A heat exchange fresh air fan

Abstract

An embodiment of the present application provides a heat exchange fresh air blower, comprising a heat exchange core, a shell assembly, and an electrical control box; the shell assembly comprises an outer shell and an inspection cover, the bottom wall of the outer shell is provided with an inspection port, the side wall on one side of the outer shell is provided with a return air inlet and a fresh air outlet, the side wall on the other side opposite to the outer shell is provided with a fresh air inlet and a return air outlet, the heat exchange core is detachably disposed in the outer shell and is located at the inspection port, a return air passage passing through the heat exchange core is formed between the return air inlet and the return air outlet, a fresh air passage passing through the heat exchange core is formed between the fresh air inlet and the fresh air outlet, the inspection cover is disposed at the inspection port to selectively open or close the inspection port; the electrical control box is detachably disposed in the outer shell and is adjacent to the inspection port. The heat exchange fresh air blower of the embodiment of the present application can not only effectively protect the electrical control box, but also facilitate the inspection of the electrical control box.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to a heat exchange fresh air fan. Background Art

[0002] The heat exchange fresh air fan is an effective air purification equipment that can circulate indoor air. On the one hand, it discharges the polluted air indoors to the outside, and on the other hand, it inputs the fresh air outdoors into the room after sterilization, disinfection, filtration and other measures.

[0003] In the related art, the electrical control box of the heat exchange fresh air fan is generally set outside the heat exchange fresh air fan. The external electrical control box is convenient for maintenance. However, the external electrical control box is not only prone to aging, but also the condensation water in the external environment can easily enter the electrical control box and cause damage to the electrical control box. Summary of the Invention

[0004] In view of this, the embodiments of the present application hope to provide a heat exchange fresh air fan that can not only effectively protect the electric control box but also facilitate the maintenance of the electric control box.

[0005] To achieve the above objectives, an embodiment of the present application provides a heat exchange fresh air blower, comprising:

[0006] heat exchange core;

[0007] A shell assembly, the shell assembly comprising a shell and an inspection cover, the shell having an inspection opening on the bottom wall, a return air inlet and a fresh air outlet on the side wall of one side of the shell, and a fresh air inlet and a return air outlet on the side wall opposite to the shell, the heat exchange core being detachably disposed within the shell and located at the inspection opening, a return air passage passing through the heat exchange core being formed between the return air inlet and the return air outlet, a fresh air passage passing through the heat exchange core being formed between the fresh air inlet and the fresh air outlet, and the inspection cover being disposed at the inspection opening to selectively open or close the inspection opening;

[0008] An electric control box is detachably disposed in the housing and adjacent to the inspection port.

[0009] In one embodiment, the electric control box is arranged in the return air duct; or,

[0010] The electric control box is arranged in the fresh air channel and located between the fresh air outlet and the heat exchange core.

[0011] In one embodiment, the housing assembly further includes a support assembly disposed within the outer shell, and the electric control box is fastened to the support assembly.

[0012] In one embodiment, the electric control box includes a box body having a first plug-in portion and an electric control element arranged on the box body, the support assembly includes a first support member and a second support member, the first support member has a second plug-in portion, the first plug-in portion is plugged into and matched with the second plug-in portion, and the box body is firmly connected to the second support member.

[0013] In one embodiment, the support assembly is arranged on the side wall of the shell, the box body has a first flange, the first flange and the first plug-in portion are respectively located on opposite sides of the box body in the transverse direction, and the second support member is a support plate having a second flange;

[0014] When the first plug-in portion is plugged into and matched with the second plug-in portion, the first flange abuts against the second flange and is firmly connected to the second flange.

[0015] In one embodiment, the heat exchange fresh air fan further includes a sensor assembly detachably disposed adjacent to the inspection port, wherein the sensor assembly is disposed in the return air channel and located between the return air inlet and the heat exchange core.

[0016] In one embodiment, the sensor assembly has a clip and a connecting portion, and the heat exchange fresh air fan also includes a guide plate and a positioning mounting plate arranged on the side wall of the shell, the guide plate has a guide edge formed by folding, and the positioning mounting plate has a positioning notch, the clip can be slidably clipped to the guide edge, and the connecting portion is clipped into engagement with the positioning notch and is firmly connected to the positioning mounting plate.

