third side wall 215, the tightness at the connection between the third side wall 215 and the second side wall 214 is improved, facilitating welding of the second side wall 214 and the third side wall 215, thereby enhancing the sealing effect and structural stability of the electronic control box 20.
It should be noted that corresponding fastening holes may be provided respectively at the connection between the eighth flange 2141 and the second side wall 214 to facilitate secure connection between the two.
In the description of the present disclosure, references to terms such as "in one embodiment," "in some embodiments," "in a specific embodiment," or "exemplary" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present disclosure. In the present disclosure, the illustrative references to the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in any suitable manner. Furthermore, without contradicting each other, those skilled in the art may combine the different embodiments or examples described in the present disclosure and the features of the different embodiments or examples.
The above is only the description of preferable embodiments of the present disclosure, and is not intended to limit the present disclosure. It will be apparent to those of ordinary skill in the art that various modifications and variations can be made to the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

A fresh air unit, comprising:
a housing assembly, comprising a housing and a cover plate, wherein the housing is provided with an accommodation cavity, an opening communicating with the accommodation cavity, a first air inlet, and a first air outlet, and the accommodation cavity comprises a heat exchange core installation space, an air duct, and an electronic control box installation space, wherein:
the air duct is located between the first air inlet and the heat exchange core installation space;

a first airflow path passing through the air duct and the heat exchange core installation space is formed between the first air inlet and the first air outlet;

the electronic control box installation space is located on a side of the air duct close to the opening; and

the cover plate is mounted at the opening; and

an electronic control box, arranged in the electronic control box installation space.
The fresh air unit of claim 1, wherein the housing assembly comprises a partition member located in the accommodation cavity, the partition member being arranged between the first air inlet and the heat exchange core installation space to separate and define the electronic control box installation space and the air duct.
The fresh air unit of claim 2, wherein the partition member comprises a first wall and two second walls respectively arranged on opposite sides of the first wall, wherein the first wall, the two second walls, and the housing together enclose to form the air duct, and the electronic control box installation space is located on a side of the first wall facing away from the air duct.
The fresh air unit of claim 2, further comprising:
a first sealing member located between the partition member and the electronic control box; and/or

a second sealing member, wherein:
the electronic control box is provided with a first wire passage port;

a side wall of the housing is provided with a second wire passage port communicating with the first wire passage port; and

the second sealing member is sandwiched between a side wall of the electronic control box provided with the first wire passage port and a side wall of the housing provided with the second wire passage port.
The fresh air unit of claim 3, wherein:
a side edge of at least one of the two second walls close to the first air inlet is bent to form a first flange that fits against a side wall of the housing provided with the first air inlet; and/or

a side edge of the first wall close to the first air inlet is bent to form a second flange that fits against the side wall of the housing provided with the first air inlet; and/or

one of the two second walls is bent toward an exterior of the partition member to form a fan connection edge.
The fresh air unit of claim 5, wherein the two second walls are provided with respective first flanges formed by bending the two second walls toward each other, wherein side edges of the two first flanges extending towards each other are bent toward an interior of the partition member, such that a filter installation slot is formed between the two first flanges.
The fresh air unit of claim 6, wherein:
the first wall is provided with a filter installation port communicating with the filter installation slot; and/or

the first wall is provided with a filter installation port communicating with the filter installation slot, and a spacing between the two first flanges gradually decreases from a side close to the filter installation port toward a side away from the filter installation port.
The fresh air unit of claim 6, further comprising a filter and a filter partition plate, wherein:
the filter partition plate is arranged on a side of the electronic control box close to the first air inlet; and

the filter partition plate is mounted with a clearance from at least a partial area of the electronic control box, such that a filter installation space communicating with the filter installation slot is formed at the clearance, and the filter is inserted into the filter installation slot through the filter installation space, with a partial area of the filter located in the filter installation space.
The fresh air unit of any one of claims 1-8, wherein the electronic control box comprises a box body, and a first control assembly and a second control assembly arranged inside the box body, wherein the first control assembly comprises a first control board provided with a first component mounting surface, and the second control assembly comprises a second control board provided with a second component mounting surface, wherein on a projection plane parallel to the first component mounting surface, a projection of the first component mounting surface and a projection of the second component mounting surface at least partially overlap.
The fresh air unit of claim 9, wherein:
the electronic control box comprises a wiring bracket and a fixing bracket arranged inside the box body;