[0017] In one embodiment, the heat exchange fresh air fan further includes a primary filter detachably arranged at the inspection port;

[0018] The primary filter is provided on the side of the heat exchange core facing the return air inlet; and / or,

[0019] The primary filter is provided on a side of the heat exchange core facing the fresh air inlet.

[0020] In one embodiment, the heat exchange fresh air fan further includes a high-efficiency filter, which is detachably disposed in the fresh air passage and located at the inspection port.

[0021] In one embodiment, the return air channel is located in an upstream area of ​​the heat exchange core along the airflow direction and is connected to the fresh air channel located in an upstream area of ​​the heat exchange core along the airflow direction, so that an internal circulation channel passing through the heat exchange core is formed between the return air inlet and the fresh air outlet;

[0022] The heat exchange fresh air fan also includes a first air valve assembly and a second air valve assembly. The first air valve assembly can selectively open or close the internal circulation channel, and the second air valve assembly can selectively open or close the fresh air inlet.

[0023] In one embodiment, when the heat exchange fresh air fan is in full heat exchange mode, the first air valve assembly closes the internal circulation channel, and the second air valve assembly opens the fresh air inlet;

[0024] When the heat exchange fresh air fan is in the internal circulation exhaust mode, the first air valve assembly opens the internal circulation channel, and the second air valve assembly closes the fresh air inlet;

[0025] When the heat exchange fresh air fan is in the mixed air mode, the first air valve assembly connects the internal circulation channel, and the second air valve assembly opens the fresh air inlet.

[0026] In one embodiment, the first damper assembly and the second damper assembly are respectively detachably arranged at positions adjacent to the inspection port.

[0027] In one embodiment, the heat exchange fresh air fan includes a fan assembly, and the fan assembly is respectively provided at the fresh air outlet and the return air outlet;

[0028] The fan assembly includes a volute, a fan blade, a drive motor, a first bracket, a shock-absorbing pad and a second bracket. The shock-absorbing pad is clamped between the first bracket and the second bracket, and the shock-absorbing pad, the first bracket and the second bracket are connected to each other. The volute is connected to the second bracket, the fan blade is arranged in the volute, and the drive motor is arranged on the first bracket and is driven and connected to the fan blade.

[0029] In one embodiment, the volute is an injection-molded part, and the first bracket and the second bracket are sheet metal parts.

[0030] In one embodiment, the projection of the outer shape of the heat exchange core in a height direction perpendicular to the shell is a quadrilateral.

[0031] An embodiment of the present application provides a heat exchange fresh air fan, wherein the electric control box of the heat exchange fresh air fan is arranged in the shell. Thus, not only can the aging speed of the electric control box be slowed down, but condensation water can also be prevented as much as possible from entering the electric control box and damaging the electric control box. At the same time, since the electric control box is detachably arranged in the shell and adjacent to the inspection port, when the electric control box needs to be inspected, it is only necessary to open the inspection cover, take out the heat exchange core, and then take out the electric control box from the inspection port. Thus, it is also convenient to inspect the electric control box. That is to say, the heat exchange fresh air fan of the embodiment of the present application can both effectively protect the electric control box and facilitate the inspection of the electric control box. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural diagram of a heat exchange fresh air fan according to an embodiment of the present application;

[0033] Figure 2 for Figure 1 Bottom view of

[0034] Figure 3 for Figure 1 The exploded view of the heat exchange fresh air blower is shown;

[0035] Figure 4 for Figure 1 The internal structure diagram of the heat exchange fresh air fan shown in the figure, the continuous arrows with dotted lines in the figure indicate the flow direction of the airflow when the heat exchange fresh air fan is in full heat exchange mode;

[0036] Figure 5 for Figure 1 The internal structure diagram of the heat exchange fresh air fan shown in the figure, the continuous arrows with dotted lines in the figure indicate the flow direction of the airflow when the heat exchange fresh air fan is in the internal circulation exhaust mode;

[0037] Figure 6 for Figure 1 The internal structure diagram of the heat exchange fresh air fan shown in the figure, the continuous arrows with dotted lines in the figure indicate the flow direction of the air flow when the heat exchange fresh air fan is in mixed air mode;

[0038] Figure 7 for Figure 4 A schematic diagram of the structure of the sensor assembly shown in;

[0039] Figure 8 for Figure 7 The installation diagram of the sensor assembly shown;

[0040] Figure 9 for Figure 4 The structural diagram of the electric control box shown in ;

[0041] Figure 10 for Figure 1 A schematic diagram of part of the internal structure of the heat exchange fresh air fan shown;

[0042] Figure 11 for Figure 10 A magnified view of point A;

[0043] Figure 12 for Figure 9 The installation diagram of the electric control box shown in FIG.

[0044] Figure 13 for Figure 4 The structural diagram of the fan assembly shown in FIG;

[0045] Figure 14 for Figure 13 Exploded view of the fan assembly shown in .

[0046] Description of Reference Numerals

[0047] Housing assembly 10; outer shell 101; bottom wall 101a; inspection port 101b; side wall 101c; return air inlet 101d; return air outlet 101e; fresh air inlet 101f; fresh air outlet 101g; inspection cover 102; heat exchange core 11; mounting bracket 12; guide rail 12a; sensor assembly 13; buckle 131; connecting portion 132; guide plate 14; guide edge 14a; positioning mounting plate 15; positioning notch 15a; electrical control box 16 ;Box body 161;First plug-in portion 161a;First flange 161b;Support assembly 17;First support member 171;Second plug-in portion 171a;Second support member 172;Second flange 172a;Fan assembly 18;Voltage 181;Fan blade 182;Drive motor 183;First bracket 184;Shock-absorbing pad 185;Second bracket 186;First air valve assembly 19;Second air valve assembly 20;Primary filter 21;High efficiency filter 22. DETAILED DESCRIPTION

[0048] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0049] The orientation terms in the description of this application are only used to facilitate the description of this application and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application.

[0050] In the description of this application, the "top" and "bottom" directions or positional relationships are based on the attached Figure 3 The "lateral" orientation or position relationship is based on the Figure 9 The orientation or position relationship shown, where "altitude" is Figure 3 It should be understood that these directional terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0051] The present application embodiment provides a heat exchange fresh air blower, see Figures 1 to 4The heat exchange fresh air fan includes a heat exchange core 11, a shell assembly 10 and an electric control box 16; the shell assembly 10 includes a shell 101 and an inspection cover 102, the bottom wall 101a of the shell 101 has an inspection port 101b, the side wall 101c on one side of the shell 101 has a return air inlet 101d and a fresh air outlet 101g, the side wall 101c on the other side of the shell 101 has a fresh air inlet 101f and a return air outlet 101e, the heat exchange core 11 is detachably arranged in the shell 101 and is located at the inspection port 101b, That is, the heat exchange core 11 can be taken out from the inspection port 101b, a return air channel passing through the heat exchange core 11 is formed between the return air inlet 101d and the return air outlet 101e, and a fresh air channel passing through the heat exchange core 11 is formed between the fresh air inlet 101f and the fresh air outlet 101g, and the inspection cover 102 is set at the inspection port 101b to selectively open or close the inspection port 101b; the electrical control box 16 is detachably set in the outer shell 101 and adjacent to the inspection port 101b, that is, the electrical control box 16 can be taken out from the inspection port 101b.

[0052] Specifically, the electric control box 16 of the embodiment of the present application is arranged in the outer shell 101, thereby not only slowing down the aging speed of the electric control box 16, but also avoiding condensation water from entering the electric control box 16 and damaging the electric control box 16 as much as possible. At the same time, since the electric control box 16 is detachably arranged in the outer shell 101 and adjacent to the inspection port 101b, when the electric control box 16 needs to be inspected, it is only necessary to open the inspection cover 102, take out the heat exchange core 11, and then take out the electric control box 16 from the inspection port 101b. This also makes it easy to inspect the electric control box 16. That is to say, the heat exchange fresh air fan of the embodiment of the present application can not only effectively protect the electric control box 16, but also facilitate the inspection of the electric control box 16.

[0053] In addition, the heat exchange fresh air fan of the embodiment of the present application sets the inspection port 101b on the bottom wall 101a of the shell 101, which is convenient for inspecting the heat exchange core 11 and the electric control box 16 and can also avoid damaging the user's decoration style as much as possible.

[0054] In one embodiment, please refer to Figure 3 and Figure 4 The projection of the outer shape of the heat exchange core 11 in the height direction perpendicular to the shell 101 is a quadrilateral.

[0055] The projection of the heat exchange core in the related art in the height direction perpendicular to the shell is generally hexagonal. The outer dimensions of this heat exchange core are large and difficult to install. The size of the inspection port corresponding to the heat exchange core is also relatively large, which can easily destroy the user's decoration style.