a side of the box body is open to form an open end; and

the second control assembly is located on a side of the first control board close to the open end and is connected to the fixing bracket and the wiring bracket, respectively.
The fresh air unit of claim 10, wherein:
the second control assembly comprises an installation box and a support plate;

the second control board is arranged inside the installation box; and

the support plate is located on a side of the installation box away from the second control board and is connected to the fixing bracket and the wiring bracket, respectively.
The fresh air unit of claim 11, wherein:
a partial area of one of the support plate and the fixing bracket protrudes to form a first snap-fit protrusion, and a partial area of the other is recessed to form a first snap-fit recess, wherein the first snap-fit protrusion extends into the first snap-fit recess to form a snap-fit connection between the support plate and the fixing bracket; and/or

a partial area of one of the support plate and the wiring bracket protrudes to form a second snap-fit protrusion, and a partial area of the other is recessed to form a second snap-fit recess, wherein the second snap-fit protrusion extends into the second snap-fit recess to form a snap-fit connection between the support plate and the wiring bracket.
The fresh air unit of claim 11, wherein:
the fixing bracket is provided with a first fastening hole; a partial area of the fixing bracket is bent to a side away from the open end to form a third flange; and on a projection plane parallel to the third flange, a projection of the first fastening hole is located within a projection range of the third flange; and/or

the fixing bracket is arranged on a side wall of the box body; and/or

the support plate is provided with a second fastening hole; the installation box is provided with a third fastening hole; at least partial areas of two adjacent side edges of the support plate are bent toward a side of the support plate to form positioning bent edges, respectively, and the two positioning bent edges fit against two adjacent side walls of the installation box in a one-to-one correspondence, such that the second fastening hole is aligned with the third fastening hole.
The fresh air unit of claim 13, wherein a partial area of the support plate is bent toward a side provided with the positioning bent edges to form a fourth flange provided with the second fastening hole.
The fresh air unit of claim 10, wherein:
on a projection plane parallel to the first component mounting surface, a projection of the wiring bracket is located outside a projection range of the first component mounting surface; and/or

the wiring bracket comprises a wiring plate and support feet arranged on opposite sides of the wiring plate, and the support feet are fixed on a bottom wall of the housing; and/or

the wiring bracket is provided with a fourth fastening hole; a partial area of the wiring bracket is bent to a side away from the open end to form a fifth flange; and on a projection plane parallel to the fifth flange, a projection of the fourth fastening hole is located within a projection range of the fifth flange.
The fresh air unit of claim 10, further comprising a partition plate arranged inside the accommodation cavity, wherein:
the partition plate at least shields the open end; the box body is provided with a sixth flange located around a periphery of the open end; and the electronic control box further comprises a third sealing member arranged between the sixth flange and the partition plate; and/or

the box body is provided with a seventh flange located around the periphery of the open end and formed by bending toward an exterior of the box body, wherein one of the partition plate and the seventh flange is provided with a third snap-fit protrusion, and the other is provided with a third snap-fit recess, the third snap-fit protrusion extending into the third snap-fit recess to form a snap-fit connection between the partition plate and the box body.
The fresh air unit of claim 10, wherein:
the box body comprises a first side wall and a second side wall arranged adjacent to each other, wherein a side of the first side wall close to the second side wall covers an outer surface of the second side wall; and/or

the box body comprises a second side wall and a third side wall arranged adjacent to each other, wherein a side of the second side wall close to the third side wall is bent to form an eighth flange, the eighth flange fitting against the third side wall.
An electronic control box, wherein the electronic control box is the electronic control box of any one of claims 1-17.