[0056] The outer shape of the heat exchange core 11 of one embodiment of the present application is projected into a quadrilateral in the height direction perpendicular to the outer shell 101. The outer size of the heat exchange core 11 projected into a quadrilateral is relatively small, easy to install, and can reduce the size of the inspection port 101b. Therefore, the impact of the inspection port 101b on the user's decoration style can be minimized as much as possible, so that the appearance of the heat exchange fresh air fan is more beautiful.

[0057] In one embodiment, please refer to Figure 3 and Figure 4 The projection of the heat exchange core 11 in the height direction perpendicular to the outer shell 101 is a square. Compared with quadrilaterals of other shapes projected as squares, the heat exchange core 11 projected as a square in the height direction perpendicular to the outer shell 101 occupies relatively less space, which is not only easier to install, but also can further reduce the size of the inspection port 101b.

[0058] In some embodiments, the projection of the outer shape of the heat exchange core in the height direction perpendicular to the shell may also be a rectangle, a diamond, etc.

[0059] In one embodiment, the heat exchange pipe in the heat exchange core is wavy, thereby enabling the return air in the return air channel and the fresh air in the fresh air channel to undergo more sufficient heat exchange in the heat exchange core.

[0060] In one embodiment, please refer to Figure 4 and Figure 10 The heat exchange fresh air fan also includes a mounting bracket 12 having a guide rail 12a. The mounting bracket 12 is arranged in the shell 101 and is located at the inspection port 101b. The guide rail 12a extends toward the inspection port 101b. The heat exchange core 11 is detachably arranged on the mounting bracket 12 and slides with the guide rail 12a, thereby facilitating the disassembly and assembly of the heat exchange core 11.

[0061] In one embodiment, the heat exchange fresh air blower further includes a limiting portion (not shown), which is movably disposed on the mounting bracket 12 to block or avoid the heat exchange core 11 at the inspection port 101b.

[0062] Specifically, the limiting portion is movably connected to the mounting bracket 12, and the limiting portion can be moved to the bottom of the heat exchange core 11 or completely away from the bottom of the heat exchange core 11; when the limiting portion moves to the bottom of the heat exchange core 11, it can block the heat exchange core 11 to prevent the heat exchange core 11 from falling from the inspection port 101b after the inspection cover 102 is opened; when the limiting portion moves to the position completely away from the bottom of the heat exchange core 11, the heat exchange core 11 can be taken out from the inspection port 101b.

[0063] In one embodiment, please refer to Figure 4 , the electric control box 16 is arranged in the return air channel.

[0064] Since the indoor temperature is relatively stable, placing the electric control box 16 in the return air duct can avoid condensation caused by a large temperature difference between the outdoor and indoor temperature, and effectively prevent condensed water from entering the electric control box 16 and damaging it.

[0065] In some embodiments, the electrical control box 16 may also be disposed in the fresh air duct and between the fresh air outlet 101g and the heat exchange core 11. Since the fresh air entering the fresh air duct from the fresh air inlet 101f undergoes heat exchange with the return air in the return air duct at the heat exchange core 11, the temperature difference between the region between the fresh air outlet 101g and the heat exchange core 11 and the room temperature after the fresh air undergoes heat exchange enters the region between the fresh air outlet 101g and the heat exchange core 11 of the fresh air duct will be relatively small. Therefore, disposing the electrical control box 16 in the fresh air duct and between the fresh air outlet 101g and the heat exchange core 11 can also effectively prevent condensed water from entering the electrical control box 16.

[0066] In one embodiment, please refer to Figure 4 、 Figures 9 to 12 The housing assembly 10 further includes a support assembly 17 disposed within the shell 101 , and the electric control box 16 is fastened to the support assembly 17 .

[0067] Specifically, the fastening connection described in this application mainly refers to a method of connection using fasteners such as screws and bolts. The support assembly 17 can be fixed in the housing 101 by welding, fastening, etc., or can be integrally formed with the housing 101. The electric control box 16 can be fixed in the housing 101 by fastening it to the support assembly 17. When it is necessary to inspect the electric control box 16, one only needs to reach into the housing 101 through the inspection port 101b and remove the fasteners securing the electric control box 16. The electric control box 16 can then be removed from the inspection port 101b, which is simple and convenient to operate.

[0068] In one embodiment, please refer to Figures 9 to 12 The electric control box 16 includes a box body 161 having a first plug-in portion 161a and an electric control component arranged on the box body 161. The support assembly 17 includes a first support member 171 and a second support member 172. The first support member 171 has a second plug-in portion 171a. The first plug-in portion 161a is plugged into the second plug-in portion 171a, and the box body 161 is firmly connected to the second support member 172.

[0069] When installing the electric control box 16, the electric control box 16 can be positioned by first using the first plug-in portion 161a on the box body 161 to plug and match with the second plug-in portion 171a on the first support member 171, so that the first fastening connection hole on the box body 161 for inserting the fastener can be quickly aligned with the second fastening connection hole on the second support member 172 through positioning, and then the fastener is inserted into the first fastening connection hole and the second fastening connection hole, so that the box body 161 can be fastened to the second support member 172. When the electric control box 16 needs to be inspected and repaired, it is only necessary to remove the fastener to remove the electric control box 16 from the support assembly 17, thereby improving the disassembly and assembly efficiency of the electric control box 16.

[0070] The first plug-in portion 161a on the box body 161 and the second plug-in portion 171a on the first support member 171 can have various structural forms. For example, in one embodiment, see Figures 9 to 12 The first plug-in portion 161a on the box body 161 is a latch, and the second plug-in portion 171a on the first support member 171 is a positioning card hole. When installing the electric control box 16, the latch is inserted into the positioning card hole to quickly position the electric control box 16.

[0071] In some embodiments, one of the first plug-in portion 161a and the second plug-in portion 171a may be a positioning block, and the other of the first plug-in portion 161a and the second plug-in portion 171a may be a positioning groove.

[0072] In one embodiment, please refer to Figures 9 to 12 The support assembly 17 is arranged on the side wall 101c of the shell 101, the box body 161 has a first flange 161b, the first flange 161b and the first plug-in portion 161a are respectively located on opposite sides of the box body 161 in the transverse direction, and the second support member 172 is a support plate having a second flange 172a; when the first plug-in portion 161a is plugged into the second plug-in portion 171a, the first flange 161b abuts against the second flange 172a and is firmly connected to the second flange 172a.

[0073] Specifically, when installing the electric control box 16, first plug the first plug-in portion 161a located on one lateral side of the box body 161 into engagement with the second plug-in portion 171a on the first support member 171, then place the first flange 161b on the other lateral side of the box body 161 against the second flange 172a of the second support member 172, so that the first fastening connection hole on the first flange 161b can be quickly aligned with the second fastening connection hole on the second support member 172, and then the fastener can be inserted into the first fastening connection hole and the second fastening connection hole. The operation is simple and convenient.

[0074] In one embodiment, please refer to Figure 4 、 Figure 7 and Figure 8 The heat exchange fresh air fan also includes a sensor assembly 13 detachably arranged adjacent to the inspection port 101b. The sensor assembly 13 is arranged in the return air channel and is located between the return air inlet 101d and the heat exchange core 11.

[0075] Specifically, the sensor assembly 13 can monitor indoor air quality to ensure that it meets standards. For example, if the sensor assembly 13 detects poor indoor air quality, the heat exchanger will increase the amount of fresh air entering to improve the indoor air quality. If the sensor assembly 13 detects good indoor air quality, the heat exchanger will appropriately reduce the amount of fresh air entering to maintain indoor temperature stability and reduce fan energy consumption.

[0076] Placing the sensor assembly 13 at a position adjacent to the inspection opening 101 b can also facilitate taking the sensor assembly 13 out of the inspection opening 101 b for inspection.

[0077] In one embodiment, please refer to Figure 7 and Figure 8 The sensor assembly 13 has a buckle 131 and a connecting portion 132. The heat exchange fresh air fan also includes a guide plate 14 and a positioning mounting plate 15 arranged on the side wall 101c of the shell 101. The guide plate 14 has a guide edge 14a formed by folding, and the positioning mounting plate 15 has a positioning notch 15a. The buckle 131 can be slidably clamped on the guide edge 14a, and the connecting portion 132 is clamped into the positioning notch 15a and is fastened to the positioning mounting plate 15.

[0078] Specifically, when installing the sensor assembly 13, it is only necessary to snap the buckle 131 on the sensor assembly 13 into the guide edge 14a on the guide plate 14, and then slide the sensor assembly 13 so that the connecting portion 132 can slide into the positioning notch 15a. When the connecting portion 132 is snapped into place in the positioning notch 15a, the third fastening connection hole on the connecting portion 132 can be quickly aligned with the fourth fastening connection hole on the positioning mounting plate 15, and then the fastener is passed through the third fastening connection hole and the fourth fastening connection hole to fasten the sensor assembly 13 to the positioning mounting plate 15. When the sensor assembly 13 needs to be inspected and repaired, it is only necessary to remove the fastener, and then the sensor assembly 13 can be removed from the guide plate 14 and the positioning mounting plate 15 by sliding the sensor assembly 13 in the opposite direction. The operation is simple and convenient, thereby improving the disassembly and assembly efficiency of the sensor assembly 13.

[0079] In one embodiment, please refer to Figure 3 and Figure 4 The heat exchange fresh air fan also includes a primary filter 21 detachably arranged at the inspection port 101b; a primary filter 21 is provided on the side of the heat exchange core 11 facing the return air inlet 101d.

[0080] Specifically, a primary filter 21 is provided on the side of the heat exchange core 11 facing the return air inlet 101d, which can filter out large particles of dust in the indoor return air before it enters the heat exchange core 11 through the return air channel, thereby preventing large particles of dust from clogging the heat exchange core 11 and affecting the performance of the heat exchange core 11.

[0081] The primary filter 21 located on the side of the heat exchange core 11 facing the return air inlet 101d is detachably arranged at the inspection port 101b, and the primary filter 21 can also be conveniently removed for cleaning or inspection.

[0082] In one embodiment, please refer to Figure 4 A primary filter 21 may also be provided on the side of the heat exchange core 11 facing the fresh air inlet 101f.

[0083] Specifically, a primary filter 21 is provided on the side of the heat exchange core 11 facing the fresh air inlet 101f, which can filter out large particles of dust in the outdoor fresh air before it enters the heat exchange core 11 through the fresh air channel, thereby preventing large particles of dust from clogging the heat exchange core 11 and affecting the performance of the heat exchange core 11.

[0084] The primary filter 21 located on the side of the heat exchange core 11 facing the fresh air inlet 101f is detachably arranged at the inspection port 101b, and the primary filter 21 can also be conveniently removed for cleaning or inspection.

[0085] In one embodiment, please refer to Figure 4 The heat exchange fresh air fan also includes a high-efficiency filter 22, which is detachably arranged in the fresh air channel and located at the inspection port 101b.

[0086] Specifically, the high-efficiency filter 22 can be used to filter fine particles in the outdoor fresh air, such as fine particles within PM0.3. The high-efficiency filter 22 can be used alone or in conjunction with the primary filter 21. When used alone, the high-efficiency filter 22 can be set on the side of the heat exchange core 11 facing the fresh air inlet 101f. When used in conjunction with the primary filter 21, the high-efficiency filter 22 can be set on the side of the heat exchange core 11 facing the fresh air outlet 101g (for example, Figure 4 The high-efficiency filter 22 can also be arranged on the side of the heat exchange core 11 facing the fresh air inlet 101f and between the primary filter 21 and the heat exchange core 11.

[0087] The high-efficiency filter 22 is detachably arranged at the inspection port 101b, and the high-efficiency filter 22 can be conveniently removed for cleaning or inspection.

[0088] In one embodiment, please refer to Figures 4 to 6The return air duct, located upstream of the heat exchange core 11 along the airflow direction, communicates with the fresh air duct, located upstream of the heat exchange core 11 along the airflow direction, forming an internal circulation channel through the heat exchange core 11 between the return air inlet 101d and the fresh air outlet 101g. The heat exchange fresh air fan also includes a first damper assembly 19 and a second damper assembly 20. The first damper assembly 19 can selectively open or close the internal circulation channel, while the second damper assembly 20 can selectively open or close the fresh air inlet 101f. The cooperation of the first damper assembly 19 and the second damper assembly 20 enables the heat exchange fresh air fan to have multiple functions.

[0089] Specifically, see Figure 4 When the heat exchange fresh air fan is in full heat exchange mode, the first air valve assembly 19 closes the internal circulation channel, and the second air valve assembly 20 opens the fresh air inlet 101f. The outdoor fresh air enters the fresh air channel from the fresh air inlet 101f, and the indoor return air enters the return air channel from the return air inlet 101d. After the fresh air in the fresh air channel and the return air in the return air channel undergo heat exchange at the heat exchange core 11, the fresh air enters the room from the fresh air outlet 101g, and the return air is discharged to the outside from the return air outlet 101e.

[0090] See also Figure 5 When the heat exchange fresh air fan is in the internal circulation exhaust mode, the first air valve assembly 19 opens the internal circulation channel, and the second air valve assembly 20 closes the fresh air inlet 101f. After the fresh air inlet 101f is closed, on the one hand, it can prevent the fresh air with a low outdoor temperature from entering the housing 101 and forming condensation, thereby improving the cold resistance of the heat exchange fresh air fan, so that the heat exchange fresh air fan can operate normally even in an environment with a temperature of -30°. On the other hand, after the indoor return air enters the return air inlet 101d, a portion of the return air enters the internal circulation channel and is purified in the internal circulation channel before entering the room through the fresh air outlet 101g, thereby purifying the indoor air, while the other portion of the return air is discharged to the outside through the return air channel. During the process of the return air being discharged to the outside through the return air channel, a small amount of fresh air from the outside can also enter the room through the return air channel, thereby adjusting the concentration of carbon dioxide in the room, keeping the indoor air fresh and not feeling stuffy.

[0091] See also Figure 6When the heat exchange fresh air fan is in mixed air mode, the first air valve assembly 19 conducts the internal circulation channel, and the second air valve assembly 20 opens the fresh air inlet 101f. In mixed air mode, the outdoor fresh air enters the fresh air channel from the fresh air inlet 101f. After the indoor return air enters the return air inlet 101d, a portion of the return air enters the internal circulation channel. Since the internal circulation channel and the fresh air channel partially overlap, the relatively high temperature return air entering the internal circulation channel will mix with the relatively low temperature outdoor fresh air and preheat the fresh air. As a result, the fresh air will not cause condensation or ice after entering the heat exchange core 11 due to overcooling, thereby avoiding condensation or ice blocking the heat exchange core 11 and reducing the exchange performance of the heat exchange core 11. In mixed air mode, the heat exchange fresh air fan can normally introduce fresh air even in an environment with a temperature of -20°.

[0092] In one embodiment, please refer to Figure 4 The first air valve assembly 19 and the second air valve assembly 20 are respectively detachably arranged at positions adjacent to the inspection port 101b, that is, the first air valve assembly 19 and the second air valve assembly 20 can also be taken out from the inspection port 101b for inspection.

[0093] In one embodiment, please refer to Figure 4 、 Figure 13 and Figure 14 The heat exchange fresh air fan includes a fan assembly 18, which is respectively provided at the fresh air outlet 101g and the return air outlet 101e. The fan assembly 18 includes a volute 181, fan blades 182, a drive motor 183, a first bracket 184, a shock-absorbing pad 185, and a second bracket 186. The shock-absorbing pad 185 is sandwiched between the first bracket 184 and the second bracket 186, and the shock-absorbing pad 185, the first bracket 184, and the second bracket 186 are interconnected. The volute 181 is connected to the second bracket 186, the fan blades 182 are provided in the volute 181, and the drive motor 183 is provided on the first bracket 184 and is drive-connected to the fan blades 182. The provision of the shock-absorbing pad 185 in the fan assembly 18 can change the natural frequency of the fan assembly 18, preventing the heat exchange fresh air fan from generating resonance, thereby reducing the vibration noise of the heat exchange fresh air fan.

[0094] In one embodiment, the volute 181 is an injection molded part, and the first bracket 184 and the second bracket 186 are sheet metal parts. Setting the first bracket 184 and the second bracket 186 as sheet metal parts can reduce the mold opening cost of the injection molded part and improve production efficiency.

[0095] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0096] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A heat exchange fresh air fan, characterized in that: include: heat exchange core; A shell assembly, the shell assembly comprising a shell and an inspection cover, the shell having an inspection opening on the bottom wall, a return air inlet and a fresh air outlet on the side wall of one side of the shell, and a fresh air inlet and a return air outlet on the side wall opposite to the shell, the heat exchange core being detachably disposed within the shell and located at the inspection opening, a return air passage passing through the heat exchange core being formed between the return air inlet and the return air outlet, a fresh air passage passing through the heat exchange core being formed between the fresh air inlet and the fresh air outlet, and the inspection cover being disposed at the inspection opening to selectively open or close the inspection opening; an electric control box, the electric control box being detachably disposed in the housing and adjacent to the inspection port, and the electric control box being removable from the inspection port after the heat exchange core is removed from the inspection port; A sensor assembly is detachably arranged adjacent to the inspection port, and the sensor assembly is arranged in the return air duct and between the return air inlet and the heat exchange core; the sensor assembly has a snap and a connecting portion, and the heat exchange fresh air fan also includes a guide plate and a positioning mounting plate arranged on the side wall of the shell, the guide plate has a guide edge formed by folding, and the positioning mounting plate has a positioning notch, the snap can be slidably engaged with the guide edge, and the connecting portion is snap-fitted with the positioning notch and is fastened to the positioning mounting plate.

2. The heat exchange fresh air blower according to claim 1, characterized in that: The electric control box is arranged in the return air channel; or, The electric control box is arranged in the fresh air channel and located between the fresh air outlet and the heat exchange core.

3. The heat exchange fresh air blower according to claim 1, characterized in that: The housing assembly further includes a support assembly disposed within the shell, and the electric control box is fastened to the support assembly.

4. The heat exchange fresh air blower according to claim 3, characterized in that: The electric control box includes a box body with a first plug-in portion and an electric control element arranged on the box body. The support assembly includes a first support member and a second support member. The first support member has a second plug-in portion. The first plug-in portion is plugged into and matched with the second plug-in portion. The box body is firmly connected to the second support member.

5. The heat exchange fresh air blower according to claim 4, characterized in that: The support assembly is arranged on the side wall of the shell, the box body has a first flange, the first flange and the first plug-in portion are respectively located on opposite sides of the box body in the transverse direction, and the second support member is a support plate having a second flange; When the first plug-in portion is plugged into and matched with the second plug-in portion, the first flange abuts against the second flange and is firmly connected to the second flange.

6. The heat exchange fresh air blower according to claim 1, characterized in that: The heat exchange fresh air fan further includes a primary filter detachably arranged at the inspection port; The primary filter is provided on the side of the heat exchange core facing the return air inlet; and / or, The primary filter is provided on a side of the heat exchange core facing the fresh air inlet.

7. The heat exchange fresh air blower according to claim 1, characterized in that: The heat exchange fresh air fan also includes a high-efficiency filter, which is detachably arranged in the fresh air channel and located at the inspection port.

8. The heat exchange fresh air blower according to claim 1, characterized in that: The return air channel is located in an upstream area of ​​the heat exchange core along the air flow direction and is connected to the fresh air channel in an upstream area of ​​the heat exchange core along the air flow direction, so that an internal circulation channel passing through the heat exchange core is formed between the return air inlet and the fresh air outlet; The heat exchange fresh air fan also includes a first air valve assembly and a second air valve assembly. The first air valve assembly can selectively open or close the internal circulation channel, and the second air valve assembly can selectively open or close the fresh air inlet.

9. The heat exchange fresh air blower according to claim 8, characterized in that: When the heat exchange fresh air fan is in full heat exchange mode, the first air valve assembly closes the internal circulation channel, and the second air valve assembly opens the fresh air inlet; When the heat exchange fresh air fan is in the internal circulation exhaust mode, the first air valve assembly opens the internal circulation channel, and the second air valve assembly closes the fresh air inlet; When the heat exchange fresh air fan is in the mixed air mode, the first air valve assembly connects the internal circulation channel, and the second air valve assembly opens the fresh air inlet.

10. The heat exchange fresh air blower according to claim 9, characterized in that: The first damper assembly and the second damper assembly are respectively detachably arranged at positions adjacent to the inspection port.

11. The heat exchange fresh air blower according to claim 1, characterized in that: The heat exchange fresh air fan includes a fan assembly, and the fan assembly is respectively provided at the fresh air outlet and the return air outlet; The fan assembly includes a volute, a fan blade, a drive motor, a first bracket, a shock-absorbing pad and a second bracket. The shock-absorbing pad is clamped between the first bracket and the second bracket, and the shock-absorbing pad, the first bracket and the second bracket are connected to each other. The volute is connected to the second bracket, the fan blade is arranged in the volute, and the drive motor is arranged on the first bracket and is driven and connected to the fan blade.

12. The heat exchange fresh air blower according to claim 11, characterized in that: The volute is an injection-molded part, and the first bracket and the second bracket are sheet metal parts.

13. The heat exchange fresh air blower according to claim 1, characterized in that: The projection of the outer shape of the heat exchange core in a height direction perpendicular to the shell is a quadrilateral.

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